FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
h263dec.c
Go to the documentation of this file.
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 & AV_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 H.263, 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 & AV_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 %06X\n",
253  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 & AV_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 permutation 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 H.263 & MPEG-4 header decode we have the height, width,
540  * and other parameters. So then we could init the picture.
541  * FIXME: By the way H.263 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 FF_API_CAP_VDPAU
607  if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & AV_CODEC_CAP_HWACCEL_VDPAU)) {
609  goto frame_end;
610  }
611 #endif
612 
613  if (avctx->hwaccel) {
614  ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
615  s->gb.buffer_end - s->gb.buffer);
616  if (ret < 0 )
617  return ret;
618  }
619 
621 
622  /* the second part of the wmv2 header contains the MB skip bits which
623  * are stored in current_picture->mb_type which is not available before
624  * ff_mpv_frame_start() */
625  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
627  if (ret < 0)
628  return ret;
629  if (ret == 1)
630  goto frame_end;
631  }
632 
633  /* decode each macroblock */
634  s->mb_x = 0;
635  s->mb_y = 0;
636 
637  slice_ret = decode_slice(s);
638  while (s->mb_y < s->mb_height) {
639  if (s->msmpeg4_version) {
640  if (s->slice_height == 0 || s->mb_x != 0 ||
641  (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
642  break;
643  } else {
644  int prev_x = s->mb_x, prev_y = s->mb_y;
645  if (ff_h263_resync(s) < 0)
646  break;
647  if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
648  s->er.error_occurred = 1;
649  }
650 
651  if (s->msmpeg4_version < 4 && s->h263_pred)
653 
654  if (decode_slice(s) < 0)
655  slice_ret = AVERROR_INVALIDDATA;
656  }
657 
658  if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
660  if (!CONFIG_MSMPEG4_DECODER ||
661  ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
663 
665 frame_end:
666  ff_er_frame_end(&s->er);
667 
668  if (avctx->hwaccel) {
669  ret = avctx->hwaccel->end_frame(avctx);
670  if (ret < 0)
671  return ret;
672  }
673 
674  ff_mpv_frame_end(s);
675 
676  if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
677  ff_mpeg4_frame_end(avctx, buf, buf_size);
678 
679  if (!s->divx_packed && avctx->hwaccel)
680  ff_thread_finish_setup(avctx);
681 
684  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
685  if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
686  return ret;
689  } else if (s->last_picture_ptr) {
690  if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
691  return ret;
694  }
695 
696  if (s->last_picture_ptr || s->low_delay) {
697  if ( pict->format == AV_PIX_FMT_YUV420P
698  && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
699  int x, y, p;
701  for (p=0; p<3; p++) {
702  int w = AV_CEIL_RSHIFT(pict-> width, !!p);
703  int h = AV_CEIL_RSHIFT(pict->height, !!p);
704  int linesize = pict->linesize[p];
705  for (y=0; y<(h>>1); y++)
706  for (x=0; x<w; x++)
707  FFSWAP(int,
708  pict->data[p][x + y*linesize],
709  pict->data[p][x + (h-1-y)*linesize]);
710  }
711  }
712  *got_frame = 1;
713  }
714 
715  if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
716  return ret;
717  else
718  return get_consumed_bytes(s, buf_size);
719 }
720 
722 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
724 #endif
725 #if CONFIG_MPEG4_VDPAU_HWACCEL
727 #endif
728 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
730 #endif
733 };
734 
736  .name = "h263",
737  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
738  .type = AVMEDIA_TYPE_VIDEO,
739  .id = AV_CODEC_ID_H263,
740  .priv_data_size = sizeof(MpegEncContext),
742  .close = ff_h263_decode_end,
746  .flush = ff_mpeg_flush,
747  .max_lowres = 3,
749 };
750 
752  .name = "h263p",
753  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
754  .type = AVMEDIA_TYPE_VIDEO,
755  .id = AV_CODEC_ID_H263P,
756  .priv_data_size = sizeof(MpegEncContext),
758  .close = ff_h263_decode_end,
762  .flush = ff_mpeg_flush,
763  .max_lowres = 3,
765 };
int bitstream_buffer_size
Definition: mpegvideo.h:414
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2960
#define ff_tlog(ctx,...)
Definition: internal.h:65
#define NULL
Definition: coverity.c:32
const struct AVCodec * codec
Definition: avcodec.h:1666
discard all frames except keyframes
Definition: avcodec.h:783
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2739
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:3735
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:631
#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:480
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
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:1859
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:503
#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:210
hardware decoding through Videotoolbox
Definition: pixfmt.h:295
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static int decode_slice(MpegEncContext *s)
Definition: h263dec.c:186
void ff_er_frame_end(ERContext *s)
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:2393
int msmpeg4_version
0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
Definition: mpegvideo.h:435
av_cold void ff_h263dsp_init(H263DSPContext *ctx)
Definition: h263dsp.c:117
int size
Definition: avcodec.h:1589
uint8_t * bitstream_buffer
Definition: mpegvideo.h:413
enum AVCodecID codec_id
Definition: mpegvideo.h:109
#define AV_EF_BUFFER
detect improper bitstream length
Definition: avcodec.h:2954
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:2068
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1885
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:552
mpegvideo header.
discard all
Definition: avcodec.h:784
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:409
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:130
QpelDSPContext qdsp
Definition: mpegvideo.h:232
AVCodec.
Definition: avcodec.h:3552
int qscale
QP.
Definition: mpegvideo.h:201
int quant_precision
Definition: mpegvideo.h:398
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:610
#define FF_QSCALE_TYPE_MPEG1
Definition: avcodec.h:1332
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:3274
void ff_mpeg4_clean_buffers(MpegEncContext *s)
Definition: mpeg4video.c:45
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2976
#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:981
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo.c:2732
int context_reinit
Definition: mpegvideo.h:548
static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
Definition: h263dec.c:48
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:108
uint8_t
#define av_cold
Definition: attributes.h:82
enum OutputFormat out_format
output format
Definition: mpegvideo.h:101
int ff_mpv_common_frame_size_change(MpegEncContext *s)
Definition: mpegvideo.c:1036
Multithreading support functions.
void ff_vdpau_mpeg4_decode_picture(Mpeg4DecContext *s, const uint8_t *buf, int buf_size)
#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:374
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1772
int no_rounding
apply no rounding to motion compensation (MPEG-4, msmpeg4, ...) for B-frames rounding mode is always ...
Definition: mpegvideo.h:284
void ff_mpv_decode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:2720
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:358
int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
Definition: mpegpicture.c:441
quarterpel DSP functions
uint8_t * data
Definition: avcodec.h:1588
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
#define AV_CODEC_CAP_HWACCEL_VDPAU
Codec can export data for HW decoding (VDPAU).
Definition: avcodec.h:992
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:225
#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:3067
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:858
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2400
#define av_log(a,...)
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:729
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2802
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:397
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:568
enum AVCodecID id
Definition: avcodec.h:3566
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:1979
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:245
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:403
#define AVERROR(e)
Definition: error.h:43
AVCodec ff_h263_decoder
Definition: h263dec.c:735
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:176
ERContext er
Definition: mpegvideo.h:550
int capabilities
Codec capabilities.
Definition: avcodec.h:3571
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1752
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2847
const char * name
Name of the codec implementation.
Definition: avcodec.h:3559
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:404
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:73
GetBitContext gb
Definition: mpegvideo.h:445
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:499
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1115
int ff_flv_decode_picture_header(MpegEncContext *s)
Definition: flvdec.c:28
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2771
static void frame_end(MpegEncContext *s)
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:356
uint8_t * error_status_table
#define ER_AC_ERROR
void ff_h263_loop_filter(MpegEncContext *s)
Definition: h263.c:135
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:950
int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type)
Definition: mpegvideo.c:1968
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3573
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:258
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2944
#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:160
int last_index
Definition: parser.h:31
int next_p_frame_damaged
set if the next p frame is damaged, to avoid showing trashed B-frames
Definition: mpegvideo.h:360
#define width
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:140
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:282
AVCodec ff_h263p_decoder
Definition: h263dec.c:751
MotionEstContext me
Definition: mpegvideo.h:282
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2955
#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:409
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:149
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
Definition: utils.c:1090
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:248
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
int first_slice_line
used in MPEG-4 too to handle resync markers
Definition: mpegvideo.h:433
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:1674
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:437
main external API structure.
Definition: avcodec.h:1657
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:1689
void * buf
Definition: avisynth_c.h:553
void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
Definition: mpegvideo.c:1961
#define SLICE_END
end marker found
Definition: mpegvideo.h:502
Picture * picture
main picture buffer
Definition: mpegvideo.h:133
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:402
int extradata_size
Definition: avcodec.h:1773
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
int coded_height
Definition: avcodec.h:1859
struct AVFrame * f
Definition: mpegpicture.h:46
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: pixfmt.h:208
int context_initialized
Definition: mpegvideo.h:121
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:2957
int slice_height
in macroblocks
Definition: mpegvideo.h:432
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:876
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:1189
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:262
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:957
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2841
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:62
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:212
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
Definition: frame.c:537
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
qpel_mc_func(* qpel_avg)[16]
Definition: motion_est.h:92
the normal 219*2^(n-8) "MPEG" YUV ranges
Definition: pixfmt.h:458
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
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:752
discard all non reference
Definition: avcodec.h:780
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
const uint8_t * buffer_end
Definition: get_bits.h:56
int ff_wmv2_decode_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:120
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:721
Picture * last_picture_ptr
pointer to the previous picture.
Definition: mpegvideo.h:179
Bi-dir predicted.
Definition: avutil.h:268
#define H263_GOB_HEIGHT(h)
Definition: h263.h:44
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
void * priv_data
Definition: avcodec.h:1699
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:1421
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:357
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:497
ParseContext parse_context
Definition: mpegvideo.h:362
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:253
#define AV_CODEC_FLAG_TRUNCATED
Input bitstream might be truncated at a random location instead of only at frame boundaries.
Definition: avcodec.h:867
int height
Definition: frame.h:236
void INT64 start
Definition: avisynth_c.h:553
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:481
#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:3749
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:3760
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:1565
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:2816
#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:956
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58