lavc/aacsbr: fix make checkheaders warning
[ffmpeg.git] / libavcodec / h263.c
index 67a7f18..bc5c0d5 100644 (file)
@@ -1,14 +1,10 @@
 /*
- * H263/MPEG4 backend for ffmpeg encoder and decoder
+ * H.263/MPEG-4 backend for encoder and decoder
  * Copyright (c) 2000,2001 Fabrice Bellard
- * H263+ support.
+ * H.263+ support.
  * Copyright (c) 2001 Juan J. Sierralta P
  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
  *
- * ac prediction encoding, B-frame support, error resilience, optimizations,
- * qpel decoding, gmc decoding, interlaced decoding
- * by Michael Niedermayer <michaelni@gmx.at>
- *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  */
 
 /**
- * @file libavcodec/h263.c
- * h263/mpeg4 codec.
+ * @file
+ * H.263/MPEG-4 codec.
  */
 
-//#define DEBUG
 #include <limits.h>
 
-#include "dsputil.h"
 #include "avcodec.h"
 #include "mpegvideo.h"
+#include "h263.h"
 #include "h263data.h"
-#include "mpeg4data.h"
 #include "mathops.h"
-#include "unary.h"
-
-//#undef NDEBUG
-//#include <assert.h>
-
-#define INTRA_MCBPC_VLC_BITS 6
-#define INTER_MCBPC_VLC_BITS 7
-#define CBPY_VLC_BITS 6
-#define MV_VLC_BITS 9
-#define DC_VLC_BITS 9
-#define SPRITE_TRAJ_VLC_BITS 6
-#define MB_TYPE_B_VLC_BITS 4
-#define TEX_VLC_BITS 9
-#define H263_MBTYPE_B_VLC_BITS 6
-#define CBPC_B_VLC_BITS 3
-
-#if CONFIG_ENCODERS
-static uint8_t uni_DCtab_lum_len[512];
-static uint8_t uni_DCtab_chrom_len[512];
-static uint16_t uni_DCtab_lum_bits[512];
-static uint16_t uni_DCtab_chrom_bits[512];
-
-static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
-static uint8_t fcode_tab[MAX_MV*2+1];
-static uint8_t umv_fcode_tab[MAX_MV*2+1];
-
-static uint32_t uni_mpeg4_intra_rl_bits[64*64*2*2];
-static uint8_t  uni_mpeg4_intra_rl_len [64*64*2*2];
-static uint32_t uni_mpeg4_inter_rl_bits[64*64*2*2];
-static uint8_t  uni_mpeg4_inter_rl_len [64*64*2*2];
-static uint8_t  uni_h263_intra_aic_rl_len [64*64*2*2];
-static uint8_t  uni_h263_inter_rl_len [64*64*2*2];
-//#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
-//#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
-#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
-
-/* mpeg4
-inter
-max level: 24/6
-max run: 53/63
-
-intra
-max level: 53/16
-max run: 29/41
-*/
-#endif
-
-static uint8_t static_rl_table_store[5][2][2*MAX_RUN + MAX_LEVEL + 3];
-
-#if 0 //3IV1 is quite rare and it slows things down a tiny bit
-#define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
-#else
-#define IS_3IV1 0
-#endif
-
-int h263_get_picture_format(int width, int height)
-{
-    if (width == 128 && height == 96)
-        return 1;
-    else if (width == 176 && height == 144)
-        return 2;
-    else if (width == 352 && height == 288)
-        return 3;
-    else if (width == 704 && height == 576)
-        return 4;
-    else if (width == 1408 && height == 1152)
-        return 5;
-    else
-        return 7;
-}
-
-static void show_pict_info(MpegEncContext *s){
-    av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s%s%s%s%s %d/%d\n",
-         s->qscale, av_get_pict_type_char(s->pict_type),
-         s->gb.size_in_bits, 1-s->no_rounding,
-         s->obmc ? " AP" : "",
-         s->umvplus ? " UMV" : "",
-         s->h263_long_vectors ? " LONG" : "",
-         s->h263_plus ? " +" : "",
-         s->h263_aic ? " AIC" : "",
-         s->alt_inter_vlc ? " AIV" : "",
-         s->modified_quant ? " MQ" : "",
-         s->loop_filter ? " LOOP" : "",
-         s->h263_slice_structured ? " SS" : "",
-         s->avctx->time_base.den, s->avctx->time_base.num
-    );
-}
-
-#if CONFIG_ENCODERS
-
-static void aspect_to_info(MpegEncContext * s, AVRational aspect){
-    int i;
-
-    if(aspect.num==0) aspect= (AVRational){1,1};
-
-    for(i=1; i<6; i++){
-        if(av_cmp_q(pixel_aspect[i], aspect) == 0){
-            s->aspect_ratio_info=i;
-            return;
-        }
-    }
-
-    s->aspect_ratio_info= FF_ASPECT_EXTENDED;
-}
-
-void ff_flv_encode_picture_header(MpegEncContext * s, int picture_number)
-{
-      int format;
-
-      align_put_bits(&s->pb);
-
-      put_bits(&s->pb, 17, 1);
-      put_bits(&s->pb, 5, (s->h263_flv-1)); /* 0: h263 escape codes 1: 11-bit escape codes */
-      put_bits(&s->pb, 8, (((int64_t)s->picture_number * 30 * s->avctx->time_base.num) / //FIXME use timestamp
-                           s->avctx->time_base.den) & 0xff); /* TemporalReference */
-      if (s->width == 352 && s->height == 288)
-        format = 2;
-      else if (s->width == 176 && s->height == 144)
-        format = 3;
-      else if (s->width == 128 && s->height == 96)
-        format = 4;
-      else if (s->width == 320 && s->height == 240)
-        format = 5;
-      else if (s->width == 160 && s->height == 120)
-        format = 6;
-      else if (s->width <= 255 && s->height <= 255)
-        format = 0; /* use 1 byte width & height */
-      else
-        format = 1; /* use 2 bytes width & height */
-      put_bits(&s->pb, 3, format); /* PictureSize */
-      if (format == 0) {
-        put_bits(&s->pb, 8, s->width);
-        put_bits(&s->pb, 8, s->height);
-      } else if (format == 1) {
-        put_bits(&s->pb, 16, s->width);
-        put_bits(&s->pb, 16, s->height);
-      }
-      put_bits(&s->pb, 2, s->pict_type == FF_P_TYPE); /* PictureType */
-      put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */
-      put_bits(&s->pb, 5, s->qscale); /* Quantizer */
-      put_bits(&s->pb, 1, 0); /* ExtraInformation */
-
-      if(s->h263_aic){
-        s->y_dc_scale_table=
-          s->c_dc_scale_table= ff_aic_dc_scale_table;
-      }else{
-        s->y_dc_scale_table=
-          s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
-      }
-}
-
-void h263_encode_picture_header(MpegEncContext * s, int picture_number)
-{
-    int format, coded_frame_rate, coded_frame_rate_base, i, temp_ref;
-    int best_clock_code=1;
-    int best_divisor=60;
-    int best_error= INT_MAX;
-
-    if(s->h263_plus){
-        for(i=0; i<2; i++){
-            int div, error;
-            div= (s->avctx->time_base.num*1800000LL + 500LL*s->avctx->time_base.den) / ((1000LL+i)*s->avctx->time_base.den);
-            div= av_clip(div, 1, 127);
-            error= FFABS(s->avctx->time_base.num*1800000LL - (1000LL+i)*s->avctx->time_base.den*div);
-            if(error < best_error){
-                best_error= error;
-                best_divisor= div;
-                best_clock_code= i;
-            }
-        }
-    }
-    s->custom_pcf= best_clock_code!=1 || best_divisor!=60;
-    coded_frame_rate= 1800000;
-    coded_frame_rate_base= (1000+best_clock_code)*best_divisor;
-
-    align_put_bits(&s->pb);
-
-    /* Update the pointer to last GOB */
-    s->ptr_lastgob = put_bits_ptr(&s->pb);
-    put_bits(&s->pb, 22, 0x20); /* PSC */
-    temp_ref= s->picture_number * (int64_t)coded_frame_rate * s->avctx->time_base.num / //FIXME use timestamp
-                         (coded_frame_rate_base * (int64_t)s->avctx->time_base.den);
-    put_sbits(&s->pb, 8, temp_ref); /* TemporalReference */
-
-    put_bits(&s->pb, 1, 1);     /* marker */
-    put_bits(&s->pb, 1, 0);     /* h263 id */
-    put_bits(&s->pb, 1, 0);     /* split screen off */
-    put_bits(&s->pb, 1, 0);     /* camera  off */
-    put_bits(&s->pb, 1, 0);     /* freeze picture release off */
-
-    format = h263_get_picture_format(s->width, s->height);
-    if (!s->h263_plus) {
-        /* H.263v1 */
-        put_bits(&s->pb, 3, format);
-        put_bits(&s->pb, 1, (s->pict_type == FF_P_TYPE));
-        /* By now UMV IS DISABLED ON H.263v1, since the restrictions
-        of H.263v1 UMV implies to check the predicted MV after
-        calculation of the current MB to see if we're on the limits */
-        put_bits(&s->pb, 1, 0);         /* Unrestricted Motion Vector: off */
-        put_bits(&s->pb, 1, 0);         /* SAC: off */
-        put_bits(&s->pb, 1, s->obmc);   /* Advanced Prediction */
-        put_bits(&s->pb, 1, 0);         /* only I/P frames, no PB frame */
-        put_bits(&s->pb, 5, s->qscale);
-        put_bits(&s->pb, 1, 0);         /* Continuous Presence Multipoint mode: off */
-    } else {
-        int ufep=1;
-        /* H.263v2 */
-        /* H.263 Plus PTYPE */
-
-        put_bits(&s->pb, 3, 7);
-        put_bits(&s->pb,3,ufep); /* Update Full Extended PTYPE */
-        if (format == 7)
-            put_bits(&s->pb,3,6); /* Custom Source Format */
-        else
-            put_bits(&s->pb, 3, format);
-
-        put_bits(&s->pb,1, s->custom_pcf);
-        put_bits(&s->pb,1, s->umvplus); /* Unrestricted Motion Vector */
-        put_bits(&s->pb,1,0); /* SAC: off */
-        put_bits(&s->pb,1,s->obmc); /* Advanced Prediction Mode */
-        put_bits(&s->pb,1,s->h263_aic); /* Advanced Intra Coding */
-        put_bits(&s->pb,1,s->loop_filter); /* Deblocking Filter */
-        put_bits(&s->pb,1,s->h263_slice_structured); /* Slice Structured */
-        put_bits(&s->pb,1,0); /* Reference Picture Selection: off */
-        put_bits(&s->pb,1,0); /* Independent Segment Decoding: off */
-        put_bits(&s->pb,1,s->alt_inter_vlc); /* Alternative Inter VLC */
-        put_bits(&s->pb,1,s->modified_quant); /* Modified Quantization: */
-        put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
-        put_bits(&s->pb,3,0); /* Reserved */
-
-        put_bits(&s->pb, 3, s->pict_type == FF_P_TYPE);
-
-        put_bits(&s->pb,1,0); /* Reference Picture Resampling: off */
-        put_bits(&s->pb,1,0); /* Reduced-Resolution Update: off */
-        put_bits(&s->pb,1,s->no_rounding); /* Rounding Type */
-        put_bits(&s->pb,2,0); /* Reserved */
-        put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
-
-        /* This should be here if PLUSPTYPE */
-        put_bits(&s->pb, 1, 0); /* Continuous Presence Multipoint mode: off */
-
-                if (format == 7) {
-            /* Custom Picture Format (CPFMT) */
-            aspect_to_info(s, s->avctx->sample_aspect_ratio);
-
-            put_bits(&s->pb,4,s->aspect_ratio_info);
-            put_bits(&s->pb,9,(s->width >> 2) - 1);
-            put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
-            put_bits(&s->pb,9,(s->height >> 2));
-            if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
-                put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
-                put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
-            }
-        }
-        if(s->custom_pcf){
-            if(ufep){
-                put_bits(&s->pb, 1, best_clock_code);
-                put_bits(&s->pb, 7, best_divisor);
-            }
-            put_sbits(&s->pb, 2, temp_ref>>8);
-        }
-
-        /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
-        if (s->umvplus)
-//            put_bits(&s->pb,1,1); /* Limited according tables of Annex D */
-//FIXME check actual requested range
-            put_bits(&s->pb,2,1); /* unlimited */
-        if(s->h263_slice_structured)
-            put_bits(&s->pb,2,0); /* no weird submodes */
-
-        put_bits(&s->pb, 5, s->qscale);
-    }
-
-    put_bits(&s->pb, 1, 0);     /* no PEI */
-
-    if(s->h263_slice_structured){
-        put_bits(&s->pb, 1, 1);
-
-        assert(s->mb_x == 0 && s->mb_y == 0);
-        ff_h263_encode_mba(s);
-
-        put_bits(&s->pb, 1, 1);
-    }
-
-    if(s->h263_aic){
-         s->y_dc_scale_table=
-         s->c_dc_scale_table= ff_aic_dc_scale_table;
-    }else{
-        s->y_dc_scale_table=
-        s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
-    }
-}
-
-/**
- * Encodes a group of blocks header.
- */
-void h263_encode_gob_header(MpegEncContext * s, int mb_line)
-{
-    put_bits(&s->pb, 17, 1); /* GBSC */
-
-    if(s->h263_slice_structured){
-        put_bits(&s->pb, 1, 1);
-
-        ff_h263_encode_mba(s);
-
-        if(s->mb_num > 1583)
-            put_bits(&s->pb, 1, 1);
-        put_bits(&s->pb, 5, s->qscale); /* GQUANT */
-        put_bits(&s->pb, 1, 1);
-        put_bits(&s->pb, 2, s->pict_type == FF_I_TYPE); /* GFID */
-    }else{
-        int gob_number= mb_line / s->gob_index;
-
-        put_bits(&s->pb, 5, gob_number); /* GN */
-        put_bits(&s->pb, 2, s->pict_type == FF_I_TYPE); /* GFID */
-        put_bits(&s->pb, 5, s->qscale); /* GQUANT */
-    }
-}
-
-static inline int get_block_rate(MpegEncContext * s, DCTELEM block[64], int block_last_index, uint8_t scantable[64]){
-    int last=0;
-    int j;
-    int rate=0;
-
-    for(j=1; j<=block_last_index; j++){
-        const int index= scantable[j];
-        int level= block[index];
-        if(level){
-            level+= 64;
-            if((level&(~127)) == 0){
-                if(j<block_last_index) rate+= s->intra_ac_vlc_length     [UNI_AC_ENC_INDEX(j-last-1, level)];
-                else                   rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
-            }else
-                rate += s->ac_esc_length;
-
-            last= j;
-        }
-    }
-
-    return rate;
-}
-
-static inline int decide_ac_pred(MpegEncContext * s, DCTELEM block[6][64], int dir[6], uint8_t *st[6], int zigzag_last_index[6])
-{
-    int score= 0;
-    int i, n;
-    int8_t * const qscale_table= s->current_picture.qscale_table;
-
-    memcpy(zigzag_last_index, s->block_last_index, sizeof(int)*6);
-
-    for(n=0; n<6; n++){
-        int16_t *ac_val, *ac_val1;
-
-        score -= get_block_rate(s, block[n], s->block_last_index[n], s->intra_scantable.permutated);
-
-        ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
-        ac_val1= ac_val;
-        if(dir[n]){
-            const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
-            /* top prediction */
-            ac_val-= s->block_wrap[n]*16;
-            if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
-                /* same qscale */
-                for(i=1; i<8; i++){
-                    const int level= block[n][s->dsp.idct_permutation[i   ]];
-                    block[n][s->dsp.idct_permutation[i   ]] = level - ac_val[i+8];
-                    ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
-                    ac_val1[i+8]= level;
-                }
-            }else{
-                /* different qscale, we must rescale */
-                for(i=1; i<8; i++){
-                    const int level= block[n][s->dsp.idct_permutation[i   ]];
-                    block[n][s->dsp.idct_permutation[i   ]] = level - ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
-                    ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
-                    ac_val1[i+8]= level;
-                }
-            }
-            st[n]= s->intra_h_scantable.permutated;
-        }else{
-            const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
-            /* left prediction */
-            ac_val-= 16;
-            if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
-                /* same qscale */
-                for(i=1; i<8; i++){
-                    const int level= block[n][s->dsp.idct_permutation[i<<3]];
-                    block[n][s->dsp.idct_permutation[i<<3]]= level - ac_val[i];
-                    ac_val1[i  ]= level;
-                    ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
-                }
-            }else{
-                /* different qscale, we must rescale */
-                for(i=1; i<8; i++){
-                    const int level= block[n][s->dsp.idct_permutation[i<<3]];
-                    block[n][s->dsp.idct_permutation[i<<3]]= level - ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
-                    ac_val1[i  ]= level;
-                    ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
-                }
-            }
-            st[n]= s->intra_v_scantable.permutated;
-        }
-
-        for(i=63; i>0; i--) //FIXME optimize
-            if(block[n][ st[n][i] ]) break;
-        s->block_last_index[n]= i;
-
-        score += get_block_rate(s, block[n], s->block_last_index[n], st[n]);
-    }
-
-    return score < 0;
-}
-
-static inline void restore_ac_coeffs(MpegEncContext * s, DCTELEM block[6][64], int dir[6], uint8_t *st[6], int zigzag_last_index[6])
-{
-    int i, n;
-    memcpy(s->block_last_index, zigzag_last_index, sizeof(int)*6);
-
-    for(n=0; n<6; n++){
-        int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
-
-        st[n]= s->intra_scantable.permutated;
-        if(dir[n]){
-            /* top prediction */
-            for(i=1; i<8; i++){
-                block[n][s->dsp.idct_permutation[i   ]] = ac_val[i+8];
-            }
-        }else{
-            /* left prediction */
-            for(i=1; i<8; i++){
-                block[n][s->dsp.idct_permutation[i<<3]]= ac_val[i  ];
-            }
-        }
-    }
-}
-
-/**
- * modify qscale so that encoding is acually possible in h263 (limit difference to -2..2)
- */
-void ff_clean_h263_qscales(MpegEncContext *s){
-    int i;
-    int8_t * const qscale_table= s->current_picture.qscale_table;
-
-    ff_init_qscale_tab(s);
-
-    for(i=1; i<s->mb_num; i++){
-        if(qscale_table[ s->mb_index2xy[i] ] - qscale_table[ s->mb_index2xy[i-1] ] >2)
-            qscale_table[ s->mb_index2xy[i] ]= qscale_table[ s->mb_index2xy[i-1] ]+2;
-    }
-    for(i=s->mb_num-2; i>=0; i--){
-        if(qscale_table[ s->mb_index2xy[i] ] - qscale_table[ s->mb_index2xy[i+1] ] >2)
-            qscale_table[ s->mb_index2xy[i] ]= qscale_table[ s->mb_index2xy[i+1] ]+2;
-    }
-
-    if(s->codec_id != CODEC_ID_H263P){
-        for(i=1; i<s->mb_num; i++){
-            int mb_xy= s->mb_index2xy[i];
-
-            if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTER4V)){
-                s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_INTER;
-            }
-        }
-    }
-}
-
-/**
- * modify mb_type & qscale so that encoding is acually possible in mpeg4
- */
-void ff_clean_mpeg4_qscales(MpegEncContext *s){
-    int i;
-    int8_t * const qscale_table= s->current_picture.qscale_table;
-
-    ff_clean_h263_qscales(s);
-
-    if(s->pict_type== FF_B_TYPE){
-        int odd=0;
-        /* ok, come on, this isn't funny anymore, there's more code for handling this mpeg4 mess than for the actual adaptive quantization */
-
-        for(i=0; i<s->mb_num; i++){
-            int mb_xy= s->mb_index2xy[i];
-            odd += qscale_table[mb_xy]&1;
-        }
-
-        if(2*odd > s->mb_num) odd=1;
-        else                  odd=0;
-
-        for(i=0; i<s->mb_num; i++){
-            int mb_xy= s->mb_index2xy[i];
-            if((qscale_table[mb_xy]&1) != odd)
-                qscale_table[mb_xy]++;
-            if(qscale_table[mb_xy] > 31)
-                qscale_table[mb_xy]= 31;
-        }
-
-        for(i=1; i<s->mb_num; i++){
-            int mb_xy= s->mb_index2xy[i];
-            if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_DIRECT)){
-                s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_BIDIR;
-            }
-        }
-    }
-}
-
-#endif //CONFIG_ENCODERS
-
-#define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
-#define tab_bias (tab_size/2)
+#include "mpegutils.h"
+#include "flv.h"
+#include "mpeg4video.h"
 
-void ff_mpeg4_init_direct_mv(MpegEncContext *s){
-    int i;
-    for(i=0; i<tab_size; i++){
-        s->direct_scale_mv[0][i] = (i-tab_bias)*s->pb_time/s->pp_time;
-        s->direct_scale_mv[1][i] = (i-tab_bias)*(s->pb_time-s->pp_time)/s->pp_time;
-    }
-}
-
-static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx, int my, int i){
-    int xy= s->block_index[i];
-    uint16_t time_pp= s->pp_time;
-    uint16_t time_pb= s->pb_time;
-    int p_mx, p_my;
-
-    p_mx= s->next_picture.motion_val[0][xy][0];
-    if((unsigned)(p_mx + tab_bias) < tab_size){
-        s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx;
-        s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
-                            : s->direct_scale_mv[1][p_mx + tab_bias];
-    }else{
-        s->mv[0][i][0] = p_mx*time_pb/time_pp + mx;
-        s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
-                            : p_mx*(time_pb - time_pp)/time_pp;
-    }
-    p_my= s->next_picture.motion_val[0][xy][1];
-    if((unsigned)(p_my + tab_bias) < tab_size){
-        s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my;
-        s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
-                            : s->direct_scale_mv[1][p_my + tab_bias];
-    }else{
-        s->mv[0][i][1] = p_my*time_pb/time_pp + my;
-        s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
-                            : p_my*(time_pb - time_pp)/time_pp;
-    }
-}
-
-#undef tab_size
-#undef tab_bias
-
-/**
- *
- * @return the mb_type
- */
-int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my){
-    const int mb_index= s->mb_x + s->mb_y*s->mb_stride;
-    const int colocated_mb_type= s->next_picture.mb_type[mb_index];
-    uint16_t time_pp;
-    uint16_t time_pb;
-    int i;
-
-    //FIXME avoid divides
-    // try special case with shifts for 1 and 3 B-frames?
-
-    if(IS_8X8(colocated_mb_type)){
-        s->mv_type = MV_TYPE_8X8;
-        for(i=0; i<4; i++){
-            ff_mpeg4_set_one_direct_mv(s, mx, my, i);
-        }
-        return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
-    } else if(IS_INTERLACED(colocated_mb_type)){
-        s->mv_type = MV_TYPE_FIELD;
-        for(i=0; i<2; i++){
-            int field_select= s->next_picture.ref_index[0][s->block_index[2*i]];
-            s->field_select[0][i]= field_select;
-            s->field_select[1][i]= i;
-            if(s->top_field_first){
-                time_pp= s->pp_field_time - field_select + i;
-                time_pb= s->pb_field_time - field_select + i;
-            }else{
-                time_pp= s->pp_field_time + field_select - i;
-                time_pb= s->pb_field_time + field_select - i;
-            }
-            s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0]*time_pb/time_pp + mx;
-            s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1]*time_pb/time_pp + my;
-            s->mv[1][i][0] = mx ? s->mv[0][i][0] - s->p_field_mv_table[i][0][mb_index][0]
-                                : s->p_field_mv_table[i][0][mb_index][0]*(time_pb - time_pp)/time_pp;
-            s->mv[1][i][1] = my ? s->mv[0][i][1] - s->p_field_mv_table[i][0][mb_index][1]
-                                : s->p_field_mv_table[i][0][mb_index][1]*(time_pb - time_pp)/time_pp;
-        }
-        return MB_TYPE_DIRECT2 | MB_TYPE_16x8 | MB_TYPE_L0L1 | MB_TYPE_INTERLACED;
-    }else{
-        ff_mpeg4_set_one_direct_mv(s, mx, my, 0);
-        s->mv[0][1][0] = s->mv[0][2][0] = s->mv[0][3][0] = s->mv[0][0][0];
-        s->mv[0][1][1] = s->mv[0][2][1] = s->mv[0][3][1] = s->mv[0][0][1];
-        s->mv[1][1][0] = s->mv[1][2][0] = s->mv[1][3][0] = s->mv[1][0][0];
-        s->mv[1][1][1] = s->mv[1][2][1] = s->mv[1][3][1] = s->mv[1][0][1];
-        if((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) || !s->quarter_sample)
-            s->mv_type= MV_TYPE_16X16;
-        else
-            s->mv_type= MV_TYPE_8X8;
-        return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1; //Note see prev line
-    }
-}
 
 void ff_h263_update_motion_val(MpegEncContext * s){
     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
@@ -648,7 +45,7 @@ void ff_h263_update_motion_val(MpegEncContext * s){
     const int wrap = s->b8_stride;
     const int xy = s->block_index[0];
 
-    s->current_picture.mbskip_table[mb_xy]= s->mb_skipped;
+    s->current_picture.mbskip_table[mb_xy] = s->mb_skipped;
 
     if(s->mv_type != MV_TYPE_8X8){
         int motion_x, motion_y;
@@ -667,1040 +64,184 @@ void ff_h263_update_motion_val(MpegEncContext * s){
                 s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0];
                 s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1];
             }
-            s->current_picture.ref_index[0][xy           ]=
-            s->current_picture.ref_index[0][xy        + 1]= s->field_select[0][0];
-            s->current_picture.ref_index[0][xy + wrap    ]=
-            s->current_picture.ref_index[0][xy + wrap + 1]= s->field_select[0][1];
+            s->current_picture.ref_index[0][4*mb_xy    ] =
+            s->current_picture.ref_index[0][4*mb_xy + 1] = s->field_select[0][0];
+            s->current_picture.ref_index[0][4*mb_xy + 2] =
+            s->current_picture.ref_index[0][4*mb_xy + 3] = s->field_select[0][1];
         }
 
         /* no update if 8X8 because it has been done during parsing */
-        s->current_picture.motion_val[0][xy][0] = motion_x;
-        s->current_picture.motion_val[0][xy][1] = motion_y;
-        s->current_picture.motion_val[0][xy + 1][0] = motion_x;
-        s->current_picture.motion_val[0][xy + 1][1] = motion_y;
-        s->current_picture.motion_val[0][xy + wrap][0] = motion_x;
-        s->current_picture.motion_val[0][xy + wrap][1] = motion_y;
+        s->current_picture.motion_val[0][xy][0]            = motion_x;
+        s->current_picture.motion_val[0][xy][1]            = motion_y;
+        s->current_picture.motion_val[0][xy + 1][0]        = motion_x;
+        s->current_picture.motion_val[0][xy + 1][1]        = motion_y;
+        s->current_picture.motion_val[0][xy + wrap][0]     = motion_x;
+        s->current_picture.motion_val[0][xy + wrap][1]     = motion_y;
         s->current_picture.motion_val[0][xy + 1 + wrap][0] = motion_x;
         s->current_picture.motion_val[0][xy + 1 + wrap][1] = motion_y;
     }
 
     if(s->encoding){ //FIXME encoding MUST be cleaned up
         if (s->mv_type == MV_TYPE_8X8)
-            s->current_picture.mb_type[mb_xy]= MB_TYPE_L0 | MB_TYPE_8x8;
+            s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_8x8;
         else if(s->mb_intra)
-            s->current_picture.mb_type[mb_xy]= MB_TYPE_INTRA;
+            s->current_picture.mb_type[mb_xy] = MB_TYPE_INTRA;
         else
-            s->current_picture.mb_type[mb_xy]= MB_TYPE_L0 | MB_TYPE_16x16;
+            s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_16x16;
     }
 }
 
-/**
- * predicts the dc.
- * encoding quantized level -> quantized diff
- * decoding quantized diff -> quantized level
- * @param n block index (0-3 are luma, 4-5 are chroma)
- * @param dir_ptr pointer to an integer where the prediction direction will be stored
- */
-static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
+int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
 {
-    int a, b, c, wrap, pred, scale, ret;
+    int x, y, wrap, a, c, pred_dc;
     int16_t *dc_val;
 
     /* find prediction */
     if (n < 4) {
-        scale = s->y_dc_scale;
+        x = 2 * s->mb_x + (n & 1);
+        y = 2 * s->mb_y + ((n & 2) >> 1);
+        wrap = s->b8_stride;
+        dc_val = s->dc_val[0];
     } else {
-        scale = s->c_dc_scale;
+        x = s->mb_x;
+        y = s->mb_y;
+        wrap = s->mb_stride;
+        dc_val = s->dc_val[n - 4 + 1];
     }
-    if(IS_3IV1)
-        scale= 8;
-
-    wrap= s->block_wrap[n];
-    dc_val = s->dc_val[0] + s->block_index[n];
-
     /* B C
      * A X
      */
-    a = dc_val[ - 1];
-    b = dc_val[ - 1 - wrap];
-    c = dc_val[ - wrap];
+    a = dc_val[(x - 1) + (y) * wrap];
+    c = dc_val[(x) + (y - 1) * wrap];
 
-    /* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
+    /* No prediction outside GOB boundary */
     if(s->first_slice_line && n!=3){
-        if(n!=2) b=c= 1024;
-        if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024;
-    }
-    if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){
-        if(n==0 || n==4 || n==5)
-            b=1024;
+        if(n!=2) c= 1024;
+        if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
     }
+    /* just DC prediction */
+    if (a != 1024 && c != 1024)
+        pred_dc = (a + c) >> 1;
+    else if (a != 1024)
+        pred_dc = a;
+    else
+        pred_dc = c;
 
-    if (abs(a - b) < abs(b - c)) {
-        pred = c;
-        *dir_ptr = 1; /* top */
-    } else {
-        pred = a;
-        *dir_ptr = 0; /* left */
-    }
     /* we assume pred is positive */
-    pred = FASTDIV((pred + (scale >> 1)), scale);
+    *dc_val_ptr = &dc_val[x + y * wrap];
+    return pred_dc;
+}
 
-    if(encoding){
-        ret = level - pred;
-    }else{
-        level += pred;
-        ret= level;
-        if(s->error_recognition>=3){
-            if(level<0){
-                av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
-                return -1;
-            }
-            if(level*scale > 2048 + scale){
-                av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
-                return -1;
-            }
-        }
-    }
-    level *=scale;
-    if(level&(~2047)){
-        if(level<0)
-            level=0;
-        else if(!(s->workaround_bugs&FF_BUG_DC_CLIP))
-            level=2047;
-    }
-    dc_val[0]= level;
+void ff_h263_loop_filter(MpegEncContext * s){
+    int qp_c;
+    const int linesize  = s->linesize;
+    const int uvlinesize= s->uvlinesize;
+    const int xy = s->mb_y * s->mb_stride + s->mb_x;
+    uint8_t *dest_y = s->dest[0];
+    uint8_t *dest_cb= s->dest[1];
+    uint8_t *dest_cr= s->dest[2];
 
-    return ret;
-}
+    /*
+       Diag Top
+       Left Center
+    */
+    if (!IS_SKIP(s->current_picture.mb_type[xy])) {
+        qp_c= s->qscale;
+        s->h263dsp.h263_v_loop_filter(dest_y + 8 * linesize,     linesize, qp_c);
+        s->h263dsp.h263_v_loop_filter(dest_y + 8 * linesize + 8, linesize, qp_c);
+    }else
+        qp_c= 0;
 
-#if CONFIG_ENCODERS
+    if(s->mb_y){
+        int qp_dt, qp_tt, qp_tc;
 
-/**
- * encodes the dc value.
- * @param n block index (0-3 are luma, 4-5 are chroma)
- */
-static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
-{
-#if 1
-    level+=256;
-    if (n < 4) {
-        /* luminance */
-        put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
-    } else {
-        /* chrominance */
-        put_bits(s, uni_DCtab_chrom_len[level], uni_DCtab_chrom_bits[level]);
-    }
-#else
-    int size, v;
-    /* find number of bits */
-    size = 0;
-    v = abs(level);
-    while (v) {
-        v >>= 1;
-        size++;
-    }
+        if (IS_SKIP(s->current_picture.mb_type[xy - s->mb_stride]))
+            qp_tt=0;
+        else
+            qp_tt = s->current_picture.qscale_table[xy - s->mb_stride];
 
-    if (n < 4) {
-        /* luminance */
-        put_bits(&s->pb, DCtab_lum[size][1], DCtab_lum[size][0]);
-    } else {
-        /* chrominance */
-        put_bits(&s->pb, DCtab_chrom[size][1], DCtab_chrom[size][0]);
-    }
+        if(qp_c)
+            qp_tc= qp_c;
+        else
+            qp_tc= qp_tt;
 
-    /* encode remaining bits */
-    if (size > 0) {
-        if (level < 0)
-            level = (-level) ^ ((1 << size) - 1);
-        put_bits(&s->pb, size, level);
-        if (size > 8)
-            put_bits(&s->pb, 1, 1);
-    }
-#endif
-}
+        if(qp_tc){
+            const int chroma_qp= s->chroma_qscale_table[qp_tc];
+            s->h263dsp.h263_v_loop_filter(dest_y,     linesize, qp_tc);
+            s->h263dsp.h263_v_loop_filter(dest_y + 8, linesize, qp_tc);
 
-static inline int mpeg4_get_dc_length(int level, int n){
-    if (n < 4) {
-        return uni_DCtab_lum_len[level + 256];
-    } else {
-        return uni_DCtab_chrom_len[level + 256];
-    }
-}
+            s->h263dsp.h263_v_loop_filter(dest_cb, uvlinesize, chroma_qp);
+            s->h263dsp.h263_v_loop_filter(dest_cr, uvlinesize, chroma_qp);
+        }
 
-/**
- * encodes a 8x8 block
- * @param n block index (0-3 are luma, 4-5 are chroma)
- */
-static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
-                               uint8_t *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
-{
-    int i, last_non_zero;
-#if 0 //variables for the outcommented version
-    int code, sign, last;
-#endif
-    const RLTable *rl;
-    uint32_t *bits_tab;
-    uint8_t *len_tab;
-    const int last_index = s->block_last_index[n];
+        if(qp_tt)
+            s->h263dsp.h263_h_loop_filter(dest_y - 8 * linesize + 8, linesize, qp_tt);
 
-    if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
-        /* mpeg4 based DC predictor */
-        mpeg4_encode_dc(dc_pb, intra_dc, n);
-        if(last_index<1) return;
-        i = 1;
-        rl = &rl_intra;
-        bits_tab= uni_mpeg4_intra_rl_bits;
-        len_tab = uni_mpeg4_intra_rl_len;
-    } else {
-        if(last_index<0) return;
-        i = 0;
-        rl = &rl_inter;
-        bits_tab= uni_mpeg4_inter_rl_bits;
-        len_tab = uni_mpeg4_inter_rl_len;
-    }
+        if(s->mb_x){
+            if (qp_tt || IS_SKIP(s->current_picture.mb_type[xy - 1 - s->mb_stride]))
+                qp_dt= qp_tt;
+            else
+                qp_dt = s->current_picture.qscale_table[xy - 1 - s->mb_stride];
 
-    /* AC coefs */
-    last_non_zero = i - 1;
-#if 1
-    for (; i < last_index; i++) {
-        int level = block[ scan_table[i] ];
-        if (level) {
-            int run = i - last_non_zero - 1;
-            level+=64;
-            if((level&(~127)) == 0){
-                const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
-                put_bits(ac_pb, len_tab[index], bits_tab[index]);
-            }else{ //ESC3
-                put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(0<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
-            }
-            last_non_zero = i;
-        }
-    }
-    /*if(i<=last_index)*/{
-        int level = block[ scan_table[i] ];
-        int run = i - last_non_zero - 1;
-        level+=64;
-        if((level&(~127)) == 0){
-            const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
-            put_bits(ac_pb, len_tab[index], bits_tab[index]);
-        }else{ //ESC3
-            put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(1<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
-        }
-    }
-#else
-    for (; i <= last_index; i++) {
-        const int slevel = block[ scan_table[i] ];
-        if (slevel) {
-            int level;
-            int run = i - last_non_zero - 1;
-            last = (i == last_index);
-            sign = 0;
-            level = slevel;
-            if (level < 0) {
-                sign = 1;
-                level = -level;
-            }
-            code = get_rl_index(rl, last, run, level);
-            put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
-            if (code == rl->n) {
-                int level1, run1;
-                level1 = level - rl->max_level[last][run];
-                if (level1 < 1)
-                    goto esc2;
-                code = get_rl_index(rl, last, run, level1);
-                if (code == rl->n) {
-                esc2:
-                    put_bits(ac_pb, 1, 1);
-                    if (level > MAX_LEVEL)
-                        goto esc3;
-                    run1 = run - rl->max_run[last][level] - 1;
-                    if (run1 < 0)
-                        goto esc3;
-                    code = get_rl_index(rl, last, run1, level);
-                    if (code == rl->n) {
-                    esc3:
-                        /* third escape */
-                        put_bits(ac_pb, 1, 1);
-                        put_bits(ac_pb, 1, last);
-                        put_bits(ac_pb, 6, run);
-                        put_bits(ac_pb, 1, 1);
-                        put_sbits(ac_pb, 12, slevel);
-                        put_bits(ac_pb, 1, 1);
-                    } else {
-                        /* second escape */
-                        put_bits(ac_pb, 1, 0);
-                        put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
-                        put_bits(ac_pb, 1, sign);
-                    }
-                } else {
-                    /* first escape */
-                    put_bits(ac_pb, 1, 0);
-                    put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
-                    put_bits(ac_pb, 1, sign);
-                }
-            } else {
-                put_bits(ac_pb, 1, sign);
-            }
-            last_non_zero = i;
-        }
-    }
-#endif
-}
-
-static int mpeg4_get_block_length(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
-                               uint8_t *scan_table)
-{
-    int i, last_non_zero;
-    uint8_t *len_tab;
-    const int last_index = s->block_last_index[n];
-    int len=0;
-
-    if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
-        /* mpeg4 based DC predictor */
-        len += mpeg4_get_dc_length(intra_dc, n);
-        if(last_index<1) return len;
-        i = 1;
-        len_tab = uni_mpeg4_intra_rl_len;
-    } else {
-        if(last_index<0) return 0;
-        i = 0;
-        len_tab = uni_mpeg4_inter_rl_len;
-    }
-
-    /* AC coefs */
-    last_non_zero = i - 1;
-    for (; i < last_index; i++) {
-        int level = block[ scan_table[i] ];
-        if (level) {
-            int run = i - last_non_zero - 1;
-            level+=64;
-            if((level&(~127)) == 0){
-                const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
-                len += len_tab[index];
-            }else{ //ESC3
-                len += 7+2+1+6+1+12+1;
-            }
-            last_non_zero = i;
-        }
-    }
-    /*if(i<=last_index)*/{
-        int level = block[ scan_table[i] ];
-        int run = i - last_non_zero - 1;
-        level+=64;
-        if((level&(~127)) == 0){
-            const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
-            len += len_tab[index];
-        }else{ //ESC3
-            len += 7+2+1+6+1+12+1;
-        }
-    }
-
-    return len;
-}
-
-static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
-    int l, bit_size, code;
-
-    if (val == 0) {
-        return mvtab[0][1];
-    } else {
-        bit_size = f_code - 1;
-        /* modulo encoding */
-        l= INT_BIT - 6 - bit_size;
-        val = (val<<l)>>l;
-        val--;
-        code = (val >> bit_size) + 1;
-
-        return mvtab[code][1] + 1 + bit_size;
-    }
-}
-
-static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
-    if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
-        skip_put_bits(&s->pb,
-            h263_get_motion_length(s, x, f_code)
-           +h263_get_motion_length(s, y, f_code));
-    }else{
-        ff_h263_encode_motion(s, x, f_code);
-        ff_h263_encode_motion(s, y, f_code);
-    }
-}
-
-static inline int get_p_cbp(MpegEncContext * s,
-                      DCTELEM block[6][64],
-                      int motion_x, int motion_y){
-    int cbp, i;
-
-    if(s->flags & CODEC_FLAG_CBP_RD){
-        int best_cbpy_score= INT_MAX;
-        int best_cbpc_score= INT_MAX;
-        int cbpc = (-1), cbpy= (-1);
-        const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
-        const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
-
-        for(i=0; i<4; i++){
-            int score= inter_MCBPC_bits[i + offset] * lambda;
-            if(i&1) score += s->coded_score[5];
-            if(i&2) score += s->coded_score[4];
-
-            if(score < best_cbpc_score){
-                best_cbpc_score= score;
-                cbpc= i;
-            }
-        }
-
-        for(i=0; i<16; i++){
-            int score= cbpy_tab[i ^ 0xF][1] * lambda;
-            if(i&1) score += s->coded_score[3];
-            if(i&2) score += s->coded_score[2];
-            if(i&4) score += s->coded_score[1];
-            if(i&8) score += s->coded_score[0];
-
-            if(score < best_cbpy_score){
-                best_cbpy_score= score;
-                cbpy= i;
-            }
-        }
-        cbp= cbpc + 4*cbpy;
-        if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
-            if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
-                cbp= 0;
-        }
-
-        for (i = 0; i < 6; i++) {
-            if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
-                s->block_last_index[i]= -1;
-                s->dsp.clear_block(s->block[i]);
-            }
-        }
-    }else{
-        cbp= 0;
-        for (i = 0; i < 6; i++) {
-            if (s->block_last_index[i] >= 0)
-                cbp |= 1 << (5 - i);
-        }
-    }
-    return cbp;
-}
-
-static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64],
-                            int motion_x, int motion_y, int mb_type){
-    int cbp=0, i;
-
-    if(s->flags & CODEC_FLAG_CBP_RD){
-        int score=0;
-        const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
-
-        for(i=0; i<6; i++){
-            if(s->coded_score[i] < 0){
-                score += s->coded_score[i];
-                cbp |= 1 << (5 - i);
-            }
-        }
-
-        if(cbp){
-            int zero_score= -6;
-            if ((motion_x | motion_y | s->dquant | mb_type) == 0){
-                zero_score-= 4; //2*MV + mb_type + cbp bit
-            }
-
-            zero_score*= lambda;
-            if(zero_score <= score){
-                cbp=0;
-            }
-        }
-
-        for (i = 0; i < 6; i++) {
-            if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
-                s->block_last_index[i]= -1;
-                s->dsp.clear_block(s->block[i]);
-            }
-        }
-    }else{
-        for (i = 0; i < 6; i++) {
-            if (s->block_last_index[i] >= 0)
-                cbp |= 1 << (5 - i);
-        }
-    }
-    return cbp;
-}
-
-static inline void mpeg4_encode_blocks(MpegEncContext * s, DCTELEM block[6][64], int intra_dc[6],
-                               uint8_t **scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb){
-    int i;
-
-    if(scan_table){
-        if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
-            for (i = 0; i < 6; i++) {
-                skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, intra_dc[i], scan_table[i]));
-            }
-        }else{
-            /* encode each block */
-            for (i = 0; i < 6; i++) {
-                mpeg4_encode_block(s, block[i], i, intra_dc[i], scan_table[i], dc_pb, ac_pb);
-            }
-        }
-    }else{
-        if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
-            for (i = 0; i < 6; i++) {
-                skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, 0, s->intra_scantable.permutated));
-            }
-        }else{
-            /* encode each block */
-            for (i = 0; i < 6; i++) {
-                mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, dc_pb, ac_pb);
+            if(qp_dt){
+                const int chroma_qp= s->chroma_qscale_table[qp_dt];
+                s->h263dsp.h263_h_loop_filter(dest_y  - 8 * linesize,   linesize,   qp_dt);
+                s->h263dsp.h263_h_loop_filter(dest_cb - 8 * uvlinesize, uvlinesize, chroma_qp);
+                s->h263dsp.h263_h_loop_filter(dest_cr - 8 * uvlinesize, uvlinesize, chroma_qp);
             }
         }
     }
-}
-
-static const int dquant_code[5]= {1,0,9,2,3};
-
-void mpeg4_encode_mb(MpegEncContext * s,
-                    DCTELEM block[6][64],
-                    int motion_x, int motion_y)
-{
-    int cbpc, cbpy, pred_x, pred_y;
-    PutBitContext * const pb2    = s->data_partitioning                         ? &s->pb2    : &s->pb;
-    PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=FF_B_TYPE ? &s->tex_pb : &s->pb;
-    PutBitContext * const dc_pb  = s->data_partitioning && s->pict_type!=FF_I_TYPE ? &s->pb2    : &s->pb;
-    const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
-
-    if (!s->mb_intra) {
-        int i, cbp;
-
-        if(s->pict_type==FF_B_TYPE){
-            static const int mb_type_table[8]= {-1, 3, 2, 1,-1,-1,-1, 0}; /* convert from mv_dir to type */
-            int mb_type=  mb_type_table[s->mv_dir];
-
-            if(s->mb_x==0){
-                for(i=0; i<2; i++){
-                    s->last_mv[i][0][0]=
-                    s->last_mv[i][0][1]=
-                    s->last_mv[i][1][0]=
-                    s->last_mv[i][1][1]= 0;
-                }
-            }
-
-            assert(s->dquant>=-2 && s->dquant<=2);
-            assert((s->dquant&1)==0);
-            assert(mb_type>=0);
-
-            /* nothing to do if this MB was skipped in the next P Frame */
-            if(s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]){ //FIXME avoid DCT & ...
-                s->skip_count++;
-                s->mv[0][0][0]=
-                s->mv[0][0][1]=
-                s->mv[1][0][0]=
-                s->mv[1][0][1]= 0;
-                s->mv_dir= MV_DIR_FORWARD; //doesn't matter
-                s->qscale -= s->dquant;
-//                s->mb_skipped=1;
-
-                return;
-            }
-
-            cbp= get_b_cbp(s, block, motion_x, motion_y, mb_type);
-
-            if ((cbp | motion_x | motion_y | mb_type) ==0) {
-                /* direct MB with MV={0,0} */
-                assert(s->dquant==0);
-
-                put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
-
-                if(interleaved_stats){
-                    s->misc_bits++;
-                    s->last_bits++;
-                }
-                s->skip_count++;
-                return;
-            }
-
-            put_bits(&s->pb, 1, 0);     /* mb coded modb1=0 */
-            put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ //FIXME merge
-            put_bits(&s->pb, mb_type+1, 1); // this table is so simple that we don't need it :)
-            if(cbp) put_bits(&s->pb, 6, cbp);
-
-            if(cbp && mb_type){
-                if(s->dquant)
-                    put_bits(&s->pb, 2, (s->dquant>>2)+3);
-                else
-                    put_bits(&s->pb, 1, 0);
-            }else
-                s->qscale -= s->dquant;
-
-            if(!s->progressive_sequence){
-                if(cbp)
-                    put_bits(&s->pb, 1, s->interlaced_dct);
-                if(mb_type) // not direct mode
-                    put_bits(&s->pb, 1, s->mv_type == MV_TYPE_FIELD);
-            }
-
-            if(interleaved_stats){
-                s->misc_bits+= get_bits_diff(s);
-            }
-
-            if(mb_type == 0){
-                assert(s->mv_dir & MV_DIRECT);
-                ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
-                s->b_count++;
-                s->f_count++;
-            }else{
-                assert(mb_type > 0 && mb_type < 4);
-                if(s->mv_type != MV_TYPE_FIELD){
-                    if(s->mv_dir & MV_DIR_FORWARD){
-                        ff_h263_encode_motion_vector(s, s->mv[0][0][0] - s->last_mv[0][0][0],
-                                                        s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
-                        s->last_mv[0][0][0]= s->last_mv[0][1][0]= s->mv[0][0][0];
-                        s->last_mv[0][0][1]= s->last_mv[0][1][1]= s->mv[0][0][1];
-                        s->f_count++;
-                    }
-                    if(s->mv_dir & MV_DIR_BACKWARD){
-                        ff_h263_encode_motion_vector(s, s->mv[1][0][0] - s->last_mv[1][0][0],
-                                                        s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
-                        s->last_mv[1][0][0]= s->last_mv[1][1][0]= s->mv[1][0][0];
-                        s->last_mv[1][0][1]= s->last_mv[1][1][1]= s->mv[1][0][1];
-                        s->b_count++;
-                    }
-                }else{
-                    if(s->mv_dir & MV_DIR_FORWARD){
-                        put_bits(&s->pb, 1, s->field_select[0][0]);
-                        put_bits(&s->pb, 1, s->field_select[0][1]);
-                    }
-                    if(s->mv_dir & MV_DIR_BACKWARD){
-                        put_bits(&s->pb, 1, s->field_select[1][0]);
-                        put_bits(&s->pb, 1, s->field_select[1][1]);
-                    }
-                    if(s->mv_dir & MV_DIR_FORWARD){
-                        for(i=0; i<2; i++){
-                            ff_h263_encode_motion_vector(s, s->mv[0][i][0] - s->last_mv[0][i][0]  ,
-                                                            s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
-                            s->last_mv[0][i][0]= s->mv[0][i][0];
-                            s->last_mv[0][i][1]= s->mv[0][i][1]*2;
-                        }
-                        s->f_count++;
-                    }
-                    if(s->mv_dir & MV_DIR_BACKWARD){
-                        for(i=0; i<2; i++){
-                            ff_h263_encode_motion_vector(s, s->mv[1][i][0] - s->last_mv[1][i][0]  ,
-                                                            s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
-                            s->last_mv[1][i][0]= s->mv[1][i][0];
-                            s->last_mv[1][i][1]= s->mv[1][i][1]*2;
-                        }
-                        s->b_count++;
-                    }
-                }
-            }
-
-            if(interleaved_stats){
-                s->mv_bits+= get_bits_diff(s);
-            }
-
-            mpeg4_encode_blocks(s, block, NULL, NULL, NULL, &s->pb);
-
-            if(interleaved_stats){
-                s->p_tex_bits+= get_bits_diff(s);
-            }
-
-        }else{ /* s->pict_type==FF_B_TYPE */
-            cbp= get_p_cbp(s, block, motion_x, motion_y);
-
-            if ((cbp | motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16) {
-                /* check if the B frames can skip it too, as we must skip it if we skip here
-                   why didn't they just compress the skip-mb bits instead of reusing them ?! */
-                if(s->max_b_frames>0){
-                    int i;
-                    int x,y, offset;
-                    uint8_t *p_pic;
-
-                    x= s->mb_x*16;
-                    y= s->mb_y*16;
-                    if(x+16 > s->width)  x= s->width-16;
-                    if(y+16 > s->height) y= s->height-16;
-
-                    offset= x + y*s->linesize;
-                    p_pic= s->new_picture.data[0] + offset;
-
-                    s->mb_skipped=1;
-                    for(i=0; i<s->max_b_frames; i++){
-                        uint8_t *b_pic;
-                        int diff;
-                        Picture *pic= s->reordered_input_picture[i+1];
-
-                        if(pic==NULL || pic->pict_type!=FF_B_TYPE) break;
-
-                        b_pic= pic->data[0] + offset;
-                        if(pic->type != FF_BUFFER_TYPE_SHARED)
-                            b_pic+= INPLACE_OFFSET;
-                        diff= s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
-                        if(diff>s->qscale*70){ //FIXME check that 70 is optimal
-                            s->mb_skipped=0;
-                            break;
-                        }
-                    }
-                }else
-                    s->mb_skipped=1;
-
-                if(s->mb_skipped==1){
-                    /* skip macroblock */
-                    put_bits(&s->pb, 1, 1);
-
-                    if(interleaved_stats){
-                        s->misc_bits++;
-                        s->last_bits++;
-                    }
-                    s->skip_count++;
-
-                    return;
-                }
-            }
-
-            put_bits(&s->pb, 1, 0);     /* mb coded */
-            cbpc = cbp & 3;
-            cbpy = cbp >> 2;
-            cbpy ^= 0xf;
-            if(s->mv_type==MV_TYPE_16X16){
-                if(s->dquant) cbpc+= 8;
-                put_bits(&s->pb,
-                        inter_MCBPC_bits[cbpc],
-                        inter_MCBPC_code[cbpc]);
-
-                put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
-                if(s->dquant)
-                    put_bits(pb2, 2, dquant_code[s->dquant+2]);
-
-                if(!s->progressive_sequence){
-                    if(cbp)
-                        put_bits(pb2, 1, s->interlaced_dct);
-                    put_bits(pb2, 1, 0);
-                }
-
-                if(interleaved_stats){
-                    s->misc_bits+= get_bits_diff(s);
-                }
-
-                /* motion vectors: 16x16 mode */
-                h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
-
-                ff_h263_encode_motion_vector(s, motion_x - pred_x,
-                                                motion_y - pred_y, s->f_code);
-            }else if(s->mv_type==MV_TYPE_FIELD){
-                if(s->dquant) cbpc+= 8;
-                put_bits(&s->pb,
-                        inter_MCBPC_bits[cbpc],
-                        inter_MCBPC_code[cbpc]);
 
-                put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
-                if(s->dquant)
-                    put_bits(pb2, 2, dquant_code[s->dquant+2]);
-
-                assert(!s->progressive_sequence);
-                if(cbp)
-                    put_bits(pb2, 1, s->interlaced_dct);
-                put_bits(pb2, 1, 1);
-
-                if(interleaved_stats){
-                    s->misc_bits+= get_bits_diff(s);
-                }
-
-                /* motion vectors: 16x8 interlaced mode */
-                h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
-                pred_y /=2;
-
-                put_bits(&s->pb, 1, s->field_select[0][0]);
-                put_bits(&s->pb, 1, s->field_select[0][1]);
-
-                ff_h263_encode_motion_vector(s, s->mv[0][0][0] - pred_x,
-                                                s->mv[0][0][1] - pred_y, s->f_code);
-                ff_h263_encode_motion_vector(s, s->mv[0][1][0] - pred_x,
-                                                s->mv[0][1][1] - pred_y, s->f_code);
-            }else{
-                assert(s->mv_type==MV_TYPE_8X8);
-                put_bits(&s->pb,
-                        inter_MCBPC_bits[cbpc+16],
-                        inter_MCBPC_code[cbpc+16]);
-                put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
-
-                if(!s->progressive_sequence){
-                    if(cbp)
-                        put_bits(pb2, 1, s->interlaced_dct);
-                }
-
-                if(interleaved_stats){
-                    s->misc_bits+= get_bits_diff(s);
-                }
-
-                for(i=0; i<4; i++){
-                    /* motion vectors: 8x8 mode*/
-                    h263_pred_motion(s, i, 0, &pred_x, &pred_y);
-
-                    ff_h263_encode_motion_vector(s, s->current_picture.motion_val[0][ s->block_index[i] ][0] - pred_x,
-                                                    s->current_picture.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
-                }
-            }
-
-            if(interleaved_stats){
-                s->mv_bits+= get_bits_diff(s);
-            }
-
-            mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
-
-            if(interleaved_stats){
-                s->p_tex_bits+= get_bits_diff(s);
-            }
-            s->f_count++;
-        }
-    } else {
-        int cbp;
-        int dc_diff[6];   //dc values with the dc prediction subtracted
-        int dir[6];  //prediction direction
-        int zigzag_last_index[6];
-        uint8_t *scan_table[6];
-        int i;
-
-        for(i=0; i<6; i++){
-            dc_diff[i]= ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
-        }
-
-        if(s->flags & CODEC_FLAG_AC_PRED){
-            s->ac_pred= decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
-            if(!s->ac_pred)
-                restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
-        }else{
-            for(i=0; i<6; i++)
-                scan_table[i]= s->intra_scantable.permutated;
-        }
-
-        /* compute cbp */
-        cbp = 0;
-        for (i = 0; i < 6; i++) {
-            if (s->block_last_index[i] >= 1)
-                cbp |= 1 << (5 - i);
-        }
-
-        cbpc = cbp & 3;
-        if (s->pict_type == FF_I_TYPE) {
-            if(s->dquant) cbpc+=4;
-            put_bits(&s->pb,
-                intra_MCBPC_bits[cbpc],
-                intra_MCBPC_code[cbpc]);
-        } else {
-            if(s->dquant) cbpc+=8;
-            put_bits(&s->pb, 1, 0);     /* mb coded */
-            put_bits(&s->pb,
-                inter_MCBPC_bits[cbpc + 4],
-                inter_MCBPC_code[cbpc + 4]);
-        }
-        put_bits(pb2, 1, s->ac_pred);
-        cbpy = cbp >> 2;
-        put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
-        if(s->dquant)
-            put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
-
-        if(!s->progressive_sequence){
-            put_bits(dc_pb, 1, s->interlaced_dct);
-        }
-
-        if(interleaved_stats){
-            s->misc_bits+= get_bits_diff(s);
-        }
-
-        mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
-
-        if(interleaved_stats){
-            s->i_tex_bits+= get_bits_diff(s);
-        }
-        s->i_count++;
-
-        /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
-        if(s->ac_pred)
-            restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
+    if(qp_c){
+        s->h263dsp.h263_h_loop_filter(dest_y + 8, linesize, qp_c);
+        if(s->mb_y + 1 == s->mb_height)
+            s->h263dsp.h263_h_loop_filter(dest_y + 8 * linesize + 8, linesize, qp_c);
     }
-}
-
-/**
- * encodes a 8x8 block.
- * @param block the 8x8 block
- * @param n block index (0-3 are luma, 4-5 are chroma)
- */
-static void h263_encode_block(MpegEncContext * s, DCTELEM * block, int n)
-{
-    int level, run, last, i, j, last_index, last_non_zero, sign, slevel, code;
-    RLTable *rl;
 
-    rl = &rl_inter;
-    if (s->mb_intra && !s->h263_aic) {
-        /* DC coef */
-        level = block[0];
-        /* 255 cannot be represented, so we clamp */
-        if (level > 254) {
-            level = 254;
-            block[0] = 254;
-        }
-        /* 0 cannot be represented also */
-        else if (level < 1) {
-            level = 1;
-            block[0] = 1;
-        }
-        if (level == 128) //FIXME check rv10
-            put_bits(&s->pb, 8, 0xff);
+    if(s->mb_x){
+        int qp_lc;
+        if (qp_c || IS_SKIP(s->current_picture.mb_type[xy - 1]))
+            qp_lc= qp_c;
         else
-            put_bits(&s->pb, 8, level);
-        i = 1;
-    } else {
-        i = 0;
-        if (s->h263_aic && s->mb_intra)
-            rl = &rl_intra_aic;
-
-        if(s->alt_inter_vlc && !s->mb_intra){
-            int aic_vlc_bits=0;
-            int inter_vlc_bits=0;
-            int wrong_pos=-1;
-            int aic_code;
-
-            last_index = s->block_last_index[n];
-            last_non_zero = i - 1;
-            for (; i <= last_index; i++) {
-                j = s->intra_scantable.permutated[i];
-                level = block[j];
-                if (level) {
-                    run = i - last_non_zero - 1;
-                    last = (i == last_index);
-
-                    if(level<0) level= -level;
-
-                    code = get_rl_index(rl, last, run, level);
-                    aic_code = get_rl_index(&rl_intra_aic, last, run, level);
-                    inter_vlc_bits += rl->table_vlc[code][1]+1;
-                    aic_vlc_bits   += rl_intra_aic.table_vlc[aic_code][1]+1;
-
-                    if (code == rl->n) {
-                        inter_vlc_bits += 1+6+8-1;
-                    }
-                    if (aic_code == rl_intra_aic.n) {
-                        aic_vlc_bits += 1+6+8-1;
-                        wrong_pos += run + 1;
-                    }else
-                        wrong_pos += wrong_run[aic_code];
-                    last_non_zero = i;
-                }
-            }
-            i = 0;
-            if(aic_vlc_bits < inter_vlc_bits && wrong_pos > 63)
-                rl = &rl_intra_aic;
-        }
-    }
-
-    /* AC coefs */
-    last_index = s->block_last_index[n];
-    last_non_zero = i - 1;
-    for (; i <= last_index; i++) {
-        j = s->intra_scantable.permutated[i];
-        level = block[j];
-        if (level) {
-            run = i - last_non_zero - 1;
-            last = (i == last_index);
-            sign = 0;
-            slevel = level;
-            if (level < 0) {
-                sign = 1;
-                level = -level;
-            }
-            code = get_rl_index(rl, last, run, level);
-            put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
-            if (code == rl->n) {
-              if(s->h263_flv <= 1){
-                put_bits(&s->pb, 1, last);
-                put_bits(&s->pb, 6, run);
-
-                assert(slevel != 0);
+            qp_lc = s->current_picture.qscale_table[xy - 1];
 
-                if(level < 128)
-                    put_sbits(&s->pb, 8, slevel);
-                else{
-                    put_bits(&s->pb, 8, 128);
-                    put_sbits(&s->pb, 5, slevel);
-                    put_sbits(&s->pb, 6, slevel>>5);
-                }
-              }else{
-                if(level < 64) { // 7-bit level
-                        put_bits(&s->pb, 1, 0);
-                        put_bits(&s->pb, 1, last);
-                        put_bits(&s->pb, 6, run);
-
-                        put_sbits(&s->pb, 7, slevel);
-                    } else {
-                        /* 11-bit level */
-                        put_bits(&s->pb, 1, 1);
-                        put_bits(&s->pb, 1, last);
-                        put_bits(&s->pb, 6, run);
-
-                        put_sbits(&s->pb, 11, slevel);
-                    }
-              }
-            } else {
-                put_bits(&s->pb, 1, sign);
+        if(qp_lc){
+            s->h263dsp.h263_h_loop_filter(dest_y, linesize, qp_lc);
+            if(s->mb_y + 1 == s->mb_height){
+                const int chroma_qp= s->chroma_qscale_table[qp_lc];
+                s->h263dsp.h263_h_loop_filter(dest_y + 8 * linesize, linesize, qp_lc);
+                s->h263dsp.h263_h_loop_filter(dest_cb, uvlinesize, chroma_qp);
+                s->h263dsp.h263_h_loop_filter(dest_cr, uvlinesize, chroma_qp);
             }
-            last_non_zero = i;
-        }
-    }
-}
-
-/* Encode MV differences on H.263+ with Unrestricted MV mode */
-static void h263p_encode_umotion(MpegEncContext * s, int val)
-{
-    short sval = 0;
-    short i = 0;
-    short n_bits = 0;
-    short temp_val;
-    int code = 0;
-    int tcode;
-
-    if ( val == 0)
-        put_bits(&s->pb, 1, 1);
-    else if (val == 1)
-        put_bits(&s->pb, 3, 0);
-    else if (val == -1)
-        put_bits(&s->pb, 3, 2);
-    else {
-
-        sval = ((val < 0) ? (short)(-val):(short)val);
-        temp_val = sval;
-
-        while (temp_val != 0) {
-            temp_val = temp_val >> 1;
-            n_bits++;
-        }
-
-        i = n_bits - 1;
-        while (i > 0) {
-            tcode = (sval & (1 << (i-1))) >> (i-1);
-            tcode = (tcode << 1) | 1;
-            code = (code << 2) | tcode;
-            i--;
         }
-        code = ((code << 1) | (val < 0)) << 1;
-        put_bits(&s->pb, (2*n_bits)+1, code);
     }
 }
 
-static int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
+void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n)
 {
-    int x, y, wrap, a, c, pred_dc;
-    int16_t *dc_val;
+    int x, y, wrap, a, c, pred_dc, scale, i;
+    int16_t *dc_val, *ac_val, *ac_val1;
 
     /* find prediction */
     if (n < 4) {
         x = 2 * s->mb_x + (n & 1);
-        y = 2 * s->mb_y + ((n & 2) >> 1);
+        y = 2 * s->mb_y + (n>> 1);
         wrap = s->b8_stride;
         dc_val = s->dc_val[0];
+        ac_val = s->ac_val[0][0];
+        scale = s->y_dc_scale;
     } else {
         x = s->mb_x;
         y = s->mb_y;
         wrap = s->mb_stride;
         dc_val = s->dc_val[n - 4 + 1];
+        ac_val = s->ac_val[n - 4 + 1][0];
+        scale = s->c_dc_scale;
     }
+
+    ac_val += ((y) * wrap + (x)) * 16;
+    ac_val1 = ac_val;
+
     /* B C
      * A X
      */
@@ -1712,364 +253,26 @@ static int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
         if(n!=2) c= 1024;
         if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
     }
-    /* just DC prediction */
-    if (a != 1024 && c != 1024)
-        pred_dc = (a + c) >> 1;
-    else if (a != 1024)
-        pred_dc = a;
-    else
-        pred_dc = c;
-
-    /* we assume pred is positive */
-    *dc_val_ptr = &dc_val[x + y * wrap];
-    return pred_dc;
-}
-
-void h263_encode_mb(MpegEncContext * s,
-                    DCTELEM block[6][64],
-                    int motion_x, int motion_y)
-{
-    int cbpc, cbpy, i, cbp, pred_x, pred_y;
-    int16_t pred_dc;
-    int16_t rec_intradc[6];
-    int16_t *dc_ptr[6];
-    const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1);
 
-    if (!s->mb_intra) {
-        /* compute cbp */
-        cbp= get_p_cbp(s, block, motion_x, motion_y);
-
-        if ((cbp | motion_x | motion_y | s->dquant | (s->mv_type - MV_TYPE_16X16)) == 0) {
-            /* skip macroblock */
-            put_bits(&s->pb, 1, 1);
-            if(interleaved_stats){
-                s->misc_bits++;
-                s->last_bits++;
-            }
-            s->skip_count++;
-
-            return;
-        }
-        put_bits(&s->pb, 1, 0);         /* mb coded */
-
-        cbpc = cbp & 3;
-        cbpy = cbp >> 2;
-        if(s->alt_inter_vlc==0 || cbpc!=3)
-            cbpy ^= 0xF;
-        if(s->dquant) cbpc+= 8;
-        if(s->mv_type==MV_TYPE_16X16){
-            put_bits(&s->pb,
-                    inter_MCBPC_bits[cbpc],
-                    inter_MCBPC_code[cbpc]);
-
-            put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
-            if(s->dquant)
-                put_bits(&s->pb, 2, dquant_code[s->dquant+2]);
-
-            if(interleaved_stats){
-                s->misc_bits+= get_bits_diff(s);
-            }
-
-            /* motion vectors: 16x16 mode */
-            h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
-
-            if (!s->umvplus) {
-                ff_h263_encode_motion_vector(s, motion_x - pred_x,
-                                                motion_y - pred_y, 1);
-            }
-            else {
-                h263p_encode_umotion(s, motion_x - pred_x);
-                h263p_encode_umotion(s, motion_y - pred_y);
-                if (((motion_x - pred_x) == 1) && ((motion_y - pred_y) == 1))
-                    /* To prevent Start Code emulation */
-                    put_bits(&s->pb,1,1);
-            }
-        }else{
-            put_bits(&s->pb,
-                    inter_MCBPC_bits[cbpc+16],
-                    inter_MCBPC_code[cbpc+16]);
-            put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
-            if(s->dquant)
-                put_bits(&s->pb, 2, dquant_code[s->dquant+2]);
-
-            if(interleaved_stats){
-                s->misc_bits+= get_bits_diff(s);
-            }
-
-            for(i=0; i<4; i++){
-                /* motion vectors: 8x8 mode*/
-                h263_pred_motion(s, i, 0, &pred_x, &pred_y);
-
-                motion_x= s->current_picture.motion_val[0][ s->block_index[i] ][0];
-                motion_y= s->current_picture.motion_val[0][ s->block_index[i] ][1];
-                if (!s->umvplus) {
-                    ff_h263_encode_motion_vector(s, motion_x - pred_x,
-                                                    motion_y - pred_y, 1);
-                }
-                else {
-                    h263p_encode_umotion(s, motion_x - pred_x);
-                    h263p_encode_umotion(s, motion_y - pred_y);
-                    if (((motion_x - pred_x) == 1) && ((motion_y - pred_y) == 1))
-                        /* To prevent Start Code emulation */
-                        put_bits(&s->pb,1,1);
-                }
-            }
-        }
-
-        if(interleaved_stats){
-            s->mv_bits+= get_bits_diff(s);
-        }
-    } else {
-        assert(s->mb_intra);
-
-        cbp = 0;
-        if (s->h263_aic) {
-            /* Predict DC */
-            for(i=0; i<6; i++) {
-                int16_t level = block[i][0];
-                int scale;
-
-                if(i<4) scale= s->y_dc_scale;
-                else    scale= s->c_dc_scale;
-
-                pred_dc = h263_pred_dc(s, i, &dc_ptr[i]);
-                level -= pred_dc;
-                /* Quant */
-                if (level >= 0)
-                    level = (level + (scale>>1))/scale;
-                else
-                    level = (level - (scale>>1))/scale;
-
-                /* AIC can change CBP */
-                if (level == 0 && s->block_last_index[i] == 0)
-                    s->block_last_index[i] = -1;
-
-                if(!s->modified_quant){
-                    if (level < -127)
-                        level = -127;
-                    else if (level > 127)
-                        level = 127;
-                }
-
-                block[i][0] = level;
-                /* Reconstruction */
-                rec_intradc[i] = scale*level + pred_dc;
-                /* Oddify */
-                rec_intradc[i] |= 1;
-                //if ((rec_intradc[i] % 2) == 0)
-                //    rec_intradc[i]++;
-                /* Clipping */
-                if (rec_intradc[i] < 0)
-                    rec_intradc[i] = 0;
-                else if (rec_intradc[i] > 2047)
-                    rec_intradc[i] = 2047;
-
-                /* Update AC/DC tables */
-                *dc_ptr[i] = rec_intradc[i];
-                if (s->block_last_index[i] >= 0)
-                    cbp |= 1 << (5 - i);
-            }
-        }else{
-            for(i=0; i<6; i++) {
-                /* compute cbp */
-                if (s->block_last_index[i] >= 1)
-                    cbp |= 1 << (5 - i);
-            }
-        }
-
-        cbpc = cbp & 3;
-        if (s->pict_type == FF_I_TYPE) {
-            if(s->dquant) cbpc+=4;
-            put_bits(&s->pb,
-                intra_MCBPC_bits[cbpc],
-                intra_MCBPC_code[cbpc]);
-        } else {
-            if(s->dquant) cbpc+=8;
-            put_bits(&s->pb, 1, 0);     /* mb coded */
-            put_bits(&s->pb,
-                inter_MCBPC_bits[cbpc + 4],
-                inter_MCBPC_code[cbpc + 4]);
-        }
-        if (s->h263_aic) {
-            /* XXX: currently, we do not try to use ac prediction */
-            put_bits(&s->pb, 1, 0);     /* no AC prediction */
-        }
-        cbpy = cbp >> 2;
-        put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
-        if(s->dquant)
-            put_bits(&s->pb, 2, dquant_code[s->dquant+2]);
-
-        if(interleaved_stats){
-            s->misc_bits+= get_bits_diff(s);
-        }
-    }
-
-    for(i=0; i<6; i++) {
-        /* encode each block */
-        h263_encode_block(s, block[i], i);
-
-        /* Update INTRADC for decoding */
-        if (s->h263_aic && s->mb_intra) {
-            block[i][0] = rec_intradc[i];
-
-        }
-    }
-
-    if(interleaved_stats){
-        if (!s->mb_intra) {
-            s->p_tex_bits+= get_bits_diff(s);
-            s->f_count++;
-        }else{
-            s->i_tex_bits+= get_bits_diff(s);
-            s->i_count++;
-        }
-    }
-}
-#endif
-
-void ff_h263_loop_filter(MpegEncContext * s){
-    int qp_c;
-    const int linesize  = s->linesize;
-    const int uvlinesize= s->uvlinesize;
-    const int xy = s->mb_y * s->mb_stride + s->mb_x;
-    uint8_t *dest_y = s->dest[0];
-    uint8_t *dest_cb= s->dest[1];
-    uint8_t *dest_cr= s->dest[2];
-
-//    if(s->pict_type==FF_B_TYPE && !s->readable) return;
-
-    /*
-       Diag Top
-       Left Center
-    */
-    if(!IS_SKIP(s->current_picture.mb_type[xy])){
-        qp_c= s->qscale;
-        s->dsp.h263_v_loop_filter(dest_y+8*linesize  , linesize, qp_c);
-        s->dsp.h263_v_loop_filter(dest_y+8*linesize+8, linesize, qp_c);
-    }else
-        qp_c= 0;
-
-    if(s->mb_y){
-        int qp_dt, qp_tt, qp_tc;
-
-        if(IS_SKIP(s->current_picture.mb_type[xy-s->mb_stride]))
-            qp_tt=0;
-        else
-            qp_tt= s->current_picture.qscale_table[xy-s->mb_stride];
-
-        if(qp_c)
-            qp_tc= qp_c;
-        else
-            qp_tc= qp_tt;
-
-        if(qp_tc){
-            const int chroma_qp= s->chroma_qscale_table[qp_tc];
-            s->dsp.h263_v_loop_filter(dest_y  ,   linesize, qp_tc);
-            s->dsp.h263_v_loop_filter(dest_y+8,   linesize, qp_tc);
-
-            s->dsp.h263_v_loop_filter(dest_cb , uvlinesize, chroma_qp);
-            s->dsp.h263_v_loop_filter(dest_cr , uvlinesize, chroma_qp);
-        }
-
-        if(qp_tt)
-            s->dsp.h263_h_loop_filter(dest_y-8*linesize+8  ,   linesize, qp_tt);
-
-        if(s->mb_x){
-            if(qp_tt || IS_SKIP(s->current_picture.mb_type[xy-1-s->mb_stride]))
-                qp_dt= qp_tt;
-            else
-                qp_dt= s->current_picture.qscale_table[xy-1-s->mb_stride];
-
-            if(qp_dt){
-                const int chroma_qp= s->chroma_qscale_table[qp_dt];
-                s->dsp.h263_h_loop_filter(dest_y -8*linesize  ,   linesize, qp_dt);
-                s->dsp.h263_h_loop_filter(dest_cb-8*uvlinesize, uvlinesize, chroma_qp);
-                s->dsp.h263_h_loop_filter(dest_cr-8*uvlinesize, uvlinesize, chroma_qp);
-            }
-        }
-    }
-
-    if(qp_c){
-        s->dsp.h263_h_loop_filter(dest_y +8,   linesize, qp_c);
-        if(s->mb_y + 1 == s->mb_height)
-            s->dsp.h263_h_loop_filter(dest_y+8*linesize+8,   linesize, qp_c);
-    }
-
-    if(s->mb_x){
-        int qp_lc;
-        if(qp_c || IS_SKIP(s->current_picture.mb_type[xy-1]))
-            qp_lc= qp_c;
-        else
-            qp_lc= s->current_picture.qscale_table[xy-1];
-
-        if(qp_lc){
-            s->dsp.h263_h_loop_filter(dest_y,   linesize, qp_lc);
-            if(s->mb_y + 1 == s->mb_height){
-                const int chroma_qp= s->chroma_qscale_table[qp_lc];
-                s->dsp.h263_h_loop_filter(dest_y +8*  linesize,   linesize, qp_lc);
-                s->dsp.h263_h_loop_filter(dest_cb             , uvlinesize, chroma_qp);
-                s->dsp.h263_h_loop_filter(dest_cr             , uvlinesize, chroma_qp);
-            }
-        }
-    }
-}
-
-static void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n)
-{
-    int x, y, wrap, a, c, pred_dc, scale, i;
-    int16_t *dc_val, *ac_val, *ac_val1;
-
-    /* find prediction */
-    if (n < 4) {
-        x = 2 * s->mb_x + (n & 1);
-        y = 2 * s->mb_y + (n>> 1);
-        wrap = s->b8_stride;
-        dc_val = s->dc_val[0];
-        ac_val = s->ac_val[0][0];
-        scale = s->y_dc_scale;
-    } else {
-        x = s->mb_x;
-        y = s->mb_y;
-        wrap = s->mb_stride;
-        dc_val = s->dc_val[n - 4 + 1];
-        ac_val = s->ac_val[n - 4 + 1][0];
-        scale = s->c_dc_scale;
-    }
-
-    ac_val += ((y) * wrap + (x)) * 16;
-    ac_val1 = ac_val;
-
-    /* B C
-     * A X
-     */
-    a = dc_val[(x - 1) + (y) * wrap];
-    c = dc_val[(x) + (y - 1) * wrap];
-
-    /* No prediction outside GOB boundary */
-    if(s->first_slice_line && n!=3){
-        if(n!=2) c= 1024;
-        if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
-    }
-
-    if (s->ac_pred) {
-        pred_dc = 1024;
-        if (s->h263_aic_dir) {
-            /* left prediction */
-            if (a != 1024) {
-                ac_val -= 16;
-                for(i=1;i<8;i++) {
-                    block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
-                }
-                pred_dc = a;
-            }
-        } else {
-            /* top prediction */
-            if (c != 1024) {
-                ac_val -= 16 * wrap;
-                for(i=1;i<8;i++) {
-                    block[s->dsp.idct_permutation[i   ]] += ac_val[i + 8];
-                }
-                pred_dc = c;
+    if (s->ac_pred) {
+        pred_dc = 1024;
+        if (s->h263_aic_dir) {
+            /* left prediction */
+            if (a != 1024) {
+                ac_val -= 16;
+                for(i=1;i<8;i++) {
+                    block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
+                }
+                pred_dc = a;
+            }
+        } else {
+            /* top prediction */
+            if (c != 1024) {
+                ac_val -= 16 * wrap;
+                for(i=1;i<8;i++) {
+                    block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
+                }
+                pred_dc = c;
             }
         }
     } else {
@@ -2095,14 +298,14 @@ static void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n)
 
     /* left copy */
     for(i=1;i<8;i++)
-        ac_val1[i    ] = block[s->dsp.idct_permutation[i<<3]];
+        ac_val1[i]     = block[s->idsp.idct_permutation[i << 3]];
     /* top copy */
     for(i=1;i<8;i++)
-        ac_val1[8 + i] = block[s->dsp.idct_permutation[i   ]];
+        ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
 }
 
-int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
-                        int *px, int *py)
+int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
+                             int *px, int *py)
 {
     int wrap;
     int16_t *A, *B, *C, (*mot_val)[2];
@@ -2114,7 +317,7 @@ int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
     A = mot_val[ - 1];
     /* special case for first (slice) line */
     if (s->first_slice_line && block<3) {
-        // we can't just change some MVs to simulate that as we need them for the B frames (and ME)
+        // we can't just change some MVs to simulate that as we need them for the B-frames (and ME)
         // and if we ever support non rectangular objects than we need to do a few ifs here anyway :(
         if(block==0){ //most common case
             if(s->mb_x  == s->resync_mb_x){ //rare
@@ -2158,4129 +361,3 @@ int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
     }
     return *mot_val;
 }
-
-#if CONFIG_ENCODERS
-
-/***************************************************/
-/**
- * add mpeg4 stuffing bits (01...1)
- */
-void ff_mpeg4_stuffing(PutBitContext * pbc)
-{
-    int length;
-    put_bits(pbc, 1, 0);
-    length= (-put_bits_count(pbc))&7;
-    if(length) put_bits(pbc, length, (1<<length)-1);
-}
-
-/* must be called before writing the header */
-void ff_set_mpeg4_time(MpegEncContext * s){
-    if(s->pict_type==FF_B_TYPE){
-        ff_mpeg4_init_direct_mv(s);
-    }else{
-        s->last_time_base= s->time_base;
-        s->time_base= s->time/s->avctx->time_base.den;
-    }
-}
-
-static void mpeg4_encode_gop_header(MpegEncContext * s){
-    int hours, minutes, seconds;
-    int64_t time;
-
-    put_bits(&s->pb, 16, 0);
-    put_bits(&s->pb, 16, GOP_STARTCODE);
-
-    time= s->current_picture_ptr->pts;
-    if(s->reordered_input_picture[1])
-        time= FFMIN(time, s->reordered_input_picture[1]->pts);
-    time= time*s->avctx->time_base.num;
-
-    seconds= time/s->avctx->time_base.den;
-    minutes= seconds/60; seconds %= 60;
-    hours= minutes/60; minutes %= 60;
-    hours%=24;
-
-    put_bits(&s->pb, 5, hours);
-    put_bits(&s->pb, 6, minutes);
-    put_bits(&s->pb, 1, 1);
-    put_bits(&s->pb, 6, seconds);
-
-    put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP));
-    put_bits(&s->pb, 1, 0); //broken link == NO
-
-    s->last_time_base= time / s->avctx->time_base.den;
-
-    ff_mpeg4_stuffing(&s->pb);
-}
-
-static void mpeg4_encode_visual_object_header(MpegEncContext * s){
-    int profile_and_level_indication;
-    int vo_ver_id;
-
-    if(s->avctx->profile != FF_PROFILE_UNKNOWN){
-        profile_and_level_indication = s->avctx->profile << 4;
-    }else if(s->max_b_frames || s->quarter_sample){
-        profile_and_level_indication= 0xF0; // adv simple
-    }else{
-        profile_and_level_indication= 0x00; // simple
-    }
-
-    if(s->avctx->level != FF_LEVEL_UNKNOWN){
-        profile_and_level_indication |= s->avctx->level;
-    }else{
-        profile_and_level_indication |= 1; //level 1
-    }
-
-    if(profile_and_level_indication>>4 == 0xF){
-        vo_ver_id= 5;
-    }else{
-        vo_ver_id= 1;
-    }
-
-    //FIXME levels
-
-    put_bits(&s->pb, 16, 0);
-    put_bits(&s->pb, 16, VOS_STARTCODE);
-
-    put_bits(&s->pb, 8, profile_and_level_indication);
-
-    put_bits(&s->pb, 16, 0);
-    put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
-
-    put_bits(&s->pb, 1, 1);
-        put_bits(&s->pb, 4, vo_ver_id);
-        put_bits(&s->pb, 3, 1); //priority
-
-    put_bits(&s->pb, 4, 1); //visual obj type== video obj
-
-    put_bits(&s->pb, 1, 0); //video signal type == no clue //FIXME
-
-    ff_mpeg4_stuffing(&s->pb);
-}
-
-static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number)
-{
-    int vo_ver_id;
-
-    if (!CONFIG_MPEG4_ENCODER)  return;
-
-    if(s->max_b_frames || s->quarter_sample){
-        vo_ver_id= 5;
-        s->vo_type= ADV_SIMPLE_VO_TYPE;
-    }else{
-        vo_ver_id= 1;
-        s->vo_type= SIMPLE_VO_TYPE;
-    }
-
-    put_bits(&s->pb, 16, 0);
-    put_bits(&s->pb, 16, 0x100 + vo_number);        /* video obj */
-    put_bits(&s->pb, 16, 0);
-    put_bits(&s->pb, 16, 0x120 + vol_number);       /* video obj layer */
-
-    put_bits(&s->pb, 1, 0);             /* random access vol */
-    put_bits(&s->pb, 8, s->vo_type);    /* video obj type indication */
-    if(s->workaround_bugs & FF_BUG_MS) {
-        put_bits(&s->pb, 1, 0);         /* is obj layer id= no */
-    } else {
-        put_bits(&s->pb, 1, 1);         /* is obj layer id= yes */
-        put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
-        put_bits(&s->pb, 3, 1);         /* is obj layer priority */
-    }
-
-    aspect_to_info(s, s->avctx->sample_aspect_ratio);
-
-    put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
-    if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
-        put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
-        put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
-    }
-
-    if(s->workaround_bugs & FF_BUG_MS) { //
-        put_bits(&s->pb, 1, 0);         /* vol control parameters= no @@@ */
-    } else {
-        put_bits(&s->pb, 1, 1);         /* vol control parameters= yes */
-        put_bits(&s->pb, 2, 1);         /* chroma format YUV 420/YV12 */
-        put_bits(&s->pb, 1, s->low_delay);
-        put_bits(&s->pb, 1, 0);         /* vbv parameters= no */
-    }
-
-    put_bits(&s->pb, 2, RECT_SHAPE);    /* vol shape= rectangle */
-    put_bits(&s->pb, 1, 1);             /* marker bit */
-
-    put_bits(&s->pb, 16, s->avctx->time_base.den);
-    if (s->time_increment_bits < 1)
-        s->time_increment_bits = 1;
-    put_bits(&s->pb, 1, 1);             /* marker bit */
-    put_bits(&s->pb, 1, 0);             /* fixed vop rate=no */
-    put_bits(&s->pb, 1, 1);             /* marker bit */
-    put_bits(&s->pb, 13, s->width);     /* vol width */
-    put_bits(&s->pb, 1, 1);             /* marker bit */
-    put_bits(&s->pb, 13, s->height);    /* vol height */
-    put_bits(&s->pb, 1, 1);             /* marker bit */
-    put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
-    put_bits(&s->pb, 1, 1);             /* obmc disable */
-    if (vo_ver_id == 1) {
-        put_bits(&s->pb, 1, s->vol_sprite_usage);       /* sprite enable */
-    }else{
-        put_bits(&s->pb, 2, s->vol_sprite_usage);       /* sprite enable */
-    }
-
-    put_bits(&s->pb, 1, 0);             /* not 8 bit == false */
-    put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
-
-    if(s->mpeg_quant){
-        ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
-        ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
-    }
-
-    if (vo_ver_id != 1)
-        put_bits(&s->pb, 1, s->quarter_sample);
-    put_bits(&s->pb, 1, 1);             /* complexity estimation disable */
-    s->resync_marker= s->rtp_mode;
-    put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
-    put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
-    if(s->data_partitioning){
-        put_bits(&s->pb, 1, 0);         /* no rvlc */
-    }
-
-    if (vo_ver_id != 1){
-        put_bits(&s->pb, 1, 0);         /* newpred */
-        put_bits(&s->pb, 1, 0);         /* reduced res vop */
-    }
-    put_bits(&s->pb, 1, 0);             /* scalability */
-
-    ff_mpeg4_stuffing(&s->pb);
-
-    /* user data */
-    if(!(s->flags & CODEC_FLAG_BITEXACT)){
-        put_bits(&s->pb, 16, 0);
-        put_bits(&s->pb, 16, 0x1B2);    /* user_data */
-        ff_put_string(&s->pb, LIBAVCODEC_IDENT, 0);
-    }
-}
-
-/* write mpeg4 VOP header */
-void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
-{
-    int time_incr;
-    int time_div, time_mod;
-
-    if(s->pict_type==FF_I_TYPE){
-        if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
-            if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
-                mpeg4_encode_visual_object_header(s);
-            if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
-                mpeg4_encode_vol_header(s, 0, 0);
-        }
-        if(!(s->workaround_bugs & FF_BUG_MS))
-            mpeg4_encode_gop_header(s);
-    }
-
-    s->partitioned_frame= s->data_partitioning && s->pict_type!=FF_B_TYPE;
-
-    put_bits(&s->pb, 16, 0);                /* vop header */
-    put_bits(&s->pb, 16, VOP_STARTCODE);    /* vop header */
-    put_bits(&s->pb, 2, s->pict_type - 1);  /* pict type: I = 0 , P = 1 */
-
-    assert(s->time>=0);
-    time_div= s->time/s->avctx->time_base.den;
-    time_mod= s->time%s->avctx->time_base.den;
-    time_incr= time_div - s->last_time_base;
-    assert(time_incr >= 0);
-    while(time_incr--)
-        put_bits(&s->pb, 1, 1);
-
-    put_bits(&s->pb, 1, 0);
-
-    put_bits(&s->pb, 1, 1);                             /* marker */
-    put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
-    put_bits(&s->pb, 1, 1);                             /* marker */
-    put_bits(&s->pb, 1, 1);                             /* vop coded */
-    if (    s->pict_type == FF_P_TYPE
-        || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE)) {
-        put_bits(&s->pb, 1, s->no_rounding);    /* rounding type */
-    }
-    put_bits(&s->pb, 3, 0);     /* intra dc VLC threshold */
-    if(!s->progressive_sequence){
-         put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
-         put_bits(&s->pb, 1, s->alternate_scan);
-    }
-    //FIXME sprite stuff
-
-    put_bits(&s->pb, 5, s->qscale);
-
-    if (s->pict_type != FF_I_TYPE)
-        put_bits(&s->pb, 3, s->f_code); /* fcode_for */
-    if (s->pict_type == FF_B_TYPE)
-        put_bits(&s->pb, 3, s->b_code); /* fcode_back */
-}
-
-void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code)
-{
-    int range, l, bit_size, sign, code, bits;
-
-    if (val == 0) {
-        /* zero vector */
-        code = 0;
-        put_bits(&s->pb, mvtab[code][1], mvtab[code][0]);
-    } else {
-        bit_size = f_code - 1;
-        range = 1 << bit_size;
-        /* modulo encoding */
-        l= INT_BIT - 6 - bit_size;
-        val = (val<<l)>>l;
-        sign = val>>31;
-        val= (val^sign)-sign;
-        sign&=1;
-
-        val--;
-        code = (val >> bit_size) + 1;
-        bits = val & (range - 1);
-
-        put_bits(&s->pb, mvtab[code][1] + 1, (mvtab[code][0] << 1) | sign);
-        if (bit_size > 0) {
-            put_bits(&s->pb, bit_size, bits);
-        }
-    }
-}
-
-static void init_mv_penalty_and_fcode(MpegEncContext *s)
-{
-    int f_code;
-    int mv;
-
-    for(f_code=1; f_code<=MAX_FCODE; f_code++){
-        for(mv=-MAX_MV; mv<=MAX_MV; mv++){
-            int len;
-
-            if(mv==0) len= mvtab[0][1];
-            else{
-                int val, bit_size, code;
-
-                bit_size = f_code - 1;
-
-                val=mv;
-                if (val < 0)
-                    val = -val;
-                val--;
-                code = (val >> bit_size) + 1;
-                if(code<33){
-                    len= mvtab[code][1] + 1 + bit_size;
-                }else{
-                    len= mvtab[32][1] + av_log2(code>>5) + 2 + bit_size;
-                }
-            }
-
-            mv_penalty[f_code][mv+MAX_MV]= len;
-        }
-    }
-
-    for(f_code=MAX_FCODE; f_code>0; f_code--){
-        for(mv=-(16<<f_code); mv<(16<<f_code); mv++){
-            fcode_tab[mv+MAX_MV]= f_code;
-        }
-    }
-
-    for(mv=0; mv<MAX_MV*2+1; mv++){
-        umv_fcode_tab[mv]= 1;
-    }
-}
-
-static void init_uni_dc_tab(void)
-{
-    int level, uni_code, uni_len;
-
-    for(level=-256; level<256; level++){
-        int size, v, l;
-        /* find number of bits */
-        size = 0;
-        v = abs(level);
-        while (v) {
-            v >>= 1;
-            size++;
-        }
-
-        if (level < 0)
-            l= (-level) ^ ((1 << size) - 1);
-        else
-            l= level;
-
-        /* luminance */
-        uni_code= DCtab_lum[size][0];
-        uni_len = DCtab_lum[size][1];
-
-        if (size > 0) {
-            uni_code<<=size; uni_code|=l;
-            uni_len+=size;
-            if (size > 8){
-                uni_code<<=1; uni_code|=1;
-                uni_len++;
-            }
-        }
-        uni_DCtab_lum_bits[level+256]= uni_code;
-        uni_DCtab_lum_len [level+256]= uni_len;
-
-        /* chrominance */
-        uni_code= DCtab_chrom[size][0];
-        uni_len = DCtab_chrom[size][1];
-
-        if (size > 0) {
-            uni_code<<=size; uni_code|=l;
-            uni_len+=size;
-            if (size > 8){
-                uni_code<<=1; uni_code|=1;
-                uni_len++;
-            }
-        }
-        uni_DCtab_chrom_bits[level+256]= uni_code;
-        uni_DCtab_chrom_len [level+256]= uni_len;
-
-    }
-}
-
-static void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
-    int slevel, run, last;
-
-    assert(MAX_LEVEL >= 64);
-    assert(MAX_RUN   >= 63);
-
-    for(slevel=-64; slevel<64; slevel++){
-        if(slevel==0) continue;
-        for(run=0; run<64; run++){
-            for(last=0; last<=1; last++){
-                const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
-                int level= slevel < 0 ? -slevel : slevel;
-                int sign= slevel < 0 ? 1 : 0;
-                int bits, len, code;
-                int level1, run1;
-
-                len_tab[index]= 100;
-
-                /* ESC0 */
-                code= get_rl_index(rl, last, run, level);
-                bits= rl->table_vlc[code][0];
-                len=  rl->table_vlc[code][1];
-                bits=bits*2+sign; len++;
-
-                if(code!=rl->n && len < len_tab[index]){
-                    bits_tab[index]= bits;
-                    len_tab [index]= len;
-                }
-                /* ESC1 */
-                bits= rl->table_vlc[rl->n][0];
-                len=  rl->table_vlc[rl->n][1];
-                bits=bits*2;    len++; //esc1
-                level1= level - rl->max_level[last][run];
-                if(level1>0){
-                    code= get_rl_index(rl, last, run, level1);
-                    bits<<= rl->table_vlc[code][1];
-                    len  += rl->table_vlc[code][1];
-                    bits += rl->table_vlc[code][0];
-                    bits=bits*2+sign; len++;
-
-                    if(code!=rl->n && len < len_tab[index]){
-                        bits_tab[index]= bits;
-                        len_tab [index]= len;
-                    }
-                }
-                /* ESC2 */
-                bits= rl->table_vlc[rl->n][0];
-                len=  rl->table_vlc[rl->n][1];
-                bits=bits*4+2;    len+=2; //esc2
-                run1 = run - rl->max_run[last][level] - 1;
-                if(run1>=0){
-                    code= get_rl_index(rl, last, run1, level);
-                    bits<<= rl->table_vlc[code][1];
-                    len  += rl->table_vlc[code][1];
-                    bits += rl->table_vlc[code][0];
-                    bits=bits*2+sign; len++;
-
-                    if(code!=rl->n && len < len_tab[index]){
-                        bits_tab[index]= bits;
-                        len_tab [index]= len;
-                    }
-                }
-                /* ESC3 */
-                bits= rl->table_vlc[rl->n][0];
-                len = rl->table_vlc[rl->n][1];
-                bits=bits*4+3;    len+=2; //esc3
-                bits=bits*2+last; len++;
-                bits=bits*64+run; len+=6;
-                bits=bits*2+1;    len++;  //marker
-                bits=bits*4096+(slevel&0xfff); len+=12;
-                bits=bits*2+1;    len++;  //marker
-
-                if(len < len_tab[index]){
-                    bits_tab[index]= bits;
-                    len_tab [index]= len;
-                }
-            }
-        }
-    }
-}
-
-static void init_uni_h263_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
-    int slevel, run, last;
-
-    assert(MAX_LEVEL >= 64);
-    assert(MAX_RUN   >= 63);
-
-    for(slevel=-64; slevel<64; slevel++){
-        if(slevel==0) continue;
-        for(run=0; run<64; run++){
-            for(last=0; last<=1; last++){
-                const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
-                int level= slevel < 0 ? -slevel : slevel;
-                int sign= slevel < 0 ? 1 : 0;
-                int bits, len, code;
-
-                len_tab[index]= 100;
-
-                /* ESC0 */
-                code= get_rl_index(rl, last, run, level);
-                bits= rl->table_vlc[code][0];
-                len=  rl->table_vlc[code][1];
-                bits=bits*2+sign; len++;
-
-                if(code!=rl->n && len < len_tab[index]){
-                    if(bits_tab) bits_tab[index]= bits;
-                    len_tab [index]= len;
-                }
-                /* ESC */
-                bits= rl->table_vlc[rl->n][0];
-                len = rl->table_vlc[rl->n][1];
-                bits=bits*2+last; len++;
-                bits=bits*64+run; len+=6;
-                bits=bits*256+(level&0xff); len+=8;
-
-                if(len < len_tab[index]){
-                    if(bits_tab) bits_tab[index]= bits;
-                    len_tab [index]= len;
-                }
-            }
-        }
-    }
-}
-
-void h263_encode_init(MpegEncContext *s)
-{
-    static int done = 0;
-
-    if (!done) {
-        done = 1;
-
-        init_uni_dc_tab();
-
-        init_rl(&rl_inter, static_rl_table_store[0]);
-        init_rl(&rl_intra, static_rl_table_store[1]);
-        init_rl(&rl_intra_aic, static_rl_table_store[2]);
-
-        init_uni_mpeg4_rl_tab(&rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
-        init_uni_mpeg4_rl_tab(&rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
-
-        init_uni_h263_rl_tab(&rl_intra_aic, NULL, uni_h263_intra_aic_rl_len);
-        init_uni_h263_rl_tab(&rl_inter    , NULL, uni_h263_inter_rl_len);
-
-        init_mv_penalty_and_fcode(s);
-    }
-    s->me.mv_penalty= mv_penalty; //FIXME exact table for msmpeg4 & h263p
-
-    s->intra_ac_vlc_length     =s->inter_ac_vlc_length     = uni_h263_inter_rl_len;
-    s->intra_ac_vlc_last_length=s->inter_ac_vlc_last_length= uni_h263_inter_rl_len + 128*64;
-    if(s->h263_aic){
-        s->intra_ac_vlc_length     = uni_h263_intra_aic_rl_len;
-        s->intra_ac_vlc_last_length= uni_h263_intra_aic_rl_len + 128*64;
-    }
-    s->ac_esc_length= 7+1+6+8;
-
-    // use fcodes >1 only for mpeg4 & h263 & h263p FIXME
-    switch(s->codec_id){
-    case CODEC_ID_MPEG4:
-        s->fcode_tab= fcode_tab;
-        s->min_qcoeff= -2048;
-        s->max_qcoeff=  2047;
-        s->intra_ac_vlc_length     = uni_mpeg4_intra_rl_len;
-        s->intra_ac_vlc_last_length= uni_mpeg4_intra_rl_len + 128*64;
-        s->inter_ac_vlc_length     = uni_mpeg4_inter_rl_len;
-        s->inter_ac_vlc_last_length= uni_mpeg4_inter_rl_len + 128*64;
-        s->luma_dc_vlc_length= uni_DCtab_lum_len;
-        s->chroma_dc_vlc_length= uni_DCtab_chrom_len;
-        s->ac_esc_length= 7+2+1+6+1+12+1;
-        s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
-        s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
-
-        if(s->flags & CODEC_FLAG_GLOBAL_HEADER){
-
-            s->avctx->extradata= av_malloc(1024);
-            init_put_bits(&s->pb, s->avctx->extradata, 1024);
-
-            if(!(s->workaround_bugs & FF_BUG_MS))
-                mpeg4_encode_visual_object_header(s);
-            mpeg4_encode_vol_header(s, 0, 0);
-
-//            ff_mpeg4_stuffing(&s->pb); ?
-            flush_put_bits(&s->pb);
-            s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
-        }
-
-        break;
-    case CODEC_ID_H263P:
-        if(s->umvplus)
-            s->fcode_tab= umv_fcode_tab;
-        if(s->modified_quant){
-            s->min_qcoeff= -2047;
-            s->max_qcoeff=  2047;
-        }else{
-            s->min_qcoeff= -127;
-            s->max_qcoeff=  127;
-        }
-        break;
-        //Note for mpeg4 & h263 the dc-scale table will be set per frame as needed later
-    case CODEC_ID_FLV1:
-        if (s->h263_flv > 1) {
-            s->min_qcoeff= -1023;
-            s->max_qcoeff=  1023;
-        } else {
-            s->min_qcoeff= -127;
-            s->max_qcoeff=  127;
-        }
-        s->y_dc_scale_table=
-        s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
-        break;
-    default: //nothing needed - default table already set in mpegvideo.c
-        s->min_qcoeff= -127;
-        s->max_qcoeff=  127;
-        s->y_dc_scale_table=
-        s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
-    }
-}
-#endif //CONFIG_ENCODERS
-
-/**
- * predicts the ac.
- * @param n block index (0-3 are luma, 4-5 are chroma)
- * @param dir the ac prediction direction
- */
-void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
-                   int dir)
-{
-    int i;
-    int16_t *ac_val, *ac_val1;
-    int8_t * const qscale_table= s->current_picture.qscale_table;
-
-    /* find prediction */
-    ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
-    ac_val1 = ac_val;
-    if (s->ac_pred) {
-        if (dir == 0) {
-            const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
-            /* left prediction */
-            ac_val -= 16;
-
-            if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
-                /* same qscale */
-                for(i=1;i<8;i++) {
-                    block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
-                }
-            }else{
-                /* different qscale, we must rescale */
-                for(i=1;i<8;i++) {
-                    block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
-                }
-            }
-        } else {
-            const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
-            /* top prediction */
-            ac_val -= 16 * s->block_wrap[n];
-
-            if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
-                /* same qscale */
-                for(i=1;i<8;i++) {
-                    block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
-                }
-            }else{
-                /* different qscale, we must rescale */
-                for(i=1;i<8;i++) {
-                    block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
-                }
-            }
-        }
-    }
-    /* left copy */
-    for(i=1;i<8;i++)
-        ac_val1[i    ] = block[s->dsp.idct_permutation[i<<3]];
-
-    /* top copy */
-    for(i=1;i<8;i++)
-        ac_val1[8 + i] = block[s->dsp.idct_permutation[i   ]];
-
-}
-
-/***********************************************/
-/* decoding */
-
-static VLC intra_MCBPC_vlc;
-static VLC inter_MCBPC_vlc;
-static VLC cbpy_vlc;
-static VLC mv_vlc;
-static VLC dc_lum, dc_chrom;
-static VLC sprite_trajectory;
-static VLC mb_type_b_vlc;
-static VLC h263_mbtype_b_vlc;
-static VLC cbpc_b_vlc;
-
-/* init vlcs */
-
-/* XXX: find a better solution to handle static init */
-void h263_decode_init_vlc(MpegEncContext *s)
-{
-    static int done = 0;
-
-    if (!done) {
-        done = 1;
-
-        INIT_VLC_STATIC(&intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
-                 intra_MCBPC_bits, 1, 1,
-                 intra_MCBPC_code, 1, 1, 72);
-        INIT_VLC_STATIC(&inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
-                 inter_MCBPC_bits, 1, 1,
-                 inter_MCBPC_code, 1, 1, 198);
-        INIT_VLC_STATIC(&cbpy_vlc, CBPY_VLC_BITS, 16,
-                 &cbpy_tab[0][1], 2, 1,
-                 &cbpy_tab[0][0], 2, 1, 64);
-        INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,
-                 &mvtab[0][1], 2, 1,
-                 &mvtab[0][0], 2, 1, 538);
-        init_rl(&rl_inter, static_rl_table_store[0]);
-        init_rl(&rl_intra, static_rl_table_store[1]);
-        init_rl(&rvlc_rl_inter, static_rl_table_store[3]);
-        init_rl(&rvlc_rl_intra, static_rl_table_store[4]);
-        init_rl(&rl_intra_aic, static_rl_table_store[2]);
-        INIT_VLC_RL(rl_inter, 554);
-        INIT_VLC_RL(rl_intra, 554);
-        INIT_VLC_RL(rvlc_rl_inter, 1072);
-        INIT_VLC_RL(rvlc_rl_intra, 1072);
-        INIT_VLC_RL(rl_intra_aic, 554);
-        INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
-                 &DCtab_lum[0][1], 2, 1,
-                 &DCtab_lum[0][0], 2, 1, 512);
-        INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
-                 &DCtab_chrom[0][1], 2, 1,
-                 &DCtab_chrom[0][0], 2, 1, 512);
-        INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
-                 &sprite_trajectory_tab[0][1], 4, 2,
-                 &sprite_trajectory_tab[0][0], 4, 2, 128);
-        INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
-                 &mb_type_b_tab[0][1], 2, 1,
-                 &mb_type_b_tab[0][0], 2, 1, 16);
-        INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
-                 &h263_mbtype_b_tab[0][1], 2, 1,
-                 &h263_mbtype_b_tab[0][0], 2, 1, 80);
-        INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
-                 &cbpc_b_tab[0][1], 2, 1,
-                 &cbpc_b_tab[0][0], 2, 1, 8);
-    }
-}
-
-/**
- * Get the GOB height based on picture height.
- */
-int ff_h263_get_gob_height(MpegEncContext *s){
-    if (s->height <= 400)
-        return 1;
-    else if (s->height <= 800)
-        return  2;
-    else
-        return 4;
-}
-
-int ff_h263_decode_mba(MpegEncContext *s)
-{
-    int i, mb_pos;
-
-    for(i=0; i<6; i++){
-        if(s->mb_num-1 <= ff_mba_max[i]) break;
-    }
-    mb_pos= get_bits(&s->gb, ff_mba_length[i]);
-    s->mb_x= mb_pos % s->mb_width;
-    s->mb_y= mb_pos / s->mb_width;
-
-    return mb_pos;
-}
-
-void ff_h263_encode_mba(MpegEncContext *s)
-{
-    int i, mb_pos;
-
-    for(i=0; i<6; i++){
-        if(s->mb_num-1 <= ff_mba_max[i]) break;
-    }
-    mb_pos= s->mb_x + s->mb_width*s->mb_y;
-    put_bits(&s->pb, ff_mba_length[i], mb_pos);
-}
-
-/**
- * decodes the group of blocks header or slice header.
- * @return <0 if an error occurred
- */
-static int h263_decode_gob_header(MpegEncContext *s)
-{
-    unsigned int val, gfid, gob_number;
-    int left;
-
-    /* Check for GOB Start Code */
-    val = show_bits(&s->gb, 16);
-    if(val)
-        return -1;
-
-        /* We have a GBSC probably with GSTUFF */
-    skip_bits(&s->gb, 16); /* Drop the zeros */
-    left= get_bits_left(&s->gb);
-    //MN: we must check the bits left or we might end in a infinite loop (or segfault)
-    for(;left>13; left--){
-        if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
-    }
-    if(left<=13)
-        return -1;
-
-    if(s->h263_slice_structured){
-        if(get_bits1(&s->gb)==0)
-            return -1;
-
-        ff_h263_decode_mba(s);
-
-        if(s->mb_num > 1583)
-            if(get_bits1(&s->gb)==0)
-                return -1;
-
-        s->qscale = get_bits(&s->gb, 5); /* SQUANT */
-        if(get_bits1(&s->gb)==0)
-            return -1;
-        gfid = get_bits(&s->gb, 2); /* GFID */
-    }else{
-        gob_number = get_bits(&s->gb, 5); /* GN */
-        s->mb_x= 0;
-        s->mb_y= s->gob_index* gob_number;
-        gfid = get_bits(&s->gb, 2); /* GFID */
-        s->qscale = get_bits(&s->gb, 5); /* GQUANT */
-    }
-
-    if(s->mb_y >= s->mb_height)
-        return -1;
-
-    if(s->qscale==0)
-        return -1;
-
-    return 0;
-}
-
-static inline void memsetw(short *tab, int val, int n)
-{
-    int i;
-    for(i=0;i<n;i++)
-        tab[i] = val;
-}
-
-#if CONFIG_ENCODERS
-
-void ff_mpeg4_init_partitions(MpegEncContext *s)
-{
-    uint8_t *start= put_bits_ptr(&s->pb);
-    uint8_t *end= s->pb.buf_end;
-    int size= end - start;
-    int pb_size = (((intptr_t)start + size/3)&(~3)) - (intptr_t)start;
-    int tex_size= (size - 2*pb_size)&(~3);
-
-    set_put_bits_buffer_size(&s->pb, pb_size);
-    init_put_bits(&s->tex_pb, start + pb_size           , tex_size);
-    init_put_bits(&s->pb2   , start + pb_size + tex_size, pb_size);
-}
-
-void ff_mpeg4_merge_partitions(MpegEncContext *s)
-{
-    const int pb2_len   = put_bits_count(&s->pb2   );
-    const int tex_pb_len= put_bits_count(&s->tex_pb);
-    const int bits= put_bits_count(&s->pb);
-
-    if(s->pict_type==FF_I_TYPE){
-        put_bits(&s->pb, 19, DC_MARKER);
-        s->misc_bits+=19 + pb2_len + bits - s->last_bits;
-        s->i_tex_bits+= tex_pb_len;
-    }else{
-        put_bits(&s->pb, 17, MOTION_MARKER);
-        s->misc_bits+=17 + pb2_len;
-        s->mv_bits+= bits - s->last_bits;
-        s->p_tex_bits+= tex_pb_len;
-    }
-
-    flush_put_bits(&s->pb2);
-    flush_put_bits(&s->tex_pb);
-
-    set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
-    ff_copy_bits(&s->pb, s->pb2.buf   , pb2_len);
-    ff_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
-    s->last_bits= put_bits_count(&s->pb);
-}
-
-#endif //CONFIG_ENCODERS
-
-int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s){
-    switch(s->pict_type){
-        case FF_I_TYPE:
-            return 16;
-        case FF_P_TYPE:
-        case FF_S_TYPE:
-            return s->f_code+15;
-        case FF_B_TYPE:
-            return FFMAX3(s->f_code, s->b_code, 2) + 15;
-        default:
-            return -1;
-    }
-}
-
-#if CONFIG_ENCODERS
-
-void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
-{
-    int mb_num_bits= av_log2(s->mb_num - 1) + 1;
-
-    put_bits(&s->pb, ff_mpeg4_get_video_packet_prefix_length(s), 0);
-    put_bits(&s->pb, 1, 1);
-
-    put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
-    put_bits(&s->pb, s->quant_precision, s->qscale);
-    put_bits(&s->pb, 1, 0); /* no HEC */
-}
-
-#endif //CONFIG_ENCODERS
-
-/**
- * check if the next stuff is a resync marker or the end.
- * @return 0 if not
- */
-static inline int mpeg4_is_resync(MpegEncContext *s){
-    int bits_count= get_bits_count(&s->gb);
-    int v= show_bits(&s->gb, 16);
-
-    if(s->workaround_bugs&FF_BUG_NO_PADDING){
-        return 0;
-    }
-
-    while(v<=0xFF){
-        if(s->pict_type==FF_B_TYPE || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
-            break;
-        skip_bits(&s->gb, 8+s->pict_type);
-        bits_count+= 8+s->pict_type;
-        v= show_bits(&s->gb, 16);
-    }
-
-    if(bits_count + 8 >= s->gb.size_in_bits){
-        v>>=8;
-        v|= 0x7F >> (7-(bits_count&7));
-
-        if(v==0x7F)
-            return 1;
-    }else{
-        if(v == ff_mpeg4_resync_prefix[bits_count&7]){
-            int len;
-            GetBitContext gb= s->gb;
-
-            skip_bits(&s->gb, 1);
-            align_get_bits(&s->gb);
-
-            for(len=0; len<32; len++){
-                if(get_bits1(&s->gb)) break;
-            }
-
-            s->gb= gb;
-
-            if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
-                return 1;
-        }
-    }
-    return 0;
-}
-
-static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
-{
-    int i;
-    int a= 2<<s->sprite_warping_accuracy;
-    int rho= 3-s->sprite_warping_accuracy;
-    int r=16/a;
-    const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
-    int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
-    int sprite_ref[4][2];
-    int virtual_ref[2][2];
-    int w2, h2, w3, h3;
-    int alpha=0, beta=0;
-    int w= s->width;
-    int h= s->height;
-    int min_ab;
-
-    for(i=0; i<s->num_sprite_warping_points; i++){
-        int length;
-        int x=0, y=0;
-
-        length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
-        if(length){
-            x= get_xbits(gb, length);
-        }
-        if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
-
-        length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
-        if(length){
-            y=get_xbits(gb, length);
-        }
-        skip_bits1(gb); /* marker bit */
-        s->sprite_traj[i][0]= d[i][0]= x;
-        s->sprite_traj[i][1]= d[i][1]= y;
-    }
-    for(; i<4; i++)
-        s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
-
-    while((1<<alpha)<w) alpha++;
-    while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
-    w2= 1<<alpha;
-    h2= 1<<beta;
-
-// Note, the 4th point isn't used for GMC
-    if(s->divx_version==500 && s->divx_build==413){
-        sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
-        sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
-        sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
-        sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
-        sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
-        sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
-    } else {
-        sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
-        sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
-        sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
-        sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
-        sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
-        sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
-    }
-/*    sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
-    sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
-
-// this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
-// perhaps it should be reordered to be more readable ...
-// the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
-// so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
-    virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
-        + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0])),w);
-    virtual_ref[0][1]= 16*vop_ref[0][1]
-        + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1])),w);
-    virtual_ref[1][0]= 16*vop_ref[0][0]
-        + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0])),h);
-    virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
-        + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1])),h);
-
-    switch(s->num_sprite_warping_points)
-    {
-        case 0:
-            s->sprite_offset[0][0]= 0;
-            s->sprite_offset[0][1]= 0;
-            s->sprite_offset[1][0]= 0;
-            s->sprite_offset[1][1]= 0;
-            s->sprite_delta[0][0]= a;
-            s->sprite_delta[0][1]= 0;
-            s->sprite_delta[1][0]= 0;
-            s->sprite_delta[1][1]= a;
-            s->sprite_shift[0]= 0;
-            s->sprite_shift[1]= 0;
-            break;
-        case 1: //GMC only
-            s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
-            s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
-            s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
-            s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
-            s->sprite_delta[0][0]= a;
-            s->sprite_delta[0][1]= 0;
-            s->sprite_delta[1][0]= 0;
-            s->sprite_delta[1][1]= a;
-            s->sprite_shift[0]= 0;
-            s->sprite_shift[1]= 0;
-            break;
-        case 2:
-            s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
-                                                  + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
-                                                  + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
-                                                  + (1<<(alpha+rho-1));
-            s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
-                                                  + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
-                                                  + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
-                                                  + (1<<(alpha+rho-1));
-            s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
-                                     +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
-                                     +2*w2*r*sprite_ref[0][0]
-                                     - 16*w2
-                                     + (1<<(alpha+rho+1)));
-            s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
-                                     +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
-                                     +2*w2*r*sprite_ref[0][1]
-                                     - 16*w2
-                                     + (1<<(alpha+rho+1)));
-            s->sprite_delta[0][0]=   (-r*sprite_ref[0][0] + virtual_ref[0][0]);
-            s->sprite_delta[0][1]=   (+r*sprite_ref[0][1] - virtual_ref[0][1]);
-            s->sprite_delta[1][0]=   (-r*sprite_ref[0][1] + virtual_ref[0][1]);
-            s->sprite_delta[1][1]=   (-r*sprite_ref[0][0] + virtual_ref[0][0]);
-
-            s->sprite_shift[0]= alpha+rho;
-            s->sprite_shift[1]= alpha+rho+2;
-            break;
-        case 3:
-            min_ab= FFMIN(alpha, beta);
-            w3= w2>>min_ab;
-            h3= h2>>min_ab;
-            s->sprite_offset[0][0]=  (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
-                                   + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
-                                   + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
-                                   + (1<<(alpha+beta+rho-min_ab-1));
-            s->sprite_offset[0][1]=  (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
-                                   + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
-                                   + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
-                                   + (1<<(alpha+beta+rho-min_ab-1));
-            s->sprite_offset[1][0]=  (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
-                                   + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
-                                   + 2*w2*h3*r*sprite_ref[0][0]
-                                   - 16*w2*h3
-                                   + (1<<(alpha+beta+rho-min_ab+1));
-            s->sprite_offset[1][1]=  (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
-                                   + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
-                                   + 2*w2*h3*r*sprite_ref[0][1]
-                                   - 16*w2*h3
-                                   + (1<<(alpha+beta+rho-min_ab+1));
-            s->sprite_delta[0][0]=   (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
-            s->sprite_delta[0][1]=   (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
-            s->sprite_delta[1][0]=   (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
-            s->sprite_delta[1][1]=   (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
-
-            s->sprite_shift[0]= alpha + beta + rho - min_ab;
-            s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
-            break;
-    }
-    /* try to simplify the situation */
-    if(   s->sprite_delta[0][0] == a<<s->sprite_shift[0]
-       && s->sprite_delta[0][1] == 0
-       && s->sprite_delta[1][0] == 0
-       && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
-    {
-        s->sprite_offset[0][0]>>=s->sprite_shift[0];
-        s->sprite_offset[0][1]>>=s->sprite_shift[0];
-        s->sprite_offset[1][0]>>=s->sprite_shift[1];
-        s->sprite_offset[1][1]>>=s->sprite_shift[1];
-        s->sprite_delta[0][0]= a;
-        s->sprite_delta[0][1]= 0;
-        s->sprite_delta[1][0]= 0;
-        s->sprite_delta[1][1]= a;
-        s->sprite_shift[0]= 0;
-        s->sprite_shift[1]= 0;
-        s->real_sprite_warping_points=1;
-    }
-    else{
-        int shift_y= 16 - s->sprite_shift[0];
-        int shift_c= 16 - s->sprite_shift[1];
-        for(i=0; i<2; i++){
-            s->sprite_offset[0][i]<<= shift_y;
-            s->sprite_offset[1][i]<<= shift_c;
-            s->sprite_delta[0][i]<<= shift_y;
-            s->sprite_delta[1][i]<<= shift_y;
-            s->sprite_shift[i]= 16;
-        }
-        s->real_sprite_warping_points= s->num_sprite_warping_points;
-    }
-}
-
-/**
- * decodes the next video packet.
- * @return <0 if something went wrong
- */
-static int mpeg4_decode_video_packet_header(MpegEncContext *s)
-{
-    int mb_num_bits= av_log2(s->mb_num - 1) + 1;
-    int header_extension=0, mb_num, len;
-
-    /* is there enough space left for a video packet + header */
-    if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
-
-    for(len=0; len<32; len++){
-        if(get_bits1(&s->gb)) break;
-    }
-
-    if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
-        av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
-        return -1;
-    }
-
-    if(s->shape != RECT_SHAPE){
-        header_extension= get_bits1(&s->gb);
-        //FIXME more stuff here
-    }
-
-    mb_num= get_bits(&s->gb, mb_num_bits);
-    if(mb_num>=s->mb_num){
-        av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
-        return -1;
-    }
-    if(s->pict_type == FF_B_TYPE){
-        while(s->next_picture.mbskip_table[ s->mb_index2xy[ mb_num ] ]) mb_num++;
-        if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded
-    }
-
-    s->mb_x= mb_num % s->mb_width;
-    s->mb_y= mb_num / s->mb_width;
-
-    if(s->shape != BIN_ONLY_SHAPE){
-        int qscale= get_bits(&s->gb, s->quant_precision);
-        if(qscale)
-            s->chroma_qscale=s->qscale= qscale;
-    }
-
-    if(s->shape == RECT_SHAPE){
-        header_extension= get_bits1(&s->gb);
-    }
-    if(header_extension){
-        int time_increment;
-        int time_incr=0;
-
-        while (get_bits1(&s->gb) != 0)
-            time_incr++;
-
-        check_marker(&s->gb, "before time_increment in video packed header");
-        time_increment= get_bits(&s->gb, s->time_increment_bits);
-        check_marker(&s->gb, "before vop_coding_type in video packed header");
-
-        skip_bits(&s->gb, 2); /* vop coding type */
-        //FIXME not rect stuff here
-
-        if(s->shape != BIN_ONLY_SHAPE){
-            skip_bits(&s->gb, 3); /* intra dc vlc threshold */
-//FIXME don't just ignore everything
-            if(s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
-                mpeg4_decode_sprite_trajectory(s, &s->gb);
-                av_log(s->avctx, AV_LOG_ERROR, "untested\n");
-            }
-
-            //FIXME reduced res stuff here
-
-            if (s->pict_type != FF_I_TYPE) {
-                int f_code = get_bits(&s->gb, 3);       /* fcode_for */
-                if(f_code==0){
-                    av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
-                }
-            }
-            if (s->pict_type == FF_B_TYPE) {
-                int b_code = get_bits(&s->gb, 3);
-                if(b_code==0){
-                    av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
-                }
-            }
-        }
-    }
-    //FIXME new-pred stuff
-
-    return 0;
-}
-
-void ff_mpeg4_clean_buffers(MpegEncContext *s)
-{
-    int c_wrap, c_xy, l_wrap, l_xy;
-
-    l_wrap= s->b8_stride;
-    l_xy= (2*s->mb_y-1)*l_wrap + s->mb_x*2 - 1;
-    c_wrap= s->mb_stride;
-    c_xy= (s->mb_y-1)*c_wrap + s->mb_x - 1;
-
-#if 0
-    /* clean DC */
-    memsetw(s->dc_val[0] + l_xy, 1024, l_wrap*2+1);
-    memsetw(s->dc_val[1] + c_xy, 1024, c_wrap+1);
-    memsetw(s->dc_val[2] + c_xy, 1024, c_wrap+1);
-#endif
-
-    /* clean AC */
-    memset(s->ac_val[0] + l_xy, 0, (l_wrap*2+1)*16*sizeof(int16_t));
-    memset(s->ac_val[1] + c_xy, 0, (c_wrap  +1)*16*sizeof(int16_t));
-    memset(s->ac_val[2] + c_xy, 0, (c_wrap  +1)*16*sizeof(int16_t));
-
-    /* clean MV */
-    // we can't clear the MVs as they might be needed by a b frame
-//    memset(s->motion_val + l_xy, 0, (l_wrap*2+1)*2*sizeof(int16_t));
-//    memset(s->motion_val, 0, 2*sizeof(int16_t)*(2 + s->mb_width*2)*(2 + s->mb_height*2));
-    s->last_mv[0][0][0]=
-    s->last_mv[0][0][1]=
-    s->last_mv[1][0][0]=
-    s->last_mv[1][0][1]= 0;
-}
-
-/**
- * finds the next resync_marker
- * @param p pointer to buffer to scan
- * @param end pointer to the end of the buffer
- * @return pointer to the next resync_marker, or end if none was found
- */
-const uint8_t *ff_h263_find_resync_marker(const uint8_t *restrict p, const uint8_t * restrict end)
-{
-    assert(p < end);
-
-    end-=2;
-    p++;
-    for(;p<end; p+=2){
-        if(!*p){
-            if     (!p[-1] && p[1]) return p - 1;
-            else if(!p[ 1] && p[2]) return p;
-        }
-    }
-    return end+2;
-}
-
-/**
- * decodes the group of blocks / video packet header.
- * @return bit position of the resync_marker, or <0 if none was found
- */
-int ff_h263_resync(MpegEncContext *s){
-    int left, pos, ret;
-
-    if(s->codec_id==CODEC_ID_MPEG4){
-        skip_bits1(&s->gb);
-        align_get_bits(&s->gb);
-    }
-
-    if(show_bits(&s->gb, 16)==0){
-        pos= get_bits_count(&s->gb);
-        if(s->codec_id==CODEC_ID_MPEG4)
-            ret= mpeg4_decode_video_packet_header(s);
-        else
-            ret= h263_decode_gob_header(s);
-        if(ret>=0)
-            return pos;
-    }
-    //OK, it's not where it is supposed to be ...
-    s->gb= s->last_resync_gb;
-    align_get_bits(&s->gb);
-    left= get_bits_left(&s->gb);
-
-    for(;left>16+1+5+5; left-=8){
-        if(show_bits(&s->gb, 16)==0){
-            GetBitContext bak= s->gb;
-
-            pos= get_bits_count(&s->gb);
-            if(s->codec_id==CODEC_ID_MPEG4)
-                ret= mpeg4_decode_video_packet_header(s);
-            else
-                ret= h263_decode_gob_header(s);
-            if(ret>=0)
-                return pos;
-
-            s->gb= bak;
-        }
-        skip_bits(&s->gb, 8);
-    }
-
-    return -1;
-}
-
-static int h263_decode_motion(MpegEncContext * s, int pred, int f_code)
-{
-    int code, val, sign, shift, l;
-    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
-
-    if (code == 0)
-        return pred;
-    if (code < 0)
-        return 0xffff;
-
-    sign = get_bits1(&s->gb);
-    shift = f_code - 1;
-    val = code;
-    if (shift) {
-        val = (val - 1) << shift;
-        val |= get_bits(&s->gb, shift);
-        val++;
-    }
-    if (sign)
-        val = -val;
-    val += pred;
-
-    /* modulo decoding */
-    if (!s->h263_long_vectors) {
-        l = INT_BIT - 5 - f_code;
-        val = (val<<l)>>l;
-    } else {
-        /* horrible h263 long vector mode */
-        if (pred < -31 && val < -63)
-            val += 64;
-        if (pred > 32 && val > 63)
-            val -= 64;
-
-    }
-    return val;
-}
-
-/**
- * gets the average motion vector for a GMC MB.
- * @param n either 0 for the x component or 1 for y
- * @returns the average MV for a GMC MB
- */
-static inline int get_amv(MpegEncContext *s, int n){
-    int x, y, mb_v, sum, dx, dy, shift;
-    int len = 1 << (s->f_code + 4);
-    const int a= s->sprite_warping_accuracy;
-
-    if(s->workaround_bugs & FF_BUG_AMV)
-        len >>= s->quarter_sample;
-
-    if(s->real_sprite_warping_points==1){
-        if(s->divx_version==500 && s->divx_build==413)
-            sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
-        else
-            sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
-    }else{
-        dx= s->sprite_delta[n][0];
-        dy= s->sprite_delta[n][1];
-        shift= s->sprite_shift[0];
-        if(n) dy -= 1<<(shift + a + 1);
-        else  dx -= 1<<(shift + a + 1);
-        mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
-
-        sum=0;
-        for(y=0; y<16; y++){
-            int v;
-
-            v= mb_v + dy*y;
-            //XXX FIXME optimize
-            for(x=0; x<16; x++){
-                sum+= v>>shift;
-                v+= dx;
-            }
-        }
-        sum= RSHIFT(sum, a+8-s->quarter_sample);
-    }
-
-    if      (sum < -len) sum= -len;
-    else if (sum >= len) sum= len-1;
-
-    return sum;
-}
-
-/**
- * decodes the dc value.
- * @param n block index (0-3 are luma, 4-5 are chroma)
- * @param dir_ptr the prediction direction will be stored here
- * @return the quantized dc
- */
-static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
-{
-    int level, code;
-
-    if (n < 4)
-        code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
-    else
-        code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
-    if (code < 0 || code > 9 /* && s->nbit<9 */){
-        av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
-        return -1;
-    }
-    if (code == 0) {
-        level = 0;
-    } else {
-        if(IS_3IV1){
-            if(code==1)
-                level= 2*get_bits1(&s->gb)-1;
-            else{
-                if(get_bits1(&s->gb))
-                    level = get_bits(&s->gb, code-1) + (1<<(code-1));
-                else
-                    level = -get_bits(&s->gb, code-1) - (1<<(code-1));
-            }
-        }else{
-            level = get_xbits(&s->gb, code);
-        }
-
-        if (code > 8){
-            if(get_bits1(&s->gb)==0){ /* marker */
-                if(s->error_recognition>=2){
-                    av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
-                    return -1;
-                }
-            }
-        }
-    }
-
-    return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
-}
-
-/**
- * decodes first partition.
- * @return number of MBs decoded or <0 if an error occurred
- */
-static int mpeg4_decode_partition_a(MpegEncContext *s){
-    int mb_num;
-    static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
-
-    /* decode first partition */
-    mb_num=0;
-    s->first_slice_line=1;
-    for(; s->mb_y<s->mb_height; s->mb_y++){
-        ff_init_block_index(s);
-        for(; s->mb_x<s->mb_width; s->mb_x++){
-            const int xy= s->mb_x + s->mb_y*s->mb_stride;
-            int cbpc;
-            int dir=0;
-
-            mb_num++;
-            ff_update_block_index(s);
-            if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
-                s->first_slice_line=0;
-
-            if(s->pict_type==FF_I_TYPE){
-                int i;
-
-                do{
-                    if(show_bits_long(&s->gb, 19)==DC_MARKER){
-                        return mb_num-1;
-                    }
-
-                    cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
-                    if (cbpc < 0){
-                        av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
-                        return -1;
-                    }
-                }while(cbpc == 8);
-
-                s->cbp_table[xy]= cbpc & 3;
-                s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
-                s->mb_intra = 1;
-
-                if(cbpc & 4) {
-                    ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
-                }
-                s->current_picture.qscale_table[xy]= s->qscale;
-
-                s->mbintra_table[xy]= 1;
-                for(i=0; i<6; i++){
-                    int dc_pred_dir;
-                    int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
-                    if(dc < 0){
-                        av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
-                        return -1;
-                    }
-                    dir<<=1;
-                    if(dc_pred_dir) dir|=1;
-                }
-                s->pred_dir_table[xy]= dir;
-            }else{ /* P/S_TYPE */
-                int mx, my, pred_x, pred_y, bits;
-                int16_t * const mot_val= s->current_picture.motion_val[0][s->block_index[0]];
-                const int stride= s->b8_stride*2;
-
-try_again:
-                bits= show_bits(&s->gb, 17);
-                if(bits==MOTION_MARKER){
-                    return mb_num-1;
-                }
-                skip_bits1(&s->gb);
-                if(bits&0x10000){
-                    /* skip mb */
-                    if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
-                        s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
-                        mx= get_amv(s, 0);
-                        my= get_amv(s, 1);
-                    }else{
-                        s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
-                        mx=my=0;
-                    }
-                    mot_val[0       ]= mot_val[2       ]=
-                    mot_val[0+stride]= mot_val[2+stride]= mx;
-                    mot_val[1       ]= mot_val[3       ]=
-                    mot_val[1+stride]= mot_val[3+stride]= my;
-
-                    if(s->mbintra_table[xy])
-                        ff_clean_intra_table_entries(s);
-                    continue;
-                }
-
-                cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
-                if (cbpc < 0){
-                    av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
-                    return -1;
-                }
-                if(cbpc == 20)
-                    goto try_again;
-
-                s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
-
-                s->mb_intra = ((cbpc & 4) != 0);
-
-                if(s->mb_intra){
-                    s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
-                    s->mbintra_table[xy]= 1;
-                    mot_val[0       ]= mot_val[2       ]=
-                    mot_val[0+stride]= mot_val[2+stride]= 0;
-                    mot_val[1       ]= mot_val[3       ]=
-                    mot_val[1+stride]= mot_val[3+stride]= 0;
-                }else{
-                    if(s->mbintra_table[xy])
-                        ff_clean_intra_table_entries(s);
-
-                    if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
-                        s->mcsel= get_bits1(&s->gb);
-                    else s->mcsel= 0;
-
-                    if ((cbpc & 16) == 0) {
-                        /* 16x16 motion prediction */
-
-                        h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
-                        if(!s->mcsel){
-                            mx = h263_decode_motion(s, pred_x, s->f_code);
-                            if (mx >= 0xffff)
-                                return -1;
-
-                            my = h263_decode_motion(s, pred_y, s->f_code);
-                            if (my >= 0xffff)
-                                return -1;
-                            s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
-                        } else {
-                            mx = get_amv(s, 0);
-                            my = get_amv(s, 1);
-                            s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
-                        }
-
-                        mot_val[0       ]= mot_val[2       ] =
-                        mot_val[0+stride]= mot_val[2+stride]= mx;
-                        mot_val[1       ]= mot_val[3       ]=
-                        mot_val[1+stride]= mot_val[3+stride]= my;
-                    } else {
-                        int i;
-                        s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
-                        for(i=0;i<4;i++) {
-                            int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y);
-                            mx = h263_decode_motion(s, pred_x, s->f_code);
-                            if (mx >= 0xffff)
-                                return -1;
-
-                            my = h263_decode_motion(s, pred_y, s->f_code);
-                            if (my >= 0xffff)
-                                return -1;
-                            mot_val[0] = mx;
-                            mot_val[1] = my;
-                        }
-                    }
-                }
-            }
-        }
-        s->mb_x= 0;
-    }
-
-    return mb_num;
-}
-
-/**
- * decode second partition.
- * @return <0 if an error occurred
- */
-static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
-    int mb_num=0;
-    static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
-
-    s->mb_x= s->resync_mb_x;
-    s->first_slice_line=1;
-    for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
-        ff_init_block_index(s);
-        for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
-            const int xy= s->mb_x + s->mb_y*s->mb_stride;
-
-            mb_num++;
-            ff_update_block_index(s);
-            if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
-                s->first_slice_line=0;
-
-            if(s->pict_type==FF_I_TYPE){
-                int ac_pred= get_bits1(&s->gb);
-                int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-                if(cbpy<0){
-                    av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
-                    return -1;
-                }
-
-                s->cbp_table[xy]|= cbpy<<2;
-                s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
-            }else{ /* P || S_TYPE */
-                if(IS_INTRA(s->current_picture.mb_type[xy])){
-                    int dir=0,i;
-                    int ac_pred = get_bits1(&s->gb);
-                    int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-
-                    if(cbpy<0){
-                        av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
-                        return -1;
-                    }
-
-                    if(s->cbp_table[xy] & 8) {
-                        ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
-                    }
-                    s->current_picture.qscale_table[xy]= s->qscale;
-
-                    for(i=0; i<6; i++){
-                        int dc_pred_dir;
-                        int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
-                        if(dc < 0){
-                            av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
-                            return -1;
-                        }
-                        dir<<=1;
-                        if(dc_pred_dir) dir|=1;
-                    }
-                    s->cbp_table[xy]&= 3; //remove dquant
-                    s->cbp_table[xy]|= cbpy<<2;
-                    s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
-                    s->pred_dir_table[xy]= dir;
-                }else if(IS_SKIP(s->current_picture.mb_type[xy])){
-                    s->current_picture.qscale_table[xy]= s->qscale;
-                    s->cbp_table[xy]= 0;
-                }else{
-                    int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-
-                    if(cbpy<0){
-                        av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
-                        return -1;
-                    }
-
-                    if(s->cbp_table[xy] & 8) {
-                        ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
-                    }
-                    s->current_picture.qscale_table[xy]= s->qscale;
-
-                    s->cbp_table[xy]&= 3; //remove dquant
-                    s->cbp_table[xy]|= (cbpy^0xf)<<2;
-                }
-            }
-        }
-        if(mb_num >= mb_count) return 0;
-        s->mb_x= 0;
-    }
-    return 0;
-}
-
-/**
- * decodes the first & second partition
- * @return <0 if error (and sets error type in the error_status_table)
- */
-int ff_mpeg4_decode_partitions(MpegEncContext *s)
-{
-    int mb_num;
-    const int part_a_error= s->pict_type==FF_I_TYPE ? (DC_ERROR|MV_ERROR) : MV_ERROR;
-    const int part_a_end  = s->pict_type==FF_I_TYPE ? (DC_END  |MV_END)   : MV_END;
-
-    mb_num= mpeg4_decode_partition_a(s);
-    if(mb_num<0){
-        ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
-        return -1;
-    }
-
-    if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
-        av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
-        ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
-        return -1;
-    }
-
-    s->mb_num_left= mb_num;
-
-    if(s->pict_type==FF_I_TYPE){
-        while(show_bits(&s->gb, 9) == 1)
-            skip_bits(&s->gb, 9);
-        if(get_bits_long(&s->gb, 19)!=DC_MARKER){
-            av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
-            return -1;
-        }
-    }else{
-        while(show_bits(&s->gb, 10) == 1)
-            skip_bits(&s->gb, 10);
-        if(get_bits(&s->gb, 17)!=MOTION_MARKER){
-            av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
-            return -1;
-        }
-    }
-    ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
-
-    if( mpeg4_decode_partition_b(s, mb_num) < 0){
-        if(s->pict_type==FF_P_TYPE)
-            ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR);
-        return -1;
-    }else{
-        if(s->pict_type==FF_P_TYPE)
-            ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END);
-    }
-
-    return 0;
-}
-
-/**
- * decodes a block.
- * @return <0 if an error occurred
- */
-static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
-                              int n, int coded, int intra, int rvlc)
-{
-    int level, i, last, run;
-    int dc_pred_dir;
-    RLTable * rl;
-    RL_VLC_ELEM * rl_vlc;
-    const uint8_t * scan_table;
-    int qmul, qadd;
-
-    //Note intra & rvlc should be optimized away if this is inlined
-
-    if(intra) {
-      if(s->use_intra_dc_vlc){
-        /* DC coef */
-        if(s->partitioned_frame){
-            level = s->dc_val[0][ s->block_index[n] ];
-            if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
-            else    level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
-            dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
-        }else{
-            level = mpeg4_decode_dc(s, n, &dc_pred_dir);
-            if (level < 0)
-                return -1;
-        }
-        block[0] = level;
-        i = 0;
-      }else{
-            i = -1;
-            ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
-      }
-      if (!coded)
-          goto not_coded;
-
-      if(rvlc){
-          rl = &rvlc_rl_intra;
-          rl_vlc = rvlc_rl_intra.rl_vlc[0];
-      }else{
-          rl = &rl_intra;
-          rl_vlc = rl_intra.rl_vlc[0];
-      }
-      if (s->ac_pred) {
-          if (dc_pred_dir == 0)
-              scan_table = s->intra_v_scantable.permutated; /* left */
-          else
-              scan_table = s->intra_h_scantable.permutated; /* top */
-      } else {
-            scan_table = s->intra_scantable.permutated;
-      }
-      qmul=1;
-      qadd=0;
-    } else {
-        i = -1;
-        if (!coded) {
-            s->block_last_index[n] = i;
-            return 0;
-        }
-        if(rvlc) rl = &rvlc_rl_inter;
-        else     rl = &rl_inter;
-
-        scan_table = s->intra_scantable.permutated;
-
-        if(s->mpeg_quant){
-            qmul=1;
-            qadd=0;
-            if(rvlc){
-                rl_vlc = rvlc_rl_inter.rl_vlc[0];
-            }else{
-                rl_vlc = rl_inter.rl_vlc[0];
-            }
-        }else{
-            qmul = s->qscale << 1;
-            qadd = (s->qscale - 1) | 1;
-            if(rvlc){
-                rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
-            }else{
-                rl_vlc = rl_inter.rl_vlc[s->qscale];
-            }
-        }
-    }
-  {
-    OPEN_READER(re, &s->gb);
-    for(;;) {
-        UPDATE_CACHE(re, &s->gb);
-        GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
-        if (level==0) {
-          /* escape */
-          if(rvlc){
-                if(SHOW_UBITS(re, &s->gb, 1)==0){
-                    av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
-                    return -1;
-                }; SKIP_CACHE(re, &s->gb, 1);
-
-                last=  SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
-                run=   SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
-                SKIP_COUNTER(re, &s->gb, 1+1+6);
-                UPDATE_CACHE(re, &s->gb);
-
-                if(SHOW_UBITS(re, &s->gb, 1)==0){
-                    av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
-                    return -1;
-                }; SKIP_CACHE(re, &s->gb, 1);
-
-                level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
-
-                if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
-                    av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
-                    return -1;
-                }; SKIP_CACHE(re, &s->gb, 5);
-
-                level=  level * qmul + qadd;
-                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1);
-                SKIP_COUNTER(re, &s->gb, 1+11+5+1);
-
-                i+= run + 1;
-                if(last) i+=192;
-          }else{
-            int cache;
-            cache= GET_CACHE(re, &s->gb);
-
-            if(IS_3IV1)
-                cache ^= 0xC0000000;
-
-            if (cache&0x80000000) {
-                if (cache&0x40000000) {
-                    /* third escape */
-                    SKIP_CACHE(re, &s->gb, 2);
-                    last=  SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
-                    run=   SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
-                    SKIP_COUNTER(re, &s->gb, 2+1+6);
-                    UPDATE_CACHE(re, &s->gb);
-
-                    if(IS_3IV1){
-                        level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
-                    }else{
-                        if(SHOW_UBITS(re, &s->gb, 1)==0){
-                            av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
-                            return -1;
-                        }; SKIP_CACHE(re, &s->gb, 1);
-
-                        level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
-
-                        if(SHOW_UBITS(re, &s->gb, 1)==0){
-                            av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
-                            return -1;
-                        }; LAST_SKIP_CACHE(re, &s->gb, 1);
-
-                        SKIP_COUNTER(re, &s->gb, 1+12+1);
-                    }
-
-#if 0
-                    if(s->error_recognition >= FF_ER_COMPLIANT){
-                        const int abs_level= FFABS(level);
-                        if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
-                            const int run1= run - rl->max_run[last][abs_level] - 1;
-                            if(abs_level <= rl->max_level[last][run]){
-                                av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
-                                return -1;
-                            }
-                            if(s->error_recognition > FF_ER_COMPLIANT){
-                                if(abs_level <= rl->max_level[last][run]*2){
-                                    av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
-                                    return -1;
-                                }
-                                if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
-                                    av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
-                                    return -1;
-                                }
-                            }
-                        }
-                    }
-#endif
-                    if (level>0) level= level * qmul + qadd;
-                    else         level= level * qmul - qadd;
-
-                    if((unsigned)(level + 2048) > 4095){
-                        if(s->error_recognition > FF_ER_COMPLIANT){
-                            if(level > 2560 || level<-2560){
-                                av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
-                                return -1;
-                            }
-                        }
-                        level= level<0 ? -2048 : 2047;
-                    }
-
-                    i+= run + 1;
-                    if(last) i+=192;
-                } else {
-                    /* second escape */
-#if MIN_CACHE_BITS < 20
-                    LAST_SKIP_BITS(re, &s->gb, 2);
-                    UPDATE_CACHE(re, &s->gb);
-#else
-                    SKIP_BITS(re, &s->gb, 2);
-#endif
-                    GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
-                    i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
-                    level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
-                    LAST_SKIP_BITS(re, &s->gb, 1);
-                }
-            } else {
-                /* first escape */
-#if MIN_CACHE_BITS < 19
-                LAST_SKIP_BITS(re, &s->gb, 1);
-                UPDATE_CACHE(re, &s->gb);
-#else
-                SKIP_BITS(re, &s->gb, 1);
-#endif
-                GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
-                i+= run;
-                level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
-                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
-                LAST_SKIP_BITS(re, &s->gb, 1);
-            }
-          }
-        } else {
-            i+= run;
-            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
-            LAST_SKIP_BITS(re, &s->gb, 1);
-        }
-        if (i > 62){
-            i-= 192;
-            if(i&(~63)){
-                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
-                return -1;
-            }
-
-            block[scan_table[i]] = level;
-            break;
-        }
-
-        block[scan_table[i]] = level;
-    }
-    CLOSE_READER(re, &s->gb);
-  }
- not_coded:
-    if (intra) {
-        if(!s->use_intra_dc_vlc){
-            block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
-
-            i -= i>>31; //if(i == -1) i=0;
-        }
-
-        mpeg4_pred_ac(s, block, n, dc_pred_dir);
-        if (s->ac_pred) {
-            i = 63; /* XXX: not optimal */
-        }
-    }
-    s->block_last_index[n] = i;
-    return 0;
-}
-
-/**
- * decode partition C of one MB.
- * @return <0 if an error occurred
- */
-static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
-{
-    int cbp, mb_type;
-    const int xy= s->mb_x + s->mb_y*s->mb_stride;
-
-    mb_type= s->current_picture.mb_type[xy];
-    cbp = s->cbp_table[xy];
-
-    s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
-
-    if(s->current_picture.qscale_table[xy] != s->qscale){
-        ff_set_qscale(s, s->current_picture.qscale_table[xy] );
-    }
-
-    if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) {
-        int i;
-        for(i=0; i<4; i++){
-            s->mv[0][i][0] = s->current_picture.motion_val[0][ s->block_index[i] ][0];
-            s->mv[0][i][1] = s->current_picture.motion_val[0][ s->block_index[i] ][1];
-        }
-        s->mb_intra = IS_INTRA(mb_type);
-
-        if (IS_SKIP(mb_type)) {
-            /* skip mb */
-            for(i=0;i<6;i++)
-                s->block_last_index[i] = -1;
-            s->mv_dir = MV_DIR_FORWARD;
-            s->mv_type = MV_TYPE_16X16;
-            if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
-                s->mcsel=1;
-                s->mb_skipped = 0;
-            }else{
-                s->mcsel=0;
-                s->mb_skipped = 1;
-            }
-        }else if(s->mb_intra){
-            s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
-        }else if(!s->mb_intra){
-//            s->mcsel= 0; //FIXME do we need to init that
-
-            s->mv_dir = MV_DIR_FORWARD;
-            if (IS_8X8(mb_type)) {
-                s->mv_type = MV_TYPE_8X8;
-            } else {
-                s->mv_type = MV_TYPE_16X16;
-            }
-        }
-    } else { /* I-Frame */
-        s->mb_intra = 1;
-        s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
-    }
-
-    if (!IS_SKIP(mb_type)) {
-        int i;
-        s->dsp.clear_blocks(s->block[0]);
-        /* decode each block */
-        for (i = 0; i < 6; i++) {
-            if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
-                av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
-                return -1;
-            }
-            cbp+=cbp;
-        }
-    }
-
-    /* per-MB end of slice check */
-
-    if(--s->mb_num_left <= 0){
-        if(mpeg4_is_resync(s))
-            return SLICE_END;
-        else
-            return SLICE_NOEND;
-    }else{
-        if(mpeg4_is_resync(s)){
-            const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
-            if(s->cbp_table[xy+delta])
-                return SLICE_END;
-        }
-        return SLICE_OK;
-    }
-}
-
-/* Decodes RVLC of H.263+ UMV */
-static int h263p_decode_umotion(MpegEncContext * s, int pred)
-{
-   int code = 0, sign;
-
-   if (get_bits1(&s->gb)) /* Motion difference = 0 */
-      return pred;
-
-   code = 2 + get_bits1(&s->gb);
-
-   while (get_bits1(&s->gb))
-   {
-      code <<= 1;
-      code += get_bits1(&s->gb);
-   }
-   sign = code & 1;
-   code >>= 1;
-
-   code = (sign) ? (pred - code) : (pred + code);
-   dprintf(s->avctx,"H.263+ UMV Motion = %d\n", code);
-   return code;
-
-}
-
-/**
- * read the next MVs for OBMC. yes this is a ugly hack, feel free to send a patch :)
- */
-static void preview_obmc(MpegEncContext *s){
-    GetBitContext gb= s->gb;
-
-    int cbpc, i, pred_x, pred_y, mx, my;
-    int16_t *mot_val;
-    const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
-    const int stride= s->b8_stride*2;
-
-    for(i=0; i<4; i++)
-        s->block_index[i]+= 2;
-    for(i=4; i<6; i++)
-        s->block_index[i]+= 1;
-    s->mb_x++;
-
-    assert(s->pict_type == FF_P_TYPE);
-
-    do{
-        if (get_bits1(&s->gb)) {
-            /* skip mb */
-            mot_val = s->current_picture.motion_val[0][ s->block_index[0] ];
-            mot_val[0       ]= mot_val[2       ]=
-            mot_val[0+stride]= mot_val[2+stride]= 0;
-            mot_val[1       ]= mot_val[3       ]=
-            mot_val[1+stride]= mot_val[3+stride]= 0;
-
-            s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
-            goto end;
-        }
-        cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
-    }while(cbpc == 20);
-
-    if(cbpc & 4){
-        s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
-    }else{
-        get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-        if (cbpc & 8) {
-            if(s->modified_quant){
-                if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
-                else                  skip_bits(&s->gb, 5);
-            }else
-                skip_bits(&s->gb, 2);
-        }
-
-        if ((cbpc & 16) == 0) {
-                s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
-                /* 16x16 motion prediction */
-                mot_val= h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
-                if (s->umvplus)
-                   mx = h263p_decode_umotion(s, pred_x);
-                else
-                   mx = h263_decode_motion(s, pred_x, 1);
-
-                if (s->umvplus)
-                   my = h263p_decode_umotion(s, pred_y);
-                else
-                   my = h263_decode_motion(s, pred_y, 1);
-
-                mot_val[0       ]= mot_val[2       ]=
-                mot_val[0+stride]= mot_val[2+stride]= mx;
-                mot_val[1       ]= mot_val[3       ]=
-                mot_val[1+stride]= mot_val[3+stride]= my;
-        } else {
-            s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
-            for(i=0;i<4;i++) {
-                mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
-                if (s->umvplus)
-                  mx = h263p_decode_umotion(s, pred_x);
-                else
-                  mx = h263_decode_motion(s, pred_x, 1);
-
-                if (s->umvplus)
-                  my = h263p_decode_umotion(s, pred_y);
-                else
-                  my = h263_decode_motion(s, pred_y, 1);
-                if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
-                  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
-                mot_val[0] = mx;
-                mot_val[1] = my;
-            }
-        }
-    }
-end:
-
-    for(i=0; i<4; i++)
-        s->block_index[i]-= 2;
-    for(i=4; i<6; i++)
-        s->block_index[i]-= 1;
-    s->mb_x--;
-
-    s->gb= gb;
-}
-
-static void h263_decode_dquant(MpegEncContext *s){
-    static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
-
-    if(s->modified_quant){
-        if(get_bits1(&s->gb))
-            s->qscale= modified_quant_tab[get_bits1(&s->gb)][ s->qscale ];
-        else
-            s->qscale= get_bits(&s->gb, 5);
-    }else
-        s->qscale += quant_tab[get_bits(&s->gb, 2)];
-    ff_set_qscale(s, s->qscale);
-}
-
-static int h263_decode_block(MpegEncContext * s, DCTELEM * block,
-                             int n, int coded)
-{
-    int code, level, i, j, last, run;
-    RLTable *rl = &rl_inter;
-    const uint8_t *scan_table;
-    GetBitContext gb= s->gb;
-
-    scan_table = s->intra_scantable.permutated;
-    if (s->h263_aic && s->mb_intra) {
-        rl = &rl_intra_aic;
-        i = 0;
-        if (s->ac_pred) {
-            if (s->h263_aic_dir)
-                scan_table = s->intra_v_scantable.permutated; /* left */
-            else
-                scan_table = s->intra_h_scantable.permutated; /* top */
-        }
-    } else if (s->mb_intra) {
-        /* DC coef */
-        if(s->codec_id == CODEC_ID_RV10){
-#if CONFIG_RV10_DECODER
-          if (s->rv10_version == 3 && s->pict_type == FF_I_TYPE) {
-            int component, diff;
-            component = (n <= 3 ? 0 : n - 4 + 1);
-            level = s->last_dc[component];
-            if (s->rv10_first_dc_coded[component]) {
-                diff = rv_decode_dc(s, n);
-                if (diff == 0xffff)
-                    return -1;
-                level += diff;
-                level = level & 0xff; /* handle wrap round */
-                s->last_dc[component] = level;
-            } else {
-                s->rv10_first_dc_coded[component] = 1;
-            }
-          } else {
-                level = get_bits(&s->gb, 8);
-                if (level == 255)
-                    level = 128;
-          }
-#endif
-        }else{
-            level = get_bits(&s->gb, 8);
-            if((level&0x7F) == 0){
-                av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
-                if(s->error_recognition >= FF_ER_COMPLIANT)
-                    return -1;
-            }
-            if (level == 255)
-                level = 128;
-        }
-        block[0] = level;
-        i = 1;
-    } else {
-        i = 0;
-    }
-    if (!coded) {
-        if (s->mb_intra && s->h263_aic)
-            goto not_coded;
-        s->block_last_index[n] = i - 1;
-        return 0;
-    }
-retry:
-    for(;;) {
-        code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
-        if (code < 0){
-            av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
-            return -1;
-        }
-        if (code == rl->n) {
-            /* escape */
-            if (s->h263_flv > 1) {
-                int is11 = get_bits1(&s->gb);
-                last = get_bits1(&s->gb);
-                run = get_bits(&s->gb, 6);
-                if(is11){
-                    level = get_sbits(&s->gb, 11);
-                } else {
-                    level = get_sbits(&s->gb, 7);
-                }
-            } else {
-                last = get_bits1(&s->gb);
-                run = get_bits(&s->gb, 6);
-                level = (int8_t)get_bits(&s->gb, 8);
-                if(level == -128){
-                    if (s->codec_id == CODEC_ID_RV10) {
-                        /* XXX: should patch encoder too */
-                        level = get_sbits(&s->gb, 12);
-                    }else{
-                        level = get_bits(&s->gb, 5);
-                        level |= get_sbits(&s->gb, 6)<<5;
-                    }
-                }
-            }
-        } else {
-            run = rl->table_run[code];
-            level = rl->table_level[code];
-            last = code >= rl->last;
-            if (get_bits1(&s->gb))
-                level = -level;
-        }
-        i += run;
-        if (i >= 64){
-            if(s->alt_inter_vlc && rl == &rl_inter && !s->mb_intra){
-                //Looks like a hack but no, it's the way it is supposed to work ...
-                rl = &rl_intra_aic;
-                i = 0;
-                s->gb= gb;
-                s->dsp.clear_block(block);
-                goto retry;
-            }
-            av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
-            return -1;
-        }
-        j = scan_table[i];
-        block[j] = level;
-        if (last)
-            break;
-        i++;
-    }
-not_coded:
-    if (s->mb_intra && s->h263_aic) {
-        h263_pred_acdc(s, block, n);
-        i = 63;
-    }
-    s->block_last_index[n] = i;
-    return 0;
-}
-
-static int h263_skip_b_part(MpegEncContext *s, int cbp)
-{
-    DECLARE_ALIGNED(16, DCTELEM, dblock[64]);
-    int i, mbi;
-
-    /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
-     * but real value should be restored in order to be used later (in OBMC condition)
-     */
-    mbi = s->mb_intra;
-    s->mb_intra = 0;
-    for (i = 0; i < 6; i++) {
-        if (h263_decode_block(s, dblock, i, cbp&32) < 0)
-            return -1;
-        cbp+=cbp;
-    }
-    s->mb_intra = mbi;
-    return 0;
-}
-
-static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
-{
-    int c, mv = 1;
-
-    if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
-        c = get_bits1(gb);
-        if (pb_frame == 2 && c)
-            mv = !get_bits1(gb);
-    } else { // h.263 Annex M improved PB-frame
-        mv = get_unary(gb, 0, 4) + 1;
-        c = mv & 1;
-        mv = !!(mv & 2);
-    }
-    if(c)
-        *cbpb = get_bits(gb, 6);
-    return mv;
-}
-
-int ff_h263_decode_mb(MpegEncContext *s,
-                      DCTELEM block[6][64])
-{
-    int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
-    int16_t *mot_val;
-    const int xy= s->mb_x + s->mb_y * s->mb_stride;
-    int cbpb = 0, pb_mv_count = 0;
-
-    assert(!s->h263_pred);
-
-    if (s->pict_type == FF_P_TYPE) {
-        do{
-            if (get_bits1(&s->gb)) {
-                /* skip mb */
-                s->mb_intra = 0;
-                for(i=0;i<6;i++)
-                    s->block_last_index[i] = -1;
-                s->mv_dir = MV_DIR_FORWARD;
-                s->mv_type = MV_TYPE_16X16;
-                s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
-                s->mv[0][0][0] = 0;
-                s->mv[0][0][1] = 0;
-                s->mb_skipped = !(s->obmc | s->loop_filter);
-                goto end;
-            }
-            cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
-            if (cbpc < 0){
-                av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
-                return -1;
-            }
-        }while(cbpc == 20);
-
-        s->dsp.clear_blocks(s->block[0]);
-
-        dquant = cbpc & 8;
-        s->mb_intra = ((cbpc & 4) != 0);
-        if (s->mb_intra) goto intra;
-
-        if(s->pb_frame && get_bits1(&s->gb))
-            pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
-        cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-
-        if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
-            cbpy ^= 0xF;
-
-        cbp = (cbpc & 3) | (cbpy << 2);
-        if (dquant) {
-            h263_decode_dquant(s);
-        }
-
-        s->mv_dir = MV_DIR_FORWARD;
-        if ((cbpc & 16) == 0) {
-            s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
-            /* 16x16 motion prediction */
-            s->mv_type = MV_TYPE_16X16;
-            h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
-            if (s->umvplus)
-               mx = h263p_decode_umotion(s, pred_x);
-            else
-               mx = h263_decode_motion(s, pred_x, 1);
-
-            if (mx >= 0xffff)
-                return -1;
-
-            if (s->umvplus)
-               my = h263p_decode_umotion(s, pred_y);
-            else
-               my = h263_decode_motion(s, pred_y, 1);
-
-            if (my >= 0xffff)
-                return -1;
-            s->mv[0][0][0] = mx;
-            s->mv[0][0][1] = my;
-
-            if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
-               skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
-        } else {
-            s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
-            s->mv_type = MV_TYPE_8X8;
-            for(i=0;i<4;i++) {
-                mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
-                if (s->umvplus)
-                  mx = h263p_decode_umotion(s, pred_x);
-                else
-                  mx = h263_decode_motion(s, pred_x, 1);
-                if (mx >= 0xffff)
-                    return -1;
-
-                if (s->umvplus)
-                  my = h263p_decode_umotion(s, pred_y);
-                else
-                  my = h263_decode_motion(s, pred_y, 1);
-                if (my >= 0xffff)
-                    return -1;
-                s->mv[0][i][0] = mx;
-                s->mv[0][i][1] = my;
-                if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
-                  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
-                mot_val[0] = mx;
-                mot_val[1] = my;
-            }
-        }
-    } else if(s->pict_type==FF_B_TYPE) {
-        int mb_type;
-        const int stride= s->b8_stride;
-        int16_t *mot_val0 = s->current_picture.motion_val[0][ 2*(s->mb_x + s->mb_y*stride) ];
-        int16_t *mot_val1 = s->current_picture.motion_val[1][ 2*(s->mb_x + s->mb_y*stride) ];
-//        const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
-
-        //FIXME ugly
-        mot_val0[0       ]= mot_val0[2       ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
-        mot_val0[1       ]= mot_val0[3       ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
-        mot_val1[0       ]= mot_val1[2       ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
-        mot_val1[1       ]= mot_val1[3       ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
-
-        do{
-            mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
-            if (mb_type < 0){
-                av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
-                return -1;
-            }
-
-            mb_type= h263_mb_type_b_map[ mb_type ];
-        }while(!mb_type);
-
-        s->mb_intra = IS_INTRA(mb_type);
-        if(HAS_CBP(mb_type)){
-            s->dsp.clear_blocks(s->block[0]);
-            cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
-            if(s->mb_intra){
-                dquant = IS_QUANT(mb_type);
-                goto intra;
-            }
-
-            cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-
-            if (cbpy < 0){
-                av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
-                return -1;
-            }
-
-            if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
-                cbpy ^= 0xF;
-
-            cbp = (cbpc & 3) | (cbpy << 2);
-        }else
-            cbp=0;
-
-        assert(!s->mb_intra);
-
-        if(IS_QUANT(mb_type)){
-            h263_decode_dquant(s);
-        }
-
-        if(IS_DIRECT(mb_type)){
-            s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
-            mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0);
-        }else{
-            s->mv_dir = 0;
-            s->mv_type= MV_TYPE_16X16;
-//FIXME UMV
-
-            if(USES_LIST(mb_type, 0)){
-                int16_t *mot_val= h263_pred_motion(s, 0, 0, &mx, &my);
-                s->mv_dir = MV_DIR_FORWARD;
-
-                mx = h263_decode_motion(s, mx, 1);
-                my = h263_decode_motion(s, my, 1);
-
-                s->mv[0][0][0] = mx;
-                s->mv[0][0][1] = my;
-                mot_val[0       ]= mot_val[2       ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
-                mot_val[1       ]= mot_val[3       ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
-            }
-
-            if(USES_LIST(mb_type, 1)){
-                int16_t *mot_val= h263_pred_motion(s, 0, 1, &mx, &my);
-                s->mv_dir |= MV_DIR_BACKWARD;
-
-                mx = h263_decode_motion(s, mx, 1);
-                my = h263_decode_motion(s, my, 1);
-
-                s->mv[1][0][0] = mx;
-                s->mv[1][0][1] = my;
-                mot_val[0       ]= mot_val[2       ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
-                mot_val[1       ]= mot_val[3       ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
-            }
-        }
-
-        s->current_picture.mb_type[xy]= mb_type;
-    } else { /* I-Frame */
-        do{
-            cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
-            if (cbpc < 0){
-                av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
-                return -1;
-            }
-        }while(cbpc == 8);
-
-        s->dsp.clear_blocks(s->block[0]);
-
-        dquant = cbpc & 4;
-        s->mb_intra = 1;
-intra:
-        s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
-        if (s->h263_aic) {
-            s->ac_pred = get_bits1(&s->gb);
-            if(s->ac_pred){
-                s->current_picture.mb_type[xy]= MB_TYPE_INTRA | MB_TYPE_ACPRED;
-
-                s->h263_aic_dir = get_bits1(&s->gb);
-            }
-        }else
-            s->ac_pred = 0;
-
-        if(s->pb_frame && get_bits1(&s->gb))
-            pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
-        cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-        if(cbpy<0){
-            av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
-            return -1;
-        }
-        cbp = (cbpc & 3) | (cbpy << 2);
-        if (dquant) {
-            h263_decode_dquant(s);
-        }
-
-        pb_mv_count += !!s->pb_frame;
-    }
-
-    while(pb_mv_count--){
-        h263_decode_motion(s, 0, 1);
-        h263_decode_motion(s, 0, 1);
-    }
-
-    /* decode each block */
-    for (i = 0; i < 6; i++) {
-        if (h263_decode_block(s, block[i], i, cbp&32) < 0)
-            return -1;
-        cbp+=cbp;
-    }
-
-    if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
-        return -1;
-    if(s->obmc && !s->mb_intra){
-        if(s->pict_type == FF_P_TYPE && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
-            preview_obmc(s);
-    }
-end:
-
-        /* per-MB end of slice check */
-    {
-        int v= show_bits(&s->gb, 16);
-
-        if(get_bits_count(&s->gb) + 16 > s->gb.size_in_bits){
-            v>>= get_bits_count(&s->gb) + 16 - s->gb.size_in_bits;
-        }
-
-        if(v==0)
-            return SLICE_END;
-    }
-
-    return SLICE_OK;
-}
-
-int ff_mpeg4_decode_mb(MpegEncContext *s,
-                      DCTELEM block[6][64])
-{
-    int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
-    int16_t *mot_val;
-    static int8_t quant_tab[4] = { -1, -2, 1, 2 };
-    const int xy= s->mb_x + s->mb_y * s->mb_stride;
-
-    assert(s->h263_pred);
-
-    if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) {
-        do{
-            if (get_bits1(&s->gb)) {
-                /* skip mb */
-                s->mb_intra = 0;
-                for(i=0;i<6;i++)
-                    s->block_last_index[i] = -1;
-                s->mv_dir = MV_DIR_FORWARD;
-                s->mv_type = MV_TYPE_16X16;
-                if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
-                    s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
-                    s->mcsel=1;
-                    s->mv[0][0][0]= get_amv(s, 0);
-                    s->mv[0][0][1]= get_amv(s, 1);
-
-                    s->mb_skipped = 0;
-                }else{
-                    s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
-                    s->mcsel=0;
-                    s->mv[0][0][0] = 0;
-                    s->mv[0][0][1] = 0;
-                    s->mb_skipped = 1;
-                }
-                goto end;
-            }
-            cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
-            if (cbpc < 0){
-                av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
-                return -1;
-            }
-        }while(cbpc == 20);
-
-        s->dsp.clear_blocks(s->block[0]);
-        dquant = cbpc & 8;
-        s->mb_intra = ((cbpc & 4) != 0);
-        if (s->mb_intra) goto intra;
-
-        if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
-            s->mcsel= get_bits1(&s->gb);
-        else s->mcsel= 0;
-        cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
-
-        cbp = (cbpc & 3) | (cbpy << 2);
-        if (dquant) {
-            ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
-        }
-        if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
-            s->interlaced_dct= get_bits1(&s->gb);
-
-        s->mv_dir = MV_DIR_FORWARD;
-        if ((cbpc & 16) == 0) {
-            if(s->mcsel){
-                s->current_picture.mb_type[xy]= MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
-                /* 16x16 global motion prediction */
-                s->mv_type = MV_TYPE_16X16;
-                mx= get_amv(s, 0);
-                my= get_amv(s, 1);
-                s->mv[0][0][0] = mx;
-                s->mv[0][0][1] = my;
-            }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
-                s->current_picture.mb_type[xy]= MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
-                /* 16x8 field motion prediction */
-                s->mv_type= MV_TYPE_FIELD;
-
-                s->field_select[0][0]= get_bits1(&s->gb);
-                s->field_select[0][1]= get_bits1(&s->gb);
-
-                h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
-
-                for(i=0; i<2; i++){
-                    mx = h263_decode_motion(s, pred_x, s->f_code);
-                    if (mx >= 0xffff)
-                        return -1;
-
-                    my = h263_decode_motion(s, pred_y/2, s->f_code);
-                    if (my >= 0xffff)
-                        return -1;
-
-                    s->mv[0][i][0] = mx;
-                    s->mv[0][i][1] = my;
-                }
-            }else{
-                s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
-                /* 16x16 motion prediction */
-                s->mv_type = MV_TYPE_16X16;
-                h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
-                mx = h263_decode_motion(s, pred_x, s->f_code);
-
-                if (mx >= 0xffff)
-                    return -1;
-
-                my = h263_decode_motion(s, pred_y, s->f_code);
-
-                if (my >= 0xffff)
-                    return -1;
-                s->mv[0][0][0] = mx;
-                s->mv[0][0][1] = my;
-            }
-        } else {
-            s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
-            s->mv_type = MV_TYPE_8X8;
-            for(i=0;i<4;i++) {
-                mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
-                mx = h263_decode_motion(s, pred_x, s->f_code);
-                if (mx >= 0xffff)
-                    return -1;
-
-                my = h263_decode_motion(s, pred_y, s->f_code);
-                if (my >= 0xffff)
-                    return -1;
-                s->mv[0][i][0] = mx;
-                s->mv[0][i][1] = my;
-                mot_val[0] = mx;
-                mot_val[1] = my;
-            }
-        }
-    } else if(s->pict_type==FF_B_TYPE) {
-        int modb1; // first bit of modb
-        int modb2; // second bit of modb
-        int mb_type;
-
-        s->mb_intra = 0; //B-frames never contain intra blocks
-        s->mcsel=0;      //     ...               true gmc blocks
-
-        if(s->mb_x==0){
-            for(i=0; i<2; i++){
-                s->last_mv[i][0][0]=
-                s->last_mv[i][0][1]=
-                s->last_mv[i][1][0]=
-                s->last_mv[i][1][1]= 0;
-            }
-        }
-
-        /* if we skipped it in the future P Frame than skip it now too */
-        s->mb_skipped= s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
-
-        if(s->mb_skipped){
-                /* skip mb */
-            for(i=0;i<6;i++)
-                s->block_last_index[i] = -1;
-
-            s->mv_dir = MV_DIR_FORWARD;
-            s->mv_type = MV_TYPE_16X16;
-            s->mv[0][0][0] = 0;
-            s->mv[0][0][1] = 0;
-            s->mv[1][0][0] = 0;
-            s->mv[1][0][1] = 0;
-            s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
-            goto end;
-        }
-
-        modb1= get_bits1(&s->gb);
-        if(modb1){
-            mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
-            cbp=0;
-        }else{
-            modb2= get_bits1(&s->gb);
-            mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
-            if(mb_type<0){
-                av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
-                return -1;
-            }
-            mb_type= mb_type_b_map[ mb_type ];
-            if(modb2) cbp= 0;
-            else{
-                s->dsp.clear_blocks(s->block[0]);
-                cbp= get_bits(&s->gb, 6);
-            }
-
-            if ((!IS_DIRECT(mb_type)) && cbp) {
-                if(get_bits1(&s->gb)){
-                    ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
-                }
-            }
-
-            if(!s->progressive_sequence){
-                if(cbp)
-                    s->interlaced_dct= get_bits1(&s->gb);
-
-                if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
-                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
-                    mb_type &= ~MB_TYPE_16x16;
-
-                    if(USES_LIST(mb_type, 0)){
-                        s->field_select[0][0]= get_bits1(&s->gb);
-                        s->field_select[0][1]= get_bits1(&s->gb);
-                    }
-                    if(USES_LIST(mb_type, 1)){
-                        s->field_select[1][0]= get_bits1(&s->gb);
-                        s->field_select[1][1]= get_bits1(&s->gb);
-                    }
-                }
-            }
-
-            s->mv_dir = 0;
-            if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
-                s->mv_type= MV_TYPE_16X16;
-
-                if(USES_LIST(mb_type, 0)){
-                    s->mv_dir = MV_DIR_FORWARD;
-
-                    mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
-                    my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
-                    s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
-                    s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
-                }
-
-                if(USES_LIST(mb_type, 1)){
-                    s->mv_dir |= MV_DIR_BACKWARD;
-
-                    mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
-                    my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
-                    s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
-                    s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
-                }
-            }else if(!IS_DIRECT(mb_type)){
-                s->mv_type= MV_TYPE_FIELD;
-
-                if(USES_LIST(mb_type, 0)){
-                    s->mv_dir = MV_DIR_FORWARD;
-
-                    for(i=0; i<2; i++){
-                        mx = h263_decode_motion(s, s->last_mv[0][i][0]  , s->f_code);
-                        my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
-                        s->last_mv[0][i][0]=  s->mv[0][i][0] = mx;
-                        s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
-                    }
-                }
-
-                if(USES_LIST(mb_type, 1)){
-                    s->mv_dir |= MV_DIR_BACKWARD;
-
-                    for(i=0; i<2; i++){
-                        mx = h263_decode_motion(s, s->last_mv[1][i][0]  , s->b_code);
-                        my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
-                        s->last_mv[1][i][0]=  s->mv[1][i][0] = mx;
-                        s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
-                    }
-                }
-            }
-        }
-
-        if(IS_DIRECT(mb_type)){
-            if(IS_SKIP(mb_type))
-                mx=my=0;
-            else{
-                mx = h263_decode_motion(s, 0, 1);
-                my = h263_decode_motion(s, 0, 1);
-            }
-
-            s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
-            mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
-        }
-        s->current_picture.mb_type[xy]= mb_type;
-    } else { /* I-Frame */
-        do{
-            cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
-            if (cbpc < 0){
-                av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
-                return -1;
-            }
-        }while(cbpc == 8);
-
-        dquant = cbpc & 4;
-        s->mb_intra = 1;
-intra:
-        s->ac_pred = get_bits1(&s->gb);
-        if(s->ac_pred)
-            s->current_picture.mb_type[xy]= MB_TYPE_INTRA | MB_TYPE_ACPRED;
-        else
-            s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
-
-        cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
-        if(cbpy<0){
-            av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
-            return -1;
-        }
-        cbp = (cbpc & 3) | (cbpy << 2);
-
-        s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
-
-        if (dquant) {
-            ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
-        }
-
-        if(!s->progressive_sequence)
-            s->interlaced_dct= get_bits1(&s->gb);
-
-        s->dsp.clear_blocks(s->block[0]);
-        /* decode each block */
-        for (i = 0; i < 6; i++) {
-            if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
-                return -1;
-            cbp+=cbp;
-        }
-        goto end;
-    }
-
-    /* decode each block */
-    for (i = 0; i < 6; i++) {
-        if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
-            return -1;
-        cbp+=cbp;
-    }
-end:
-
-        /* per-MB end of slice check */
-    if(s->codec_id==CODEC_ID_MPEG4){
-        if(mpeg4_is_resync(s)){
-            const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
-            if(s->pict_type==FF_B_TYPE && s->next_picture.mbskip_table[xy + delta])
-                return SLICE_OK;
-            return SLICE_END;
-        }
-    }
-
-    return SLICE_OK;
-}
-
-/* most is hardcoded. should extend to handle all h263 streams */
-int h263_decode_picture_header(MpegEncContext *s)
-{
-    int format, width, height, i;
-    uint32_t startcode;
-
-    align_get_bits(&s->gb);
-
-    startcode= get_bits(&s->gb, 22-8);
-
-    for(i= get_bits_left(&s->gb); i>24; i-=8) {
-        startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
-
-        if(startcode == 0x20)
-            break;
-    }
-
-    if (startcode != 0x20) {
-        av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
-        return -1;
-    }
-    /* temporal reference */
-    i = get_bits(&s->gb, 8); /* picture timestamp */
-    if( (s->picture_number&~0xFF)+i < s->picture_number)
-        i+= 256;
-    s->current_picture_ptr->pts=
-    s->picture_number= (s->picture_number&~0xFF) + i;
-
-    /* PTYPE starts here */
-    if (get_bits1(&s->gb) != 1) {
-        /* marker */
-        av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
-        return -1;
-    }
-    if (get_bits1(&s->gb) != 0) {
-        av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
-        return -1;      /* h263 id */
-    }
-    skip_bits1(&s->gb);         /* split screen off */
-    skip_bits1(&s->gb);         /* camera  off */
-    skip_bits1(&s->gb);         /* freeze picture release off */
-
-    format = get_bits(&s->gb, 3);
-    /*
-        0    forbidden
-        1    sub-QCIF
-        10   QCIF
-        7       extended PTYPE (PLUSPTYPE)
-    */
-
-    if (format != 7 && format != 6) {
-        s->h263_plus = 0;
-        /* H.263v1 */
-        width = h263_format[format][0];
-        height = h263_format[format][1];
-        if (!width)
-            return -1;
-
-        s->pict_type = FF_I_TYPE + get_bits1(&s->gb);
-
-        s->h263_long_vectors = get_bits1(&s->gb);
-
-        if (get_bits1(&s->gb) != 0) {
-            av_log(s->avctx, AV_LOG_ERROR, "H263 SAC not supported\n");
-            return -1; /* SAC: off */
-        }
-        s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
-        s->unrestricted_mv = s->h263_long_vectors || s->obmc;
-
-        s->pb_frame = get_bits1(&s->gb);
-        s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
-        skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
-
-        s->width = width;
-        s->height = height;
-        s->avctx->sample_aspect_ratio= (AVRational){12,11};
-        s->avctx->time_base= (AVRational){1001, 30000};
-    } else {
-        int ufep;
-
-        /* H.263v2 */
-        s->h263_plus = 1;
-        ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
-
-        /* ufep other than 0 and 1 are reserved */
-        if (ufep == 1) {
-            /* OPPTYPE */
-            format = get_bits(&s->gb, 3);
-            dprintf(s->avctx, "ufep=1, format: %d\n", format);
-            s->custom_pcf= get_bits1(&s->gb);
-            s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
-            if (get_bits1(&s->gb) != 0) {
-                av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
-            }
-            s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
-            s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
-            s->loop_filter= get_bits1(&s->gb);
-            s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
-
-            s->h263_slice_structured= get_bits1(&s->gb);
-            if (get_bits1(&s->gb) != 0) {
-                av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
-            }
-            if (get_bits1(&s->gb) != 0) {
-                av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
-            }
-            s->alt_inter_vlc= get_bits1(&s->gb);
-            s->modified_quant= get_bits1(&s->gb);
-            if(s->modified_quant)
-                s->chroma_qscale_table= ff_h263_chroma_qscale_table;
-
-            skip_bits(&s->gb, 1); /* Prevent start code emulation */
-
-            skip_bits(&s->gb, 3); /* Reserved */
-        } else if (ufep != 0) {
-            av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
-            return -1;
-        }
-
-        /* MPPTYPE */
-        s->pict_type = get_bits(&s->gb, 3);
-        switch(s->pict_type){
-        case 0: s->pict_type= FF_I_TYPE;break;
-        case 1: s->pict_type= FF_P_TYPE;break;
-        case 2: s->pict_type= FF_P_TYPE;s->pb_frame = 3;break;
-        case 3: s->pict_type= FF_B_TYPE;break;
-        case 7: s->pict_type= FF_I_TYPE;break; //ZYGO
-        default:
-            return -1;
-        }
-        skip_bits(&s->gb, 2);
-        s->no_rounding = get_bits1(&s->gb);
-        skip_bits(&s->gb, 4);
-
-        /* Get the picture dimensions */
-        if (ufep) {
-            if (format == 6) {
-                /* Custom Picture Format (CPFMT) */
-                s->aspect_ratio_info = get_bits(&s->gb, 4);
-                dprintf(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
-                /* aspect ratios:
-                0 - forbidden
-                1 - 1:1
-                2 - 12:11 (CIF 4:3)
-                3 - 10:11 (525-type 4:3)
-                4 - 16:11 (CIF 16:9)
-                5 - 40:33 (525-type 16:9)
-                6-14 - reserved
-                */
-                width = (get_bits(&s->gb, 9) + 1) * 4;
-                skip_bits1(&s->gb);
-                height = get_bits(&s->gb, 9) * 4;
-                dprintf(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
-                if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
-                    /* aspected dimensions */
-                    s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
-                    s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
-                }else{
-                    s->avctx->sample_aspect_ratio= pixel_aspect[s->aspect_ratio_info];
-                }
-            } else {
-                width = h263_format[format][0];
-                height = h263_format[format][1];
-                s->avctx->sample_aspect_ratio= (AVRational){12,11};
-            }
-            if ((width == 0) || (height == 0))
-                return -1;
-            s->width = width;
-            s->height = height;
-
-            if(s->custom_pcf){
-                int gcd;
-                s->avctx->time_base.den= 1800000;
-                s->avctx->time_base.num= 1000 + get_bits1(&s->gb);
-                s->avctx->time_base.num*= get_bits(&s->gb, 7);
-                if(s->avctx->time_base.num == 0){
-                    av_log(s, AV_LOG_ERROR, "zero framerate\n");
-                    return -1;
-                }
-                gcd= av_gcd(s->avctx->time_base.den, s->avctx->time_base.num);
-                s->avctx->time_base.den /= gcd;
-                s->avctx->time_base.num /= gcd;
-            }else{
-                s->avctx->time_base= (AVRational){1001, 30000};
-            }
-        }
-
-        if(s->custom_pcf){
-            skip_bits(&s->gb, 2); //extended Temporal reference
-        }
-
-        if (ufep) {
-            if (s->umvplus) {
-                if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
-                    skip_bits1(&s->gb);
-            }
-            if(s->h263_slice_structured){
-                if (get_bits1(&s->gb) != 0) {
-                    av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
-                }
-                if (get_bits1(&s->gb) != 0) {
-                    av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
-                }
-            }
-        }
-
-        s->qscale = get_bits(&s->gb, 5);
-    }
-
-    s->mb_width = (s->width  + 15) / 16;
-    s->mb_height = (s->height  + 15) / 16;
-    s->mb_num = s->mb_width * s->mb_height;
-
-    if (s->pb_frame) {
-        skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
-        if (s->custom_pcf)
-            skip_bits(&s->gb, 2); //extended Temporal reference
-        skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
-    }
-
-    /* PEI */
-    while (get_bits1(&s->gb) != 0) {
-        skip_bits(&s->gb, 8);
-    }
-
-    if(s->h263_slice_structured){
-        if (get_bits1(&s->gb) != 1) {
-            av_log(s->avctx, AV_LOG_ERROR, "SEPB1 marker missing\n");
-            return -1;
-        }
-
-        ff_h263_decode_mba(s);
-
-        if (get_bits1(&s->gb) != 1) {
-            av_log(s->avctx, AV_LOG_ERROR, "SEPB2 marker missing\n");
-            return -1;
-        }
-    }
-    s->f_code = 1;
-
-    if(s->h263_aic){
-         s->y_dc_scale_table=
-         s->c_dc_scale_table= ff_aic_dc_scale_table;
-    }else{
-        s->y_dc_scale_table=
-        s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
-    }
-
-     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
-        show_pict_info(s);
-     }
-    if (s->pict_type == FF_I_TYPE && s->codec_tag == AV_RL32("ZYGO")){
-        int i,j;
-        for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
-        av_log(s->avctx, AV_LOG_DEBUG, "\n");
-        for(i=0; i<13; i++){
-            for(j=0; j<3; j++){
-                int v= get_bits(&s->gb, 8);
-                v |= get_sbits(&s->gb, 8)<<8;
-                av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
-            }
-            av_log(s->avctx, AV_LOG_DEBUG, "\n");
-        }
-        for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
-    }
-
-    return 0;
-}
-
-static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
-    int hours, minutes, seconds;
-
-    hours= get_bits(gb, 5);
-    minutes= get_bits(gb, 6);
-    skip_bits1(gb);
-    seconds= get_bits(gb, 6);
-
-    s->time_base= seconds + 60*(minutes + 60*hours);
-
-    skip_bits1(gb);
-    skip_bits1(gb);
-
-    return 0;
-}
-
-static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
-    int width, height, vo_ver_id;
-
-    /* vol header */
-    skip_bits(gb, 1); /* random access */
-    s->vo_type= get_bits(gb, 8);
-    if (get_bits1(gb) != 0) { /* is_ol_id */
-        vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
-        skip_bits(gb, 3); /* vo_priority */
-    } else {
-        vo_ver_id = 1;
-    }
-    s->aspect_ratio_info= get_bits(gb, 4);
-    if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
-        s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
-        s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
-    }else{
-        s->avctx->sample_aspect_ratio= pixel_aspect[s->aspect_ratio_info];
-    }
-
-    if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
-        int chroma_format= get_bits(gb, 2);
-        if(chroma_format!=CHROMA_420){
-            av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
-        }
-        s->low_delay= get_bits1(gb);
-        if(get_bits1(gb)){ /* vbv parameters */
-            get_bits(gb, 15);   /* first_half_bitrate */
-            skip_bits1(gb);     /* marker */
-            get_bits(gb, 15);   /* latter_half_bitrate */
-            skip_bits1(gb);     /* marker */
-            get_bits(gb, 15);   /* first_half_vbv_buffer_size */
-            skip_bits1(gb);     /* marker */
-            get_bits(gb, 3);    /* latter_half_vbv_buffer_size */
-            get_bits(gb, 11);   /* first_half_vbv_occupancy */
-            skip_bits1(gb);     /* marker */
-            get_bits(gb, 15);   /* latter_half_vbv_occupancy */
-            skip_bits1(gb);     /* marker */
-        }
-    }else{
-        // set low delay flag only once the smartest? low delay detection won't be overriden
-        if(s->picture_number==0)
-            s->low_delay=0;
-    }
-
-    s->shape = get_bits(gb, 2); /* vol shape */
-    if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
-    if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
-        av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
-        skip_bits(gb, 4);  //video_object_layer_shape_extension
-    }
-
-    check_marker(gb, "before time_increment_resolution");
-
-    s->avctx->time_base.den = get_bits(gb, 16);
-    if(!s->avctx->time_base.den){
-        av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
-        return -1;
-    }
-
-    s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
-    if (s->time_increment_bits < 1)
-        s->time_increment_bits = 1;
-
-    check_marker(gb, "before fixed_vop_rate");
-
-    if (get_bits1(gb) != 0) {   /* fixed_vop_rate  */
-        s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
-    }else
-        s->avctx->time_base.num = 1;
-
-    s->t_frame=0;
-
-    if (s->shape != BIN_ONLY_SHAPE) {
-        if (s->shape == RECT_SHAPE) {
-            skip_bits1(gb);   /* marker */
-            width = get_bits(gb, 13);
-            skip_bits1(gb);   /* marker */
-            height = get_bits(gb, 13);
-            skip_bits1(gb);   /* marker */
-            if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
-                s->width = width;
-                s->height = height;
-            }
-        }
-
-        s->progressive_sequence=
-        s->progressive_frame= get_bits1(gb)^1;
-        s->interlaced_dct=0;
-        if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
-            av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n");   /* OBMC Disable */
-        if (vo_ver_id == 1) {
-            s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
-        } else {
-            s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
-        }
-        if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
-        if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
-            if(s->vol_sprite_usage==STATIC_SPRITE){
-                s->sprite_width = get_bits(gb, 13);
-                skip_bits1(gb); /* marker */
-                s->sprite_height= get_bits(gb, 13);
-                skip_bits1(gb); /* marker */
-                s->sprite_left  = get_bits(gb, 13);
-                skip_bits1(gb); /* marker */
-                s->sprite_top   = get_bits(gb, 13);
-                skip_bits1(gb); /* marker */
-            }
-            s->num_sprite_warping_points= get_bits(gb, 6);
-            if(s->num_sprite_warping_points > 3){
-                av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
-                s->num_sprite_warping_points= 0;
-                return -1;
-            }
-            s->sprite_warping_accuracy = get_bits(gb, 2);
-            s->sprite_brightness_change= get_bits1(gb);
-            if(s->vol_sprite_usage==STATIC_SPRITE)
-                s->low_latency_sprite= get_bits1(gb);
-        }
-        // FIXME sadct disable bit if verid!=1 && shape not rect
-
-        if (get_bits1(gb) == 1) {   /* not_8_bit */
-            s->quant_precision = get_bits(gb, 4); /* quant_precision */
-            if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
-            if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
-        } else {
-            s->quant_precision = 5;
-        }
-
-        // FIXME a bunch of grayscale shape things
-
-        if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
-            int i, v;
-
-            /* load default matrixes */
-            for(i=0; i<64; i++){
-                int j= s->dsp.idct_permutation[i];
-                v= ff_mpeg4_default_intra_matrix[i];
-                s->intra_matrix[j]= v;
-                s->chroma_intra_matrix[j]= v;
-
-                v= ff_mpeg4_default_non_intra_matrix[i];
-                s->inter_matrix[j]= v;
-                s->chroma_inter_matrix[j]= v;
-            }
-
-            /* load custom intra matrix */
-            if(get_bits1(gb)){
-                int last=0;
-                for(i=0; i<64; i++){
-                    int j;
-                    v= get_bits(gb, 8);
-                    if(v==0) break;
-
-                    last= v;
-                    j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
-                    s->intra_matrix[j]= v;
-                    s->chroma_intra_matrix[j]= v;
-                }
-
-                /* replicate last value */
-                for(; i<64; i++){
-                    int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
-                    s->intra_matrix[j]= last;
-                    s->chroma_intra_matrix[j]= last;
-                }
-            }
-
-            /* load custom non intra matrix */
-            if(get_bits1(gb)){
-                int last=0;
-                for(i=0; i<64; i++){
-                    int j;
-                    v= get_bits(gb, 8);
-                    if(v==0) break;
-
-                    last= v;
-                    j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
-                    s->inter_matrix[j]= v;
-                    s->chroma_inter_matrix[j]= v;
-                }
-
-                /* replicate last value */
-                for(; i<64; i++){
-                    int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
-                    s->inter_matrix[j]= last;
-                    s->chroma_inter_matrix[j]= last;
-                }
-            }
-
-            // FIXME a bunch of grayscale shape things
-        }
-
-        if(vo_ver_id != 1)
-             s->quarter_sample= get_bits1(gb);
-        else s->quarter_sample=0;
-
-        if(!get_bits1(gb)){
-            int pos= get_bits_count(gb);
-            int estimation_method= get_bits(gb, 2);
-            if(estimation_method<2){
-                if(!get_bits1(gb)){
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
-                }
-                if(!get_bits1(gb)){
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
-                    s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
-                    s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
-                }
-                if(!check_marker(gb, "in complexity estimation part 1")){
-                    skip_bits_long(gb, pos - get_bits_count(gb));
-                    goto no_cplx_est;
-                }
-                if(!get_bits1(gb)){
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
-                    s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
-                }
-                if(!get_bits1(gb)){
-                    s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
-                    s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
-                    s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
-                    s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
-                    s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
-                    s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
-                }
-                if(!check_marker(gb, "in complexity estimation part 2")){
-                    skip_bits_long(gb, pos - get_bits_count(gb));
-                    goto no_cplx_est;
-                }
-                if(estimation_method==1){
-                    s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
-                    s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
-                }
-            }else
-                av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
-        }else{
-no_cplx_est:
-            s->cplx_estimation_trash_i=
-            s->cplx_estimation_trash_p=
-            s->cplx_estimation_trash_b= 0;
-        }
-
-        s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
-
-        s->data_partitioning= get_bits1(gb);
-        if(s->data_partitioning){
-            s->rvlc= get_bits1(gb);
-        }
-
-        if(vo_ver_id != 1) {
-            s->new_pred= get_bits1(gb);
-            if(s->new_pred){
-                av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
-                skip_bits(gb, 2); /* requested upstream message type */
-                skip_bits1(gb); /* newpred segment type */
-            }
-            s->reduced_res_vop= get_bits1(gb);
-            if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
-        }
-        else{
-            s->new_pred=0;
-            s->reduced_res_vop= 0;
-        }
-
-        s->scalability= get_bits1(gb);
-
-        if (s->scalability) {
-            GetBitContext bak= *gb;
-            int ref_layer_id;
-            int ref_layer_sampling_dir;
-            int h_sampling_factor_n;
-            int h_sampling_factor_m;
-            int v_sampling_factor_n;
-            int v_sampling_factor_m;
-
-            s->hierachy_type= get_bits1(gb);
-            ref_layer_id= get_bits(gb, 4);
-            ref_layer_sampling_dir= get_bits1(gb);
-            h_sampling_factor_n= get_bits(gb, 5);
-            h_sampling_factor_m= get_bits(gb, 5);
-            v_sampling_factor_n= get_bits(gb, 5);
-            v_sampling_factor_m= get_bits(gb, 5);
-            s->enhancement_type= get_bits1(gb);
-
-            if(   h_sampling_factor_n==0 || h_sampling_factor_m==0
-               || v_sampling_factor_n==0 || v_sampling_factor_m==0){
-                /* illegal scalability header (VERY broken encoder),
-                 * trying to workaround */
-                s->scalability=0;
-                *gb= bak;
-            }else
-                av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
-
-            // bin shape stuff FIXME
-        }
-    }
-    return 0;
-}
-
-/**
- * decodes the user data stuff in the header.
- * Also initializes divx/xvid/lavc_version/build.
- */
-static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
-    char buf[256];
-    int i;
-    int e;
-    int ver = 0, build = 0, ver2 = 0, ver3 = 0;
-    char last;
-
-    for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
-        if(show_bits(gb, 23) == 0) break;
-        buf[i]= get_bits(gb, 8);
-    }
-    buf[i]=0;
-
-    /* divx detection */
-    e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
-    if(e<2)
-        e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
-    if(e>=2){
-        s->divx_version= ver;
-        s->divx_build= build;
-        s->divx_packed= e==3 && last=='p';
-        if(s->divx_packed && !s->showed_packed_warning) {
-            av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
-            s->showed_packed_warning=1;
-        }
-    }
-
-    /* ffmpeg detection */
-    e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
-    if(e!=4)
-        e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
-    if(e!=4){
-        e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
-        if (e>1)
-            build= (ver<<16) + (ver2<<8) + ver3;
-    }
-    if(e!=4){
-        if(strcmp(buf, "ffmpeg")==0){
-            s->lavc_build= 4600;
-        }
-    }
-    if(e==4){
-        s->lavc_build= build;
-    }
-
-    /* Xvid detection */
-    e=sscanf(buf, "XviD%d", &build);
-    if(e==1){
-        s->xvid_build= build;
-    }
-
-    return 0;
-}
-
-static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
-    int time_incr, time_increment;
-
-    s->pict_type = get_bits(gb, 2) + FF_I_TYPE;        /* pict type: I = 0 , P = 1 */
-    if(s->pict_type==FF_B_TYPE && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
-        av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
-        s->low_delay=0;
-    }
-
-    s->partitioned_frame= s->data_partitioning && s->pict_type!=FF_B_TYPE;
-    if(s->partitioned_frame)
-        s->decode_mb= mpeg4_decode_partitioned_mb;
-    else
-        s->decode_mb= ff_mpeg4_decode_mb;
-
-    time_incr=0;
-    while (get_bits1(gb) != 0)
-        time_incr++;
-
-    check_marker(gb, "before time_increment");
-
-    if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
-        av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
-
-        for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
-            if (    s->pict_type == FF_P_TYPE
-                || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE)) {
-                if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
-            }else
-                if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
-        }
-
-        av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
-    }
-
-    if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
-    else time_increment= get_bits(gb, s->time_increment_bits);
-
-    if(s->pict_type!=FF_B_TYPE){
-        s->last_time_base= s->time_base;
-        s->time_base+= time_incr;
-        s->time= s->time_base*s->avctx->time_base.den + time_increment;
-        if(s->workaround_bugs&FF_BUG_UMP4){
-            if(s->time < s->last_non_b_time){
-                /* header is not mpeg-4-compatible, broken encoder,
-                 * trying to workaround */
-                s->time_base++;
-                s->time+= s->avctx->time_base.den;
-            }
-        }
-        s->pp_time= s->time - s->last_non_b_time;
-        s->last_non_b_time= s->time;
-    }else{
-        s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
-        s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
-        if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
-            /* messed up order, maybe after seeking? skipping current b-frame */
-            return FRAME_SKIPPED;
-        }
-        ff_mpeg4_init_direct_mv(s);
-
-        if(s->t_frame==0) s->t_frame= s->pb_time;
-        if(s->t_frame==0) s->t_frame=1; // 1/0 protection
-        s->pp_field_time= (  ROUNDED_DIV(s->last_non_b_time, s->t_frame)
-                           - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
-        s->pb_field_time= (  ROUNDED_DIV(s->time, s->t_frame)
-                           - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
-        if(!s->progressive_sequence){
-            if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
-                return FRAME_SKIPPED;
-        }
-    }
-
-    if(s->avctx->time_base.num)
-        s->current_picture_ptr->pts= (s->time + s->avctx->time_base.num/2) / s->avctx->time_base.num;
-    else
-        s->current_picture_ptr->pts= AV_NOPTS_VALUE;
-    if(s->avctx->debug&FF_DEBUG_PTS)
-        av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n", s->current_picture_ptr->pts);
-
-    check_marker(gb, "before vop_coded");
-
-    /* vop coded */
-    if (get_bits1(gb) != 1){
-        if(s->avctx->debug&FF_DEBUG_PICT_INFO)
-            av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
-        return FRAME_SKIPPED;
-    }
-    if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == FF_P_TYPE
-                          || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE))) {
-        /* rounding type for motion estimation */
-        s->no_rounding = get_bits1(gb);
-    } else {
-        s->no_rounding = 0;
-    }
-//FIXME reduced res stuff
-
-     if (s->shape != RECT_SHAPE) {
-         if (s->vol_sprite_usage != 1 || s->pict_type != FF_I_TYPE) {
-             int width, height, hor_spat_ref, ver_spat_ref;
-
-             width = get_bits(gb, 13);
-             skip_bits1(gb);   /* marker */
-             height = get_bits(gb, 13);
-             skip_bits1(gb);   /* marker */
-             hor_spat_ref = get_bits(gb, 13); /* hor_spat_ref */
-             skip_bits1(gb);   /* marker */
-             ver_spat_ref = get_bits(gb, 13); /* ver_spat_ref */
-         }
-         skip_bits1(gb); /* change_CR_disable */
-
-         if (get_bits1(gb) != 0) {
-             skip_bits(gb, 8); /* constant_alpha_value */
-         }
-     }
-//FIXME complexity estimation stuff
-
-     if (s->shape != BIN_ONLY_SHAPE) {
-         skip_bits_long(gb, s->cplx_estimation_trash_i);
-         if(s->pict_type != FF_I_TYPE)
-            skip_bits_long(gb, s->cplx_estimation_trash_p);
-         if(s->pict_type == FF_B_TYPE)
-            skip_bits_long(gb, s->cplx_estimation_trash_b);
-
-         s->intra_dc_threshold= mpeg4_dc_threshold[ get_bits(gb, 3) ];
-         if(!s->progressive_sequence){
-             s->top_field_first= get_bits1(gb);
-             s->alternate_scan= get_bits1(gb);
-         }else
-             s->alternate_scan= 0;
-     }
-
-     if(s->alternate_scan){
-         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
-         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
-         ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
-         ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
-     } else{
-         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
-         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
-         ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
-         ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
-     }
-
-     if(s->pict_type == FF_S_TYPE && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
-         mpeg4_decode_sprite_trajectory(s, gb);
-         if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
-         if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
-     }
-
-     if (s->shape != BIN_ONLY_SHAPE) {
-         s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
-         if(s->qscale==0){
-             av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
-             return -1; // makes no sense to continue, as there is nothing left from the image then
-         }
-
-         if (s->pict_type != FF_I_TYPE) {
-             s->f_code = get_bits(gb, 3);       /* fcode_for */
-             if(s->f_code==0){
-                 av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
-                 return -1; // makes no sense to continue, as the MV decoding will break very quickly
-             }
-         }else
-             s->f_code=1;
-
-         if (s->pict_type == FF_B_TYPE) {
-             s->b_code = get_bits(gb, 3);
-         }else
-             s->b_code=1;
-
-         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
-             av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d\n",
-                 s->qscale, s->f_code, s->b_code,
-                 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
-                 gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
-                 s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
-                 s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold, s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b);
-         }
-
-         if(!s->scalability){
-             if (s->shape!=RECT_SHAPE && s->pict_type!=FF_I_TYPE) {
-                 skip_bits1(gb); // vop shape coding type
-             }
-         }else{
-             if(s->enhancement_type){
-                 int load_backward_shape= get_bits1(gb);
-                 if(load_backward_shape){
-                     av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
-                 }
-             }
-             skip_bits(gb, 2); //ref_select_code
-         }
-     }
-     /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
-     // note we cannot detect divx5 without b-frames easily (although it's buggy too)
-     if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==0 && s->picture_number==0){
-         av_log(s->avctx, AV_LOG_ERROR, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
-         s->low_delay=1;
-     }
-
-     s->picture_number++; // better than pic number==0 always ;)
-
-     s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
-     s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
-
-     if(s->workaround_bugs&FF_BUG_EDGE){
-         s->h_edge_pos= s->width;
-         s->v_edge_pos= s->height;
-     }
-     return 0;
-}
-
-/**
- * decode mpeg4 headers
- * @return <0 if no VOP found (or a damaged one)
- *         FRAME_SKIPPED if a not coded VOP is found
- *         0 if a VOP is found
- */
-int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
-{
-    int startcode, v;
-
-    /* search next start code */
-    align_get_bits(gb);
-
-    if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
-        skip_bits(gb, 24);
-        if(get_bits(gb, 8) == 0xF0)
-            goto end;
-    }
-
-    startcode = 0xff;
-    for(;;) {
-        if(get_bits_count(gb) >= gb->size_in_bits){
-            if(gb->size_in_bits==8 && (s->divx_version || s->xvid_build)){
-                av_log(s->avctx, AV_LOG_ERROR, "frame skip %d\n", gb->size_in_bits);
-                return FRAME_SKIPPED; //divx bug
-            }else
-                return -1; //end of stream
-        }
-
-        /* use the bits after the test */
-        v = get_bits(gb, 8);
-        startcode = ((startcode << 8) | v) & 0xffffffff;
-
-        if((startcode&0xFFFFFF00) != 0x100)
-            continue; //no startcode
-
-        if(s->avctx->debug&FF_DEBUG_STARTCODE){
-            av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
-            if     (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
-            else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
-            else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
-            else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
-            else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
-            else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
-            else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
-            else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
-            else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
-            else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
-            else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
-            else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
-            else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
-            else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
-            else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
-            else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
-            else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
-            else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
-            else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
-            else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
-            else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
-            else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
-            else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
-            else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
-            else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
-            else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
-            else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
-            av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
-        }
-
-        if(startcode >= 0x120 && startcode <= 0x12F){
-            if(decode_vol_header(s, gb) < 0)
-                return -1;
-        }
-        else if(startcode == USER_DATA_STARTCODE){
-            decode_user_data(s, gb);
-        }
-        else if(startcode == GOP_STARTCODE){
-            mpeg4_decode_gop_header(s, gb);
-        }
-        else if(startcode == VOP_STARTCODE){
-            break;
-        }
-
-        align_get_bits(gb);
-        startcode = 0xff;
-    }
-end:
-    if(s->flags& CODEC_FLAG_LOW_DELAY)
-        s->low_delay=1;
-    s->avctx->has_b_frames= !s->low_delay;
-    return decode_vop_header(s, gb);
-}
-
-/* don't understand why they choose a different header ! */
-int intel_h263_decode_picture_header(MpegEncContext *s)
-{
-    int format;
-
-    /* picture header */
-    if (get_bits_long(&s->gb, 22) != 0x20) {
-        av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
-        return -1;
-    }
-    s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
-
-    if (get_bits1(&s->gb) != 1) {
-        av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
-        return -1;      /* marker */
-    }
-    if (get_bits1(&s->gb) != 0) {
-        av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
-        return -1;      /* h263 id */
-    }
-    skip_bits1(&s->gb);         /* split screen off */
-    skip_bits1(&s->gb);         /* camera  off */
-    skip_bits1(&s->gb);         /* freeze picture release off */
-
-    format = get_bits(&s->gb, 3);
-    if (format != 7) {
-        av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supported\n");
-        return -1;
-    }
-    s->h263_plus = 0;
-
-    s->pict_type = FF_I_TYPE + get_bits1(&s->gb);
-
-    s->unrestricted_mv = get_bits1(&s->gb);
-    s->h263_long_vectors = s->unrestricted_mv;
-
-    if (get_bits1(&s->gb) != 0) {
-        av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n");
-        return -1;      /* SAC: off */
-    }
-    s->obmc= get_bits1(&s->gb);
-    s->pb_frame = get_bits1(&s->gb);
-
-    if(format == 7){
-        format = get_bits(&s->gb, 3);
-        if(format == 0 || format == 7){
-            av_log(s->avctx, AV_LOG_ERROR, "Wrong Intel H263 format\n");
-            return -1;
-        }
-        if(get_bits(&s->gb, 2))
-            av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
-        s->loop_filter = get_bits1(&s->gb);
-        if(get_bits1(&s->gb))
-            av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
-        if(get_bits1(&s->gb))
-            s->pb_frame = 2;
-        if(get_bits(&s->gb, 5))
-            av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
-        if(get_bits(&s->gb, 5) != 1)
-            av_log(s->avctx, AV_LOG_ERROR, "Invalid marker\n");
-    }
-    if(format == 6){
-        int ar = get_bits(&s->gb, 4);
-        skip_bits(&s->gb, 9); // display width
-        skip_bits1(&s->gb);
-        skip_bits(&s->gb, 9); // display height
-        if(ar == 15){
-            skip_bits(&s->gb, 8); // aspect ratio - width
-            skip_bits(&s->gb, 8); // aspect ratio - height
-        }
-    }
-
-    s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
-    skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
-
-    if(s->pb_frame){
-        skip_bits(&s->gb, 3); //temporal reference for B-frame
-        skip_bits(&s->gb, 2); //dbquant
-    }
-
-    /* PEI */
-    while (get_bits1(&s->gb) != 0) {
-        skip_bits(&s->gb, 8);
-    }
-    s->f_code = 1;
-
-    s->y_dc_scale_table=
-    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
-
-    if(s->avctx->debug&FF_DEBUG_PICT_INFO)
-        show_pict_info(s);
-
-    return 0;
-}
-
-int flv_h263_decode_picture_header(MpegEncContext *s)
-{
-    int format, width, height;
-
-    /* picture header */
-    if (get_bits_long(&s->gb, 17) != 1) {
-        av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
-        return -1;
-    }
-    format = get_bits(&s->gb, 5);
-    if (format != 0 && format != 1) {
-        av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
-        return -1;
-    }
-    s->h263_flv = format+1;
-    s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
-    format = get_bits(&s->gb, 3);
-    switch (format) {
-    case 0:
-        width = get_bits(&s->gb, 8);
-        height = get_bits(&s->gb, 8);
-        break;
-    case 1:
-        width = get_bits(&s->gb, 16);
-        height = get_bits(&s->gb, 16);
-        break;
-    case 2:
-        width = 352;
-        height = 288;
-        break;
-    case 3:
-        width = 176;
-        height = 144;
-        break;
-    case 4:
-        width = 128;
-        height = 96;
-        break;
-    case 5:
-        width = 320;
-        height = 240;
-        break;
-    case 6:
-        width = 160;
-        height = 120;
-        break;
-    default:
-        width = height = 0;
-        break;
-    }
-    if(avcodec_check_dimensions(s->avctx, width, height))
-        return -1;
-    s->width = width;
-    s->height = height;
-
-    s->pict_type = FF_I_TYPE + get_bits(&s->gb, 2);
-    s->dropable= s->pict_type > FF_P_TYPE;
-    if (s->dropable)
-        s->pict_type = FF_P_TYPE;
-
-    skip_bits1(&s->gb); /* deblocking flag */
-    s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
-
-    s->h263_plus = 0;
-
-    s->unrestricted_mv = 1;
-    s->h263_long_vectors = 0;
-
-    /* PEI */
-    while (get_bits1(&s->gb) != 0) {
-        skip_bits(&s->gb, 8);
-    }
-    s->f_code = 1;
-
-    if(s->avctx->debug & FF_DEBUG_PICT_INFO){
-        av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
-               s->dropable ? 'D' : av_get_pict_type_char(s->pict_type), s->h263_flv-1, s->qscale, s->picture_number);
-    }
-
-    s->y_dc_scale_table=
-    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
-
-    return 0;
-}