FFmpeg  2.1.1
oggparseflac.c
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1 /*
2  * Copyright (C) 2005 Matthieu CASTET
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 
64 
66  return AVERROR(ENOMEM);
67  memcpy(st->codec->extradata, streaminfo_start, st->codec->extradata_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  struct ogg *ogg = s->priv_data;
81  AVStream *st = s->streams[idx];
82  struct ogg_stream *os = ogg->streams + idx;
84  int size;
85  uint8_t *data;
86 
87  if (!parser)
88  return -1;
89 
92 
94  av_parser_parse2(parser, st->codec,
95  &data, &size, os->buf + os->pstart, os->psize,
97 
98  av_parser_close(parser);
99 
100  if (st->codec->sample_rate) {
101  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
102  return 0;
103  }
104 
105  return 1;
106 }
107 
108 const struct ogg_codec ff_flac_codec = {
109  .magic = "\177FLAC",
110  .magicsize = 5,
111  .header = flac_header,
112  .nb_header = 2,
113 };
114 
115 const struct ogg_codec ff_old_flac_codec = {
116  .magic = "fLaC",
117  .magicsize = 4,
118  .header = old_flac_header,
119  .nb_header = 0,
120 };
const char * s
Definition: avisynth_c.h:668
#define OGG_FLAC_METADATA_TYPE_STREAMINFO
Definition: oggparseflac.c:28
int size
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:255
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:3922
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:212
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:686
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1254
AVDictionary * metadata
Definition: avformat.h:735
Format I/O context.
Definition: avformat.h:968
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:812
const char data[16]
Definition: mxf.c:68
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.
void * priv_data
Format private data.
Definition: avformat.h:988
#define PARSER_FLAG_COMPLETE_FRAMES
Definition: avcodec.h:3961
void avpriv_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s, const uint8_t *buffer)
Parse the Streaminfo metadata block.
Definition: flac.c:204
static int old_flac_header(AVFormatContext *s, int idx)
Definition: oggparseflac.c:78
struct ogg_codec ff_old_flac_codec
Definition: oggparseflac.c:115
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:114
unsigned int pstart
Definition: oggdec.h:65
AVStream ** streams
Definition: avformat.h:1016
void av_parser_close(AVCodecParserContext *s)
Definition: parser.c:204
struct ogg_stream * streams
Definition: oggdec.h:100
AVCodecParserContext * av_parser_init(int codec_id)
Definition: parser.c:43
#define FLAC_STREAMINFO_SIZE
Definition: flac.h:33
Stream structure.
Definition: avformat.h:667
enum AVMediaType codec_type
Definition: avcodec.h:1154
enum AVCodecID codec_id
Definition: avcodec.h:1157
int sample_rate
samples per second
Definition: avcodec.h:1873
int ff_alloc_extradata(AVCodecContext *avctx, int size)
Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:2690
int extradata_size
Definition: avcodec.h:1255
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:324
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:405
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:332
const int8_t * magic
Definition: oggdec.h:32
uint8_t * buf
Definition: oggdec.h:62
Main libavformat public API header.
struct ogg_codec ff_flac_codec
Definition: oggparseflac.c:108
Definition: oggdec.h:99
#define AVERROR(e)
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avcodec.h:2278
Only parse headers, do not repack.
Definition: avformat.h:600