FFmpeg
iff.c
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1 /*
2  * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
3  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
4  * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
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  * IFF file demuxer
26  * by Jaikrishnan Menon
27  * for more information on the .iff file format, visit:
28  * http://wiki.multimedia.cx/index.php?title=IFF
29  */
30 
31 #include <inttypes.h>
32 
33 #include "libavutil/avassert.h"
35 #include "libavutil/intreadwrite.h"
36 #include "libavutil/dict.h"
37 #include "libavcodec/bytestream.h"
38 #include "avformat.h"
39 #include "id3v2.h"
40 #include "internal.h"
41 
42 #define ID_8SVX MKTAG('8','S','V','X')
43 #define ID_16SV MKTAG('1','6','S','V')
44 #define ID_MAUD MKTAG('M','A','U','D')
45 #define ID_MHDR MKTAG('M','H','D','R')
46 #define ID_MDAT MKTAG('M','D','A','T')
47 #define ID_VHDR MKTAG('V','H','D','R')
48 #define ID_ATAK MKTAG('A','T','A','K')
49 #define ID_RLSE MKTAG('R','L','S','E')
50 #define ID_CHAN MKTAG('C','H','A','N')
51 #define ID_PBM MKTAG('P','B','M',' ')
52 #define ID_ILBM MKTAG('I','L','B','M')
53 #define ID_BMHD MKTAG('B','M','H','D')
54 #define ID_DGBL MKTAG('D','G','B','L')
55 #define ID_CAMG MKTAG('C','A','M','G')
56 #define ID_CMAP MKTAG('C','M','A','P')
57 #define ID_ACBM MKTAG('A','C','B','M')
58 #define ID_DEEP MKTAG('D','E','E','P')
59 #define ID_RGB8 MKTAG('R','G','B','8')
60 #define ID_RGBN MKTAG('R','G','B','N')
61 #define ID_DSD MKTAG('D','S','D',' ')
62 #define ID_DST MKTAG('D','S','T',' ')
63 #define ID_DSTC MKTAG('D','S','T','C')
64 #define ID_DSTF MKTAG('D','S','T','F')
65 #define ID_FRTE MKTAG('F','R','T','E')
66 #define ID_ANIM MKTAG('A','N','I','M')
67 #define ID_ANHD MKTAG('A','N','H','D')
68 #define ID_DLTA MKTAG('D','L','T','A')
69 #define ID_DPAN MKTAG('D','P','A','N')
70 
71 #define ID_FORM MKTAG('F','O','R','M')
72 #define ID_FRM8 MKTAG('F','R','M','8')
73 #define ID_ANNO MKTAG('A','N','N','O')
74 #define ID_AUTH MKTAG('A','U','T','H')
75 #define ID_CHRS MKTAG('C','H','R','S')
76 #define ID_COPYRIGHT MKTAG('(','c',')',' ')
77 #define ID_CSET MKTAG('C','S','E','T')
78 #define ID_FVER MKTAG('F','V','E','R')
79 #define ID_NAME MKTAG('N','A','M','E')
80 #define ID_TEXT MKTAG('T','E','X','T')
81 #define ID_ABIT MKTAG('A','B','I','T')
82 #define ID_BODY MKTAG('B','O','D','Y')
83 #define ID_DBOD MKTAG('D','B','O','D')
84 #define ID_DPEL MKTAG('D','P','E','L')
85 #define ID_DLOC MKTAG('D','L','O','C')
86 #define ID_TVDC MKTAG('T','V','D','C')
87 
88 #define LEFT 2
89 #define RIGHT 4
90 #define STEREO 6
91 
92 /**
93  * This number of bytes if added at the beginning of each AVPacket
94  * which contain additional information about video properties
95  * which has to be shared between demuxer and decoder.
96  * This number may change between frames, e.g. the demuxer might
97  * set it to smallest possible size of 2 to indicate that there's
98  * no extradata changing in this frame.
99  */
100 #define IFF_EXTRA_VIDEO_SIZE 41
101 
102 typedef enum {
107 
108 typedef struct IffDemuxContext {
109  int is_64bit; ///< chunk size is 64-bit
110  int64_t body_pos;
111  int64_t body_end;
112  uint32_t body_size;
114  unsigned maud_bits;
116  unsigned bitmap_compression; ///< delta compression method used
117  unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
118  unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
119  unsigned flags; ///< 1 for EHB, 0 is no extra half darkening
120  unsigned transparency; ///< transparency color index in palette
121  unsigned masking; ///< masking method used
122  uint8_t tvdc[32]; ///< TVDC lookup table
123  int64_t pts;
125 
126 /* Metadata string read */
128  const char *const tag,
129  const unsigned data_size)
130 {
131  uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
132 
133  if (!buf)
134  return AVERROR(ENOMEM);
135 
136  if (avio_read(s->pb, buf, data_size) != data_size) {
137  av_free(buf);
138  return AVERROR(EIO);
139  }
140  buf[data_size] = 0;
142  return 0;
143 }
144 
145 static int iff_probe(const AVProbeData *p)
146 {
147  const uint8_t *d = p->buf;
148 
149  if ( (AV_RL32(d) == ID_FORM &&
150  (AV_RL32(d+8) == ID_8SVX ||
151  AV_RL32(d+8) == ID_16SV ||
152  AV_RL32(d+8) == ID_MAUD ||
153  AV_RL32(d+8) == ID_PBM ||
154  AV_RL32(d+8) == ID_ACBM ||
155  AV_RL32(d+8) == ID_DEEP ||
156  AV_RL32(d+8) == ID_ILBM ||
157  AV_RL32(d+8) == ID_RGB8 ||
158  AV_RL32(d+8) == ID_ANIM ||
159  AV_RL32(d+8) == ID_RGBN)) ||
160  (AV_RL32(d) == ID_FRM8 && AV_RL32(d+12) == ID_DSD))
161  return AVPROBE_SCORE_MAX;
162  return 0;
163 }
164 
165 static const AVCodecTag dsd_codec_tags[] = {
167  { AV_CODEC_ID_DST, ID_DST },
168  { AV_CODEC_ID_NONE, 0 },
169 };
170 
171 
172 #define DSD_SLFT MKTAG('S','L','F','T')
173 #define DSD_SRGT MKTAG('S','R','G','T')
174 #define DSD_MLFT MKTAG('M','L','F','T')
175 #define DSD_MRGT MKTAG('M','R','G','T')
176 #define DSD_C MKTAG('C',' ',' ',' ')
177 #define DSD_LS MKTAG('L','S',' ',' ')
178 #define DSD_RS MKTAG('R','S',' ',' ')
179 #define DSD_LFE MKTAG('L','F','E',' ')
180 
181 static const uint32_t dsd_stereo[] = { DSD_SLFT, DSD_SRGT };
182 static const uint32_t dsd_5point0[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LS, DSD_RS };
183 static const uint32_t dsd_5point1[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LFE, DSD_LS, DSD_RS };
184 
185 typedef struct {
186  uint64_t layout;
187  const uint32_t * dsd_layout;
188 } DSDLayoutDesc;
189 
194 };
195 
196 static const uint64_t dsd_loudspeaker_config[] = {
198  0, 0,
200 };
201 
202 static const char * dsd_source_comment[] = {
203  "dsd_source_comment",
204  "analogue_source_comment",
205  "pcm_source_comment",
206 };
207 
208 static const char * dsd_history_comment[] = {
209  "general_remark",
210  "operator_name",
211  "creating_machine",
212  "timezone",
213  "file_revision"
214 };
215 
216 static int parse_dsd_diin(AVFormatContext *s, AVStream *st, uint64_t eof)
217 {
218  AVIOContext *pb = s->pb;
219 
220  while (avio_tell(pb) + 12 <= eof && !avio_feof(pb)) {
221  uint32_t tag = avio_rl32(pb);
222  uint64_t size = avio_rb64(pb);
223  uint64_t orig_pos = avio_tell(pb);
224  const char * metadata_tag = NULL;
225 
226  if (size >= INT64_MAX)
227  return AVERROR_INVALIDDATA;
228 
229  switch(tag) {
230  case MKTAG('D','I','A','R'): metadata_tag = "artist"; break;
231  case MKTAG('D','I','T','I'): metadata_tag = "title"; break;
232  }
233 
234  if (metadata_tag && size > 4) {
235  unsigned int tag_size = avio_rb32(pb);
236  int ret = get_metadata(s, metadata_tag, FFMIN(tag_size, size - 4));
237  if (ret < 0) {
238  av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
239  return ret;
240  }
241  }
242 
243  avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
244  }
245 
246  return 0;
247 }
248 
249 static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)
250 {
251  AVIOContext *pb = s->pb;
252  char abss[24];
253  int hour, min, sec, i, ret, config;
254  int dsd_layout[6];
255  ID3v2ExtraMeta *id3v2_extra_meta;
256 
257  while (avio_tell(pb) + 12 <= eof && !avio_feof(pb)) {
258  uint32_t tag = avio_rl32(pb);
259  uint64_t size = avio_rb64(pb);
260  uint64_t orig_pos = avio_tell(pb);
261 
262  if (size >= INT64_MAX)
263  return AVERROR_INVALIDDATA;
264 
265  switch(tag) {
266  case MKTAG('A','B','S','S'):
267  if (size < 8)
268  return AVERROR_INVALIDDATA;
269  hour = avio_rb16(pb);
270  min = avio_r8(pb);
271  sec = avio_r8(pb);
272  snprintf(abss, sizeof(abss), "%02dh:%02dm:%02ds:%d", hour, min, sec, avio_rb32(pb));
273  av_dict_set(&st->metadata, "absolute_start_time", abss, 0);
274  break;
275 
276  case MKTAG('C','H','N','L'):
277  if (size < 2)
278  return AVERROR_INVALIDDATA;
279  st->codecpar->channels = avio_rb16(pb);
280  if (size < 2 + st->codecpar->channels * 4)
281  return AVERROR_INVALIDDATA;
282  st->codecpar->channel_layout = 0;
283  if (st->codecpar->channels > FF_ARRAY_ELEMS(dsd_layout)) {
284  avpriv_request_sample(s, "channel layout");
285  break;
286  }
287  for (i = 0; i < st->codecpar->channels; i++)
288  dsd_layout[i] = avio_rl32(pb);
289  for (i = 0; i < FF_ARRAY_ELEMS(dsd_channel_layout); i++) {
290  const DSDLayoutDesc * d = &dsd_channel_layout[i];
292  !memcmp(d->dsd_layout, dsd_layout, st->codecpar->channels * sizeof(uint32_t))) {
293  st->codecpar->channel_layout = d->layout;
294  break;
295  }
296  }
297  break;
298 
299  case MKTAG('C','M','P','R'):
300  if (size < 4)
301  return AVERROR_INVALIDDATA;
302  st->codecpar->codec_tag = tag = avio_rl32(pb);
303  st->codecpar->codec_id = ff_codec_get_id(dsd_codec_tags, tag);
304  if (!st->codecpar->codec_id) {
305  av_log(s, AV_LOG_ERROR, "'%s' compression is not supported\n",
306  av_fourcc2str(tag));
307  return AVERROR_PATCHWELCOME;
308  }
309  break;
310 
311  case MKTAG('F','S',' ',' '):
312  if (size < 4)
313  return AVERROR_INVALIDDATA;
314  st->codecpar->sample_rate = avio_rb32(pb) / 8;
315  break;
316 
317  case MKTAG('I','D','3',' '):
318  id3v2_extra_meta = NULL;
319  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
320  if (id3v2_extra_meta) {
321  if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0 ||
322  (ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0) {
323  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
324  return ret;
325  }
326  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
327  }
328 
329  if (size < avio_tell(pb) - orig_pos) {
330  av_log(s, AV_LOG_ERROR, "id3 exceeds chunk size\n");
331  return AVERROR_INVALIDDATA;
332  }
333  break;
334 
335  case MKTAG('L','S','C','O'):
336  if (size < 2)
337  return AVERROR_INVALIDDATA;
338  config = avio_rb16(pb);
339  if (config != 0xFFFF) {
342  if (!st->codecpar->channel_layout)
343  avpriv_request_sample(s, "loudspeaker configuration %d", config);
344  }
345  break;
346  }
347 
348  avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
349  }
350 
351  return 0;
352 }
353 
355 {
356  IffDemuxContext *iff = s->priv_data;
357  AVIOContext *pb = s->pb;
358  uint32_t chunk_id;
359  uint64_t chunk_pos, data_pos, data_size;
360  int ret = AVERROR_EOF;
361 
362  while (!avio_feof(pb)) {
363  chunk_pos = avio_tell(pb);
364  if (chunk_pos >= iff->body_end)
365  return AVERROR_EOF;
366 
367  chunk_id = avio_rl32(pb);
368  data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);
369  data_pos = avio_tell(pb);
370 
371  if (data_size < 1 || data_size >= INT64_MAX)
372  return AVERROR_INVALIDDATA;
373 
374  switch (chunk_id) {
375  case ID_DSTF:
376  if (!pkt) {
377  iff->body_pos = avio_tell(pb) - (iff->is_64bit ? 12 : 8);
378  iff->body_size = iff->body_end - iff->body_pos;
379  return 0;
380  }
381  ret = av_get_packet(pb, pkt, data_size);
382  if (ret < 0)
383  return ret;
384  if (data_size & 1)
385  avio_skip(pb, 1);
386  pkt->flags |= AV_PKT_FLAG_KEY;
387  pkt->stream_index = 0;
388  pkt->duration = 588 * s->streams[0]->codecpar->sample_rate / 44100;
389  pkt->pos = chunk_pos;
390 
391  chunk_pos = avio_tell(pb);
392  if (chunk_pos >= iff->body_end)
393  return 0;
394 
395  avio_seek(pb, chunk_pos, SEEK_SET);
396  return 0;
397 
398  case ID_FRTE:
399  if (data_size < 4)
400  return AVERROR_INVALIDDATA;
401  s->streams[0]->duration = avio_rb32(pb) * 588LL * s->streams[0]->codecpar->sample_rate / 44100;
402  break;
403  }
404 
405  avio_skip(pb, data_size - (avio_tell(pb) - data_pos) + (data_size & 1));
406  }
407 
408  return ret;
409 }
410 
411 static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
412 static const uint8_t deep_rgba[] = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
413 static const uint8_t deep_bgra[] = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};
414 static const uint8_t deep_argb[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};
415 static const uint8_t deep_abgr[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};
416 
418 {
419  IffDemuxContext *iff = s->priv_data;
420  AVIOContext *pb = s->pb;
421  AVStream *st;
422  uint8_t *buf;
423  uint32_t chunk_id;
424  uint64_t data_size;
425  uint32_t screenmode = 0, num, den;
426  unsigned transparency = 0;
427  unsigned masking = 0; // no mask
428  uint8_t fmt[16];
429  int fmt_size;
430 
431  st = avformat_new_stream(s, NULL);
432  if (!st)
433  return AVERROR(ENOMEM);
434 
435  st->codecpar->channels = 1;
437  iff->is_64bit = avio_rl32(pb) == ID_FRM8;
438  avio_skip(pb, iff->is_64bit ? 8 : 4);
439  // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
440  st->codecpar->codec_tag = avio_rl32(pb);
441  if (st->codecpar->codec_tag == ID_ANIM) {
442  avio_skip(pb, 12);
443  }
444  iff->bitmap_compression = -1;
445  iff->svx8_compression = -1;
446  iff->maud_bits = -1;
447  iff->maud_compression = -1;
448 
449  while(!avio_feof(pb)) {
450  uint64_t orig_pos;
451  int res;
452  const char *metadata_tag = NULL;
453  int version, nb_comments, i;
454  chunk_id = avio_rl32(pb);
455  data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);
456  orig_pos = avio_tell(pb);
457 
458  if (data_size >= INT64_MAX)
459  return AVERROR_INVALIDDATA;
460 
461  switch(chunk_id) {
462  case ID_VHDR:
464 
465  if (data_size < 14)
466  return AVERROR_INVALIDDATA;
467  avio_skip(pb, 12);
468  st->codecpar->sample_rate = avio_rb16(pb);
469  if (data_size >= 16) {
470  avio_skip(pb, 1);
471  iff->svx8_compression = avio_r8(pb);
472  }
473  break;
474 
475  case ID_MHDR:
477 
478  if (data_size < 32)
479  return AVERROR_INVALIDDATA;
480  avio_skip(pb, 4);
481  iff->maud_bits = avio_rb16(pb);
482  avio_skip(pb, 2);
483  num = avio_rb32(pb);
484  den = avio_rb16(pb);
485  if (!den)
486  return AVERROR_INVALIDDATA;
487  avio_skip(pb, 2);
488  st->codecpar->sample_rate = num / den;
489  st->codecpar->channels = avio_rb16(pb);
490  iff->maud_compression = avio_rb16(pb);
491  if (st->codecpar->channels == 1)
493  else if (st->codecpar->channels == 2)
495  break;
496 
497  case ID_ABIT:
498  case ID_BODY:
499  case ID_DBOD:
500  case ID_DSD:
501  case ID_DST:
502  case ID_MDAT:
503  iff->body_pos = avio_tell(pb);
504  iff->body_end = iff->body_pos + data_size;
505  iff->body_size = data_size;
506  if (chunk_id == ID_DST) {
507  int ret = read_dst_frame(s, NULL);
508  if (ret < 0)
509  return ret;
510  }
511  break;
512 
513  case ID_CHAN:
514  if (data_size < 4)
515  return AVERROR_INVALIDDATA;
516  if (avio_rb32(pb) < 6) {
517  st->codecpar->channels = 1;
519  } else {
520  st->codecpar->channels = 2;
522  }
523  break;
524 
525  case ID_CAMG:
526  if (data_size < 4)
527  return AVERROR_INVALIDDATA;
528  screenmode = avio_rb32(pb);
529  break;
530 
531  case ID_CMAP:
532  if (data_size < 3 || data_size > 768 || data_size % 3) {
533  av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %"PRIu64"\n",
534  data_size);
535  return AVERROR_INVALIDDATA;
536  }
537  res = ff_alloc_extradata(st->codecpar,
538  data_size + IFF_EXTRA_VIDEO_SIZE);
539  if (res < 0)
540  return res;
541  if (avio_read(pb, st->codecpar->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0) {
542  av_freep(&st->codecpar->extradata);
543  st->codecpar->extradata_size = 0;
544  return AVERROR(EIO);
545  }
546  break;
547 
548  case ID_BMHD:
550  if (data_size <= 8)
551  return AVERROR_INVALIDDATA;
552  st->codecpar->width = avio_rb16(pb);
553  st->codecpar->height = avio_rb16(pb);
554  avio_skip(pb, 4); // x, y offset
556  if (data_size >= 10)
557  masking = avio_r8(pb);
558  if (data_size >= 11)
559  iff->bitmap_compression = avio_r8(pb);
560  if (data_size >= 14) {
561  avio_skip(pb, 1); // padding
562  transparency = avio_rb16(pb);
563  }
564  if (data_size >= 16) {
565  st->sample_aspect_ratio.num = avio_r8(pb);
566  st->sample_aspect_ratio.den = avio_r8(pb);
567  }
568  break;
569 
570  case ID_ANHD:
571  break;
572 
573  case ID_DPAN:
574  avio_skip(pb, 2);
575  st->duration = avio_rb16(pb);
576  break;
577 
578  case ID_DPEL:
579  if (data_size < 4 || (data_size & 3))
580  return AVERROR_INVALIDDATA;
581  if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)
582  return fmt_size;
583  if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))
585  else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))
587  else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))
589  else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))
591  else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))
593  else {
594  avpriv_request_sample(s, "color format %.16s", fmt);
595  return AVERROR_PATCHWELCOME;
596  }
597  break;
598 
599  case ID_DGBL:
601  if (data_size < 8)
602  return AVERROR_INVALIDDATA;
603  st->codecpar->width = avio_rb16(pb);
604  st->codecpar->height = avio_rb16(pb);
605  iff->bitmap_compression = avio_rb16(pb);
606  st->sample_aspect_ratio.num = avio_r8(pb);
607  st->sample_aspect_ratio.den = avio_r8(pb);
609  break;
610 
611  case ID_DLOC:
612  if (data_size < 4)
613  return AVERROR_INVALIDDATA;
614  st->codecpar->width = avio_rb16(pb);
615  st->codecpar->height = avio_rb16(pb);
616  break;
617 
618  case ID_TVDC:
619  if (data_size < sizeof(iff->tvdc))
620  return AVERROR_INVALIDDATA;
621  res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));
622  if (res < 0)
623  return res;
624  break;
625 
626  case ID_ANNO:
627  case ID_TEXT: metadata_tag = "comment"; break;
628  case ID_AUTH: metadata_tag = "artist"; break;
629  case ID_COPYRIGHT: metadata_tag = "copyright"; break;
630  case ID_NAME: metadata_tag = "title"; break;
631 
632  /* DSD tags */
633 
634  case MKTAG('F','V','E','R'):
635  if (data_size < 4)
636  return AVERROR_INVALIDDATA;
637  version = avio_rb32(pb);
638  av_log(s, AV_LOG_DEBUG, "DSIFF v%d.%d.%d.%d\n",version >> 24, (version >> 16) & 0xFF, (version >> 8) & 0xFF, version & 0xFF);
640  break;
641 
642  case MKTAG('D','I','I','N'):
643  res = parse_dsd_diin(s, st, orig_pos + data_size);
644  if (res < 0)
645  return res;
646  break;
647 
648  case MKTAG('P','R','O','P'):
649  if (data_size < 4)
650  return AVERROR_INVALIDDATA;
651  if (avio_rl32(pb) != MKTAG('S','N','D',' ')) {
652  avpriv_request_sample(s, "unknown property type");
653  break;
654  }
655  res = parse_dsd_prop(s, st, orig_pos + data_size);
656  if (res < 0)
657  return res;
658  break;
659 
660  case MKTAG('C','O','M','T'):
661  if (data_size < 2)
662  return AVERROR_INVALIDDATA;
663  nb_comments = avio_rb16(pb);
664  for (i = 0; i < nb_comments; i++) {
665  int year, mon, day, hour, min, type, ref;
666  char tmp[24];
667  const char *tag;
668  int metadata_size;
669 
670  year = avio_rb16(pb);
671  mon = avio_r8(pb);
672  day = avio_r8(pb);
673  hour = avio_r8(pb);
674  min = avio_r8(pb);
675  snprintf(tmp, sizeof(tmp), "%04d-%02d-%02d %02d:%02d", year, mon, day, hour, min);
676  av_dict_set(&st->metadata, "comment_time", tmp, 0);
677 
678  type = avio_rb16(pb);
679  ref = avio_rb16(pb);
680  switch (type) {
681  case 1:
682  if (!i)
683  tag = "channel_comment";
684  else {
685  snprintf(tmp, sizeof(tmp), "channel%d_comment", ref);
686  tag = tmp;
687  }
688  break;
689  case 2:
690  tag = ref < FF_ARRAY_ELEMS(dsd_source_comment) ? dsd_source_comment[ref] : "source_comment";
691  break;
692  case 3:
693  tag = ref < FF_ARRAY_ELEMS(dsd_history_comment) ? dsd_history_comment[ref] : "file_history";
694  break;
695  default:
696  tag = "comment";
697  }
698 
699  metadata_size = avio_rb32(pb);
700  if ((res = get_metadata(s, tag, metadata_size)) < 0) {
701  av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", tag);
702  return res;
703  }
704 
705  if (metadata_size & 1)
706  avio_skip(pb, 1);
707  }
708  break;
709  }
710 
711  if (metadata_tag) {
712  if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
713  av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
714  return res;
715  }
716  }
717  avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
718  }
719 
720  if (st->codecpar->codec_tag == ID_ANIM)
721  avio_seek(pb, 12, SEEK_SET);
722  else
723  avio_seek(pb, iff->body_pos, SEEK_SET);
724 
725  switch(st->codecpar->codec_type) {
726  case AVMEDIA_TYPE_AUDIO:
727  avpriv_set_pts_info(st, 32, 1, st->codecpar->sample_rate);
728 
729  if (st->codecpar->codec_tag == ID_16SV)
731  else if (st->codecpar->codec_tag == ID_MAUD) {
732  if (iff->maud_bits == 8 && !iff->maud_compression) {
734  } else if (iff->maud_bits == 16 && !iff->maud_compression) {
736  } else if (iff->maud_bits == 8 && iff->maud_compression == 2) {
738  } else if (iff->maud_bits == 8 && iff->maud_compression == 3) {
740  } else {
741  avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);
742  return AVERROR_PATCHWELCOME;
743  }
744  } else if (st->codecpar->codec_tag != ID_DSD &&
745  st->codecpar->codec_tag != ID_DST) {
746  switch (iff->svx8_compression) {
747  case COMP_NONE:
749  break;
750  case COMP_FIB:
752  break;
753  case COMP_EXP:
755  break;
756  default:
757  av_log(s, AV_LOG_ERROR,
758  "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
759  return -1;
760  }
761  }
762 
766  if (st->codecpar->codec_tag == ID_DSD && st->codecpar->block_align <= 0)
767  return AVERROR_INVALIDDATA;
768  break;
769 
770  case AVMEDIA_TYPE_VIDEO:
771  iff->bpp = st->codecpar->bits_per_coded_sample;
772  if (st->codecpar->codec_tag == ID_ANIM)
773  avpriv_set_pts_info(st, 32, 1, 60);
774  if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
775  iff->ham = iff->bpp > 6 ? 6 : 4;
777  }
778  iff->flags = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
779  iff->masking = masking;
780  iff->transparency = transparency;
781 
782  if (!st->codecpar->extradata) {
784  if (ret < 0)
785  return ret;
786  }
788  buf = st->codecpar->extradata;
789  bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
790  bytestream_put_byte(&buf, iff->bitmap_compression);
791  bytestream_put_byte(&buf, iff->bpp);
792  bytestream_put_byte(&buf, iff->ham);
793  bytestream_put_byte(&buf, iff->flags);
794  bytestream_put_be16(&buf, iff->transparency);
795  bytestream_put_byte(&buf, iff->masking);
796  bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));
798  break;
799  default:
800  return -1;
801  }
802 
803  return 0;
804 }
805 
806 static unsigned get_anim_duration(uint8_t *buf, int size)
807 {
808  GetByteContext gb;
809 
810  bytestream2_init(&gb, buf, size);
811  bytestream2_skip(&gb, 4);
812  while (bytestream2_get_bytes_left(&gb) > 8) {
813  unsigned chunk = bytestream2_get_le32(&gb);
814  unsigned size = bytestream2_get_be32(&gb);
815 
816  if (chunk == ID_ANHD) {
817  if (size < 40)
818  break;
819  bytestream2_skip(&gb, 14);
820  return bytestream2_get_be32(&gb);
821  } else {
822  bytestream2_skip(&gb, size + size & 1);
823  }
824  }
825  return 10;
826 }
827 
829  AVPacket *pkt)
830 {
831  IffDemuxContext *iff = s->priv_data;
832  AVIOContext *pb = s->pb;
833  AVStream *st = s->streams[0];
834  int ret;
835  int64_t pos = avio_tell(pb);
836 
837  if (avio_feof(pb))
838  return AVERROR_EOF;
839  if (st->codecpar->codec_tag != ID_ANIM && pos >= iff->body_end)
840  return AVERROR_EOF;
841 
842  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
843  if (st->codecpar->codec_tag == ID_DSD || st->codecpar->codec_tag == ID_MAUD) {
844  ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * st->codecpar->block_align));
845  } else if (st->codecpar->codec_tag == ID_DST) {
846  return read_dst_frame(s, pkt);
847  } else {
848  if (iff->body_size > INT_MAX || !iff->body_size)
849  return AVERROR_INVALIDDATA;
850  ret = av_get_packet(pb, pkt, iff->body_size);
851  }
852  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
853  st->codecpar->codec_tag == ID_ANIM) {
854  uint64_t data_size, orig_pos;
855  uint32_t chunk_id, chunk_id2;
856 
857  while (!avio_feof(pb)) {
858  if (avio_feof(pb))
859  return AVERROR_EOF;
860 
861  orig_pos = avio_tell(pb);
862  chunk_id = avio_rl32(pb);
863  data_size = avio_rb32(pb);
864  chunk_id2 = avio_rl32(pb);
865 
866  if (chunk_id == ID_FORM &&
867  chunk_id2 == ID_ILBM) {
868  avio_skip(pb, -4);
869  break;
870  } else if (chunk_id == ID_FORM &&
871  chunk_id2 == ID_ANIM) {
872  continue;
873  } else {
874  avio_skip(pb, data_size);
875  }
876  }
877  ret = av_get_packet(pb, pkt, data_size);
878  pkt->pos = orig_pos;
879  pkt->duration = get_anim_duration(pkt->data, pkt->size);
880  if (pos == 12)
881  pkt->flags |= AV_PKT_FLAG_KEY;
882  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
883  st->codecpar->codec_tag != ID_ANIM) {
884  if (iff->body_size > INT_MAX || !iff->body_size)
885  return AVERROR_INVALIDDATA;
886  ret = av_get_packet(pb, pkt, iff->body_size);
887  pkt->pos = pos;
888  if (pos == iff->body_pos)
889  pkt->flags |= AV_PKT_FLAG_KEY;
890  } else {
891  av_assert0(0);
892  }
893 
894  if (ret < 0)
895  return ret;
896  pkt->stream_index = 0;
897  return ret;
898 }
899 
901  .name = "iff",
902  .long_name = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),
903  .priv_data_size = sizeof(IffDemuxContext),
908 };
static const uint8_t deep_abgr[]
Definition: iff.c:415
#define DSD_SRGT
Definition: iff.c:173
#define NULL
Definition: coverity.c:32
#define DSD_SLFT
Definition: iff.c:172
unsigned transparency
transparency color index in palette
Definition: iff.c:120
#define ID_CAMG
Definition: iff.c:55
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define ID_ANHD
Definition: iff.c:67
static const uint32_t dsd_5point0[]
Definition: iff.c:182
version
Definition: libkvazaar.c:320
unsigned ham
0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
Definition: iff.c:118
#define ID_RGB8
Definition: iff.c:59
#define ID_ACBM
Definition: iff.c:57
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3099
#define ID_PBM
Definition: iff.c:51
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:383
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4893
static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)
Definition: iff.c:249
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:942
int num
Numerator.
Definition: rational.h:59
int size
Definition: packet.h:364
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
unsigned maud_compression
Definition: iff.c:115
int64_t body_end
Definition: iff.c:111
static const uint32_t dsd_5point1[]
Definition: iff.c:183
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
GLint GLenum type
Definition: opengl_enc.c:104
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:341
static AVPacket pkt
#define ID_8SVX
Definition: iff.c:42
#define AV_CH_LAYOUT_STEREO
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:770
svx8_compression_type svx8_compression
Definition: iff.c:113
#define AV_CH_LAYOUT_5POINT0
#define IFF_EXTRA_VIDEO_SIZE
This number of bytes if added at the beginning of each AVPacket which contain additional information ...
Definition: iff.c:100
#define ID_16SV
Definition: iff.c:43
static const DSDLayoutDesc dsd_channel_layout[]
Definition: iff.c:190
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
Format I/O context.
Definition: avformat.h:1239
#define ID_MHDR
Definition: iff.c:45
uint8_t tvdc[32]
TVDC lookup table.
Definition: iff.c:122
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
Public dictionary API.
#define ID_ANNO
Definition: iff.c:73
#define ID_FRTE
Definition: iff.c:65
uint8_t
#define av_malloc(s)
int width
Video only.
Definition: codec_par.h:126
#define ID_MAUD
Definition: iff.c:44
#define DSD_LS
Definition: iff.c:177
#define ID_NAME
Definition: iff.c:79
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:785
uint32_t body_size
Definition: iff.c:112
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:381
static int parse_dsd_diin(AVFormatContext *s, AVStream *st, uint64_t eof)
Definition: iff.c:216
#define ID_DSD
Definition: iff.c:61
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4477
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1307
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
#define ID_DBOD
Definition: iff.c:83
Definition: iff.c:104
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta *extra_meta)
Create chapters for all CHAP tags found in the ID3v2 header.
Definition: id3v2.c:1173
uint8_t * data
Definition: packet.h:363
uint64_t layout
Definition: iff.c:186
uint32_t tag
Definition: movenc.c:1597
#define AVERROR_EOF
End of file.
Definition: error.h:55
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:307
ptrdiff_t size
Definition: opengl_enc.c:100
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:906
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
#define ID_DPAN
Definition: iff.c:69
#define ID_CHAN
Definition: iff.c:50
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:637
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:401
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
#define AV_CH_LAYOUT_5POINT1
#define ID_ANIM
Definition: iff.c:66
static int iff_read_header(AVFormatContext *s)
Definition: iff.c:417
#define ID_TEXT
Definition: iff.c:80
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1595
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1479
#define ID_DST
Definition: iff.c:62
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:754
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:115
static const char * dsd_history_comment[]
Definition: iff.c:208
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:95
unsigned int pos
Definition: spdifenc.c:410
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define ID_FRM8
Definition: iff.c:72
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
Definition: id3v2.c:1117
simple assert() macros that are a bit more flexible than ISO C assert().
#define ID_FORM
Definition: iff.c:71
#define ID_ILBM
Definition: iff.c:52
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:92
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:369
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:628
#define DSD_C
Definition: iff.c:176
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
unsigned flags
1 for EHB, 0 is no extra half darkening
Definition: iff.c:119
int block_align
Audio only.
Definition: codec_par.h:177
#define ID_VHDR
Definition: iff.c:47
#define ID_TVDC
Definition: iff.c:86
audio channel layout utility functions
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:3282
Definition: iff.c:105
#define ID_ABIT
Definition: iff.c:81
#define ID_BODY
Definition: iff.c:82
#define FFMIN(a, b)
Definition: common.h:96
AVInputFormat ff_iff_demuxer
Definition: iff.c:900
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
#define ID_AUTH
Definition: iff.c:74
#define DSD_MLFT
Definition: iff.c:174
static const uint32_t dsd_stereo[]
Definition: iff.c:181
#define s(width, name)
Definition: cbs_vp9.c:257
AVDictionary * metadata
Definition: avformat.h:944
int64_t pts
Definition: iff.c:123
#define FF_ARRAY_ELEMS(a)
static int iff_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: iff.c:828
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
if(ret)
Stream structure.
Definition: avformat.h:880
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
svx8_compression_type
Definition: iff.c:102
unsigned bpp
bits per plane to decode (differs from bits_per_coded_sample if HAM)
Definition: iff.c:117
AVIOContext * pb
I/O context.
Definition: avformat.h:1281
static const uint64_t dsd_loudspeaker_config[]
Definition: iff.c:196
#define ID_RGBN
Definition: iff.c:60
int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta *extra_meta)
Create a stream for each APIC (attached picture) extracted from the ID3v2 header. ...
Definition: id3v2.c:1133
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
#define ID_MDAT
Definition: iff.c:46
#define ID_DEEP
Definition: iff.c:58
static const AVCodecTag dsd_codec_tags[]
Definition: iff.c:165
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
unsigned maud_bits
Definition: iff.c:114
#define snprintf
Definition: snprintf.h:34
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
#define ID_DGBL
Definition: iff.c:54
static int iff_probe(const AVProbeData *p)
Definition: iff.c:145
#define ID_DLOC
Definition: iff.c:85
const uint32_t * dsd_layout
Definition: iff.c:187
static const uint8_t deep_rgba[]
Definition: iff.c:412
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:929
int sample_rate
Audio only.
Definition: codec_par.h:170
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
Main libavformat public API header.
unsigned bitmap_compression
delta compression method used
Definition: iff.c:116
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:107
int is_64bit
chunk size is 64-bit
Definition: iff.c:109
static const uint8_t deep_bgra[]
Definition: iff.c:413
#define ID_CMAP
Definition: iff.c:56
#define DSD_LFE
Definition: iff.c:179
void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta, unsigned int max_search_size)
Read an ID3v2 tag, including supported extra metadata.
Definition: id3v2.c:1111
int den
Denominator.
Definition: rational.h:60
static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
Definition: bytestream.h:372
Definition: iff.c:103
static const uint8_t deep_rgb24[]
Definition: iff.c:411
#define av_free(p)
#define AVFMT_NO_BYTE_SEEK
Format does not allow seeking by bytes.
Definition: avformat.h:470
static const char * dsd_source_comment[]
Definition: iff.c:202
void * priv_data
Format private data.
Definition: avformat.h:1267
int64_t body_pos
Definition: iff.c:110
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
int channels
Audio only.
Definition: codec_par.h:166
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:652
#define ID_DPEL
Definition: iff.c:84
static int get_metadata(AVFormatContext *s, const char *const tag, const unsigned data_size)
Definition: iff.c:127
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1045
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:368
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
#define DSD_MRGT
Definition: iff.c:175
#define DSD_RS
Definition: iff.c:178
static const uint8_t deep_argb[]
Definition: iff.c:414
int stream_index
Definition: packet.h:365
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
#define ID_COPYRIGHT
Definition: iff.c:76
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:405
#define ID_BMHD
Definition: iff.c:53
float min
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:91
This structure stores compressed data.
Definition: packet.h:340
#define ID_DSTF
Definition: iff.c:64
int i
Definition: input.c:407
static int read_dst_frame(AVFormatContext *s, AVPacket *pkt)
Definition: iff.c:354
unsigned masking
masking method used
Definition: iff.c:121
static unsigned get_anim_duration(uint8_t *buf, int size)
Definition: iff.c:806
static uint8_t tmp[11]
Definition: aes_ctr.c:27