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libavformat
g729dec.c
Go to the documentation of this file.
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/*
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* G.729 raw format demuxer
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* Copyright (c) 2011 Vladimir Voroshilov
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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 "
avformat.h
"
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#include "
internal.h
"
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#include "
libavutil/log.h
"
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#include "
libavutil/opt.h
"
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typedef
struct
G729DemuxerContext
{
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AVClass
*
class
;
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int
bit_rate
;
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}
G729DemuxerContext
;
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static
int
g729_read_header
(
AVFormatContext
*s)
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{
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AVStream
* st;
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G729DemuxerContext
*
s1
= s->
priv_data
;
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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_G729
;
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st->
codec
->
sample_rate
= 8000;
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st->
codec
->
channels
= 1;
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if
(s1 && s1->
bit_rate
) {
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s->
bit_rate
= s1->
bit_rate
;
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}
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if
(s->
bit_rate
== 0) {
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av_log
(s,
AV_LOG_DEBUG
,
"No bitrate specified. Assuming 8000 b/s\n"
);
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s->
bit_rate
= 8000;
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}
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if
(s->
bit_rate
== 6400) {
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st->
codec
->
block_align
= 8;
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}
else
if
(s->
bit_rate
== 8000) {
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st->
codec
->
block_align
= 10;
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}
else
{
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av_log
(s,
AV_LOG_ERROR
,
"Only 8000 b/s and 6400 b/s bitrates are supported. Provided: %d b/s\n"
, s->
bit_rate
);
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return
AVERROR_INVALIDDATA
;
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}
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avpriv_set_pts_info
(st, st->
codec
->
block_align
<< 3, 1, st->
codec
->
sample_rate
);
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return
0;
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}
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static
int
g729_read_packet
(
AVFormatContext
*s,
AVPacket
*
pkt
)
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{
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int
ret;
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ret =
av_get_packet
(s->
pb
, pkt, s->
streams
[0]->
codec
->
block_align
);
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pkt->
stream_index
= 0;
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if
(ret < 0)
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return
ret;
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pkt->
dts
= pkt->
pts
= pkt->
pos
/ s->
streams
[0]->
codec
->
block_align
;
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return
ret;
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}
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static
const
AVOption
g729_options
[] = {
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{
"bit_rate"
,
""
, offsetof(
G729DemuxerContext
, bit_rate),
AV_OPT_TYPE_INT
, {.i64 = 0}, 0, INT_MAX,
AV_OPT_FLAG_DECODING_PARAM
},
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{
NULL
},
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};
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static
const
AVClass
g729_demuxer_class
= {
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.
class_name
=
"g729 demuxer"
,
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.item_name =
av_default_item_name
,
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.option =
g729_options
,
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.version =
LIBAVUTIL_VERSION_INT
,
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};
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AVInputFormat
ff_g729_demuxer
= {
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.
name
=
"g729"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"G.729 raw format demuxer"
),
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.priv_data_size =
sizeof
(
G729DemuxerContext
),
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.
read_header
=
g729_read_header
,
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.
read_packet
=
g729_read_packet
,
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.
flags
=
AVFMT_GENERIC_INDEX
,
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.extensions =
"g729"
,
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.priv_class = &g729_demuxer_class,
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};
Generated on Sat May 25 2013 04:01:04 for FFmpeg by
1.8.2