Split H263 encoder and decoder from common code.
authorMichael Niedermayer <michaelni@gmx.at>
Sat, 9 Jan 2010 14:59:06 +0000 (14:59 +0000)
committerMichael Niedermayer <michaelni@gmx.at>
Sat, 9 Jan 2010 14:59:06 +0000 (14:59 +0000)
Originally committed as revision 21109 to svn://svn.ffmpeg.org/ffmpeg/trunk

15 files changed:
libavcodec/Makefile
libavcodec/flvdec.c
libavcodec/flvenc.c
libavcodec/h263.c
libavcodec/h263.h
libavcodec/h263data.h
libavcodec/h263dec.c
libavcodec/intelh263dec.c
libavcodec/ituh263dec.c [new file with mode: 0644]
libavcodec/ituh263enc.c [new file with mode: 0644]
libavcodec/mpegvideo.h
libavcodec/rv10.c
libavcodec/svq1enc.c
libavcodec/wmv2dec.c
libavcodec/wmv2enc.c

index a08c75f..766f0f7 100644 (file)
@@ -124,11 +124,11 @@ OBJS-$(CONFIG_H261_ENCODER)            += h261enc.o h261.o             \
                                           mpegvideo_enc.o motion_est.o \
                                           ratecontrol.o mpeg12data.o   \
                                           mpegvideo.o
-OBJS-$(CONFIG_H263_DECODER)            += h263dec.o h263.o mpeg4video.o mpeg4videodec.o flvdec.o intelh263dec.o \
+OBJS-$(CONFIG_H263_DECODER)            += h263dec.o h263.o ituh263dec.o mpeg4video.o mpeg4videodec.o flvdec.o intelh263dec.o \
                                           mpegvideo.o error_resilience.o
 OBJS-$(CONFIG_H263_VAAPI_HWACCEL)      += vaapi_mpeg4.o
 OBJS-$(CONFIG_H263_ENCODER)            += mpegvideo_enc.o mpeg4video.o mpeg4videoenc.o motion_est.o      \
-                                          ratecontrol.o h263.o flvenc.o mpeg12data.o \
+                                          ratecontrol.o h263.o ituh263enc.o flvenc.o mpeg12data.o \
                                           mpegvideo.o error_resilience.o
 OBJS-$(CONFIG_H264_DECODER)            += h264.o h264idct.o h264pred.o cabac.o \
                                           mpegvideo.o error_resilience.o
index ea494d7..50f7b25 100644 (file)
@@ -18,6 +18,7 @@
  */
 
 #include "mpegvideo.h"
+#include "h263.h"
 #include "flv.h"
 
 void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last){
index f07f993..80dd46b 100644 (file)
@@ -18,6 +18,7 @@
  */
 
 #include "mpegvideo.h"
+#include "h263.h"
 #include "flv.h"
 
 void ff_flv_encode_picture_header(MpegEncContext * s, int picture_number)
index 51bfacf..2eb1ff5 100644 (file)
@@ -5,10 +5,6 @@
  * 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
 //#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;
-            }
-        }
-    }
-}
+uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
 
-#endif //CONFIG_ENCODERS
 
 void ff_h263_update_motion_val(MpegEncContext * s){
     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
@@ -393,164 +98,7 @@ void ff_h263_update_motion_val(MpegEncContext * s){
     }
 }
 
-#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);
-        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);
-    }
-}
-
-static int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
+int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
 {
     int x, y, wrap, a, c, pred_dc;
     int16_t *dc_val;
@@ -591,208 +139,6 @@ 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;
@@ -880,7 +226,7 @@ void ff_h263_loop_filter(MpegEncContext * s){
     }
 }
 
-static void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n)
+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;
@@ -1025,229 +371,6 @@ 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.
@@ -1260,1021 +383,3 @@ int ff_h263_get_gob_height(MpegEncContext *s){
     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;
-}
-
-
index f7c5fd0..d45a52d 100644 (file)
@@ -32,6 +32,8 @@
 extern const AVRational ff_h263_pixel_aspect[16];
 extern const uint8_t ff_h263_cbpy_tab[16][2];
 
+extern const uint8_t cbpc_b_tab[4][2];
+
 extern const uint8_t mvtab[33][2];
 
 extern const uint8_t ff_h263_intra_MCBPC_code[9];
@@ -39,6 +41,7 @@ extern const uint8_t ff_h263_intra_MCBPC_bits[9];
 
 extern const uint8_t ff_h263_inter_MCBPC_code[28];
 extern const uint8_t ff_h263_inter_MCBPC_bits[28];
+extern const uint8_t h263_mbtype_b_tab[15][2];
 
 extern VLC ff_h263_intra_MCBPC_vlc;
 extern VLC ff_h263_inter_MCBPC_vlc;
@@ -46,8 +49,66 @@ extern VLC ff_h263_cbpy_vlc;
 
 extern RLTable ff_h263_rl_inter;
 
+extern RLTable rl_intra_aic;
+
+extern const uint16_t h263_format[8][2];
+extern const uint8_t modified_quant_tab[2][32];
+extern uint16_t ff_mba_max[6];
+extern uint8_t ff_mba_length[7];
+
+extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
+
+
 int h263_decode_motion(MpegEncContext * s, int pred, int f_code);
 av_const int ff_h263_aspect_to_info(AVRational aspect);
+int ff_h263_decode_init(AVCodecContext *avctx);
+int ff_h263_decode_frame(AVCodecContext *avctx,
+                             void *data, int *data_size,
+                             AVPacket *avpkt);
+int ff_h263_decode_end(AVCodecContext *avctx);
+void h263_encode_mb(MpegEncContext *s,
+                    DCTELEM block[6][64],
+                    int motion_x, int motion_y);
+void h263_encode_picture_header(MpegEncContext *s, int picture_number);
+void h263_encode_gob_header(MpegEncContext * s, int mb_line);
+int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
+                        int *px, int *py);
+void h263_encode_init(MpegEncContext *s);
+void h263_decode_init_vlc(MpegEncContext *s);
+int h263_decode_picture_header(MpegEncContext *s);
+int ff_h263_decode_gob_header(MpegEncContext *s);
+void ff_h263_update_motion_val(MpegEncContext * s);
+void ff_h263_loop_filter(MpegEncContext * s);
+void ff_set_qscale(MpegEncContext * s, int qscale);
+int ff_h263_decode_mba(MpegEncContext *s);
+void ff_h263_encode_mba(MpegEncContext *s);
+void ff_init_qscale_tab(MpegEncContext *s);
+int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
+void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n);
+
+
+/**
+ * Prints picture info if FF_DEBUG_PICT_INFO is set.
+ */
+void ff_h263_show_pict_info(MpegEncContext *s);
+
+int ff_intel_h263_decode_picture_header(MpegEncContext *s);
+int ff_h263_decode_mb(MpegEncContext *s,
+                      DCTELEM block[6][64]);
+
+/**
+ * Returns the value of the 3bit "source format" syntax element.
+ * that represents some standard picture dimensions or indicates that
+ * width&height are explicitly stored later.
+ */
+int av_const h263_get_picture_format(int width, int height);
+
+void ff_clean_h263_qscales(MpegEncContext *s);
+int ff_h263_resync(MpegEncContext *s);
+const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);
+int ff_h263_get_gob_height(MpegEncContext *s);
+void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
+
 
 static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
     int l, bit_size, code;
@@ -175,4 +236,11 @@ static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64],
     }
     return cbp;
 }
+
+static inline void memsetw(short *tab, int val, int n)
+{
+    int i;
+    for(i=0;i<n;i++)
+        tab[i] = val;
+}
 #endif
index 0553ca7..ab5d5b3 100644 (file)
@@ -57,7 +57,7 @@ const uint8_t ff_h263_inter_MCBPC_bits[28] = {
     11, 13, 13, 13,/* inter4Q*/
 };
 
-static const uint8_t h263_mbtype_b_tab[15][2] = {
+const uint8_t h263_mbtype_b_tab[15][2] = {
  {1, 1},
  {3, 3},
  {1, 5},
@@ -75,25 +75,7 @@ static const uint8_t h263_mbtype_b_tab[15][2] = {
  {1, 8},
 };
 
-static const int h263_mb_type_b_map[15]= {
-    MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
-    MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP,
-    MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT,
-                      MB_TYPE_L0                                 | MB_TYPE_16x16,
-                      MB_TYPE_L0   | MB_TYPE_CBP                 | MB_TYPE_16x16,
-                      MB_TYPE_L0   | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
-                      MB_TYPE_L1                                 | MB_TYPE_16x16,
-                      MB_TYPE_L1   | MB_TYPE_CBP                 | MB_TYPE_16x16,
-                      MB_TYPE_L1   | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
-                      MB_TYPE_L0L1                               | MB_TYPE_16x16,
-                      MB_TYPE_L0L1 | MB_TYPE_CBP                 | MB_TYPE_16x16,
-                      MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
-    0, //stuffing
-    MB_TYPE_INTRA4x4                | MB_TYPE_CBP,
-    MB_TYPE_INTRA4x4                | MB_TYPE_CBP | MB_TYPE_QUANT,
-};
-
-static const uint8_t cbpc_b_tab[4][2] = {
+const uint8_t cbpc_b_tab[4][2] = {
 {0, 1},
 {2, 2},
 {7, 3},
@@ -246,7 +228,7 @@ static const int8_t intra_level_aic[102] = {
  1,  1,  1,  1,  1,  1,
 };
 
-static RLTable rl_intra_aic = {
+RLTable rl_intra_aic = {
     102,
     58,
     intra_vlc_aic,
@@ -254,25 +236,7 @@ static RLTable rl_intra_aic = {
     intra_level_aic,
 };
 
-#if CONFIG_ENCODERS
-static const uint8_t wrong_run[102] = {
- 1,  2,  3,  5,  4, 10,  9,  8,
-11, 15, 17, 16, 23, 22, 21, 20,
-19, 18, 25, 24, 27, 26, 11,  7,
- 6,  1,  2, 13,  2,  2,  2,  2,
- 6, 12,  3,  9,  1,  3,  4,  3,
- 7,  4,  1,  1,  5,  5, 14,  6,
- 1,  7,  1,  8,  1,  1,  1,  1,
-10,  1,  1,  5,  9, 17, 25, 24,
-29, 33, 32, 41,  2, 23, 28, 31,
- 3, 22, 30,  4, 27, 40,  8, 26,
- 6, 39,  7, 38, 16, 37, 15, 10,
-11, 12, 13, 14,  1, 21, 20, 18,
-19,  2,  1, 34, 35, 36
-};
-#endif
-
-static const uint16_t h263_format[8][2] = {
+const uint16_t h263_format[8][2] = {
     { 0, 0 },
     { 128, 96 },
     { 176, 144 },
@@ -286,7 +250,7 @@ const uint8_t ff_aic_dc_scale_table[32]={
     0, 2, 4, 6, 8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62
 };
 
-static const uint8_t modified_quant_tab[2][32]={
+const uint8_t modified_quant_tab[2][32]={
 //  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
 {
     0, 3, 1, 2, 3, 4, 5, 6, 7, 8, 9, 9,10,11,12,13,14,15,16,17,18,18,19,20,21,22,23,24,25,26,27,28
@@ -300,11 +264,11 @@ const uint8_t ff_h263_chroma_qscale_table[32]={
     0, 1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 9,10,10,11,11,12,12,12,13,13,13,14,14,14,14,14,15,15,15,15,15
 };
 
-const uint16_t ff_mba_max[6]={
+uint16_t ff_mba_max[6]={
      47,  98, 395,1583,6335,9215
 };
 
-const uint8_t ff_mba_length[7]={
+uint8_t ff_mba_length[7]={
       6,   7,   9,  11,  13,  14,  14
 };
 
index c3837b7..a4d9532 100644 (file)
@@ -29,6 +29,7 @@
 #include "avcodec.h"
 #include "dsputil.h"
 #include "mpegvideo.h"
+#include "h263.h"
 #include "h263_parser.h"
 #include "mpeg4video_parser.h"
 #include "msmpeg4.h"
index fb7aaaf..e522ed4 100644 (file)
@@ -19,6 +19,7 @@
  */
 
 #include "mpegvideo.h"
+#include "h263.h"
 
 /* don't understand why they choose a different header ! */
 int ff_intel_h263_decode_picture_header(MpegEncContext *s)
diff --git a/libavcodec/ituh263dec.c b/libavcodec/ituh263dec.c
new file mode 100644 (file)
index 0000000..f415d77
--- /dev/null
@@ -0,0 +1,1131 @@
+/*
+ * ITU H263 bitstream decoder
+ * Copyright (c) 2000,2001 Fabrice Bellard
+ * H263+ support.
+ * Copyright (c) 2001 Juan J. Sierralta P
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file libavcodec/ituh263dec.c
+ * h263 decoder.
+ */
+
+//#define DEBUG
+#include <limits.h>
+
+#include "dsputil.h"
+#include "avcodec.h"
+#include "mpegvideo.h"
+#include "h263.h"
+#include "mathops.h"
+#include "unary.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
+
+static const int h263_mb_type_b_map[15]= {
+    MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
+    MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP,
+    MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT,
+                      MB_TYPE_L0                                 | MB_TYPE_16x16,
+                      MB_TYPE_L0   | MB_TYPE_CBP                 | MB_TYPE_16x16,
+                      MB_TYPE_L0   | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
+                      MB_TYPE_L1                                 | MB_TYPE_16x16,
+                      MB_TYPE_L1   | MB_TYPE_CBP                 | MB_TYPE_16x16,
+                      MB_TYPE_L1   | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
+                      MB_TYPE_L0L1                               | MB_TYPE_16x16,
+                      MB_TYPE_L0L1 | MB_TYPE_CBP                 | MB_TYPE_16x16,
+                      MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
+    0, //stuffing
+    MB_TYPE_INTRA4x4                | MB_TYPE_CBP,
+    MB_TYPE_INTRA4x4                | MB_TYPE_CBP | MB_TYPE_QUANT,
+};
+
+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
+    );
+    }
+}
+
+/***********************************************/
+/* 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, ff_h263_static_rl_table_store[0]);
+        init_rl(&rl_intra_aic, ff_h263_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);
+    }
+}
+
+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;
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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;
+}
diff --git a/libavcodec/ituh263enc.c b/libavcodec/ituh263enc.c
new file mode 100644 (file)
index 0000000..ce64497
--- /dev/null
@@ -0,0 +1,857 @@
+/*
+ * ITU H263 bitstream encoder
+ * Copyright (c) 2000,2001 Fabrice Bellard
+ * H263+ support.
+ * Copyright (c) 2001 Juan J. Sierralta P
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file libavcodec/ituh263enc.c
+ * h263 encoder.
+ */
+
+//#define DEBUG
+#include <limits.h>
+
+#include "dsputil.h"
+#include "avcodec.h"
+#include "mpegvideo.h"
+#include "h263.h"
+#include "mathops.h"
+#include "unary.h"
+#include "flv.h"
+#include "mpeg4video.h"
+
+//#undef NDEBUG
+//#include <assert.h>
+
+/**
+ * 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))
+
+static const uint8_t wrong_run[102] = {
+ 1,  2,  3,  5,  4, 10,  9,  8,
+11, 15, 17, 16, 23, 22, 21, 20,
+19, 18, 25, 24, 27, 26, 11,  7,
+ 6,  1,  2, 13,  2,  2,  2,  2,
+ 6, 12,  3,  9,  1,  3,  4,  3,
+ 7,  4,  1,  1,  5,  5, 14,  6,
+ 1,  7,  1,  8,  1,  1,  1,  1,
+10,  1,  1,  5,  9, 17, 25, 24,
+29, 33, 32, 41,  2, 23, 28, 31,
+ 3, 22, 30,  4, 27, 40,  8, 26,
+ 6, 39,  7, 38, 16, 37, 15, 10,
+11, 12, 13, 14,  1, 21, 20, 18,
+19,  2,  1, 34, 35, 36
+};
+
+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;
+}
+
+/**
+ * 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;
+            }
+        }
+    }
+}
+
+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);
+        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);
+    }
+}
+
+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++;
+        }
+    }
+}
+
+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, ff_h263_static_rl_table_store[0]);
+        init_rl(&rl_intra_aic, ff_h263_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;
+    }
+}
+
+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);
+}
index f748e5e..f791af2 100644 (file)
@@ -797,53 +797,6 @@ void ff_h261_encode_init(MpegEncContext *s);
 int ff_h261_get_picture_format(int width, int height);
 
 
-/* h263.c, h263dec.c */
-int ff_h263_decode_init(AVCodecContext *avctx);
-int ff_h263_decode_frame(AVCodecContext *avctx,
-                             void *data, int *data_size,
-                             AVPacket *avpkt);
-int ff_h263_decode_end(AVCodecContext *avctx);
-void h263_encode_mb(MpegEncContext *s,
-                    DCTELEM block[6][64],
-                    int motion_x, int motion_y);
-void h263_encode_picture_header(MpegEncContext *s, int picture_number);
-void h263_encode_gob_header(MpegEncContext * s, int mb_line);
-int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
-                        int *px, int *py);
-void h263_encode_init(MpegEncContext *s);
-void h263_decode_init_vlc(MpegEncContext *s);
-int h263_decode_picture_header(MpegEncContext *s);
-int ff_h263_decode_gob_header(MpegEncContext *s);
-void ff_h263_update_motion_val(MpegEncContext * s);
-void ff_h263_loop_filter(MpegEncContext * s);
-void ff_set_qscale(MpegEncContext * s, int qscale);
-int ff_h263_decode_mba(MpegEncContext *s);
-void ff_h263_encode_mba(MpegEncContext *s);
-
-/**
- * Prints picture info if FF_DEBUG_PICT_INFO is set.
- */
-void ff_h263_show_pict_info(MpegEncContext *s);
-
-int ff_intel_h263_decode_picture_header(MpegEncContext *s);
-int ff_h263_decode_mb(MpegEncContext *s,
-                      DCTELEM block[6][64]);
-
-/**
- * Returns the value of the 3bit "source format" syntax element.
- * that represents some standard picture dimensions or indicates that
- * width&height are explicitly stored later.
- */
-int av_const h263_get_picture_format(int width, int height);
-
-void ff_clean_h263_qscales(MpegEncContext *s);
-int ff_h263_resync(MpegEncContext *s);
-const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);
-int ff_h263_get_gob_height(MpegEncContext *s);
-void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
-void ff_init_qscale_tab(MpegEncContext *s);
-
-
 /* rv10.c */
 void rv10_encode_picture_header(MpegEncContext *s, int picture_number);
 int rv_decode_dc(MpegEncContext *s, int n);
index e1c5ed2..7b58aa8 100644 (file)
@@ -28,6 +28,7 @@
 #include "avcodec.h"
 #include "dsputil.h"
 #include "mpegvideo.h"
+#include "h263.h"
 
 //#define DEBUG
 
index 1ca42f2..1c5ac5d 100644 (file)
@@ -30,6 +30,7 @@
 #include "avcodec.h"
 #include "dsputil.h"
 #include "mpegvideo.h"
+#include "h263.h"
 
 #include "svq1.h"
 #include "svq1enc_cb.h"
index c7e2988..a2eb429 100644 (file)
@@ -21,6 +21,7 @@
 #include "avcodec.h"
 #include "dsputil.h"
 #include "mpegvideo.h"
+#include "h263.h"
 #include "mathops.h"
 #include "msmpeg4.h"
 #include "msmpeg4data.h"
index 7143643..84eedf3 100644 (file)
@@ -23,6 +23,7 @@
 #include "mpegvideo.h"
 #include "msmpeg4.h"
 #include "msmpeg4data.h"
+#include "h263.h"
 #include "wmv2.h"