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/dict.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "pcm.h"
27 #include "aiff.h"
28 #include "id3v2.h"
29 #include "mov_chan.h"
30 #include "replaygain.h"
31 
32  #define AIFF 0
33  #define AIFF_C_VERSION1 0xA2805140
34 
35  typedef struct AIFFInputContext {
36   int64_t data_end;
37   int block_duration;
38 } AIFFInputContext;
39 
40  static enum AVCodecID aiff_codec_get_id(int bps)
41 {
42  if (bps <= 8)
43  return AV_CODEC_ID_PCM_S8;
44  if (bps <= 16)
45  return AV_CODEC_ID_PCM_S16BE;
46  if (bps <= 24)
47  return AV_CODEC_ID_PCM_S24BE;
48  if (bps <= 32)
49  return AV_CODEC_ID_PCM_S32BE;
50 
51  /* bigger than 32 isn't allowed */
52  return AV_CODEC_ID_NONE;
53 }
54 
55 /* returns the size of the found tag */
56  static int get_tag(AVIOContext *pb, uint32_t * tag)
57 {
58  int size;
59 
60  if (avio_feof(pb))
61  return AVERROR(EIO);
62 
63  *tag = avio_rl32(pb);
64  size = avio_rb32(pb);
65 
66  if (size < 0)
67  size = 0x7fffffff;
68 
69  return size;
70 }
71 
72 /* Metadata string read */
73  static void get_meta(AVFormatContext *s, const char *key, int size)
74 {
75  uint8_t *str = av_malloc(size+1);
76 
77  if (str) {
78  int res = avio_read(s->pb, str, size);
79  if (res < 0){
80  av_free(str);
81  return;
82  }
83  size -= res;
84  str[res] = 0;
85  av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
86  }
87 
88  avio_skip(s->pb, size);
89 }
90 
91 /* Returns the number of sound data frames or negative on error */
92  static int get_aiff_header(AVFormatContext *s, int size,
93  unsigned version)
94 {
95  AVIOContext *pb = s->pb;
96  AVCodecParameters *par = s->streams[0]->codecpar;
97  AIFFInputContext *aiff = s->priv_data;
98  int exp;
99  uint64_t val;
100  int sample_rate;
101  unsigned int num_frames;
102 
103  if (size == INT_MAX)
104  return AVERROR_INVALIDDATA;
105 
106  if (size & 1)
107  size++;
108  par->codec_type = AVMEDIA_TYPE_AUDIO;
109  par->channels = avio_rb16(pb);
110  num_frames = avio_rb32(pb);
111  par->bits_per_coded_sample = avio_rb16(pb);
112 
113  exp = avio_rb16(pb) - 16383 - 63;
114  val = avio_rb64(pb);
115  if (exp <-63 || exp >63) {
116  av_log(s, AV_LOG_ERROR, "exp %d is out of range\n", exp);
117  return AVERROR_INVALIDDATA;
118  }
119  if (exp >= 0)
120  sample_rate = val << exp;
121  else
122  sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
123  if (sample_rate <= 0)
124  return AVERROR_INVALIDDATA;
125 
126  par->sample_rate = sample_rate;
127  if (size < 18)
128  return AVERROR_INVALIDDATA;
129  size -= 18;
130 
131  /* get codec id for AIFF-C */
132  if (size < 4) {
133  version = AIFF;
134  } else if (version == AIFF_C_VERSION1) {
135  par->codec_tag = avio_rl32(pb);
136  par->codec_id = ff_codec_get_id(ff_codec_aiff_tags, par->codec_tag);
137  if (par->codec_id == AV_CODEC_ID_NONE)
138  avpriv_request_sample(s, "unknown or unsupported codec tag: %s",
139  av_fourcc2str(par->codec_tag));
140  size -= 4;
141  }
142 
143  if (version != AIFF_C_VERSION1 || par->codec_id == AV_CODEC_ID_PCM_S16BE) {
144  par->codec_id = aiff_codec_get_id(par->bits_per_coded_sample);
145  par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);
146  aiff->block_duration = 1;
147  } else {
148  switch (par->codec_id) {
149  case AV_CODEC_ID_PCM_F32BE:
150  case AV_CODEC_ID_PCM_F64BE:
151  case AV_CODEC_ID_PCM_S16LE:
152  case AV_CODEC_ID_PCM_ALAW:
153  case AV_CODEC_ID_PCM_MULAW:
154  aiff->block_duration = 1;
155  break;
156  case AV_CODEC_ID_ADPCM_IMA_QT:
157  par->block_align = 34 * par->channels;
158  break;
159  case AV_CODEC_ID_MACE3:
160  par->block_align = 2 * par->channels;
161  break;
162  case AV_CODEC_ID_ADPCM_G726LE:
163  par->bits_per_coded_sample = 5;
164  case AV_CODEC_ID_ADPCM_IMA_WS:
165  case AV_CODEC_ID_ADPCM_G722:
166  case AV_CODEC_ID_MACE6:
167  case AV_CODEC_ID_SDX2_DPCM:
168  par->block_align = 1 * par->channels;
169  break;
170  case AV_CODEC_ID_GSM:
171  par->block_align = 33;
172  break;
173  default:
174  aiff->block_duration = 1;
175  break;
176  }
177  if (par->block_align > 0)
178  aiff->block_duration = av_get_audio_frame_duration2(par,
179  par->block_align);
180  }
181 
182  /* Block align needs to be computed in all cases, as the definition
183  * is specific to applications -> here we use the WAVE format definition */
184  if (!par->block_align)
185  par->block_align = (av_get_bits_per_sample(par->codec_id) * par->channels) >> 3;
186 
187  if (aiff->block_duration) {
188  par->bit_rate = av_rescale(par->sample_rate, par->block_align * 8LL,
189  aiff->block_duration);
190  if (par->bit_rate < 0)
191  par->bit_rate = 0;
192  }
193 
194  /* Chunk is over */
195  if (size)
196  avio_skip(pb, size);
197 
198  return num_frames;
199 }
200 
201  static int aiff_probe(const AVProbeData *p)
202 {
203  /* check file header */
204  if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
205  p->buf[2] == 'R' && p->buf[3] == 'M' &&
206  p->buf[8] == 'A' && p->buf[9] == 'I' &&
207  p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
208  return AVPROBE_SCORE_MAX;
209  else
210  return 0;
211 }
212 
213 /* aiff input */
214  static int aiff_read_header(AVFormatContext *s)
215 {
216  int ret, size, filesize;
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;
224 
225  /* check FORM header */
226  filesize = get_tag(pb, &tag);
227  if (filesize < 0 || 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  if (size >= 0x7fffffff - 8)
255  filesize = 0;
256  else
257  filesize -= size + 8;
258 
259  switch (tag) {
260  case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
261  /* Then for the complete header info */
262  st->nb_frames = get_aiff_header(s, size, version);
263  if (st->nb_frames < 0)
264  return st->nb_frames;
265  if (offset > 0) // COMM is after SSND
266  goto got_sound;
267  break;
268  case MKTAG('I', 'D', '3', ' '):
269  position = avio_tell(pb);
270  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
271  if (id3v2_extra_meta)
272  if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0 ||
273  (ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0) {
274  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
275  return ret;
276  }
277  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
278  if (position + size > avio_tell(pb))
279  avio_skip(pb, position + size - avio_tell(pb));
280  break;
281  case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
282  version = avio_rb32(pb);
283  break;
284  case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
285  get_meta(s, "title" , size);
286  break;
287  case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
288  get_meta(s, "author" , size);
289  break;
290  case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
291  get_meta(s, "copyright", size);
292  break;
293  case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
294  get_meta(s, "comment" , size);
295  break;
296  case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
297  if (size < 8)
298  return AVERROR_INVALIDDATA;
299  aiff->data_end = avio_tell(pb) + size;
300  offset = avio_rb32(pb); /* Offset of sound data */
301  avio_rb32(pb); /* BlockSize... don't care */
302  offset += avio_tell(pb); /* Compute absolute data offset */
303  if (st->codecpar->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) /* Assume COMM already parsed */
304  goto got_sound;
305  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
306  av_log(s, AV_LOG_ERROR, "file is not seekable\n");
307  return -1;
308  }
309  avio_skip(pb, size - 8);
310  break;
311  case MKTAG('w', 'a', 'v', 'e'):
312  if ((uint64_t)size > (1<<30))
313  return AVERROR_INVALIDDATA;
314  if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
315  return ret;
316  if ( (st->codecpar->codec_id == AV_CODEC_ID_QDMC || st->codecpar->codec_id == AV_CODEC_ID_QDM2)
317  && size>=12*4 && !st->codecpar->block_align) {
318  st->codecpar->block_align = AV_RB32(st->codecpar->extradata+11*4);
319  aiff->block_duration = AV_RB32(st->codecpar->extradata+9*4);
320  } else if (st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
321  char rate = 0;
322  if (size >= 25)
323  rate = st->codecpar->extradata[24];
324  switch (rate) {
325  case 'H': // RATE_HALF
326  st->codecpar->block_align = 17;
327  break;
328  case 'F': // RATE_FULL
329  default:
330  st->codecpar->block_align = 35;
331  }
332  aiff->block_duration = 160;
333  st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate * (st->codecpar->block_align << 3) /
334  aiff->block_duration;
335  }
336  break;
337  case MKTAG('C','H','A','N'):
338  if ((ret = ff_mov_read_chan(s, pb, st, size)) < 0)
339  return ret;
340  break;
341  case MKTAG('A','P','C','M'): /* XA ADPCM compressed sound chunk */
342  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_XA;
343  aiff->data_end = avio_tell(pb) + size;
344  offset = avio_tell(pb) + 8;
345  /* This field is unknown and its data seems to be irrelevant */
346  avio_rb32(pb);
347  st->codecpar->block_align = avio_rb32(pb);
348 
349  goto got_sound;
350  break;
351  case 0:
352  if (offset > 0 && st->codecpar->block_align) // COMM && SSND
353  goto got_sound;
354  default: /* Jump */
355  avio_skip(pb, size);
356  }
357 
358  /* Skip required padding byte for odd-sized chunks. */
359  if (size & 1) {
360  filesize--;
361  avio_skip(pb, 1);
362  }
363  }
364 
365  ret = ff_replaygain_export(st, s->metadata);
366  if (ret < 0)
367  return ret;
368 
369 got_sound:
370  if (!st->codecpar->block_align && st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
371  av_log(s, AV_LOG_WARNING, "qcelp without wave chunk, assuming full rate\n");
372  st->codecpar->block_align = 35;
373  } else if (st->codecpar->block_align <= 0) {
374  av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
375  return AVERROR_INVALIDDATA;
376  }
377 
378  /* Now positioned, get the sound data start and end */
379  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
380  st->start_time = 0;
381  st->duration = st->nb_frames * aiff->block_duration;
382 
383  /* Position the stream at the first block */
384  avio_seek(pb, offset, SEEK_SET);
385 
386  return 0;
387 }
388 
389  #define MAX_SIZE 4096
390 
391  static int aiff_read_packet(AVFormatContext *s,
392  AVPacket *pkt)
393 {
394  AVStream *st = s->streams[0];
395  AIFFInputContext *aiff = s->priv_data;
396  int64_t max_size;
397  int res, size;
398 
399  /* calculate size of remaining data */
400  max_size = aiff->data_end - avio_tell(s->pb);
401  if (max_size <= 0)
402  return AVERROR_EOF;
403 
404  if (!st->codecpar->block_align) {
405  av_log(s, AV_LOG_ERROR, "block_align not set\n");
406  return AVERROR_INVALIDDATA;
407  }
408 
409  /* Now for that packet */
410  switch (st->codecpar->codec_id) {
411  case AV_CODEC_ID_ADPCM_IMA_QT:
412  case AV_CODEC_ID_GSM:
413  case AV_CODEC_ID_QDM2:
414  case AV_CODEC_ID_QCELP:
415  size = st->codecpar->block_align;
416  break;
417  default:
418  size = st->codecpar->block_align ? (MAX_SIZE / st->codecpar->block_align) * st->codecpar->block_align : MAX_SIZE;
419  if (!size)
420  return AVERROR_INVALIDDATA;
421  }
422  size = FFMIN(max_size, size);
423  res = av_get_packet(s->pb, pkt, size);
424  if (res < 0)
425  return res;
426 
427  if (size >= st->codecpar->block_align)
428  pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
429  /* Only one stream in an AIFF file */
430  pkt->stream_index = 0;
431  pkt->duration = (res / st->codecpar->block_align) * aiff->block_duration;
432  return 0;
433 }
434 
435  const AVInputFormat ff_aiff_demuxer = {
436  .name = "aiff",
437  .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
438  .priv_data_size = sizeof(AIFFInputContext),
439  .read_probe = aiff_probe,
440  .read_header = aiff_read_header,
441  .read_packet = aiff_read_packet,
442  .read_seek = ff_pcm_read_seek,
443  .codec_tag = ff_aiff_codec_tags_list,
444 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:314
AV_CODEC_ID_MACE6
@ AV_CODEC_ID_MACE6
Definition: codec_id.h:433
AIFFInputContext::data_end
int64_t data_end
Definition: aiffdec.c:36
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AV_CODEC_ID_PCM_F32BE
@ AV_CODEC_ID_PCM_F32BE
Definition: codec_id.h:334
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
AV_CODEC_ID_ADPCM_IMA_QT
@ AV_CODEC_ID_ADPCM_IMA_QT
Definition: codec_id.h:353
AVERROR
Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:768
pcm.h
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
MAX_SIZE
#define MAX_SIZE
Definition: aiffdec.c:389
ff_get_extradata
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:469
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
ff_replaygain_export
int ff_replaygain_export(AVStream *st, AVDictionary *metadata)
Parse replaygain tags and export them as per-stream side data.
Definition: replaygain.c:90
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
id3v2.h
aiff_read_packet
static int aiff_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: aiffdec.c:391
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.
Definition: id3v2.c:1135
AV_CODEC_ID_ADPCM_G722
@ AV_CODEC_ID_ADPCM_G722
Definition: codec_id.h:381
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:391
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
sample_rate
sample_rate
Definition: ffmpeg_filter.c:153
AIFFInputContext
Definition: aiffdec.c:35
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
av_get_audio_frame_duration2
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:816
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:459
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:315
AIFF_C_VERSION1
#define AIFF_C_VERSION1
Definition: aiffdec.c:33
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:149
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:504
val
static double val(void *priv, double ch)
Definition: aeval.c:76
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:985
ff_id3v2_parse_chapters
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta *cur)
Create chapters for all CHAP tags found in the ID3v2 header.
Definition: id3v2.c:1188
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:72
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:580
AV_CODEC_ID_PCM_S8
@ AV_CODEC_ID_PCM_S8
Definition: codec_id.h:318
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:790
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AV_CODEC_ID_MACE3
@ AV_CODEC_ID_MACE3
Definition: codec_id.h:432
AVInputFormat
Definition: avformat.h:650
AV_PKT_FLAG_CORRUPT
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: packet.h:429
ID3v2ExtraMeta
Definition: id3v2.h:84
ff_codec_aiff_tags
const AVCodecTag ff_codec_aiff_tags[]
Definition: aiff.c:26
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:655
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:449
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
get_meta
static void get_meta(AVFormatContext *s, const char *key, int size)
Definition: aiffdec.c:73
AV_CODEC_ID_PCM_MULAW
@ AV_CODEC_ID_PCM_MULAW
Definition: codec_id.h:320
key
const char * key
Definition: hwcontext_opencl.c:168
aiff_probe
static int aiff_probe(const AVProbeData *p)
Definition: aiffdec.c:201
if
if(ret)
Definition: filter_design.txt:179
AVFormatContext
Format I/O context.
Definition: avformat.h:1200
AV_CODEC_ID_PCM_ALAW
@ AV_CODEC_ID_PCM_ALAW
Definition: codec_id.h:321
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1095
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AV_CODEC_ID_ADPCM_IMA_WS
@ AV_CODEC_ID_ADPCM_IMA_WS
Definition: codec_id.h:357
aiff.h
AIFFInputContext::block_duration
int block_duration
Definition: aiffdec.c:37
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:1157
avio_rb64
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:937
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:447
AV_CODEC_ID_QDM2
@ AV_CODEC_ID_QDM2
Definition: codec_id.h:442
exp
int8_t exp
Definition: eval.c:72
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AV_CODEC_ID_ADPCM_XA
@ AV_CODEC_ID_ADPCM_XA
Definition: codec_id.h:361
AV_CODEC_ID_GSM
@ AV_CODEC_ID_GSM
as in Berlin toast format
Definition: codec_id.h:441
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:987
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:47
AV_CODEC_ID_QCELP
@ AV_CODEC_ID_QCELP
Definition: codec_id.h:447
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
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:117
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:357
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:262
ff_aiff_demuxer
const AVInputFormat ff_aiff_demuxer
Definition: aiffdec.c:435
bps
unsigned bps
Definition: movenc.c:1597
size
int size
Definition: twinvq_data.h:10344
ID3v2_DEFAULT_MAGIC
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
AV_CODEC_ID_QDMC
@ AV_CODEC_ID_QDMC
Definition: codec_id.h:473
aiff_codec_get_id
static enum AVCodecID aiff_codec_get_id(int bps)
Definition: aiffdec.c:40
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:96
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:379
version
version
Definition: libkvazaar.c:313
get_tag
static int get_tag(AVIOContext *pb, uint32_t *tag)
Definition: aiffdec.c:56
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
AIFF
#define AIFF
Definition: aiffdec.c:32
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:177
AV_CODEC_ID_PCM_F64BE
@ AV_CODEC_ID_PCM_F64BE
Definition: codec_id.h:336
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AV_CODEC_ID_PCM_S32BE
@ AV_CODEC_ID_PCM_S32BE
Definition: codec_id.h:323
av_rescale
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:128
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:197
mov_chan.h
tag
uint32_t tag
Definition: movenc.c:1596
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:935
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:260
ff_pcm_read_seek
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:56
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:775
avformat.h
dict.h
AV_CODEC_ID_ADPCM_G726LE
@ AV_CODEC_ID_ADPCM_G726LE
Definition: codec_id.h:388
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:641
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, 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:1196
AVPacket::stream_index
int stream_index
Definition: packet.h:375
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:347
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
AV_CODEC_ID_SDX2_DPCM
@ AV_CODEC_ID_SDX2_DPCM
Definition: codec_id.h:418
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:37
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
ff_aiff_codec_tags_list
const AVCodecTag *const ff_aiff_codec_tags_list[]
Definition: aiff.c:54
AVPacket
This structure stores compressed data.
Definition: packet.h:350
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:70
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:1141
convert_header.str
string str
Definition: convert_header.py:20
replaygain.h
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
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:975
AV_CODEC_ID_PCM_S24BE
@ AV_CODEC_ID_PCM_S24BE
Definition: codec_id.h:327
get_aiff_header
static int get_aiff_header(AVFormatContext *s, int size, unsigned version)
Definition: aiffdec.c:92
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
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:554
aiff_read_header
static int aiff_read_header(AVFormatContext *s)
Definition: aiffdec.c:214
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:375
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