FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
oggparseflac.c
Go to the documentation of this file.
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  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 
65  return AVERROR(ENOMEM);
66  memcpy(st->codec->extradata, streaminfo_start, st->codec->extradata_size);
67 
68  samplerate = AV_RB24(st->codec->extradata + 10) >> 4;
69  if (!samplerate)
70  return AVERROR_INVALIDDATA;
71 
72  avpriv_set_pts_info(st, 64, 1, samplerate);
73  } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
74  ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4);
75  }
76 
77  return 1;
78 }
79 
80 static int
82 {
83  struct ogg *ogg = s->priv_data;
84  AVStream *st = s->streams[idx];
85  struct ogg_stream *os = ogg->streams + idx;
87  int size;
88  uint8_t *data;
89 
90  if (!parser)
91  return -1;
92 
95 
97  av_parser_parse2(parser, st->codec,
98  &data, &size, os->buf + os->pstart, os->psize,
100 
101  av_parser_close(parser);
102 
103  if (st->codec->sample_rate) {
104  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
105  return 0;
106  }
107 
108  return 1;
109 }
110 
111 const struct ogg_codec ff_flac_codec = {
112  .magic = "\177FLAC",
113  .magicsize = 5,
114  .header = flac_header,
115  .nb_header = 2,
116 };
117 
118 const struct ogg_codec ff_old_flac_codec = {
119  .magic = "fLaC",
120  .magicsize = 4,
121  .header = old_flac_header,
122  .nb_header = 0,
123 };
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define OGG_FLAC_METADATA_TYPE_STREAMINFO
Definition: oggparseflac.c:28
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård.
Definition: oggdec.h:31
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
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:4083
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:217
Format I/O context.
Definition: avformat.h:1273
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:1034
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1617
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1341
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:101
FLAC (Free Lossless Audio Codec) decoder/demuxer common functions.
#define AVERROR(e)
Definition: error.h:43
int ff_vorbis_stream_comment(AVFormatContext *as, AVStream *st, const uint8_t *buf, int size)
#define PARSER_FLAG_COMPLETE_FRAMES
Definition: avcodec.h:4573
const struct ogg_codec ff_flac_codec
Definition: oggparseflac.c:111
Only parse headers, do not repack.
Definition: avformat.h:775
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
static int old_flac_header(AVFormatContext *s, int idx)
Definition: oggparseflac.c:81
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:131
unsigned int pstart
Definition: oggdec.h:65
void av_parser_close(AVCodecParserContext *s)
Definition: parser.c:221
struct ogg_stream * streams
Definition: oggdec.h:102
#define FLAC_STREAMINFO_SIZE
Definition: flac.h:34
Stream structure.
Definition: avformat.h:842
AVCodecParserContext * av_parser_init(int codec_id)
Definition: parser.c:50
enum AVMediaType codec_type
Definition: avcodec.h:1510
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:87
enum AVCodecID codec_id
Definition: avcodec.h:1519
int sample_rate
samples per second
Definition: avcodec.h:2262
int ff_alloc_extradata(AVCodecContext *avctx, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:2924
int extradata_size
Definition: avcodec.h:1618
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:329
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:410
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:337
const int8_t * magic
Definition: oggdec.h:32
uint8_t * buf
Definition: oggdec.h:62
Main libavformat public API header.
Definition: oggdec.h:101
void * priv_data
Format private data.
Definition: avformat.h:1301
const struct ogg_codec ff_old_flac_codec
Definition: oggparseflac.c:118
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240