Libav
h263dec.c
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1 /*
2  * H.263 decoder
3  * Copyright (c) 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
28 #include "libavutil/cpu.h"
29 #include "avcodec.h"
30 #include "error_resilience.h"
31 #include "flv.h"
32 #include "h263.h"
33 #include "h263_parser.h"
34 #include "internal.h"
35 #include "mpeg4video.h"
36 #include "mpeg4video_parser.h"
37 #include "mpegvideo.h"
38 #include "msmpeg4.h"
39 #include "thread.h"
40 
42 {
43  MpegEncContext *s = avctx->priv_data;
44  int ret;
45 
46  s->avctx = avctx;
47  s->out_format = FMT_H263;
48  s->width = avctx->coded_width;
49  s->height = avctx->coded_height;
50  s->workaround_bugs = avctx->workaround_bugs;
51 
52  // set defaults
54  s->quant_precision = 5;
56  s->low_delay = 1;
57  if (avctx->codec->id == AV_CODEC_ID_MSS2)
58  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
59  else
60  avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
61  s->unrestricted_mv = 1;
62 
63  /* select sub codec */
64  switch (avctx->codec->id) {
65  case AV_CODEC_ID_H263:
66  s->unrestricted_mv = 0;
68  break;
69  case AV_CODEC_ID_MPEG4:
70  break;
72  s->h263_pred = 1;
73  s->msmpeg4_version = 1;
74  break;
76  s->h263_pred = 1;
77  s->msmpeg4_version = 2;
78  break;
80  s->h263_pred = 1;
81  s->msmpeg4_version = 3;
82  break;
83  case AV_CODEC_ID_WMV1:
84  s->h263_pred = 1;
85  s->msmpeg4_version = 4;
86  break;
87  case AV_CODEC_ID_WMV2:
88  s->h263_pred = 1;
89  s->msmpeg4_version = 5;
90  break;
91  case AV_CODEC_ID_VC1:
92  case AV_CODEC_ID_WMV3:
95  case AV_CODEC_ID_MSS2:
96  s->h263_pred = 1;
97  s->msmpeg4_version = 6;
99  break;
100  case AV_CODEC_ID_H263I:
101  break;
102  case AV_CODEC_ID_FLV1:
103  s->h263_flv = 1;
104  break;
105  default:
106  av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
107  avctx->codec->id);
108  return AVERROR(ENOSYS);
109  }
110  s->codec_id = avctx->codec->id;
111  avctx->hwaccel = ff_find_hwaccel(avctx);
112 
113  /* for h263, we allocate the images after having read the header */
114  if (avctx->codec->id != AV_CODEC_ID_H263 &&
115  avctx->codec->id != AV_CODEC_ID_MPEG4)
116  if ((ret = ff_MPV_common_init(s)) < 0)
117  return ret;
118 
121 
122  return 0;
123 }
124 
126 {
127  MpegEncContext *s = avctx->priv_data;
128 
130  return 0;
131 }
132 
136 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
137 {
138  int pos = (get_bits_count(&s->gb) + 7) >> 3;
139 
140  if (s->divx_packed || s->avctx->hwaccel) {
141  /* We would have to scan through the whole buf to handle the weird
142  * reordering ... */
143  return buf_size;
144  } else if (s->flags & CODEC_FLAG_TRUNCATED) {
145  pos -= s->parse_context.last_index;
146  // padding is not really read so this might be -1
147  if (pos < 0)
148  pos = 0;
149  return pos;
150  } else {
151  // avoid infinite loops (maybe not needed...)
152  if (pos == 0)
153  pos = 1;
154  // oops ;)
155  if (pos + 10 > buf_size)
156  pos = buf_size;
157 
158  return pos;
159  }
160 }
161 
163 {
164  const int part_mask = s->partitioned_frame
165  ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
166  const int mb_size = 16;
167  int ret;
168 
169  s->last_resync_gb = s->gb;
170  s->first_slice_line = 1;
171  s->resync_mb_x = s->mb_x;
172  s->resync_mb_y = s->mb_y;
173 
174  ff_set_qscale(s, s->qscale);
175 
176  if (s->avctx->hwaccel) {
177  const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
178  const uint8_t *end = ff_h263_find_resync_marker(start + 1,
179  s->gb.buffer_end);
180  skip_bits_long(&s->gb, 8 * (end - start));
181  return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
182  }
183 
184  if (s->partitioned_frame) {
185  const int qscale = s->qscale;
186 
188  if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
189  return ret;
190 
191  /* restore variables which were modified */
192  s->first_slice_line = 1;
193  s->mb_x = s->resync_mb_x;
194  s->mb_y = s->resync_mb_y;
195  ff_set_qscale(s, qscale);
196  }
197 
198  for (; s->mb_y < s->mb_height; s->mb_y++) {
199  /* per-row end of slice checks */
200  if (s->msmpeg4_version) {
201  if (s->resync_mb_y + s->slice_height == s->mb_y) {
203  s->mb_x - 1, s->mb_y, ER_MB_END);
204 
205  return 0;
206  }
207  }
208 
209  if (s->msmpeg4_version == 1) {
210  s->last_dc[0] =
211  s->last_dc[1] =
212  s->last_dc[2] = 128;
213  }
214 
216  for (; s->mb_x < s->mb_width; s->mb_x++) {
217  int ret;
218 
220 
221  if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
222  s->first_slice_line = 0;
223 
224  /* DCT & quantize */
225 
226  s->mv_dir = MV_DIR_FORWARD;
227  s->mv_type = MV_TYPE_16X16;
228  av_dlog(s, "%d %d %06X\n",
229  ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
230  ret = s->decode_mb(s, s->block);
231 
232  if (s->pict_type != AV_PICTURE_TYPE_B)
234 
235  if (ret < 0) {
236  const int xy = s->mb_x + s->mb_y * s->mb_stride;
237  if (ret == SLICE_END) {
238  ff_MPV_decode_mb(s, s->block);
239  if (s->loop_filter)
241 
243  s->mb_x, s->mb_y, ER_MB_END & part_mask);
244 
245  s->padding_bug_score--;
246 
247  if (++s->mb_x >= s->mb_width) {
248  s->mb_x = 0;
249  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
251  s->mb_y++;
252  }
253  return 0;
254  } else if (ret == SLICE_NOEND) {
256  "Slice mismatch at MB: %d\n", xy);
258  s->mb_x + 1, s->mb_y,
259  ER_MB_END & part_mask);
260  return AVERROR_INVALIDDATA;
261  }
262  av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
264  s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
265 
266  return AVERROR_INVALIDDATA;
267  }
268 
269  ff_MPV_decode_mb(s, s->block);
270  if (s->loop_filter)
272  }
273 
274  ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
276 
277  s->mb_x = 0;
278  }
279 
280  assert(s->mb_x == 0 && s->mb_y == s->mb_height);
281 
282  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
284  get_bits_left(&s->gb) >= 48 &&
285  show_bits(&s->gb, 24) == 0x4010 &&
286  !s->data_partitioning)
287  s->padding_bug_score += 32;
288 
289  /* try to detect the padding bug */
290  if (s->codec_id == AV_CODEC_ID_MPEG4 &&
292  get_bits_left(&s->gb) >= 0 &&
293  get_bits_left(&s->gb) < 48 &&
294  !s->data_partitioning) {
295  const int bits_count = get_bits_count(&s->gb);
296  const int bits_left = s->gb.size_in_bits - bits_count;
297 
298  if (bits_left == 0) {
299  s->padding_bug_score += 16;
300  } else if (bits_left != 1) {
301  int v = show_bits(&s->gb, 8);
302  v |= 0x7F >> (7 - (bits_count & 7));
303 
304  if (v == 0x7F && bits_left <= 8)
305  s->padding_bug_score--;
306  else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
307  bits_left <= 16)
308  s->padding_bug_score += 4;
309  else
310  s->padding_bug_score++;
311  }
312  }
313 
315  if (s->padding_bug_score > -2 && !s->data_partitioning)
317  else
319  }
320 
321  // handle formats which don't have unique end markers
322  if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
323  int left = get_bits_left(&s->gb);
324  int max_extra = 7;
325 
326  /* no markers in M$ crap */
328  max_extra += 17;
329 
330  /* buggy padding but the frame should still end approximately at
331  * the bitstream end */
332  if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
334  max_extra += 48;
335  else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
336  max_extra += 256 * 256 * 256 * 64;
337 
338  if (left > max_extra)
340  "discarding %d junk bits at end, next would be %X\n",
341  left, show_bits(&s->gb, 24));
342  else if (left < 0)
343  av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
344  else
346  s->mb_x - 1, s->mb_y, ER_MB_END);
347 
348  return 0;
349  }
350 
352  "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
353  get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
354 
355  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
356  ER_MB_END & part_mask);
357 
358  return AVERROR_INVALIDDATA;
359 }
360 
361 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
362  AVPacket *avpkt)
363 {
364  const uint8_t *buf = avpkt->data;
365  int buf_size = avpkt->size;
366  MpegEncContext *s = avctx->priv_data;
367  int ret;
368  AVFrame *pict = data;
369 
370  s->flags = avctx->flags;
371  s->flags2 = avctx->flags2;
372 
373  /* no supplementary picture */
374  if (buf_size == 0) {
375  /* special case for last picture */
376  if (s->low_delay == 0 && s->next_picture_ptr) {
377  if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
378  return ret;
379  s->next_picture_ptr = NULL;
380 
381  *got_frame = 1;
382  }
383 
384  return 0;
385  }
386 
387  if (s->flags & CODEC_FLAG_TRUNCATED) {
388  int next;
389 
391  next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
392  } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
393  next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
394  } else {
396  "this codec does not support truncated bitstreams\n");
397  return AVERROR(ENOSYS);
398  }
399 
400  if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
401  &buf_size) < 0)
402  return buf_size;
403  }
404 
405  if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder
406  ret = init_get_bits8(&s->gb, s->bitstream_buffer,
408  else
409  ret = init_get_bits8(&s->gb, buf, buf_size);
410  s->bitstream_buffer_size = 0;
411 
412  if (ret < 0)
413  return ret;
414 
415  if (!s->context_initialized)
416  // we need the idct permutaton for reading a custom matrix
417  if ((ret = ff_MPV_common_init(s)) < 0)
418  return ret;
419 
420  /* We need to set current_picture_ptr before reading the header,
421  * otherwise we cannot store anyting in there */
422  if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
423  int i = ff_find_unused_picture(s, 0);
424  if (i < 0)
425  return i;
426  s->current_picture_ptr = &s->picture[i];
427  }
428 
429  /* let's go :-) */
430  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
432  } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
434  } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
435  if (s->avctx->extradata_size && s->picture_number == 0) {
436  GetBitContext gb;
437 
438  ret = init_get_bits8(&gb, s->avctx->extradata,
439  s->avctx->extradata_size);
440  if (ret < 0)
441  return ret;
443  }
444  ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
445  } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
447  } else if (CONFIG_FLV_DECODER && s->h263_flv) {
449  } else {
451  }
452 
453  if (ret == FRAME_SKIPPED)
454  return get_consumed_bytes(s, buf_size);
455 
456  /* skip if the header was thrashed */
457  if (ret < 0) {
458  av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
459  return ret;
460  }
461 
462  avctx->has_b_frames = !s->low_delay;
463 
464 #define SET_QPEL_FUNC(postfix1, postfix2) \
465  s->dsp.put_ ## postfix1 = ff_put_ ## postfix2; \
466  s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
467  s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
468 
469  if (s->workaround_bugs & FF_BUG_STD_QPEL) {
470  SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
471  SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
472  SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
473  SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
474  SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
475  SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
476 
477  SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
478  SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
479  SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
480  SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
481  SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
482  SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
483  }
484 
485  /* After H263 & mpeg4 header decode we have the height, width,
486  * and other parameters. So then we could init the picture.
487  * FIXME: By the way H263 decoder is evolving it should have
488  * an H263EncContext */
489  if (s->width != avctx->coded_width ||
490  s->height != avctx->coded_height ||
491  s->context_reinit) {
492  /* H.263 could change picture size any time */
493  s->context_reinit = 0;
494 
495  ret = ff_set_dimensions(avctx, s->width, s->height);
496  if (ret < 0)
497  return ret;
498 
499  if ((ret = ff_MPV_common_frame_size_change(s)))
500  return ret;
501  }
502 
503  if (s->codec_id == AV_CODEC_ID_H263 ||
504  s->codec_id == AV_CODEC_ID_H263P ||
507 
508  // for skipping the frame
511 
512  /* skip B-frames if we don't have reference frames */
513  if (s->last_picture_ptr == NULL &&
514  (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
515  return get_consumed_bytes(s, buf_size);
516  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
517  s->pict_type == AV_PICTURE_TYPE_B) ||
518  (avctx->skip_frame >= AVDISCARD_NONKEY &&
519  s->pict_type != AV_PICTURE_TYPE_I) ||
520  avctx->skip_frame >= AVDISCARD_ALL)
521  return get_consumed_bytes(s, buf_size);
522 
523  if (s->next_p_frame_damaged) {
524  if (s->pict_type == AV_PICTURE_TYPE_B)
525  return get_consumed_bytes(s, buf_size);
526  else
527  s->next_p_frame_damaged = 0;
528  }
529 
530  if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
533  } else {
536  }
537 
538  if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
539  return ret;
540 
541  if (!s->divx_packed && !avctx->hwaccel)
542  ff_thread_finish_setup(avctx);
543 
544  if (avctx->hwaccel) {
545  ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
546  s->gb.buffer_end - s->gb.buffer);
547  if (ret < 0 )
548  return ret;
549  }
550 
552 
553  /* the second part of the wmv2 header contains the MB skip bits which
554  * are stored in current_picture->mb_type which is not available before
555  * ff_MPV_frame_start() */
556  if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
558  if (ret < 0)
559  return ret;
560  if (ret == 1)
561  goto intrax8_decoded;
562  }
563 
564  /* decode each macroblock */
565  s->mb_x = 0;
566  s->mb_y = 0;
567 
568  ret = decode_slice(s);
569  while (s->mb_y < s->mb_height) {
570  if (s->msmpeg4_version) {
571  if (s->slice_height == 0 || s->mb_x != 0 ||
572  (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
573  break;
574  } else {
575  int prev_x = s->mb_x, prev_y = s->mb_y;
576  if (ff_h263_resync(s) < 0)
577  break;
578  if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
579  s->er.error_occurred = 1;
580  }
581 
582  if (s->msmpeg4_version < 4 && s->h263_pred)
584 
585  if (decode_slice(s) < 0)
586  ret = AVERROR_INVALIDDATA;
587  }
588 
589  if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
591  if (!CONFIG_MSMPEG4_DECODER ||
592  ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
594 
595  assert(s->bitstream_buffer_size == 0);
596 
598  ff_mpeg4_frame_end(avctx, buf, buf_size);
599 
600 intrax8_decoded:
601  ff_er_frame_end(&s->er);
602 
603  if (avctx->hwaccel) {
604  ret = avctx->hwaccel->end_frame(avctx);
605  if (ret < 0)
606  return ret;
607  }
608 
609  ff_MPV_frame_end(s);
610 
611  if (!s->divx_packed && avctx->hwaccel)
612  ff_thread_finish_setup(avctx);
613 
614  assert(s->current_picture.f.pict_type ==
616  assert(s->current_picture.f.pict_type == s->pict_type);
617  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
618  if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
619  return ret;
621  } else if (s->last_picture_ptr != NULL) {
622  if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
623  return ret;
625  }
626 
627  if (s->last_picture_ptr || s->low_delay)
628  *got_frame = 1;
629 
630  if (ret && (avctx->err_recognition & AV_EF_EXPLODE))
631  return ret;
632  else
633  return get_consumed_bytes(s, buf_size);
634 }
635 
637 #if CONFIG_VAAPI
639 #endif
640 #if CONFIG_VDPAU
642 #endif
645 };
646 
648  .name = "h263",
649  .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
650  .type = AVMEDIA_TYPE_VIDEO,
651  .id = AV_CODEC_ID_H263,
652  .priv_data_size = sizeof(MpegEncContext),
656  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
658  .flush = ff_mpeg_flush,
660 };
int bitstream_buffer_size
Definition: mpegvideo.h:602
const struct AVCodec * codec
Definition: avcodec.h:1063
discard all frames except keyframes
Definition: avcodec.h:545
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2372
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:2903
int picture_number
Definition: mpegvideo.h:298
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
This structure describes decoded (raw) audio or video data.
Definition: frame.h:107
mpeg2/4, h264 default
Definition: avcodec.h:607
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1227
av_cold int ff_MPV_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:1205
#define SLICE_NOEND
no end marker or error found but mb count exceeded
Definition: mpegvideo.h:683
#define ER_MB_END
void ff_MPV_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:2477
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:144
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:199
static int decode_slice(MpegEncContext *s)
Definition: h263dec.c:162
#define CODEC_CAP_TRUNCATED
Definition: avcodec.h:712
void ff_er_frame_end(ERContext *s)
int msmpeg4_version
0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
Definition: mpegvideo.h:622
av_cold void ff_h263dsp_init(H263DSPContext *ctx)
Definition: h263dsp.c:117
int size
Definition: avcodec.h:974
uint8_t * bitstream_buffer
Definition: mpegvideo.h:601
enum AVCodecID codec_id
Definition: mpegvideo.h:280
#define AV_EF_BUFFER
Definition: avcodec.h:2400
HW decoding through VA API, Picture.data[3] contains a vaapi_render_state struct which contains the b...
Definition: pixfmt.h:127
const uint8_t * buffer
Definition: get_bits.h:54
void ff_print_debug_info(MpegEncContext *s, Picture *p)
Print debugging info for the given picture.
Definition: mpegvideo.c:1864
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1247
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
mpegvideo header.
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
discard all
Definition: avcodec.h:546
int padding_bug_score
used to detect the VERY common padding bug in MPEG4
Definition: mpegvideo.h:597
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:305
AVCodec.
Definition: avcodec.h:2755
int qscale
QP.
Definition: mpegvideo.h:392
int quant_precision
Definition: mpegvideo.h:585
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:598
enum AVDiscard skip_frame
Definition: avcodec.h:2701
void ff_mpeg4_clean_buffers(MpegEncContext *s)
Definition: mpeg4video.c:44
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2417
#define CONFIG_WMV2_DECODER
Definition: config.h:556
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo.c:2365
int context_reinit
Definition: mpegvideo.h:717
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:269
int ff_MPV_common_frame_size_change(MpegEncContext *s)
Definition: mpegvideo.c:1363
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:101
#define CONFIG_FLV_DECODER
Definition: config.h:442
uint8_t
#define av_cold
Definition: attributes.h:66
enum OutputFormat out_format
output format
Definition: mpegvideo.h:272
Multithreading support functions.
#define ER_MB_ERROR
qpel_mc_func(* qpel_put)[16]
Definition: mpegvideo.h:251
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:174
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1162
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:459
int ff_intel_h263_decode_picture_header(MpegEncContext *s)
Definition: intelh263dec.c:25
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:366
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:546
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:711
mpeg1, jpeg, h263
Definition: avcodec.h:608
const char data[16]
Definition: mxf.c:66
uint8_t * data
Definition: avcodec.h:973
#define FF_BUG_STD_QPEL
Definition: avcodec.h:2306
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
int flags2
AVCodecContext.flags2.
Definition: mpegvideo.h:284
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:300
void ff_MPV_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1843
void ff_thread_finish_setup(AVCodecContext *avctx)
If the codec defines update_thread_context(), call this when they are ready for the next thread to st...
int ff_wmv2_decode_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:113
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1761
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:832
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: dsputil.h:184
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2463
const uint8_t * ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end)
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:555
enum AVCodecID id
Definition: avcodec.h:2769
H263DSPContext h263dsp
Definition: mpegvideo.h:414
#define CODEC_FLAG_TRUNCATED
Definition: avcodec.h:679
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1332
int last_dc[3]
last DC values for MPEG1
Definition: mpegvideo.h:371
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
#define CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:740
int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
Combine the (truncated) bitstream to a complete frame.
Definition: parser.c:217
int partitioned_frame
is current frame partitioned
Definition: mpegvideo.h:590
#define AVERROR(e)
Definition: error.h:43
qpel_mc_func avg_qpel_pixels_tab[2][16]
Definition: dsputil.h:185
AVCodec ff_h263_decoder
Definition: h263dec.c:647
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:408
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:142
ERContext er
Definition: mpegvideo.h:719
int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:133
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1142
#define FF_BUG_NO_PADDING
Definition: avcodec.h:2300
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
const char * name
Name of the codec implementation.
Definition: avcodec.h:2762
int low_delay
no reordering needed / has no b-frames
Definition: mpegvideo.h:591
GetBitContext gb
Definition: mpegvideo.h:632
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:679
int ff_flv_decode_picture_header(MpegEncContext *s)
Definition: flvdec.c:36
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2433
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:544
uint8_t * error_status_table
#define ER_AC_ERROR
void ff_h263_loop_filter(MpegEncContext *s)
Definition: h263.c:138
int err_recognition
Definition: mpegvideo.h:549
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:2776
void ff_mpeg_er_frame_start(MpegEncContext *s)
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:168
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2390
#define CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:705
int ff_h263_get_gob_height(MpegEncContext *s)
Get the GOB height based on picture height.
Definition: h263.c:374
static int get_consumed_bytes(MpegEncContext *s, int buf_size)
Return the number of bytes consumed for building the current frame.
Definition: h263dec.c:136
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:548
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:370
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode mpeg4 headers.
int size_in_bits
Definition: get_bits.h:56
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:254
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size)
Definition: msmpeg4dec.c:544
MotionEstContext me
Definition: mpegvideo.h:457
#define AV_EF_EXPLODE
Definition: avcodec.h:2401
#define SET_QPEL_FUNC(postfix1, postfix2)
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:361
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:1628
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:125
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:441
int first_slice_line
used in mpeg4 too to handle resync markers
Definition: mpegvideo.h:620
NULL
Definition: eval.c:55
Libavcodec external API header.
void ff_h263_update_motion_val(MpegEncContext *s)
Definition: h263.c:45
int h263_flv
use flv h263 header
Definition: mpegvideo.h:278
enum AVCodecID codec_id
Definition: avcodec.h:1065
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:408
main external API structure.
Definition: avcodec.h:1054
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:489
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:268
#define SLICE_END
end marker found
Definition: mpegvideo.h:682
Picture * picture
main picture buffer
Definition: mpegvideo.h:308
int data_partitioning
data partitioning flag from header
Definition: mpegvideo.h:589
int extradata_size
Definition: avcodec.h:1163
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
void ff_MPV_decode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:2304
int coded_height
Definition: avcodec.h:1227
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
Definition: avcodec.h:1294
#define CONFIG_MPEG4_DECODER
Definition: config.h:479
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: pixfmt.h:187
int context_initialized
Definition: mpegvideo.h:295
#define CONFIG_H263I_DECODER
Definition: config.h:450
int slice_height
in macroblocks
Definition: mpegvideo.h:619
DSPContext dsp
pointers for accelerated dsp functions
Definition: mpegvideo.h:411
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:866
#define MV_DIR_FORWARD
Definition: mpegvideo.h:437
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:399
#define FF_BUG_AUTODETECT
autodetection
Definition: avcodec.h:2294
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:273
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:41
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:227
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:113
qpel_mc_func(* qpel_avg)[16]
Definition: mpegvideo.h:252
MpegEncContext.
Definition: mpegvideo.h:264
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:369
struct AVCodecContext * avctx
Definition: mpegvideo.h:266
discard all non reference
Definition: avcodec.h:543
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
common internal api header.
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:301
#define CONFIG_H263_DECODER
Definition: config.h:449
static av_cold void flush(AVCodecContext *avctx)
Flush (reset) the frame ID after seeking.
Definition: alsdec.c:1766
const uint8_t * buffer_end
Definition: get_bits.h:54
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:636
Picture * last_picture_ptr
pointer to the previous picture.
Definition: mpegvideo.h:368
Bi-dir predicted.
Definition: avutil.h:255
int workaround_bugs
Work around bugs in encoders which sometimes cannot be detected automatically.
Definition: avcodec.h:2293
AVHWAccel * ff_find_hwaccel(AVCodecContext *avctx)
Return the hardware accelerated codec for codec codec_id and pixel format pix_fmt.
Definition: utils.c:2177
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:498
void * priv_data
Definition: avcodec.h:1090
void ff_MPV_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1436
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:545
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:677
ParseContext parse_context
Definition: mpegvideo.h:551
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:163
int flags2
CODEC_FLAG2_*.
Definition: avcodec.h:1149
struct AVFrame f
Definition: mpegvideo.h:100
int flags
AVCodecContext.flags (HQ, MV4, ...)
Definition: mpegvideo.h:283
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:289
#define FRAME_SKIPPED
return value for header parsers if frame is not coded
Definition: mpegvideo.h:47
qpel_mc_func put_no_rnd_qpel_pixels_tab[2][16]
Definition: dsputil.h:186
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:389
#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.
#define CONFIG_MSMPEG4_DECODER
Definition: msmpeg4.h:59
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:2916
int ff_find_unused_picture(MpegEncContext *s, int shared)
Definition: mpegvideo.c:1610
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:2927
AVPixelFormat
Pixel format.
Definition: pixfmt.h:63
This structure stores compressed data.
Definition: avcodec.h:950
void ff_MPV_decode_defaults(MpegEncContext *s)
Set the given MpegEncContext to defaults for decoding.
Definition: mpegvideo.c:1019