FFmpeg
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 "hwaccel.h"
37 #include "internal.h"
38 #include "mpeg_er.h"
39 #include "mpeg4video.h"
40 #include "mpeg4video_parser.h"
41 #include "mpegutils.h"
42 #include "mpegvideo.h"
43 #include "msmpeg4.h"
44 #include "qpeldsp.h"
45 #include "thread.h"
46 #include "wmv2.h"
47 
49 {
50  /* MPEG-4 Studio Profile only, not supported by hardware */
51  if (avctx->bits_per_raw_sample > 8) {
52  av_assert1(((MpegEncContext *)avctx->priv_data)->studio_profile);
53  return avctx->pix_fmt;
54  }
55 
56  if (avctx->codec->id == AV_CODEC_ID_MSS2)
57  return AV_PIX_FMT_YUV420P;
58 
59  if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) {
62  return AV_PIX_FMT_GRAY8;
63  }
64 
65  return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
66 }
67 
69 {
70  MpegEncContext *s = avctx->priv_data;
71  int ret;
72 
73  s->out_format = FMT_H263;
74 
75  // set defaults
77  ff_mpv_decode_init(s, avctx);
78 
79  s->quant_precision = 5;
81  s->low_delay = 1;
82  s->unrestricted_mv = 1;
83 
84  /* select sub codec */
85  switch (avctx->codec->id) {
86  case AV_CODEC_ID_H263:
87  case AV_CODEC_ID_H263P:
88  s->unrestricted_mv = 0;
90  break;
91  case AV_CODEC_ID_MPEG4:
92  break;
94  s->h263_pred = 1;
95  s->msmpeg4_version = 1;
96  break;
98  s->h263_pred = 1;
99  s->msmpeg4_version = 2;
100  break;
102  s->h263_pred = 1;
103  s->msmpeg4_version = 3;
104  break;
105  case AV_CODEC_ID_WMV1:
106  s->h263_pred = 1;
107  s->msmpeg4_version = 4;
108  break;
109  case AV_CODEC_ID_WMV2:
110  s->h263_pred = 1;
111  s->msmpeg4_version = 5;
112  break;
113  case AV_CODEC_ID_VC1:
114  case AV_CODEC_ID_WMV3:
117  case AV_CODEC_ID_MSS2:
118  s->h263_pred = 1;
119  s->msmpeg4_version = 6;
121  break;
122  case AV_CODEC_ID_H263I:
123  break;
124  case AV_CODEC_ID_FLV1:
125  s->h263_flv = 1;
126  break;
127  default:
128  av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
129  avctx->codec->id);
130  return AVERROR(ENOSYS);
131  }
132  s->codec_id = avctx->codec->id;
133 
134  if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
135  if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
136  s->ehc_mode = 1;
137 
138  /* for H.263, we allocate the images after having read the header */
139  if (avctx->codec->id != AV_CODEC_ID_H263 &&
140  avctx->codec->id != AV_CODEC_ID_H263P &&
141  avctx->codec->id != AV_CODEC_ID_MPEG4) {
142  avctx->pix_fmt = h263_get_format(avctx);
143  ff_mpv_idct_init(s);
144  if ((ret = ff_mpv_common_init(s)) < 0)
145  return ret;
146  }
147 
149  ff_qpeldsp_init(&s->qdsp);
151 
152  return 0;
153 }
154 
156 {
157  MpegEncContext *s = avctx->priv_data;
158 
160  return 0;
161 }
162 
163 /**
164  * Return the number of bytes consumed for building the current frame.
165  */
166 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
167 {
168  int pos = (get_bits_count(&s->gb) + 7) >> 3;
169 
170  if (s->divx_packed || s->avctx->hwaccel) {
171  /* We would have to scan through the whole buf to handle the weird
172  * reordering ... */
173  return buf_size;
174  } else if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
175  pos -= s->parse_context.last_index;
176  // padding is not really read so this might be -1
177  if (pos < 0)
178  pos = 0;
179  return pos;
180  } else {
181  // avoid infinite loops (maybe not needed...)
182  if (pos == 0)
183  pos = 1;
184  // oops ;)
185  if (pos + 10 > buf_size)
186  pos = buf_size;
187 
188  return pos;
189  }
190 }
191 
193 {
194  const int part_mask = s->partitioned_frame
195  ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
196  const int mb_size = 16 >> s->avctx->lowres;
197  int ret;
198 
199  s->last_resync_gb = s->gb;
200  s->first_slice_line = 1;
201  s->resync_mb_x = s->mb_x;
202  s->resync_mb_y = s->mb_y;
203 
204  ff_set_qscale(s, s->qscale);
205 
206  if (s->studio_profile) {
208  return ret;
209  }
210 
211  if (s->avctx->hwaccel) {
212  const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
213  ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
214  // ensure we exit decode loop
215  s->mb_y = s->mb_height;
216  return ret;
217  }
218 
219  if (s->partitioned_frame) {
220  const int qscale = s->qscale;
221 
222  if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
223  if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
224  return ret;
225 
226  /* restore variables which were modified */
227  s->first_slice_line = 1;
228  s->mb_x = s->resync_mb_x;
229  s->mb_y = s->resync_mb_y;
230  ff_set_qscale(s, qscale);
231  }
232 
233  for (; s->mb_y < s->mb_height; s->mb_y++) {
234  /* per-row end of slice checks */
235  if (s->msmpeg4_version) {
236  if (s->resync_mb_y + s->slice_height == s->mb_y) {
238  s->mb_x - 1, s->mb_y, ER_MB_END);
239 
240  return 0;
241  }
242  }
243 
244  if (s->msmpeg4_version == 1) {
245  s->last_dc[0] =
246  s->last_dc[1] =
247  s->last_dc[2] = 128;
248  }
249 
251  for (; s->mb_x < s->mb_width; s->mb_x++) {
252  int ret;
253 
255 
256  if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
257  s->first_slice_line = 0;
258 
259  /* DCT & quantize */
260 
261  s->mv_dir = MV_DIR_FORWARD;
262  s->mv_type = MV_TYPE_16X16;
263  ff_dlog(s, "%d %06X\n",
264  get_bits_count(&s->gb), show_bits(&s->gb, 24));
265 
266  ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
267  ret = s->decode_mb(s, s->block);
268 
269  if (s->pict_type != AV_PICTURE_TYPE_B)
271 
272  if (ret < 0) {
273  const int xy = s->mb_x + s->mb_y * s->mb_stride;
274  if (ret == SLICE_END) {
276  if (s->loop_filter)
278 
280  s->mb_x, s->mb_y, ER_MB_END & part_mask);
281 
282  s->padding_bug_score--;
283 
284  if (++s->mb_x >= s->mb_width) {
285  s->mb_x = 0;
286  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
288  s->mb_y++;
289  }
290  return 0;
291  } else if (ret == SLICE_NOEND) {
293  "Slice mismatch at MB: %d\n", xy);
295  s->mb_x + 1, s->mb_y,
296  ER_MB_END & part_mask);
297  return AVERROR_INVALIDDATA;
298  }
299  av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
301  s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
302 
304  continue;
305  return AVERROR_INVALIDDATA;
306  }
307 
309  if (s->loop_filter)
311  }
312 
313  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
315 
316  s->mb_x = 0;
317  }
318 
319  av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
320 
321  // Detect incorrect padding with wrong stuffing codes used by NEC N-02B
322  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
324  get_bits_left(&s->gb) >= 48 &&
325  show_bits(&s->gb, 24) == 0x4010 &&
326  !s->data_partitioning)
327  s->padding_bug_score += 32;
328 
329  /* try to detect the padding bug */
330  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
332  get_bits_left(&s->gb) >= 0 &&
333  get_bits_left(&s->gb) < 137 &&
334  !s->data_partitioning) {
335  const int bits_count = get_bits_count(&s->gb);
336  const int bits_left = s->gb.size_in_bits - bits_count;
337 
338  if (bits_left == 0) {
339  s->padding_bug_score += 16;
340  } else if (bits_left != 1) {
341  int v = show_bits(&s->gb, 8);
342  v |= 0x7F >> (7 - (bits_count & 7));
343 
344  if (v == 0x7F && bits_left <= 8)
345  s->padding_bug_score--;
346  else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
347  bits_left <= 16)
348  s->padding_bug_score += 4;
349  else
350  s->padding_bug_score++;
351  }
352  }
353 
354  if (s->codec_id == AV_CODEC_ID_H263 &&
356  get_bits_left(&s->gb) >= 8 &&
357  get_bits_left(&s->gb) < 300 &&
359  show_bits(&s->gb, 8) == 0 &&
360  !s->data_partitioning) {
361 
362  s->padding_bug_score += 32;
363  }
364 
365  if (s->codec_id == AV_CODEC_ID_H263 &&
367  get_bits_left(&s->gb) >= 64 &&
368  AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
369 
370  s->padding_bug_score += 32;
371  }
372 
374  if (
375  (s->padding_bug_score > -2 && !s->data_partitioning))
377  else
379  }
380 
381  // handle formats which don't have unique end markers
382  if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
383  int left = get_bits_left(&s->gb);
384  int max_extra = 7;
385 
386  /* no markers in M$ crap */
388  max_extra += 17;
389 
390  /* buggy padding but the frame should still end approximately at
391  * the bitstream end */
392  if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
394  max_extra += 48;
395  else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
396  max_extra += 256 * 256 * 256 * 64;
397 
398  if (left > max_extra)
400  "discarding %d junk bits at end, next would be %X\n",
401  left, show_bits(&s->gb, 24));
402  else if (left < 0)
403  av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
404  else
406  s->mb_x - 1, s->mb_y, ER_MB_END);
407 
408  return 0;
409  }
410 
412  "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
413  get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
414 
415  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
416  ER_MB_END & part_mask);
417 
418  return AVERROR_INVALIDDATA;
419 }
420 
421 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
422  AVPacket *avpkt)
423 {
424  const uint8_t *buf = avpkt->data;
425  int buf_size = avpkt->size;
426  MpegEncContext *s = avctx->priv_data;
427  int ret;
428  int slice_ret = 0;
429  AVFrame *pict = data;
430 
431  /* no supplementary picture */
432  if (buf_size == 0) {
433  /* special case for last picture */
434  if (s->low_delay == 0 && s->next_picture_ptr) {
435  if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
436  return ret;
437  s->next_picture_ptr = NULL;
438 
439  *got_frame = 1;
440  }
441 
442  return 0;
443  }
444 
445  if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
446  int next;
447 
448  if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
449  next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
450  } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
451  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
452  } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
453  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
454  } else {
456  "this codec does not support truncated bitstreams\n");
457  return AVERROR(ENOSYS);
458  }
459 
460  if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
461  &buf_size) < 0)
462  return buf_size;
463  }
464 
465 retry:
466  if (s->divx_packed && s->bitstream_buffer_size) {
467  int i;
468  for(i=0; i < buf_size-3; i++) {
469  if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
470  if (buf[i+3]==0xB0) {
471  av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
472  s->bitstream_buffer_size = 0;
473  }
474  break;
475  }
476  }
477  }
478 
479  if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder
480  ret = init_get_bits8(&s->gb, s->bitstream_buffer,
482  else
483  ret = init_get_bits8(&s->gb, buf, buf_size);
484 
485  s->bitstream_buffer_size = 0;
486  if (ret < 0)
487  return ret;
488 
489  if (!s->context_initialized)
490  // we need the idct permutation for reading a custom matrix
491  ff_mpv_idct_init(s);
492 
493  /* let's go :-) */
494  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
496  } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
498  } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
499  if (s->avctx->extradata_size && s->picture_number == 0) {
500  GetBitContext gb;
501 
502  if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
504  }
505  ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb, 0);
506  } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
508  } else if (CONFIG_FLV_DECODER && s->h263_flv) {
510  } else {
512  }
513 
514  if (ret < 0 || ret == FRAME_SKIPPED) {
515  if ( s->width != avctx->coded_width
516  || s->height != avctx->coded_height) {
517  av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
518  s->width = avctx->coded_width;
519  s->height= avctx->coded_height;
520  }
521  }
522  if (ret == FRAME_SKIPPED)
523  return get_consumed_bytes(s, buf_size);
524 
525  /* skip if the header was thrashed */
526  if (ret < 0) {
527  av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
528  return ret;
529  }
530 
531  if (!s->context_initialized) {
532  avctx->pix_fmt = h263_get_format(avctx);
533  if ((ret = ff_mpv_common_init(s)) < 0)
534  return ret;
535  }
536 
537  if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
538  int i = ff_find_unused_picture(s->avctx, s->picture, 0);
539  if (i < 0)
540  return i;
541  s->current_picture_ptr = &s->picture[i];
542  }
543 
544  avctx->has_b_frames = !s->low_delay;
545 
546  if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
547  if (ff_mpeg4_workaround_bugs(avctx) == 1)
548  goto retry;
549  if (s->studio_profile != (s->idsp.idct == NULL))
550  ff_mpv_idct_init(s);
551  }
552 
553  /* After H.263 & MPEG-4 header decode we have the height, width,
554  * and other parameters. So then we could init the picture.
555  * FIXME: By the way H.263 decoder is evolving it should have
556  * an H263EncContext */
557  if (s->width != avctx->coded_width ||
558  s->height != avctx->coded_height ||
559  s->context_reinit) {
560  /* H.263 could change picture size any time */
561  s->context_reinit = 0;
562 
563  ret = ff_set_dimensions(avctx, s->width, s->height);
564  if (ret < 0)
565  return ret;
566 
567  ff_set_sar(avctx, avctx->sample_aspect_ratio);
568 
569  if ((ret = ff_mpv_common_frame_size_change(s)))
570  return ret;
571 
572  if (avctx->pix_fmt != h263_get_format(avctx)) {
573  av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
574  avctx->pix_fmt = AV_PIX_FMT_NONE;
575  return AVERROR_UNKNOWN;
576  }
577  }
578 
579  if (s->codec_id == AV_CODEC_ID_H263 ||
580  s->codec_id == AV_CODEC_ID_H263P ||
583 
584  // for skipping the frame
587 
588  /* skip B-frames if we don't have reference frames */
589  if (!s->last_picture_ptr &&
590  (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
591  return get_consumed_bytes(s, buf_size);
592  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
593  s->pict_type == AV_PICTURE_TYPE_B) ||
594  (avctx->skip_frame >= AVDISCARD_NONKEY &&
595  s->pict_type != AV_PICTURE_TYPE_I) ||
596  avctx->skip_frame >= AVDISCARD_ALL)
597  return get_consumed_bytes(s, buf_size);
598 
599  if (s->next_p_frame_damaged) {
600  if (s->pict_type == AV_PICTURE_TYPE_B)
601  return get_consumed_bytes(s, buf_size);
602  else
603  s->next_p_frame_damaged = 0;
604  }
605 
606  if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
609  } else {
612  }
613 
614  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
615  return ret;
616 
617  if (!s->divx_packed && !avctx->hwaccel)
618  ff_thread_finish_setup(avctx);
619 
620  if (avctx->hwaccel) {
621  ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
622  s->gb.buffer_end - s->gb.buffer);
623  if (ret < 0 )
624  return ret;
625  }
626 
628 
629  /* the second part of the wmv2 header contains the MB skip bits which
630  * are stored in current_picture->mb_type which is not available before
631  * ff_mpv_frame_start() */
632  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
634  if (ret < 0)
635  return ret;
636  if (ret == 1)
637  goto frame_end;
638  }
639 
640  /* decode each macroblock */
641  s->mb_x = 0;
642  s->mb_y = 0;
643 
644  slice_ret = decode_slice(s);
645  while (s->mb_y < s->mb_height) {
646  if (s->msmpeg4_version) {
647  if (s->slice_height == 0 || s->mb_x != 0 || slice_ret < 0 ||
648  (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
649  break;
650  } else {
651  int prev_x = s->mb_x, prev_y = s->mb_y;
652  if (ff_h263_resync(s) < 0)
653  break;
654  if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
655  s->er.error_occurred = 1;
656  }
657 
658  if (s->msmpeg4_version < 4 && s->h263_pred)
660 
661  if (decode_slice(s) < 0)
662  slice_ret = AVERROR_INVALIDDATA;
663  }
664 
665  if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
667  if (!CONFIG_MSMPEG4_DECODER ||
668  ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
670 
672 frame_end:
673  if (!s->studio_profile)
674  ff_er_frame_end(&s->er);
675 
676  if (avctx->hwaccel) {
677  ret = avctx->hwaccel->end_frame(avctx);
678  if (ret < 0)
679  return ret;
680  }
681 
682  ff_mpv_frame_end(s);
683 
684  if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
685  ff_mpeg4_frame_end(avctx, buf, buf_size);
686 
687  if (!s->divx_packed && avctx->hwaccel)
688  ff_thread_finish_setup(avctx);
689 
692  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
693  if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
694  return ret;
697  } else if (s->last_picture_ptr) {
698  if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
699  return ret;
702  }
703 
704  if (s->last_picture_ptr || s->low_delay) {
705  if ( pict->format == AV_PIX_FMT_YUV420P
706  && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
707  int x, y, p;
709  for (p=0; p<3; p++) {
710  int w = AV_CEIL_RSHIFT(pict-> width, !!p);
711  int h = AV_CEIL_RSHIFT(pict->height, !!p);
712  int linesize = pict->linesize[p];
713  for (y=0; y<(h>>1); y++)
714  for (x=0; x<w; x++)
715  FFSWAP(int,
716  pict->data[p][x + y*linesize],
717  pict->data[p][x + (h-1-y)*linesize]);
718  }
719  }
720  *got_frame = 1;
721  }
722 
723  if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
724  return slice_ret;
725  else
726  return get_consumed_bytes(s, buf_size);
727 }
728 
730 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
732 #endif
733 #if CONFIG_MPEG4_NVDEC_HWACCEL
735 #endif
736 #if CONFIG_MPEG4_VDPAU_HWACCEL
738 #endif
739 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
741 #endif
744 };
745 
747 #if CONFIG_H263_VAAPI_HWACCEL
748  HWACCEL_VAAPI(h263),
749 #endif
750 #if CONFIG_MPEG4_NVDEC_HWACCEL
751  HWACCEL_NVDEC(mpeg4),
752 #endif
753 #if CONFIG_MPEG4_VDPAU_HWACCEL
754  HWACCEL_VDPAU(mpeg4),
755 #endif
756 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
757  HWACCEL_VIDEOTOOLBOX(h263),
758 #endif
759  NULL
760 };
761 
763  .name = "h263",
764  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
765  .type = AVMEDIA_TYPE_VIDEO,
766  .id = AV_CODEC_ID_H263,
767  .priv_data_size = sizeof(MpegEncContext),
769  .close = ff_h263_decode_end,
773  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
774  .flush = ff_mpeg_flush,
775  .max_lowres = 3,
777  .hw_configs = ff_h263_hw_config_list,
778 };
779 
781  .name = "h263p",
782  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
783  .type = AVMEDIA_TYPE_VIDEO,
784  .id = AV_CODEC_ID_H263P,
785  .priv_data_size = sizeof(MpegEncContext),
787  .close = ff_h263_decode_end,
791  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
792  .flush = ff_mpeg_flush,
793  .max_lowres = 3,
795  .hw_configs = ff_h263_hw_config_list,
796 };
int bitstream_buffer_size
Definition: mpegvideo.h:416
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2713
#define ff_tlog(ctx,...)
Definition: internal.h:75
IDCTDSPContext idsp
Definition: mpegvideo.h:230
#define NULL
Definition: coverity.c:32
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
Definition: decode.c:1370
const struct AVCodec * codec
Definition: avcodec.h:1577
discard all frames except keyframes
Definition: avcodec.h:813
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2274
qpel_mc_func avg_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:74
int picture_number
Definition: mpegvideo.h:127
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
MPEG-2/4 4:2:0, H.264 default for 4:2:0.
Definition: pixfmt.h:544
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static void flush(AVCodecContext *avctx)
#define HWACCEL_NVDEC(codec)
Definition: hwaccel.h:71
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1756
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:519
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
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:104
hardware decoding through Videotoolbox
Definition: pixfmt.h:282
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static int decode_slice(MpegEncContext *s)
Definition: h263dec.c:192
void ff_er_frame_end(ERContext *s)
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:2203
int msmpeg4_version
0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
Definition: mpegvideo.h:438
av_cold void ff_h263dsp_init(H263DSPContext *ctx)
Definition: h263dsp.c:117
int size
Definition: avcodec.h:1481
uint8_t * bitstream_buffer
Definition: mpegvideo.h:415
enum AVCodecID codec_id
Definition: mpegvideo.h:112
#define AV_EF_BUFFER
detect improper bitstream length
Definition: avcodec.h:2707
const uint8_t * buffer
Definition: get_bits.h:62
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:1947
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1778
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
int studio_profile
Definition: mpegvideo.h:384
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size)
Definition: msmpeg4dec.c:567
mpegvideo header.
discard all
Definition: avcodec.h:814
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2799
int padding_bug_score
used to detect the VERY common padding bug in MPEG-4
Definition: mpegvideo.h:411
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:133
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2732
QpelDSPContext qdsp
Definition: mpegvideo.h:235
AVCodec.
Definition: avcodec.h:3492
int qscale
QP.
Definition: mpegvideo.h:204
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
int quant_precision
Definition: mpegvideo.h:400
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:697
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:3043
void ff_mpeg4_clean_buffers(MpegEncContext *s)
Definition: mpeg4video.c:45
#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:1009
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo.c:2267
int context_reinit
Definition: mpegvideo.h:564
static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
Definition: h263dec.c:48
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:108
uint8_t
#define av_cold
Definition: attributes.h:82
enum OutputFormat out_format
output format
Definition: mpegvideo.h:104
int ff_mpv_common_frame_size_change(MpegEncContext *s)
Definition: mpegvideo.c:1054
Multithreading support functions.
#define ER_MB_ERROR
qpel_mc_func(* qpel_put)[16]
Definition: motion_est.h:91
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:443
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1669
int no_rounding
apply no rounding to motion compensation (MPEG-4, msmpeg4, ...) for B-frames rounding mode is always ...
Definition: mpegvideo.h:284
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:180
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:358
int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
Definition: mpegpicture.c:451
quarterpel DSP functions
uint8_t * data
Definition: avcodec.h:1480
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
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:119
#define ff_dlog(a,...)
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:330
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:129
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:2807
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:120
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:886
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2210
#define av_log(a,...)
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:737
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2338
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:411
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
enum AVCodecID id
Definition: avcodec.h:3506
H263DSPContext h263dsp
Definition: mpegvideo.h:237
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1858
const AVCodecHWConfigInternal * ff_h263_hw_config_list[]
Definition: h263dec.c:746
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:185
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:234
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:405
AVCodec ff_h263_decoder
Definition: h263dec.c:762
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:223
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
ERContext er
Definition: mpegvideo.h:566
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1648
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2606
int(* decode_mb)(struct MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.h:510
const char * name
Name of the codec implementation.
Definition: avcodec.h:3499
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:406
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:73
GetBitContext gb
Definition: mpegvideo.h:448
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1133
int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
Decode the next video packet.
int ff_flv_decode_picture_header(MpegEncContext *s)
Definition: flvdec.c:28
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2307
static void frame_end(MpegEncContext *s)
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:356
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:978
int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type)
Definition: mpegvideo.c:1446
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3513
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:378
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2697
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
static int get_consumed_bytes(MpegEncContext *s, int buf_size)
Return the number of bytes consumed for building the current frame.
Definition: h263dec.c:166
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:360
#define width
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call ff_thread_finish_setup() afterwards.If some code can't be moved
uint8_t w
Definition: llviddspenc.c:38
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:184
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:46
int size_in_bits
Definition: get_bits.h:68
int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:171
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:446
#define s(width, name)
Definition: cbs_vp9.c:257
AVCodec ff_h263p_decoder
Definition: h263dec.c:780
MotionEstContext me
Definition: mpegvideo.h:282
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2708
#define FRAME_SKIPPED
Return value for header parsers if frame is not coded.
Definition: mpegutils.h:34
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:421
HW acceleration through CUDA.
Definition: pixfmt.h:235
void ff_mpv_decode_defaults(MpegEncContext *s)
Set the given MpegEncContext to defaults for decoding.
Definition: mpegvideo.c:671
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:155
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:368
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
int first_slice_line
used in MPEG-4 too to handle resync markers
Definition: mpegvideo.h:436
Libavcodec external API header.
void ff_h263_update_motion_val(MpegEncContext *s)
Definition: h263.c:42
int h263_flv
use flv H.263 header
Definition: mpegvideo.h:110
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:3761
enum AVCodecID codec_id
Definition: avcodec.h:1578
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
main external API structure.
Definition: avcodec.h:1568
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:100
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> (&#39;D&#39;<<24) + (&#39;C&#39;<<16) + (&#39;B&#39;<<8) + &#39;A&#39;).
Definition: avcodec.h:1593
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2]...the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so...,+,-,+,-,+,+,-,+,-,+,...hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32-hcoeff[1]-hcoeff[2]-...a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2}an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||.........intra?||||:Block01:yes no||||:Block02:.................||||:Block03::y DC::ref index:||||:Block04::cb DC::motion x:||||.........:cr DC::motion y:||||.................|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------------------------------|||Y subbands||Cb subbands||Cr subbands||||------||------||------|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||------||------||------||||------||------||------|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||------||------||------||||------||------||------|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||------||------||------||||------||------||------|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------------------------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction------------|\Dequantization-------------------\||Reference frames|\IDWT|--------------|Motion\|||Frame 0||Frame 1||Compensation.OBMC v-------|--------------|--------------.\------> Frame n output Frame Frame<----------------------------------/|...|-------------------Range Coder:============Binary Range Coder:-------------------The implemented range coder is an adapted version based upon"Range encoding: an algorithm for removing redundancy from a digitised message."by G.N.N.Martin.The symbols encoded by the Snow range coder are bits(0|1).The associated probabilities are not fix but change depending on the symbol mix seen so far.bit seen|new state---------+-----------------------------------------------0|256-state_transition_table[256-old_state];1|state_transition_table[old_state];state_transition_table={0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:-------------------------FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1.the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:206
void * buf
Definition: avisynth_c.h:766
void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
Definition: mpegvideo.c:1439
#define SLICE_END
end marker found
Definition: mpegvideo.h:518
Picture * picture
main picture buffer
Definition: mpegvideo.h:136
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:404
int extradata_size
Definition: avcodec.h:1670
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
int coded_height
Definition: avcodec.h:1756
struct AVFrame * f
Definition: mpegpicture.h:46
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: pixfmt.h:197
int context_initialized
Definition: mpegvideo.h:124
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2710
int slice_height
in macroblocks
Definition: mpegvideo.h:435
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:999
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:1207
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:212
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:985
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2603
int h263_pred
use MPEG-4/H.263 ac/dc predictions
Definition: mpegvideo.h:105
#define HWACCEL_VAAPI(codec)
Definition: hwaccel.h:73
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:68
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
Definition: ituh263dec.c:213
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
Definition: frame.c:611
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:3750
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
qpel_mc_func(* qpel_avg)[16]
Definition: motion_est.h:92
the normal 219*2^(n-8) "MPEG" YUV ranges
Definition: pixfmt.h:522
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:3722
MpegEncContext.
Definition: mpegvideo.h:81
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:183
struct AVCodecContext * avctx
Definition: mpegvideo.h:98
discard all non reference
Definition: avcodec.h:810
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_RB64
Definition: bytestream.h:87
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
Y , 8bpp.
Definition: pixfmt.h:74
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:130
void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
Definition: mpegvideo.c:676
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: internal.h:60
const uint8_t * buffer_end
Definition: get_bits.h:62
int ff_wmv2_decode_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:136
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:729
Picture * last_picture_ptr
pointer to the previous picture.
Definition: mpegvideo.h:182
Bi-dir predicted.
Definition: avutil.h:276
#define H263_GOB_HEIGHT(h)
Definition: h263.h:42
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
void * priv_data
Definition: avcodec.h:1595
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:894
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1431
void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:2255
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:357
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:508
ParseContext parse_context
Definition: mpegvideo.h:362
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:373
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header)
Decode MPEG-4 headers.
#define AV_CODEC_FLAG_TRUNCATED
Input bitstream might be truncated at a random location instead of only at frame boundaries.
Definition: avcodec.h:895
int height
Definition: frame.h:353
#define HWACCEL_VDPAU(codec)
Definition: hwaccel.h:75
void INT64 start
Definition: avisynth_c.h:766
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:119
MPEG-1 4:2:0, JPEG 4:2:0, H.263 4:2:0.
Definition: pixfmt.h:545
#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:783
#define FFSWAP(type, a, b)
Definition: common.h:99
#define CONFIG_MSMPEG4_DECODER
Definition: msmpeg4.h:69
void(* idct)(int16_t *block)
Definition: idctdsp.h:65
int ff_h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
Definition: h263_parser.c:30
#define FF_QSCALE_TYPE_MPEG1
Definition: internal.h:81
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
This structure stores compressed data.
Definition: avcodec.h:1457
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:2352
#define MAX_NVOP_SIZE
Definition: mpeg4video.h:72
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:984
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58