FFmpeg  4.3.9
aiffdec.c
Go to the documentation of this file.
1 /*
2  * AIFF/AIFF-C demuxer
3  * Copyright (c) 2006 Patrick Guimond
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/mathematics.h"
24 #include "libavutil/dict.h"
25 #include "avformat.h"
26 #include "internal.h"
27 #include "pcm.h"
28 #include "aiff.h"
29 #include "isom.h"
30 #include "id3v2.h"
31 #include "mov_chan.h"
32 #include "replaygain.h"
33 
34 #define AIFF 0
35 #define AIFF_C_VERSION1 0xA2805140
36 
37 typedef struct AIFFInputContext {
41 
43 {
44  if (bps <= 8)
45  return AV_CODEC_ID_PCM_S8;
46  if (bps <= 16)
47  return AV_CODEC_ID_PCM_S16BE;
48  if (bps <= 24)
49  return AV_CODEC_ID_PCM_S24BE;
50  if (bps <= 32)
51  return AV_CODEC_ID_PCM_S32BE;
52 
53  /* bigger than 32 isn't allowed */
54  return AV_CODEC_ID_NONE;
55 }
56 
57 /* returns the size of the found tag */
58 static int64_t get_tag(AVIOContext *pb, uint32_t * tag)
59 {
60  int64_t size;
61 
62  if (avio_feof(pb))
63  return AVERROR(EIO);
64 
65  *tag = avio_rl32(pb);
66  size = avio_rb32(pb);
67 
68  return size;
69 }
70 
71 /* Metadata string read */
72 static void get_meta(AVFormatContext *s, const char *key, int64_t size)
73 {
74  uint8_t *str = NULL;
75 
76  if (size < SIZE_MAX)
77  str = av_malloc(size+1);
78 
79  if (str) {
80  int res = avio_read(s->pb, str, size);
81  if (res < 0){
82  av_free(str);
83  return;
84  }
85  size -= res;
86  str[res] = 0;
88  }
89 
90  avio_skip(s->pb, size);
91 }
92 
93 /* Returns the number of sound data frames or negative on error */
95  unsigned version)
96 {
97  AVIOContext *pb = s->pb;
98  AVCodecParameters *par = s->streams[0]->codecpar;
99  AIFFInputContext *aiff = s->priv_data;
100  int exp;
101  uint64_t val;
102  int sample_rate;
103  unsigned int num_frames;
104 
105  if (size & 1)
106  size++;
108  par->channels = avio_rb16(pb);
109  num_frames = avio_rb32(pb);
110  par->bits_per_coded_sample = avio_rb16(pb);
111 
112  exp = avio_rb16(pb) - 16383 - 63;
113  val = avio_rb64(pb);
114  if (exp <-63 || exp >63) {
115  av_log(s, AV_LOG_ERROR, "exp %d is out of range\n", exp);
116  return AVERROR_INVALIDDATA;
117  }
118  if (exp >= 0)
119  sample_rate = val << exp;
120  else
121  sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
122  if (sample_rate <= 0)
123  return AVERROR_INVALIDDATA;
124 
125  par->sample_rate = sample_rate;
126  if (size < 18)
127  return AVERROR_INVALIDDATA;
128  size -= 18;
129 
130  /* get codec id for AIFF-C */
131  if (size < 4) {
132  version = AIFF;
133  } else if (version == AIFF_C_VERSION1) {
134  par->codec_tag = avio_rl32(pb);
136  if (par->codec_id == AV_CODEC_ID_NONE)
137  avpriv_request_sample(s, "unknown or unsupported codec tag: %s",
138  av_fourcc2str(par->codec_tag));
139  size -= 4;
140  }
141 
142  if (version != AIFF_C_VERSION1 || par->codec_id == AV_CODEC_ID_PCM_S16BE) {
145  aiff->block_duration = 1;
146  } else {
147  switch (par->codec_id) {
153  aiff->block_duration = 1;
154  break;
156  par->block_align = 34 * par->channels;
157  break;
158  case AV_CODEC_ID_MACE3:
159  par->block_align = 2 * par->channels;
160  break;
162  par->bits_per_coded_sample = 5;
165  case AV_CODEC_ID_MACE6:
167  par->block_align = 1 * par->channels;
168  break;
169  case AV_CODEC_ID_GSM:
170  par->block_align = 33;
171  break;
172  default:
173  aiff->block_duration = 1;
174  break;
175  }
176  if (par->block_align > 0)
178  par->block_align);
179  }
180 
181  /* Block align needs to be computed in all cases, as the definition
182  * is specific to applications -> here we use the WAVE format definition */
183  if (!par->block_align)
184  par->block_align = (av_get_bits_per_sample(par->codec_id) * par->channels) >> 3;
185 
186  if (aiff->block_duration) {
187  par->bit_rate = av_rescale(par->sample_rate, par->block_align * 8LL,
188  aiff->block_duration);
189  if (par->bit_rate < 0)
190  par->bit_rate = 0;
191  }
192 
193  /* Chunk is over */
194  if (size)
195  avio_skip(pb, size);
196 
197  return num_frames;
198 }
199 
200 static int aiff_probe(const AVProbeData *p)
201 {
202  /* check file header */
203  if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
204  p->buf[2] == 'R' && p->buf[3] == 'M' &&
205  p->buf[8] == 'A' && p->buf[9] == 'I' &&
206  p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
207  return AVPROBE_SCORE_MAX;
208  else
209  return 0;
210 }
211 
212 /* aiff input */
214 {
215  int ret;
216  int64_t filesize, size;
217  int64_t offset = 0, position;
218  uint32_t tag;
219  unsigned version = AIFF_C_VERSION1;
220  AVIOContext *pb = s->pb;
221  AVStream * st;
222  AIFFInputContext *aiff = s->priv_data;
223  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
224 
225  /* check FORM header */
226  filesize = get_tag(pb, &tag);
227  if (filesize < 4 || tag != MKTAG('F', 'O', 'R', 'M'))
228  return AVERROR_INVALIDDATA;
229 
230  /* AIFF data type */
231  tag = avio_rl32(pb);
232  if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
233  version = AIFF;
234  else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
235  return AVERROR_INVALIDDATA;
236 
237  filesize -= 4;
238 
239  st = avformat_new_stream(s, NULL);
240  if (!st)
241  return AVERROR(ENOMEM);
242 
243  while (filesize > 0) {
244  /* parse different chunks */
245  size = get_tag(pb, &tag);
246 
247  if (size == AVERROR_EOF && offset > 0 && st->codecpar->block_align) {
248  av_log(s, AV_LOG_WARNING, "header parser hit EOF\n");
249  goto got_sound;
250  }
251  if (size < 0)
252  return size;
253 
254  filesize -= size + 8;
255 
256  switch (tag) {
257  case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
258  /* Then for the complete header info */
259  st->nb_frames = get_aiff_header(s, size, version);
260  if (st->nb_frames < 0)
261  return st->nb_frames;
262  if (offset > 0) // COMM is after SSND
263  goto got_sound;
264  break;
265  case MKTAG('I', 'D', '3', ' '):
266  position = avio_tell(pb);
267  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
268  if (id3v2_extra_meta)
269  if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0 ||
270  (ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0) {
271  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
272  return ret;
273  }
274  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
275  if (position + size > avio_tell(pb))
276  avio_skip(pb, position + size - avio_tell(pb));
277  break;
278  case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
279  version = avio_rb32(pb);
280  break;
281  case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
282  get_meta(s, "title" , size);
283  break;
284  case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
285  get_meta(s, "author" , size);
286  break;
287  case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
288  get_meta(s, "copyright", size);
289  break;
290  case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
291  get_meta(s, "comment" , size);
292  break;
293  case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
294  if (size < 8)
295  return AVERROR_INVALIDDATA;
296  aiff->data_end = avio_tell(pb) + size;
297  offset = avio_rb32(pb); /* Offset of sound data */
298  avio_rb32(pb); /* BlockSize... don't care */
299  offset += avio_tell(pb); /* Compute absolute data offset */
300  if (st->codecpar->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) /* Assume COMM already parsed */
301  goto got_sound;
302  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
303  av_log(s, AV_LOG_ERROR, "file is not seekable\n");
304  return -1;
305  }
306  avio_skip(pb, size - 8);
307  break;
308  case MKTAG('w', 'a', 'v', 'e'):
309  if ((uint64_t)size > (1<<30))
310  return -1;
311  if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
312  return ret;
314  && size>=12*4 && !st->codecpar->block_align) {
315  st->codecpar->block_align = AV_RB32(st->codecpar->extradata+11*4);
316  aiff->block_duration = AV_RB32(st->codecpar->extradata+9*4);
317  } else if (st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
318  char rate = 0;
319  if (size >= 25)
320  rate = st->codecpar->extradata[24];
321  switch (rate) {
322  case 'H': // RATE_HALF
323  st->codecpar->block_align = 17;
324  break;
325  case 'F': // RATE_FULL
326  default:
327  st->codecpar->block_align = 35;
328  }
329  aiff->block_duration = 160;
330  st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate * (st->codecpar->block_align << 3) /
331  aiff->block_duration;
332  }
333  break;
334  case MKTAG('C','H','A','N'):
335  if ((ret = ff_mov_read_chan(s, pb, st, size)) < 0)
336  return ret;
337  break;
338  case MKTAG('A','P','C','M'): /* XA ADPCM compressed sound chunk */
340  aiff->data_end = avio_tell(pb) + size;
341  offset = avio_tell(pb) + 8;
342  /* This field is unknown and its data seems to be irrelevant */
343  avio_rb32(pb);
344  st->codecpar->block_align = avio_rb32(pb);
345 
346  goto got_sound;
347  break;
348  case 0:
349  if (offset > 0 && st->codecpar->block_align) // COMM && SSND
350  goto got_sound;
351  default: /* Jump */
352  avio_skip(pb, size);
353  }
354 
355  /* Skip required padding byte for odd-sized chunks. */
356  if (size & 1) {
357  filesize--;
358  avio_skip(pb, 1);
359  }
360  }
361 
362  ret = ff_replaygain_export(st, s->metadata);
363  if (ret < 0)
364  return ret;
365 
366 got_sound:
367  if (!st->codecpar->block_align && st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
368  av_log(s, AV_LOG_WARNING, "qcelp without wave chunk, assuming full rate\n");
369  st->codecpar->block_align = 35;
370  } else if (st->codecpar->block_align <= 0) {
371  av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
372  return -1;
373  }
374  if (aiff->block_duration < 0)
375  return AVERROR_INVALIDDATA;
376 
377  /* Now positioned, get the sound data start and end */
378  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
379  st->start_time = 0;
380  st->duration = st->nb_frames * aiff->block_duration;
381 
382  /* Position the stream at the first block */
383  avio_seek(pb, offset, SEEK_SET);
384 
385  return 0;
386 }
387 
388 #define MAX_SIZE 4096
389 
391  AVPacket *pkt)
392 {
393  AVStream *st = s->streams[0];
394  AIFFInputContext *aiff = s->priv_data;
395  int64_t max_size;
396  int res, size;
397 
398  /* calculate size of remaining data */
399  max_size = aiff->data_end - avio_tell(s->pb);
400  if (max_size <= 0)
401  return AVERROR_EOF;
402 
403  if (!st->codecpar->block_align) {
404  av_log(s, AV_LOG_ERROR, "block_align not set\n");
405  return AVERROR_INVALIDDATA;
406  }
407 
408  /* Now for that packet */
409  switch (st->codecpar->codec_id) {
411  case AV_CODEC_ID_GSM:
412  case AV_CODEC_ID_QDM2:
413  case AV_CODEC_ID_QCELP:
414  size = st->codecpar->block_align;
415  break;
416  default:
418  if (!size)
419  return AVERROR_INVALIDDATA;
420  }
421  size = FFMIN(max_size, size);
422  res = av_get_packet(s->pb, pkt, size);
423  if (res < 0)
424  return res;
425 
426  if (size >= st->codecpar->block_align)
427  pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
428  /* Only one stream in an AIFF file */
429  pkt->stream_index = 0;
430  pkt->duration = (res / st->codecpar->block_align) * (int64_t) aiff->block_duration;
431  return 0;
432 }
433 
435  .name = "aiff",
436  .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
437  .priv_data_size = sizeof(AIFFInputContext),
442  .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
443 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
version
Definition: libkvazaar.c:292
int size
int64_t data_end
Definition: aiffdec.c:38
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3165
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
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:4948
#define MAX_SIZE
Definition: aiffdec.c:388
#define avpriv_request_sample(...)
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
#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:241
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
const char * key
static int aiff_read_header(AVFormatContext *s)
Definition: aiffdec.c:213
static AVPacket pkt
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:763
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
Format I/O context.
Definition: avformat.h:1351
Public dictionary API.
uint8_t
#define av_malloc(s)
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:778
#define AV_RB32
Definition: intreadwrite.h:130
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:373
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4526
static int aiff_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: aiffdec.c:390
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
#define AIFF_C_VERSION1
Definition: aiffdec.c:35
static int64_t get_tag(AVIOContext *pb, uint32_t *tag)
Definition: aiffdec.c:58
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta *extra_meta)
Create chapters for all CHAP tags found in the ID3v2 header.
Definition: id3v2.c:1180
uint32_t tag
Definition: movenc.c:1532
#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
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:899
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
int ff_replaygain_export(AVStream *st, AVDictionary *metadata)
Parse replaygain tags and export them as per-stream side data.
Definition: replaygain.c:91
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:625
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1583
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1591
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:747
#define AVERROR(e)
Definition: error.h:43
static int get_aiff_header(AVFormatContext *s, int64_t size, unsigned version)
Definition: aiffdec.c:94
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
#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:1124
static enum AVCodecID aiff_codec_get_id(int bps)
Definition: aiffdec.c:42
static const uint8_t offset[127][2]
Definition: vf_spp.c:93
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
Definition: utils.c:1818
int8_t exp
Definition: eval.c:72
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:361
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
int block_align
Audio only.
Definition: codec_par.h:177
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
#define FFMIN(a, b)
Definition: common.h:96
#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 s(width, name)
Definition: cbs_vp9.c:257
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:56
static int aiff_probe(const AVProbeData *p)
Definition: aiffdec.c:200
int ff_mov_read_chan(AVFormatContext *s, AVIOContext *pb, AVStream *st, int64_t size)
Read &#39;chan&#39; tag from the input stream.
Definition: mov_chan.c:547
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
Stream structure.
Definition: avformat.h:876
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int block_duration
Definition: aiffdec.c:39
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
sample_rate
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
long long int64_t
Definition: coverity.c:34
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:1140
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
static void get_meta(AVFormatContext *s, const char *key, int64_t size)
Definition: aiffdec.c:72
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
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:925
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.
AVInputFormat ff_aiff_demuxer
Definition: aiffdec.c:434
if(ret< 0)
Definition: vf_mcdeint.c:279
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:915
int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:3346
static const AVCodecTag ff_codec_aiff_tags[]
Definition: aiff.h:33
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:1118
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:927
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: packet.h:389
unsigned bps
Definition: movenc.c:1533
#define AIFF
Definition: aiffdec.c:34
#define av_free(p)
as in Berlin toast format
Definition: codec_id.h:428
void * priv_data
Format private data.
Definition: avformat.h:1379
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
common header for AIFF muxer and demuxer
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:356
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
int stream_index
Definition: packet.h:357
#define MKTAG(a, b, c, d)
Definition: common.h:406
static double val(void *priv, double ch)
Definition: aeval.c:76
This structure stores compressed data.
Definition: packet.h:332