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cafdec.c
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1 /*
2  * Core Audio Format demuxer
3  * Copyright (c) 2007 Justin Ruggles
4  * Copyright (c) 2009 Peter Ross
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  * Core Audio Format demuxer
26  */
27 
28 #include <inttypes.h>
29 
30 #include "avformat.h"
31 #include "internal.h"
32 #include "isom.h"
33 #include "mov_chan.h"
34 #include "libavutil/intreadwrite.h"
35 #include "libavutil/intfloat.h"
36 #include "libavutil/dict.h"
37 #include "caf.h"
38 
39 typedef struct CafContext {
40  int bytes_per_packet; ///< bytes in a packet, or 0 if variable
41  int frames_per_packet; ///< frames in a packet, or 0 if variable
42  int64_t num_bytes; ///< total number of bytes in stream
43 
44  int64_t packet_cnt; ///< packet counter
45  int64_t frame_cnt; ///< frame counter
46 
47  int64_t data_start; ///< data start position, in bytes
48  int64_t data_size; ///< raw data size, in bytes
49 } CafContext;
50 
51 static int probe(AVProbeData *p)
52 {
53  if (AV_RB32(p->buf) == MKBETAG('c','a','f','f') && AV_RB16(&p->buf[4]) == 1)
54  return AVPROBE_SCORE_MAX;
55  return 0;
56 }
57 
58 /** Read audio description chunk */
60 {
61  AVIOContext *pb = s->pb;
62  CafContext *caf = s->priv_data;
63  AVStream *st;
64  int flags;
65 
66  /* new audio stream */
67  st = avformat_new_stream(s, NULL);
68  if (!st)
69  return AVERROR(ENOMEM);
70 
71  /* parse format description */
74  st->codecpar->codec_tag = avio_rl32(pb);
75  flags = avio_rb32(pb);
76  caf->bytes_per_packet = avio_rb32(pb);
78  caf->frames_per_packet = avio_rb32(pb);
79  st->codecpar->channels = avio_rb32(pb);
81 
82  /* calculate bit rate for constant size packets */
83  if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
84  st->codecpar->bit_rate = (uint64_t)st->codecpar->sample_rate * (uint64_t)caf->bytes_per_packet * 8
85  / (uint64_t)caf->frames_per_packet;
86  } else {
87  st->codecpar->bit_rate = 0;
88  }
89 
90  /* determine codec */
91  if (st->codecpar->codec_tag == MKTAG('l','p','c','m'))
93  else
95  return 0;
96 }
97 
98 /** Read magic cookie chunk */
99 static int read_kuki_chunk(AVFormatContext *s, int64_t size)
100 {
101  AVIOContext *pb = s->pb;
102  AVStream *st = s->streams[0];
103 
105  return -1;
106 
107  if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
108  /* The magic cookie format for AAC is an mp4 esds atom.
109  The lavc AAC decoder requires the data from the codec specific
110  description as extradata input. */
111  int strt, skip;
112 
113  strt = avio_tell(pb);
114  ff_mov_read_esds(s, pb);
115  skip = size - (avio_tell(pb) - strt);
116  if (skip < 0 || !st->codecpar->extradata ||
118  av_log(s, AV_LOG_ERROR, "invalid AAC magic cookie\n");
119  return AVERROR_INVALIDDATA;
120  }
121  avio_skip(pb, skip);
122  } else if (st->codecpar->codec_id == AV_CODEC_ID_ALAC) {
123 #define ALAC_PREAMBLE 12
124 #define ALAC_HEADER 36
125 #define ALAC_NEW_KUKI 24
126  uint8_t preamble[12];
127  if (size < ALAC_NEW_KUKI) {
128  av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
129  avio_skip(pb, size);
130  return AVERROR_INVALIDDATA;
131  }
132  if (avio_read(pb, preamble, ALAC_PREAMBLE) != ALAC_PREAMBLE) {
133  av_log(s, AV_LOG_ERROR, "failed to read preamble\n");
134  return AVERROR_INVALIDDATA;
135  }
136 
137  av_freep(&st->codecpar->extradata);
139  return AVERROR(ENOMEM);
140 
141  /* For the old style cookie, we skip 12 bytes, then read 36 bytes.
142  * The new style cookie only contains the last 24 bytes of what was
143  * 36 bytes in the old style cookie, so we fabricate the first 12 bytes
144  * in that case to maintain compatibility. */
145  if (!memcmp(&preamble[4], "frmaalac", 8)) {
146  if (size < ALAC_PREAMBLE + ALAC_HEADER) {
147  av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
148  av_freep(&st->codecpar->extradata);
149  return AVERROR_INVALIDDATA;
150  }
151  if (avio_read(pb, st->codecpar->extradata, ALAC_HEADER) != ALAC_HEADER) {
152  av_log(s, AV_LOG_ERROR, "failed to read kuki header\n");
153  av_freep(&st->codecpar->extradata);
154  return AVERROR_INVALIDDATA;
155  }
156  avio_skip(pb, size - ALAC_PREAMBLE - ALAC_HEADER);
157  } else {
158  AV_WB32(st->codecpar->extradata, 36);
159  memcpy(&st->codecpar->extradata[4], "alac", 4);
160  AV_WB32(&st->codecpar->extradata[8], 0);
161  memcpy(&st->codecpar->extradata[12], preamble, 12);
162  if (avio_read(pb, &st->codecpar->extradata[24], ALAC_NEW_KUKI - 12) != ALAC_NEW_KUKI - 12) {
163  av_log(s, AV_LOG_ERROR, "failed to read new kuki header\n");
164  av_freep(&st->codecpar->extradata);
165  return AVERROR_INVALIDDATA;
166  }
167  avio_skip(pb, size - ALAC_NEW_KUKI);
168  }
169  } else {
170  av_freep(&st->codecpar->extradata);
171  if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
172  return AVERROR(ENOMEM);
173  }
174 
175  return 0;
176 }
177 
178 /** Read packet table chunk */
179 static int read_pakt_chunk(AVFormatContext *s, int64_t size)
180 {
181  AVIOContext *pb = s->pb;
182  AVStream *st = s->streams[0];
183  CafContext *caf = s->priv_data;
184  int64_t pos = 0, ccount, num_packets;
185  int i;
186 
187  ccount = avio_tell(pb);
188 
189  num_packets = avio_rb64(pb);
190  if (num_packets < 0 || INT32_MAX / sizeof(AVIndexEntry) < num_packets)
191  return AVERROR_INVALIDDATA;
192 
193  st->nb_frames = avio_rb64(pb); /* valid frames */
194  st->nb_frames += avio_rb32(pb); /* priming frames */
195  st->nb_frames += avio_rb32(pb); /* remainder frames */
196 
197  st->duration = 0;
198  for (i = 0; i < num_packets; i++) {
199  av_add_index_entry(s->streams[0], pos, st->duration, 0, 0, AVINDEX_KEYFRAME);
202  }
203 
204  if (avio_tell(pb) - ccount > size) {
205  av_log(s, AV_LOG_ERROR, "error reading packet table\n");
206  return AVERROR_INVALIDDATA;
207  }
208  avio_skip(pb, ccount + size - avio_tell(pb));
209 
210  caf->num_bytes = pos;
211  return 0;
212 }
213 
214 /** Read information chunk */
215 static void read_info_chunk(AVFormatContext *s, int64_t size)
216 {
217  AVIOContext *pb = s->pb;
218  unsigned int i;
219  unsigned int nb_entries = avio_rb32(pb);
220  for (i = 0; i < nb_entries && !avio_feof(pb); i++) {
221  char key[32];
222  char value[1024];
223  avio_get_str(pb, INT_MAX, key, sizeof(key));
224  avio_get_str(pb, INT_MAX, value, sizeof(value));
225  av_dict_set(&s->metadata, key, value, 0);
226  }
227 }
228 
230 {
231  AVIOContext *pb = s->pb;
232  CafContext *caf = s->priv_data;
233  AVStream *st;
234  uint32_t tag = 0;
235  int found_data, ret;
236  int64_t size, pos;
237 
238  avio_skip(pb, 8); /* magic, version, file flags */
239 
240  /* audio description chunk */
241  if (avio_rb32(pb) != MKBETAG('d','e','s','c')) {
242  av_log(s, AV_LOG_ERROR, "desc chunk not present\n");
243  return AVERROR_INVALIDDATA;
244  }
245  size = avio_rb64(pb);
246  if (size != 32)
247  return AVERROR_INVALIDDATA;
248 
249  ret = read_desc_chunk(s);
250  if (ret)
251  return ret;
252  st = s->streams[0];
253 
254  /* parse each chunk */
255  found_data = 0;
256  while (!avio_feof(pb)) {
257 
258  /* stop at data chunk if seeking is not supported or
259  data chunk size is unknown */
260  if (found_data && (caf->data_size < 0 || !pb->seekable))
261  break;
262 
263  tag = avio_rb32(pb);
264  size = avio_rb64(pb);
265  pos = avio_tell(pb);
266  if (avio_feof(pb))
267  break;
268 
269  switch (tag) {
270  case MKBETAG('d','a','t','a'):
271  avio_skip(pb, 4); /* edit count */
272  caf->data_start = avio_tell(pb);
273  caf->data_size = size < 0 ? -1 : size - 4;
274  if (caf->data_size > 0 && pb->seekable)
275  avio_skip(pb, caf->data_size);
276  found_data = 1;
277  break;
278 
279  case MKBETAG('c','h','a','n'):
280  if ((ret = ff_mov_read_chan(s, s->pb, st, size)) < 0)
281  return ret;
282  break;
283 
284  /* magic cookie chunk */
285  case MKBETAG('k','u','k','i'):
286  if (read_kuki_chunk(s, size))
287  return AVERROR_INVALIDDATA;
288  break;
289 
290  /* packet table chunk */
291  case MKBETAG('p','a','k','t'):
292  if (read_pakt_chunk(s, size))
293  return AVERROR_INVALIDDATA;
294  break;
295 
296  case MKBETAG('i','n','f','o'):
297  read_info_chunk(s, size);
298  break;
299 
300  default:
301 #define _(x) ((x) >= ' ' ? (x) : ' ')
303  "skipping CAF chunk: %08"PRIX32" (%c%c%c%c), size %"PRId64"\n",
304  tag, _(tag>>24), _((tag>>16)&0xFF), _((tag>>8)&0xFF), _(tag&0xFF), size);
305 #undef _
306  case MKBETAG('f','r','e','e'):
307  if (size < 0)
308  return AVERROR_INVALIDDATA;
309  break;
310  }
311 
312  if (size > 0) {
313  if (pos > INT64_MAX - size)
314  return AVERROR_INVALIDDATA;
315  avio_skip(pb, FFMAX(0, pos + size - avio_tell(pb)));
316  }
317  }
318 
319  if (!found_data)
320  return AVERROR_INVALIDDATA;
321 
322  if (caf->bytes_per_packet > 0 && caf->frames_per_packet > 0) {
323  if (caf->data_size > 0)
324  st->nb_frames = (caf->data_size / caf->bytes_per_packet) * caf->frames_per_packet;
325  } else if (st->nb_index_entries && st->duration > 0) {
326  st->codecpar->bit_rate = st->codecpar->sample_rate * caf->data_size * 8 /
327  st->duration;
328  } else {
329  av_log(s, AV_LOG_ERROR, "Missing packet table. It is required when "
330  "block size or frame size are variable.\n");
331  return AVERROR_INVALIDDATA;
332  }
333 
334  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
335  st->start_time = 0;
336 
337  /* position the stream at the start of data */
338  if (caf->data_size >= 0)
339  avio_seek(pb, caf->data_start, SEEK_SET);
340 
341  return 0;
342 }
343 
344 #define CAF_MAX_PKT_SIZE 4096
345 
347 {
348  AVIOContext *pb = s->pb;
349  AVStream *st = s->streams[0];
350  CafContext *caf = s->priv_data;
351  int res, pkt_size = 0, pkt_frames = 0;
352  int64_t left = CAF_MAX_PKT_SIZE;
353 
354  if (avio_feof(pb))
355  return AVERROR_EOF;
356 
357  /* don't read past end of data chunk */
358  if (caf->data_size > 0) {
359  left = (caf->data_start + caf->data_size) - avio_tell(pb);
360  if (!left)
361  return AVERROR_EOF;
362  if (left < 0)
363  return AVERROR(EIO);
364  }
365 
366  pkt_frames = caf->frames_per_packet;
367  pkt_size = caf->bytes_per_packet;
368 
369  if (pkt_size > 0 && pkt_frames == 1) {
370  pkt_size = (CAF_MAX_PKT_SIZE / pkt_size) * pkt_size;
371  pkt_size = FFMIN(pkt_size, left);
372  pkt_frames = pkt_size / caf->bytes_per_packet;
373  } else if (st->nb_index_entries) {
374  if (caf->packet_cnt < st->nb_index_entries - 1) {
375  pkt_size = st->index_entries[caf->packet_cnt + 1].pos - st->index_entries[caf->packet_cnt].pos;
376  pkt_frames = st->index_entries[caf->packet_cnt + 1].timestamp - st->index_entries[caf->packet_cnt].timestamp;
377  } else if (caf->packet_cnt == st->nb_index_entries - 1) {
378  pkt_size = caf->num_bytes - st->index_entries[caf->packet_cnt].pos;
379  pkt_frames = st->duration - st->index_entries[caf->packet_cnt].timestamp;
380  } else {
381  return AVERROR(EIO);
382  }
383  }
384 
385  if (pkt_size == 0 || pkt_frames == 0 || pkt_size > left)
386  return AVERROR(EIO);
387 
388  res = av_get_packet(pb, pkt, pkt_size);
389  if (res < 0)
390  return res;
391 
392  pkt->size = res;
393  pkt->stream_index = 0;
394  pkt->dts = pkt->pts = caf->frame_cnt;
395 
396  caf->packet_cnt++;
397  caf->frame_cnt += pkt_frames;
398 
399  return 0;
400 }
401 
402 static int read_seek(AVFormatContext *s, int stream_index,
403  int64_t timestamp, int flags)
404 {
405  AVStream *st = s->streams[0];
406  CafContext *caf = s->priv_data;
407  int64_t pos, packet_cnt, frame_cnt;
408 
409  timestamp = FFMAX(timestamp, 0);
410 
411  if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
412  /* calculate new byte position based on target frame position */
413  pos = caf->bytes_per_packet * (timestamp / caf->frames_per_packet);
414  if (caf->data_size > 0)
415  pos = FFMIN(pos, caf->data_size);
416  packet_cnt = pos / caf->bytes_per_packet;
417  frame_cnt = caf->frames_per_packet * packet_cnt;
418  } else if (st->nb_index_entries) {
419  packet_cnt = av_index_search_timestamp(st, timestamp, flags);
420  frame_cnt = st->index_entries[packet_cnt].timestamp;
421  pos = st->index_entries[packet_cnt].pos;
422  } else {
423  return -1;
424  }
425 
426  if (avio_seek(s->pb, pos + caf->data_start, SEEK_SET) < 0)
427  return -1;
428 
429  caf->packet_cnt = packet_cnt;
430  caf->frame_cnt = frame_cnt;
431 
432  return 0;
433 }
434 
436  .name = "caf",
437  .long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
438  .priv_data_size = sizeof(CafContext),
439  .read_probe = probe,
442  .read_seek = read_seek,
443  .codec_tag = (const AVCodecTag* const []){ ff_codec_caf_tags, 0 },
444 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: cafdec.c:346
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:1900
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2944
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int bytes_per_packet
bytes in a packet, or 0 if variable
Definition: cafdec.c:40
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:4404
int64_t pos
Definition: avformat.h:816
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3915
int size
Definition: avcodec.h:1578
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:213
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1085
CAF common code.
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:287
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
#define CAF_MAX_PKT_SIZE
Definition: cafdec.c:344
static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: cafdec.c:402
static int read_header(AVFormatContext *s)
Definition: cafdec.c:229
#define _(x)
Format I/O context.
Definition: avformat.h:1319
#define ALAC_PREAMBLE
Public dictionary API.
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
uint8_t
static int read_kuki_chunk(AVFormatContext *s, int64_t size)
Read magic cookie chunk.
Definition: cafdec.c:99
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:703
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4042
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1387
uint32_t tag
Definition: movenc.c:1353
#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:260
ptrdiff_t size
Definition: opengl_enc.c:101
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:770
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:447
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:550
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3944
#define AVINDEX_KEYFRAME
Definition: avformat.h:823
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1533
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1999
int ff_mp4_read_descr_len(AVIOContext *pb)
Definition: isom.c:412
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:672
#define AVERROR(e)
Definition: error.h:43
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:817
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3911
int64_t num_bytes
total number of bytes in stream
Definition: cafdec.c:42
#define FFMAX(a, b)
Definition: common.h:94
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:461
int block_align
Audio only.
Definition: avcodec.h:4032
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:207
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:3105
#define FFMIN(a, b)
Definition: common.h:96
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
int64_t data_start
data start position, in bytes
Definition: cafdec.c:47
int64_t data_size
raw data size, in bytes
Definition: cafdec.c:48
AVInputFormat ff_caf_demuxer
Definition: cafdec.c:435
#define ALAC_NEW_KUKI
int ff_mov_read_chan(AVFormatContext *s, AVIOContext *pb, AVStream *st, int64_t size)
Read 'chan' tag from the input stream.
Definition: mov_chan.c:547
int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb)
Definition: mov.c:706
Stream structure.
Definition: avformat.h:876
AVIOContext * pb
I/O context.
Definition: avformat.h:1361
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:69
int nb_index_entries
Definition: avformat.h:1087
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
int frames_per_packet
frames in a packet, or 0 if variable
Definition: cafdec.c:41
static void read_info_chunk(AVFormatContext *s, int64_t size)
Read information chunk.
Definition: cafdec.c:215
This structure contains the data a format has to probe a file.
Definition: avformat.h:459
static int read_pakt_chunk(AVFormatContext *s, int64_t size)
Read packet table chunk.
Definition: cafdec.c:179
static int flags
Definition: cpu.c:47
static int probe(AVProbeData *p)
Definition: cafdec.c:51
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
int sample_rate
Audio only.
Definition: avcodec.h:4025
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:471
Main libavformat public API header.
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:923
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:3126
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:932
#define ALAC_HEADER
#define MKBETAG(a, b, c, d)
Definition: common.h:343
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:728
void * priv_data
Format private data.
Definition: avformat.h:1347
enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
Compute codec id for 'lpcm' tag.
Definition: mov.c:1748
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3957
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3929
int channels
Audio only.
Definition: avcodec.h:4021
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1576
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1006
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:728
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:311
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3919
static int read_desc_chunk(AVFormatContext *s)
Read audio description chunk.
Definition: cafdec.c:59
int stream_index
Definition: avcodec.h:1579
const AVCodecTag ff_codec_caf_tags[]
Known codec tags for CAF.
Definition: caf.c:34
#define MKTAG(a, b, c, d)
Definition: common.h:342
This structure stores compressed data.
Definition: avcodec.h:1554
int64_t packet_cnt
packet counter
Definition: cafdec.c:44
int64_t frame_cnt
frame counter
Definition: cafdec.c:45
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1570