Libav
oggparseflac.c
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1 /*
2  * Copyright (C) 2005 Matthieu CASTET
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <stdlib.h>
22 #include "libavcodec/get_bits.h"
23 #include "libavcodec/flac.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "oggdec.h"
27 
28 #define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
29 
30 static int
32 {
33  struct ogg *ogg = s->priv_data;
34  struct ogg_stream *os = ogg->streams + idx;
35  AVStream *st = s->streams[idx];
36  GetBitContext gb;
37  int mdt;
38 
39  if (os->buf[os->pstart] == 0xff)
40  return 0;
41 
42  init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
43  skip_bits1(&gb); /* metadata_last */
44  mdt = get_bits(&gb, 7);
45 
47  uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
48  uint32_t samplerate;
49 
50  skip_bits_long(&gb, 4*8); /* "FLAC" */
51  if(get_bits(&gb, 8) != 1) /* unsupported major version */
52  return -1;
53  skip_bits_long(&gb, 8 + 16); /* minor version + header count */
54  skip_bits_long(&gb, 4*8); /* "fLaC" */
55 
56  /* METADATA_BLOCK_HEADER */
57  if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
58  return -1;
59 
63 
64  st->codecpar->extradata =
66  memcpy(st->codecpar->extradata, streaminfo_start, FLAC_STREAMINFO_SIZE);
68 
69  samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
70  if (!samplerate)
71  return AVERROR_INVALIDDATA;
72 
73  avpriv_set_pts_info(st, 64, 1, samplerate);
74  } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
75  ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4);
76  }
77 
78  return 1;
79 }
80 
81 static int
83 {
84  AVStream *st = s->streams[idx];
87 
88  return 0;
89 }
90 
91 const struct ogg_codec ff_flac_codec = {
92  .magic = "\177FLAC",
93  .magicsize = 5,
94  .header = flac_header,
95  .nb_header = 2,
96 };
97 
98 const struct ogg_codec ff_old_flac_codec = {
99  .magic = "fLaC",
100  .magicsize = 4,
101  .header = old_flac_header,
102  .nb_header = 0,
103 };
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
#define OGG_FLAC_METADATA_TYPE_STREAMINFO
Definition: oggparseflac.c:28
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård.
Definition: oggdec.h:31
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:228
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:2986
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:187
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3483
#define AV_RB24
Definition: intreadwrite.h:64
Format I/O context.
Definition: avformat.h:940
unsigned int psize
Definition: oggdec.h:66
uint8_t
static int flac_header(AVFormatContext *s, int idx)
Definition: oggparseflac.c:31
enum AVStreamParseType need_parsing
Definition: avformat.h:879
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1008
bitstream reader API header.
FLAC (Free Lossless Audio Codec) decoder/demuxer common functions.
int ff_vorbis_stream_comment(AVFormatContext *as, AVStream *st, const uint8_t *buf, int size)
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3479
const struct ogg_codec ff_flac_codec
Definition: oggparseflac.c:91
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3501
Only parse headers, do not repack.
Definition: avformat.h:658
static int old_flac_header(AVFormatContext *s, int idx)
Definition: oggparseflac.c:82
unsigned int pstart
Definition: oggdec.h:65
struct ogg_stream * streams
Definition: oggdec.h:97
#define FLAC_STREAMINFO_SIZE
Definition: flac.h:34
Stream structure.
Definition: avformat.h:705
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:292
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:362
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:300
const int8_t * magic
Definition: oggdec.h:32
uint8_t * buf
Definition: oggdec.h:62
Main libavformat public API header.
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:638
Definition: oggdec.h:96
void * priv_data
Format private data.
Definition: avformat.h:968
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3497
AVCodecParameters * codecpar
Definition: avformat.h:831
const struct ogg_codec ff_old_flac_codec
Definition: oggparseflac.c:98