FFmpeg
au.c
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1 /*
2  * AU muxer and demuxer
3  * Copyright (c) 2001 Fabrice Bellard
4  *
5  * first version by Francois Revol <revol@free.fr>
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 /*
25  * Reference documents:
26  * http://www.opengroup.org/public/pubs/external/auformat.html
27  * http://www.goice.co.jp/member/mo/formats/au.html
28  */
29 
30 #include "config_components.h"
31 
32 #include "libavutil/bprint.h"
33 #include "avformat.h"
34 #include "internal.h"
35 #include "avio_internal.h"
36 #include "pcm.h"
37 #include "libavutil/avassert.h"
38 
39 /* if we don't know the size in advance */
40 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
41 
42 static const AVCodecTag codec_au_tags[] = {
43  { AV_CODEC_ID_PCM_MULAW, 1 },
44  { AV_CODEC_ID_PCM_S8, 2 },
45  { AV_CODEC_ID_PCM_S16BE, 3 },
46  { AV_CODEC_ID_PCM_S24BE, 4 },
47  { AV_CODEC_ID_PCM_S32BE, 5 },
48  { AV_CODEC_ID_PCM_F32BE, 6 },
49  { AV_CODEC_ID_PCM_F64BE, 7 },
54  { AV_CODEC_ID_PCM_ALAW, 27 },
55  { AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') },
56  { AV_CODEC_ID_NONE, 0 },
57 };
58 
59 static const AVCodecTag *const au_codec_tags[] = { codec_au_tags, NULL };
60 
61 #if CONFIG_AU_DEMUXER
62 
63 static int au_probe(const AVProbeData *p)
64 {
65  if (p->buf[0] == '.' && p->buf[1] == 's' &&
66  p->buf[2] == 'n' && p->buf[3] == 'd')
67  return AVPROBE_SCORE_MAX;
68  else
69  return 0;
70 }
71 
72 static int au_read_annotation(AVFormatContext *s, int size)
73 {
74  static const char keys[][7] = {
75  "title",
76  "artist",
77  "album",
78  "track",
79  "genre",
80  };
81  AVIOContext *pb = s->pb;
82  enum { PARSE_KEY, PARSE_VALUE, PARSE_FINISHED } state = PARSE_KEY;
83  char c;
84  AVBPrint bprint;
85  char * key = NULL;
86  char * value = NULL;
87  int ret, i;
88 
90 
91  while (size-- > 0) {
92  if (avio_feof(pb)) {
93  av_bprint_finalize(&bprint, NULL);
94  av_freep(&key);
95  return AVERROR_EOF;
96  }
97  c = avio_r8(pb);
98  switch(state) {
99  case PARSE_KEY:
100  if (c == '\0') {
101  state = PARSE_FINISHED;
102  } else if (c == '=') {
103  ret = av_bprint_finalize(&bprint, &key);
104  if (ret < 0)
105  return ret;
107  state = PARSE_VALUE;
108  } else {
109  av_bprint_chars(&bprint, c, 1);
110  }
111  break;
112  case PARSE_VALUE:
113  if (c == '\0' || c == '\n') {
114  if (av_bprint_finalize(&bprint, &value) != 0) {
115  av_log(s, AV_LOG_ERROR, "Memory error while parsing AU metadata.\n");
116  } else {
118  for (i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
119  if (av_strcasecmp(keys[i], key) == 0) {
120  av_dict_set(&(s->metadata), keys[i], value, AV_DICT_DONT_STRDUP_VAL);
121  value = NULL;
122  break;
123  }
124  }
125  }
126  av_freep(&key);
127  av_freep(&value);
128  state = (c == '\0') ? PARSE_FINISHED : PARSE_KEY;
129  } else {
130  av_bprint_chars(&bprint, c, 1);
131  }
132  break;
133  case PARSE_FINISHED:
134  break;
135  default:
136  /* should never happen */
137  av_assert0(0);
138  }
139  }
140  av_bprint_finalize(&bprint, NULL);
141  av_freep(&key);
142  return 0;
143 }
144 
145 #define BLOCK_SIZE 1024
146 
147 static int au_read_header(AVFormatContext *s)
148 {
149  int size, data_size = 0;
150  unsigned int tag;
151  AVIOContext *pb = s->pb;
152  unsigned int id, channels, rate;
153  int bps, ba = 0;
154  enum AVCodecID codec;
155  AVStream *st;
156  int ret;
157 
158  tag = avio_rl32(pb);
159  if (tag != MKTAG('.', 's', 'n', 'd'))
160  return AVERROR_INVALIDDATA;
161  size = avio_rb32(pb); /* header size */
162  data_size = avio_rb32(pb); /* data size in bytes */
163 
164  if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
165  av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
166  return AVERROR_INVALIDDATA;
167  }
168 
169  id = avio_rb32(pb);
170  rate = avio_rb32(pb);
171  channels = avio_rb32(pb);
172 
173  if (size > 24) {
174  /* parse annotation field to get metadata */
175  ret = au_read_annotation(s, size - 24);
176  if (ret < 0)
177  return ret;
178  }
179 
180  codec = ff_codec_get_id(codec_au_tags, id);
181 
182  if (codec == AV_CODEC_ID_NONE) {
183  avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
184  return AVERROR_PATCHWELCOME;
185  }
186 
187  bps = av_get_bits_per_sample(codec);
188  if (codec == AV_CODEC_ID_ADPCM_G726LE) {
189  if (id == MKBETAG('7','2','6','2')) {
190  bps = 2;
191  } else {
192  const uint8_t bpcss[] = {4, 0, 3, 5};
193  av_assert0(id >= 23 && id < 23 + 4);
194  ba = bpcss[id - 23];
195  bps = bpcss[id - 23];
196  }
197  } else if (!bps) {
198  avpriv_request_sample(s, "Unknown bits per sample");
199  return AVERROR_PATCHWELCOME;
200  }
201 
202  if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
203  av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
204  return AVERROR_INVALIDDATA;
205  }
206 
207  if (rate == 0 || rate > INT_MAX) {
208  av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
209  return AVERROR_INVALIDDATA;
210  }
211 
212  st = avformat_new_stream(s, NULL);
213  if (!st)
214  return AVERROR(ENOMEM);
216  st->codecpar->codec_tag = id;
217  st->codecpar->codec_id = codec;
219  st->codecpar->sample_rate = rate;
221  st->codecpar->bit_rate = channels * rate * bps;
222  st->codecpar->block_align = ba ? ba : FFMAX(bps * channels / 8, 1);
223  if (data_size != AU_UNKNOWN_SIZE)
224  st->duration = (((int64_t)data_size)<<3) / (channels * (int64_t)bps);
225 
226  st->start_time = 0;
227  avpriv_set_pts_info(st, 64, 1, rate);
228 
229  return 0;
230 }
231 
233  .name = "au",
234  .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
235  .read_probe = au_probe,
236  .read_header = au_read_header,
237  .read_packet = ff_pcm_read_packet,
238  .read_seek = ff_pcm_read_seek,
239  .codec_tag = au_codec_tags,
240 };
241 
242 #endif /* CONFIG_AU_DEMUXER */
243 
244 #if CONFIG_AU_MUXER
245 
246 typedef struct AUContext {
247  uint32_t header_size;
248 } AUContext;
249 
250 #include "rawenc.h"
251 
252 static int au_get_annotations(AVFormatContext *s, AVBPrint *annotations)
253 {
254  static const char keys[][7] = {
255  "Title",
256  "Artist",
257  "Album",
258  "Track",
259  "Genre",
260  };
261  int cnt = 0;
262  AVDictionary *m = s->metadata;
263  AVDictionaryEntry *t = NULL;
264 
265  for (int i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
266  t = av_dict_get(m, keys[i], NULL, 0);
267  if (t != NULL) {
268  if (cnt++)
269  av_bprint_chars(annotations, '\n', 1);
270  av_bprintf(annotations, "%s=%s", keys[i], t->value);
271  }
272  }
273  /* The specification requires the annotation field to be zero-terminated
274  * and its length to be a multiple of eight, so pad with 0's */
275  av_bprint_chars(annotations, '\0', 8);
276  return av_bprint_is_complete(annotations) ? 0 : AVERROR(ENOMEM);
277 }
278 
279 static int au_write_header(AVFormatContext *s)
280 {
281  int ret;
282  AUContext *au = s->priv_data;
283  AVIOContext *pb = s->pb;
284  AVCodecParameters *par = s->streams[0]->codecpar;
285  AVBPrint annotations;
286 
287  if (s->nb_streams != 1) {
288  av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
289  return AVERROR(EINVAL);
290  }
291 
293  if (!par->codec_tag) {
294  av_log(s, AV_LOG_ERROR, "unsupported codec\n");
295  return AVERROR(EINVAL);
296  }
297 
298  av_bprint_init(&annotations, 0, INT_MAX - 24);
299  ret = au_get_annotations(s, &annotations);
300  if (ret < 0)
301  goto fail;
302  au->header_size = 24 + annotations.len & ~7;
303 
304  ffio_wfourcc(pb, ".snd"); /* magic number */
305  avio_wb32(pb, au->header_size); /* header size */
306  avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
307  avio_wb32(pb, par->codec_tag); /* codec ID */
308  avio_wb32(pb, par->sample_rate);
309  avio_wb32(pb, par->ch_layout.nb_channels);
310  avio_write(pb, annotations.str, annotations.len & ~7);
311 
312 fail:
313  av_bprint_finalize(&annotations, NULL);
314 
315  return ret;
316 }
317 
318 static int au_write_trailer(AVFormatContext *s)
319 {
320  AVIOContext *pb = s->pb;
321  AUContext *au = s->priv_data;
322  int64_t file_size = avio_tell(pb);
323 
324  if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && file_size < INT32_MAX) {
325  /* update file size */
326  avio_seek(pb, 8, SEEK_SET);
327  avio_wb32(pb, (uint32_t)(file_size - au->header_size));
328  avio_seek(pb, file_size, SEEK_SET);
329  }
330 
331  return 0;
332 }
333 
334 const AVOutputFormat ff_au_muxer = {
335  .name = "au",
336  .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
337  .mime_type = "audio/basic",
338  .extensions = "au",
339  .priv_data_size = sizeof(AUContext),
340  .audio_codec = AV_CODEC_ID_PCM_S16BE,
341  .video_codec = AV_CODEC_ID_NONE,
342  .write_header = au_write_header,
344  .write_trailer = au_write_trailer,
345  .codec_tag = au_codec_tags,
347 };
348 
349 #endif /* CONFIG_AU_MUXER */
AV_BPRINT_SIZE_UNLIMITED
#define AV_BPRINT_SIZE_UNLIMITED
AV_CODEC_ID_PCM_F32BE
@ AV_CODEC_ID_PCM_F32BE
Definition: codec_id.h:340
codec_au_tags
static const AVCodecTag codec_au_tags[]
Definition: au.c:42
ff_au_demuxer
const AVInputFormat ff_au_demuxer
AVOutputFormat::name
const char * name
Definition: avformat.h:510
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
ffio_wfourcc
static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
Definition: avio_internal.h:116
av_bprint_finalize
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
av_bprint_init
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:53
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:481
av_strcasecmp
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
Definition: avstring.c:218
AV_CODEC_ID_ADPCM_G722
@ AV_CODEC_ID_ADPCM_G722
Definition: codec_id.h:387
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:65
AVDictionary
Definition: dict.c:30
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:300
au_codec_tags
static const AVCodecTag *const au_codec_tags[]
Definition: au.c:59
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:763
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:321
fail
#define fail()
Definition: checkasm.h:131
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:505
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:998
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:324
avassert.h
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:790
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVInputFormat
Definition: avformat.h:656
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
AVCodecTag
Definition: internal.h:50
av_dict_get
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:40
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
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
channels
channels
Definition: aptx.h:32
ff_raw_write_packet
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:31
AV_CODEC_ID_PCM_MULAW
@ AV_CODEC_ID_PCM_MULAW
Definition: codec_id.h:326
key
const char * key
Definition: hwcontext_opencl.c:174
AVFormatContext
Format I/O context.
Definition: avformat.h:1213
AV_CODEC_ID_PCM_ALAW
@ AV_CODEC_ID_PCM_ALAW
Definition: codec_id.h:327
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
state
static struct @334 state
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:100
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:453
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:212
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:177
av_bprint_is_complete
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:185
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:47
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
id
enum AVCodecID id
Definition: extract_extradata_bsf.c:324
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:144
bps
unsigned bps
Definition: movenc.c:1647
size
int size
Definition: twinvq_data.h:10344
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: macros.h:56
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:232
avio_wb32
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:394
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:632
rawenc.h
bprint.h
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
AVOutputFormat
Definition: avformat.h:509
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
avio_internal.h
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:342
value
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 default value
Definition: writing_filters.txt:86
AV_CODEC_ID_PCM_S32BE
@ AV_CODEC_ID_PCM_S32BE
Definition: codec_id.h:329
ff_pcm_read_packet
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
tag
uint32_t tag
Definition: movenc.c:1646
ret
ret
Definition: filter_design.txt:187
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
avformat.h
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
AV_CODEC_ID_ADPCM_G726LE
@ AV_CODEC_ID_ADPCM_G726LE
Definition: codec_id.h:394
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:41
ff_codec_get_tag
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:134
AU_UNKNOWN_SIZE
#define AU_UNKNOWN_SIZE
Definition: au.c:40
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:103
ff_au_muxer
const AVOutputFormat ff_au_muxer
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVDictionaryEntry
Definition: dict.h:79
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:61
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
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
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
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
BLOCK_SIZE
#define BLOCK_SIZE
Definition: adx.h:53
AVDictionaryEntry::value
char * value
Definition: dict.h:81
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
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:346
write_packet
static int write_packet(OutputFile *of, OutputStream *ost, AVPacket *pkt)
Definition: ffmpeg_mux.c:90
AV_CODEC_ID_PCM_S24BE
@ AV_CODEC_ID_PCM_S24BE
Definition: codec_id.h:333
av_bprint_chars
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:375