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libavformat
g722.c
Go to the documentation of this file.
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/*
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* g722 raw demuxer
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* Copyright (c) 2010 Martin Storsjo
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "
avformat.h
"
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#include "
internal.h
"
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#include "
rawdec.h
"
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static
int
g722_read_header
(
AVFormatContext
*s)
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{
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AVStream
*st;
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st =
avformat_new_stream
(s,
NULL
);
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if
(!st)
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return
AVERROR
(ENOMEM);
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st->
codec
->
codec_type
=
AVMEDIA_TYPE_AUDIO
;
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st->
codec
->
codec_id
=
AV_CODEC_ID_ADPCM_G722
;
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st->
codec
->
sample_rate
= 16000;
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st->
codec
->
channels
= 1;
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st->
codec
->
bits_per_coded_sample
=
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av_get_bits_per_sample
(st->
codec
->
codec_id
);
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assert(st->
codec
->
bits_per_coded_sample
> 0);
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avpriv_set_pts_info
(st, 64, 1, st->
codec
->
sample_rate
);
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return
0;
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}
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AVInputFormat
ff_g722_demuxer
= {
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.
name
=
"g722"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"raw G.722"
),
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.read_header =
g722_read_header
,
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.read_packet =
ff_raw_read_partial_packet
,
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.flags =
AVFMT_GENERIC_INDEX
,
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.extensions =
"g722,722"
,
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.raw_codec_id =
AV_CODEC_ID_ADPCM_G722
,
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};
g722_read_header
static int g722_read_header(AVFormatContext *s)
Definition:
g722.c:26
ff_g722_demuxer
AVInputFormat ff_g722_demuxer
Definition:
g722.c:48
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:2829
AVInputFormat
Definition:
avformat.h:520
AV_CODEC_ID_ADPCM_G722
Definition:
avcodec.h:359
AVFormatContext
Format I/O context.
Definition:
avformat.h:922
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition:
utils.c:2521
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition:
avcodec.h:2523
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition:
utils.c:2055
AVERROR
#define AVERROR(e)
Definition:
error.h:43
ff_raw_read_partial_packet
int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
Definition:
rawdec.c:34
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition:
internal.h:145
AVMEDIA_TYPE_AUDIO
Definition:
avutil.h:188
internal.h
AVStream::codec
AVCodecContext * codec
Codec context associated with this stream.
Definition:
avformat.h:718
AVStream
Stream structure.
Definition:
avformat.h:699
NULL
NULL
Definition:
eval.c:55
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition:
avcodec.h:1058
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition:
avcodec.h:1067
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition:
avcodec.h:1807
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition:
avformat.h:417
avformat.h
Main libavformat public API header.
rawdec.h
AVCodecContext::channels
int channels
number of audio channels
Definition:
avcodec.h:1808
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition:
avformat.h:525
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