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  FLACStreaminfo si;
38  int mdt;
39 
40  if (os->buf[os->pstart] == 0xff)
41  return 0;
42 
43  init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
44  skip_bits1(&gb); /* metadata_last */
45  mdt = get_bits(&gb, 7);
46 
48  uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
49  skip_bits_long(&gb, 4*8); /* "FLAC" */
50  if(get_bits(&gb, 8) != 1) /* unsupported major version */
51  return -1;
52  skip_bits_long(&gb, 8 + 16); /* minor version + header count */
53  skip_bits_long(&gb, 4*8); /* "fLaC" */
54 
55  /* METADATA_BLOCK_HEADER */
56  if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
57  return -1;
58 
59  avpriv_flac_parse_streaminfo(st->codec, &si, streaminfo_start);
60 
63 
64  st->codec->extradata =
66  memcpy(st->codec->extradata, streaminfo_start, FLAC_STREAMINFO_SIZE);
68 
69  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
70  } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
71  ff_vorbis_comment (s, &st->metadata, os->buf + os->pstart + 4, os->psize - 4);
72  }
73 
74  return 1;
75 }
76 
77 static int
79 {
80  AVStream *st = s->streams[idx];
83 
84  return 0;
85 }
86 
87 const struct ogg_codec ff_flac_codec = {
88  .magic = "\177FLAC",
89  .magicsize = 5,
90  .header = flac_header
91 };
92 
93 const struct ogg_codec ff_old_flac_codec = {
94  .magic = "fLaC",
95  .magicsize = 4,
96  .header = old_flac_header
97 };
#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:237
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the pts for a given stream.
Definition: utils.c:3828
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:197
Format I/O context.
Definition: avformat.h:863
unsigned int psize
Definition: oggdec.h:66
static int flac_header(AVFormatContext *s, int idx)
Definition: oggparseflac.c:31
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1387
AVStream ** streams
Definition: avformat.h:908
bitstream reader API header.
int ff_vorbis_comment(AVFormatContext *ms, AVDictionary **m, const uint8_t *buf, int size)
FLAC (Free Lossless Audio Codec) decoder/demuxer common functions.
const struct ogg_codec ff_flac_codec
Definition: oggparseflac.c:87
AVCodecContext * codec
codec context
Definition: avformat.h:623
void avpriv_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s, const uint8_t *buffer)
Parse the Streaminfo metadata block.
Definition: flacdec.c:147
static int old_flac_header(AVFormatContext *s, int idx)
Definition: oggparseflac.c:78
unsigned int pstart
Definition: oggdec.h:65
struct ogg_stream * streams
Definition: oggdec.h:95
#define FLAC_STREAMINFO_SIZE
Definition: flac.h:33
AVDictionary * metadata
Definition: avformat.h:718
Stream structure.
Definition: avformat.h:620
enum AVMediaType codec_type
Definition: avcodec.h:1574
int sample_rate
samples per second
Definition: avcodec.h:1456
int extradata_size
Definition: avcodec.h:1388
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:293
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:64
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:354
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:497
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:301
const int8_t * magic
Definition: oggdec.h:32
uint8_t * buf
Definition: oggdec.h:62
Main libavformat public API header.
Definition: oggdec.h:94
void * priv_data
Format private data.
Definition: avformat.h:883
const struct ogg_codec ff_old_flac_codec
Definition: oggparseflac.c:93
enum CodecID codec_id
Definition: avcodec.h:1575