FFmpeg: libavformat/aiffdec.c Source File

FFmpeg
aiffdec.c
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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 
33  #define AIFF 0
34  #define AIFF_C_VERSION1 0xA2805140
35 
36  typedef struct AIFFInputContext {
37   int64_t data_end;
38   int block_duration;
39 } AIFFInputContext;
40 
41  static enum AVCodecID aiff_codec_get_id(int bps)
42 {
43  if (bps <= 8)
44  return AV_CODEC_ID_PCM_S8;
45  if (bps <= 16)
46  return AV_CODEC_ID_PCM_S16BE;
47  if (bps <= 24)
48  return AV_CODEC_ID_PCM_S24BE;
49  if (bps <= 32)
50  return AV_CODEC_ID_PCM_S32BE;
51 
52  /* bigger than 32 isn't allowed */
53  return AV_CODEC_ID_NONE;
54 }
55 
56 /* returns the size of the found tag */
57  static int get_tag(AVIOContext *pb, uint32_t * tag)
58 {
59  int size;
60 
61  if (avio_feof(pb))
62  return AVERROR(EIO);
63 
64  *tag = avio_rl32(pb);
65  size = avio_rb32(pb);
66 
67  if (size < 0)
68  size = 0x7fffffff;
69 
70  return size;
71 }
72 
73 /* Metadata string read */
74  static void get_meta(AVFormatContext *s, const char *key, int size)
75 {
76  uint8_t *str = av_malloc(size+1);
77 
78  if (str) {
79  int res = avio_read(s->pb, str, size);
80  if (res < 0){
81  av_free(str);
82  return;
83  }
84  size += (size&1)-res;
85  str[res] = 0;
86  av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
87  }else
88  size+= size&1;
89 
90  avio_skip(s->pb, size);
91 }
92 
93 /* Returns the number of sound data frames or negative on error */
94  static int get_aiff_header(AVFormatContext *s, int size,
95  unsigned version)
96 {
97  AVIOContext *pb = s->pb;
98  AVCodecContext *codec = s->streams[0]->codec;
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++;
107  codec->codec_type = AVMEDIA_TYPE_AUDIO;
108  codec->channels = avio_rb16(pb);
109  num_frames = avio_rb32(pb);
110  codec->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  codec->sample_rate = sample_rate;
123  size -= 18;
124 
125  /* get codec id for AIFF-C */
126  if (size < 4) {
127  version = AIFF;
128  } else if (version == AIFF_C_VERSION1) {
129  codec->codec_tag = avio_rl32(pb);
130  codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
131  if (codec->codec_id == AV_CODEC_ID_NONE) {
132  char tag[32];
133  av_get_codec_tag_string(tag, sizeof(tag), codec->codec_tag);
134  avpriv_request_sample(s, "unknown or unsupported codec tag: %s", tag);
135  }
136  size -= 4;
137  }
138 
139  if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
140  codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
141  codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
142  aiff->block_duration = 1;
143  } else {
144  switch (codec->codec_id) {
145  case AV_CODEC_ID_PCM_F32BE:
146  case AV_CODEC_ID_PCM_F64BE:
147  case AV_CODEC_ID_PCM_S16LE:
148  case AV_CODEC_ID_PCM_ALAW:
149  case AV_CODEC_ID_PCM_MULAW:
150  aiff->block_duration = 1;
151  break;
152  case AV_CODEC_ID_ADPCM_IMA_QT:
153  codec->block_align = 34*codec->channels;
154  break;
155  case AV_CODEC_ID_MACE3:
156  codec->block_align = 2*codec->channels;
157  break;
158  case AV_CODEC_ID_ADPCM_G726LE:
159  codec->bits_per_coded_sample = 5;
160  case AV_CODEC_ID_ADPCM_IMA_WS:
161  case AV_CODEC_ID_ADPCM_G722:
162  case AV_CODEC_ID_MACE6:
163  case AV_CODEC_ID_SDX2_DPCM:
164  codec->block_align = 1*codec->channels;
165  break;
166  case AV_CODEC_ID_GSM:
167  codec->block_align = 33;
168  break;
169  default:
170  aiff->block_duration = 1;
171  break;
172  }
173  if (codec->block_align > 0)
174  aiff->block_duration = av_get_audio_frame_duration(codec,
175  codec->block_align);
176  }
177 
178  /* Block align needs to be computed in all cases, as the definition
179  * is specific to applications -> here we use the WAVE format definition */
180  if (!codec->block_align)
181  codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3;
182 
183  if (aiff->block_duration) {
184  codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
185  aiff->block_duration;
186  }
187 
188  /* Chunk is over */
189  if (size)
190  avio_skip(pb, size);
191 
192  return num_frames;
193 }
194 
195  static int aiff_probe(AVProbeData *p)
196 {
197  /* check file header */
198  if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
199  p->buf[2] == 'R' && p->buf[3] == 'M' &&
200  p->buf[8] == 'A' && p->buf[9] == 'I' &&
201  p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
202  return AVPROBE_SCORE_MAX;
203  else
204  return 0;
205 }
206 
207 /* aiff input */
208  static int aiff_read_header(AVFormatContext *s)
209 {
210  int ret, size, filesize;
211  int64_t offset = 0, position;
212  uint32_t tag;
213  unsigned version = AIFF_C_VERSION1;
214  AVIOContext *pb = s->pb;
215  AVStream * st;
216  AIFFInputContext *aiff = s->priv_data;
217  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
218 
219  /* check FORM header */
220  filesize = get_tag(pb, &tag);
221  if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
222  return AVERROR_INVALIDDATA;
223 
224  /* AIFF data type */
225  tag = avio_rl32(pb);
226  if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
227  version = AIFF;
228  else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
229  return AVERROR_INVALIDDATA;
230 
231  filesize -= 4;
232 
233  st = avformat_new_stream(s, NULL);
234  if (!st)
235  return AVERROR(ENOMEM);
236 
237  while (filesize > 0) {
238  /* parse different chunks */
239  size = get_tag(pb, &tag);
240 
241  if (size == AVERROR_EOF && offset > 0 && st->codec->block_align) {
242  av_log(s, AV_LOG_WARNING, "header parser hit EOF\n");
243  goto got_sound;
244  }
245  if (size < 0)
246  return size;
247 
248  filesize -= size + 8;
249 
250  switch (tag) {
251  case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
252  /* Then for the complete header info */
253  st->nb_frames = get_aiff_header(s, size, version);
254  if (st->nb_frames < 0)
255  return st->nb_frames;
256  if (offset > 0) // COMM is after SSND
257  goto got_sound;
258  break;
259  case MKTAG('I', 'D', '3', ' '):
260  position = avio_tell(pb);
261  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
262  if (id3v2_extra_meta)
263  if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
264  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
265  return ret;
266  }
267  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
268  if (position + size > avio_tell(pb))
269  avio_skip(pb, position + size - avio_tell(pb));
270  break;
271  case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
272  version = avio_rb32(pb);
273  break;
274  case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
275  get_meta(s, "title" , size);
276  break;
277  case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
278  get_meta(s, "author" , size);
279  break;
280  case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
281  get_meta(s, "copyright", size);
282  break;
283  case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
284  get_meta(s, "comment" , size);
285  break;
286  case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
287  aiff->data_end = avio_tell(pb) + size;
288  offset = avio_rb32(pb); /* Offset of sound data */
289  avio_rb32(pb); /* BlockSize... don't care */
290  offset += avio_tell(pb); /* Compute absolute data offset */
291  if (st->codec->block_align && !pb->seekable) /* Assume COMM already parsed */
292  goto got_sound;
293  if (!pb->seekable) {
294  av_log(s, AV_LOG_ERROR, "file is not seekable\n");
295  return -1;
296  }
297  avio_skip(pb, size - 8);
298  break;
299  case MKTAG('w', 'a', 'v', 'e'):
300  if ((uint64_t)size > (1<<30))
301  return -1;
302  if (ff_get_extradata(st->codec, pb, size) < 0)
303  return AVERROR(ENOMEM);
304  if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) {
305  st->codec->block_align = AV_RB32(st->codec->extradata+11*4);
306  aiff->block_duration = AV_RB32(st->codec->extradata+9*4);
307  } else if (st->codec->codec_id == AV_CODEC_ID_QCELP) {
308  char rate = 0;
309  if (size >= 25)
310  rate = st->codec->extradata[24];
311  switch (rate) {
312  case 'H': // RATE_HALF
313  st->codec->block_align = 17;
314  break;
315  case 'F': // RATE_FULL
316  default:
317  st->codec->block_align = 35;
318  }
319  aiff->block_duration = 160;
320  st->codec->bit_rate = st->codec->sample_rate * (st->codec->block_align << 3) /
321  aiff->block_duration;
322  }
323  break;
324  case MKTAG('C','H','A','N'):
325  if(ff_mov_read_chan(s, pb, st, size) < 0)
326  return AVERROR_INVALIDDATA;
327  break;
328  case 0:
329  if (offset > 0 && st->codec->block_align) // COMM && SSND
330  goto got_sound;
331  default: /* Jump */
332  if (size & 1) /* Always even aligned */
333  size++;
334  avio_skip(pb, size);
335  }
336  }
337 
338 got_sound:
339  if (!st->codec->block_align) {
340  av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
341  return -1;
342  }
343 
344  /* Now positioned, get the sound data start and end */
345  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
346  st->start_time = 0;
347  st->duration = st->nb_frames * aiff->block_duration;
348 
349  /* Position the stream at the first block */
350  avio_seek(pb, offset, SEEK_SET);
351 
352  return 0;
353 }
354 
355  #define MAX_SIZE 4096
356 
357  static int aiff_read_packet(AVFormatContext *s,
358  AVPacket *pkt)
359 {
360  AVStream *st = s->streams[0];
361  AIFFInputContext *aiff = s->priv_data;
362  int64_t max_size;
363  int res, size;
364 
365  /* calculate size of remaining data */
366  max_size = aiff->data_end - avio_tell(s->pb);
367  if (max_size <= 0)
368  return AVERROR_EOF;
369 
370  /* Now for that packet */
371  switch (st->codec->codec_id) {
372  case AV_CODEC_ID_ADPCM_IMA_QT:
373  case AV_CODEC_ID_GSM:
374  case AV_CODEC_ID_QDM2:
375  case AV_CODEC_ID_QCELP:
376  size = st->codec->block_align;
377  break;
378  default:
379  size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
380  }
381  size = FFMIN(max_size, size);
382  res = av_get_packet(s->pb, pkt, size);
383  if (res < 0)
384  return res;
385 
386  if (size >= st->codec->block_align)
387  pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
388  /* Only one stream in an AIFF file */
389  pkt->stream_index = 0;
390  pkt->duration = (res / st->codec->block_align) * aiff->block_duration;
391  return 0;
392 }
393 
394  AVInputFormat ff_aiff_demuxer = {
395  .name = "aiff",
396  .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
397  .priv_data_size = sizeof(AIFFInputContext),
398  .read_probe = aiff_probe,
399  .read_header = aiff_read_header,
400  .read_packet = aiff_read_packet,
401  .read_seek = ff_pcm_read_seek,
402  .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
403 };
AV_CODEC_ID_PCM_S24BE
Definition: avcodec.h:335
NULL
#define NULL
Definition: coverity.c:32
val
const char const char void * val
Definition: avisynth_c.h:634
get_aiff_header
static int get_aiff_header(AVFormatContext *s, int size, unsigned version)
Definition: aiffdec.c:94
s
const char * s
Definition: avisynth_c.h:631
AVIOContext
Bytestream IO Context.
Definition: avio.h:111
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AV_CODEC_ID_NONE
Definition: avcodec.h:102
AV_CODEC_ID_PCM_S8
Definition: avcodec.h:326
AIFFInputContext::data_end
int64_t data_end
Definition: aiffdec.c:37
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enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2821
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1597
avpriv_set_pts_info
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:4149
ff_get_extradata
int ff_get_extradata(AVCodecContext *avctx, 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:3000
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#define MAX_SIZE
Definition: aiffdec.c:355
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Definition: libcdio.c:153
ID3v2_DEFAULT_MAGIC
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Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
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int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:208
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:282
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size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
Put a string representing the codec tag codec_tag in buf.
Definition: utils.c:2668
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static int aiff_read_header(AVFormatContext *s)
Definition: aiffdec.c:208
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Definition: avisynth_c.h:629
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Definition: demuxing_decoding.c:54
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Definition: aviobuf.c:683
ff_id3v2_parse_apic
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:1078
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int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2324
AV_CODEC_ID_MACE6
Definition: avcodec.h:429
AV_CODEC_ID_ADPCM_G722
Definition: avcodec.h:386
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Format I/O context.
Definition: avformat.h:1314
dict.h
Public dictionary API.
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void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t
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Definition: audio_convert.c:194
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Definition: tableprint_vlc.h:31
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unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:698
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Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1485
AVCodecContext::extradata
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some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1647
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AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3805
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static int aiff_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: aiffdec.c:357
AV_RB32
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
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1382
AIFF_C_VERSION1
#define AIFF_C_VERSION1
Definition: aiffdec.c:34
AV_CODEC_ID_ADPCM_IMA_QT
Definition: avcodec.h:358
tag
uint32_t tag
Definition: movenc.c:1348
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
av_get_packet
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:252
size
ptrdiff_t size
Definition: opengl_enc.c:101
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uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:765
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static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:442
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int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2917
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#define av_log(a,...)
Definition: tableprint_vlc.h:28
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int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:545
AV_CODEC_ID_QDM2
Definition: avcodec.h:438
AV_CODEC_ID_PCM_ALAW
Definition: avcodec.h:329
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:101
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:3006
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AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1528
AV_CODEC_ID_MACE3
Definition: avcodec.h:428
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unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:667
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#define AVERROR(e)
Definition: error.h:43
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
ff_id3v2_free_extra_meta
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
Definition: id3v2.c:1062
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:194
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static void get_meta(AVFormatContext *s, const char *key, int size)
Definition: aiffdec.c:74
aiff_codec_get_id
static enum AVCodecID aiff_codec_get_id(int bps)
Definition: aiffdec.c:41
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static const uint8_t offset[127][2]
Definition: vf_spp.c:92
exp
int8_t exp
Definition: eval.c:63
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1473
AV_CODEC_ID_ADPCM_G726LE
Definition: avcodec.h:397
AVStream::codec
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:896
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:462
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:207
FFMIN
#define FFMIN(a, b)
Definition: common.h:96
AV_DICT_DONT_STRDUP_VAL
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:78
read_probe
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
AV_CODEC_ID_PCM_F64BE
Definition: avcodec.h:344
aiff_probe
static int aiff_probe(AVProbeData *p)
Definition: aiffdec.c:195
ff_pcm_read_seek
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:45
AV_CODEC_ID_PCM_S16BE
Definition: avcodec.h:323
AV_CODEC_ID_QCELP
Definition: avcodec.h:443
ff_mov_read_chan
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
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:638
mov_chan.h
AVStream
Stream structure.
Definition: avformat.h:877
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
get_tag
static int get_tag(AVIOContext *pb, uint32_t *tag)
Definition: aiffdec.c:57
AIFFInputContext::block_duration
int block_duration
Definition: aiffdec.c:38
sample_rate
sample_rate
Definition: ffmpeg_filter.c:190
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition: avcodec.h:1540
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:1549
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:2287
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1356
AVCodecContext
main external API structure.
Definition: avcodec.h:1532
AV_CODEC_ID_PCM_MULAW
Definition: avcodec.h:328
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1564
AV_CODEC_ID_PCM_F32BE
Definition: avcodec.h:342
av_dict_set
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
AV_CODEC_ID_ADPCM_IMA_WS
Definition: avcodec.h:362
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:460
av_get_audio_frame_duration
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
Return audio frame duration.
Definition: utils.c:3024
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:936
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:472
avformat.h
Main libavformat public API header.
ff_aiff_demuxer
AVInputFormat ff_aiff_demuxer
Definition: aiffdec.c:394
AV_CODEC_ID_SDX2_DPCM
Definition: avcodec.h:416
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:929
ff_codec_aiff_tags
static const AVCodecTag ff_codec_aiff_tags[]
Definition: aiff.h:33
AV_CODEC_ID_PCM_S16LE
Definition: avcodec.h:322
ff_id3v2_read
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 and chapters.
Definition: id3v2.c:1056
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:938
AV_PKT_FLAG_CORRUPT
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: avcodec.h:1500
bps
unsigned bps
Definition: movenc.c:1349
AIFF
#define AIFF
Definition: aiffdec.c:33
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AV_CODEC_ID_GSM
as in Berlin toast format
Definition: avcodec.h:437
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:2288
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1342
aiff.h
common header for AIFF muxer and demuxer
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
avio_feof
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:306
AVPacket::stream_index
int stream_index
Definition: avcodec.h:1469
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:342
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1444
AV_CODEC_ID_PCM_S32BE
Definition: avcodec.h:331
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