* Copyright (c) 2001 Juan J. Sierralta P.
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
- * This library is free software; you can redistribute it and/or
+ * 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
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * ac prediction encoding, b-frame support, error resilience, optimizations,
- * qpel decoding, gmc decoding, interlaced decoding,
- * by Michael Niedermayer <michaelni@gmx.at>
*/
/**
//#define DEBUG
#include <limits.h>
-#include "common.h"
#include "dsputil.h"
#include "avcodec.h"
#include "mpegvideo.h"
static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block,
int n, int dc, uint8_t *scan_table,
PutBitContext *dc_pb, PutBitContext *ac_pb);
+static int mpeg4_get_block_length(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
+ uint8_t *scan_table);
#endif
static int h263_decode_motion(MpegEncContext * s, int pred, int fcode);
static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr);
static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
int n, int coded, int intra, int rvlc);
-static int mpeg4_get_block_length(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
- uint8_t *scan_table);
-static int h263_pred_dc(MpegEncContext * s, int n, uint16_t **dc_val_ptr);
#ifdef CONFIG_ENCODERS
+static int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
static void mpeg4_encode_visual_object_header(MpegEncContext * s);
static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number);
#endif //CONFIG_ENCODERS
static uint16_t uni_DCtab_lum_bits[512];
static uint16_t uni_DCtab_chrom_bits[512];
-static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
+static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
static uint8_t fcode_tab[MAX_MV*2+1];
static uint8_t umv_fcode_tab[MAX_MV*2+1];
*/
#endif
+static uint8_t static_rl_table_store[5][2][2*MAX_RUN + MAX_LEVEL + 3];
+
#if 0 //3IV1 is quite rare and it slows things down a tiny bit
-#define IS_3IV1 s->avctx->codec_tag == ff_get_fourcc("3IV1")
+#define IS_3IV1 s->codec_tag == ff_get_fourcc("3IV1")
#else
#define IS_3IV1 0
#endif
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= clip(1, div, 127);
- error= ABS(s->avctx->time_base.num*1800000LL - (1000LL+i)*s->avctx->time_base.den*div);
+ 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;
}
}
+/**
+ * init s->current_picture.qscale_table from s->lambda_table
+ */
+static void ff_init_qscale_tab(MpegEncContext *s){
+ int8_t * const qscale_table= s->current_picture.qscale_table;
+ int i;
+
+ for(i=0; i<s->mb_num; i++){
+ unsigned int lam= s->lambda_table[ s->mb_index2xy[i] ];
+ int qp= (lam*139 + FF_LAMBDA_SCALE*64) >> (FF_LAMBDA_SHIFT + 7);
+ qscale_table[ s->mb_index2xy[i] ]= av_clip(qp, s->avctx->qmin, s->avctx->qmax);
+ }
+}
+
/**
* modify qscale so that encoding is acually possible in h263 (limit difference to -2..2)
*/
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;
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_INTER4V;
s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_INTER;
}
}
for(i=1; i<s->mb_num; i++){
int mb_xy= s->mb_index2xy[i];
if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_DIRECT)){
- s->mb_type[mb_xy]&= ~CANDIDATE_MB_TYPE_DIRECT;
s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_BIDIR;
}
}
}
#endif //CONFIG_ENCODERS
+
+#define tab_size ((signed)(sizeof(s->direct_scale_mv[0])/sizeof(int16_t)))
+#define tab_bias (tab_size/2)
+
+void ff_mpeg4_init_direct_mv(MpegEncContext *s){
+ int i;
+ for(i=0; i<tab_size; i++){
+ s->direct_scale_mv[0][i] = (i-tab_bias)*s->pb_time/s->pp_time;
+ s->direct_scale_mv[1][i] = (i-tab_bias)*(s->pb_time-s->pp_time)/s->pp_time;
+ }
+}
+
+static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx, int my, int i){
+ int xy= s->block_index[i];
+ uint16_t time_pp= s->pp_time;
+ uint16_t time_pb= s->pb_time;
+ int p_mx, p_my;
+
+ p_mx= s->next_picture.motion_val[0][xy][0];
+ if((unsigned)(p_mx + tab_bias) < tab_size){
+ s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx;
+ s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
+ : s->direct_scale_mv[1][p_mx + tab_bias];
+ }else{
+ s->mv[0][i][0] = p_mx*time_pb/time_pp + mx;
+ s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
+ : p_mx*(time_pb - time_pp)/time_pp;
+ }
+ p_my= s->next_picture.motion_val[0][xy][1];
+ if((unsigned)(p_my + tab_bias) < tab_size){
+ s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my;
+ s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
+ : s->direct_scale_mv[1][p_my + tab_bias];
+ }else{
+ s->mv[0][i][1] = p_my*time_pb/time_pp + my;
+ s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
+ : p_my*(time_pb - time_pp)/time_pp;
+ }
+}
+
+#undef tab_size
+#undef tab_bias
+
/**
*
* @return the mb_type
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my){
const int mb_index= s->mb_x + s->mb_y*s->mb_stride;
const int colocated_mb_type= s->next_picture.mb_type[mb_index];
- int xy= s->block_index[0];
uint16_t time_pp= s->pp_time;
uint16_t time_pb= s->pb_time;
int i;
//FIXME avoid divides
+ // try special case with shifts for 1 and 3 B-frames?
if(IS_8X8(colocated_mb_type)){
s->mv_type = MV_TYPE_8X8;
for(i=0; i<4; i++){
- xy= s->block_index[i];
- s->mv[0][i][0] = s->next_picture.motion_val[0][xy][0]*time_pb/time_pp + mx;
- s->mv[0][i][1] = s->next_picture.motion_val[0][xy][1]*time_pb/time_pp + my;
- s->mv[1][i][0] = mx ? s->mv[0][i][0] - s->next_picture.motion_val[0][xy][0]
- : s->next_picture.motion_val[0][xy][0]*(time_pb - time_pp)/time_pp;
- s->mv[1][i][1] = my ? s->mv[0][i][1] - s->next_picture.motion_val[0][xy][1]
- : s->next_picture.motion_val[0][xy][1]*(time_pb - time_pp)/time_pp;
+ ff_mpeg4_set_one_direct_mv(s, mx, my, i);
}
return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
} else if(IS_INTERLACED(colocated_mb_type)){
s->mv_type = MV_TYPE_FIELD;
for(i=0; i<2; i++){
int field_select= s->next_picture.ref_index[0][s->block_index[2*i]];
+ s->field_select[0][i]= field_select;
+ s->field_select[1][i]= i;
if(s->top_field_first){
time_pp= s->pp_field_time - field_select + i;
time_pb= s->pb_field_time - field_select + i;
}
return MB_TYPE_DIRECT2 | MB_TYPE_16x8 | MB_TYPE_L0L1 | MB_TYPE_INTERLACED;
}else{
- s->mv[0][0][0] = s->mv[0][1][0] = s->mv[0][2][0] = s->mv[0][3][0] = s->next_picture.motion_val[0][xy][0]*time_pb/time_pp + mx;
- s->mv[0][0][1] = s->mv[0][1][1] = s->mv[0][2][1] = s->mv[0][3][1] = s->next_picture.motion_val[0][xy][1]*time_pb/time_pp + my;
- s->mv[1][0][0] = s->mv[1][1][0] = s->mv[1][2][0] = s->mv[1][3][0] = mx ? s->mv[0][0][0] - s->next_picture.motion_val[0][xy][0]
- : s->next_picture.motion_val[0][xy][0]*(time_pb - time_pp)/time_pp;
- s->mv[1][0][1] = s->mv[1][1][1] = s->mv[1][2][1] = s->mv[1][3][1] = my ? s->mv[0][0][1] - s->next_picture.motion_val[0][xy][1]
- : s->next_picture.motion_val[0][xy][1]*(time_pb - time_pp)/time_pp;
+ ff_mpeg4_set_one_direct_mv(s, mx, my, 0);
+ s->mv[0][1][0] = s->mv[0][2][0] = s->mv[0][3][0] = s->mv[0][0][0];
+ s->mv[0][1][1] = s->mv[0][2][1] = s->mv[0][3][1] = s->mv[0][0][1];
+ s->mv[1][1][0] = s->mv[1][2][0] = s->mv[1][3][0] = s->mv[1][0][0];
+ s->mv[1][1][1] = s->mv[1][2][1] = s->mv[1][3][1] = s->mv[1][0][1];
if((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) || !s->quarter_sample)
s->mv_type= MV_TYPE_16X16;
else
int cbpc, cbpy, i, cbp, pred_x, pred_y;
int16_t pred_dc;
int16_t rec_intradc[6];
- uint16_t *dc_ptr[6];
+ int16_t *dc_ptr[6];
const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1);
const int dquant_code[5]= {1,0,9,2,3};
}
}
-static int h263_pred_dc(MpegEncContext * s, int n, uint16_t **dc_val_ptr)
+#ifdef CONFIG_ENCODERS
+static int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
{
int x, y, wrap, a, c, pred_dc, scale;
int16_t *dc_val;
*dc_val_ptr = &dc_val[x + y * wrap];
return pred_dc;
}
+#endif /* CONFIG_ENCODERS */
static void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n)
{
int f_code;
int mv;
- if(mv_penalty==NULL)
- mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
-
for(f_code=1; f_code<=MAX_FCODE; f_code++){
for(mv=-MAX_MV; mv<=MAX_MV; mv++){
int len;
init_uni_dc_tab();
- init_rl(&rl_inter, 1);
- init_rl(&rl_intra, 1);
- init_rl(&rl_intra_aic, 1);
+ init_rl(&rl_inter, static_rl_table_store[0]);
+ init_rl(&rl_intra, static_rl_table_store[1]);
+ init_rl(&rl_intra_aic, static_rl_table_store[2]);
init_uni_mpeg4_rl_tab(&rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
init_uni_mpeg4_rl_tab(&rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
if(s->pict_type==B_TYPE){
s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
assert(s->pb_time > 0 && s->pb_time < s->pp_time);
+ ff_mpeg4_init_direct_mv(s);
}else{
s->last_time_base= s->time_base;
s->time_base= time_div;
#endif //CONFIG_ENCODERS
/**
- * set qscale and update qscale dependant variables.
+ * set qscale and update qscale dependent variables.
*/
void ff_set_qscale(MpegEncContext * s, int qscale)
{
static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
{
int a, b, c, wrap, pred, scale, ret;
- uint16_t *dc_val;
+ int16_t *dc_val;
/* find prediction */
if (n < 4) {
init_vlc(&mv_vlc, MV_VLC_BITS, 33,
&mvtab[0][1], 2, 1,
&mvtab[0][0], 2, 1, 1);
- init_rl(&rl_inter, 1);
- init_rl(&rl_intra, 1);
- init_rl(&rvlc_rl_inter, 1);
- init_rl(&rvlc_rl_intra, 1);
- init_rl(&rl_intra_aic, 1);
+ init_rl(&rl_inter, static_rl_table_store[0]);
+ init_rl(&rl_intra, static_rl_table_store[1]);
+ init_rl(&rvlc_rl_inter, static_rl_table_store[3]);
+ init_rl(&rvlc_rl_intra, static_rl_table_store[4]);
+ init_rl(&rl_intra_aic, static_rl_table_store[2]);
init_vlc_rl(&rl_inter, 1);
init_vlc_rl(&rl_intra, 1);
init_vlc_rl(&rvlc_rl_inter, 1);
* @return 0 if not
*/
static inline int mpeg4_is_resync(MpegEncContext *s){
- const int bits_count= get_bits_count(&s->gb);
+ int bits_count= get_bits_count(&s->gb);
+ int v= show_bits(&s->gb, 16);
if(s->workaround_bugs&FF_BUG_NO_PADDING){
return 0;
}
+ while(v<=0xFF){
+ if(s->pict_type==B_TYPE || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
+ break;
+ skip_bits(&s->gb, 8+s->pict_type);
+ bits_count+= 8+s->pict_type;
+ v= show_bits(&s->gb, 16);
+ }
+
if(bits_count + 8 >= s->gb.size_in_bits){
- int v= show_bits(&s->gb, 8);
+ v>>=8;
v|= 0x7F >> (7-(bits_count&7));
if(v==0x7F)
return 1;
}else{
- if(show_bits(&s->gb, 16) == ff_mpeg4_resync_prefix[bits_count&7]){
+ if(v == ff_mpeg4_resync_prefix[bits_count&7]){
int len;
GetBitContext gb= s->gb;
if(ret>=0)
return 0;
}
- //ok, it's not where its supposed to be ...
+ //OK, it's not where it is supposed to be ...
s->gb= s->last_resync_gb;
align_get_bits(&s->gb);
left= s->gb.size_in_bits - get_bits_count(&s->gb);
mb_type= s->current_picture.mb_type[xy];
cbp = s->cbp_table[xy];
+ s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
+
if(s->current_picture.qscale_table[xy] != s->qscale){
ff_set_qscale(s, s->current_picture.qscale_table[xy] );
}
return -1;
}
cbp = (cbpc & 3) | (cbpy << 2);
+
+ s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
+
if (dquant) {
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
}
i += run;
if (i >= 64){
if(s->alt_inter_vlc && rl == &rl_inter && !s->mb_intra){
- //looks like a hack but no, it's the way its supposed to work ...
+ //Looks like a hack but no, it's the way it is supposed to work ...
rl = &rl_intra_aic;
i = 0;
s->gb= gb;
//Note intra & rvlc should be optimized away if this is inlined
if(intra) {
- if(s->qscale < s->intra_dc_threshold){
+ if(s->use_intra_dc_vlc){
/* DC coef */
if(s->partitioned_frame){
level = s->dc_val[0][ s->block_index[n] ];
#if 0
if(s->error_resilience >= FF_ER_COMPLIANT){
- const int abs_level= ABS(level);
+ const int abs_level= FFABS(level);
if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
const int run1= run - rl->max_run[last][abs_level] - 1;
if(abs_level <= rl->max_level[last][run]){
}
not_coded:
if (intra) {
- if(s->qscale >= s->intra_dc_threshold){
+ if(!s->use_intra_dc_vlc){
block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
i -= i>>31; //if(i == -1) i=0;
if (ufep == 1) {
/* OPPTYPE */
format = get_bits(&s->gb, 3);
- dprintf("ufep=1, format: %d\n", format);
+ dprintf(s->avctx, "ufep=1, format: %d\n", format);
s->custom_pcf= get_bits1(&s->gb);
s->umvplus = get_bits(&s->gb, 1); /* Unrestricted Motion Vector */
if (get_bits1(&s->gb) != 0) {
if (format == 6) {
/* Custom Picture Format (CPFMT) */
s->aspect_ratio_info = get_bits(&s->gb, 4);
- dprintf("aspect: %d\n", s->aspect_ratio_info);
+ dprintf(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
/* aspect ratios:
0 - forbidden
1 - 1:1
width = (get_bits(&s->gb, 9) + 1) * 4;
skip_bits1(&s->gb);
height = get_bits(&s->gb, 9) * 4;
- dprintf("\nH.263+ Custom picture: %dx%d\n",width,height);
+ 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);
);
}
#if 1
- if (s->pict_type == I_TYPE && s->avctx->codec_tag == ff_get_fourcc("ZYGO")){
+ if (s->pict_type == I_TYPE && s->codec_tag == ff_get_fourcc("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");
skip_bits1(gb); /* marker */
height = get_bits(gb, 13);
skip_bits1(gb); /* marker */
- if(width && height && !(s->width && s->avctx->codec_tag == ff_get_fourcc("MP4S"))){ /* they should be non zero but who knows ... */
+ if(width && height && !(s->width && s->codec_tag == ff_get_fourcc("MP4S"))){ /* they should be non zero but who knows ... */
s->width = width;
s->height = height;
// printf("width/height: %d %d\n", width, height);
skip_bits1(gb); /* marker */
}
s->num_sprite_warping_points= get_bits(gb, 6);
+ if(s->num_sprite_warping_points > 3){
+ av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
+ s->num_sprite_warping_points= 0;
+ return -1;
+ }
s->sprite_warping_accuracy = get_bits(gb, 2);
s->sprite_brightness_change= get_bits1(gb);
if(s->vol_sprite_usage==STATIC_SPRITE)
int ver = 0, build = 0, ver2 = 0, ver3 = 0;
char last;
- for(i=0; i<255 && gb->index < gb->size_in_bits; i++){
+ for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
if(show_bits(gb, 23) == 0) break;
buf[i]= get_bits(gb, 8);
}
// printf("messed up order, maybe after seeking? skipping current b frame\n");
return FRAME_SKIPPED;
}
+ ff_mpeg4_init_direct_mv(s);
if(s->t_frame==0) s->t_frame= s->pb_time;
if(s->t_frame==0) s->t_frame=1; // 1/0 protection
- ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
- ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
+ if(!s->progressive_sequence){
+ if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
+ return FRAME_SKIPPED;
+ }
}
-//av_log(s->avctx, AV_LOG_DEBUG, "last nonb %Ld last_base %d time %Ld pp %d pb %d t %d ppf %d pbf %d\n", s->last_non_b_time, s->last_time_base, s->time, s->pp_time, s->pb_time, s->t_frame, s->pp_field_time, s->pb_field_time);
+//av_log(s->avctx, AV_LOG_DEBUG, "last nonb %"PRId64" last_base %d time %"PRId64" pp %d pb %d t %d ppf %d pbf %d\n", s->last_non_b_time, s->last_time_base, s->time, s->pp_time, s->pb_time, s->t_frame, s->pp_field_time, s->pb_field_time);
if(s->avctx->time_base.num)
s->current_picture_ptr->pts= (s->time + s->avctx->time_base.num/2) / s->avctx->time_base.num;
av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
return FRAME_SKIPPED;
}
-//printf("time %d %d %d || %Ld %Ld %Ld\n", s->time_increment_bits, s->avctx->time_base.den, s->time_base,
+//printf("time %d %d %d || %"PRId64" %"PRId64" %"PRId64"\n", s->time_increment_bits, s->avctx->time_base.den, s->time_base,
//s->time, s->last_non_b_time, s->last_non_b_time - s->pp_time);
if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == P_TYPE
|| (s->pict_type == S_TYPE && s->vol_sprite_usage==GMC_SPRITE))) {
/* search next start code */
align_get_bits(gb);
- if(s->avctx->codec_tag == ff_get_fourcc("WV1F") && show_bits(gb, 24) == 0x575630){
+ if(s->codec_tag == ff_get_fourcc("WV1F") && show_bits(gb, 24) == 0x575630){
skip_bits(gb, 24);
if(get_bits(gb, 8) == 0xF0)
return decode_vop_header(s, gb);
projects / ffmpeg / blobdiff