FFmpeg  2.1.1
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 FFmpeg.
7  *
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.
12  *
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.
17  *
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
21  */
22 
23 /**
24  * @file
25  * H.263 decoder.
26  */
27 
28 #define UNCHECKED_BITSTREAM_READER 1
29 
30 #include "libavutil/cpu.h"
31 #include "avcodec.h"
32 #include "error_resilience.h"
33 #include "flv.h"
34 #include "h263.h"
35 #include "h263_parser.h"
36 #include "internal.h"
37 #include "mpeg4video.h"
38 #include "mpeg4video_parser.h"
39 #include "mpegvideo.h"
40 #include "msmpeg4.h"
41 #include "vdpau_internal.h"
42 #include "thread.h"
43 
45 {
46  MpegEncContext *s = avctx->priv_data;
47  int ret;
48 
49  s->avctx = avctx;
50  s->out_format = FMT_H263;
51  s->width = avctx->coded_width;
52  s->height = avctx->coded_height;
53  s->workaround_bugs = avctx->workaround_bugs;
54 
55  // set defaults
57  s->quant_precision = 5;
59  s->low_delay = 1;
60  if (avctx->codec->id == AV_CODEC_ID_MSS2)
61  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
62  else
63  avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
64  s->unrestricted_mv = 1;
65 
66  /* select sub codec */
67  switch (avctx->codec->id) {
68  case AV_CODEC_ID_H263:
69  case AV_CODEC_ID_H263P:
70  s->unrestricted_mv = 0;
72  break;
73  case AV_CODEC_ID_MPEG4:
74  break;
76  s->h263_pred = 1;
77  s->msmpeg4_version = 1;
78  break;
80  s->h263_pred = 1;
81  s->msmpeg4_version = 2;
82  break;
84  s->h263_pred = 1;
85  s->msmpeg4_version = 3;
86  break;
87  case AV_CODEC_ID_WMV1:
88  s->h263_pred = 1;
89  s->msmpeg4_version = 4;
90  break;
91  case AV_CODEC_ID_WMV2:
92  s->h263_pred = 1;
93  s->msmpeg4_version = 5;
94  break;
95  case AV_CODEC_ID_VC1:
96  case AV_CODEC_ID_WMV3:
99  case AV_CODEC_ID_MSS2:
100  s->h263_pred = 1;
101  s->msmpeg4_version = 6;
103  break;
104  case AV_CODEC_ID_H263I:
105  break;
106  case AV_CODEC_ID_FLV1:
107  s->h263_flv = 1;
108  break;
109  default:
110  return AVERROR(EINVAL);
111  }
112  s->codec_id = avctx->codec->id;
113  avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
114 
115  if (avctx->stream_codec_tag == AV_RL32("l263") && avctx->extradata_size == 56 && avctx->extradata[0] == 1)
116  s->ehc_mode = 1;
117 
118  /* for h263, we allocate the images after having read the header */
119  if (avctx->codec->id != AV_CODEC_ID_H263 &&
120  avctx->codec->id != AV_CODEC_ID_H263P &&
121  avctx->codec->id != AV_CODEC_ID_MPEG4)
122  if ((ret = ff_MPV_common_init(s)) < 0)
123  return ret;
124 
126 
127  return 0;
128 }
129 
131 {
132  MpegEncContext *s = avctx->priv_data;
133 
135  return 0;
136 }
137 
138 /**
139  * Return the number of bytes consumed for building the current frame.
140  */
141 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
142 {
143  int pos = (get_bits_count(&s->gb) + 7) >> 3;
144 
145  if (s->divx_packed || s->avctx->hwaccel) {
146  /* We would have to scan through the whole buf to handle the weird
147  * reordering ... */
148  return buf_size;
149  } else if (s->flags & CODEC_FLAG_TRUNCATED) {
150  pos -= s->parse_context.last_index;
151  // padding is not really read so this might be -1
152  if (pos < 0)
153  pos = 0;
154  return pos;
155  } else {
156  // avoid infinite loops (maybe not needed...)
157  if (pos == 0)
158  pos = 1;
159  // oops ;)
160  if (pos + 10 > buf_size)
161  pos = buf_size;
162 
163  return pos;
164  }
165 }
166 
168 {
169  const int part_mask = s->partitioned_frame ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
170  const int mb_size = 16 >> s->avctx->lowres;
171  int ret;
172 
173  s->last_resync_gb = s->gb;
174  s->first_slice_line = 1;
175  s->resync_mb_x = s->mb_x;
176  s->resync_mb_y = s->mb_y;
177 
178  ff_set_qscale(s, s->qscale);
179 
180  if (s->avctx->hwaccel) {
181  const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
182  ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
183  // ensure we exit decode loop
184  s->mb_y = s->mb_height;
185  return ret;
186  }
187 
188  if (s->partitioned_frame) {
189  const int qscale = s->qscale;
190 
192  if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
193  return ret;
194 
195  /* restore variables which were modified */
196  s->first_slice_line = 1;
197  s->mb_x = s->resync_mb_x;
198  s->mb_y = s->resync_mb_y;
199  ff_set_qscale(s, qscale);
200  }
201 
202  for (; s->mb_y < s->mb_height; s->mb_y++) {
203  /* per-row end of slice checks */
204  if (s->msmpeg4_version) {
205  if (s->resync_mb_y + s->slice_height == s->mb_y) {
207  s->mb_x - 1, s->mb_y, ER_MB_END);
208 
209  return 0;
210  }
211  }
212 
213  if (s->msmpeg4_version == 1) {
214  s->last_dc[0] =
215  s->last_dc[1] =
216  s->last_dc[2] = 128;
217  }
218 
220  for (; s->mb_x < s->mb_width; s->mb_x++) {
221  int ret;
222 
224 
225  if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
226  s->first_slice_line = 0;
227 
228  /* DCT & quantize */
229 
230  s->mv_dir = MV_DIR_FORWARD;
231  s->mv_type = MV_TYPE_16X16;
232 // s->mb_skipped = 0;
233  av_dlog(s, "%d %d %06X\n",
234  ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
235  ret = s->decode_mb(s, s->block);
236 
237  if (s->pict_type != AV_PICTURE_TYPE_B)
239 
240  if (ret < 0) {
241  const int xy = s->mb_x + s->mb_y * s->mb_stride;
242  if (ret == SLICE_END) {
243  ff_MPV_decode_mb(s, s->block);
244  if (s->loop_filter)
246 
248  s->mb_x, s->mb_y, ER_MB_END & part_mask);
249 
250  s->padding_bug_score--;
251 
252  if (++s->mb_x >= s->mb_width) {
253  s->mb_x = 0;
254  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
256  s->mb_y++;
257  }
258  return 0;
259  } else if (ret == SLICE_NOEND) {
261  "Slice mismatch at MB: %d\n", xy);
263  s->mb_x + 1, s->mb_y,
264  ER_MB_END & part_mask);
265  return AVERROR_INVALIDDATA;
266  }
267  av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
269  s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
270 
271  return AVERROR_INVALIDDATA;
272  }
273 
274  ff_MPV_decode_mb(s, s->block);
275  if (s->loop_filter)
277  }
278 
279  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
281 
282  s->mb_x = 0;
283  }
284 
285  av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
286 
287  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
289  get_bits_left(&s->gb) >= 48 &&
290  show_bits(&s->gb, 24) == 0x4010 &&
291  !s->data_partitioning)
292  s->padding_bug_score += 32;
293 
294  /* try to detect the padding bug */
295  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
297  get_bits_left(&s->gb) >= 0 &&
298  get_bits_left(&s->gb) < 137 &&
299  // !s->resync_marker &&
300  !s->data_partitioning) {
301  const int bits_count = get_bits_count(&s->gb);
302  const int bits_left = s->gb.size_in_bits - bits_count;
303 
304  if (bits_left == 0) {
305  s->padding_bug_score += 16;
306  } else if (bits_left != 1) {
307  int v = show_bits(&s->gb, 8);
308  v |= 0x7F >> (7 - (bits_count & 7));
309 
310  if (v == 0x7F && bits_left <= 8)
311  s->padding_bug_score--;
312  else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
313  bits_left <= 16)
314  s->padding_bug_score += 4;
315  else
316  s->padding_bug_score++;
317  }
318  }
319 
321  if (s->padding_bug_score > -2 && !s->data_partitioning
322  /* && (s->divx_version >= 0 || !s->resync_marker) */)
324  else
326  }
327 
328  // handle formats which don't have unique end markers
329  if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
330  int left = get_bits_left(&s->gb);
331  int max_extra = 7;
332 
333  /* no markers in M$ crap */
335  max_extra += 17;
336 
337  /* buggy padding but the frame should still end approximately at
338  * the bitstream end */
339  if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
341  max_extra += 48;
342  else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
343  max_extra += 256 * 256 * 256 * 64;
344 
345  if (left > max_extra)
347  "discarding %d junk bits at end, next would be %X\n",
348  left, show_bits(&s->gb, 24));
349  else if (left < 0)
350  av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
351  else
353  s->mb_x - 1, s->mb_y, ER_MB_END);
354 
355  return 0;
356  }
357 
359  "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
360  get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
361 
362  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
363  ER_MB_END & part_mask);
364 
365  return AVERROR_INVALIDDATA;
366 }
367 
368 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
369  AVPacket *avpkt)
370 {
371  const uint8_t *buf = avpkt->data;
372  int buf_size = avpkt->size;
373  MpegEncContext *s = avctx->priv_data;
374  int ret;
375  AVFrame *pict = data;
376 
377  s->flags = avctx->flags;
378  s->flags2 = avctx->flags2;
379 
380  /* no supplementary picture */
381  if (buf_size == 0) {
382  /* special case for last picture */
383  if (s->low_delay == 0 && s->next_picture_ptr) {
384  if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
385  return ret;
386  s->next_picture_ptr = NULL;
387 
388  *got_frame = 1;
389  }
390 
391  return 0;
392  }
393 
394  if (s->flags & CODEC_FLAG_TRUNCATED) {
395  int next;
396 
398  next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
399  } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
400  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
401  } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
402  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
403  } else {
405  "this codec does not support truncated bitstreams\n");
406  return AVERROR(EINVAL);
407  }
408 
409  if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
410  &buf_size) < 0)
411  return buf_size;
412  }
413 
414 retry:
415  if (s->divx_packed && s->bitstream_buffer_size) {
416  int i;
417  for(i=0; i < buf_size-3; i++) {
418  if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
419  if (buf[i+3]==0xB0) {
420  av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
421  s->bitstream_buffer_size = 0;
422  }
423  break;
424  }
425  }
426  }
427 
428  if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder
430  else
431  ret = init_get_bits8(&s->gb, buf, buf_size);
432 
433  s->bitstream_buffer_size = 0;
434  if (ret < 0)
435  return ret;
436 
437  if (!s->context_initialized)
438  if ((ret = ff_MPV_common_init(s)) < 0) // we need the idct permutaton for reading a custom matrix
439  return ret;
440 
441  /* We need to set current_picture_ptr before reading the header,
442  * otherwise we cannot store anyting in there */
443  if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
444  int i = ff_find_unused_picture(s, 0);
445  if (i < 0)
446  return i;
447  s->current_picture_ptr = &s->picture[i];
448  }
449 
450  /* let's go :-) */
451  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
453  } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
455  } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
456  if (s->avctx->extradata_size && s->picture_number == 0) {
457  GetBitContext gb;
458 
459  if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
460  ret = ff_mpeg4_decode_picture_header(s, &gb);
461  }
462  ret = ff_mpeg4_decode_picture_header(s, &s->gb);
463  } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
465  } else if (CONFIG_FLV_DECODER && s->h263_flv) {
467  } else {
469  }
470 
471  if (ret < 0 || ret == FRAME_SKIPPED) {
472  if ( s->width != avctx->coded_width
473  || s->height != avctx->coded_height) {
474  av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
475  s->width = avctx->coded_width;
476  s->height= avctx->coded_height;
477  }
478  }
479  if (ret == FRAME_SKIPPED)
480  return get_consumed_bytes(s, buf_size);
481 
482  /* skip if the header was thrashed */
483  if (ret < 0) {
484  av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
485  return ret;
486  }
487 
488  avctx->has_b_frames = !s->low_delay;
489 
490  if (s->xvid_build == -1 && s->divx_version == -1 && s->lavc_build == -1) {
491  if (s->stream_codec_tag == AV_RL32("XVID") ||
492  s->codec_tag == AV_RL32("XVID") ||
493  s->codec_tag == AV_RL32("XVIX") ||
494  s->codec_tag == AV_RL32("RMP4") ||
495  s->codec_tag == AV_RL32("ZMP4") ||
496  s->codec_tag == AV_RL32("SIPP"))
497  s->xvid_build = 0;
498 #if 0
499  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
500  s->vol_control_parameters == 1 &&
501  s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
502  s->xvid_build = 0;
503 #endif
504  }
505 
506  if (s->xvid_build == -1 && s->divx_version == -1 && s->lavc_build == -1)
507  if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
508  s->vol_control_parameters == 0)
509  s->divx_version = 400; // divx 4
510 
511  if (s->xvid_build >= 0 && s->divx_version >= 0) {
512  s->divx_version =
513  s->divx_build = -1;
514  }
515 
517  if (s->codec_tag == AV_RL32("XVIX"))
519 
520  if (s->codec_tag == AV_RL32("UMP4"))
522 
523  if (s->divx_version >= 500 && s->divx_build < 1814)
525 
526  if (s->divx_version > 502 && s->divx_build < 1814)
528 
529  if (s->xvid_build <= 3U)
530  s->padding_bug_score = 256 * 256 * 256 * 64;
531 
532  if (s->xvid_build <= 1U)
534 
535  if (s->xvid_build <= 12U)
537 
538  if (s->xvid_build <= 32U)
540 
541 #define SET_QPEL_FUNC(postfix1, postfix2) \
542  s->dsp.put_ ## postfix1 = ff_put_ ## postfix2; \
543  s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
544  s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
545 
546  if (s->lavc_build < 4653U)
548 
549  if (s->lavc_build < 4655U)
551 
552  if (s->lavc_build < 4670U)
554 
555  if (s->lavc_build <= 4712U)
557 
558  if (s->divx_version >= 0)
560  if (s->divx_version == 501 && s->divx_build == 20020416)
561  s->padding_bug_score = 256 * 256 * 256 * 64;
562 
563  if (s->divx_version < 500U)
565 
566  if (s->divx_version >= 0)
568 #if 0
569  if (s->divx_version == 500)
570  s->padding_bug_score = 256 * 256 * 256 * 64;
571 
572  /* very ugly XVID padding bug detection FIXME/XXX solve this differently
573  * Let us hope this at least works. */
574  if (s->resync_marker == 0 && s->data_partitioning == 0 &&
575  s->divx_version == -1 && s->codec_id == AV_CODEC_ID_MPEG4 &&
576  s->vo_type == 0)
578 
579  // FIXME not sure about the version num but a 4609 file seems ok
580  if (s->lavc_build < 4609U)
582 #endif
583  }
584 
585  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
586  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
587  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
588  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
589  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
590  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
591  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
592 
593  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
594  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
595  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
596  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
597  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
598  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
599  }
600 
601  if (avctx->debug & FF_DEBUG_BUGS)
603  "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
605  s->divx_version, s->divx_build, s->divx_packed ? "p" : "");
606 
607 #if HAVE_MMX
608  if (s->codec_id == AV_CODEC_ID_MPEG4 && s->xvid_build >= 0 &&
609  avctx->idct_algo == FF_IDCT_AUTO &&
611  avctx->idct_algo = FF_IDCT_XVIDMMX;
613  goto retry;
614  }
615 #endif
616 
617  /* After H263 & mpeg4 header decode we have the height, width,
618  * and other parameters. So then we could init the picture.
619  * FIXME: By the way H263 decoder is evolving it should have
620  * an H263EncContext */
621  if (s->width != avctx->coded_width ||
622  s->height != avctx->coded_height ||
623  s->context_reinit) {
624  /* H.263 could change picture size any time */
625  s->context_reinit = 0;
626 
627  avcodec_set_dimensions(avctx, s->width, s->height);
628 
629  if ((ret = ff_MPV_common_frame_size_change(s)))
630  return ret;
631  }
632 
633  if (s->codec_id == AV_CODEC_ID_H263 ||
634  s->codec_id == AV_CODEC_ID_H263P ||
637 
638  // for skipping the frame
641 
642  /* skip B-frames if we don't have reference frames */
643  if (s->last_picture_ptr == NULL &&
644  (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
645  return get_consumed_bytes(s, buf_size);
646  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
647  s->pict_type == AV_PICTURE_TYPE_B) ||
648  (avctx->skip_frame >= AVDISCARD_NONKEY &&
649  s->pict_type != AV_PICTURE_TYPE_I) ||
650  avctx->skip_frame >= AVDISCARD_ALL)
651  return get_consumed_bytes(s, buf_size);
652 
653  if (s->next_p_frame_damaged) {
654  if (s->pict_type == AV_PICTURE_TYPE_B)
655  return get_consumed_bytes(s, buf_size);
656  else
657  s->next_p_frame_damaged = 0;
658  }
659 
660  if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
663  } else {
666  }
667 
668  if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
669  return ret;
670 
671  if (!s->divx_packed && !avctx->hwaccel)
672  ff_thread_finish_setup(avctx);
673 
676  goto frame_end;
677  }
678 
679  if (avctx->hwaccel)
680  if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
681  s->gb.buffer_end - s->gb.buffer)) < 0)
682  return ret;
683 
685 
686  /* the second part of the wmv2 header contains the MB skip bits which
687  * are stored in current_picture->mb_type which is not available before
688  * ff_MPV_frame_start() */
689  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
691  if (ret < 0)
692  return ret;
693  if (ret == 1)
694  goto frame_end;
695  }
696 
697  /* decode each macroblock */
698  s->mb_x = 0;
699  s->mb_y = 0;
700 
701  ret = decode_slice(s);
702  while (s->mb_y < s->mb_height) {
703  if (s->msmpeg4_version) {
704  if (s->slice_height == 0 || s->mb_x != 0 ||
705  (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
706  break;
707  } else {
708  int prev_x = s->mb_x, prev_y = s->mb_y;
709  if (ff_h263_resync(s) < 0)
710  break;
711  if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
712  s->er.error_occurred = 1;
713  }
714 
715  if (s->msmpeg4_version < 4 && s->h263_pred)
717 
718  if (decode_slice(s) < 0)
719  ret = AVERROR_INVALIDDATA;
720  }
721 
722  if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
724  if (!CONFIG_MSMPEG4_DECODER ||
725  ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
727 
729 frame_end:
730  ff_er_frame_end(&s->er);
731 
732  if (avctx->hwaccel)
733  if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
734  return ret;
735 
736  ff_MPV_frame_end(s);
737 
738  /* divx 5.01+ bitstream reorder stuff */
739  /* Since this clobbers the input buffer and hwaccel codecs still need the
740  * data during hwaccel->end_frame we should not do this any earlier */
741  if (s->codec_id == AV_CODEC_ID_MPEG4 && s->divx_packed) {
742  int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
743  int startcode_found = 0;
744 
745  if (buf_size - current_pos > 7) {
746  int i;
747  for (i = current_pos; i < buf_size - 4; i++)
748  if (buf[i] == 0 &&
749  buf[i + 1] == 0 &&
750  buf[i + 2] == 1 &&
751  buf[i + 3] == 0xB6) {
752  startcode_found = !(buf[i + 4] & 0x40);
753  break;
754  }
755  }
756 
757  if (startcode_found) {
760  buf_size - current_pos +
762  if (!s->bitstream_buffer)
763  return AVERROR(ENOMEM);
764  memcpy(s->bitstream_buffer, buf + current_pos,
765  buf_size - current_pos);
766  s->bitstream_buffer_size = buf_size - current_pos;
767  }
768  }
769 
770  if (!s->divx_packed && avctx->hwaccel)
771  ff_thread_finish_setup(avctx);
772 
775  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
776  if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
777  return ret;
780  } else if (s->last_picture_ptr != NULL) {
781  if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
782  return ret;
785  }
786 
787  if (s->last_picture_ptr || s->low_delay) {
788  if ( pict->format == AV_PIX_FMT_YUV420P
789  && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
790  int x, y, p;
792  for (p=0; p<3; p++) {
793  int w = FF_CEIL_RSHIFT(pict-> width, !!p);
794  int h = FF_CEIL_RSHIFT(pict->height, !!p);
795  int linesize = pict->linesize[p];
796  for (y=0; y<(h>>1); y++)
797  for (x=0; x<w; x++)
798  FFSWAP(int,
799  pict->data[p][x + y*linesize],
800  pict->data[p][x + (h-1-y)*linesize]);
801  }
802  }
803  *got_frame = 1;
804  }
805 
806  if (ret && (avctx->err_recognition & AV_EF_EXPLODE))
807  return ret;
808  else
809  return get_consumed_bytes(s, buf_size);
810 }
811 
813 #if CONFIG_VAAPI
815 #endif
816 #if CONFIG_VDPAU
818 #endif
821 };
822 
824  .name = "h263",
825  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
826  .type = AVMEDIA_TYPE_VIDEO,
827  .id = AV_CODEC_ID_H263,
828  .priv_data_size = sizeof(MpegEncContext),
832  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
834  .flush = ff_mpeg_flush,
835  .max_lowres = 3,
837 };
838 
840  .name = "h263p",
841  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
842  .type = AVMEDIA_TYPE_VIDEO,
843  .id = AV_CODEC_ID_H263P,
844  .priv_data_size = sizeof(MpegEncContext),
848  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
850  .flush = ff_mpeg_flush,
851  .max_lowres = 3,
853 };
int bitstream_buffer_size
Definition: mpegvideo.h:616
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2392
discard all frames except keyframes
Definition: avcodec.h:617
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:3018
unsigned int stream_codec_tag
fourcc from the AVI stream header (LSB first, so &quot;ABCD&quot; -&gt; (&#39;D&#39;&lt;&lt;24) + (&#39;C&#39;&lt;&lt;16) + (&#39;B&#39;&lt;&lt;8) + ...
Definition: avcodec.h:1180
int(* start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Called at the beginning of each frame or field picture.
Definition: avcodec.h:3072
float v
int picture_number
Definition: mpegvideo.h:279
const char * s
Definition: avisynth_c.h:668
This structure describes decoded (raw) audio or video data.
Definition: frame.h:96
int vol_control_parameters
does the stream contain the low_delay flag, used to workaround buggy encoders
Definition: mpegvideo.h:599
mpeg2/4, h264 default
Definition: avcodec.h:648
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1324
av_cold int ff_dct_common_init(MpegEncContext *s)
Definition: mpegvideo.c:155
av_cold int ff_MPV_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:1003
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:711
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: avcodec.h:4153
#define ER_MB_END
void ff_MPV_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:3331
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static int decode_slice(MpegEncContext *s)
Definition: h263dec.c:167
#define CODEC_CAP_TRUNCATED
Definition: avcodec.h:743
void ff_er_frame_end(ERContext *s)
int msmpeg4_version
0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
Definition: mpegvideo.h:644
void avcodec_set_dimensions(AVCodecContext *s, int width, int height)
Definition: utils.c:233
int size
Definition: avcodec.h:1064
uint8_t * bitstream_buffer
Definition: mpegvideo.h:615
enum AVCodecID codec_id
Definition: mpegvideo.h:261
const uint8_t * buffer
Definition: get_bits.h:55
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1342
mpegvideo header.
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
discard all
Definition: avcodec.h:618
int padding_bug_score
used to detect the VERY common padding bug in MPEG4
Definition: mpegvideo.h:606
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:286
Pixel format.
Definition: avcodec.h:4533
AVCodec.
Definition: avcodec.h:2922
#define av_cold
Definition: avcodec.h:653
int qscale
QP.
Definition: mpegvideo.h:373
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1254
int quant_precision
Definition: mpegvideo.h:583
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:604
#define FF_BUG_UMP4
Definition: avcodec.h:2395
#define FF_QSCALE_TYPE_MPEG1
Definition: avcodec.h:890
int ff_mpeg4_decode_partitions(MpegEncContext *s)
Decode the first and second partition.
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:2778
void ff_mpeg4_clean_buffers(MpegEncContext *s)
Definition: mpeg4video.c:43
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: utils.c:153
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo.c:3009
int context_reinit
Definition: mpegvideo.h:745
int ff_MPV_common_frame_size_change(MpegEncContext *s)
Definition: mpegvideo.c:1183
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:102
uint8_t
enum OutputFormat out_format
output format
Definition: mpegvideo.h:253
Multithreading support functions.
#define CODEC_CAP_HWACCEL_VDPAU
Codec can export data for HW decoding (VDPAU).
Definition: avcodec.h:779
#define ER_MB_ERROR
qpel_mc_func(* qpel_put)[16]
Definition: mpegvideo.h:232
const char * name
Name of the codec implementation.
Definition: avcodec.h:2929
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:443
#define FF_DEBUG_BUGS
Definition: avcodec.h:2455
int resync_marker
could this stream contain resync markers
Definition: mpegvideo.h:596
int av_frame_ref(AVFrame *dst, AVFrame *src)
Setup a new reference to the data described by a given frame.
Definition: frame.c:247
int ff_intel_h263_decode_picture_header(MpegEncContext *s)
Definition: intelh263dec.c:25
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:347
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:533
#define FF_CEIL_RSHIFT(a, b)
Definition: avcodec.h:916
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:742
mpeg1, jpeg, h263
Definition: avcodec.h:649
const char data[16]
Definition: mxf.c:68
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:207
int flags2
AVCodecContext.flags2.
Definition: mpegvideo.h:265
int mb_height
number of MBs horizontally &amp; vertically
Definition: mpegvideo.h:281
int lowres
low resolution decoding, 1-&gt; 1/2 size, 2-&gt;1/4 size
Definition: avcodec.h:2580
#define CONFIG_H263I_DECODER
Definition: config.h:524
void ff_MPV_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1734
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:271
#define FFSWAP(type, a, b)
Definition: avcodec.h:928
int ff_wmv2_decode_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:113
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1855
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:52
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:866
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: dsputil.h:186
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:3317
#define CONFIG_H263P_DECODER
Definition: config.h:525
#define U(x)
Definition: vp56_arith.h:37
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:583
enum AVCodecID id
Definition: avcodec.h:2936
#define CODEC_FLAG_TRUNCATED
Definition: avcodec.h:708
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1427
int stream_codec_tag
internal stream_codec_tag upper case converted from avctx stream_codec_tag
Definition: mpegvideo.h:272
int last_dc[3]
last DC values for MPEG1
Definition: mpegvideo.h:352
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
#define CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:769
int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
Combine the (truncated) bitstream to a complete frame.
Definition: parser.c:216
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:594
qpel_mc_func avg_qpel_pixels_tab[2][16]
Definition: dsputil.h:187
AVCodec ff_h263_decoder
Definition: h263dec.c:823
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:392
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
ERContext er
Definition: mpegvideo.h:747
int capabilities
Codec capabilities.
Definition: avcodec.h:2941
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: avcodec.h:4168
struct AVCodec * codec
Definition: avcodec.h:1155
int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:133
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1234
#define AV_EF_BUFFER
detect improper bitstream length
Definition: avcodec.h:2479
int low_delay
no reordering needed / has no b-frames
Definition: mpegvideo.h:597
GetBitContext gb
Definition: mpegvideo.h:654
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:707
Libavcodec external API header.
AVPixelFormat
Pixel format.
Definition: pixfmt.h:66
int ff_flv_decode_picture_header(MpegEncContext *s)
Definition: flvdec.c:36
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:3079
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:531
uint8_t * error_status_table
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:44
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:580
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
Definition: frame.c:399
#define ER_AC_ERROR
void ff_h263_loop_filter(MpegEncContext *s)
Definition: h263.c:138
int err_recognition
Definition: mpegvideo.h:536
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:368
int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type)
Definition: mpegvideo.c:2179
void ff_mpeg_er_frame_start(MpegEncContext *s)
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:167
#define CONFIG_MPEG4_DECODER
Definition: config.h:556
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2476
#define CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:736
int ff_h263_get_gob_height(MpegEncContext *s)
Get the GOB height based on picture height.
Definition: h263.c:374
static int get_consumed_bytes(MpegEncContext *s, int buf_size)
Return the number of bytes consumed for building the current frame.
Definition: h263dec.c:141
int last_index
Definition: parser.h:31
float y
int next_p_frame_damaged
set if the next p frame is damaged, to avoid showing trashed b frames
Definition: mpegvideo.h:535
#define FF_IDCT_AUTO
Definition: avcodec.h:2541
ret
Definition: avfilter.c:961
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2540
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:351
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:812
unsigned int allocated_bitstream_buffer_size
Definition: mpegvideo.h:617
int size_in_bits
Definition: get_bits.h:57
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:282
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size)
Definition: msmpeg4dec.c:551
AVCodec ff_h263p_decoder
Definition: h263dec.c:839
MotionEstContext me
Definition: mpegvideo.h:441
#define SET_QPEL_FUNC(postfix1, postfix2)
int ff_MPV_frame_start(MpegEncContext *s, AVCodecContext *avctx)
generic function for encode/decode called after coding/decoding the header and before a frame is code...
Definition: mpegvideo.c:1506
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2484
static void flush(AVCodecContext *avctx)
Definition: aacdec.c:498
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:157
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:425
int first_slice_line
used in mpeg4 too to handle resync markers
Definition: mpegvideo.h:642
planar YUV 4:2:0, 12bpp, (1 Cr &amp; Cb sample per 2x2 Y samples)
Definition: avcodec.h:4534
static int width
Definition: utils.c:158
#define AV_CPU_FLAG_MMX
standard MMX
Definition: cpu.h:29
void ff_h263_update_motion_val(MpegEncContext *s)
Definition: h263.c:45
int h263_flv
use flv h263 header
Definition: mpegvideo.h:259
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2396
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:436
int debug
debug
Definition: avcodec.h:2442
main external API structure.
Definition: avcodec.h:1146
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:538
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2480
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:249
void * buf
Definition: avisynth_c.h:594
void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
Definition: mpegvideo.c:2173
#define SLICE_END
end marker found
Definition: mpegvideo.h:710
Picture * picture
main picture buffer
Definition: mpegvideo.h:289
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:593
int extradata_size
Definition: avcodec.h:1255
#define CONFIG_H263_DECODER
Definition: config.h:523
void ff_MPV_decode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:2920
int coded_height
Definition: avcodec.h:1324
Bi-dir predicted.
Definition: avcodec.h:2306
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
Definition: avcodec.h:1389
uint8_t * data
Definition: avcodec.h:1063
#define CONFIG_MPEG4_VDPAU_DECODER
Definition: config.h:558
int context_initialized
Definition: mpegvideo.h:276
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2405
#define FF_BUG_XVID_ILACE
Definition: avcodec.h:2394
int slice_height
in macroblocks
Definition: mpegvideo.h:641
AVHWAccel * ff_find_hwaccel(enum AVCodecID codec_id, enum AVPixelFormat pix_fmt)
Return the hardware accelerated codec for codec codec_id and pixel format pix_fmt.
Definition: utils.c:3184
#define CONFIG_FLV_DECODER
Definition: config.h:516
DSPContext dsp
pointers for accelerated dsp functions
Definition: mpegvideo.h:395
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:124
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:870
#define MV_DIR_FORWARD
Definition: mpegvideo.h:421
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:381
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:254
void * priv_data
Definition: avcodec.h:1182
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:230
qpel_mc_func(* qpel_avg)[16]
Definition: mpegvideo.h:233
HW decoding through VA API, Picture.data[3] contains a vaapi_render_state struct which contains the b...
Definition: avcodec.h:4594
MpegEncContext.
Definition: mpegvideo.h:245
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:350
struct AVCodecContext * avctx
Definition: mpegvideo.h:247
#define FF_BUG_QPEL_CHROMA
Definition: avcodec.h:2399
#define FF_BUG_EDGE
Definition: avcodec.h:2403
discard all non reference
Definition: avcodec.h:615
common internal api header.
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left &amp; top MBs without sig11 ...
Definition: mpegvideo.h:282
const uint8_t * buffer_end
Definition: get_bits.h:55
Picture * last_picture_ptr
pointer to the previous picture.
Definition: mpegvideo.h:349
int workaround_bugs
Work around bugs in encoders which sometimes cannot be detected automatically.
Definition: avcodec.h:2391
#define FF_BUG_DIRECT_BLOCKSIZE
Definition: avcodec.h:2402
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:2943
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:130
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2400
#define AVERROR_INVALIDDATA
#define AV_RL32(x)
Definition: intreadwrite.h:275
void ff_MPV_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1257
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2501
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:532
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:705
ParseContext parse_context
Definition: mpegvideo.h:538
void ff_vdpau_mpeg4_decode_picture(MpegEncContext *s, const uint8_t *buf, int buf_size)
int key_frame
1 -&gt; keyframe, 0-&gt; not
Definition: frame.h:162
#define CONFIG_WMV2_DECODER
Definition: config.h:653
#define AVERROR(e)
int flags2
CODEC_FLAG2_*.
Definition: avcodec.h:1241
struct AVFrame f
Definition: mpegvideo.h:98
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: avcodec.h:4675
int height
Definition: frame.h:145
int flags
AVCodecContext.flags (HQ, MV4, ...)
Definition: mpegvideo.h:264
#define FF_IDCT_XVIDMMX
Definition: avcodec.h:2550
void INT64 start
Definition: avisynth_c.h:594
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:270
#define FRAME_SKIPPED
return value for header parsers if frame is not coded
Definition: mpegvideo.h:48
qpel_mc_func put_no_rnd_qpel_pixels_tab[2][16]
Definition: dsputil.h:188
static int decode(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: crystalhd.c:868
int ff_mpeg4_decode_picture_header(MpegEncContext *s, GetBitContext *gb)
Decode mpeg4 headers.
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:396
#define ER_AC_END
int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
Find the end of the current frame in the bitstream.
void ff_thread_finish_setup(AVCodecContext *avctx)
If the codec defines update_thread_context(), call this when they are ready for the next thread to st...
Definition: pthread.c:702
#define FF_BUG_QPEL_CHROMA2
Definition: avcodec.h:2401
#define CONFIG_MSMPEG4_DECODER
Definition: msmpeg4.h:59
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:3085
int ff_find_unused_picture(MpegEncContext *s, int shared)
Definition: mpegvideo.c:1466
int ff_h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
Definition: h263_parser.c:30
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:3096
#define FF_BUG_HPEL_CHROMA
Definition: avcodec.h:2404
This structure stores compressed data.
Definition: avcodec.h:1040
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:107
void ff_MPV_decode_defaults(MpegEncContext *s)
Set the given MpegEncContext to defaults for decoding.
Definition: mpegvideo.c:836