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 "demux.h"
26 #include "internal.h"
27 #include "pcm.h"
28 #include "aiff.h"
29 #include "id3v2.h"
30 #include "mov_chan.h"
31 #include "replaygain.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 int64_t get_tag(AVIOContext *pb, uint32_t * tag)
58 {
59  int64_t size;
60 
61  if (avio_feof(pb))
62  return AVERROR(EIO);
63 
64  *tag = avio_rl32(pb);
65  size = avio_rb32(pb);
66 
67  return size;
68 }
69 
70 /* Metadata string read */
71  static void get_meta(AVFormatContext *s, const char *key, int64_t size)
72 {
73  uint8_t *str = NULL;
74 
75  if (size < SIZE_MAX)
76  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 -= res;
85  str[res] = 0;
86  av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
87  }
88 
89  avio_skip(s->pb, size);
90 }
91 
92 /* Returns the number of sound data frames or negative on error */
93  static int get_aiff_header(AVFormatContext *s, int64_t size,
94  unsigned version)
95 {
96  AVIOContext *pb = s->pb;
97  AVCodecParameters *par = s->streams[0]->codecpar;
98  AIFFInputContext *aiff = s->priv_data;
99  int exp;
100  uint64_t val;
101  int sample_rate;
102  unsigned int num_frames;
103  int channels;
104 
105  if (size & 1)
106  size++;
107  par->codec_type = AVMEDIA_TYPE_AUDIO;
108  channels = avio_rb16(pb);
109  par->ch_layout.nb_channels = channels;
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 * channels;
158  break;
159  case AV_CODEC_ID_MACE3:
160  par->block_align = 2 * 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 * 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) * 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;
217  int64_t filesize, size;
218  int64_t offset = 0, position;
219  uint32_t tag;
220  unsigned version = AIFF_C_VERSION1;
221  AVIOContext *pb = s->pb;
222  AVStream * st;
223  AIFFInputContext *aiff = s->priv_data;
224  ID3v2ExtraMeta *id3v2_extra_meta;
225 
226  /* check FORM header */
227  filesize = get_tag(pb, &tag);
228  if (filesize < 4 || tag != MKTAG('F', 'O', 'R', 'M'))
229  return AVERROR_INVALIDDATA;
230 
231  /* AIFF data type */
232  tag = avio_rl32(pb);
233  if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
234  version = AIFF;
235  else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
236  return AVERROR_INVALIDDATA;
237 
238  filesize -= 4;
239 
240  st = avformat_new_stream(s, NULL);
241  if (!st)
242  return AVERROR(ENOMEM);
243 
244  while (filesize > 0) {
245  /* parse different chunks */
246  size = get_tag(pb, &tag);
247 
248  if (size == AVERROR_EOF && offset > 0 && st->codecpar->block_align) {
249  av_log(s, AV_LOG_WARNING, "header parser hit EOF\n");
250  goto got_sound;
251  }
252  if (size < 0)
253  return size;
254 
255  filesize -= size + 8;
256 
257  switch (tag) {
258  case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
259  /* Then for the complete header info */
260  st->nb_frames = get_aiff_header(s, size, version);
261  if (st->nb_frames < 0)
262  return st->nb_frames;
263  if (offset > 0) // COMM is after SSND
264  goto got_sound;
265  break;
266  case MKTAG('I', 'D', '3', ' '):
267  position = avio_tell(pb);
268  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
269  if (id3v2_extra_meta)
270  if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0 ||
271  (ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0) {
272  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
273  return ret;
274  }
275  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
276  if (position + size > avio_tell(pb))
277  avio_skip(pb, position + size - avio_tell(pb));
278  break;
279  case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
280  version = avio_rb32(pb);
281  break;
282  case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
283  get_meta(s, "title" , size);
284  break;
285  case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
286  get_meta(s, "author" , size);
287  break;
288  case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
289  get_meta(s, "copyright", size);
290  break;
291  case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
292  get_meta(s, "comment" , size);
293  break;
294  case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
295  if (size < 8)
296  return AVERROR_INVALIDDATA;
297  aiff->data_end = avio_tell(pb) + size;
298  offset = avio_rb32(pb); /* Offset of sound data */
299  avio_rb32(pb); /* BlockSize... don't care */
300  offset += avio_tell(pb); /* Compute absolute data offset */
301  if (st->codecpar->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) /* Assume COMM already parsed */
302  goto got_sound;
303  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
304  av_log(s, AV_LOG_ERROR, "file is not seekable\n");
305  return -1;
306  }
307  avio_skip(pb, size - 8);
308  break;
309  case MKTAG('w', 'a', 'v', 'e'):
310  if ((uint64_t)size > (1<<30))
311  return AVERROR_INVALIDDATA;
312  if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
313  return ret;
314  if ( (st->codecpar->codec_id == AV_CODEC_ID_QDMC || st->codecpar->codec_id == AV_CODEC_ID_QDM2)
315  && size>=12*4 && !st->codecpar->block_align) {
316  st->codecpar->block_align = AV_RB32(st->codecpar->extradata+11*4);
317  aiff->block_duration = AV_RB32(st->codecpar->extradata+9*4);
318  } else if (st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
319  char rate = 0;
320  if (size >= 25)
321  rate = st->codecpar->extradata[24];
322  switch (rate) {
323  case 'H': // RATE_HALF
324  st->codecpar->block_align = 17;
325  break;
326  case 'F': // RATE_FULL
327  default:
328  st->codecpar->block_align = 35;
329  }
330  aiff->block_duration = 160;
331  st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate * (st->codecpar->block_align << 3) /
332  aiff->block_duration;
333  }
334  break;
335  case MKTAG('C','H','A','N'):
336  if ((ret = ff_mov_read_chan(s, pb, st, size)) < 0)
337  return ret;
338  break;
339  case MKTAG('A','P','C','M'): /* XA ADPCM compressed sound chunk */
340  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_XA;
341  aiff->data_end = avio_tell(pb) + size;
342  offset = avio_tell(pb) + 8;
343  /* This field is unknown and its data seems to be irrelevant */
344  avio_rb32(pb);
345  st->codecpar->block_align = avio_rb32(pb);
346 
347  goto got_sound;
348  break;
349  case 0:
350  if (offset > 0 && st->codecpar->block_align) // COMM && SSND
351  goto got_sound;
352  default: /* Jump */
353  avio_skip(pb, size);
354  }
355 
356  /* Skip required padding byte for odd-sized chunks. */
357  if (size & 1) {
358  filesize--;
359  avio_skip(pb, 1);
360  }
361  }
362 
363  ret = ff_replaygain_export(st, s->metadata);
364  if (ret < 0)
365  return ret;
366 
367 got_sound:
368  if (!st->codecpar->block_align && st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
369  av_log(s, AV_LOG_WARNING, "qcelp without wave chunk, assuming full rate\n");
370  st->codecpar->block_align = 35;
371  } else if (st->codecpar->block_align <= 0) {
372  av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
373  return AVERROR_INVALIDDATA;
374  }
375 
376  /* Now positioned, get the sound data start and end */
377  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
378  st->start_time = 0;
379  st->duration = st->nb_frames * aiff->block_duration;
380 
381  /* Position the stream at the first block */
382  avio_seek(pb, offset, SEEK_SET);
383 
384  return 0;
385 }
386 
387  #define MAX_SIZE 4096
388 
389  static int aiff_read_packet(AVFormatContext *s,
390  AVPacket *pkt)
391 {
392  AVStream *st = s->streams[0];
393  AIFFInputContext *aiff = s->priv_data;
394  int64_t max_size;
395  int res, size;
396 
397  /* calculate size of remaining data */
398  max_size = aiff->data_end - avio_tell(s->pb);
399  if (max_size <= 0)
400  return AVERROR_EOF;
401 
402  if (!st->codecpar->block_align) {
403  av_log(s, AV_LOG_ERROR, "block_align not set\n");
404  return AVERROR_INVALIDDATA;
405  }
406 
407  /* Now for that packet */
408  switch (st->codecpar->codec_id) {
409  case AV_CODEC_ID_ADPCM_IMA_QT:
410  case AV_CODEC_ID_GSM:
411  case AV_CODEC_ID_QDM2:
412  case AV_CODEC_ID_QCELP:
413  size = st->codecpar->block_align;
414  break;
415  default:
416  size = st->codecpar->block_align ? (MAX_SIZE / st->codecpar->block_align) * st->codecpar->block_align : MAX_SIZE;
417  if (!size)
418  return AVERROR_INVALIDDATA;
419  }
420  size = FFMIN(max_size, size);
421  res = av_get_packet(s->pb, pkt, size);
422  if (res < 0)
423  return res;
424 
425  if (size >= st->codecpar->block_align)
426  pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
427  /* Only one stream in an AIFF file */
428  pkt->stream_index = 0;
429  pkt->duration = (res / st->codecpar->block_align) * aiff->block_duration;
430  return 0;
431 }
432 
433  const AVInputFormat ff_aiff_demuxer = {
434  .name = "aiff",
435  .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
436  .priv_data_size = sizeof(AIFFInputContext),
437  .read_probe = aiff_probe,
438  .read_header = aiff_read_header,
439  .read_packet = aiff_read_packet,
440  .read_seek = ff_pcm_read_seek,
441  .codec_tag = ff_aiff_codec_tags_list,
442 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:318
AV_CODEC_ID_MACE6
@ AV_CODEC_ID_MACE6
Definition: codec_id.h:437
AIFFInputContext::data_end
int64_t data_end
Definition: aiffdec.c:37
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:338
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:75
AV_CODEC_ID_ADPCM_IMA_QT
@ AV_CODEC_ID_ADPCM_IMA_QT
Definition: codec_id.h:357
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: options.c:237
pcm.h
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:57
MAX_SIZE
#define MAX_SIZE
Definition: aiffdec.c:387
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:53
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:389
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:1136
AV_CODEC_ID_ADPCM_G722
@ AV_CODEC_ID_ADPCM_G722
Definition: codec_id.h:385
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:392
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:65
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:300
sample_rate
sample_rate
Definition: ffmpeg_filter.c:153
AIFFInputContext
Definition: aiffdec.c:36
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
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:832
ff_get_extradata
int ff_get_extradata(void *logctx, 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: demux_utils.c:355
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:465
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: avformat.c:697
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:319
AIFF_C_VERSION1
#define AIFF_C_VERSION1
Definition: aiffdec.c:34
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:151
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:505
val
static double val(void *priv, double ch)
Definition: aeval.c:77
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:998
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:1189
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:586
AV_CODEC_ID_PCM_S8
@ AV_CODEC_ID_PCM_S8
Definition: codec_id.h:322
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:436
AVInputFormat
Definition: avformat.h:656
AV_PKT_FLAG_CORRUPT
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: packet.h:430
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:256
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:455
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
channels
channels
Definition: aptx.h:32
AV_CODEC_ID_PCM_MULAW
@ AV_CODEC_ID_PCM_MULAW
Definition: codec_id.h:324
key
const char * key
Definition: hwcontext_opencl.c:174
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:1213
AV_CODEC_ID_PCM_ALAW
@ AV_CODEC_ID_PCM_ALAW
Definition: codec_id.h:325
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:532
get_tag
static int64_t get_tag(AVIOContext *pb, uint32_t *tag)
Definition: aiffdec.c:57
NULL
#define NULL
Definition: coverity.c:32
get_aiff_header
static int get_aiff_header(AVFormatContext *s, int64_t size, unsigned version)
Definition: aiffdec.c:93
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:361
aiff.h
AIFFInputContext::block_duration
int block_duration
Definition: aiffdec.c:38
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:1158
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:453
AV_CODEC_ID_QDM2
@ AV_CODEC_ID_QDM2
Definition: codec_id.h:446
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:212
exp
int8_t exp
Definition: eval.c:72
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:177
AV_CODEC_ID_ADPCM_XA
@ AV_CODEC_ID_ADPCM_XA
Definition: codec_id.h:365
AV_CODEC_ID_GSM
@ AV_CODEC_ID_GSM
as in Berlin toast format
Definition: codec_id.h:445
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:1000
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:451
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
AVIOContext
Bytestream IO Context.
Definition: avio.h:162
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:144
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:263
ff_aiff_demuxer
const AVInputFormat ff_aiff_demuxer
Definition: aiffdec.c:433
bps
unsigned bps
Definition: movenc.c:1647
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:477
aiff_codec_get_id
static enum AVCodecID aiff_codec_get_id(int bps)
Definition: aiffdec.c:41
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:380
version
version
Definition: libkvazaar.c:313
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
AIFF
#define AIFF
Definition: aiffdec.c:33
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:184
AV_CODEC_ID_PCM_F64BE
@ AV_CODEC_ID_PCM_F64BE
Definition: codec_id.h:340
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AV_CODEC_ID_PCM_S32BE
@ AV_CODEC_ID_PCM_S32BE
Definition: codec_id.h:327
demux.h
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:129
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:102
get_meta
static void get_meta(AVFormatContext *s, const char *key, int64_t size)
Definition: aiffdec.c:71
mov_chan.h
tag
uint32_t tag
Definition: movenc.c:1646
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:948
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:392
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:41
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:641
AVPacket::stream_index
int stream_index
Definition: packet.h:376
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:103
AV_CODEC_ID_SDX2_DPCM
@ AV_CODEC_ID_SDX2_DPCM
Definition: codec_id.h:422
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:61
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:351
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:1142
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:90
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
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:988
AV_CODEC_ID_PCM_S24BE
@ AV_CODEC_ID_PCM_S24BE
Definition: codec_id.h:331
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:354
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:500
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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