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libavformat
g723_1.c
Go to the documentation of this file.
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/*
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* G.723.1 demuxer
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* Copyright (c) 2010 Mohamed Naufal Basheer
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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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/**
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* @file
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* G.723.1 demuxer
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*/
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#include "
libavutil/attributes.h
"
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#include "
libavutil/channel_layout.h
"
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#include "
avformat.h
"
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#include "
internal.h
"
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static
const
uint8_t
frame_size
[4] = { 24, 20, 4, 1 };
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static
av_cold
int
g723_1_init
(
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_G723_1
;
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st->
codec
->
channel_layout
=
AV_CH_LAYOUT_MONO
;
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st->
codec
->
channels
= 1;
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st->
codec
->
sample_rate
= 8000;
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avpriv_set_pts_info
(st, 64, 1, st->
codec
->
sample_rate
);
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st->
start_time
= 0;
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return
0;
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}
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static
int
g723_1_read_packet
(
AVFormatContext
*
s
,
AVPacket
*
pkt
)
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{
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int
size
,
byte
,
ret
;
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pkt->
pos
=
avio_tell
(s->
pb
);
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byte =
avio_r8
(s->
pb
);
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size =
frame_size
[byte & 3];
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ret =
av_new_packet
(pkt, size);
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if
(ret < 0)
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return
ret
;
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pkt->
data
[0] =
byte
;
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pkt->
duration
= 240;
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pkt->
stream_index
= 0;
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ret =
avio_read
(s->
pb
, pkt->
data
+ 1, size - 1);
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if
(ret < size - 1) {
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av_free_packet
(pkt);
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return
ret < 0 ? ret :
AVERROR_EOF
;
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}
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return
pkt->
size
;
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}
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AVInputFormat
ff_g723_1_demuxer
= {
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.
name
=
"g723_1"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"G.723.1"
),
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.read_header =
g723_1_init
,
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.read_packet =
g723_1_read_packet
,
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.extensions =
"tco,rco,g723_1"
,
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.flags =
AVFMT_GENERIC_INDEX
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};
Generated on Wed Jul 10 2013 23:47:58 for FFmpeg by
1.8.2