2 * G.729 raw format demuxer
3 * Copyright (c) 2011 Vladimir Voroshilov
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/log.h"
25 #include "libavutil/opt.h"
27 typedef struct G729DemuxerContext
{
32 static int g729_read_header(AVFormatContext
*s
)
35 G729DemuxerContext
*s1
= s
->priv_data
;
37 st
= avformat_new_stream(s
, NULL
);
39 return AVERROR(ENOMEM
);
41 st
->codec
->codec_type
= AVMEDIA_TYPE_AUDIO
;
42 st
->codec
->codec_id
= AV_CODEC_ID_G729
;
43 st
->codec
->sample_rate
= 8000;
44 st
->codec
->channels
= 1;
46 if (s1
&& s1
->bit_rate
) {
47 s
->bit_rate
= s1
->bit_rate
;
50 if (s
->bit_rate
== 0) {
51 av_log(s
, AV_LOG_DEBUG
, "No bitrate specified. Assuming 8000 b/s\n");
55 if (s
->bit_rate
== 6400) {
56 st
->codec
->block_align
= 8;
57 } else if (s
->bit_rate
== 8000) {
58 st
->codec
->block_align
= 10;
60 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
);
61 return AVERROR_INVALIDDATA
;
64 avpriv_set_pts_info(st
, st
->codec
->block_align
<< 3, 1, st
->codec
->sample_rate
);
67 static int g729_read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
71 ret
= av_get_packet(s
->pb
, pkt
, s
->streams
[0]->codec
->block_align
);
73 pkt
->stream_index
= 0;
77 pkt
->dts
= pkt
->pts
= pkt
->pos
/ s
->streams
[0]->codec
->block_align
;
82 static const AVOption g729_options
[] = {
83 { "bit_rate", "", offsetof(G729DemuxerContext
, bit_rate
), AV_OPT_TYPE_INT
, {.i64
= 0}, 0, INT_MAX
, AV_OPT_FLAG_DECODING_PARAM
},
87 static const AVClass g729_demuxer_class
= {
88 .class_name
= "g729 demuxer",
89 .item_name
= av_default_item_name
,
90 .option
= g729_options
,
91 .version
= LIBAVUTIL_VERSION_INT
,
94 AVInputFormat ff_g729_demuxer
= {
96 .long_name
= NULL_IF_CONFIG_SMALL("G.729 raw format demuxer"),
97 .priv_data_size
= sizeof(G729DemuxerContext
),
98 .read_header
= g729_read_header
,
99 .read_packet
= g729_read_packet
,
100 .flags
= AVFMT_GENERIC_INDEX
,
101 .extensions
= "g729",
102 .priv_class
= &g729_demuxer_class
,