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"
32 
33 #include "avcodec.h"
34 #include "error_resilience.h"
35 #include "flv.h"
36 #include "h263.h"
37 #include "h263_parser.h"
38 #include "hwconfig.h"
39 #include "internal.h"
40 #include "mpeg_er.h"
41 #include "mpeg4video.h"
42 #include "mpeg4video_parser.h"
43 #include "mpegutils.h"
44 #include "mpegvideo.h"
45 #include "msmpeg4.h"
46 #include "qpeldsp.h"
47 #include "thread.h"
48 #include "wmv2.h"
49 
51 {
52  /* MPEG-4 Studio Profile only, not supported by hardware */
53  if (avctx->bits_per_raw_sample > 8) {
54  av_assert1(((MpegEncContext *)avctx->priv_data)->studio_profile);
55  return avctx->pix_fmt;
56  }
57 
58  if (avctx->codec->id == AV_CODEC_ID_MSS2)
59  return AV_PIX_FMT_YUV420P;
60 
61  if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) {
64  return AV_PIX_FMT_GRAY8;
65  }
66 
67  return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
68 }
69 
71 {
72  MpegEncContext *s = avctx->priv_data;
73  int ret;
74 
75  s->out_format = FMT_H263;
76 
77  // set defaults
78  ff_mpv_decode_init(s, avctx);
79 
80  s->quant_precision = 5;
82  s->low_delay = 1;
83  s->unrestricted_mv = 1;
84 
85  /* select sub codec */
86  switch (avctx->codec->id) {
87  case AV_CODEC_ID_H263:
88  case AV_CODEC_ID_H263P:
89  s->unrestricted_mv = 0;
91  break;
92  case AV_CODEC_ID_MPEG4:
93  break;
95  s->h263_pred = 1;
96  s->msmpeg4_version = 1;
97  break;
99  s->h263_pred = 1;
100  s->msmpeg4_version = 2;
101  break;
103  s->h263_pred = 1;
104  s->msmpeg4_version = 3;
105  break;
106  case AV_CODEC_ID_WMV1:
107  s->h263_pred = 1;
108  s->msmpeg4_version = 4;
109  break;
110  case AV_CODEC_ID_WMV2:
111  s->h263_pred = 1;
112  s->msmpeg4_version = 5;
113  break;
114  case AV_CODEC_ID_VC1:
115  case AV_CODEC_ID_WMV3:
118  case AV_CODEC_ID_MSS2:
119  s->h263_pred = 1;
120  s->msmpeg4_version = 6;
122  break;
123  case AV_CODEC_ID_H263I:
124  break;
125  case AV_CODEC_ID_FLV1:
126  s->h263_flv = 1;
127  break;
128  default:
129  av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
130  avctx->codec->id);
131  return AVERROR(ENOSYS);
132  }
133  s->codec_id = avctx->codec->id;
134 
135  if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
136  if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
137  s->ehc_mode = 1;
138 
139  /* for H.263, we allocate the images after having read the header */
140  if (avctx->codec->id != AV_CODEC_ID_H263 &&
141  avctx->codec->id != AV_CODEC_ID_H263P &&
142  avctx->codec->id != AV_CODEC_ID_MPEG4) {
143  avctx->pix_fmt = h263_get_format(avctx);
144  ff_mpv_idct_init(s);
145  if ((ret = ff_mpv_common_init(s)) < 0)
146  return ret;
147  }
148 
150  ff_qpeldsp_init(&s->qdsp);
152 
153  return 0;
154 }
155 
157 {
158  MpegEncContext *s = avctx->priv_data;
159 
161  return 0;
162 }
163 
164 /**
165  * Return the number of bytes consumed for building the current frame.
166  */
167 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
168 {
169  int pos = (get_bits_count(&s->gb) + 7) >> 3;
170 
171  if (s->divx_packed || s->avctx->hwaccel) {
172  /* We would have to scan through the whole buf to handle the weird
173  * reordering ... */
174  return buf_size;
175  } else if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
176  pos -= s->parse_context.last_index;
177  // padding is not really read so this might be -1
178  if (pos < 0)
179  pos = 0;
180  return pos;
181  } else {
182  // avoid infinite loops (maybe not needed...)
183  if (pos == 0)
184  pos = 1;
185  // oops ;)
186  if (pos + 10 > buf_size)
187  pos = buf_size;
188 
189  return pos;
190  }
191 }
192 
194 {
195  const int part_mask = s->partitioned_frame
196  ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
197  const int mb_size = 16 >> s->avctx->lowres;
198  int ret;
199 
200  s->last_resync_gb = s->gb;
201  s->first_slice_line = 1;
202  s->resync_mb_x = s->mb_x;
203  s->resync_mb_y = s->mb_y;
204 
205  ff_set_qscale(s, s->qscale);
206 
207  if (s->studio_profile) {
209  return ret;
210  }
211 
212  if (s->avctx->hwaccel) {
213  const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
214  ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
215  // ensure we exit decode loop
216  s->mb_y = s->mb_height;
217  return ret;
218  }
219 
220  if (s->partitioned_frame) {
221  const int qscale = s->qscale;
222 
223  if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
224  if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
225  return ret;
226 
227  /* restore variables which were modified */
228  s->first_slice_line = 1;
229  s->mb_x = s->resync_mb_x;
230  s->mb_y = s->resync_mb_y;
231  ff_set_qscale(s, qscale);
232  }
233 
234  for (; s->mb_y < s->mb_height; s->mb_y++) {
235  /* per-row end of slice checks */
236  if (s->msmpeg4_version) {
237  if (s->resync_mb_y + s->slice_height == s->mb_y) {
239  s->mb_x - 1, s->mb_y, ER_MB_END);
240 
241  return 0;
242  }
243  }
244 
245  if (s->msmpeg4_version == 1) {
246  s->last_dc[0] =
247  s->last_dc[1] =
248  s->last_dc[2] = 128;
249  }
250 
252  for (; s->mb_x < s->mb_width; s->mb_x++) {
253  int ret;
254 
256 
257  if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
258  s->first_slice_line = 0;
259 
260  /* DCT & quantize */
261 
262  s->mv_dir = MV_DIR_FORWARD;
263  s->mv_type = MV_TYPE_16X16;
264  ff_dlog(s, "%d %06X\n",
265  get_bits_count(&s->gb), show_bits(&s->gb, 24));
266 
267  ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
268  ret = s->decode_mb(s, s->block);
269 
270  if (s->pict_type != AV_PICTURE_TYPE_B)
272 
273  if (ret < 0) {
274  const int xy = s->mb_x + s->mb_y * s->mb_stride;
275  if (ret == SLICE_END) {
277  if (s->loop_filter)
279 
281  s->mb_x, s->mb_y, ER_MB_END & part_mask);
282 
283  s->padding_bug_score--;
284 
285  if (++s->mb_x >= s->mb_width) {
286  s->mb_x = 0;
287  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
289  s->mb_y++;
290  }
291  return 0;
292  } else if (ret == SLICE_NOEND) {
294  "Slice mismatch at MB: %d\n", xy);
296  s->mb_x + 1, s->mb_y,
297  ER_MB_END & part_mask);
298  return AVERROR_INVALIDDATA;
299  }
300  av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
302  s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
303 
305  continue;
306  return AVERROR_INVALIDDATA;
307  }
308 
310  if (s->loop_filter)
312  }
313 
314  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
316 
317  s->mb_x = 0;
318  }
319 
320  av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
321 
322  // Detect incorrect padding with wrong stuffing codes used by NEC N-02B
323  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
325  get_bits_left(&s->gb) >= 48 &&
326  show_bits(&s->gb, 24) == 0x4010 &&
327  !s->data_partitioning)
328  s->padding_bug_score += 32;
329 
330  /* try to detect the padding bug */
331  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
333  get_bits_left(&s->gb) >= 0 &&
334  get_bits_left(&s->gb) < 137 &&
335  !s->data_partitioning) {
336  const int bits_count = get_bits_count(&s->gb);
337  const int bits_left = s->gb.size_in_bits - bits_count;
338 
339  if (bits_left == 0) {
340  s->padding_bug_score += 16;
341  } else if (bits_left != 1) {
342  int v = show_bits(&s->gb, 8);
343  v |= 0x7F >> (7 - (bits_count & 7));
344 
345  if (v == 0x7F && bits_left <= 8)
346  s->padding_bug_score--;
347  else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
348  bits_left <= 16)
349  s->padding_bug_score += 4;
350  else
351  s->padding_bug_score++;
352  }
353  }
354 
355  if (s->codec_id == AV_CODEC_ID_H263 &&
357  get_bits_left(&s->gb) >= 8 &&
358  get_bits_left(&s->gb) < 300 &&
360  show_bits(&s->gb, 8) == 0 &&
361  !s->data_partitioning) {
362 
363  s->padding_bug_score += 32;
364  }
365 
366  if (s->codec_id == AV_CODEC_ID_H263 &&
368  get_bits_left(&s->gb) >= 64 &&
369  AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
370 
371  s->padding_bug_score += 32;
372  }
373 
375  if (
376  (s->padding_bug_score > -2 && !s->data_partitioning))
378  else
380  }
381 
382  // handle formats which don't have unique end markers
383  if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
384  int left = get_bits_left(&s->gb);
385  int max_extra = 7;
386 
387  /* no markers in M$ crap */
389  max_extra += 17;
390 
391  /* buggy padding but the frame should still end approximately at
392  * the bitstream end */
393  if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
395  max_extra += 48;
396  else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
397  max_extra += 256 * 256 * 256 * 64;
398 
399  if (left > max_extra)
401  "discarding %d junk bits at end, next would be %X\n",
402  left, show_bits(&s->gb, 24));
403  else if (left < 0)
404  av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
405  else
407  s->mb_x - 1, s->mb_y, ER_MB_END);
408 
409  return 0;
410  }
411 
413  "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
414  get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
415 
416  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
417  ER_MB_END & part_mask);
418 
419  return AVERROR_INVALIDDATA;
420 }
421 
422 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
423  AVPacket *avpkt)
424 {
425  const uint8_t *buf = avpkt->data;
426  int buf_size = avpkt->size;
427  MpegEncContext *s = avctx->priv_data;
428  int ret;
429  int slice_ret = 0;
430  AVFrame *pict = data;
431 
432  /* no supplementary picture */
433  if (buf_size == 0) {
434  /* special case for last picture */
435  if (s->low_delay == 0 && s->next_picture_ptr) {
436  if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
437  return ret;
438  s->next_picture_ptr = NULL;
439 
440  *got_frame = 1;
441  }
442 
443  return 0;
444  }
445 
446  if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
447  int next;
448 
449  if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
450  next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
451  } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
452  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
453  } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
454  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
455  } else {
457  "this codec does not support truncated bitstreams\n");
458  return AVERROR(ENOSYS);
459  }
460 
461  if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
462  &buf_size) < 0)
463  return buf_size;
464  }
465 
466 retry:
467  if (s->divx_packed && s->bitstream_buffer_size) {
468  int i;
469  for(i=0; i < buf_size-3; i++) {
470  if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
471  if (buf[i+3]==0xB0) {
472  av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
473  s->bitstream_buffer_size = 0;
474  }
475  break;
476  }
477  }
478  }
479 
480  if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder
481  ret = init_get_bits8(&s->gb, s->bitstream_buffer,
483  else
484  ret = init_get_bits8(&s->gb, buf, buf_size);
485 
486  s->bitstream_buffer_size = 0;
487  if (ret < 0)
488  return ret;
489 
490  if (!s->context_initialized)
491  // we need the idct permutation for reading a custom matrix
492  ff_mpv_idct_init(s);
493 
494  /* let's go :-) */
495  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
497  } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
499  } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
500  if (s->avctx->extradata_size && s->picture_number == 0) {
501  GetBitContext gb;
502 
503  if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
505  }
506  ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb, 0);
507  } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
509  } else if (CONFIG_FLV_DECODER && s->h263_flv) {
511  } else {
513  }
514 
515  if (ret < 0 || ret == FRAME_SKIPPED) {
516  if ( s->width != avctx->coded_width
517  || s->height != avctx->coded_height) {
518  av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
519  s->width = avctx->coded_width;
520  s->height= avctx->coded_height;
521  }
522  }
523  if (ret == FRAME_SKIPPED)
524  return get_consumed_bytes(s, buf_size);
525 
526  /* skip if the header was thrashed */
527  if (ret < 0) {
528  av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
529  return ret;
530  }
531 
532  if (!s->context_initialized) {
533  avctx->pix_fmt = h263_get_format(avctx);
534  if ((ret = ff_mpv_common_init(s)) < 0)
535  return ret;
536  }
537 
538  if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
539  int i = ff_find_unused_picture(s->avctx, s->picture, 0);
540  if (i < 0)
541  return i;
542  s->current_picture_ptr = &s->picture[i];
543  }
544 
545  avctx->has_b_frames = !s->low_delay;
546 
547  if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
548  if (ff_mpeg4_workaround_bugs(avctx) == 1)
549  goto retry;
550  if (s->studio_profile != (s->idsp.idct == NULL))
551  ff_mpv_idct_init(s);
552  }
553 
554  /* After H.263 & MPEG-4 header decode we have the height, width,
555  * and other parameters. So then we could init the picture.
556  * FIXME: By the way H.263 decoder is evolving it should have
557  * an H263EncContext */
558  if (s->width != avctx->coded_width ||
559  s->height != avctx->coded_height ||
560  s->context_reinit) {
561  /* H.263 could change picture size any time */
562  s->context_reinit = 0;
563 
564  ret = ff_set_dimensions(avctx, s->width, s->height);
565  if (ret < 0)
566  return ret;
567 
568  ff_set_sar(avctx, avctx->sample_aspect_ratio);
569 
570  if ((ret = ff_mpv_common_frame_size_change(s)))
571  return ret;
572 
573  if (avctx->pix_fmt != h263_get_format(avctx)) {
574  av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
575  avctx->pix_fmt = AV_PIX_FMT_NONE;
576  return AVERROR_UNKNOWN;
577  }
578  }
579 
580  if (s->codec_id == AV_CODEC_ID_H263 ||
581  s->codec_id == AV_CODEC_ID_H263P ||
584 
585  // for skipping the frame
588 
589  /* skip B-frames if we don't have reference frames */
590  if (!s->last_picture_ptr &&
591  (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
592  return get_consumed_bytes(s, buf_size);
593  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
594  s->pict_type == AV_PICTURE_TYPE_B) ||
595  (avctx->skip_frame >= AVDISCARD_NONKEY &&
596  s->pict_type != AV_PICTURE_TYPE_I) ||
597  avctx->skip_frame >= AVDISCARD_ALL)
598  return get_consumed_bytes(s, buf_size);
599 
600  if (s->next_p_frame_damaged) {
601  if (s->pict_type == AV_PICTURE_TYPE_B)
602  return get_consumed_bytes(s, buf_size);
603  else
604  s->next_p_frame_damaged = 0;
605  }
606 
607  if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
610  } else {
613  }
614 
615  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
616  return ret;
617 
618  if (!s->divx_packed && !avctx->hwaccel)
619  ff_thread_finish_setup(avctx);
620 
621  if (avctx->hwaccel) {
622  ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
623  s->gb.buffer_end - s->gb.buffer);
624  if (ret < 0 )
625  return ret;
626  }
627 
629 
630  /* the second part of the wmv2 header contains the MB skip bits which
631  * are stored in current_picture->mb_type which is not available before
632  * ff_mpv_frame_start() */
633  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
635  if (ret < 0)
636  return ret;
637  if (ret == 1)
638  goto frame_end;
639  }
640 
641  /* decode each macroblock */
642  s->mb_x = 0;
643  s->mb_y = 0;
644 
645  slice_ret = decode_slice(s);
646  while (s->mb_y < s->mb_height) {
647  if (s->msmpeg4_version) {
648  if (s->slice_height == 0 || s->mb_x != 0 || slice_ret < 0 ||
649  (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
650  break;
651  } else {
652  int prev_x = s->mb_x, prev_y = s->mb_y;
653  if (ff_h263_resync(s) < 0)
654  break;
655  if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
656  s->er.error_occurred = 1;
657  }
658 
659  if (s->msmpeg4_version < 4 && s->h263_pred)
661 
662  if (decode_slice(s) < 0)
663  slice_ret = AVERROR_INVALIDDATA;
664  }
665 
666  if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
668  if (!CONFIG_MSMPEG4_DECODER ||
669  ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
671 
673 frame_end:
674  if (!s->studio_profile)
675  ff_er_frame_end(&s->er);
676 
677  if (avctx->hwaccel) {
678  ret = avctx->hwaccel->end_frame(avctx);
679  if (ret < 0)
680  return ret;
681  }
682 
683  ff_mpv_frame_end(s);
684 
685  if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
686  ff_mpeg4_frame_end(avctx, buf, buf_size);
687 
688  if (!s->divx_packed && avctx->hwaccel)
689  ff_thread_finish_setup(avctx);
690 
693  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
694  if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
695  return ret;
698  } else if (s->last_picture_ptr) {
699  if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
700  return ret;
703  }
704 
705  if (s->last_picture_ptr || s->low_delay) {
706  if ( pict->format == AV_PIX_FMT_YUV420P
707  && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
708  int x, y, p;
710  for (p=0; p<3; p++) {
711  int w = AV_CEIL_RSHIFT(pict-> width, !!p);
712  int h = AV_CEIL_RSHIFT(pict->height, !!p);
713  int linesize = pict->linesize[p];
714  for (y=0; y<(h>>1); y++)
715  for (x=0; x<w; x++)
716  FFSWAP(int,
717  pict->data[p][x + y*linesize],
718  pict->data[p][x + (h-1-y)*linesize]);
719  }
720  }
721  *got_frame = 1;
722  }
723 
724  if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
725  return slice_ret;
726  else
727  return get_consumed_bytes(s, buf_size);
728 }
729 
731 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
733 #endif
734 #if CONFIG_MPEG4_NVDEC_HWACCEL
736 #endif
737 #if CONFIG_MPEG4_VDPAU_HWACCEL
739 #endif
740 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
742 #endif
745 };
746 
748 #if CONFIG_H263_VAAPI_HWACCEL
749  HWACCEL_VAAPI(h263),
750 #endif
751 #if CONFIG_MPEG4_NVDEC_HWACCEL
752  HWACCEL_NVDEC(mpeg4),
753 #endif
754 #if CONFIG_MPEG4_VDPAU_HWACCEL
755  HWACCEL_VDPAU(mpeg4),
756 #endif
757 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
758  HWACCEL_VIDEOTOOLBOX(h263),
759 #endif
760  NULL
761 };
762 
764  .name = "h263",
765  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
766  .type = AVMEDIA_TYPE_VIDEO,
767  .id = AV_CODEC_ID_H263,
768  .priv_data_size = sizeof(MpegEncContext),
770  .close = ff_h263_decode_end,
775  .flush = ff_mpeg_flush,
776  .max_lowres = 3,
778  .hw_configs = ff_h263_hw_config_list,
779 };
780 
782  .name = "h263p",
783  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
784  .type = AVMEDIA_TYPE_VIDEO,
785  .id = AV_CODEC_ID_H263P,
786  .priv_data_size = sizeof(MpegEncContext),
788  .close = ff_h263_decode_end,
793  .flush = ff_mpeg_flush,
794  .max_lowres = 3,
796  .hw_configs = ff_h263_hw_config_list,
797 };
int bitstream_buffer_size
Definition: mpegvideo.h:418
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:48
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:1656
#define ff_tlog(ctx,...)
Definition: internal.h:86
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:1304
const struct AVCodec * codec
Definition: avcodec.h:540
discard all frames except keyframes
Definition: avcodec.h:235
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2272
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:607
This structure describes decoded (raw) audio or video data.
Definition: frame.h:314
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static void flush(AVCodecContext *avctx)
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:719
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:524
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
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:106
hardware decoding through Videotoolbox
Definition: pixfmt.h:282
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
static int decode_slice(MpegEncContext *s)
Definition: h263dec.c:193
const AVCodecHWConfigInternal *const ff_h263_hw_config_list[]
Definition: h263dec.c:747
void ff_er_frame_end(ERContext *s)
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1166
int msmpeg4_version
0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
Definition: mpegvideo.h:440
av_cold void ff_h263dsp_init(H263DSPContext *ctx)
Definition: h263dsp.c:117
#define HWACCEL_NVDEC(codec)
Definition: hwconfig.h:71
int size
Definition: packet.h:364
uint8_t * bitstream_buffer
Definition: mpegvideo.h:417
enum AVCodecID codec_id
Definition: mpegvideo.h:112
#define AV_EF_BUFFER
detect improper bitstream length
Definition: avcodec.h:1650
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:910
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:741
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
int studio_profile
Definition: mpegvideo.h:386
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size)
Definition: msmpeg4dec.c:560
mpegvideo header.
discard all
Definition: avcodec.h:236
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:1742
int padding_bug_score
used to detect the VERY common padding bug in MPEG-4
Definition: mpegvideo.h:413
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:133
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1675
QpelDSPContext qdsp
Definition: mpegvideo.h:235
AVCodec.
Definition: codec.h:190
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:402
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:696
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:1997
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: codec.h:75
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo.c:2265
int context_reinit
Definition: mpegvideo.h:569
static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
Definition: h263dec.c:50
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:108
uint8_t
#define av_cold
Definition: attributes.h:88
#define HWACCEL_VDPAU(codec)
Definition: hwconfig.h:75
enum OutputFormat out_format
output format
Definition: mpegvideo.h:104
int ff_mpv_common_frame_size_change(MpegEncContext *s)
Definition: mpegvideo.c:1034
#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:632
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:437
quarterpel DSP functions
uint8_t * data
Definition: packet.h:363
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:121
#define ff_dlog(a,...)
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:331
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:1749
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:308
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1173
#define av_log(a,...)
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:750
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2336
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:404
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
enum AVCodecID id
Definition: codec.h:204
H263DSPContext h263dsp
Definition: mpegvideo.h:237
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:821
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:407
AVCodec ff_h263_decoder
Definition: h263dec.c:763
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:115
ERContext er
Definition: mpegvideo.h:571
unsigned int pos
Definition: spdifenc.c:412
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:611
#define FF_BUG_NO_PADDING
Definition: avcodec.h:1571
int(* decode_mb)(struct MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.h:515
const char * name
Name of the codec implementation.
Definition: codec.h:197
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:408
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:73
GetBitContext gb
Definition: mpegvideo.h:453
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1109
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:2305
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: codec.h:44
int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type)
Definition: mpegvideo.c:1425
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: codec.h:211
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:397
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1640
#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:167
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:39
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:781
MotionEstContext me
Definition: mpegvideo.h:282
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1651
#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:422
HW acceleration through CUDA.
Definition: pixfmt.h:235
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:156
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:387
#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:438
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:2492
enum AVCodecID codec_id
Definition: avcodec.h:541
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:345
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:531
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:556
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 ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
Definition: mpegvideo.c:1418
#define SLICE_END
end marker found
Definition: mpegvideo.h:523
Picture * picture
main picture buffer
Definition: mpegvideo.h:136
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:406
int extradata_size
Definition: avcodec.h:633
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
int coded_height
Definition: avcodec.h:719
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:1653
int slice_height
in macroblocks
Definition: mpegvideo.h:437
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:998
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:1186
#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:303
#define AV_CODEC_CAP_TRUNCATED
Definition: codec.h:51
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:1568
int h263_pred
use MPEG-4/H.263 ac/dc predictions
Definition: mpegvideo.h:105
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:70
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
Definition: ituh263dec.c:212
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:2481
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:328
qpel_mc_func(* qpel_avg)[16]
Definition: motion_est.h:92
Narrow or limited range content.
Definition: pixfmt.h:569
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:2453
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:232
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:91
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
Y , 8bpp.
Definition: pixfmt.h:74
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)
Initialize the given MpegEncContext for decoding.
Definition: mpegvideo.c:669
#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:730
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:43
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
void * priv_data
Definition: avcodec.h:558
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:883
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1410
#define HWACCEL_VAAPI(codec)
Definition: hwconfig.h:73
void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:2253
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:513
ParseContext parse_context
Definition: mpegvideo.h:362
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:392
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:317
int height
Definition: frame.h:372
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:608
#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:108
#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:92
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:91
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
This structure stores compressed data.
Definition: packet.h:340
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:2350
#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: codec.h:50
int i
Definition: input.c:407
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58