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 "libavutil/mem.h"
25 #include "avformat.h"
26 #include "demux.h"
27 #include "internal.h"
28 #include "pcm.h"
29 #include "aiff.h"
30 #include "id3v2.h"
31 #include "mov_chan.h"
32 #include "replaygain.h"
33 
34 #define AIFF 0
35 #define AIFF_C_VERSION1 0xA2805140
36 
37 typedef struct AIFFInputContext {
38  int64_t data_end;
39  int block_duration;
40 } AIFFInputContext;
41 
42 static enum AVCodecID aiff_codec_get_id(int bps)
43 {
44  if (bps <= 8)
45  return AV_CODEC_ID_PCM_S8;
46  if (bps <= 16)
47  return AV_CODEC_ID_PCM_S16BE;
48  if (bps <= 24)
49  return AV_CODEC_ID_PCM_S24BE;
50  if (bps <= 32)
51  return AV_CODEC_ID_PCM_S32BE;
52 
53  /* bigger than 32 isn't allowed */
54  return AV_CODEC_ID_NONE;
55 }
56 
57 /* returns the size of the found tag */
58 static int64_t get_tag(AVIOContext *pb, uint32_t * tag)
59 {
60  int64_t size;
61 
62  if (avio_feof(pb))
63  return AVERROR(EIO);
64 
65  *tag = avio_rl32(pb);
66  size = avio_rb32(pb);
67 
68  return size;
69 }
70 
71 /* Metadata string read */
72 static void get_meta(AVFormatContext *s, const char *key, int64_t size)
73 {
74  uint8_t *str = NULL;
75 
76  if (size < SIZE_MAX)
77  str = av_malloc(size+1);
78 
79  if (str) {
80  int res = avio_read(s->pb, str, size);
81  if (res < 0){
82  av_free(str);
83  return;
84  }
85  size -= res;
86  str[res] = 0;
87  av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
88  }
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, int64_t size,
95  unsigned version)
96 {
97  AVIOContext *pb = s->pb;
98  AVCodecParameters *par = s->streams[0]->codecpar;
99  AIFFInputContext *aiff = s->priv_data;
100  int exp;
101  uint64_t val;
102  int sample_rate;
103  unsigned int num_frames;
104  int channels;
105 
106  if (size & 1)
107  size++;
108  par->codec_type = AVMEDIA_TYPE_AUDIO;
109  channels = avio_rb16(pb);
110  if (par->ch_layout.nb_channels && par->ch_layout.nb_channels != channels)
111  return AVERROR_INVALIDDATA;
112  par->ch_layout.nb_channels = channels;
113  num_frames = avio_rb32(pb);
114  par->bits_per_coded_sample = avio_rb16(pb);
115 
116  exp = avio_rb16(pb) - 16383 - 63;
117  val = avio_rb64(pb);
118  if (exp <-63 || exp >63) {
119  av_log(s, AV_LOG_ERROR, "exp %d is out of range\n", exp);
120  return AVERROR_INVALIDDATA;
121  }
122  if (exp >= 0)
123  sample_rate = val << exp;
124  else
125  sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
126  if (sample_rate <= 0)
127  return AVERROR_INVALIDDATA;
128 
129  par->sample_rate = sample_rate;
130  if (size < 18)
131  return AVERROR_INVALIDDATA;
132  size -= 18;
133 
134  /* get codec id for AIFF-C */
135  if (size < 4) {
136  version = AIFF;
137  } else if (version == AIFF_C_VERSION1) {
138  par->codec_tag = avio_rl32(pb);
139  par->codec_id = ff_codec_get_id(ff_codec_aiff_tags, par->codec_tag);
140  if (par->codec_id == AV_CODEC_ID_NONE)
141  avpriv_request_sample(s, "unknown or unsupported codec tag: %s",
142  av_fourcc2str(par->codec_tag));
143  size -= 4;
144  }
145 
146  if (version != AIFF_C_VERSION1 || par->codec_id == AV_CODEC_ID_PCM_S16BE) {
147  par->codec_id = aiff_codec_get_id(par->bits_per_coded_sample);
148  par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);
149  aiff->block_duration = 1;
150  } else {
151  switch (par->codec_id) {
152  case AV_CODEC_ID_PCM_F32BE:
153  case AV_CODEC_ID_PCM_F64BE:
154  case AV_CODEC_ID_PCM_S16LE:
155  case AV_CODEC_ID_PCM_ALAW:
156  case AV_CODEC_ID_PCM_MULAW:
157  aiff->block_duration = 1;
158  break;
159  case AV_CODEC_ID_ADPCM_IMA_QT:
160  par->block_align = 34 * channels;
161  break;
162  case AV_CODEC_ID_MACE3:
163  par->block_align = 2 * channels;
164  break;
165  case AV_CODEC_ID_ADPCM_G726LE:
166  par->bits_per_coded_sample = 5;
167  case AV_CODEC_ID_ADPCM_IMA_WS:
168  case AV_CODEC_ID_ADPCM_G722:
169  case AV_CODEC_ID_MACE6:
170  case AV_CODEC_ID_CBD2_DPCM:
171  case AV_CODEC_ID_SDX2_DPCM:
172  par->block_align = 1 * channels;
173  break;
174  case AV_CODEC_ID_GSM:
175  par->block_align = 33;
176  break;
177  default:
178  aiff->block_duration = 1;
179  break;
180  }
181  if (par->block_align > 0)
182  aiff->block_duration = av_get_audio_frame_duration2(par,
183  par->block_align);
184  }
185 
186  /* Block align needs to be computed in all cases, as the definition
187  * is specific to applications -> here we use the WAVE format definition */
188  if (!par->block_align)
189  par->block_align = (av_get_bits_per_sample(par->codec_id) * channels) >> 3;
190 
191  if (aiff->block_duration) {
192  par->bit_rate = av_rescale(par->sample_rate, par->block_align * 8LL,
193  aiff->block_duration);
194  if (par->bit_rate < 0)
195  par->bit_rate = 0;
196  }
197 
198  /* Chunk is over */
199  if (size)
200  avio_skip(pb, size);
201 
202  return num_frames;
203 }
204 
205 static int aiff_probe(const AVProbeData *p)
206 {
207  /* check file header */
208  if (AV_RL32(p->buf) == MKTAG('F', 'O', 'R', 'M') &&
209  AV_RB32(p->buf + 4) >= 4 &&
210  p->buf[8] == 'A' && p->buf[9] == 'I' &&
211  p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
212  return AVPROBE_SCORE_MAX;
213  else
214  return 0;
215 }
216 
217 /* aiff input */
218 static int aiff_read_header(AVFormatContext *s)
219 {
220  int ret;
221  int64_t filesize, size;
222  int64_t offset = 0, position;
223  uint32_t tag;
224  unsigned version = AIFF_C_VERSION1;
225  AVIOContext *pb = s->pb;
226  AVStream * st;
227  AIFFInputContext *aiff = s->priv_data;
228  ID3v2ExtraMeta *id3v2_extra_meta;
229 
230  /* check FORM header */
231  filesize = get_tag(pb, &tag);
232  if (filesize < 4 || tag != MKTAG('F', 'O', 'R', 'M'))
233  return AVERROR_INVALIDDATA;
234 
235  /* AIFF data type */
236  tag = avio_rl32(pb);
237  if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
238  version = AIFF;
239  else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
240  return AVERROR_INVALIDDATA;
241 
242  filesize -= 4;
243 
244  st = avformat_new_stream(s, NULL);
245  if (!st)
246  return AVERROR(ENOMEM);
247 
248  while (filesize > 0) {
249  /* parse different chunks */
250  size = get_tag(pb, &tag);
251 
252  if (size == AVERROR_EOF && offset > 0 && st->codecpar->block_align) {
253  av_log(s, AV_LOG_WARNING, "header parser hit EOF\n");
254  goto got_sound;
255  }
256  if (size < 0)
257  return size;
258 
259  filesize -= size + 8;
260 
261  switch (tag) {
262  case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
263  /* Then for the complete header info */
264  st->nb_frames = get_aiff_header(s, size, version);
265  if (st->nb_frames < 0)
266  return st->nb_frames;
267  if (offset > 0) // COMM is after SSND
268  goto got_sound;
269  break;
270  case MKTAG('I', 'D', '3', ' '):
271  position = avio_tell(pb);
272  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
273  if (id3v2_extra_meta)
274  if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0 ||
275  (ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0) {
276  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
277  return ret;
278  }
279  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
280  if (position + size > avio_tell(pb))
281  avio_skip(pb, position + size - avio_tell(pb));
282  break;
283  case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
284  version = avio_rb32(pb);
285  break;
286  case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
287  get_meta(s, "title" , size);
288  break;
289  case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
290  get_meta(s, "author" , size);
291  break;
292  case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
293  get_meta(s, "copyright", size);
294  break;
295  case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
296  get_meta(s, "comment" , size);
297  break;
298  case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
299  if (size < 8)
300  return AVERROR_INVALIDDATA;
301  aiff->data_end = avio_tell(pb) + size;
302  offset = avio_rb32(pb); /* Offset of sound data */
303  avio_rb32(pb); /* BlockSize... don't care */
304  offset += avio_tell(pb); /* Compute absolute data offset */
305  if (st->codecpar->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) /* Assume COMM already parsed */
306  goto got_sound;
307  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
308  av_log(s, AV_LOG_ERROR, "file is not seekable\n");
309  return -1;
310  }
311  avio_skip(pb, size - 8);
312  break;
313  case MKTAG('w', 'a', 'v', 'e'):
314  if ((uint64_t)size > (1<<30))
315  return AVERROR_INVALIDDATA;
316  if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
317  return ret;
318  if ( (st->codecpar->codec_id == AV_CODEC_ID_QDMC || st->codecpar->codec_id == AV_CODEC_ID_QDM2)
319  && size>=12*4 && !st->codecpar->block_align) {
320  st->codecpar->block_align = AV_RB32(st->codecpar->extradata+11*4);
321  aiff->block_duration = AV_RB32(st->codecpar->extradata+9*4);
322  } else if (st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
323  char rate = 0;
324  if (size >= 25)
325  rate = st->codecpar->extradata[24];
326  switch (rate) {
327  case 'H': // RATE_HALF
328  st->codecpar->block_align = 17;
329  break;
330  case 'F': // RATE_FULL
331  default:
332  st->codecpar->block_align = 35;
333  }
334  aiff->block_duration = 160;
335  st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate * (st->codecpar->block_align << 3) /
336  aiff->block_duration;
337  }
338  break;
339  case MKTAG('C','H','A','N'):
340  if ((ret = ff_mov_read_chan(s, pb, st, size)) < 0)
341  return ret;
342  break;
343  case MKTAG('A','P','C','M'): /* XA ADPCM compressed sound chunk */
344  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_XA;
345  aiff->data_end = avio_tell(pb) + size;
346  offset = avio_tell(pb) + 8;
347  /* This field is unknown and its data seems to be irrelevant */
348  avio_rb32(pb);
349  st->codecpar->block_align = avio_rb32(pb);
350 
351  goto got_sound;
352  break;
353  case 0:
354  if (offset > 0 && st->codecpar->block_align) // COMM && SSND
355  goto got_sound;
356  default: /* Jump */
357  avio_skip(pb, size);
358  }
359 
360  /* Skip required padding byte for odd-sized chunks. */
361  if (size & 1) {
362  filesize--;
363  avio_skip(pb, 1);
364  }
365  }
366 
367  ret = ff_replaygain_export(st, s->metadata);
368  if (ret < 0)
369  return ret;
370 
371 got_sound:
372  if (!st->codecpar->block_align && st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
373  av_log(s, AV_LOG_WARNING, "qcelp without wave chunk, assuming full rate\n");
374  st->codecpar->block_align = 35;
375  } else if (st->codecpar->block_align <= 0) {
376  av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
377  return AVERROR_INVALIDDATA;
378  }
379  if (aiff->block_duration < 0)
380  return AVERROR_INVALIDDATA;
381 
382  /* Now positioned, get the sound data start and end */
383  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
384  st->start_time = 0;
385  st->duration = st->nb_frames * aiff->block_duration;
386 
387  /* Position the stream at the first block */
388  avio_seek(pb, offset, SEEK_SET);
389 
390  return 0;
391 }
392 
393 #define MAX_SIZE 4096
394 
395 static int aiff_read_packet(AVFormatContext *s,
396  AVPacket *pkt)
397 {
398  AVStream *st = s->streams[0];
399  AIFFInputContext *aiff = s->priv_data;
400  int64_t max_size;
401  int res, size;
402 
403  /* calculate size of remaining data */
404  max_size = aiff->data_end - avio_tell(s->pb);
405  if (max_size <= 0)
406  return AVERROR_EOF;
407 
408  if (!st->codecpar->block_align) {
409  av_log(s, AV_LOG_ERROR, "block_align not set\n");
410  return AVERROR_INVALIDDATA;
411  }
412 
413  /* Now for that packet */
414  switch (st->codecpar->codec_id) {
415  case AV_CODEC_ID_ADPCM_IMA_QT:
416  case AV_CODEC_ID_GSM:
417  case AV_CODEC_ID_QDM2:
418  case AV_CODEC_ID_QCELP:
419  size = st->codecpar->block_align;
420  break;
421  default:
422  size = st->codecpar->block_align ? (MAX_SIZE / st->codecpar->block_align) * st->codecpar->block_align : MAX_SIZE;
423  if (!size)
424  return AVERROR_INVALIDDATA;
425  }
426  size = FFMIN(max_size, size);
427  res = av_get_packet(s->pb, pkt, size);
428  if (res < 0)
429  return res;
430 
431  if (size >= st->codecpar->block_align)
432  pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
433  /* Only one stream in an AIFF file */
434  pkt->stream_index = 0;
435  pkt->duration = (res / st->codecpar->block_align) * (int64_t) aiff->block_duration;
436  return 0;
437 }
438 
439 const FFInputFormat ff_aiff_demuxer = {
440  .p.name = "aiff",
441  .p.long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
442  .p.codec_tag = ff_aiff_codec_tags_list,
443  .priv_data_size = sizeof(AIFFInputContext),
444  .read_probe = aiff_probe,
445  .read_header = aiff_read_header,
446  .read_packet = aiff_read_packet,
447  .read_seek = ff_pcm_read_seek,
448 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:328
AV_CODEC_ID_MACE6
@ AV_CODEC_ID_MACE6
Definition: codec_id.h:450
AIFFInputContext::data_end
int64_t data_end
Definition: aiffdec.c:38
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:348
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:69
AV_CODEC_ID_ADPCM_IMA_QT
@ AV_CODEC_ID_ADPCM_IMA_QT
Definition: codec_id.h:367
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
pcm.h
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
MAX_SIZE
#define MAX_SIZE
Definition: aiffdec.c:393
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
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:94
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:395
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:1140
AV_CODEC_ID_ADPCM_G722
@ AV_CODEC_ID_ADPCM_G722
Definition: codec_id.h:395
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:542
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:59
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:313
sample_rate
sample_rate
Definition: ffmpeg_filter.c:424
AIFFInputContext
Definition: aiffdec.c:37
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
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:335
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:463
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:853
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:329
AIFF_C_VERSION1
#define AIFF_C_VERSION1
Definition: aiffdec.c:35
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:494
val
static double val(void *priv, double ch)
Definition: aeval.c:78
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:802
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:1193
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:79
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:547
AV_CODEC_ID_PCM_S8
@ AV_CODEC_ID_PCM_S8
Definition: codec_id.h:332
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:761
pkt
AVPacket * pkt
Definition: movenc.c:60
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:449
AV_PKT_FLAG_CORRUPT
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: packet.h:580
ID3v2ExtraMeta
Definition: id3v2.h:84
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_read_callback.c:42
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:198
ff_aiff_demuxer
const FFInputFormat ff_aiff_demuxer
Definition: aiffdec.c:439
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:553
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:453
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
channels
channels
Definition: aptx.h:31
AV_CODEC_ID_PCM_MULAW
@ AV_CODEC_ID_PCM_MULAW
Definition: codec_id.h:334
key
const char * key
Definition: hwcontext_opencl.c:189
aiff_probe
static int aiff_probe(const AVProbeData *p)
Definition: aiffdec.c:205
if
if(ret)
Definition: filter_design.txt:179
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
AV_CODEC_ID_PCM_ALAW
@ AV_CODEC_ID_PCM_ALAW
Definition: codec_id.h:335
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:766
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:550
get_tag
static int64_t get_tag(AVIOContext *pb, uint32_t *tag)
Definition: aiffdec.c:58
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:94
AV_CODEC_ID_ADPCM_IMA_WS
@ AV_CODEC_ID_ADPCM_IMA_WS
Definition: codec_id.h:371
aiff.h
AIFFInputContext::block_duration
int block_duration
Definition: aiffdec.c:39
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:1162
avio_rb64
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:908
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
AV_CODEC_ID_QDM2
@ AV_CODEC_ID_QDM2
Definition: codec_id.h:459
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:180
exp
int8_t exp
Definition: eval.c:73
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:184
AV_CODEC_ID_ADPCM_XA
@ AV_CODEC_ID_ADPCM_XA
Definition: codec_id.h:375
AV_CODEC_ID_GSM
@ AV_CODEC_ID_GSM
as in Berlin toast format
Definition: codec_id.h:458
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:804
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:49
AV_CODEC_ID_QCELP
@ AV_CODEC_ID_QCELP
Definition: codec_id.h:464
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:730
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
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:94
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:146
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:261
bps
unsigned bps
Definition: movenc.c:1788
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:490
aiff_codec_get_id
static enum AVCodecID aiff_codec_get_id(int bps)
Definition: aiffdec.c:42
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
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:796
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:41
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:530
version
version
Definition: libkvazaar.c:321
filesize
static int64_t filesize(AVIOContext *pb)
Definition: ffmpeg_mux.c:51
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:50
AIFF
#define AIFF
Definition: aiffdec.c:34
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:191
AV_CODEC_ID_PCM_F64BE
@ AV_CODEC_ID_PCM_F64BE
Definition: codec_id.h:350
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AV_CODEC_ID_PCM_S32BE
@ AV_CODEC_ID_PCM_S32BE
Definition: codec_id.h:337
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:104
get_meta
static void get_meta(AVFormatContext *s, const char *key, int64_t size)
Definition: aiffdec.c:72
mov_chan.h
tag
uint32_t tag
Definition: movenc.c:1787
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:743
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:231
ff_pcm_read_seek
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:73
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:746
avformat.h
dict.h
AV_CODEC_ID_CBD2_DPCM
@ AV_CODEC_ID_CBD2_DPCM
Definition: codec_id.h:437
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AV_CODEC_ID_ADPCM_G726LE
@ AV_CODEC_ID_ADPCM_G726LE
Definition: codec_id.h:402
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:612
AVPacket::stream_index
int stream_index
Definition: packet.h:526
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:318
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:30
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:110
mem.h
AV_CODEC_ID_SDX2_DPCM
@ AV_CODEC_ID_SDX2_DPCM
Definition: codec_id.h:433
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:55
ff_aiff_codec_tags_list
const AVCodecTag *const ff_aiff_codec_tags_list[]
Definition: aiff.c:55
AVPacket
This structure stores compressed data.
Definition: packet.h:501
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:88
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:1146
FFInputFormat
Definition: demux.h:37
replaygain.h
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:97
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:792
AV_CODEC_ID_PCM_S24BE
@ AV_CODEC_ID_PCM_S24BE
Definition: codec_id.h:341
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:345
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:526
aiff_read_header
static int aiff_read_header(AVFormatContext *s)
Definition: aiffdec.c:218
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:346
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