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 "mpegvideo.h"
39 #include "msmpeg4.h"
40 #include "qpeldsp.h"
41 #include "thread.h"
42 
44 {
45  MpegEncContext *s = avctx->priv_data;
46  int ret;
47 
48  s->avctx = avctx;
49  s->out_format = FMT_H263;
50  s->width = avctx->coded_width;
51  s->height = avctx->coded_height;
52  s->workaround_bugs = avctx->workaround_bugs;
53 
54  // set defaults
56  s->quant_precision = 5;
58  s->low_delay = 1;
59  if (avctx->codec->id == AV_CODEC_ID_MSS2)
60  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
61  else
62  avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
63  s->unrestricted_mv = 1;
64 
65  /* select sub codec */
66  switch (avctx->codec->id) {
67  case AV_CODEC_ID_H263:
68  s->unrestricted_mv = 0;
70  break;
71  case AV_CODEC_ID_MPEG4:
72  break;
74  s->h263_pred = 1;
75  s->msmpeg4_version = 1;
76  break;
78  s->h263_pred = 1;
79  s->msmpeg4_version = 2;
80  break;
82  s->h263_pred = 1;
83  s->msmpeg4_version = 3;
84  break;
85  case AV_CODEC_ID_WMV1:
86  s->h263_pred = 1;
87  s->msmpeg4_version = 4;
88  break;
89  case AV_CODEC_ID_WMV2:
90  s->h263_pred = 1;
91  s->msmpeg4_version = 5;
92  break;
93  case AV_CODEC_ID_VC1:
94  case AV_CODEC_ID_WMV3:
97  case AV_CODEC_ID_MSS2:
98  s->h263_pred = 1;
99  s->msmpeg4_version = 6;
101  break;
102  case AV_CODEC_ID_H263I:
103  break;
104  case AV_CODEC_ID_FLV1:
105  s->h263_flv = 1;
106  break;
107  default:
108  av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
109  avctx->codec->id);
110  return AVERROR(ENOSYS);
111  }
112  s->codec_id = avctx->codec->id;
113 
114  /* for h263, we allocate the images after having read the header */
115  if (avctx->codec->id != AV_CODEC_ID_H263 &&
116  avctx->codec->id != AV_CODEC_ID_MPEG4) {
117  ff_mpv_idct_init(s);
118  if ((ret = ff_mpv_common_init(s)) < 0)
119  return ret;
120  }
121 
123  ff_qpeldsp_init(&s->qdsp);
125 
126  return 0;
127 }
128 
130 {
131  MpegEncContext *s = avctx->priv_data;
132 
134  return 0;
135 }
136 
140 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
141 {
142  int pos = (get_bits_count(&s->gb) + 7) >> 3;
143 
144  if (s->divx_packed || s->avctx->hwaccel) {
145  /* We would have to scan through the whole buf to handle the weird
146  * reordering ... */
147  return buf_size;
148  } else if (s->flags & CODEC_FLAG_TRUNCATED) {
149  pos -= s->parse_context.last_index;
150  // padding is not really read so this might be -1
151  if (pos < 0)
152  pos = 0;
153  return pos;
154  } else {
155  // avoid infinite loops (maybe not needed...)
156  if (pos == 0)
157  pos = 1;
158  // oops ;)
159  if (pos + 10 > buf_size)
160  pos = buf_size;
161 
162  return pos;
163  }
164 }
165 
167 {
168  const int part_mask = s->partitioned_frame
169  ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
170  const int mb_size = 16;
171  int ret;
172 
173  s->last_resync_gb = s->gb;
174  s->first_slice_line = 1;
175  s->resync_mb_x = s->mb_x;
176  s->resync_mb_y = s->mb_y;
177 
178  ff_set_qscale(s, s->qscale);
179 
180  if (s->avctx->hwaccel) {
181  const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
182  const uint8_t *end = ff_h263_find_resync_marker(start + 1,
183  s->gb.buffer_end);
184  skip_bits_long(&s->gb, 8 * (end - start));
185  return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
186  }
187 
188  if (s->partitioned_frame) {
189  const int qscale = s->qscale;
190 
192  if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
193  return ret;
194 
195  /* restore variables which were modified */
196  s->first_slice_line = 1;
197  s->mb_x = s->resync_mb_x;
198  s->mb_y = s->resync_mb_y;
199  ff_set_qscale(s, qscale);
200  }
201 
202  for (; s->mb_y < s->mb_height; s->mb_y++) {
203  /* per-row end of slice checks */
204  if (s->msmpeg4_version) {
205  if (s->resync_mb_y + s->slice_height == s->mb_y) {
207  s->mb_x - 1, s->mb_y, ER_MB_END);
208 
209  return 0;
210  }
211  }
212 
213  if (s->msmpeg4_version == 1) {
214  s->last_dc[0] =
215  s->last_dc[1] =
216  s->last_dc[2] = 128;
217  }
218 
220  for (; s->mb_x < s->mb_width; s->mb_x++) {
221  int ret;
222 
224 
225  if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
226  s->first_slice_line = 0;
227 
228  /* DCT & quantize */
229 
230  s->mv_dir = MV_DIR_FORWARD;
231  s->mv_type = MV_TYPE_16X16;
232  av_dlog(s, "%d %d %06X\n",
233  ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
234  ret = s->decode_mb(s, s->block);
235 
236  if (s->pict_type != AV_PICTURE_TYPE_B)
238 
239  if (ret < 0) {
240  const int xy = s->mb_x + s->mb_y * s->mb_stride;
241  if (ret == SLICE_END) {
242  ff_mpv_decode_mb(s, s->block);
243  if (s->loop_filter)
245 
247  s->mb_x, s->mb_y, ER_MB_END & part_mask);
248 
249  s->padding_bug_score--;
250 
251  if (++s->mb_x >= s->mb_width) {
252  s->mb_x = 0;
253  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
255  s->mb_y++;
256  }
257  return 0;
258  } else if (ret == SLICE_NOEND) {
260  "Slice mismatch at MB: %d\n", xy);
262  s->mb_x + 1, s->mb_y,
263  ER_MB_END & part_mask);
264  return AVERROR_INVALIDDATA;
265  }
266  av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
268  s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
269 
270  return AVERROR_INVALIDDATA;
271  }
272 
273  ff_mpv_decode_mb(s, s->block);
274  if (s->loop_filter)
276  }
277 
278  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
280 
281  s->mb_x = 0;
282  }
283 
284  assert(s->mb_x == 0 && s->mb_y == s->mb_height);
285 
286  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
288  get_bits_left(&s->gb) >= 48 &&
289  show_bits(&s->gb, 24) == 0x4010 &&
290  !s->data_partitioning)
291  s->padding_bug_score += 32;
292 
293  /* try to detect the padding bug */
294  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
296  get_bits_left(&s->gb) >= 0 &&
297  get_bits_left(&s->gb) < 48 &&
298  !s->data_partitioning) {
299  const int bits_count = get_bits_count(&s->gb);
300  const int bits_left = s->gb.size_in_bits - bits_count;
301 
302  if (bits_left == 0) {
303  s->padding_bug_score += 16;
304  } else if (bits_left != 1) {
305  int v = show_bits(&s->gb, 8);
306  v |= 0x7F >> (7 - (bits_count & 7));
307 
308  if (v == 0x7F && bits_left <= 8)
309  s->padding_bug_score--;
310  else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
311  bits_left <= 16)
312  s->padding_bug_score += 4;
313  else
314  s->padding_bug_score++;
315  }
316  }
317 
319  if (s->padding_bug_score > -2 && !s->data_partitioning)
321  else
323  }
324 
325  // handle formats which don't have unique end markers
326  if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
327  int left = get_bits_left(&s->gb);
328  int max_extra = 7;
329 
330  /* no markers in M$ crap */
332  max_extra += 17;
333 
334  /* buggy padding but the frame should still end approximately at
335  * the bitstream end */
336  if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
338  max_extra += 48;
339  else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
340  max_extra += 256 * 256 * 256 * 64;
341 
342  if (left > max_extra)
344  "discarding %d junk bits at end, next would be %X\n",
345  left, show_bits(&s->gb, 24));
346  else if (left < 0)
347  av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
348  else
350  s->mb_x - 1, s->mb_y, ER_MB_END);
351 
352  return 0;
353  }
354 
356  "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
357  get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
358 
359  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
360  ER_MB_END & part_mask);
361 
362  return AVERROR_INVALIDDATA;
363 }
364 
365 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
366  AVPacket *avpkt)
367 {
368  const uint8_t *buf = avpkt->data;
369  int buf_size = avpkt->size;
370  MpegEncContext *s = avctx->priv_data;
371  int ret;
372  AVFrame *pict = data;
373 
374  s->flags = avctx->flags;
375  s->flags2 = avctx->flags2;
376 
377  /* no supplementary picture */
378  if (buf_size == 0) {
379  /* special case for last picture */
380  if (s->low_delay == 0 && s->next_picture_ptr) {
381  if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
382  return ret;
383  s->next_picture_ptr = NULL;
384 
385  *got_frame = 1;
386  }
387 
388  return 0;
389  }
390 
391  if (s->flags & CODEC_FLAG_TRUNCATED) {
392  int next;
393 
395  next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
396  } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
397  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
398  } else {
400  "this codec does not support truncated bitstreams\n");
401  return AVERROR(ENOSYS);
402  }
403 
404  if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
405  &buf_size) < 0)
406  return buf_size;
407  }
408 
409  if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder
410  ret = init_get_bits8(&s->gb, s->bitstream_buffer,
412  else
413  ret = init_get_bits8(&s->gb, buf, buf_size);
414  s->bitstream_buffer_size = 0;
415 
416  if (ret < 0)
417  return ret;
418 
419  if (!s->context_initialized)
420  // we need the idct permutaton for reading a custom matrix
421  ff_mpv_idct_init(s);
422 
423  /* let's go :-) */
424  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
426  } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
428  } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
429  if (s->avctx->extradata_size && s->picture_number == 0) {
430  GetBitContext gb;
431 
432  ret = init_get_bits8(&gb, s->avctx->extradata,
433  s->avctx->extradata_size);
434  if (ret < 0)
435  return ret;
437  }
438  ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
439  } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
441  } else if (CONFIG_FLV_DECODER && s->h263_flv) {
443  } else {
445  }
446 
447  if (ret == FRAME_SKIPPED)
448  return get_consumed_bytes(s, buf_size);
449 
450  /* skip if the header was thrashed */
451  if (ret < 0) {
452  av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
453  return ret;
454  }
455 
456  if (!s->context_initialized)
457  if ((ret = ff_mpv_common_init(s)) < 0)
458  return ret;
459 
460  if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
461  int i = ff_find_unused_picture(s, 0);
462  if (i < 0)
463  return i;
464  s->current_picture_ptr = &s->picture[i];
465  }
466 
467  avctx->has_b_frames = !s->low_delay;
468 
469 #define SET_QPEL_FUNC(postfix1, postfix2) \
470  s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
471  s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
472  s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
473 
474  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
475  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
476  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
477  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
478  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
479  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
480  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
481 
482  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
483  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
484  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
485  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
486  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
487  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
488  }
489 
490  /* After H263 & mpeg4 header decode we have the height, width,
491  * and other parameters. So then we could init the picture.
492  * FIXME: By the way H263 decoder is evolving it should have
493  * an H263EncContext */
494  if (s->width != avctx->coded_width ||
495  s->height != avctx->coded_height ||
496  s->context_reinit) {
497  /* H.263 could change picture size any time */
498  s->context_reinit = 0;
499 
500  ret = ff_set_dimensions(avctx, s->width, s->height);
501  if (ret < 0)
502  return ret;
503 
504  ff_set_sar(avctx, avctx->sample_aspect_ratio);
505 
506  if ((ret = ff_mpv_common_frame_size_change(s)))
507  return ret;
508  }
509 
510  if (s->codec_id == AV_CODEC_ID_H263 ||
511  s->codec_id == AV_CODEC_ID_H263P ||
514 
515  // for skipping the frame
518 
519  /* skip B-frames if we don't have reference frames */
520  if (!s->last_picture_ptr &&
521  (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
522  return get_consumed_bytes(s, buf_size);
523  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
524  s->pict_type == AV_PICTURE_TYPE_B) ||
525  (avctx->skip_frame >= AVDISCARD_NONKEY &&
526  s->pict_type != AV_PICTURE_TYPE_I) ||
527  avctx->skip_frame >= AVDISCARD_ALL)
528  return get_consumed_bytes(s, buf_size);
529 
530  if (s->next_p_frame_damaged) {
531  if (s->pict_type == AV_PICTURE_TYPE_B)
532  return get_consumed_bytes(s, buf_size);
533  else
534  s->next_p_frame_damaged = 0;
535  }
536 
537  if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
540  } else {
543  }
544 
545  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
546  return ret;
547 
548  if (!s->divx_packed && !avctx->hwaccel)
549  ff_thread_finish_setup(avctx);
550 
551  if (avctx->hwaccel) {
552  ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
553  s->gb.buffer_end - s->gb.buffer);
554  if (ret < 0 )
555  return ret;
556  }
557 
559 
560  /* the second part of the wmv2 header contains the MB skip bits which
561  * are stored in current_picture->mb_type which is not available before
562  * ff_mpv_frame_start() */
563  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
565  if (ret < 0)
566  return ret;
567  if (ret == 1)
568  goto intrax8_decoded;
569  }
570 
571  /* decode each macroblock */
572  s->mb_x = 0;
573  s->mb_y = 0;
574 
575  ret = decode_slice(s);
576  while (s->mb_y < s->mb_height) {
577  if (s->msmpeg4_version) {
578  if (s->slice_height == 0 || s->mb_x != 0 ||
579  (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
580  break;
581  } else {
582  int prev_x = s->mb_x, prev_y = s->mb_y;
583  if (ff_h263_resync(s) < 0)
584  break;
585  if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
586  s->er.error_occurred = 1;
587  }
588 
589  if (s->msmpeg4_version < 4 && s->h263_pred)
591 
592  if (decode_slice(s) < 0)
593  ret = AVERROR_INVALIDDATA;
594  }
595 
596  if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
598  if (!CONFIG_MSMPEG4_DECODER ||
599  ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
601 
602  assert(s->bitstream_buffer_size == 0);
603 
605  ff_mpeg4_frame_end(avctx, buf, buf_size);
606 
607 intrax8_decoded:
608  ff_er_frame_end(&s->er);
609 
610  if (avctx->hwaccel) {
611  ret = avctx->hwaccel->end_frame(avctx);
612  if (ret < 0)
613  return ret;
614  }
615 
616  ff_mpv_frame_end(s);
617 
618  if (!s->divx_packed && avctx->hwaccel)
619  ff_thread_finish_setup(avctx);
620 
621  assert(s->current_picture.f->pict_type ==
623  assert(s->current_picture.f->pict_type == s->pict_type);
624  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
625  if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
626  return ret;
628  } else if (s->last_picture_ptr) {
629  if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
630  return ret;
632  }
633 
634  if (s->last_picture_ptr || s->low_delay)
635  *got_frame = 1;
636 
637  if (ret && (avctx->err_recognition & AV_EF_EXPLODE))
638  return ret;
639  else
640  return get_consumed_bytes(s, buf_size);
641 }
642 
644 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
646 #endif
647 #if CONFIG_H263_VDPAU_HWACCEL || CONFIG_MPEG4_VDPAU_HWACCEL
649 #endif
652 };
653 
655  .name = "h263",
656  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
657  .type = AVMEDIA_TYPE_VIDEO,
658  .id = AV_CODEC_ID_H263,
659  .priv_data_size = sizeof(MpegEncContext),
663  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
665  .flush = ff_mpeg_flush,
667 };
int bitstream_buffer_size
Definition: mpegvideo.h:529
const struct AVCodec * codec
Definition: avcodec.h:1059
discard all frames except keyframes
Definition: avcodec.h:567
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2442
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:2972
qpel_mc_func avg_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:74
int picture_number
Definition: mpegvideo.h:253
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
mpeg2/4, h264 default
Definition: pixfmt.h:378
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1244
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:606
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:133
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:199
static int decode_slice(MpegEncContext *s)
Definition: h263dec.c:166
#define CODEC_CAP_TRUNCATED
Definition: avcodec.h:685
#define CONFIG_FLV_DECODER
Definition: config.h:508
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:548
av_cold void ff_h263dsp_init(H263DSPContext *ctx)
Definition: h263dsp.c:117
int size
Definition: avcodec.h:974
uint8_t * bitstream_buffer
Definition: mpegvideo.h:528
enum AVCodecID codec_id
Definition: mpegvideo.h:235
#define AV_EF_BUFFER
Definition: avcodec.h:2432
HW decoding through VA API, Picture.data[3] contains a vaapi_render_state struct which contains the b...
Definition: pixfmt.h:127
const uint8_t * buffer
Definition: get_bits.h:54
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:1445
void ff_print_debug_info(MpegEncContext *s, Picture *p)
Print debugging info for the given picture.
Definition: mpegvideo.c:1984
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1270
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
mpegvideo header.
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
discard all
Definition: avcodec.h:568
int padding_bug_score
used to detect the VERY common padding bug in MPEG4
Definition: mpegvideo.h:524
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:259
QpelDSPContext qdsp
Definition: mpegvideo.h:359
AVCodec.
Definition: avcodec.h:2812
int qscale
QP.
Definition: mpegvideo.h:332
int quant_precision
Definition: mpegvideo.h:513
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:600
enum AVDiscard skip_frame
Definition: avcodec.h:2743
void ff_mpeg4_clean_buffers(MpegEncContext *s)
Definition: mpeg4video.c:45
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2448
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo.c:2435
int context_reinit
Definition: mpegvideo.h:636
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:103
uint8_t
#define av_cold
Definition: attributes.h:66
enum OutputFormat out_format
output format
Definition: mpegvideo.h:227
int ff_mpv_common_frame_size_change(MpegEncContext *s)
Definition: mpegvideo.c:1479
Multithreading support functions.
#define ER_MB_ERROR
qpel_mc_func(* qpel_put)[16]
Definition: mpegvideo.h:191
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:188
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1164
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:406
void ff_mpv_decode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:2425
int ff_intel_h263_decode_picture_header(MpegEncContext *s)
Definition: intelh263dec.c:25
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:306
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:474
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
quarterpel DSP functions
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:973
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2336
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
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:145
int flags2
AVCodecContext.flags2.
Definition: mpegvideo.h:239
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:408
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:255
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...
int ff_wmv2_decode_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:114
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1789
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:756
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2533
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:555
enum AVCodecID id
Definition: avcodec.h:2826
H263DSPContext h263dsp
Definition: mpegvideo.h:361
#define CODEC_FLAG_TRUNCATED
Definition: avcodec.h:646
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1355
int last_dc[3]
last DC values for MPEG1
Definition: mpegvideo.h:311
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
#define CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:713
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:217
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:518
#define AVERROR(e)
Definition: error.h:43
AVCodec ff_h263_decoder
Definition: h263dec.c:654
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:348
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
ERContext er
Definition: mpegvideo.h:638
int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:134
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1144
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2330
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
const char * name
Name of the codec implementation.
Definition: avcodec.h:2819
#define CONFIG_WMV2_DECODER
Definition: config.h:628
int low_delay
no reordering needed / has no b-frames
Definition: mpegvideo.h:519
#define CONFIG_MPEG4_DECODER
Definition: config.h:545
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:73
GetBitContext gb
Definition: mpegvideo.h:558
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:602
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1552
int ff_flv_decode_picture_header(MpegEncContext *s)
Definition: flvdec.c:37
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2503
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:472
uint8_t * error_status_table
#define ER_AC_ERROR
void ff_h263_loop_filter(MpegEncContext *s)
Definition: h263.c:139
int err_recognition
Definition: mpegvideo.h:477
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:2833
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:196
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2422
#define CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:678
int ff_h263_get_gob_height(MpegEncContext *s)
Get the GOB height based on picture height.
Definition: h263.c:375
static int get_consumed_bytes(MpegEncContext *s, int buf_size)
Return the number of bytes consumed for building the current frame.
Definition: h263dec.c:140
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:476
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:310
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:45
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode mpeg4 headers.
int size_in_bits
Definition: get_bits.h:56
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:254
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size)
Definition: msmpeg4dec.c:544
MotionEstContext me
Definition: mpegvideo.h:404
#define AV_EF_EXPLODE
Definition: avcodec.h:2433
#define SET_QPEL_FUNC(postfix1, postfix2)
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:365
void ff_mpv_decode_defaults(MpegEncContext *s)
Set the given MpegEncContext to defaults for decoding.
Definition: mpegvideo.c:1050
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:129
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
Definition: utils.c:914
#define CONFIG_H263I_DECODER
Definition: config.h:516
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:388
int first_slice_line
used in mpeg4 too to handle resync markers
Definition: mpegvideo.h:546
NULL
Definition: eval.c:55
Libavcodec external API header.
void ff_h263_update_motion_val(MpegEncContext *s)
Definition: h263.c:46
int h263_flv
use flv h263 header
Definition: mpegvideo.h:233
enum AVCodecID codec_id
Definition: avcodec.h:1067
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:408
main external API structure.
Definition: avcodec.h:1050
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:223
#define CONFIG_H263_DECODER
Definition: config.h:515
#define SLICE_END
end marker found
Definition: mpegvideo.h:605
Picture * picture
main picture buffer
Definition: mpegvideo.h:262
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:517
int extradata_size
Definition: avcodec.h:1165
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
int coded_height
Definition: avcodec.h:1244
struct AVFrame * f
Definition: mpegvideo.h:100
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: pixfmt.h:190
int context_initialized
Definition: mpegvideo.h:250
int slice_height
in macroblocks
Definition: mpegvideo.h:545
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:868
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:1751
#define MV_DIR_FORWARD
Definition: mpegvideo.h:384
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:339
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2324
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:228
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:43
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:229
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
qpel_mc_func(* qpel_avg)[16]
Definition: mpegvideo.h:192
MpegEncContext.
Definition: mpegvideo.h:204
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:309
struct AVCodecContext * avctx
Definition: mpegvideo.h:221
discard all non reference
Definition: avcodec.h:565
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
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:256
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:54
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:643
Picture * last_picture_ptr
pointer to the previous picture.
Definition: mpegvideo.h:308
Bi-dir predicted.
Definition: avutil.h:255
int workaround_bugs
Work around bugs in encoders which sometimes cannot be detected automatically.
Definition: avcodec.h:2323
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1092
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:1311
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1963
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:473
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:600
ParseContext parse_context
Definition: mpegvideo.h:479
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:191
int flags2
CODEC_FLAG2_*.
Definition: avcodec.h:1151
int flags
AVCodecContext.flags (HQ, MV4, ...)
Definition: mpegvideo.h:238
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:244
#define FRAME_SKIPPED
return value for header parsers if frame is not coded
Definition: mpegvideo.h:54
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:389
mpeg1, jpeg, h263
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:59
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:2985
int ff_find_unused_picture(MpegEncContext *s, int shared)
Definition: mpegvideo.c:1733
int ff_h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
Definition: h263_parser.c:30
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:2996
AVPixelFormat
Pixel format.
Definition: pixfmt.h:63
This structure stores compressed data.
Definition: avcodec.h:950
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:2547