FFmpeg
mpc8.c
Go to the documentation of this file.
1 /*
2  * Musepack SV8 demuxer
3  * Copyright (c) 2007 Konstantin Shishkov
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 "libavcodec/get_bits.h"
23 #include "libavcodec/unary.h"
24 #include "apetag.h"
25 #include "avformat.h"
26 #include "demux.h"
27 #include "internal.h"
28 #include "avio_internal.h"
29 
30 /// Two-byte MPC tag
31 #define MKMPCTAG(a, b) ((a) | ((b) << 8))
32 
33 #define TAG_MPCK MKTAG('M','P','C','K')
34 
35 /// Reserved MPC tags
37  TAG_STREAMHDR = MKMPCTAG('S','H'),
38  TAG_STREAMEND = MKMPCTAG('S','E'),
39 
41 
43  TAG_SEEKTABLE = MKMPCTAG('S','T'),
44 
46  TAG_ENCINFO = MKMPCTAG('E','I'),
47 };
48 
49 static const int mpc8_rate[8] = { 44100, 48000, 37800, 32000, -1, -1, -1, -1 };
50 
51 typedef struct MPCContext {
52  int ver;
53  int64_t header_pos;
54  int64_t samples;
55 
56  int64_t apetag_start;
57 } MPCContext;
58 
59 static inline int64_t bs_get_v(const uint8_t **bs)
60 {
61  uint64_t v = 0;
62  int br = 0;
63  int c;
64 
65  do {
66  c = **bs; (*bs)++;
67  v <<= 7;
68  v |= c & 0x7F;
69  br++;
70  if (br > 10)
71  return -1;
72  } while (c & 0x80);
73 
74  return v - br;
75 }
76 
77 static int mpc8_probe(const AVProbeData *p)
78 {
79  const uint8_t *bs = p->buf + 4;
80  const uint8_t *bs_end = bs + p->buf_size;
81  int64_t size;
82 
83  if (p->buf_size < 16)
84  return 0;
85  if (AV_RL32(p->buf) != TAG_MPCK)
86  return 0;
87  while (bs < bs_end + 3) {
88  int header_found = (bs[0] == 'S' && bs[1] == 'H');
89  if (bs[0] < 'A' || bs[0] > 'Z' || bs[1] < 'A' || bs[1] > 'Z')
90  return 0;
91  bs += 2;
92  size = bs_get_v(&bs);
93  if (size < 2)
94  return 0;
95  if (size >= bs_end - bs + 2)
96  return AVPROBE_SCORE_EXTENSION - 1; // seems to be valid MPC but no header yet
97  if (header_found) {
98  if (size < 11 || size > 28)
99  return 0;
100  if (!AV_RL32(bs)) //zero CRC is invalid
101  return 0;
102  return AVPROBE_SCORE_MAX;
103  } else {
104  bs += size - 2;
105  }
106  }
107  return 0;
108 }
109 
110 static inline int64_t gb_get_v(GetBitContext *gb)
111 {
112  uint64_t v = 0;
113  int bits = 0;
114  while(get_bits1(gb) && bits < 64-7){
115  v <<= 7;
116  v |= get_bits(gb, 7);
117  bits += 7;
118  }
119  v <<= 7;
120  v |= get_bits(gb, 7);
121 
122  return v;
123 }
124 
125 static void mpc8_get_chunk_header(AVIOContext *pb, int *tag, int64_t *size)
126 {
127  int64_t pos;
128  pos = avio_tell(pb);
129  *tag = avio_rl16(pb);
130  *size = ffio_read_varlen(pb);
131  pos -= avio_tell(pb);
132  if (av_sat_add64(*size, pos) != (uint64_t)*size + pos) {
133  *size = -1;
134  } else
135  *size += pos;
136 }
137 
138 static void mpc8_parse_seektable(AVFormatContext *s, int64_t off)
139 {
140  MPCContext *c = s->priv_data;
141  int tag;
142  int64_t size, pos, ppos[2];
143  uint8_t *buf;
144  int i, t, seekd, ret;
145  GetBitContext gb;
146 
147  if (s->nb_streams == 0) {
148  av_log(s, AV_LOG_ERROR, "No stream added before parsing seek table\n");
149  return;
150  }
151 
152  avio_seek(s->pb, off, SEEK_SET);
153  mpc8_get_chunk_header(s->pb, &tag, &size);
154  if(tag != TAG_SEEKTABLE){
155  av_log(s, AV_LOG_ERROR, "No seek table at given position\n");
156  return;
157  }
158  if (size > INT_MAX/10 || size<=0) {
159  av_log(s, AV_LOG_ERROR, "Bad seek table size\n");
160  return;
161  }
163  return;
164  ret = avio_read(s->pb, buf, size);
165  if (ret != size) {
166  av_log(s, AV_LOG_ERROR, "seek table truncated\n");
167  av_free(buf);
168  return;
169  }
170  memset(buf+size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
171 
172  init_get_bits(&gb, buf, size * 8);
173  size = gb_get_v(&gb);
174  if(size > UINT_MAX/4 || size > c->samples/1152){
175  av_log(s, AV_LOG_ERROR, "Seek table is too big\n");
176  av_free(buf);
177  return;
178  }
179  seekd = get_bits(&gb, 4);
180  for(i = 0; i < 2; i++){
181  pos = gb_get_v(&gb);
182  if (av_sat_add64(pos, c->header_pos) != pos + (uint64_t)c->header_pos) {
183  av_free(buf);
184  return;
185  }
186 
187  pos += c->header_pos;
188  ppos[1 - i] = pos;
189  av_add_index_entry(s->streams[0], pos, i, 0, 0, AVINDEX_KEYFRAME);
190  }
191  for(; i < size; i++){
192  if (get_bits_left(&gb) < 13) {
193  av_free(buf);
194  return;
195  }
196  t = get_unary(&gb, 1, 33) << 12;
197  t += get_bits(&gb, 12);
198  if(t & 1)
199  t = -(t & ~1);
200  pos = (t >> 1) + (uint64_t)ppos[0]*2 - ppos[1];
201  av_add_index_entry(s->streams[0], pos, (int64_t)i << seekd, 0, 0, AVINDEX_KEYFRAME);
202  ppos[1] = ppos[0];
203  ppos[0] = pos;
204  }
205  av_free(buf);
206 }
207 
208 static void mpc8_handle_chunk(AVFormatContext *s, int tag, int64_t chunk_pos, int64_t size)
209 {
210  AVIOContext *pb = s->pb;
211  int64_t pos, off;
212 
213  switch(tag){
214  case TAG_SEEKTBLOFF:
215  pos = avio_tell(pb);
216  off = ffio_read_varlen(pb);
217  if (pos > INT64_MAX - size || off < 0 || off > INT64_MAX - chunk_pos)
218  return;
219  pos += size;
220  mpc8_parse_seektable(s, chunk_pos + off);
221  avio_seek(pb, pos, SEEK_SET);
222  break;
223  default:
224  avio_skip(pb, size);
225  }
226 }
227 
229 {
230  MPCContext *c = s->priv_data;
231  AVIOContext *pb = s->pb;
232  AVStream *st;
233  int tag = 0, ret;
234  int channels;
235  int64_t size, pos;
236 
237  c->header_pos = avio_tell(pb);
238  if(avio_rl32(pb) != TAG_MPCK){
239  av_log(s, AV_LOG_ERROR, "Not a Musepack8 file\n");
240  return AVERROR_INVALIDDATA;
241  }
242 
243  while(!avio_feof(pb)){
244  pos = avio_tell(pb);
246  if (size < 0) {
247  av_log(s, AV_LOG_ERROR, "Invalid chunk length\n");
248  return AVERROR_INVALIDDATA;
249  }
250  if(tag == TAG_STREAMHDR)
251  break;
253  }
254  if(tag != TAG_STREAMHDR){
255  av_log(s, AV_LOG_ERROR, "Stream header not found\n");
256  return AVERROR_INVALIDDATA;
257  }
258  pos = avio_tell(pb);
259  avio_skip(pb, 4); //CRC
260  c->ver = avio_r8(pb);
261  if(c->ver != 8){
262  avpriv_report_missing_feature(s, "Stream version %d", c->ver);
263  return AVERROR_PATCHWELCOME;
264  }
265  c->samples = ffio_read_varlen(pb);
266  ffio_read_varlen(pb); //silence samples at the beginning
267 
268  st = avformat_new_stream(s, NULL);
269  if (!st)
270  return AVERROR(ENOMEM);
274 
275  if ((ret = ff_get_extradata(s, st->codecpar, pb, 2)) < 0)
276  return ret;
277 
278  channels = (st->codecpar->extradata[1] >> 4) + 1;
280  st->codecpar->sample_rate = mpc8_rate[st->codecpar->extradata[0] >> 5];
281  avpriv_set_pts_info(st, 64, 1152 << (st->codecpar->extradata[1]&3)*2, st->codecpar->sample_rate);
282  st->start_time = 0;
283  st->duration = c->samples / (1152 << (st->codecpar->extradata[1]&3)*2);
284  size -= avio_tell(pb) - pos;
285  if (size > 0)
286  avio_skip(pb, size);
287 
288  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
289  int64_t pos = avio_tell(s->pb);
290  c->apetag_start = ff_ape_parse_tag(s);
291  avio_seek(s->pb, pos, SEEK_SET);
292  }
293 
294  return 0;
295 }
296 
298 {
299  MPCContext *c = s->priv_data;
300  int tag, ret;
301  int64_t pos, size;
302 
303  while(!avio_feof(s->pb)){
304  pos = avio_tell(s->pb);
305 
306  /* don't return bogus packets with the ape tag data */
307  if (c->apetag_start && pos >= c->apetag_start)
308  return AVERROR_EOF;
309 
310  mpc8_get_chunk_header(s->pb, &tag, &size);
311  if (size < 0 || size > INT_MAX)
312  return -1;
313  if(tag == TAG_AUDIOPACKET){
314  if ((ret = av_get_packet(s->pb, pkt, size)) < 0)
315  return ret;
316  pkt->stream_index = 0;
317  pkt->duration = 1;
318  return 0;
319  }
320  if(tag == TAG_STREAMEND)
321  return AVERROR_EOF;
323  }
324  return AVERROR_EOF;
325 }
326 
327 static int mpc8_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
328 {
329  AVStream *st = s->streams[stream_index];
330  FFStream *const sti = ffstream(st);
331  int index = av_index_search_timestamp(st, timestamp, flags);
332 
333  if(index < 0) return -1;
334  if (avio_seek(s->pb, sti->index_entries[index].pos, SEEK_SET) < 0)
335  return -1;
337  return 0;
338 }
339 
340 
342  .name = "mpc8",
343  .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
344  .priv_data_size = sizeof(MPCContext),
349 };
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:75
ff_mpc8_demuxer
const AVInputFormat ff_mpc8_demuxer
Definition: mpc8.c:341
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:850
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
TAG_AUDIOPACKET
@ TAG_AUDIOPACKET
Definition: mpc8.c:40
TAG_ENCINFO
@ TAG_ENCINFO
Definition: mpc8.c:46
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
mpc8_read_seek
static int mpc8_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: mpc8.c:327
apetag.h
mpc8_get_chunk_header
static void mpc8_get_chunk_header(AVIOContext *pb, int *tag, int64_t *size)
Definition: mpc8.c:125
MPCContext
Definition: mpc.h:54
mpc8_read_packet
static int mpc8_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpc8.c:297
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:392
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:456
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:300
mpc8_parse_seektable
static void mpc8_parse_seektable(AVFormatContext *s, int64_t off)
Definition: mpc8.c:138
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:660
avpriv_update_cur_dts
void avpriv_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
Update cur_dts of all streams based on the given timestamp and AVStream.
Definition: seek.c:33
ff_ape_parse_tag
int64_t ff_ape_parse_tag(AVFormatContext *s)
Read and parse an APE tag.
Definition: apetag.c:109
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:815
ff_get_extradata
int ff_get_extradata(void *logctx, AVCodecParameters *par, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: demux_utils.c:355
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:465
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:380
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:697
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:407
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:151
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:118
GetBitContext
Definition: get_bits.h:62
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
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:743
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
mpc8_read_header
static int mpc8_read_header(AVFormatContext *s)
Definition: mpc8.c:228
s
#define s(width, name)
Definition: cbs_vp9.c:256
TAG_SEEKTABLE
@ TAG_SEEKTABLE
Definition: mpc8.c:43
TAG_STREAMEND
@ TAG_STREAMEND
Definition: mpc8.c:38
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
bits
uint8_t bits
Definition: vp3data.h:141
AVIndexEntry::timestamp
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:809
channels
channels
Definition: aptx.h:32
get_bits.h
AVFormatContext
Format I/O context.
Definition: avformat.h:1213
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:529
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
gb_get_v
static int64_t gb_get_v(GetBitContext *gb)
Definition: mpc8.c:110
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:499
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:453
MPCContext::samples
int64_t samples
Definition: mpc8.c:54
TAG_MPCK
#define TAG_MPCK
Definition: mpc8.c:33
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:212
index
int index
Definition: gxfenc.c:89
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
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:463
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:177
get_unary
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
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:116
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:263
FFStream
Definition: internal.h:197
TAG_SEEKTBLOFF
@ TAG_SEEKTBLOFF
Definition: mpc8.c:42
size
int size
Definition: twinvq_data.h:10344
avpriv_report_missing_feature
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:632
ffio_read_varlen
uint64_t ffio_read_varlen(AVIOContext *bc)
Definition: aviobuf.c:945
unary.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
avio_internal.h
demux.h
av_get_packet
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:102
tag
uint32_t tag
Definition: movenc.c:1630
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:948
MPCContext::header_pos
int64_t header_pos
Definition: mpc8.c:53
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:260
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
AV_CODEC_ID_MUSEPACK8
@ AV_CODEC_ID_MUSEPACK8
Definition: codec_id.h:459
av_sat_add64
#define av_sat_add64
Definition: common.h:137
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
MKMPCTAG
#define MKMPCTAG(a, b)
Two-byte MPC tag.
Definition: mpc8.c:31
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:41
MPCContext::apetag_start
int64_t apetag_start
Definition: mpc8.c:56
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:641
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:808
AVPacket::stream_index
int stream_index
Definition: packet.h:376
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:347
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:252
mpc8_handle_chunk
static void mpc8_handle_chunk(AVFormatContext *s, int tag, int64_t chunk_pos, int64_t size)
Definition: mpc8.c:208
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:103
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:61
AVPacket
This structure stores compressed data.
Definition: packet.h:351
TAG_STREAMHDR
@ TAG_STREAMHDR
Definition: mpc8.c:37
TAG_REPLAYGAIN
@ TAG_REPLAYGAIN
Definition: mpc8.c:45
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
MPCContext::ver
int ver
Definition: mpc.c:41
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
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
mpc8_probe
static int mpc8_probe(const AVProbeData *p)
Definition: mpc8.c:77
bs_get_v
static int64_t bs_get_v(const uint8_t **bs)
Definition: mpc8.c:59
MPCPacketTags
MPCPacketTags
Reserved MPC tags.
Definition: mpc8.c:36
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:238
mpc8_rate
static const int mpc8_rate[8]
Definition: mpc8.c:49
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:375