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libavformat
oggparsecelt.c
Go to the documentation of this file.
1
/*
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* Xiph CELT parser for Ogg
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* Copyright (c) 2011 Nicolas George
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include "
libavutil/intreadwrite.h
"
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#include "
avformat.h
"
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#include "
internal.h
"
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#include "
oggdec.h
"
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struct
oggcelt_private
{
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int
extra_headers_left
;
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};
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static
int
celt_header
(
AVFormatContext
*
s
,
int
idx)
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{
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struct
ogg
*
ogg
= s->
priv_data
;
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struct
ogg_stream
*os = ogg->
streams
+ idx;
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AVStream
*st = s->
streams
[idx];
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struct
oggcelt_private
*priv = os->
private
;
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uint8_t
*p = os->
buf
+ os->
pstart
;
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if
(os->
psize
== 60 &&
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!memcmp(p,
ff_celt_codec
.
magic
,
ff_celt_codec
.
magicsize
)) {
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/* Main header */
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uint32_t
version
,
sample_rate
,
nb_channels
;
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uint32_t overlap, extra_headers;
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priv =
av_malloc
(
sizeof
(
struct
oggcelt_private
));
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if
(!priv)
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return
AVERROR
(ENOMEM);
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if
(
ff_alloc_extradata
(st->
codec
, 2 *
sizeof
(uint32_t)) < 0) {
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av_free
(priv);
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return
AVERROR
(ENOMEM);
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}
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version =
AV_RL32
(p + 28);
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/* unused header size field skipped */
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sample_rate =
AV_RL32
(p + 36);
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nb_channels =
AV_RL32
(p + 40);
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overlap =
AV_RL32
(p + 48);
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/* unused bytes per packet field skipped */
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extra_headers =
AV_RL32
(p + 56);
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st->
codec
->
codec_type
=
AVMEDIA_TYPE_AUDIO
;
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st->
codec
->
codec_id
=
AV_CODEC_ID_CELT
;
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st->
codec
->
sample_rate
=
sample_rate
;
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st->
codec
->
channels
=
nb_channels
;
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if
(sample_rate)
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avpriv_set_pts_info
(st, 64, 1, sample_rate);
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priv->
extra_headers_left
= 1 + extra_headers;
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av_free
(os->
private
);
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os->
private
= priv;
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AV_WL32
(st->
codec
->
extradata
+ 0, overlap);
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AV_WL32
(st->
codec
->
extradata
+ 4, version);
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return
1;
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}
else
if
(priv && priv->
extra_headers_left
) {
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/* Extra headers (vorbiscomment) */
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ff_vorbis_stream_comment
(s, st, p, os->
psize
);
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priv->
extra_headers_left
--;
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return
1;
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}
else
{
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return
0;
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}
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}
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const
struct
ogg_codec
ff_celt_codec
= {
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.
magic
=
"CELT "
,
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.magicsize = 8,
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.header =
celt_header
,
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.nb_header = 2,
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};
s
const char * s
Definition:
avisynth_c.h:631
ogg_codec
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård.
Definition:
oggdec.h:31
avpriv_set_pts_info
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:4149
oggcelt_private::extra_headers_left
int extra_headers_left
Definition:
oggparsecelt.c:30
celt_header
static int celt_header(AVFormatContext *s, int idx)
Definition:
oggparsecelt.c:33
version
int version
Definition:
avisynth_c.h:629
oggdec.h
AVFormatContext
Format I/O context.
Definition:
avformat.h:1314
ogg_stream::psize
unsigned int psize
Definition:
oggdec.h:66
uint8_t
uint8_t
Definition:
audio_convert.c:194
av_malloc
#define av_malloc(s)
Definition:
tableprint_vlc.h:31
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition:
avcodec.h:1647
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition:
avformat.h:1382
ogg_stream
Definition:
oggdec.h:61
AVERROR
#define AVERROR(e)
Definition:
error.h:43
ff_vorbis_stream_comment
int ff_vorbis_stream_comment(AVFormatContext *as, AVStream *st, const uint8_t *buf, int size)
Definition:
oggparsevorbis.c:74
AVMEDIA_TYPE_AUDIO
Definition:
avutil.h:194
internal.h
AVStream::codec
AVCodecContext * codec
Codec context associated with this stream.
Definition:
avformat.h:896
oggcelt_private
Definition:
oggparsecelt.c:29
intreadwrite.h
ogg_stream::pstart
unsigned int pstart
Definition:
oggdec.h:65
ogg::streams
struct ogg_stream * streams
Definition:
oggdec.h:102
ff_celt_codec
const struct ogg_codec ff_celt_codec
Definition:
oggparsecelt.c:85
AVStream
Stream structure.
Definition:
avformat.h:877
sample_rate
sample_rate
Definition:
ffmpeg_filter.c:190
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition:
avcodec.h:1540
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition:
avcodec.h:1549
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition:
avcodec.h:2287
ff_alloc_extradata
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:2979
ogg_stream::private
void * private
Definition:
oggdec.h:90
ogg_codec::magic
const int8_t * magic
Definition:
oggdec.h:32
ogg_stream::buf
uint8_t * buf
Definition:
oggdec.h:62
avformat.h
Main libavformat public API header.
av_free
#define av_free(p)
Definition:
tableprint_vlc.h:34
ogg
Definition:
oggdec.h:101
AVCodecContext::channels
int channels
number of audio channels
Definition:
avcodec.h:2288
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition:
avformat.h:1342
AV_CODEC_ID_CELT
Definition:
avcodec.h:473
ogg_codec::magicsize
uint8_t magicsize
Definition:
oggdec.h:33
nb_channels
int nb_channels
Definition:
channel_layout.c:76
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition:
bytestream.h:87
AV_WL32
#define AV_WL32(p, v)
Definition:
intreadwrite.h:426
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