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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 "vdpau_compat.h"
45 #include "thread.h"
46 #include "wmv2.h"
47 
49 {
50  if (avctx->codec->id == AV_CODEC_ID_MSS2)
51  return AV_PIX_FMT_YUV420P;
52 
53  if (CONFIG_GRAY && (avctx->flags & CODEC_FLAG_GRAY)) {
56  return AV_PIX_FMT_GRAY8;
57  }
58 
59  return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
60 }
61 
63 {
64  MpegEncContext *s = avctx->priv_data;
65  int ret;
66 
67  s->out_format = FMT_H263;
68 
69  // set defaults
71  ff_mpv_decode_init(s, avctx);
72 
73  s->quant_precision = 5;
75  s->low_delay = 1;
76  s->unrestricted_mv = 1;
77 
78  /* select sub codec */
79  switch (avctx->codec->id) {
80  case AV_CODEC_ID_H263:
81  case AV_CODEC_ID_H263P:
82  s->unrestricted_mv = 0;
84  break;
85  case AV_CODEC_ID_MPEG4:
86  break;
88  s->h263_pred = 1;
89  s->msmpeg4_version = 1;
90  break;
92  s->h263_pred = 1;
93  s->msmpeg4_version = 2;
94  break;
96  s->h263_pred = 1;
97  s->msmpeg4_version = 3;
98  break;
99  case AV_CODEC_ID_WMV1:
100  s->h263_pred = 1;
101  s->msmpeg4_version = 4;
102  break;
103  case AV_CODEC_ID_WMV2:
104  s->h263_pred = 1;
105  s->msmpeg4_version = 5;
106  break;
107  case AV_CODEC_ID_VC1:
108  case AV_CODEC_ID_WMV3:
111  case AV_CODEC_ID_MSS2:
112  s->h263_pred = 1;
113  s->msmpeg4_version = 6;
115  break;
116  case AV_CODEC_ID_H263I:
117  break;
118  case AV_CODEC_ID_FLV1:
119  s->h263_flv = 1;
120  break;
121  default:
122  av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
123  avctx->codec->id);
124  return AVERROR(ENOSYS);
125  }
126  s->codec_id = avctx->codec->id;
127 
128  if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
129  if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
130  s->ehc_mode = 1;
131 
132  /* for h263, we allocate the images after having read the header */
133  if (avctx->codec->id != AV_CODEC_ID_H263 &&
134  avctx->codec->id != AV_CODEC_ID_H263P &&
135  avctx->codec->id != AV_CODEC_ID_MPEG4) {
136  avctx->pix_fmt = h263_get_format(avctx);
137  ff_mpv_idct_init(s);
138  if ((ret = ff_mpv_common_init(s)) < 0)
139  return ret;
140  }
141 
143  ff_qpeldsp_init(&s->qdsp);
145 
146  return 0;
147 }
148 
150 {
151  MpegEncContext *s = avctx->priv_data;
152 
154  return 0;
155 }
156 
157 /**
158  * Return the number of bytes consumed for building the current frame.
159  */
160 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
161 {
162  int pos = (get_bits_count(&s->gb) + 7) >> 3;
163 
164  if (s->divx_packed || s->avctx->hwaccel) {
165  /* We would have to scan through the whole buf to handle the weird
166  * reordering ... */
167  return buf_size;
168  } else if (s->avctx->flags & CODEC_FLAG_TRUNCATED) {
169  pos -= s->parse_context.last_index;
170  // padding is not really read so this might be -1
171  if (pos < 0)
172  pos = 0;
173  return pos;
174  } else {
175  // avoid infinite loops (maybe not needed...)
176  if (pos == 0)
177  pos = 1;
178  // oops ;)
179  if (pos + 10 > buf_size)
180  pos = buf_size;
181 
182  return pos;
183  }
184 }
185 
187 {
188  const int part_mask = s->partitioned_frame
189  ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
190  const int mb_size = 16 >> s->avctx->lowres;
191  int ret;
192 
193  s->last_resync_gb = s->gb;
194  s->first_slice_line = 1;
195  s->resync_mb_x = s->mb_x;
196  s->resync_mb_y = s->mb_y;
197 
198  ff_set_qscale(s, s->qscale);
199 
200  if (s->avctx->hwaccel) {
201  const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
202  ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
203  // ensure we exit decode loop
204  s->mb_y = s->mb_height;
205  return ret;
206  }
207 
208  if (s->partitioned_frame) {
209  const int qscale = s->qscale;
210 
211  if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
212  if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
213  return ret;
214 
215  /* restore variables which were modified */
216  s->first_slice_line = 1;
217  s->mb_x = s->resync_mb_x;
218  s->mb_y = s->resync_mb_y;
219  ff_set_qscale(s, qscale);
220  }
221 
222  for (; s->mb_y < s->mb_height; s->mb_y++) {
223  /* per-row end of slice checks */
224  if (s->msmpeg4_version) {
225  if (s->resync_mb_y + s->slice_height == s->mb_y) {
227  s->mb_x - 1, s->mb_y, ER_MB_END);
228 
229  return 0;
230  }
231  }
232 
233  if (s->msmpeg4_version == 1) {
234  s->last_dc[0] =
235  s->last_dc[1] =
236  s->last_dc[2] = 128;
237  }
238 
240  for (; s->mb_x < s->mb_width; s->mb_x++) {
241  int ret;
242 
244 
245  if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
246  s->first_slice_line = 0;
247 
248  /* DCT & quantize */
249 
250  s->mv_dir = MV_DIR_FORWARD;
251  s->mv_type = MV_TYPE_16X16;
252  ff_dlog(s, "%d %d %06X\n",
253  ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
254 
255  ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
256  ret = s->decode_mb(s, s->block);
257 
258  if (s->pict_type != AV_PICTURE_TYPE_B)
260 
261  if (ret < 0) {
262  const int xy = s->mb_x + s->mb_y * s->mb_stride;
263  if (ret == SLICE_END) {
264  ff_mpv_decode_mb(s, s->block);
265  if (s->loop_filter)
267 
269  s->mb_x, s->mb_y, ER_MB_END & part_mask);
270 
271  s->padding_bug_score--;
272 
273  if (++s->mb_x >= s->mb_width) {
274  s->mb_x = 0;
275  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
277  s->mb_y++;
278  }
279  return 0;
280  } else if (ret == SLICE_NOEND) {
282  "Slice mismatch at MB: %d\n", xy);
284  s->mb_x + 1, s->mb_y,
285  ER_MB_END & part_mask);
286  return AVERROR_INVALIDDATA;
287  }
288  av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
290  s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
291 
293  continue;
294  return AVERROR_INVALIDDATA;
295  }
296 
297  ff_mpv_decode_mb(s, s->block);
298  if (s->loop_filter)
300  }
301 
302  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
304 
305  s->mb_x = 0;
306  }
307 
308  av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
309 
310  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
312  get_bits_left(&s->gb) >= 48 &&
313  show_bits(&s->gb, 24) == 0x4010 &&
314  !s->data_partitioning)
315  s->padding_bug_score += 32;
316 
317  /* try to detect the padding bug */
318  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
320  get_bits_left(&s->gb) >= 0 &&
321  get_bits_left(&s->gb) < 137 &&
322  !s->data_partitioning) {
323  const int bits_count = get_bits_count(&s->gb);
324  const int bits_left = s->gb.size_in_bits - bits_count;
325 
326  if (bits_left == 0) {
327  s->padding_bug_score += 16;
328  } else if (bits_left != 1) {
329  int v = show_bits(&s->gb, 8);
330  v |= 0x7F >> (7 - (bits_count & 7));
331 
332  if (v == 0x7F && bits_left <= 8)
333  s->padding_bug_score--;
334  else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
335  bits_left <= 16)
336  s->padding_bug_score += 4;
337  else
338  s->padding_bug_score++;
339  }
340  }
341 
342  if (s->codec_id == AV_CODEC_ID_H263 &&
344  get_bits_left(&s->gb) >= 8 &&
345  get_bits_left(&s->gb) < 300 &&
347  show_bits(&s->gb, 8) == 0 &&
348  !s->data_partitioning) {
349 
350  s->padding_bug_score += 32;
351  }
352 
353  if (s->codec_id == AV_CODEC_ID_H263 &&
355  get_bits_left(&s->gb) >= 64 &&
356  AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
357 
358  s->padding_bug_score += 32;
359  }
360 
362  if (
363  (s->padding_bug_score > -2 && !s->data_partitioning))
365  else
367  }
368 
369  // handle formats which don't have unique end markers
370  if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
371  int left = get_bits_left(&s->gb);
372  int max_extra = 7;
373 
374  /* no markers in M$ crap */
376  max_extra += 17;
377 
378  /* buggy padding but the frame should still end approximately at
379  * the bitstream end */
380  if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
382  max_extra += 48;
383  else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
384  max_extra += 256 * 256 * 256 * 64;
385 
386  if (left > max_extra)
388  "discarding %d junk bits at end, next would be %X\n",
389  left, show_bits(&s->gb, 24));
390  else if (left < 0)
391  av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
392  else
394  s->mb_x - 1, s->mb_y, ER_MB_END);
395 
396  return 0;
397  }
398 
400  "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
401  get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
402 
403  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
404  ER_MB_END & part_mask);
405 
406  return AVERROR_INVALIDDATA;
407 }
408 
409 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
410  AVPacket *avpkt)
411 {
412  const uint8_t *buf = avpkt->data;
413  int buf_size = avpkt->size;
414  MpegEncContext *s = avctx->priv_data;
415  int ret;
416  int slice_ret = 0;
417  AVFrame *pict = data;
418 
419  /* no supplementary picture */
420  if (buf_size == 0) {
421  /* special case for last picture */
422  if (s->low_delay == 0 && s->next_picture_ptr) {
423  if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
424  return ret;
425  s->next_picture_ptr = NULL;
426 
427  *got_frame = 1;
428  }
429 
430  return 0;
431  }
432 
433  if (s->avctx->flags & CODEC_FLAG_TRUNCATED) {
434  int next;
435 
436  if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
437  next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
438  } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
439  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
440  } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
441  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
442  } else {
444  "this codec does not support truncated bitstreams\n");
445  return AVERROR(ENOSYS);
446  }
447 
448  if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
449  &buf_size) < 0)
450  return buf_size;
451  }
452 
453 retry:
454  if (s->divx_packed && s->bitstream_buffer_size) {
455  int i;
456  for(i=0; i < buf_size-3; i++) {
457  if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
458  if (buf[i+3]==0xB0) {
459  av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
460  s->bitstream_buffer_size = 0;
461  }
462  break;
463  }
464  }
465  }
466 
467  if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder
468  ret = init_get_bits8(&s->gb, s->bitstream_buffer,
470  else
471  ret = init_get_bits8(&s->gb, buf, buf_size);
472 
473  s->bitstream_buffer_size = 0;
474  if (ret < 0)
475  return ret;
476 
477  if (!s->context_initialized)
478  // we need the idct permutaton for reading a custom matrix
479  ff_mpv_idct_init(s);
480 
481  /* let's go :-) */
482  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
484  } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
486  } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
487  if (s->avctx->extradata_size && s->picture_number == 0) {
488  GetBitContext gb;
489 
490  if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
492  }
493  ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
494  } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
496  } else if (CONFIG_FLV_DECODER && s->h263_flv) {
498  } else {
500  }
501 
502  if (ret < 0 || ret == FRAME_SKIPPED) {
503  if ( s->width != avctx->coded_width
504  || s->height != avctx->coded_height) {
505  av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
506  s->width = avctx->coded_width;
507  s->height= avctx->coded_height;
508  }
509  }
510  if (ret == FRAME_SKIPPED)
511  return get_consumed_bytes(s, buf_size);
512 
513  /* skip if the header was thrashed */
514  if (ret < 0) {
515  av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
516  return ret;
517  }
518 
519  if (!s->context_initialized) {
520  avctx->pix_fmt = h263_get_format(avctx);
521  if ((ret = ff_mpv_common_init(s)) < 0)
522  return ret;
523  }
524 
525  if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
526  int i = ff_find_unused_picture(s->avctx, s->picture, 0);
527  if (i < 0)
528  return i;
529  s->current_picture_ptr = &s->picture[i];
530  }
531 
532  avctx->has_b_frames = !s->low_delay;
533 
534  if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
535  if (ff_mpeg4_workaround_bugs(avctx) == 1)
536  goto retry;
537  }
538 
539  /* After H263 & mpeg4 header decode we have the height, width,
540  * and other parameters. So then we could init the picture.
541  * FIXME: By the way H263 decoder is evolving it should have
542  * an H263EncContext */
543  if (s->width != avctx->coded_width ||
544  s->height != avctx->coded_height ||
545  s->context_reinit) {
546  /* H.263 could change picture size any time */
547  s->context_reinit = 0;
548 
549  ret = ff_set_dimensions(avctx, s->width, s->height);
550  if (ret < 0)
551  return ret;
552 
553  ff_set_sar(avctx, avctx->sample_aspect_ratio);
554 
555  if ((ret = ff_mpv_common_frame_size_change(s)))
556  return ret;
557 
558  if (avctx->pix_fmt != h263_get_format(avctx)) {
559  av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
560  avctx->pix_fmt = AV_PIX_FMT_NONE;
561  return AVERROR_UNKNOWN;
562  }
563  }
564 
565  if (s->codec_id == AV_CODEC_ID_H263 ||
566  s->codec_id == AV_CODEC_ID_H263P ||
569 
570  // for skipping the frame
573 
574  /* skip B-frames if we don't have reference frames */
575  if (!s->last_picture_ptr &&
576  (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
577  return get_consumed_bytes(s, buf_size);
578  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
579  s->pict_type == AV_PICTURE_TYPE_B) ||
580  (avctx->skip_frame >= AVDISCARD_NONKEY &&
581  s->pict_type != AV_PICTURE_TYPE_I) ||
582  avctx->skip_frame >= AVDISCARD_ALL)
583  return get_consumed_bytes(s, buf_size);
584 
585  if (s->next_p_frame_damaged) {
586  if (s->pict_type == AV_PICTURE_TYPE_B)
587  return get_consumed_bytes(s, buf_size);
588  else
589  s->next_p_frame_damaged = 0;
590  }
591 
592  if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
595  } else {
598  }
599 
600  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
601  return ret;
602 
603  if (!s->divx_packed && !avctx->hwaccel)
604  ff_thread_finish_setup(avctx);
605 
606  if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
608  goto frame_end;
609  }
610 
611  if (avctx->hwaccel) {
612  ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
613  s->gb.buffer_end - s->gb.buffer);
614  if (ret < 0 )
615  return ret;
616  }
617 
619 
620  /* the second part of the wmv2 header contains the MB skip bits which
621  * are stored in current_picture->mb_type which is not available before
622  * ff_mpv_frame_start() */
623  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
625  if (ret < 0)
626  return ret;
627  if (ret == 1)
628  goto frame_end;
629  }
630 
631  /* decode each macroblock */
632  s->mb_x = 0;
633  s->mb_y = 0;
634 
635  slice_ret = decode_slice(s);
636  while (s->mb_y < s->mb_height) {
637  if (s->msmpeg4_version) {
638  if (s->slice_height == 0 || s->mb_x != 0 ||
639  (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
640  break;
641  } else {
642  int prev_x = s->mb_x, prev_y = s->mb_y;
643  if (ff_h263_resync(s) < 0)
644  break;
645  if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
646  s->er.error_occurred = 1;
647  }
648 
649  if (s->msmpeg4_version < 4 && s->h263_pred)
651 
652  if (decode_slice(s) < 0)
653  slice_ret = AVERROR_INVALIDDATA;
654  }
655 
656  if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
658  if (!CONFIG_MSMPEG4_DECODER ||
659  ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
661 
663 frame_end:
664  ff_er_frame_end(&s->er);
665 
666  if (avctx->hwaccel) {
667  ret = avctx->hwaccel->end_frame(avctx);
668  if (ret < 0)
669  return ret;
670  }
671 
672  ff_mpv_frame_end(s);
673 
674  if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
675  ff_mpeg4_frame_end(avctx, buf, buf_size);
676 
677  if (!s->divx_packed && avctx->hwaccel)
678  ff_thread_finish_setup(avctx);
679 
682  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
683  if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
684  return ret;
687  } else if (s->last_picture_ptr) {
688  if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
689  return ret;
692  }
693 
694  if (s->last_picture_ptr || s->low_delay) {
695  if ( pict->format == AV_PIX_FMT_YUV420P
696  && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
697  int x, y, p;
699  for (p=0; p<3; p++) {
700  int w = FF_CEIL_RSHIFT(pict-> width, !!p);
701  int h = FF_CEIL_RSHIFT(pict->height, !!p);
702  int linesize = pict->linesize[p];
703  for (y=0; y<(h>>1); y++)
704  for (x=0; x<w; x++)
705  FFSWAP(int,
706  pict->data[p][x + y*linesize],
707  pict->data[p][x + (h-1-y)*linesize]);
708  }
709  }
710  *got_frame = 1;
711  }
712 
713  if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
714  return ret;
715  else
716  return get_consumed_bytes(s, buf_size);
717 }
718 
720 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
722 #endif
723 #if CONFIG_H263_VDPAU_HWACCEL || CONFIG_MPEG4_VDPAU_HWACCEL
725 #endif
728 };
729 
731  .name = "h263",
732  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
733  .type = AVMEDIA_TYPE_VIDEO,
734  .id = AV_CODEC_ID_H263,
735  .priv_data_size = sizeof(MpegEncContext),
737  .close = ff_h263_decode_end,
739  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
741  .flush = ff_mpeg_flush,
742  .max_lowres = 3,
744 };
745 
747  .name = "h263p",
748  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
749  .type = AVMEDIA_TYPE_VIDEO,
750  .id = AV_CODEC_ID_H263P,
751  .priv_data_size = sizeof(MpegEncContext),
753  .close = ff_h263_decode_end,
755  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
757  .flush = ff_mpeg_flush,
758  .max_lowres = 3,
760 };
int bitstream_buffer_size
Definition: mpegvideo.h:479
#define ff_tlog(ctx,...)
Definition: internal.h:60
#define NULL
Definition: coverity.c:32
const struct AVCodec * codec
Definition: avcodec.h:1250
discard all frames except keyframes
Definition: avcodec.h:668
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:3148
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:3351
float v
qpel_mc_func avg_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:74
int picture_number
Definition: mpegvideo.h:196
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
mpeg2/4 4:2:0, h264 default for 4:2:0
Definition: pixfmt.h:544
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1424
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:564
#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:229
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static int decode_slice(MpegEncContext *s)
Definition: h263dec.c:186
#define CODEC_CAP_TRUNCATED
Definition: avcodec.h:790
void ff_er_frame_end(ERContext *s)
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1960
int msmpeg4_version
0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
Definition: mpegvideo.h:499
av_cold void ff_h263dsp_init(H263DSPContext *ctx)
Definition: h263dsp.c:117
int size
Definition: avcodec.h:1163
uint8_t * bitstream_buffer
Definition: mpegvideo.h:478
enum AVCodecID codec_id
Definition: mpegvideo.h:181
HW decoding through VA API, Picture.data[3] contains a vaapi_render_state struct which contains the b...
Definition: pixfmt.h:126
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2628
const uint8_t * buffer
Definition: get_bits.h:55
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:1623
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1444
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:553
mpegvideo header.
discard all
Definition: avcodec.h:669
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
int padding_bug_score
used to detect the VERY common padding bug in MPEG4
Definition: mpegvideo.h:474
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:202
QpelDSPContext qdsp
Definition: mpegvideo.h:304
AVCodec.
Definition: avcodec.h:3181
int qscale
QP.
Definition: mpegvideo.h:273
int quant_precision
Definition: mpegvideo.h:463
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:607
#define FF_QSCALE_TYPE_MPEG1
Definition: avcodec.h:948
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:2947
void ff_mpeg4_clean_buffers(MpegEncContext *s)
Definition: mpeg4video.c:45
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2644
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo.c:3141
int context_reinit
Definition: mpegvideo.h:608
static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
Definition: h263dec.c:48
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:105
uint8_t
#define av_cold
Definition: attributes.h:74
enum OutputFormat out_format
output format
Definition: mpegvideo.h:173
int ff_mpv_common_frame_size_change(MpegEncContext *s)
Definition: mpegvideo.c:1395
Multithreading support functions.
void ff_vdpau_mpeg4_decode_picture(Mpeg4DecContext *s, const uint8_t *buf, int buf_size)
#define CODEC_CAP_HWACCEL_VDPAU
Codec can export data for HW decoding (VDPAU).
Definition: avcodec.h:834
#define ER_MB_ERROR
qpel_mc_func(* qpel_put)[16]
Definition: motion_est.h:81
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:363
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1355
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:351
void ff_mpv_decode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:3129
int ff_intel_h263_decode_picture_header(MpegEncContext *s)
Definition: intelh263dec.c:26
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:249
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:424
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:789
quarterpel DSP functions
uint8_t * data
Definition: avcodec.h:1162
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:212
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2516
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:244
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:346
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:198
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:2737
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:189
void ff_thread_finish_setup(AVCodecContext *avctx)
If the codec defines update_thread_context(), call this when they are ready for the next thread to st...
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1967
#define av_log(a,...)
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:759
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:3240
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:398
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2625
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:588
enum AVCodecID id
Definition: avcodec.h:3195
H263DSPContext h263dsp
Definition: mpegvideo.h:306
#define CODEC_FLAG_TRUNCATED
Definition: avcodec.h:747
#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:1533
int last_dc[3]
last DC values for MPEG1
Definition: mpegvideo.h:254
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2623
#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:824
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:231
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:468
#define AVERROR(e)
Definition: error.h:43
AVCodec ff_h263_decoder
Definition: h263dec.c:730
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:292
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
ERContext er
Definition: mpegvideo.h:610
int capabilities
Codec capabilities.
Definition: avcodec.h:3200
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1335
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2510
const char * name
Name of the codec implementation.
Definition: avcodec.h:3188
int low_delay
no reordering needed / has no b-frames
Definition: mpegvideo.h:469
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:73
GetBitContext gb
Definition: mpegvideo.h:509
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:560
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1474
Libavcodec external API header.
int ff_flv_decode_picture_header(MpegEncContext *s)
Definition: flvdec.c:28
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:3209
static void frame_end(MpegEncContext *s)
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:422
uint8_t * error_status_table
#define ER_AC_ERROR
void ff_h263_loop_filter(MpegEncContext *s)
Definition: h263.c:139
int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type)
Definition: mpegvideo.c:2377
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3202
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:242
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2612
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
#define CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:783
static int get_consumed_bytes(MpegEncContext *s, int buf_size)
Return the number of bytes consumed for building the current frame.
Definition: h263dec.c:160
int last_index
Definition: parser.h:31
float y
int next_p_frame_damaged
set if the next p frame is damaged, to avoid showing trashed b frames
Definition: mpegvideo.h:426
ret
Definition: avfilter.c:974
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:253
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:46
#define FF_CEIL_RSHIFT(a, b)
Definition: common.h:57
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode mpeg4 headers.
int size_in_bits
Definition: get_bits.h:57
int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:140
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:287
AVCodec ff_h263p_decoder
Definition: h263dec.c:746
MotionEstContext me
Definition: mpegvideo.h:349
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:409
void ff_mpv_decode_defaults(MpegEncContext *s)
Set the given MpegEncContext to defaults for decoding.
Definition: mpegvideo.c:1054
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:149
static void flush(AVCodecContext *avctx)
Definition: aacdec.c:514
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
Definition: utils.c:1198
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:232
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:333
int first_slice_line
used in mpeg4 too to handle resync markers
Definition: mpegvideo.h:497
void ff_h263_update_motion_val(MpegEncContext *s)
Definition: h263.c:46
#define ff_dlog(ctx,...)
Definition: internal.h:54
int h263_flv
use flv h263 header
Definition: mpegvideo.h:179
enum AVCodecID codec_id
Definition: avcodec.h:1258
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:199
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:441
main external API structure.
Definition: avcodec.h:1241
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:169
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1273
void * buf
Definition: avisynth_c.h:553
void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
Definition: mpegvideo.c:2370
#define SLICE_END
end marker found
Definition: mpegvideo.h:563
Picture * picture
main picture buffer
Definition: mpegvideo.h:205
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:467
int extradata_size
Definition: avcodec.h:1356
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
int coded_height
Definition: avcodec.h:1424
struct AVFrame * f
Definition: mpegvideo.h:90
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: pixfmt.h:211
int context_initialized
Definition: mpegvideo.h:193
int slice_height
in macroblocks
Definition: mpegvideo.h:496
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:873
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:1611
#define MV_DIR_FORWARD
Definition: mpegvideo.h:329
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:281
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:174
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:62
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:209
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
Definition: frame.c:505
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:182
qpel_mc_func(* qpel_avg)[16]
Definition: motion_est.h:82
the normal 219*2^(n-8) "MPEG" YUV ranges
Definition: pixfmt.h:522
MpegEncContext.
Definition: mpegvideo.h:150
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:252
struct AVCodecContext * avctx
Definition: mpegvideo.h:167
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:522
discard all non reference
Definition: avcodec.h:665
int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
Definition: mpegvideo.c:1577
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:85
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:63
Y , 8bpp.
Definition: pixfmt.h:71
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:199
void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
Definition: mpegvideo.c:1059
#define CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:738
const uint8_t * buffer_end
Definition: get_bits.h:55
int ff_wmv2_decode_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:120
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:719
Picture * last_picture_ptr
pointer to the previous picture.
Definition: mpegvideo.h:251
Bi-dir predicted.
Definition: avutil.h:269
#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:1283
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:1234
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1838
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:423
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:558
ParseContext parse_context
Definition: mpegvideo.h:428
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:237
int height
Definition: frame.h:220
void INT64 start
Definition: avisynth_c.h:553
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:188
#define FRAME_SKIPPED
return value for header parsers if frame is not coded
Definition: mpegvideo.h:59
mpeg1 4:2:0, jpeg 4:2:0, h263 4:2:0
Definition: pixfmt.h:545
#define ER_AC_END
int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
Find the end of the current frame in the bitstream.
av_cold void ff_qpeldsp_init(QpelDSPContext *c)
Definition: qpeldsp.c:783
#define FFSWAP(type, a, b)
Definition: common.h:69
#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:3365
int ff_h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
Definition: h263_parser.c:30
#define AV_EF_BUFFER
detect improper bitstream length
Definition: avcodec.h:2622
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:3376
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:85
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
This structure stores compressed data.
Definition: avcodec.h:1139
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:3254
#define MAX_NVOP_SIZE
Definition: mpeg4video.h:63
static int width