3 * Copyright (c) 2001 Fabrice Bellard.
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 #include "mpegvideo.h"
33 //#define PRINT_FRAME_TIME
35 int ff_h263_decode_init(AVCodecContext *avctx)
37 MpegEncContext *s = avctx->priv_data;
40 s->out_format = FMT_H263;
42 s->width = avctx->coded_width;
43 s->height = avctx->coded_height;
44 s->workaround_bugs= avctx->workaround_bugs;
47 MPV_decode_defaults(s);
49 s->decode_mb= ff_h263_decode_mb;
51 avctx->pix_fmt= PIX_FMT_YUV420P;
52 s->unrestricted_mv= 1;
54 /* select sub codec */
55 switch(avctx->codec->id) {
57 s->unrestricted_mv= 0;
60 s->decode_mb= ff_mpeg4_decode_mb;
61 s->time_increment_bits = 4; /* default value for broken headers */
63 s->low_delay = 0; //default, might be overriden in the vol header during header parsing
65 case CODEC_ID_MSMPEG4V1:
70 case CODEC_ID_MSMPEG4V2:
75 case CODEC_ID_MSMPEG4V3:
104 s->codec_id= avctx->codec->id;
106 /* for h263, we allocate the images after having read the header */
107 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
108 if (MPV_common_init(s) < 0)
112 ff_msmpeg4_decode_init(s);
114 h263_decode_init_vlc(s);
119 int ff_h263_decode_end(AVCodecContext *avctx)
121 MpegEncContext *s = avctx->priv_data;
128 * returns the number of bytes consumed for building the current frame
130 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
131 int pos= (get_bits_count(&s->gb)+7)>>3;
134 //we would have to scan through the whole buf to handle the weird reordering ...
136 }else if(s->flags&CODEC_FLAG_TRUNCATED){
137 pos -= s->parse_context.last_index;
138 if(pos<0) pos=0; // padding is not really read so this might be -1
141 if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
142 if(pos+10>buf_size) pos=buf_size; // oops ;)
148 static int decode_slice(MpegEncContext *s){
149 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
150 const int mb_size= 16>>s->avctx->lowres;
151 s->last_resync_gb= s->gb;
152 s->first_slice_line= 1;
154 s->resync_mb_x= s->mb_x;
155 s->resync_mb_y= s->mb_y;
157 ff_set_qscale(s, s->qscale);
159 if(s->partitioned_frame){
160 const int qscale= s->qscale;
162 if(s->codec_id==CODEC_ID_MPEG4){
163 if(ff_mpeg4_decode_partitions(s) < 0)
167 /* restore variables which were modified */
168 s->first_slice_line=1;
169 s->mb_x= s->resync_mb_x;
170 s->mb_y= s->resync_mb_y;
171 ff_set_qscale(s, qscale);
174 for(; s->mb_y < s->mb_height; s->mb_y++) {
175 /* per-row end of slice checks */
176 if(s->msmpeg4_version){
177 if(s->resync_mb_y + s->slice_height == s->mb_y){
178 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
184 if(s->msmpeg4_version==1){
190 ff_init_block_index(s);
191 for(; s->mb_x < s->mb_width; s->mb_x++) {
194 ff_update_block_index(s);
196 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
197 s->first_slice_line=0;
202 s->mv_dir = MV_DIR_FORWARD;
203 s->mv_type = MV_TYPE_16X16;
204 // s->mb_skipped = 0;
205 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
206 ret= s->decode_mb(s, s->block);
208 if (s->pict_type!=B_TYPE)
209 ff_h263_update_motion_val(s);
212 const int xy= s->mb_x + s->mb_y*s->mb_stride;
214 MPV_decode_mb(s, s->block);
216 ff_h263_loop_filter(s);
218 //printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24));
219 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
221 s->padding_bug_score--;
223 if(++s->mb_x >= s->mb_width){
225 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
229 }else if(ret==SLICE_NOEND){
230 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
231 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
234 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
235 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
240 MPV_decode_mb(s, s->block);
242 ff_h263_loop_filter(s);
245 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
250 assert(s->mb_x==0 && s->mb_y==s->mb_height);
252 /* try to detect the padding bug */
253 if( s->codec_id==CODEC_ID_MPEG4
254 && (s->workaround_bugs&FF_BUG_AUTODETECT)
255 && s->gb.size_in_bits - get_bits_count(&s->gb) >=0
256 && s->gb.size_in_bits - get_bits_count(&s->gb) < 48
257 // && !s->resync_marker
258 && !s->data_partitioning){
260 const int bits_count= get_bits_count(&s->gb);
261 const int bits_left = s->gb.size_in_bits - bits_count;
264 s->padding_bug_score+=16;
265 } else if(bits_left != 1){
266 int v= show_bits(&s->gb, 8);
267 v|= 0x7F >> (7-(bits_count&7));
269 if(v==0x7F && bits_left<=8)
270 s->padding_bug_score--;
271 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
272 s->padding_bug_score+= 4;
274 s->padding_bug_score++;
278 if(s->workaround_bugs&FF_BUG_AUTODETECT){
279 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
280 s->workaround_bugs |= FF_BUG_NO_PADDING;
282 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
285 // handle formats which don't have unique end markers
286 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
287 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
290 /* no markers in M$ crap */
291 if(s->msmpeg4_version && s->pict_type==I_TYPE)
294 /* buggy padding but the frame should still end approximately at the bitstream end */
295 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
297 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
298 max_extra+= 256*256*256*64;
301 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
304 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
306 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
311 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
312 s->gb.size_in_bits - get_bits_count(&s->gb),
313 show_bits(&s->gb, 24), s->padding_bug_score);
315 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
321 * finds the end of the current frame in the bitstream.
322 * @return the position of the first byte of the next frame, or -1
324 int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
328 vop_found= pc->frame_start_found;
333 for(i=0; i<buf_size; i++){
334 state= (state<<8) | buf[i];
344 /* EOF considered as end of frame */
347 for(; i<buf_size; i++){
348 state= (state<<8) | buf[i];
349 if((state&0xFFFFFF00) == 0x100){
350 pc->frame_start_found=0;
356 pc->frame_start_found= vop_found;
358 return END_NOT_FOUND;
361 static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
365 vop_found= pc->frame_start_found;
370 for(i=0; i<buf_size; i++){
371 state= (state<<8) | buf[i];
372 if(state>>(32-22) == 0x20){
381 for(; i<buf_size; i++){
382 state= (state<<8) | buf[i];
383 if(state>>(32-22) == 0x20){
384 pc->frame_start_found=0;
390 pc->frame_start_found= vop_found;
393 return END_NOT_FOUND;
396 #ifdef CONFIG_H263_PARSER
397 static int h263_parse(AVCodecParserContext *s,
398 AVCodecContext *avctx,
399 uint8_t **poutbuf, int *poutbuf_size,
400 const uint8_t *buf, int buf_size)
402 ParseContext *pc = s->priv_data;
405 next= h263_find_frame_end(pc, buf, buf_size);
407 if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
413 *poutbuf = (uint8_t *)buf;
414 *poutbuf_size = buf_size;
419 int ff_h263_decode_frame(AVCodecContext *avctx,
420 void *data, int *data_size,
421 uint8_t *buf, int buf_size)
423 MpegEncContext *s = avctx->priv_data;
425 AVFrame *pict = data;
427 #ifdef PRINT_FRAME_TIME
428 uint64_t time= rdtsc();
431 av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
432 av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
434 s->flags= avctx->flags;
435 s->flags2= avctx->flags2;
437 /* no supplementary picture */
439 /* special case for last picture */
440 if (s->low_delay==0 && s->next_picture_ptr) {
441 *pict= *(AVFrame*)s->next_picture_ptr;
442 s->next_picture_ptr= NULL;
444 *data_size = sizeof(AVFrame);
450 if(s->flags&CODEC_FLAG_TRUNCATED){
453 if(s->codec_id==CODEC_ID_MPEG4){
454 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
455 }else if(s->codec_id==CODEC_ID_H263){
456 next= h263_find_frame_end(&s->parse_context, buf, buf_size);
458 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
462 if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
469 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
470 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
472 init_get_bits(&s->gb, buf, buf_size*8);
473 s->bitstream_buffer_size=0;
475 if (!s->context_initialized) {
476 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
480 //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
481 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
482 int i= ff_find_unused_picture(s, 0);
483 s->current_picture_ptr= &s->picture[i];
487 if (s->msmpeg4_version==5) {
488 ret= ff_wmv2_decode_picture_header(s);
489 } else if (s->msmpeg4_version) {
490 ret = msmpeg4_decode_picture_header(s);
491 } else if (s->h263_pred) {
492 if(s->avctx->extradata_size && s->picture_number==0){
495 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
496 ret = ff_mpeg4_decode_picture_header(s, &gb);
498 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
500 if(s->flags& CODEC_FLAG_LOW_DELAY)
502 } else if (s->codec_id == CODEC_ID_H263I) {
503 ret = intel_h263_decode_picture_header(s);
504 } else if (s->h263_flv) {
505 ret = flv_h263_decode_picture_header(s);
507 ret = h263_decode_picture_header(s);
510 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
512 /* skip if the header was thrashed */
514 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
518 avctx->has_b_frames= !s->low_delay;
520 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
521 if(s->stream_codec_tag == ff_get_fourcc("XVID") ||
522 s->codec_tag == ff_get_fourcc("XVID") || s->codec_tag == ff_get_fourcc("XVIX") ||
523 s->codec_tag == ff_get_fourcc("RMP4"))
526 if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
527 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
532 if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
533 if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
534 s->divx_version= 400; //divx 4
537 if(s->xvid_build && s->divx_version){
542 if(s->workaround_bugs&FF_BUG_AUTODETECT){
543 if(s->codec_tag == ff_get_fourcc("XVIX"))
544 s->workaround_bugs|= FF_BUG_XVID_ILACE;
546 if(s->codec_tag == ff_get_fourcc("UMP4")){
547 s->workaround_bugs|= FF_BUG_UMP4;
550 if(s->divx_version>=500){
551 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
554 if(s->divx_version>502){
555 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
558 if(s->xvid_build && s->xvid_build<=3)
559 s->padding_bug_score= 256*256*256*64;
561 if(s->xvid_build && s->xvid_build<=1)
562 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
564 if(s->xvid_build && s->xvid_build<=12)
565 s->workaround_bugs|= FF_BUG_EDGE;
567 if(s->xvid_build && s->xvid_build<=32)
568 s->workaround_bugs|= FF_BUG_DC_CLIP;
570 #define SET_QPEL_FUNC(postfix1, postfix2) \
571 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
572 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
573 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
575 if(s->lavc_build && s->lavc_build<4653)
576 s->workaround_bugs|= FF_BUG_STD_QPEL;
578 if(s->lavc_build && s->lavc_build<4655)
579 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
581 if(s->lavc_build && s->lavc_build<4670){
582 s->workaround_bugs|= FF_BUG_EDGE;
585 if(s->lavc_build && s->lavc_build<=4712)
586 s->workaround_bugs|= FF_BUG_DC_CLIP;
589 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
590 //printf("padding_bug_score: %d\n", s->padding_bug_score);
591 if(s->divx_version==501 && s->divx_build==20020416)
592 s->padding_bug_score= 256*256*256*64;
594 if(s->divx_version && s->divx_version<500){
595 s->workaround_bugs|= FF_BUG_EDGE;
599 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
601 if(s->divx_version==500)
602 s->padding_bug_score= 256*256*256*64;
604 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
605 * lets hope this at least works
607 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
608 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
609 s->workaround_bugs|= FF_BUG_NO_PADDING;
611 if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
612 s->workaround_bugs|= FF_BUG_NO_PADDING;
616 if(s->workaround_bugs& FF_BUG_STD_QPEL){
617 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
618 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
619 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
620 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
621 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
622 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
624 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
625 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
626 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
627 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
628 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
629 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
632 if(avctx->debug & FF_DEBUG_BUGS)
633 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
634 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
635 s->divx_packed ? "p" : "");
637 #if 0 // dump bits per frame / qp / complexity
640 if(!f) f=fopen("rate_qp_cplx.txt", "w");
641 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
645 #if defined(HAVE_MMX) && defined(CONFIG_GPL)
646 if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX)){
647 avctx->idct_algo= FF_IDCT_XVIDMMX;
648 avctx->coded_width= 0; // force reinit
649 // dsputil_init(&s->dsp, avctx);
654 /* After H263 & mpeg4 header decode we have the height, width,*/
655 /* and other parameters. So then we could init the picture */
656 /* FIXME: By the way H263 decoder is evolving it should have */
657 /* an H263EncContext */
659 if ( s->width != avctx->coded_width
660 || s->height != avctx->coded_height) {
661 /* H.263 could change picture size any time */
662 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
663 s->parse_context.buffer=0;
665 s->parse_context= pc;
667 if (!s->context_initialized) {
668 avcodec_set_dimensions(avctx, s->width, s->height);
673 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
674 s->gob_index = ff_h263_get_gob_height(s);
677 s->current_picture.pict_type= s->pict_type;
678 s->current_picture.key_frame= s->pict_type == I_TYPE;
680 /* skip B-frames if we don't have reference frames */
681 if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
682 /* skip b frames if we are in a hurry */
683 if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
684 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
685 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
686 || avctx->skip_frame >= AVDISCARD_ALL)
687 return get_consumed_bytes(s, buf_size);
688 /* skip everything if we are in a hurry>=5 */
689 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
691 if(s->next_p_frame_damaged){
692 if(s->pict_type==B_TYPE)
693 return get_consumed_bytes(s, buf_size);
695 s->next_p_frame_damaged=0;
698 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==B_TYPE){
699 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
700 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
701 }else if((!s->no_rounding) || s->pict_type==B_TYPE){
702 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
703 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
705 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
706 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
709 if(MPV_frame_start(s, avctx) < 0)
713 av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
716 ff_er_frame_start(s);
718 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
719 //which isnt available before MPV_frame_start()
720 if (s->msmpeg4_version==5){
721 if(ff_wmv2_decode_secondary_picture_header(s) < 0)
725 /* decode each macroblock */
730 while(s->mb_y<s->mb_height){
731 if(s->msmpeg4_version){
732 if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
735 if(ff_h263_resync(s)<0)
739 if(s->msmpeg4_version<4 && s->h263_pred)
740 ff_mpeg4_clean_buffers(s);
745 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
746 if(msmpeg4_decode_ext_header(s, buf_size) < 0){
747 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
750 /* divx 5.01+ bistream reorder stuff */
751 if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
752 int current_pos= get_bits_count(&s->gb)>>3;
753 int startcode_found=0;
755 if(buf_size - current_pos > 5){
757 for(i=current_pos; i<buf_size-3; i++){
758 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
764 if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
770 s->bitstream_buffer= av_fast_realloc(
772 &s->allocated_bitstream_buffer_size,
773 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
774 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
775 s->bitstream_buffer_size= buf_size - current_pos;
783 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
784 assert(s->current_picture.pict_type == s->pict_type);
785 if (s->pict_type == B_TYPE || s->low_delay) {
786 *pict= *(AVFrame*)s->current_picture_ptr;
787 } else if (s->last_picture_ptr != NULL) {
788 *pict= *(AVFrame*)s->last_picture_ptr;
791 if(s->last_picture_ptr || s->low_delay){
792 *data_size = sizeof(AVFrame);
793 ff_print_debug_info(s, pict);
796 /* Return the Picture timestamp as the frame number */
797 /* we substract 1 because it is added on utils.c */
798 avctx->frame_number = s->picture_number - 1;
800 #ifdef PRINT_FRAME_TIME
801 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
804 return get_consumed_bytes(s, buf_size);
807 AVCodec mpeg4_decoder = {
811 sizeof(MpegEncContext),
815 ff_h263_decode_frame,
816 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
817 .flush= ff_mpeg_flush,
820 AVCodec h263_decoder = {
824 sizeof(MpegEncContext),
828 ff_h263_decode_frame,
829 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
830 .flush= ff_mpeg_flush,
833 AVCodec msmpeg4v1_decoder = {
837 sizeof(MpegEncContext),
841 ff_h263_decode_frame,
842 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
845 AVCodec msmpeg4v2_decoder = {
849 sizeof(MpegEncContext),
853 ff_h263_decode_frame,
854 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
857 AVCodec msmpeg4v3_decoder = {
861 sizeof(MpegEncContext),
865 ff_h263_decode_frame,
866 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
869 AVCodec wmv1_decoder = {
873 sizeof(MpegEncContext),
877 ff_h263_decode_frame,
878 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
881 AVCodec h263i_decoder = {
885 sizeof(MpegEncContext),
889 ff_h263_decode_frame,
890 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
893 AVCodec flv_decoder = {
897 sizeof(MpegEncContext),
901 ff_h263_decode_frame,
902 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
905 #ifdef CONFIG_H263_PARSER
906 AVCodecParser h263_parser = {
908 sizeof(ParseContext),