Libav
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 "avcodec.h"
30 #include "error_resilience.h"
31 #include "flv.h"
32 #include "h263.h"
33 #include "h263_parser.h"
34 #include "internal.h"
35 #include "mpeg_er.h"
36 #include "mpeg4video.h"
37 #include "mpeg4video_parser.h"
38 #include "mpegutils.h"
39 #include "mpegvideo.h"
40 #include "msmpeg4.h"
41 #include "qpeldsp.h"
42 #include "thread.h"
43 #include "wmv2.h"
44 
46 {
47  if (avctx->codec->id == AV_CODEC_ID_MSS2)
48  return AV_PIX_FMT_YUV420P;
49 
50  return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
51 }
52 
54 {
55  MpegEncContext *s = avctx->priv_data;
56  int ret;
57 
58  s->avctx = avctx;
59  s->out_format = FMT_H263;
60  s->width = avctx->coded_width;
61  s->height = avctx->coded_height;
62  s->workaround_bugs = avctx->workaround_bugs;
63 
64  // set defaults
66  s->quant_precision = 5;
68  s->low_delay = 1;
69  s->unrestricted_mv = 1;
70 
71  /* select sub codec */
72  switch (avctx->codec->id) {
73  case AV_CODEC_ID_H263:
74  s->unrestricted_mv = 0;
76  break;
77  case AV_CODEC_ID_MPEG4:
78  break;
80  s->h263_pred = 1;
81  s->msmpeg4_version = 1;
82  break;
84  s->h263_pred = 1;
85  s->msmpeg4_version = 2;
86  break;
88  s->h263_pred = 1;
89  s->msmpeg4_version = 3;
90  break;
91  case AV_CODEC_ID_WMV1:
92  s->h263_pred = 1;
93  s->msmpeg4_version = 4;
94  break;
95  case AV_CODEC_ID_WMV2:
96  s->h263_pred = 1;
97  s->msmpeg4_version = 5;
98  break;
99  case AV_CODEC_ID_VC1:
100  case AV_CODEC_ID_WMV3:
103  case AV_CODEC_ID_MSS2:
104  s->h263_pred = 1;
105  s->msmpeg4_version = 6;
107  break;
108  case AV_CODEC_ID_H263I:
109  break;
110  case AV_CODEC_ID_FLV1:
111  s->h263_flv = 1;
112  break;
113  default:
114  av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
115  avctx->codec->id);
116  return AVERROR(ENOSYS);
117  }
118  s->codec_id = avctx->codec->id;
119 
120  /* for H.263, we allocate the images after having read the header */
121  if (avctx->codec->id != AV_CODEC_ID_H263 &&
122  avctx->codec->id != AV_CODEC_ID_MPEG4) {
123  avctx->pix_fmt = h263_get_format(avctx);
124  ff_mpv_idct_init(s);
125  if ((ret = ff_mpv_common_init(s)) < 0)
126  return ret;
127  }
128 
130  ff_qpeldsp_init(&s->qdsp);
132 
133  return 0;
134 }
135 
137 {
138  MpegEncContext *s = avctx->priv_data;
139 
141  return 0;
142 }
143 
147 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
148 {
149  int pos = (get_bits_count(&s->gb) + 7) >> 3;
150 
151  if (s->divx_packed || s->avctx->hwaccel) {
152  /* We would have to scan through the whole buf to handle the weird
153  * reordering ... */
154  return buf_size;
155  } else if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
156  pos -= s->parse_context.last_index;
157  // padding is not really read so this might be -1
158  if (pos < 0)
159  pos = 0;
160  return pos;
161  } else {
162  // avoid infinite loops (maybe not needed...)
163  if (pos == 0)
164  pos = 1;
165  // oops ;)
166  if (pos + 10 > buf_size)
167  pos = buf_size;
168 
169  return pos;
170  }
171 }
172 
174 {
175  const int part_mask = s->partitioned_frame
176  ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
177  const int mb_size = 16;
178  int ret;
179 
180  s->last_resync_gb = s->gb;
181  s->first_slice_line = 1;
182  s->resync_mb_x = s->mb_x;
183  s->resync_mb_y = s->mb_y;
184 
185  ff_set_qscale(s, s->qscale);
186 
187  if (s->avctx->hwaccel) {
188  const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
189  const uint8_t *end = ff_h263_find_resync_marker(start + 1,
190  s->gb.buffer_end);
191  skip_bits_long(&s->gb, 8 * (end - start));
192  return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
193  }
194 
195  if (s->partitioned_frame) {
196  const int qscale = s->qscale;
197 
199  if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
200  return ret;
201 
202  /* restore variables which were modified */
203  s->first_slice_line = 1;
204  s->mb_x = s->resync_mb_x;
205  s->mb_y = s->resync_mb_y;
206  ff_set_qscale(s, qscale);
207  }
208 
209  for (; s->mb_y < s->mb_height; s->mb_y++) {
210  /* per-row end of slice checks */
211  if (s->msmpeg4_version) {
212  if (s->resync_mb_y + s->slice_height == s->mb_y) {
214  s->mb_x - 1, s->mb_y, ER_MB_END);
215 
216  return 0;
217  }
218  }
219 
220  if (s->msmpeg4_version == 1) {
221  s->last_dc[0] =
222  s->last_dc[1] =
223  s->last_dc[2] = 128;
224  }
225 
227  for (; s->mb_x < s->mb_width; s->mb_x++) {
228  int ret;
229 
231 
232  if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
233  s->first_slice_line = 0;
234 
235  /* DCT & quantize */
236 
237  s->mv_dir = MV_DIR_FORWARD;
238  s->mv_type = MV_TYPE_16X16;
239  ff_dlog(s, "%d %06X\n",
240  get_bits_count(&s->gb), show_bits(&s->gb, 24));
241  ret = s->decode_mb(s, s->block);
242 
243  if (s->pict_type != AV_PICTURE_TYPE_B)
245 
246  if (ret < 0) {
247  const int xy = s->mb_x + s->mb_y * s->mb_stride;
248  if (ret == SLICE_END) {
249  ff_mpv_decode_mb(s, s->block);
250  if (s->loop_filter)
252 
254  s->mb_x, s->mb_y, ER_MB_END & part_mask);
255 
256  s->padding_bug_score--;
257 
258  if (++s->mb_x >= s->mb_width) {
259  s->mb_x = 0;
260  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
262  s->mb_y++;
263  }
264  return 0;
265  } else if (ret == SLICE_NOEND) {
267  "Slice mismatch at MB: %d\n", xy);
269  s->mb_x + 1, s->mb_y,
270  ER_MB_END & part_mask);
271  return AVERROR_INVALIDDATA;
272  }
273  av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
275  s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
276 
277  return AVERROR_INVALIDDATA;
278  }
279 
280  ff_mpv_decode_mb(s, s->block);
281  if (s->loop_filter)
283  }
284 
285  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
287 
288  s->mb_x = 0;
289  }
290 
291  assert(s->mb_x == 0 && s->mb_y == s->mb_height);
292 
293  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
295  get_bits_left(&s->gb) >= 48 &&
296  show_bits(&s->gb, 24) == 0x4010 &&
297  !s->data_partitioning)
298  s->padding_bug_score += 32;
299 
300  /* try to detect the padding bug */
301  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
303  get_bits_left(&s->gb) >= 0 &&
304  get_bits_left(&s->gb) < 48 &&
305  !s->data_partitioning) {
306  const int bits_count = get_bits_count(&s->gb);
307  const int bits_left = s->gb.size_in_bits - bits_count;
308 
309  if (bits_left == 0) {
310  s->padding_bug_score += 16;
311  } else if (bits_left != 1) {
312  int v = show_bits(&s->gb, 8);
313  v |= 0x7F >> (7 - (bits_count & 7));
314 
315  if (v == 0x7F && bits_left <= 8)
316  s->padding_bug_score--;
317  else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
318  bits_left <= 16)
319  s->padding_bug_score += 4;
320  else
321  s->padding_bug_score++;
322  }
323  }
324 
326  if (s->codec_id == AV_CODEC_ID_H263 ||
327  (s->padding_bug_score > -2 && !s->data_partitioning))
329  else
331  }
332 
333  // handle formats which don't have unique end markers
334  if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
335  int left = get_bits_left(&s->gb);
336  int max_extra = 7;
337 
338  /* no markers in M$ crap */
340  max_extra += 17;
341 
342  /* buggy padding but the frame should still end approximately at
343  * the bitstream end */
344  if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
346  max_extra += 48;
347  else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
348  max_extra += 256 * 256 * 256 * 64;
349 
350  if (left > max_extra)
352  "discarding %d junk bits at end, next would be %X\n",
353  left, show_bits(&s->gb, 24));
354  else if (left < 0)
355  av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
356  else
358  s->mb_x - 1, s->mb_y, ER_MB_END);
359 
360  return 0;
361  }
362 
364  "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
365  get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
366 
367  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
368  ER_MB_END & part_mask);
369 
370  return AVERROR_INVALIDDATA;
371 }
372 
373 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
374  AVPacket *avpkt)
375 {
376  const uint8_t *buf = avpkt->data;
377  int buf_size = avpkt->size;
378  MpegEncContext *s = avctx->priv_data;
379  int ret;
380  AVFrame *pict = data;
381 
382  /* no supplementary picture */
383  if (buf_size == 0) {
384  /* special case for last picture */
385  if (s->low_delay == 0 && s->next_picture_ptr) {
386  if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
387  return ret;
388  s->next_picture_ptr = NULL;
389 
390  *got_frame = 1;
391  }
392 
393  return 0;
394  }
395 
396  if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
397  int next;
398 
400  next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
401  } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
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(ENOSYS);
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  if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder
415  ret = init_get_bits8(&s->gb, s->bitstream_buffer,
417  else
418  ret = init_get_bits8(&s->gb, buf, buf_size);
419  s->bitstream_buffer_size = 0;
420 
421  if (ret < 0)
422  return ret;
423 
424  if (!s->context_initialized)
425  // we need the idct permutation for reading a custom matrix
426  ff_mpv_idct_init(s);
427 
428  /* let's go :-) */
429  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
431  } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
433  } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
434  if (s->avctx->extradata_size && s->picture_number == 0) {
435  GetBitContext gb;
436 
437  ret = init_get_bits8(&gb, s->avctx->extradata,
438  s->avctx->extradata_size);
439  if (ret < 0)
440  return ret;
442  }
443  ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
444  } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
446  } else if (CONFIG_FLV_DECODER && s->h263_flv) {
448  } else {
450  }
451 
452  if (ret == FRAME_SKIPPED)
453  return get_consumed_bytes(s, buf_size);
454 
455  /* skip if the header was thrashed */
456  if (ret < 0) {
457  av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
458  return ret;
459  }
460 
461  if (!s->context_initialized) {
462  avctx->pix_fmt = h263_get_format(avctx);
463  if ((ret = ff_mpv_common_init(s)) < 0)
464  return ret;
465  }
466 
467  if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
468  int i = ff_find_unused_picture(s->avctx, s->picture, 0);
469  if (i < 0)
470  return i;
471  s->current_picture_ptr = &s->picture[i];
472  }
473 
474  avctx->has_b_frames = !s->low_delay;
475 
476 #define SET_QPEL_FUNC(postfix1, postfix2) \
477  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
478  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
479  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
480 
481  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
482  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
483  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
484  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
485  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
486  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
487  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
488 
489  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
490  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
491  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
492  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
493  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
494  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
495  }
496 
497  /* After H.263 & MPEG-4 header decode we have the height, width,
498  * and other parameters. So then we could init the picture.
499  * FIXME: By the way H.263 decoder is evolving it should have
500  * an H263EncContext */
501  if (s->width != avctx->coded_width ||
502  s->height != avctx->coded_height ||
503  s->context_reinit) {
504  /* H.263 could change picture size any time */
505  s->context_reinit = 0;
506 
507  ret = ff_set_dimensions(avctx, s->width, s->height);
508  if (ret < 0)
509  return ret;
510 
511  ff_set_sar(avctx, avctx->sample_aspect_ratio);
512 
513  if ((ret = ff_mpv_common_frame_size_change(s)))
514  return ret;
515 
516  if (avctx->pix_fmt != h263_get_format(avctx)) {
517  av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
518  avctx->pix_fmt = AV_PIX_FMT_NONE;
519  return AVERROR_UNKNOWN;
520  }
521  }
522 
523  if (s->codec_id == AV_CODEC_ID_H263 ||
524  s->codec_id == AV_CODEC_ID_H263P ||
527 
528  // for skipping the frame
531 
532  /* skip B-frames if we don't have reference frames */
533  if (!s->last_picture_ptr &&
534  (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
535  return get_consumed_bytes(s, buf_size);
536  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
537  s->pict_type == AV_PICTURE_TYPE_B) ||
538  (avctx->skip_frame >= AVDISCARD_NONKEY &&
539  s->pict_type != AV_PICTURE_TYPE_I) ||
540  avctx->skip_frame >= AVDISCARD_ALL)
541  return get_consumed_bytes(s, buf_size);
542 
543  if (s->next_p_frame_damaged) {
544  if (s->pict_type == AV_PICTURE_TYPE_B)
545  return get_consumed_bytes(s, buf_size);
546  else
547  s->next_p_frame_damaged = 0;
548  }
549 
550  if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
553  } else {
556  }
557 
558  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
559  return ret;
560 
561  if (!s->divx_packed && !avctx->hwaccel)
562  ff_thread_finish_setup(avctx);
563 
564  if (avctx->hwaccel) {
565  ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
566  s->gb.buffer_end - s->gb.buffer);
567  if (ret < 0 )
568  return ret;
569  }
570 
572 
573  /* the second part of the wmv2 header contains the MB skip bits which
574  * are stored in current_picture->mb_type which is not available before
575  * ff_mpv_frame_start() */
576  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
578  if (ret < 0)
579  return ret;
580  if (ret == 1)
581  goto intrax8_decoded;
582  }
583 
584  /* decode each macroblock */
585  s->mb_x = 0;
586  s->mb_y = 0;
587 
588  ret = decode_slice(s);
589  while (s->mb_y < s->mb_height) {
590  if (s->msmpeg4_version) {
591  if (s->slice_height == 0 || s->mb_x != 0 ||
592  (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
593  break;
594  } else {
595  int prev_x = s->mb_x, prev_y = s->mb_y;
596  if (ff_h263_resync(s) < 0)
597  break;
598  if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
599  s->er.error_occurred = 1;
600  }
601 
602  if (s->msmpeg4_version < 4 && s->h263_pred)
604 
605  if (decode_slice(s) < 0)
606  ret = AVERROR_INVALIDDATA;
607  }
608 
609  if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
611  if (!CONFIG_MSMPEG4_DECODER ||
612  ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
614 
615  assert(s->bitstream_buffer_size == 0);
616 
618  ff_mpeg4_frame_end(avctx, buf, buf_size);
619 
620 intrax8_decoded:
621  ff_er_frame_end(&s->er);
622 
623  if (avctx->hwaccel) {
624  ret = avctx->hwaccel->end_frame(avctx);
625  if (ret < 0)
626  return ret;
627  }
628 
629  ff_mpv_frame_end(s);
630 
631  if (!s->divx_packed && avctx->hwaccel)
632  ff_thread_finish_setup(avctx);
633 
634  assert(s->current_picture.f->pict_type ==
636  assert(s->current_picture.f->pict_type == s->pict_type);
637  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
638  if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
639  return ret;
641  } else if (s->last_picture_ptr) {
642  if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
643  return ret;
645  }
646 
647  if (s->last_picture_ptr || s->low_delay)
648  *got_frame = 1;
649 
650  if (ret && (avctx->err_recognition & AV_EF_EXPLODE))
651  return ret;
652  else
653  return get_consumed_bytes(s, buf_size);
654 }
655 
657 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
659 #endif
660 #if CONFIG_MPEG4_VDPAU_HWACCEL
662 #endif
665 };
666 
668  .name = "h263",
669  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
670  .type = AVMEDIA_TYPE_VIDEO,
671  .id = AV_CODEC_ID_H263,
672  .priv_data_size = sizeof(MpegEncContext),
674  .close = ff_h263_decode_end,
678  .flush = ff_mpeg_flush,
680 };
int bitstream_buffer_size
Definition: mpegvideo.h:401
const struct AVCodec * codec
Definition: avcodec.h:1418
discard all frames except keyframes
Definition: avcodec.h:688
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:1744
qpel_mc_func avg_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:74
int picture_number
Definition: mpegvideo.h:122
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
MPEG-2/4, H.264 default.
Definition: pixfmt.h:378
This structure describes decoded (raw) audio or video data.
Definition: frame.h:140
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1595
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:482
qpel_mc_func put_no_rnd_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:75
#define ER_MB_END
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:134
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:187
static int decode_slice(MpegEncContext *s)
Definition: h263dec.c:173
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:421
av_cold void ff_h263dsp_init(H263DSPContext *ctx)
Definition: h263dsp.c:117
int size
Definition: avcodec.h:1347
uint8_t * bitstream_buffer
Definition: mpegvideo.h:400
enum AVCodecID codec_id
Definition: mpegvideo.h:107
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, 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)
#define AV_EF_BUFFER
Definition: avcodec.h:2680
const uint8_t * buffer
Definition: get_bits.h:55
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:1804
void ff_print_debug_info(MpegEncContext *s, Picture *p)
Print debugging info for the given picture.
Definition: mpegvideo.c:1284
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1621
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size)
Definition: msmpeg4dec.c:538
mpegvideo header.
discard all
Definition: avcodec.h:689
int padding_bug_score
used to detect the VERY common padding bug in MPEG-4
Definition: mpegvideo.h:396
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:128
QpelDSPContext qdsp
Definition: mpegvideo.h:226
AVCodec.
Definition: avcodec.h:3120
int qscale
QP.
Definition: mpegvideo.h:199
int quant_precision
Definition: mpegvideo.h:385
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:602
enum AVDiscard skip_frame
Definition: avcodec.h:2989
void ff_mpeg4_clean_buffers(MpegEncContext *s)
Definition: mpeg4video.c:45
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2696
#define AV_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:863
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo.c:1737
int context_reinit
Definition: mpegvideo.h:526
static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
Definition: h263dec.c:45
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:107
uint8_t
#define av_cold
Definition: attributes.h:66
enum OutputFormat out_format
output format
Definition: mpegvideo.h:99
int ff_mpv_common_frame_size_change(MpegEncContext *s)
Definition: mpegvideo.c:926
Multithreading support functions.
#define ER_MB_ERROR
qpel_mc_func(* qpel_put)[16]
Definition: motion_est.h:86
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:199
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1523
int no_rounding
apply no rounding to motion compensation (MPEG-4, msmpeg4, ...) for B-frames rounding mode is always ...
Definition: mpegvideo.h:278
void ff_mpv_decode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:1727
int ff_intel_h263_decode_picture_header(MpegEncContext *s)
Definition: intelh263dec.c:27
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:175
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:346
int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
Definition: mpegpicture.c:398
quarterpel DSP functions
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:1346
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2584
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:182
int ff_set_sar(AVCodecContext *avctx, AVRational sar)
Check that the provided sample aspect ratio is valid and set it on the codec context.
Definition: utils.c:146
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:300
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:124
#define CONFIG_H263I_DECODER
Definition: config.h:586
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...
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2134
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:680
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:1806
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:390
const uint8_t * ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end)
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:526
enum AVCodecID id
Definition: avcodec.h:3134
H263DSPContext h263dsp
Definition: mpegvideo.h:228
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1715
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:180
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
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:227
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:390
#define AVERROR(e)
Definition: error.h:43
AVCodec ff_h263_decoder
Definition: h263dec.c:667
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:215
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:148
ERContext er
Definition: mpegvideo.h:528
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1503
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2578
const char * name
Name of the codec implementation.
Definition: avcodec.h:3127
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:391
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:73
GetBitContext gb
Definition: mpegvideo.h:431
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:998
int ff_flv_decode_picture_header(MpegEncContext *s)
Definition: flvdec.c:39
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:1776
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:344
uint8_t * error_status_table
#define ER_AC_ERROR
void ff_h263_loop_filter(MpegEncContext *s)
Definition: h263.c:135
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:832
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3141
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:201
#define CONFIG_MPEG4_DECODER
Definition: config.h:624
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2670
static int get_consumed_bytes(MpegEncContext *s, int buf_size)
Return the number of bytes consumed for building the current frame.
Definition: h263dec.c:147
int last_index
Definition: parser.h:31
int next_p_frame_damaged
set if the next p frame is damaged, to avoid showing trashed B-frames
Definition: mpegvideo.h:348
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: avconv.c:1288
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:179
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:45
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode MPEG-4 headers.
int size_in_bits
Definition: get_bits.h:57
int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:140
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:250
MotionEstContext me
Definition: mpegvideo.h:276
#define AV_EF_EXPLODE
Definition: avcodec.h:2681
#define FRAME_SKIPPED
Return value for header parsers if frame is not coded.
Definition: mpegutils.h:34
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:478
#define SET_QPEL_FUNC(postfix1, postfix2)
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:373
void ff_mpv_decode_defaults(MpegEncContext *s)
Set the given MpegEncContext to defaults for decoding.
Definition: mpegvideo.c:615
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:136
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
Definition: utils.c:785
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:260
int first_slice_line
used in MPEG-4 too to handle resync markers
Definition: mpegvideo.h:419
NULL
Definition: eval.c:55
Libavcodec external API header.
void ff_h263_update_motion_val(MpegEncContext *s)
Definition: h263.c:42
#define ff_dlog(ctx,...)
Definition: internal.h:60
int h263_flv
use flv H.263 header
Definition: mpegvideo.h:105
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:3325
enum AVCodecID codec_id
Definition: avcodec.h:1426
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:395
main external API structure.
Definition: avcodec.h:1409
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:95
#define SLICE_END
end marker found
Definition: mpegvideo.h:481
Picture * picture
main picture buffer
Definition: mpegvideo.h:131
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:389
int extradata_size
Definition: avcodec.h:1524
#define CONFIG_H263_DECODER
Definition: config.h:585
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
int coded_height
Definition: avcodec.h:1595
struct AVFrame * f
Definition: mpegpicture.h:46
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: pixfmt.h:189
int context_initialized
Definition: mpegvideo.h:119
int slice_height
in macroblocks
Definition: mpegvideo.h:418
#define CONFIG_FLV_DECODER
Definition: config.h:578
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:870
int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
generic function called after decoding the header and before a frame is decoded.
Definition: mpegvideo.c:1052
#define MV_DIR_FORWARD
Definition: mpegvideo.h:256
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:206
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:257
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:839
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2572
int h263_pred
use MPEG-4/H.263 ac/dc predictions
Definition: mpegvideo.h:100
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:53
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:233
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:3314
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:146
qpel_mc_func(* qpel_avg)[16]
Definition: motion_est.h:87
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:3301
MpegEncContext.
Definition: mpegvideo.h:76
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:178
struct AVCodecContext * avctx
Definition: mpegvideo.h:93
discard all non reference
Definition: avcodec.h:686
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:59
common internal api header.
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:125
static av_cold void flush(AVCodecContext *avctx)
Flush (reset) the frame ID after seeking.
Definition: alsdec.c:1797
const uint8_t * buffer_end
Definition: get_bits.h:55
int ff_wmv2_decode_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:120
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:656
Picture * last_picture_ptr
pointer to the previous picture.
Definition: mpegvideo.h:177
Bi-dir predicted.
Definition: avutil.h:262
int workaround_bugs
Work around bugs in encoders which sometimes cannot be detected automatically.
Definition: avcodec.h:2571
#define H263_GOB_HEIGHT(h)
Definition: h263.h:44
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:61
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:582
void * priv_data
Definition: avcodec.h:1451
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:763
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1263
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:345
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:476
ParseContext parse_context
Definition: mpegvideo.h:350
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:196
#define CONFIG_WMV2_DECODER
Definition: config.h:712
#define AV_CODEC_FLAG_TRUNCATED
Input bitstream might be truncated at a random location instead of only at frame boundaries.
Definition: avcodec.h:772
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:114
MPEG-1, JPEG, H.263.
Definition: pixfmt.h:379
#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.
av_cold void ff_qpeldsp_init(QpelDSPContext *c)
Definition: qpeldsp.c:735
#define CONFIG_MSMPEG4_DECODER
Definition: msmpeg4.h:69
int ff_h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
Definition: h263_parser.c:30
AVPixelFormat
Pixel format.
Definition: pixfmt.h:57
This structure stores compressed data.
Definition: avcodec.h:1323
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:1820
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:838