FFmpeg
flacdec.c
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1 /*
2  * Raw FLAC demuxer
3  * Copyright (c) 2001 Fabrice Bellard
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 "libavcodec/avcodec.h"
24 #include "libavcodec/bytestream.h"
25 #include "libavcodec/flac.h"
26 #include "avformat.h"
27 #include "demux.h"
28 #include "flac_picture.h"
29 #include "internal.h"
30 #include "rawdec.h"
31 #include "oggdec.h"
32 #include "replaygain.h"
33 
34 #define SEEKPOINT_SIZE 18
35 
36 typedef struct FLACDecContext {
40 
41 static void reset_index_position(int64_t metadata_head_size, AVStream *st)
42 {
43  FFStream *const sti = ffstream(st);
44  /* the real seek index offset should be the size of metadata blocks with the offset in the frame blocks */
45  for (int i = 0; i < sti->nb_index_entries; i++)
46  sti->index_entries[i].pos += metadata_head_size;
47 }
48 
50 {
51  int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
52  uint8_t header[4];
53  uint8_t *buffer=NULL;
54  FLACDecContext *flac = s->priv_data;
56  if (!st)
57  return AVERROR(ENOMEM);
61  /* the parameters will be extracted from the compressed bitstream */
62 
63  /* if fLaC marker is not found, assume there is no header */
64  if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) {
65  avio_seek(s->pb, -4, SEEK_CUR);
66  return 0;
67  }
68 
69  /* process metadata blocks */
70  while (!avio_feof(s->pb) && !metadata_last) {
71  if (avio_read(s->pb, header, 4) != 4)
73  flac_parse_block_header(header, &metadata_last, &metadata_type,
74  &metadata_size);
75  switch (metadata_type) {
76  /* allocate and read metadata block for supported types */
83  if (!buffer) {
84  return AVERROR(ENOMEM);
85  }
86  if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
87  RETURN_ERROR(AVERROR(EIO));
88  }
89  break;
90  /* skip metadata block for unsupported types */
91  default:
92  ret = avio_skip(s->pb, metadata_size);
93  if (ret < 0)
94  return ret;
95  }
96 
97  if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
98  uint32_t samplerate;
99  uint64_t samples;
100 
101  /* STREAMINFO can only occur once */
102  if (found_streaminfo) {
104  }
105  if (metadata_size != FLAC_STREAMINFO_SIZE) {
107  }
108  found_streaminfo = 1;
109  st->codecpar->extradata = buffer;
110  st->codecpar->extradata_size = metadata_size;
111  buffer = NULL;
112 
113  /* get sample rate and sample count from STREAMINFO header;
114  * other parameters will be extracted by the parser */
115  samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
116  samples = (AV_RB64(st->codecpar->extradata + 13) >> 24) & ((1ULL << 36) - 1);
117 
118  /* set time base and duration */
119  if (samplerate > 0) {
120  avpriv_set_pts_info(st, 64, 1, samplerate);
121  if (samples > 0)
122  st->duration = samples;
123  }
124  } else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) {
125  uint8_t isrc[13];
126  uint64_t start;
127  const uint8_t *offset;
128  int i, chapters, track, ti;
129  if (metadata_size < 431)
131  offset = buffer + 395;
132  chapters = bytestream_get_byte(&offset) - 1;
133  if (chapters <= 0)
135  for (i = 0; i < chapters; i++) {
136  if (offset + 36 - buffer > metadata_size)
138  start = bytestream_get_be64(&offset);
139  track = bytestream_get_byte(&offset);
140  bytestream_get_buffer(&offset, isrc, 12);
141  isrc[12] = 0;
142  offset += 14;
143  ti = bytestream_get_byte(&offset);
144  if (ti <= 0) RETURN_ERROR(AVERROR_INVALIDDATA);
145  offset += ti * 12;
146  avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
147  }
148  av_freep(&buffer);
149  } else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) {
150  ret = ff_flac_parse_picture(s, &buffer, metadata_size, 1);
151  av_freep(&buffer);
152  if (ret < 0) {
153  av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n");
154  return ret;
155  }
156  } else if (metadata_type == FLAC_METADATA_TYPE_SEEKTABLE) {
157  const uint8_t *seekpoint = buffer;
158  int i, seek_point_count = metadata_size/SEEKPOINT_SIZE;
159  flac->found_seektable = 1;
160  if ((s->flags&AVFMT_FLAG_FAST_SEEK)) {
161  for(i=0; i<seek_point_count; i++) {
162  int64_t timestamp = bytestream_get_be64(&seekpoint);
163  int64_t pos = bytestream_get_be64(&seekpoint);
164  /* skip number of samples */
165  bytestream_get_be16(&seekpoint);
166  av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
167  }
168  }
169  av_freep(&buffer);
170  }
171  else {
172 
173  /* STREAMINFO must be the first block */
174  if (!found_streaminfo) {
176  }
177  /* process supported blocks other than STREAMINFO */
178  if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
179  AVDictionaryEntry *chmask;
180 
181  ret = ff_vorbis_comment(s, &s->metadata, buffer, metadata_size, 1);
182  if (ret < 0) {
183  av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
184  } else if (ret > 0) {
185  s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
186  }
187 
188  /* parse the channels mask if present */
189  chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
190  if (chmask) {
191  uint64_t mask = strtol(chmask->value, NULL, 0);
192  if (!mask || mask & ~0x3ffffULL) {
194  "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
195  } else {
197  av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
198  }
199  }
200  }
201  av_freep(&buffer);
202  }
203  }
204 
205  ret = ff_replaygain_export(st, s->metadata);
206  if (ret < 0)
207  return ret;
208 
209  reset_index_position(avio_tell(s->pb), st);
210  return 0;
211 
212 fail:
213  av_free(buffer);
214  return ret;
215 }
216 
217 static int raw_flac_probe(const AVProbeData *p)
218 {
219  if ((p->buf[2] & 0xF0) == 0) // blocksize code invalid
220  return 0;
221  if ((p->buf[2] & 0x0F) == 0x0F) // sample rate code invalid
222  return 0;
223  if ((p->buf[3] & 0xF0) >= FLAC_MAX_CHANNELS + FLAC_CHMODE_MID_SIDE << 4)
224  // channel mode invalid
225  return 0;
226  if ((p->buf[3] & 0x06) == 0x06) // bits per sample code invalid
227  return 0;
228  if ((p->buf[3] & 0x01) == 0x01) // reserved bit set
229  return 0;
230  return AVPROBE_SCORE_EXTENSION / 4 + 1;
231 }
232 
233 static int flac_probe(const AVProbeData *p)
234 {
235  if ((AV_RB16(p->buf) & 0xFFFE) == 0xFFF8)
236  return raw_flac_probe(p);
237 
238  /* file header + metadata header + checked bytes of streaminfo */
239  if (p->buf_size >= 4 + 4 + 13) {
240  int type = p->buf[4] & 0x7f;
241  int size = AV_RB24(p->buf + 5);
242  int min_block_size = AV_RB16(p->buf + 8);
243  int max_block_size = AV_RB16(p->buf + 10);
244  int sample_rate = AV_RB24(p->buf + 18) >> 4;
245 
246  if (memcmp(p->buf, "fLaC", 4))
247  return 0;
250  min_block_size >= 16 &&
251  max_block_size >= min_block_size &&
252  sample_rate && sample_rate <= 655350)
253  return AVPROBE_SCORE_MAX;
255  }
256 
257  return 0;
258 }
259 
260 static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_index,
261  int64_t *ppos, int64_t pos_limit)
262 {
263  FFFormatContext *const si = ffformatcontext(s);
264  AVPacket *const pkt = si->parse_pkt;
265  AVStream *st = s->streams[stream_index];
266  AVCodecParserContext *parser;
267  int ret;
268  int64_t pts = AV_NOPTS_VALUE;
269 
270  if (avio_seek(s->pb, *ppos, SEEK_SET) < 0)
271  return AV_NOPTS_VALUE;
272 
273  parser = av_parser_init(st->codecpar->codec_id);
274  if (!parser){
275  return AV_NOPTS_VALUE;
276  }
277  parser->flags |= PARSER_FLAG_USE_CODEC_TS;
278 
279  for (;;){
280  uint8_t *data;
281  int size;
282 
284  if (ret < 0){
285  if (ret == AVERROR(EAGAIN))
286  continue;
287  else {
289  av_assert1(!pkt->size);
290  }
291  }
292  av_parser_parse2(parser, ffstream(st)->avctx,
293  &data, &size, pkt->data, pkt->size,
294  pkt->pts, pkt->dts, *ppos);
295 
297  if (size) {
298  if (parser->pts != AV_NOPTS_VALUE){
299  // seeking may not have started from beginning of a frame
300  // calculate frame start position from next frame backwards
301  *ppos = parser->next_frame_offset - size;
302  pts = parser->pts;
303  break;
304  }
305  } else if (ret < 0)
306  break;
307  }
308  av_parser_close(parser);
309  return pts;
310 }
311 
312 static int flac_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) {
313  AVStream *const st = s->streams[0];
314  FFStream *const sti = ffstream(st);
315  int index;
316  int64_t pos;
317  AVIndexEntry e;
318  FLACDecContext *flac = s->priv_data;
319 
320  if (!flac->found_seektable || !(s->flags&AVFMT_FLAG_FAST_SEEK)) {
321  return -1;
322  }
323 
324  index = av_index_search_timestamp(st, timestamp, flags);
325  if (index < 0 || index >= sti->nb_index_entries)
326  return -1;
327 
328  e = sti->index_entries[index];
329  pos = avio_seek(s->pb, e.pos, SEEK_SET);
330  if (pos >= 0) {
331  return 0;
332  }
333  return -1;
334 }
335 
337  .name = "flac",
338  .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
339  .read_probe = flac_probe,
340  .read_header = flac_read_header,
341  .read_packet = ff_raw_read_partial_packet,
342  .read_seek = flac_seek,
343  .read_timestamp = flac_read_timestamp,
344  .flags = AVFMT_GENERIC_INDEX,
345  .extensions = "flac",
346  .raw_codec_id = AV_CODEC_ID_FLAC,
347  .priv_data_size = sizeof(FLACDecContext),
348  .priv_class = &ff_raw_demuxer_class,
349 };
avpriv_new_chapter
AVChapter * avpriv_new_chapter(AVFormatContext *s, int64_t id, AVRational time_base, int64_t start, int64_t end, const char *title)
Add a new chapter.
Definition: demux_utils.c:42
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:422
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:75
AVCodecParserContext::pts
int64_t pts
Definition: avcodec.h:2819
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:57
ffformatcontext
static av_always_inline FFFormatContext * ffformatcontext(AVFormatContext *s)
Definition: internal.h:191
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
av_unused
#define av_unused
Definition: attributes.h:131
flac_probe
static int flac_probe(const AVProbeData *p)
Definition: flacdec.c:233
AVPacket::data
uint8_t * data
Definition: packet.h:374
data
const char data[16]
Definition: mxf.c:146
FLACDecContext::rawctx
FFRawDemuxerContext rawctx
Definition: flacdec.c:37
AV_CODEC_ID_FLAC
@ AV_CODEC_ID_FLAC
Definition: codec_id.h:445
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:456
flac_read_header
static int flac_read_header(AVFormatContext *s)
Definition: flacdec.c:49
sample_rate
sample_rate
Definition: ffmpeg_filter.c:156
AVIndexEntry
Definition: avformat.h:807
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:815
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
flac_seek
static int flac_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: flacdec.c:312
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:413
fail
#define fail()
Definition: checkasm.h:133
av_add_index_entry
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: seek.c:120
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:505
FFRawDemuxerContext
Definition: rawdec.h:36
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:482
type
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 type
Definition: writing_filters.txt:86
av_parser_init
AVCodecParserContext * av_parser_init(int codec_id)
Definition: parser.c:32
pts
static int64_t pts
Definition: transcode_aac.c:654
SEEKPOINT_SIZE
#define SEEKPOINT_SIZE
Definition: flacdec.c:34
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:998
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
AVInputFormat
Definition: avformat.h:656
mask
static const uint16_t mask[17]
Definition: lzw.c:38
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:41
FLAC_METADATA_TYPE_VORBIS_COMMENT
@ FLAC_METADATA_TYPE_VORBIS_COMMENT
Definition: flac.h:50
ff_raw_read_partial_packet
int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawdec.c:34
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
flac_picture.h
reset_index_position
static void reset_index_position(int64_t metadata_head_size, AVStream *st)
Definition: flacdec.c:41
FFFormatContext
Definition: internal.h:71
FFStream::need_parsing
enum AVStreamParseType need_parsing
Definition: internal.h:386
ff_raw_demuxer_class
const AVClass ff_raw_demuxer_class
Definition: rawdec.c:142
ff_flac_demuxer
const AVInputFormat ff_flac_demuxer
Definition: flacdec.c:336
AVFormatContext
Format I/O context.
Definition: avformat.h:1216
internal.h
FLACDecContext
Definition: flacdec.c:36
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:978
NULL
#define NULL
Definition: coverity.c:32
rawdec.h
flac_parse_block_header
static av_always_inline void flac_parse_block_header(const uint8_t *block_header, int *last, int *type, int *size)
Parse the metadata block parameters from the header.
Definition: flac.h:63
FLAC_METADATA_TYPE_PICTURE
@ FLAC_METADATA_TYPE_PICTURE
Definition: flac.h:52
FFStream::nb_index_entries
int nb_index_entries
Definition: internal.h:253
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:453
FLAC_STREAMINFO_SIZE
#define FLAC_STREAMINFO_SIZE
Definition: flac.h:32
FLAC_METADATA_TYPE_SEEKTABLE
@ FLAC_METADATA_TYPE_SEEKTABLE
Definition: flac.h:49
AVCodecParserContext::flags
int flags
Definition: avcodec.h:2833
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:212
index
int index
Definition: gxfenc.c:89
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:463
ff_flac_parse_picture
int ff_flac_parse_picture(AVFormatContext *s, uint8_t **bufp, int buf_size, int truncate_workaround)
Parse a FLAC METADATA_BLOCK_PICTURE.
Definition: flac_picture.c:33
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:79
flac_read_timestamp
static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
Definition: flacdec.c:260
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
FLAC_METADATA_TYPE_STREAMINFO
@ FLAC_METADATA_TYPE_STREAMINFO
Definition: flac.h:46
AVPacket::size
int size
Definition: packet.h:375
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:115
FFFormatContext::parse_pkt
AVPacket * parse_pkt
The generic code uses this as a temporary packet to parse packets or for muxing, especially flushing.
Definition: internal.h:134
FFStream
Definition: internal.h:196
AVCodecParserContext::next_frame_offset
int64_t next_frame_offset
Definition: avcodec.h:2806
FLAC_CHMODE_MID_SIDE
@ FLAC_CHMODE_MID_SIDE
Definition: flac.h:42
size
int size
Definition: twinvq_data.h:10344
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
header
static const uint8_t header[24]
Definition: sdr2.c:67
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:373
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
FLAC_METADATA_TYPE_CUESHEET
@ FLAC_METADATA_TYPE_CUESHEET
Definition: flac.h:51
AVFMT_FLAG_FAST_SEEK
#define AVFMT_FLAG_FAST_SEEK
Enable fast, but inaccurate seeks for some formats.
Definition: avformat.h:1356
RETURN_ERROR
#define RETURN_ERROR(code)
Definition: flac_picture.h:27
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:367
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:264
demux.h
avcodec.h
AVCodecParserContext
Definition: avcodec.h:2800
bytestream_get_buffer
static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, uint8_t *dst, unsigned int size)
Definition: bytestream.h:363
av_channel_layout_from_mask
FF_ENABLE_DEPRECATION_WARNINGS int av_channel_layout_from_mask(AVChannelLayout *channel_layout, uint64_t mask)
Initialize a native channel layout from a bitmask indicating which channels are present.
Definition: channel_layout.c:389
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
FLACDecContext::found_seektable
int found_seektable
Definition: flacdec.c:38
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
FLAC_MAX_CHANNELS
#define FLAC_MAX_CHANNELS
Definition: flac.h:33
oggdec.h
channel_layout.h
buffer
the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer
Definition: filter_design.txt:49
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:641
PARSER_FLAG_USE_CODEC_TS
#define PARSER_FLAG_USE_CODEC_TS
Definition: avcodec.h:2838
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:808
AVSTREAM_PARSE_FULL_RAW
@ AVSTREAM_PARSE_FULL_RAW
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:802
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:347
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:251
av_parser_parse2
int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos)
Parse a packet.
Definition: parser.c:115
raw_flac_probe
static int raw_flac_probe(const AVProbeData *p)
Definition: flacdec.c:217
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
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
AVPacket
This structure stores compressed data.
Definition: packet.h:351
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:71
bytestream.h
replaygain.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
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
AVDictionaryEntry::value
char * value
Definition: dict.h:81
flac.h
ff_vorbis_comment
int ff_vorbis_comment(AVFormatContext *ms, AVDictionary **m, const uint8_t *buf, int size, int parse_picture)
Parse Vorbis comments.
Definition: oggparsevorbis.c:148
AV_RB24
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_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:97
AV_RB64
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_RB64
Definition: bytestream.h:95
AVFMT_EVENT_FLAG_METADATA_UPDATED
#define AVFMT_EVENT_FLAG_METADATA_UPDATED
Definition: avformat.h:1533
av_parser_close
void av_parser_close(AVCodecParserContext *s)
Definition: parser.c:189
AV_RB16
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_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:98
av_index_search_timestamp
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: seek.c:240
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:375