FFmpeg  4.3.8
flacenc.c
Go to the documentation of this file.
1 /*
2  * raw FLAC muxer
3  * Copyright (c) 2006-2009 Justin Ruggles
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 
23 #include "libavutil/opt.h"
24 #include "libavutil/pixdesc.h"
25 #include "libavcodec/flac.h"
26 #include "avformat.h"
27 #include "avio_internal.h"
28 #include "flacenc.h"
29 #include "id3v2.h"
30 #include "internal.h"
31 #include "vorbiscomment.h"
32 
33 
34 typedef struct FlacMuxerContext {
35  const AVClass *class;
37 
40  /* audio packets are queued here until we get all the attached pictures */
42 
43  /* updated streaminfo sent by the encoder at the end */
46 
47  unsigned attached_types;
49 
50 static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes,
51  int last_block)
52 {
53  avio_w8(pb, last_block ? 0x81 : 0x01);
54  avio_wb24(pb, n_padding_bytes);
55  ffio_fill(pb, 0, n_padding_bytes);
56  return 0;
57 }
58 
60  int last_block, int bitexact)
61 {
62  const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
63  int64_t len;
64 
66 
67  len = ff_vorbiscomment_length(*m, vendor, NULL, 0);
68  if (len >= ((1<<24) - 4))
69  return AVERROR(EINVAL);
70 
71  avio_w8(pb, last_block ? 0x84 : 0x04);
72  avio_wb24(pb, len);
73  ff_vorbiscomment_write(pb, *m, vendor, NULL, 0);
74 
75  return 0;
76 }
77 
79 {
81  AVIOContext *pb = s->pb;
82  const AVPixFmtDescriptor *pixdesc;
83  const CodecMime *mime = ff_id3v2_mime_tags;
85  const char *mimetype = NULL, *desc = "";
86  const AVStream *st = s->streams[pkt->stream_index];
87  int i, mimelen, desclen, type = 0, blocklen;
88 
89  if (!pkt->data)
90  return 0;
91 
92  while (mime->id != AV_CODEC_ID_NONE) {
93  if (mime->id == st->codecpar->codec_id) {
94  mimetype = mime->str;
95  break;
96  }
97  mime++;
98  }
99  if (!mimetype) {
100  av_log(s, AV_LOG_ERROR, "No mimetype is known for stream %d, cannot "
101  "write an attached picture.\n", st->index);
102  return AVERROR(EINVAL);
103  }
104  mimelen = strlen(mimetype);
105 
106  /* get the picture type */
107  e = av_dict_get(st->metadata, "comment", NULL, 0);
108  for (i = 0; e && i < FF_ARRAY_ELEMS(ff_id3v2_picture_types); i++) {
110  type = i;
111  break;
112  }
113  }
114 
115  if ((c->attached_types & (1 << type)) & 0x6) {
116  av_log(s, AV_LOG_ERROR, "Duplicate attachment for type '%s'\n", ff_id3v2_picture_types[type]);
117  return AVERROR(EINVAL);
118  }
119 
120  if (type == 1 && (st->codecpar->codec_id != AV_CODEC_ID_PNG ||
121  st->codecpar->width != 32 ||
122  st->codecpar->height != 32)) {
123  av_log(s, AV_LOG_ERROR, "File icon attachment must be a 32x32 PNG");
124  return AVERROR(EINVAL);
125  }
126 
127  c->attached_types |= (1 << type);
128 
129  /* get the description */
130  if ((e = av_dict_get(st->metadata, "title", NULL, 0)))
131  desc = e->value;
132  desclen = strlen(desc);
133 
134  blocklen = 4 + 4 + mimelen + 4 + desclen + 4 + 4 + 4 + 4 + 4 + pkt->size;
135  if (blocklen >= 1<<24) {
136  av_log(s, AV_LOG_ERROR, "Picture block too big %d >= %d\n", blocklen, 1<<24);
137  return AVERROR(EINVAL);
138  }
139 
140  avio_w8(pb, 0x06);
141  avio_wb24(pb, blocklen);
142 
143  avio_wb32(pb, type);
144 
145  avio_wb32(pb, mimelen);
146  avio_write(pb, mimetype, mimelen);
147 
148  avio_wb32(pb, desclen);
149  avio_write(pb, desc, desclen);
150 
151  avio_wb32(pb, st->codecpar->width);
152  avio_wb32(pb, st->codecpar->height);
153  if ((pixdesc = av_pix_fmt_desc_get(st->codecpar->format)))
154  avio_wb32(pb, av_get_bits_per_pixel(pixdesc));
155  else
156  avio_wb32(pb, 0);
157  avio_wb32(pb, 0);
158 
159  avio_wb32(pb, pkt->size);
160  avio_write(pb, pkt->data, pkt->size);
161  return 0;
162 }
163 
165 {
166  int i, ret, padding = s->metadata_header_padding;
167  if (padding < 0)
168  padding = 8192;
169  /* The FLAC specification states that 24 bits are used to represent the
170  * size of a metadata block so we must clip this value to 2^24-1. */
171  padding = av_clip_uintp2(padding, 24);
172 
173  for (i = 0; i < s->nb_streams; i++) {
174  AVStream *st = s->streams[i];
175  AVPacket *pkt = st->priv_data;
176  if (!pkt)
177  continue;
178  ret = flac_write_picture(s, pkt);
179  av_packet_unref(pkt);
180  if (ret < 0 && (s->error_recognition & AV_EF_EXPLODE))
181  return ret;
182  }
183 
184  ret = flac_write_block_comment(s->pb, &s->metadata, !padding,
186  if (ret)
187  return ret;
188 
189  /* The command line flac encoder defaults to placing a seekpoint
190  * every 10s. So one might add padding to allow that later
191  * but there seems to be no simple way to get the duration here.
192  * So just add the amount requested by the user. */
193  if (padding)
194  flac_write_block_padding(s->pb, padding, 1);
195 
196  return 0;
197 }
198 
199 static int flac_init(struct AVFormatContext *s)
200 {
201  AVCodecParameters *par;
203  int i;
204 
205  c->audio_stream_idx = -1;
206  for (i = 0; i < s->nb_streams; i++) {
207  AVStream *st = s->streams[i];
208  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
209  if (c->audio_stream_idx >= 0 || st->codecpar->codec_id != AV_CODEC_ID_FLAC) {
210  av_log(s, AV_LOG_ERROR, "Invalid audio stream. Exactly one FLAC "
211  "audio stream is required.\n");
212  return AVERROR(EINVAL);
213  }
214  par = s->streams[i]->codecpar;
215  c->audio_stream_idx = i;
216  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
218  av_log(s, AV_LOG_WARNING, "Video stream #%d is not an attached picture. Ignoring\n", i);
219  continue;
220  } else if (st->codecpar->codec_id == AV_CODEC_ID_GIF) {
221  av_log(s, AV_LOG_ERROR, "GIF image support is not implemented.\n");
222  return AVERROR_PATCHWELCOME;
223  } else if (!c->write_header) {
224  av_log(s, AV_LOG_ERROR, "Can't write attached pictures without a header.\n");
225  return AVERROR(EINVAL);
226  }
227  c->waiting_pics++;
228  } else {
229  av_log(s, AV_LOG_ERROR, "Only audio streams and pictures are allowed in FLAC.\n");
230  return AVERROR(EINVAL);
231  }
232  }
233  if (c->audio_stream_idx < 0) {
234  av_log(s, AV_LOG_ERROR, "No audio stream present.\n");
235  return AVERROR(EINVAL);
236  }
237 
238  /* add the channel layout tag */
239  if (par->channel_layout &&
240  !(par->channel_layout & ~0x3ffffULL) &&
242  AVDictionaryEntry *chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK",
243  NULL, 0);
244 
245  if (chmask) {
246  av_log(s, AV_LOG_WARNING, "A WAVEFORMATEXTENSIBLE_CHANNEL_MASK is "
247  "already present, this muxer will not overwrite it.\n");
248  } else {
249  uint8_t buf[32];
250  snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
251  av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
252  }
253  }
254 
255  return 0;
256 }
257 
259 {
262  int ret;
263 
264  if (!c->write_header)
265  return 0;
266 
267  ret = ff_flac_write_header(s->pb, par->extradata,
268  par->extradata_size, 0);
269  if (ret < 0)
270  return ret;
271 
272  if (!c->waiting_pics)
273  ret = flac_finish_header(s);
274 
275  return ret;
276 }
277 
279 {
282  int streaminfo_size;
283 
284  /* check for updated streaminfo */
286  &streaminfo_size);
287  if (streaminfo && streaminfo_size == FLAC_STREAMINFO_SIZE) {
288  memcpy(c->streaminfo, streaminfo, FLAC_STREAMINFO_SIZE);
289  c->updated_streaminfo = 1;
290  }
291 
292  if (pkt->size)
293  avio_write(s->pb, pkt->data, pkt->size);
294  return 0;
295 }
296 
298 {
300  AVPacket pkt;
301  int ret, write = 1;
302 
303  ret = flac_finish_header(s);
304  if (ret < 0)
305  write = 0;
306 
307  while (c->queue) {
308  ff_packet_list_get(&c->queue, &c->queue_end, &pkt);
309  if (write && (ret = flac_write_audio_packet(s, &pkt)) < 0)
310  write = 0;
311  av_packet_unref(&pkt);
312  }
313  return ret;
314 }
315 
317 {
318  AVIOContext *pb = s->pb;
319  int64_t file_size;
321 
322  if (c->waiting_pics) {
323  av_log(s, AV_LOG_WARNING, "No packets were sent for some of the "
324  "attached pictures.\n");
325  flac_queue_flush(s);
326  }
327 
328  if (!c->write_header || !c->updated_streaminfo)
329  return 0;
330 
331  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
332  /* rewrite the STREAMINFO header block data */
333  file_size = avio_tell(pb);
334  avio_seek(pb, 8, SEEK_SET);
336  avio_seek(pb, file_size, SEEK_SET);
337  } else {
338  av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
339  }
340 
341  return 0;
342 }
343 
344 static void flac_deinit(struct AVFormatContext *s)
345 {
347 
349  for (unsigned i = 0; i < s->nb_streams; i++)
351 }
352 
354 {
356  int ret;
357 
358  if (pkt->stream_index == c->audio_stream_idx) {
359  if (c->waiting_pics) {
360  /* buffer audio packets until we get all the pictures */
362  if (ret < 0) {
363  av_log(s, AV_LOG_ERROR, "Out of memory in packet queue; skipping attached pictures\n");
364  c->waiting_pics = 0;
365  ret = flac_queue_flush(s);
366  if (ret < 0)
367  return ret;
368  return flac_write_audio_packet(s, pkt);
369  }
370  } else
371  return flac_write_audio_packet(s, pkt);
372  } else {
373  AVStream *st = s->streams[pkt->stream_index];
374 
375  if (!c->waiting_pics ||
377  return 0;
378 
379  /* warn only once for each stream */
380  if (st->nb_frames == 1) {
381  av_log(s, AV_LOG_WARNING, "Got more than one picture in stream %d,"
382  " ignoring.\n", pkt->stream_index);
383  }
384  if (st->nb_frames >= 1)
385  return 0;
386 
387  st->priv_data = av_packet_clone(pkt);
388  if (!st->priv_data)
389  av_log(s, AV_LOG_ERROR, "Out of memory queueing an attached picture; skipping\n");
390  c->waiting_pics--;
391 
392  /* flush the buffered audio packets */
393  if (!c->waiting_pics &&
394  (ret = flac_queue_flush(s)) < 0)
395  return ret;
396  }
397 
398  return 0;
399 }
400 
401 static const AVOption flacenc_options[] = {
402  { "write_header", "Write the file header", offsetof(FlacMuxerContext, write_header), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
403  { NULL },
404 };
405 
406 static const AVClass flac_muxer_class = {
407  .class_name = "flac muxer",
408  .item_name = av_default_item_name,
409  .option = flacenc_options,
410  .version = LIBAVUTIL_VERSION_INT,
411 };
412 
414  .name = "flac",
415  .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
416  .priv_data_size = sizeof(FlacMuxerContext),
417  .mime_type = "audio/x-flac",
418  .extensions = "flac",
419  .audio_codec = AV_CODEC_ID_FLAC,
420  .video_codec = AV_CODEC_ID_PNG,
421  .init = flac_init,
425  .deinit = flac_deinit,
427  .priv_class = &flac_muxer_class,
428 };
static void flac_deinit(struct AVFormatContext *s)
Definition: flacenc.c:344
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:703
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2549
AVOption.
Definition: opt.h:246
int ff_packet_list_put(AVPacketList **head, AVPacketList **tail, AVPacket *pkt, int flags)
Append an AVPacket to the list.
Definition: utils.c:444
static int flac_init(struct AVFormatContext *s)
Definition: flacenc.c:199
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
const char * desc
Definition: nvenc.c:79
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AVPacketList * queue
Definition: flacenc.c:41
int av_get_bits_per_pixel(const AVPixFmtDescriptor *pixdesc)
Return the number of bits per pixel used by the pixel format described by pixdesc.
Definition: pixdesc.c:2501
static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes, int last_block)
Definition: flacenc.c:50
AVOutputFormat ff_flac_muxer
Definition: flacenc.c:413
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int index
stream index in AVFormatContext
Definition: avformat.h:877
int size
Definition: packet.h:356
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:241
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
int ff_flac_is_native_layout(uint64_t channel_layout)
void * priv_data
Definition: avformat.h:891
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
Format I/O context.
Definition: avformat.h:1351
int ff_vorbiscomment_write(AVIOContext *pb, const AVDictionary *m, const char *vendor_string, AVChapter **chapters, unsigned int nb_chapters)
Write a VorbisComment into an AVIOContext.
Definition: vorbiscomment.c:65
char str[32]
Definition: internal.h:48
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
static int flac_queue_flush(AVFormatContext *s)
Definition: flacenc.c:297
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:64
uint8_t
int width
Video only.
Definition: codec_par.h:126
AVOptions.
static int flac_write_header(struct AVFormatContext *s)
Definition: flacenc.c:258
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
#define FF_PACKETLIST_FLAG_REF_PACKET
Create a new reference for the packet instead of transferring the ownership of the existing one to th...
Definition: internal.h:733
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
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1482
uint8_t * data
Definition: packet.h:355
enum AVCodecID id
Definition: internal.h:49
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
static int flac_finish_header(struct AVFormatContext *s)
Definition: flacenc.c:164
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:213
#define AVFMT_FLAG_BITEXACT
When muxing, try to avoid writing any random/volatile data to the output.
Definition: avformat.h:1499
static int flac_write_trailer(struct AVFormatContext *s)
Definition: flacenc.c:316
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
#define av_log(a,...)
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:276
static int flac_write_audio_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: flacenc.c:278
int updated_streaminfo
Definition: flacenc.c:45
static int flac_write_picture(struct AVFormatContext *s, AVPacket *pkt)
Definition: flacenc.c:78
const AVMetadataConv ff_vorbiscomment_metadata_conv[]
VorbisComment metadata conversion mapping.
Definition: vorbiscomment.c:33
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1591
AVPacket * av_packet_clone(const AVPacket *src)
Create a new packet that references the same data as src.
Definition: avpacket.c:650
FLAC (Free Lossless Audio Codec) decoder/demuxer common functions.
#define AVERROR(e)
Definition: error.h:43
uint8_t * av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
Definition: avpacket.c:353
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
static const AVOption flacenc_options[]
Definition: flacenc.c:401
const CodecMime ff_id3v2_mime_tags[]
Definition: id3v2.c:131
int write_header
Definition: flacenc.c:36
unsigned attached_types
Definition: flacenc.c:47
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1407
#define LIBAVFORMAT_IDENT
Definition: version.h:46
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
audio channel layout utility functions
void ffio_fill(AVIOContext *s, int b, int count)
Definition: aviobuf.c:199
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
Definition: avstring.c:213
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:98
void avio_wb24(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:465
const char * name
Definition: avformat.h:500
#define FLAC_STREAMINFO_SIZE
Definition: flac.h:34
#define s(width, name)
Definition: cbs_vp9.c:257
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1666
AVDictionary * metadata
Definition: avformat.h:940
static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m, int last_block, int bitexact)
Definition: flacenc.c:59
int64_t ff_vorbiscomment_length(const AVDictionary *m, const char *vendor_string, AVChapter **chapters, unsigned int nb_chapters)
Calculate the length in bytes of a VorbisComment.
Definition: vorbiscomment.c:41
#define FF_ARRAY_ELEMS(a)
#define AV_DISPOSITION_ATTACHED_PIC
The stream is stored in the file as an attached picture/"cover art" (e.g.
Definition: avformat.h:844
int metadata_header_padding
Number of bytes to be written as padding in a metadata header.
Definition: avformat.h:1851
Stream structure.
Definition: avformat.h:876
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:462
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format that the extradata buffer was...
Definition: packet.h:55
static const AVClass flac_muxer_class
Definition: flacenc.c:406
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:191
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:605
long long int64_t
Definition: coverity.c:34
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
Describe the class of an AVClass context structure.
Definition: log.h:67
cl_device_type type
int waiting_pics
Definition: flacenc.c:39
void ff_packet_list_free(AVPacketList **head, AVPacketList **tail)
Wipe the list and unref all the packets in it.
Definition: utils.c:1429
#define snprintf
Definition: snprintf.h:34
uint8_t streaminfo[FLAC_STREAMINFO_SIZE]
Definition: flacenc.c:44
#define flags(name, subs,...)
Definition: cbs_av1.c:576
AVPacketList * queue_end
Definition: flacenc.c:41
int ff_flac_write_header(AVIOContext *pb, const uint8_t *extradata, int extradata_size, int last_block)
static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: flacenc.c:353
int ff_packet_list_get(AVPacketList **head, AVPacketList **tail, AVPacket *pkt)
Remove the oldest AVPacket in the list and return it.
Definition: utils.c:1560
Main libavformat public API header.
int audio_stream_idx
Definition: flacenc.c:38
static double c[64]
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1618
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:929
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:927
void ff_metadata_conv(AVDictionary **pm, const AVMetadataConv *d_conv, const AVMetadataConv *s_conv)
Definition: metadata.c:26
char * value
Definition: dict.h:87
int len
void * priv_data
Format private data.
Definition: avformat.h:1379
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:375
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
const char *const ff_id3v2_picture_types[21]
Definition: id3v2.c:107
int stream_index
Definition: packet.h:357
This structure stores compressed data.
Definition: packet.h:332