FFmpeg  4.1.11
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 */
73  st->codecpar->sample_rate = av_clipd(av_int2double(avio_rb64(pb)), 0, INT_MAX);
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  if (caf->bytes_per_packet < 0 || caf->frames_per_packet < 0 || st->codecpar->channels < 0)
83  return AVERROR_INVALIDDATA;
84 
85  /* calculate bit rate for constant size packets */
86  if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
87  st->codecpar->bit_rate = (uint64_t)st->codecpar->sample_rate * (uint64_t)caf->bytes_per_packet * 8
88  / (uint64_t)caf->frames_per_packet;
89  } else {
90  st->codecpar->bit_rate = 0;
91  }
92 
93  /* determine codec */
94  if (st->codecpar->codec_tag == MKTAG('l','p','c','m'))
96  else
98  return 0;
99 }
100 
101 /** Read magic cookie chunk */
102 static int read_kuki_chunk(AVFormatContext *s, int64_t size)
103 {
104  AVIOContext *pb = s->pb;
105  AVStream *st = s->streams[0];
106 
107  if (size < 0 || size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
108  return -1;
109 
110  if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
111  /* The magic cookie format for AAC is an mp4 esds atom.
112  The lavc AAC decoder requires the data from the codec specific
113  description as extradata input. */
114  int strt, skip;
115 
116  strt = avio_tell(pb);
117  ff_mov_read_esds(s, pb);
118  skip = size - (avio_tell(pb) - strt);
119  if (skip < 0 || !st->codecpar->extradata ||
121  av_log(s, AV_LOG_ERROR, "invalid AAC magic cookie\n");
122  return AVERROR_INVALIDDATA;
123  }
124  avio_skip(pb, skip);
125  } else if (st->codecpar->codec_id == AV_CODEC_ID_ALAC) {
126 #define ALAC_PREAMBLE 12
127 #define ALAC_HEADER 36
128 #define ALAC_NEW_KUKI 24
129  uint8_t preamble[12];
130  if (size < ALAC_NEW_KUKI) {
131  av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
132  avio_skip(pb, size);
133  return AVERROR_INVALIDDATA;
134  }
135  if (avio_read(pb, preamble, ALAC_PREAMBLE) != ALAC_PREAMBLE) {
136  av_log(s, AV_LOG_ERROR, "failed to read preamble\n");
137  return AVERROR_INVALIDDATA;
138  }
139 
140  av_freep(&st->codecpar->extradata);
142  return AVERROR(ENOMEM);
143 
144  /* For the old style cookie, we skip 12 bytes, then read 36 bytes.
145  * The new style cookie only contains the last 24 bytes of what was
146  * 36 bytes in the old style cookie, so we fabricate the first 12 bytes
147  * in that case to maintain compatibility. */
148  if (!memcmp(&preamble[4], "frmaalac", 8)) {
149  if (size < ALAC_PREAMBLE + ALAC_HEADER) {
150  av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
151  av_freep(&st->codecpar->extradata);
152  return AVERROR_INVALIDDATA;
153  }
154  if (avio_read(pb, st->codecpar->extradata, ALAC_HEADER) != ALAC_HEADER) {
155  av_log(s, AV_LOG_ERROR, "failed to read kuki header\n");
156  av_freep(&st->codecpar->extradata);
157  return AVERROR_INVALIDDATA;
158  }
159  avio_skip(pb, size - ALAC_PREAMBLE - ALAC_HEADER);
160  } else {
161  AV_WB32(st->codecpar->extradata, 36);
162  memcpy(&st->codecpar->extradata[4], "alac", 4);
163  AV_WB32(&st->codecpar->extradata[8], 0);
164  memcpy(&st->codecpar->extradata[12], preamble, 12);
165  if (avio_read(pb, &st->codecpar->extradata[24], ALAC_NEW_KUKI - 12) != ALAC_NEW_KUKI - 12) {
166  av_log(s, AV_LOG_ERROR, "failed to read new kuki header\n");
167  av_freep(&st->codecpar->extradata);
168  return AVERROR_INVALIDDATA;
169  }
170  avio_skip(pb, size - ALAC_NEW_KUKI);
171  }
172  } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
173  // The data layout for Opus is currently unknown, so we do not export
174  // extradata at all. Multichannel streams are not supported.
175  if (st->codecpar->channels > 2) {
176  avpriv_request_sample(s, "multichannel Opus in CAF");
177  return AVERROR_PATCHWELCOME;
178  }
179  avio_skip(pb, size);
180  } else {
181  av_freep(&st->codecpar->extradata);
182  if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
183  return AVERROR(ENOMEM);
184  }
185 
186  return 0;
187 }
188 
189 /** Read packet table chunk */
190 static int read_pakt_chunk(AVFormatContext *s, int64_t size)
191 {
192  AVIOContext *pb = s->pb;
193  AVStream *st = s->streams[0];
194  CafContext *caf = s->priv_data;
195  int64_t pos = 0, ccount, num_packets;
196  int i;
197  int ret;
198 
199  ccount = avio_tell(pb);
200 
201  num_packets = avio_rb64(pb);
202  if (num_packets < 0 || INT32_MAX / sizeof(AVIndexEntry) < num_packets)
203  return AVERROR_INVALIDDATA;
204 
205  st->nb_frames = avio_rb64(pb); /* valid frames */
206  st->nb_frames += avio_rb32(pb); /* priming frames */
207  st->nb_frames += avio_rb32(pb); /* remainder frames */
208 
209  if (caf->bytes_per_packet > 0 && caf->frames_per_packet > 0) {
210  st->duration = caf->frames_per_packet * num_packets;
211  pos = caf-> bytes_per_packet * num_packets;
212  } else {
213  st->duration = 0;
214  for (i = 0; i < num_packets; i++) {
215  if (avio_feof(pb))
216  return AVERROR_INVALIDDATA;
217  ret = av_add_index_entry(s->streams[0], pos, st->duration, 0, 0, AVINDEX_KEYFRAME);
218  if (ret < 0)
219  return ret;
222  }
223  }
224 
225  if (avio_tell(pb) - ccount > size) {
226  av_log(s, AV_LOG_ERROR, "error reading packet table\n");
227  return AVERROR_INVALIDDATA;
228  }
229  avio_skip(pb, ccount + size - avio_tell(pb));
230 
231  caf->num_bytes = pos;
232  return 0;
233 }
234 
235 /** Read information chunk */
236 static void read_info_chunk(AVFormatContext *s, int64_t size)
237 {
238  AVIOContext *pb = s->pb;
239  unsigned int i;
240  unsigned int nb_entries = avio_rb32(pb);
241  for (i = 0; i < nb_entries && !avio_feof(pb); i++) {
242  char key[32];
243  char value[1024];
244  avio_get_str(pb, INT_MAX, key, sizeof(key));
245  avio_get_str(pb, INT_MAX, value, sizeof(value));
246  if (!*key)
247  continue;
248  av_dict_set(&s->metadata, key, value, 0);
249  }
250 }
251 
253 {
254  AVIOContext *pb = s->pb;
255  CafContext *caf = s->priv_data;
256  AVStream *st;
257  uint32_t tag = 0;
258  int found_data, ret;
259  int64_t size, pos;
260 
261  avio_skip(pb, 8); /* magic, version, file flags */
262 
263  /* audio description chunk */
264  if (avio_rb32(pb) != MKBETAG('d','e','s','c')) {
265  av_log(s, AV_LOG_ERROR, "desc chunk not present\n");
266  return AVERROR_INVALIDDATA;
267  }
268  size = avio_rb64(pb);
269  if (size != 32)
270  return AVERROR_INVALIDDATA;
271 
272  ret = read_desc_chunk(s);
273  if (ret)
274  return ret;
275  st = s->streams[0];
276 
277  /* parse each chunk */
278  found_data = 0;
279  while (!avio_feof(pb)) {
280 
281  /* stop at data chunk if seeking is not supported or
282  data chunk size is unknown */
283  if (found_data && (caf->data_size < 0 || !(pb->seekable & AVIO_SEEKABLE_NORMAL)))
284  break;
285 
286  tag = avio_rb32(pb);
287  size = avio_rb64(pb);
288  pos = avio_tell(pb);
289  if (avio_feof(pb))
290  break;
291 
292  switch (tag) {
293  case MKBETAG('d','a','t','a'):
294  avio_skip(pb, 4); /* edit count */
295  caf->data_start = avio_tell(pb);
296  caf->data_size = size < 0 ? -1 : size - 4;
297  if (caf->data_size > 0 && (pb->seekable & AVIO_SEEKABLE_NORMAL))
298  avio_skip(pb, caf->data_size);
299  found_data = 1;
300  break;
301 
302  case MKBETAG('c','h','a','n'):
303  if ((ret = ff_mov_read_chan(s, s->pb, st, size)) < 0)
304  return ret;
305  break;
306 
307  /* magic cookie chunk */
308  case MKBETAG('k','u','k','i'):
309  if (read_kuki_chunk(s, size))
310  return AVERROR_INVALIDDATA;
311  break;
312 
313  /* packet table chunk */
314  case MKBETAG('p','a','k','t'):
315  if (read_pakt_chunk(s, size))
316  return AVERROR_INVALIDDATA;
317  break;
318 
319  case MKBETAG('i','n','f','o'):
320  read_info_chunk(s, size);
321  break;
322 
323  default:
325  "skipping CAF chunk: %08"PRIX32" (%s), size %"PRId64"\n",
326  tag, av_fourcc2str(av_bswap32(tag)), size);
327  case MKBETAG('f','r','e','e'):
328  if (size < 0)
329  return AVERROR_INVALIDDATA;
330  break;
331  }
332 
333  if (size > 0) {
334  if (pos > INT64_MAX - size)
335  return AVERROR_INVALIDDATA;
336  avio_skip(pb, FFMAX(0, pos + size - avio_tell(pb)));
337  }
338  }
339 
340  if (!found_data)
341  return AVERROR_INVALIDDATA;
342 
343  if (caf->bytes_per_packet > 0 && caf->frames_per_packet > 0) {
344  if (caf->data_size > 0 && caf->data_size / caf->bytes_per_packet < INT64_MAX / caf->frames_per_packet)
345  st->nb_frames = (caf->data_size / caf->bytes_per_packet) * caf->frames_per_packet;
346  } else if (st->nb_index_entries && st->duration > 0) {
347  if (st->codecpar->sample_rate && caf->data_size / st->duration > INT64_MAX / st->codecpar->sample_rate / 8) {
348  av_log(s, AV_LOG_ERROR, "Overflow during bit rate calculation %d * 8 * %"PRId64"\n",
349  st->codecpar->sample_rate, caf->data_size / st->duration);
350  return AVERROR_INVALIDDATA;
351  }
352  st->codecpar->bit_rate = st->codecpar->sample_rate * 8LL *
353  (caf->data_size / st->duration);
354  } else {
355  av_log(s, AV_LOG_ERROR, "Missing packet table. It is required when "
356  "block size or frame size are variable.\n");
357  return AVERROR_INVALIDDATA;
358  }
359 
360  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
361  st->start_time = 0;
362 
363  /* position the stream at the start of data */
364  if (caf->data_size >= 0)
365  avio_seek(pb, caf->data_start, SEEK_SET);
366 
367  return 0;
368 }
369 
370 #define CAF_MAX_PKT_SIZE 4096
371 
373 {
374  AVIOContext *pb = s->pb;
375  AVStream *st = s->streams[0];
376  CafContext *caf = s->priv_data;
377  int res, pkt_size = 0, pkt_frames = 0;
378  int64_t left = CAF_MAX_PKT_SIZE;
379 
380  if (avio_feof(pb))
381  return AVERROR_EOF;
382 
383  /* don't read past end of data chunk */
384  if (caf->data_size > 0) {
385  left = (caf->data_start + caf->data_size) - avio_tell(pb);
386  if (!left)
387  return AVERROR_EOF;
388  if (left < 0)
389  return AVERROR(EIO);
390  }
391 
392  pkt_frames = caf->frames_per_packet;
393  pkt_size = caf->bytes_per_packet;
394 
395  if (pkt_size > 0 && pkt_frames == 1) {
396  pkt_size = (CAF_MAX_PKT_SIZE / pkt_size) * pkt_size;
397  pkt_size = FFMIN(pkt_size, left);
398  pkt_frames = pkt_size / caf->bytes_per_packet;
399  } else if (st->nb_index_entries) {
400  if (caf->packet_cnt < st->nb_index_entries - 1) {
401  pkt_size = st->index_entries[caf->packet_cnt + 1].pos - st->index_entries[caf->packet_cnt].pos;
402  pkt_frames = st->index_entries[caf->packet_cnt + 1].timestamp - st->index_entries[caf->packet_cnt].timestamp;
403  } else if (caf->packet_cnt == st->nb_index_entries - 1) {
404  pkt_size = caf->num_bytes - st->index_entries[caf->packet_cnt].pos;
405  pkt_frames = st->duration - st->index_entries[caf->packet_cnt].timestamp;
406  } else {
407  return AVERROR(EIO);
408  }
409  }
410 
411  if (pkt_size == 0 || pkt_frames == 0 || pkt_size > left)
412  return AVERROR(EIO);
413 
414  res = av_get_packet(pb, pkt, pkt_size);
415  if (res < 0)
416  return res;
417 
418  pkt->size = res;
419  pkt->stream_index = 0;
420  pkt->dts = pkt->pts = caf->frame_cnt;
421 
422  caf->packet_cnt++;
423  caf->frame_cnt += pkt_frames;
424 
425  return 0;
426 }
427 
428 static int read_seek(AVFormatContext *s, int stream_index,
429  int64_t timestamp, int flags)
430 {
431  AVStream *st = s->streams[0];
432  CafContext *caf = s->priv_data;
433  int64_t pos, packet_cnt, frame_cnt;
434 
435  timestamp = FFMAX(timestamp, 0);
436 
437  if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) {
438  /* calculate new byte position based on target frame position */
439  pos = caf->bytes_per_packet * (timestamp / caf->frames_per_packet);
440  if (caf->data_size > 0)
441  pos = FFMIN(pos, caf->data_size);
442  packet_cnt = pos / caf->bytes_per_packet;
443  frame_cnt = caf->frames_per_packet * packet_cnt;
444  } else if (st->nb_index_entries) {
445  packet_cnt = av_index_search_timestamp(st, timestamp, flags);
446  frame_cnt = st->index_entries[packet_cnt].timestamp;
447  pos = st->index_entries[packet_cnt].pos;
448  } else {
449  return -1;
450  }
451 
452  if (avio_seek(s->pb, pos + caf->data_start, SEEK_SET) < 0)
453  return -1;
454 
455  caf->packet_cnt = packet_cnt;
456  caf->frame_cnt = frame_cnt;
457 
458  return 0;
459 }
460 
462  .name = "caf",
463  .long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
464  .priv_data_size = sizeof(CafContext),
465  .read_probe = probe,
468  .read_seek = read_seek,
469  .codec_tag = (const AVCodecTag* const []){ ff_codec_caf_tags, 0 },
470 };
#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
int size
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: cafdec.c:372
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:2048
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3136
#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:4899
int64_t pos
Definition: avformat.h:803
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3900
int size
Definition: avcodec.h:1446
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1103
CAF common code.
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
const char * key
static AVPacket pkt
#define CAF_MAX_PKT_SIZE
Definition: cafdec.c:370
static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: cafdec.c:428
static int read_header(AVFormatContext *s)
Definition: cafdec.c:252
Format I/O context.
Definition: avformat.h:1351
#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:102
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:800
#define AV_RB32
Definition: intreadwrite.h:130
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4469
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
uint32_t tag
Definition: movenc.c:1478
#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:313
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:921
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:647
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3929
#define AVINDEX_KEYFRAME
Definition: avformat.h:810
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:258
#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:1591
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2159
int ff_mp4_read_descr_len(AVIOContext *pb)
Definition: isom.c:457
#define AV_RB16
Definition: intreadwrite.h:53
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:769
#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:804
#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: avcodec.h:3896
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:450
int block_align
Audio only.
Definition: avcodec.h:4017
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
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:3299
#define FFMIN(a, b)
Definition: common.h:96
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
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:461
#define s(width, name)
Definition: cbs_vp9.c:257
#define ALAC_NEW_KUKI
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
int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb)
Definition: mov_esds.c:23
Stream structure.
Definition: avformat.h:874
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
#define av_bswap32
Definition: bswap.h:33
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
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
int nb_index_entries
Definition: avformat.h:1105
double value
Definition: eval.c:98
#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:236
static enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
Compute codec id for &#39;lpcm&#39; tag.
Definition: isom.h:370
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
static int read_pakt_chunk(AVFormatContext *s, int64_t size)
Read packet table chunk.
Definition: cafdec.c:190
#define flags(name, subs,...)
Definition: cbs_av1.c:610
static int probe(AVProbeData *p)
Definition: cafdec.c:51
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:923
int sample_rate
Audio only.
Definition: avcodec.h:4010
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
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:913
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:3317
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:925
#define ALAC_HEADER
#define MKBETAG(a, b, c, d)
Definition: common.h:367
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:782
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: avcodec.h:3942
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3914
int channels
Audio only.
Definition: avcodec.h:4006
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1444
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1021
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:879
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:358
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3904
static int read_desc_chunk(AVFormatContext *s)
Read audio description chunk.
Definition: cafdec.c:59
int stream_index
Definition: avcodec.h:1447
const AVCodecTag ff_codec_caf_tags[]
Known codec tags for CAF.
Definition: caf.c:34
#define MKTAG(a, b, c, d)
Definition: common.h:366
This structure stores compressed data.
Definition: avcodec.h:1422
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:1438