lavc/aacsbr: fix make checkheaders warning
[ffmpeg.git] / libavcodec / h263.c
index 23179a1..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 "mathops.h"
-#include "unary.h"
+#include "mpegutils.h"
 #include "flv.h"
 #include "mpeg4video.h"
 
-//#undef NDEBUG
-//#include <assert.h>
-
-// The defines below define the number of bits that are read at once for
-// reading vlc values. Changing these may improve speed and data cache needs
-// be aware though that decreasing them may need the number of stages that is
-// passed to get_vlc* to be increased.
-#define MV_VLC_BITS 9
-#define H263_MBTYPE_B_VLC_BITS 6
-#define CBPC_B_VLC_BITS 3
-
-
-#if CONFIG_ENCODERS
-/**
- * Table of number of bits a motion vector component needs.
- */
-static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
-
-/**
- * Minimal fcode that a motion vector component would need.
- */
-static uint8_t fcode_tab[MAX_MV*2+1];
-
-/**
- * Minimal fcode that a motion vector component would need in umv.
- * All entries in this table are 1.
- */
-static uint8_t umv_fcode_tab[MAX_MV*2+1];
-
-//unified encoding tables for run length encoding of coefficients
-//unified in the sense that the specification specifies the encoding in several steps.
-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))
-
-#endif
-
-static uint8_t static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
-
-
-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;
-}
-
-void ff_h263_show_pict_info(MpegEncContext *s){
-    if(s->avctx->debug&FF_DEBUG_PICT_INFO){
-    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
-
-/**
- * Returns the 4 bit value that specifies the given aspect ratio.
- * This may be one of the standard aspect ratios or it specifies
- * that the aspect will be stored explicitly later.
- */
-av_const int ff_h263_aspect_to_info(AVRational aspect){
-    int i;
-
-    if(aspect.num==0) aspect= (AVRational){1,1};
-
-    for(i=1; i<6; i++){
-        if(av_cmp_q(ff_h263_pixel_aspect[i], aspect) == 0){
-            return i;
-        }
-    }
-
-    return FF_ASPECT_EXTENDED;
-}
-
-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) */
-            s->aspect_ratio_info= ff_h263_aspect_to_info(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 */
-    }
-}
-
-/**
- * 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;
-            }
-        }
-    }
-}
-
-#endif //CONFIG_ENCODERS
-
-#define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
-#define tab_bias (tab_size/2)
-
-//used by mpeg4 and rv10 decoder
-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;
@@ -445,7 +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;
@@ -464,191 +64,34 @@ 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;
-        else
-            s->current_picture.mb_type[mb_xy]= MB_TYPE_L0 | MB_TYPE_16x16;
-    }
-}
-
-#if CONFIG_ENCODERS
-
-static const int dquant_code[5]= {1,0,9,2,3};
-
-/**
- * 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 = &ff_h263_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);
+            s->current_picture.mb_type[mb_xy] = MB_TYPE_INTRA;
         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(!CONFIG_FLV_ENCODER || s->h263_flv <= 1){
-                put_bits(&s->pb, 1, last);
-                put_bits(&s->pb, 6, run);
-
-                assert(slevel != 0);
-
-                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{
-                    ff_flv2_encode_ac_esc(&s->pb, slevel, level, run, last);
-              }
-            } else {
-                put_bits(&s->pb, 1, sign);
-            }
-            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);
+            s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_16x16;
     }
 }
 
-static int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
+int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
 {
     int x, y, wrap, a, c, pred_dc;
     int16_t *dc_val;
@@ -689,208 +132,6 @@ static int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
     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,
-                    ff_h263_inter_MCBPC_bits[cbpc],
-                    ff_h263_inter_MCBPC_code[cbpc]);
-
-            put_bits(&s->pb, ff_h263_cbpy_tab[cbpy][1], ff_h263_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,
-                    ff_h263_inter_MCBPC_bits[cbpc+16],
-                    ff_h263_inter_MCBPC_code[cbpc+16]);
-            put_bits(&s->pb, ff_h263_cbpy_tab[cbpy][1], ff_h263_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,
-                ff_h263_intra_MCBPC_bits[cbpc],
-                ff_h263_intra_MCBPC_code[cbpc]);
-        } else {
-            if(s->dquant) cbpc+=8;
-            put_bits(&s->pb, 1, 0);     /* mb coded */
-            put_bits(&s->pb,
-                ff_h263_inter_MCBPC_bits[cbpc + 4],
-                ff_h263_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, ff_h263_cbpy_tab[cbpy][1], ff_h263_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;
@@ -900,26 +141,24 @@ void ff_h263_loop_filter(MpegEncContext * s){
     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])){
+    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);
+        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(s->mb_y){
         int qp_dt, qp_tt, qp_tc;
 
-        if(IS_SKIP(s->current_picture.mb_type[xy-s->mb_stride]))
+        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];
+            qp_tt = s->current_picture.qscale_table[xy - s->mb_stride];
 
         if(qp_c)
             qp_tc= qp_c;
@@ -928,57 +167,57 @@ void ff_h263_loop_filter(MpegEncContext * s){
 
         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->h263dsp.h263_v_loop_filter(dest_y,     linesize, qp_tc);
+            s->h263dsp.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);
+            s->h263dsp.h263_v_loop_filter(dest_cb, uvlinesize, chroma_qp);
+            s->h263dsp.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);
+            s->h263dsp.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]))
+            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];
+                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);
+                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);
             }
         }
     }
 
     if(qp_c){
-        s->dsp.h263_h_loop_filter(dest_y +8,   linesize, qp_c);
+        s->h263dsp.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);
+            s->h263dsp.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]))
+        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];
+            qp_lc = s->current_picture.qscale_table[xy - 1];
 
         if(qp_lc){
-            s->dsp.h263_h_loop_filter(dest_y,   linesize, 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->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);
+                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);
             }
         }
     }
 }
 
-static void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n)
+void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n)
 {
     int x, y, wrap, a, c, pred_dc, scale, i;
     int16_t *dc_val, *ac_val, *ac_val1;
@@ -1022,7 +261,7 @@ static void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n)
             if (a != 1024) {
                 ac_val -= 16;
                 for(i=1;i<8;i++) {
-                    block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
+                    block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
                 }
                 pred_dc = a;
             }
@@ -1031,7 +270,7 @@ static void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n)
             if (c != 1024) {
                 ac_val -= 16 * wrap;
                 for(i=1;i<8;i++) {
-                    block[s->dsp.idct_permutation[i   ]] += ac_val[i + 8];
+                    block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
                 }
                 pred_dc = c;
             }
@@ -1059,14 +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];
@@ -1078,7 +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
@@ -1122,1257 +361,3 @@ int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
     }
     return *mot_val;
 }
-
-#if CONFIG_ENCODERS
-
-/***************************************************/
-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_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_rl(&ff_h263_rl_inter, static_rl_table_store[0]);
-        init_rl(&rl_intra_aic, static_rl_table_store[1]);
-
-        init_uni_h263_rl_tab(&rl_intra_aic, NULL, uni_h263_intra_aic_rl_len);
-        init_uni_h263_rl_tab(&ff_h263_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;
-        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
-
-/***********************************************/
-/* decoding */
-
-VLC ff_h263_intra_MCBPC_vlc;
-VLC ff_h263_inter_MCBPC_vlc;
-VLC ff_h263_cbpy_vlc;
-static VLC mv_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(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
-                 ff_h263_intra_MCBPC_bits, 1, 1,
-                 ff_h263_intra_MCBPC_code, 1, 1, 72);
-        INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
-                 ff_h263_inter_MCBPC_bits, 1, 1,
-                 ff_h263_inter_MCBPC_code, 1, 1, 198);
-        INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
-                 &ff_h263_cbpy_tab[0][1], 2, 1,
-                 &ff_h263_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(&ff_h263_rl_inter, static_rl_table_store[0]);
-        init_rl(&rl_intra_aic, static_rl_table_store[1]);
-        INIT_VLC_RL(ff_h263_rl_inter, 554);
-        INIT_VLC_RL(rl_intra_aic, 554);
-        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;
-}
-
-/**
- * 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(CONFIG_MPEG4_DECODER && 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(CONFIG_MPEG4_DECODER && 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;
-}
-
-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;
-}
-
-
-/* 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, ff_h263_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, ff_h263_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 = &ff_h263_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 (CONFIG_FLV_DECODER && s->h263_flv > 1) {
-                ff_flv2_decode_ac_esc(&s->gb, &level, &run, &last);
-            } 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 == &ff_h263_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, ff_h263_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, ff_h263_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, ff_h263_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, ff_h263_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, ff_h263_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;
-}
-
-/* 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= ff_h263_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;
-    }
-
-        ff_h263_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;
-}
-
-