h263dec.c
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1 /*
2  * H.263 decoder
3  * Copyright (c) 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of Libav.
7  *
8  * Libav 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.
12  *
13  * Libav 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.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
28 #include "libavutil/cpu.h"
29 #include "internal.h"
30 #include "avcodec.h"
31 #include "dsputil.h"
32 #include "mpegvideo.h"
33 #include "h263.h"
34 #include "h263_parser.h"
35 #include "mpeg4video_parser.h"
36 #include "msmpeg4.h"
37 #include "vdpau_internal.h"
38 #include "thread.h"
39 #include "flv.h"
40 #include "mpeg4video.h"
41 
42 //#define DEBUG
43 //#define PRINT_FRAME_TIME
44 
46 {
47  MpegEncContext *s = avctx->priv_data;
48 
49  s->avctx = avctx;
50  s->out_format = FMT_H263;
51 
52  s->width = avctx->coded_width;
53  s->height = avctx->coded_height;
55 
56  // set defaults
58  s->quant_precision=5;
60  s->low_delay= 1;
61  avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
62  s->unrestricted_mv= 1;
63 
64  /* select sub codec */
65  switch(avctx->codec->id) {
66  case CODEC_ID_H263:
67  s->unrestricted_mv= 0;
69  break;
70  case CODEC_ID_MPEG4:
71  break;
72  case CODEC_ID_MSMPEG4V1:
73  s->h263_pred = 1;
74  s->msmpeg4_version=1;
75  break;
76  case CODEC_ID_MSMPEG4V2:
77  s->h263_pred = 1;
78  s->msmpeg4_version=2;
79  break;
80  case CODEC_ID_MSMPEG4V3:
81  s->h263_pred = 1;
82  s->msmpeg4_version=3;
83  break;
84  case CODEC_ID_WMV1:
85  s->h263_pred = 1;
86  s->msmpeg4_version=4;
87  break;
88  case CODEC_ID_WMV2:
89  s->h263_pred = 1;
90  s->msmpeg4_version=5;
91  break;
92  case CODEC_ID_VC1:
93  case CODEC_ID_WMV3:
94  case CODEC_ID_VC1IMAGE:
95  case CODEC_ID_WMV3IMAGE:
96  s->h263_pred = 1;
97  s->msmpeg4_version=6;
99  break;
100  case CODEC_ID_H263I:
101  break;
102  case CODEC_ID_FLV1:
103  s->h263_flv = 1;
104  break;
105  default:
106  return -1;
107  }
108  s->codec_id= avctx->codec->id;
109  avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
110 
111  /* for h263, we allocate the images after having read the header */
112  if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
113  if (MPV_common_init(s) < 0)
114  return -1;
115 
117 
118  return 0;
119 }
120 
122 {
123  MpegEncContext *s = avctx->priv_data;
124 
125  MPV_common_end(s);
126  return 0;
127 }
128 
132 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
133  int pos= (get_bits_count(&s->gb)+7)>>3;
134 
135  if(s->divx_packed || s->avctx->hwaccel){
136  //we would have to scan through the whole buf to handle the weird reordering ...
137  return buf_size;
138  }else if(s->flags&CODEC_FLAG_TRUNCATED){
139  pos -= s->parse_context.last_index;
140  if(pos<0) pos=0; // padding is not really read so this might be -1
141  return pos;
142  }else{
143  if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
144  if(pos+10>buf_size) pos=buf_size; // oops ;)
145 
146  return pos;
147  }
148 }
149 
151  const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
152  const int mb_size= 16>>s->avctx->lowres;
153  s->last_resync_gb= s->gb;
154  s->first_slice_line= 1;
155 
156  s->resync_mb_x= s->mb_x;
157  s->resync_mb_y= s->mb_y;
158 
159  ff_set_qscale(s, s->qscale);
160 
161  if (s->avctx->hwaccel) {
162  const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
163  const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
164  skip_bits_long(&s->gb, 8*(end - start));
165  return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
166  }
167 
168  if(s->partitioned_frame){
169  const int qscale= s->qscale;
170 
172  if(ff_mpeg4_decode_partitions(s) < 0)
173  return -1;
174  }
175 
176  /* restore variables which were modified */
177  s->first_slice_line=1;
178  s->mb_x= s->resync_mb_x;
179  s->mb_y= s->resync_mb_y;
180  ff_set_qscale(s, qscale);
181  }
182 
183  for(; s->mb_y < s->mb_height; s->mb_y++) {
184  /* per-row end of slice checks */
185  if(s->msmpeg4_version){
186  if(s->resync_mb_y + s->slice_height == s->mb_y){
188 
189  return 0;
190  }
191  }
192 
193  if(s->msmpeg4_version==1){
194  s->last_dc[0]=
195  s->last_dc[1]=
196  s->last_dc[2]= 128;
197  }
198 
200  for(; s->mb_x < s->mb_width; s->mb_x++) {
201  int ret;
202 
204 
205  if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
206  s->first_slice_line=0;
207  }
208 
209  /* DCT & quantize */
210 
211  s->mv_dir = MV_DIR_FORWARD;
212  s->mv_type = MV_TYPE_16X16;
213 // s->mb_skipped = 0;
214 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
215  ret= s->decode_mb(s, s->block);
216 
219 
220  if(ret<0){
221  const int xy= s->mb_x + s->mb_y*s->mb_stride;
222  if(ret==SLICE_END){
223  MPV_decode_mb(s, s->block);
224  if(s->loop_filter)
226 
227 //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));
228  ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
229 
230  s->padding_bug_score--;
231 
232  if(++s->mb_x >= s->mb_width){
233  s->mb_x=0;
234  ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
236  s->mb_y++;
237  }
238  return 0;
239  }else if(ret==SLICE_NOEND){
240  av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
241  ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask);
242  return -1;
243  }
244  av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
245  ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
246 
247  return -1;
248  }
249 
250  MPV_decode_mb(s, s->block);
251  if(s->loop_filter)
253  }
254 
255  ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
257 
258  s->mb_x= 0;
259  }
260 
261  assert(s->mb_x==0 && s->mb_y==s->mb_height);
262 
263  if(s->codec_id==CODEC_ID_MPEG4
265  && get_bits_left(&s->gb) >= 48
266  && show_bits(&s->gb, 24)==0x4010
267  && !s->data_partitioning)
268  s->padding_bug_score+=32;
269 
270  /* try to detect the padding bug */
271  if( s->codec_id==CODEC_ID_MPEG4
273  && get_bits_left(&s->gb) >=0
274  && get_bits_left(&s->gb) < 48
275 // && !s->resync_marker
276  && !s->data_partitioning){
277 
278  const int bits_count= get_bits_count(&s->gb);
279  const int bits_left = s->gb.size_in_bits - bits_count;
280 
281  if(bits_left==0){
282  s->padding_bug_score+=16;
283  } else if(bits_left != 1){
284  int v= show_bits(&s->gb, 8);
285  v|= 0x7F >> (7-(bits_count&7));
286 
287  if(v==0x7F && bits_left<=8)
288  s->padding_bug_score--;
289  else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
290  s->padding_bug_score+= 4;
291  else
292  s->padding_bug_score++;
293  }
294  }
295 
297  if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
299  else
301  }
302 
303  // handle formats which don't have unique end markers
304  if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
305  int left= get_bits_left(&s->gb);
306  int max_extra=7;
307 
308  /* no markers in M$ crap */
310  max_extra+= 17;
311 
312  /* buggy padding but the frame should still end approximately at the bitstream end */
314  max_extra+= 48;
315  else if((s->workaround_bugs&FF_BUG_NO_PADDING))
316  max_extra+= 256*256*256*64;
317 
318  if(left>max_extra){
319  av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
320  }
321  else if(left<0){
322  av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
323  }else
325 
326  return 0;
327  }
328 
329  av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
330  get_bits_left(&s->gb),
331  show_bits(&s->gb, 24), s->padding_bug_score);
332 
333  ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
334 
335  return -1;
336 }
337 
339  void *data, int *data_size,
340  AVPacket *avpkt)
341 {
342  const uint8_t *buf = avpkt->data;
343  int buf_size = avpkt->size;
344  MpegEncContext *s = avctx->priv_data;
345  int ret;
346  AVFrame *pict = data;
347 
348 #ifdef PRINT_FRAME_TIME
349 uint64_t time= rdtsc();
350 #endif
351  s->flags= avctx->flags;
352  s->flags2= avctx->flags2;
353 
354  /* no supplementary picture */
355  if (buf_size == 0) {
356  /* special case for last picture */
357  if (s->low_delay==0 && s->next_picture_ptr) {
358  *pict= *(AVFrame*)s->next_picture_ptr;
360 
361  *data_size = sizeof(AVFrame);
362  }
363 
364  return 0;
365  }
366 
368  int next;
369 
371  next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
372  }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
373  next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
374  }else{
375  av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
376  return -1;
377  }
378 
379  if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
380  return buf_size;
381  }
382 
383 
384 retry:
385 
386  if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
388  }else
389  init_get_bits(&s->gb, buf, buf_size*8);
391 
392  if (!s->context_initialized) {
393  if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
394  return -1;
395  }
396 
397  /* We need to set current_picture_ptr before reading the header,
398  * otherwise we cannot store anyting in there */
399  if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
400  int i= ff_find_unused_picture(s, 0);
401  if (i < 0)
402  return i;
403  s->current_picture_ptr= &s->picture[i];
404  }
405 
406  /* let's go :-) */
407  if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
409  } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
411  } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
412  if(s->avctx->extradata_size && s->picture_number==0){
413  GetBitContext gb;
414 
416  ret = ff_mpeg4_decode_picture_header(s, &gb);
417  }
418  ret = ff_mpeg4_decode_picture_header(s, &s->gb);
419  } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
421  } else if (CONFIG_FLV_DECODER && s->h263_flv) {
423  } else {
425  }
426 
427  if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
428 
429  /* skip if the header was thrashed */
430  if (ret < 0){
431  av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
432  return -1;
433  } else if ((s->width != avctx->coded_width ||
434  s->height != avctx->coded_height ||
435  (s->width + 15) >> 4 != s->mb_width ||
436  (s->height + 15) >> 4 != s->mb_height) &&
438  av_log_missing_feature(s->avctx, "Width/height/bit depth/chroma idc changing with threads is", 0);
439  return AVERROR_PATCHWELCOME; // width / height changed during parallelized decoding
440  }
441 
442  avctx->has_b_frames= !s->low_delay;
443 
444  if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
445  if(s->stream_codec_tag == AV_RL32("XVID") ||
446  s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
447  s->codec_tag == AV_RL32("RMP4") ||
448  s->codec_tag == AV_RL32("SIPP")
449  )
450  s->xvid_build= 0;
451 #if 0
452  if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
453  && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
454  s->xvid_build= 0;
455 #endif
456  }
457 
458  if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
459  if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
460  s->divx_version= 400; //divx 4
461  }
462 
463  if(s->xvid_build>=0 && s->divx_version>=0){
464  s->divx_version=
465  s->divx_build= -1;
466  }
467 
469  if(s->codec_tag == AV_RL32("XVIX"))
471 
472  if(s->codec_tag == AV_RL32("UMP4")){
474  }
475 
476  if(s->divx_version>=500 && s->divx_build<1814){
478  }
479 
480  if(s->divx_version>502 && s->divx_build<1814){
482  }
483 
484  if(s->xvid_build<=3U)
485  s->padding_bug_score= 256*256*256*64;
486 
487  if(s->xvid_build<=1U)
489 
490  if(s->xvid_build<=12U)
492 
493  if(s->xvid_build<=32U)
495 
496 #define SET_QPEL_FUNC(postfix1, postfix2) \
497  s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
498  s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
499  s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
500 
501  if(s->lavc_build<4653U)
503 
504  if(s->lavc_build<4655U)
506 
507  if(s->lavc_build<4670U){
509  }
510 
511  if(s->lavc_build<=4712U)
513 
514  if(s->divx_version>=0)
516 //printf("padding_bug_score: %d\n", s->padding_bug_score);
517  if(s->divx_version==501 && s->divx_build==20020416)
518  s->padding_bug_score= 256*256*256*64;
519 
520  if(s->divx_version<500U){
522  }
523 
524  if(s->divx_version>=0)
526 #if 0
527  if(s->divx_version==500)
528  s->padding_bug_score= 256*256*256*64;
529 
530  /* very ugly XVID padding bug detection FIXME/XXX solve this differently
531  * Let us hope this at least works.
532  */
533  if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
534  && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
536 
537  if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
539 #endif
540  }
541 
543  SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
544  SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
545  SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
546  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
547  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
548  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
549 
550  SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
551  SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
552  SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
553  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
554  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
555  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
556  }
557 
558  if(avctx->debug & FF_DEBUG_BUGS)
559  av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
561  s->divx_packed ? "p" : "");
562 
563 #if HAVE_MMX
564  if (s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
565  avctx->idct_algo= FF_IDCT_XVIDMMX;
567  s->picture_number=0;
568  }
569 #endif
570 
571  /* After H263 & mpeg4 header decode we have the height, width,*/
572  /* and other parameters. So then we could init the picture */
573  /* FIXME: By the way H263 decoder is evolving it should have */
574  /* an H263EncContext */
575 
576  if ( s->width != avctx->coded_width
577  || s->height != avctx->coded_height) {
578  /* H.263 could change picture size any time */
579  ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
580 
582  av_log_missing_feature(s->avctx, "Width/height/bit depth/chroma idc changing with threads is", 0);
583  return -1; // width / height changed during parallelized decoding
584  }
585 
586  s->parse_context.buffer=0;
587  MPV_common_end(s);
588  s->parse_context= pc;
589  }
590  if (!s->context_initialized) {
591  avcodec_set_dimensions(avctx, s->width, s->height);
592 
593  goto retry;
594  }
595 
598 
599  // for skipping the frame
602 
603  /* skip B-frames if we don't have reference frames */
604  if(s->last_picture_ptr==NULL && (s->pict_type==AV_PICTURE_TYPE_B || s->dropable)) return get_consumed_bytes(s, buf_size);
607  || avctx->skip_frame >= AVDISCARD_ALL)
608  return get_consumed_bytes(s, buf_size);
609 
610  if(s->next_p_frame_damaged){
612  return get_consumed_bytes(s, buf_size);
613  else
615  }
616 
620  }else if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
623  }else{
626  }
627 
628  if(MPV_frame_start(s, avctx) < 0)
629  return -1;
630 
631  if (!s->divx_packed) ff_thread_finish_setup(avctx);
632 
635  goto frame_end;
636  }
637 
638  if (avctx->hwaccel) {
639  if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
640  return -1;
641  }
642 
644 
645  //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
646  //which is not available before MPV_frame_start()
647  if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
649  if(ret<0) return ret;
650  if(ret==1) goto intrax8_decoded;
651  }
652 
653  /* decode each macroblock */
654  s->mb_x=0;
655  s->mb_y=0;
656 
657  ret = decode_slice(s);
658  while(s->mb_y<s->mb_height){
659  if(s->msmpeg4_version){
660  if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
661  break;
662  }else{
663  int prev_x=s->mb_x, prev_y=s->mb_y;
664  if(ff_h263_resync(s)<0)
665  break;
666  if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
667  s->error_occurred = 1;
668  }
669 
670  if(s->msmpeg4_version<4 && s->h263_pred)
672 
673  if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
674  }
675 
677  if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
679  }
680 
681  assert(s->bitstream_buffer_size==0);
682 frame_end:
683  /* divx 5.01+ bistream reorder stuff */
684  if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
685  int current_pos= get_bits_count(&s->gb)>>3;
686  int startcode_found=0;
687 
688  if(buf_size - current_pos > 5){
689  int i;
690  for(i=current_pos; i<buf_size-3; i++){
691  if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
692  startcode_found=1;
693  break;
694  }
695  }
696  }
697  if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style
698  startcode_found=1;
699  current_pos=0;
700  }
701 
702  if(startcode_found){
704  &s->bitstream_buffer,
706  buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
707  if (!s->bitstream_buffer)
708  return AVERROR(ENOMEM);
709  memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
710  s->bitstream_buffer_size= buf_size - current_pos;
711  }
712  }
713 
714 intrax8_decoded:
715  ff_er_frame_end(s);
716 
717  if (avctx->hwaccel) {
718  if (avctx->hwaccel->end_frame(avctx) < 0)
719  return -1;
720  }
721 
722  MPV_frame_end(s);
723 
725  assert(s->current_picture.f.pict_type == s->pict_type);
726  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
727  *pict= *(AVFrame*)s->current_picture_ptr;
728  } else if (s->last_picture_ptr != NULL) {
729  *pict= *(AVFrame*)s->last_picture_ptr;
730  }
731 
732  if(s->last_picture_ptr || s->low_delay){
733  *data_size = sizeof(AVFrame);
734  ff_print_debug_info(s, pict);
735  }
736 
737 #ifdef PRINT_FRAME_TIME
738 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
739 #endif
740 
741  return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
742 }
743 
745  .name = "h263",
746  .type = AVMEDIA_TYPE_VIDEO,
747  .id = CODEC_ID_H263,
748  .priv_data_size = sizeof(MpegEncContext),
754  .max_lowres= 3,
755  .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
756  .pix_fmts= ff_hwaccel_pixfmt_list_420,
757 };