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h263dec.c
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1 /*
2  * H.263 decoder
3  * Copyright (c) 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * H.263 decoder.
26  */
27 
28 #define UNCHECKED_BITSTREAM_READER 1
29 
30 #include "libavutil/cpu.h"
31 #include "avcodec.h"
32 #include "error_resilience.h"
33 #include "flv.h"
34 #include "h263.h"
35 #include "h263_parser.h"
36 #include "internal.h"
37 #include "mpeg_er.h"
38 #include "mpeg4video.h"
39 #include "mpeg4video_parser.h"
40 #include "mpegutils.h"
41 #include "mpegvideo.h"
42 #include "msmpeg4.h"
43 #include "qpeldsp.h"
44 #include "thread.h"
45 #include "wmv2.h"
46 
48 {
49  if (avctx->codec->id == AV_CODEC_ID_MSS2)
50  return AV_PIX_FMT_YUV420P;
51 
52  if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) {
55  return AV_PIX_FMT_GRAY8;
56  }
57 
58  return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
59 }
60 
62 {
63  MpegEncContext *s = avctx->priv_data;
64  int ret;
65 
66  s->out_format = FMT_H263;
67 
68  // set defaults
70  ff_mpv_decode_init(s, avctx);
71 
72  s->quant_precision = 5;
74  s->low_delay = 1;
75  s->unrestricted_mv = 1;
76 
77  /* select sub codec */
78  switch (avctx->codec->id) {
79  case AV_CODEC_ID_H263:
80  case AV_CODEC_ID_H263P:
81  s->unrestricted_mv = 0;
83  break;
84  case AV_CODEC_ID_MPEG4:
85  break;
87  s->h263_pred = 1;
88  s->msmpeg4_version = 1;
89  break;
91  s->h263_pred = 1;
92  s->msmpeg4_version = 2;
93  break;
95  s->h263_pred = 1;
96  s->msmpeg4_version = 3;
97  break;
98  case AV_CODEC_ID_WMV1:
99  s->h263_pred = 1;
100  s->msmpeg4_version = 4;
101  break;
102  case AV_CODEC_ID_WMV2:
103  s->h263_pred = 1;
104  s->msmpeg4_version = 5;
105  break;
106  case AV_CODEC_ID_VC1:
107  case AV_CODEC_ID_WMV3:
110  case AV_CODEC_ID_MSS2:
111  s->h263_pred = 1;
112  s->msmpeg4_version = 6;
114  break;
115  case AV_CODEC_ID_H263I:
116  break;
117  case AV_CODEC_ID_FLV1:
118  s->h263_flv = 1;
119  break;
120  default:
121  av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
122  avctx->codec->id);
123  return AVERROR(ENOSYS);
124  }
125  s->codec_id = avctx->codec->id;
126 
127  if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
128  if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
129  s->ehc_mode = 1;
130 
131  /* for H.263, we allocate the images after having read the header */
132  if (avctx->codec->id != AV_CODEC_ID_H263 &&
133  avctx->codec->id != AV_CODEC_ID_H263P &&
134  avctx->codec->id != AV_CODEC_ID_MPEG4) {
135  avctx->pix_fmt = h263_get_format(avctx);
136  ff_mpv_idct_init(s);
137  if ((ret = ff_mpv_common_init(s)) < 0)
138  return ret;
139  }
140 
142  ff_qpeldsp_init(&s->qdsp);
144 
145  return 0;
146 }
147 
149 {
150  MpegEncContext *s = avctx->priv_data;
151 
153  return 0;
154 }
155 
156 /**
157  * Return the number of bytes consumed for building the current frame.
158  */
159 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
160 {
161  int pos = (get_bits_count(&s->gb) + 7) >> 3;
162 
163  if (s->divx_packed || s->avctx->hwaccel) {
164  /* We would have to scan through the whole buf to handle the weird
165  * reordering ... */
166  return buf_size;
167  } else if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
168  pos -= s->parse_context.last_index;
169  // padding is not really read so this might be -1
170  if (pos < 0)
171  pos = 0;
172  return pos;
173  } else {
174  // avoid infinite loops (maybe not needed...)
175  if (pos == 0)
176  pos = 1;
177  // oops ;)
178  if (pos + 10 > buf_size)
179  pos = buf_size;
180 
181  return pos;
182  }
183 }
184 
186 {
187  const int part_mask = s->partitioned_frame
188  ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
189  const int mb_size = 16 >> s->avctx->lowres;
190  int ret;
191 
192  s->last_resync_gb = s->gb;
193  s->first_slice_line = 1;
194  s->resync_mb_x = s->mb_x;
195  s->resync_mb_y = s->mb_y;
196 
197  ff_set_qscale(s, s->qscale);
198 
199  if (s->avctx->hwaccel) {
200  const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
201  ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
202  // ensure we exit decode loop
203  s->mb_y = s->mb_height;
204  return ret;
205  }
206 
207  if (s->partitioned_frame) {
208  const int qscale = s->qscale;
209 
210  if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
211  if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
212  return ret;
213 
214  /* restore variables which were modified */
215  s->first_slice_line = 1;
216  s->mb_x = s->resync_mb_x;
217  s->mb_y = s->resync_mb_y;
218  ff_set_qscale(s, qscale);
219  }
220 
221  for (; s->mb_y < s->mb_height; s->mb_y++) {
222  /* per-row end of slice checks */
223  if (s->msmpeg4_version) {
224  if (s->resync_mb_y + s->slice_height == s->mb_y) {
226  s->mb_x - 1, s->mb_y, ER_MB_END);
227 
228  return 0;
229  }
230  }
231 
232  if (s->msmpeg4_version == 1) {
233  s->last_dc[0] =
234  s->last_dc[1] =
235  s->last_dc[2] = 128;
236  }
237 
239  for (; s->mb_x < s->mb_width; s->mb_x++) {
240  int ret;
241 
243 
244  if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
245  s->first_slice_line = 0;
246 
247  /* DCT & quantize */
248 
249  s->mv_dir = MV_DIR_FORWARD;
250  s->mv_type = MV_TYPE_16X16;
251  ff_dlog(s, "%d %06X\n",
252  get_bits_count(&s->gb), show_bits(&s->gb, 24));
253 
254  ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
255  ret = s->decode_mb(s, s->block);
256 
257  if (s->pict_type != AV_PICTURE_TYPE_B)
259 
260  if (ret < 0) {
261  const int xy = s->mb_x + s->mb_y * s->mb_stride;
262  if (ret == SLICE_END) {
264  if (s->loop_filter)
266 
268  s->mb_x, s->mb_y, ER_MB_END & part_mask);
269 
270  s->padding_bug_score--;
271 
272  if (++s->mb_x >= s->mb_width) {
273  s->mb_x = 0;
274  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
276  s->mb_y++;
277  }
278  return 0;
279  } else if (ret == SLICE_NOEND) {
281  "Slice mismatch at MB: %d\n", xy);
283  s->mb_x + 1, s->mb_y,
284  ER_MB_END & part_mask);
285  return AVERROR_INVALIDDATA;
286  }
287  av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
289  s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
290 
292  continue;
293  return AVERROR_INVALIDDATA;
294  }
295 
297  if (s->loop_filter)
299  }
300 
301  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
303 
304  s->mb_x = 0;
305  }
306 
307  av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
308 
309  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
311  get_bits_left(&s->gb) >= 48 &&
312  show_bits(&s->gb, 24) == 0x4010 &&
313  !s->data_partitioning)
314  s->padding_bug_score += 32;
315 
316  /* try to detect the padding bug */
317  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
319  get_bits_left(&s->gb) >= 0 &&
320  get_bits_left(&s->gb) < 137 &&
321  !s->data_partitioning) {
322  const int bits_count = get_bits_count(&s->gb);
323  const int bits_left = s->gb.size_in_bits - bits_count;
324 
325  if (bits_left == 0) {
326  s->padding_bug_score += 16;
327  } else if (bits_left != 1) {
328  int v = show_bits(&s->gb, 8);
329  v |= 0x7F >> (7 - (bits_count & 7));
330 
331  if (v == 0x7F && bits_left <= 8)
332  s->padding_bug_score--;
333  else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
334  bits_left <= 16)
335  s->padding_bug_score += 4;
336  else
337  s->padding_bug_score++;
338  }
339  }
340 
341  if (s->codec_id == AV_CODEC_ID_H263 &&
343  get_bits_left(&s->gb) >= 8 &&
344  get_bits_left(&s->gb) < 300 &&
346  show_bits(&s->gb, 8) == 0 &&
347  !s->data_partitioning) {
348 
349  s->padding_bug_score += 32;
350  }
351 
352  if (s->codec_id == AV_CODEC_ID_H263 &&
354  get_bits_left(&s->gb) >= 64 &&
355  AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
356 
357  s->padding_bug_score += 32;
358  }
359 
361  if (
362  (s->padding_bug_score > -2 && !s->data_partitioning))
364  else
366  }
367 
368  // handle formats which don't have unique end markers
369  if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
370  int left = get_bits_left(&s->gb);
371  int max_extra = 7;
372 
373  /* no markers in M$ crap */
375  max_extra += 17;
376 
377  /* buggy padding but the frame should still end approximately at
378  * the bitstream end */
379  if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
381  max_extra += 48;
382  else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
383  max_extra += 256 * 256 * 256 * 64;
384 
385  if (left > max_extra)
387  "discarding %d junk bits at end, next would be %X\n",
388  left, show_bits(&s->gb, 24));
389  else if (left < 0)
390  av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
391  else
393  s->mb_x - 1, s->mb_y, ER_MB_END);
394 
395  return 0;
396  }
397 
399  "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
400  get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
401 
402  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
403  ER_MB_END & part_mask);
404 
405  return AVERROR_INVALIDDATA;
406 }
407 
408 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
409  AVPacket *avpkt)
410 {
411  const uint8_t *buf = avpkt->data;
412  int buf_size = avpkt->size;
413  MpegEncContext *s = avctx->priv_data;
414  int ret;
415  int slice_ret = 0;
416  AVFrame *pict = data;
417 
418  /* no supplementary picture */
419  if (buf_size == 0) {
420  /* special case for last picture */
421  if (s->low_delay == 0 && s->next_picture_ptr) {
422  if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
423  return ret;
424  s->next_picture_ptr = NULL;
425 
426  *got_frame = 1;
427  }
428 
429  return 0;
430  }
431 
432  if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
433  int next;
434 
435  if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
436  next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
437  } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
438  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
439  } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
440  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
441  } else {
443  "this codec does not support truncated bitstreams\n");
444  return AVERROR(ENOSYS);
445  }
446 
447  if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
448  &buf_size) < 0)
449  return buf_size;
450  }
451 
452 retry:
453  if (s->divx_packed && s->bitstream_buffer_size) {
454  int i;
455  for(i=0; i < buf_size-3; i++) {
456  if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
457  if (buf[i+3]==0xB0) {
458  av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
459  s->bitstream_buffer_size = 0;
460  }
461  break;
462  }
463  }
464  }
465 
466  if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder
467  ret = init_get_bits8(&s->gb, s->bitstream_buffer,
469  else
470  ret = init_get_bits8(&s->gb, buf, buf_size);
471 
472  s->bitstream_buffer_size = 0;
473  if (ret < 0)
474  return ret;
475 
476  if (!s->context_initialized)
477  // we need the idct permutation for reading a custom matrix
478  ff_mpv_idct_init(s);
479 
480  /* let's go :-) */
481  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
483  } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
485  } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
486  if (s->avctx->extradata_size && s->picture_number == 0) {
487  GetBitContext gb;
488 
489  if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
491  }
492  ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
493  } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
495  } else if (CONFIG_FLV_DECODER && s->h263_flv) {
497  } else {
499  }
500 
501  if (ret < 0 || ret == FRAME_SKIPPED) {
502  if ( s->width != avctx->coded_width
503  || s->height != avctx->coded_height) {
504  av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
505  s->width = avctx->coded_width;
506  s->height= avctx->coded_height;
507  }
508  }
509  if (ret == FRAME_SKIPPED)
510  return get_consumed_bytes(s, buf_size);
511 
512  /* skip if the header was thrashed */
513  if (ret < 0) {
514  av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
515  return ret;
516  }
517 
518  if (!s->context_initialized) {
519  avctx->pix_fmt = h263_get_format(avctx);
520  if ((ret = ff_mpv_common_init(s)) < 0)
521  return ret;
522  }
523 
524  if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
525  int i = ff_find_unused_picture(s->avctx, s->picture, 0);
526  if (i < 0)
527  return i;
528  s->current_picture_ptr = &s->picture[i];
529  }
530 
531  avctx->has_b_frames = !s->low_delay;
532 
533  if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
534  if (ff_mpeg4_workaround_bugs(avctx) == 1)
535  goto retry;
536  }
537 
538  /* After H.263 & MPEG-4 header decode we have the height, width,
539  * and other parameters. So then we could init the picture.
540  * FIXME: By the way H.263 decoder is evolving it should have
541  * an H263EncContext */
542  if (s->width != avctx->coded_width ||
543  s->height != avctx->coded_height ||
544  s->context_reinit) {
545  /* H.263 could change picture size any time */
546  s->context_reinit = 0;
547 
548  ret = ff_set_dimensions(avctx, s->width, s->height);
549  if (ret < 0)
550  return ret;
551 
552  ff_set_sar(avctx, avctx->sample_aspect_ratio);
553 
554  if ((ret = ff_mpv_common_frame_size_change(s)))
555  return ret;
556 
557  if (avctx->pix_fmt != h263_get_format(avctx)) {
558  av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
559  avctx->pix_fmt = AV_PIX_FMT_NONE;
560  return AVERROR_UNKNOWN;
561  }
562  }
563 
564  if (s->codec_id == AV_CODEC_ID_H263 ||
565  s->codec_id == AV_CODEC_ID_H263P ||
568 
569  // for skipping the frame
572 
573  /* skip B-frames if we don't have reference frames */
574  if (!s->last_picture_ptr &&
575  (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
576  return get_consumed_bytes(s, buf_size);
577  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
578  s->pict_type == AV_PICTURE_TYPE_B) ||
579  (avctx->skip_frame >= AVDISCARD_NONKEY &&
580  s->pict_type != AV_PICTURE_TYPE_I) ||
581  avctx->skip_frame >= AVDISCARD_ALL)
582  return get_consumed_bytes(s, buf_size);
583 
584  if (s->next_p_frame_damaged) {
585  if (s->pict_type == AV_PICTURE_TYPE_B)
586  return get_consumed_bytes(s, buf_size);
587  else
588  s->next_p_frame_damaged = 0;
589  }
590 
591  if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
594  } else {
597  }
598 
599  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
600  return ret;
601 
602  if (!s->divx_packed)
603  ff_thread_finish_setup(avctx);
604 
605  if (avctx->hwaccel) {
606  ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
607  s->gb.buffer_end - s->gb.buffer);
608  if (ret < 0 )
609  return ret;
610  }
611 
613 
614  /* the second part of the wmv2 header contains the MB skip bits which
615  * are stored in current_picture->mb_type which is not available before
616  * ff_mpv_frame_start() */
617  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
619  if (ret < 0)
620  return ret;
621  if (ret == 1)
622  goto frame_end;
623  }
624 
625  /* decode each macroblock */
626  s->mb_x = 0;
627  s->mb_y = 0;
628 
629  slice_ret = decode_slice(s);
630  while (s->mb_y < s->mb_height) {
631  if (s->msmpeg4_version) {
632  if (s->slice_height == 0 || s->mb_x != 0 ||
633  (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
634  break;
635  } else {
636  int prev_x = s->mb_x, prev_y = s->mb_y;
637  if (ff_h263_resync(s) < 0)
638  break;
639  if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
640  s->er.error_occurred = 1;
641  }
642 
643  if (s->msmpeg4_version < 4 && s->h263_pred)
645 
646  if (decode_slice(s) < 0)
647  slice_ret = AVERROR_INVALIDDATA;
648  }
649 
650  if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
652  if (!CONFIG_MSMPEG4_DECODER ||
653  ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
655 
657 frame_end:
658  ff_er_frame_end(&s->er);
659 
660  if (avctx->hwaccel) {
661  ret = avctx->hwaccel->end_frame(avctx);
662  if (ret < 0)
663  return ret;
664  }
665 
666  ff_mpv_frame_end(s);
667 
668  if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
669  ff_mpeg4_frame_end(avctx, buf, buf_size);
670 
671  if (!s->divx_packed && avctx->hwaccel)
672  ff_thread_finish_setup(avctx);
673 
676  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
677  if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
678  return ret;
681  } else if (s->last_picture_ptr) {
682  if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
683  return ret;
686  }
687 
688  if (s->last_picture_ptr || s->low_delay) {
689  if ( pict->format == AV_PIX_FMT_YUV420P
690  && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
691  int x, y, p;
693  for (p=0; p<3; p++) {
694  int w = AV_CEIL_RSHIFT(pict-> width, !!p);
695  int h = AV_CEIL_RSHIFT(pict->height, !!p);
696  int linesize = pict->linesize[p];
697  for (y=0; y<(h>>1); y++)
698  for (x=0; x<w; x++)
699  FFSWAP(int,
700  pict->data[p][x + y*linesize],
701  pict->data[p][x + (h-1-y)*linesize]);
702  }
703  }
704  *got_frame = 1;
705  }
706 
707  if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
708  return slice_ret;
709  else
710  return get_consumed_bytes(s, buf_size);
711 }
712 
714 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
716 #endif
717 #if CONFIG_MPEG4_VDPAU_HWACCEL
719 #endif
720 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
722 #endif
725 };
726 
728  .name = "h263",
729  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
730  .type = AVMEDIA_TYPE_VIDEO,
731  .id = AV_CODEC_ID_H263,
732  .priv_data_size = sizeof(MpegEncContext),
734  .close = ff_h263_decode_end,
738  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
739  .flush = ff_mpeg_flush,
740  .max_lowres = 3,
742 };
743 
745  .name = "h263p",
746  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
747  .type = AVMEDIA_TYPE_VIDEO,
748  .id = AV_CODEC_ID_H263P,
749  .priv_data_size = sizeof(MpegEncContext),
751  .close = ff_h263_decode_end,
755  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
756  .flush = ff_mpeg_flush,
757  .max_lowres = 3,
759 };
int bitstream_buffer_size
Definition: mpegvideo.h:411
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2621
#define ff_tlog(ctx,...)
Definition: internal.h:80
#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:1229
const struct AVCodec * codec
Definition: avcodec.h:1490
discard all frames except keyframes
Definition: avcodec.h:789
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2516
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:3483
qpel_mc_func avg_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:74
int picture_number
Definition: mpegvideo.h:124
const char * s
Definition: avisynth_c.h:768
#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:513
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static void flush(AVCodecContext *avctx)
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1668
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:501
#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:194
hardware decoding through Videotoolbox
Definition: pixfmt.h:278
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static int decode_slice(MpegEncContext *s)
Definition: h263dec.c:185
void ff_er_frame_end(ERContext *s)
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:2111
int msmpeg4_version
0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
Definition: mpegvideo.h:433
av_cold void ff_h263dsp_init(H263DSPContext *ctx)
Definition: h263dsp.c:117
int size
Definition: avcodec.h:1400
uint8_t * bitstream_buffer
Definition: mpegvideo.h:410
enum AVCodecID codec_id
Definition: mpegvideo.h:109
#define AV_EF_BUFFER
detect improper bitstream length
Definition: avcodec.h:2615
const uint8_t * buffer
Definition: get_bits.h:56
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:1859
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1690
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size)
Definition: msmpeg4dec.c:556
mpegvideo header.
discard all
Definition: avcodec.h:790
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
int padding_bug_score
used to detect the VERY common padding bug in MPEG-4
Definition: mpegvideo.h:406
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:130
QpelDSPContext qdsp
Definition: mpegvideo.h:232
AVCodec.
Definition: avcodec.h:3289
int qscale
QP.
Definition: mpegvideo.h:201
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
int quant_precision
Definition: mpegvideo.h:395
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:682
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:2926
void ff_mpeg4_clean_buffers(MpegEncContext *s)
Definition: mpeg4video.c:45
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2637
#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:980
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo.c:2509
int context_reinit
Definition: mpegvideo.h:546
static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
Definition: h263dec.c:47
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:101
int ff_mpv_common_frame_size_change(MpegEncContext *s)
Definition: mpegvideo.c:1037
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:400
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1581
int no_rounding
apply no rounding to motion compensation (MPEG-4, msmpeg4, ...) for B-frames rounding mode is always ...
Definition: mpegvideo.h:281
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:177
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:355
int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
Definition: mpegpicture.c:442
quarterpel DSP functions
uint8_t * data
Definition: avcodec.h:1399
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
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:209
#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:126
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:2712
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:117
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...
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:857
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2118
#define av_log(a,...)
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:728
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2579
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:408
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:587
enum AVCodecID id
Definition: avcodec.h:3303
H263DSPContext h263dsp
Definition: mpegvideo.h:234
#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:1770
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:182
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:251
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:400
#define AVERROR(e)
Definition: error.h:43
AVCodec ff_h263_decoder
Definition: h263dec.c:727
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:220
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:190
ERContext er
Definition: mpegvideo.h:548
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1561
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2514
uint16_t width
Definition: gdv.c:47
const char * name
Name of the codec implementation.
Definition: avcodec.h:3296
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:401
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:73
GetBitContext gb
Definition: mpegvideo.h:443
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:497
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1116
int ff_flv_decode_picture_header(MpegEncContext *s)
Definition: flvdec.c:28
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2548
static void frame_end(MpegEncContext *s)
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:353
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:949
int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type)
Definition: mpegvideo.c:1743
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3310
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:284
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2605
#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:159
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:357
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:181
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:46
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode MPEG-4 headers.
int size_in_bits
Definition: get_bits.h:58
int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:147
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:296
AVCodec ff_h263p_decoder
Definition: h263dec.c:744
MotionEstContext me
Definition: mpegvideo.h:279
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2616
#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:408
void ff_mpv_decode_defaults(MpegEncContext *s)
Set the given MpegEncContext to defaults for decoding.
Definition: mpegvideo.c:657
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:148
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:274
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:263
int first_slice_line
used in MPEG-4 too to handle resync markers
Definition: mpegvideo.h:431
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:107
enum AVCodecID codec_id
Definition: avcodec.h:1491
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:456
main external API structure.
Definition: avcodec.h:1481
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1506
void * buf
Definition: avisynth_c.h:690
void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
Definition: mpegvideo.c:1736
#define SLICE_END
end marker found
Definition: mpegvideo.h:500
Picture * picture
main picture buffer
Definition: mpegvideo.h:133
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:399
int extradata_size
Definition: avcodec.h:1582
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
int coded_height
Definition: avcodec.h:1668
struct AVFrame * f
Definition: mpegpicture.h:46
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: pixfmt.h:193
int context_initialized
Definition: mpegvideo.h:121
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2618
int slice_height
in macroblocks
Definition: mpegvideo.h:430
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:984
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:1190
#define MV_DIR_FORWARD
Definition: mpegvideo.h:259
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:266
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:956
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2511
int h263_pred
use MPEG-4/H.263 ac/dc predictions
Definition: mpegvideo.h:102
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:61
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
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:566
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
qpel_mc_func(* qpel_avg)[16]
Definition: motion_est.h:92
the normal 219*2^(n-8) "MPEG" YUV ranges
Definition: pixfmt.h:491
MpegEncContext.
Definition: mpegvideo.h:78
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:180
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
discard all non reference
Definition: avcodec.h:786
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:62
Y , 8bpp.
Definition: pixfmt.h:70
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:127
void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
Definition: mpegvideo.c:662
#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:56
int ff_wmv2_decode_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:127
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:713
Picture * last_picture_ptr
pointer to the previous picture.
Definition: mpegvideo.h:179
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:1508
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:877
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1414
void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:2497
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:354
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:495
ParseContext parse_context
Definition: mpegvideo.h:359
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:279
#define AV_CODEC_FLAG_TRUNCATED
Input bitstream might be truncated at a random location instead of only at frame boundaries.
Definition: avcodec.h:866
int height
Definition: frame.h:259
void INT64 start
Definition: avisynth_c.h:690
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:116
MPEG-1 4:2:0, JPEG 4:2:0, H.263 4:2:0.
Definition: pixfmt.h:514
#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
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:3511
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:86
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:3522
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1376
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:2593
#define MAX_NVOP_SIZE
Definition: mpeg4video.h:63
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:955
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58