mirror of https://git.ffmpeg.org/ffmpeg.git
103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
|
/*
|
||
|
|
* G.729 raw format demuxer
|
||
|
|
* Copyright (c) 2011 Vladimir Voroshilov
|
||
|
|
*
|
||
|
|
* This file is part of FFmpeg.
|
||
|
|
*
|
||
|
|
* FFmpeg is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with FFmpeg; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "avformat.h"
|
||
|
|
#include "libavutil/log.h"
|
||
|
|
#include "libavutil/opt.h"
|
||
|
|
|
||
|
|
typedef struct G729DemuxerContext {
|
||
|
|
AVClass *class;
|
||
|
|
int bit_rate;
|
||
|
|
} G729DemuxerContext;
|
||
|
|
|
||
|
|
static int g729_read_header(AVFormatContext *s, AVFormatParameters *ap)
|
||
|
|
{
|
||
|
|
AVStream* st;
|
||
|
|
G729DemuxerContext *s1 = s->priv_data;
|
||
|
|
|
||
|
|
st = avformat_new_stream(s, NULL);
|
||
|
|
if (!st)
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
|
||
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
||
|
|
st->codec->codec_id = CODEC_ID_G729;
|
||
|
|
st->codec->sample_rate = 8000;
|
||
|
|
st->codec->channels = 1;
|
||
|
|
|
||
|
|
if (s1 && s1->bit_rate) {
|
||
|
|
s->bit_rate = s1->bit_rate;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (s->bit_rate == 0) {
|
||
|
|
av_log(s, AV_LOG_DEBUG, "No bitrate specified. Assuming 8000 b/s\n");
|
||
|
|
s->bit_rate = 8000;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (s->bit_rate == 6400) {
|
||
|
|
st->codec->block_align = 8;
|
||
|
|
} else if (s->bit_rate == 8000) {
|
||
|
|
st->codec->block_align = 10;
|
||
|
|
} else {
|
||
|
|
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);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
av_set_pts_info(st, st->codec->block_align << 3, 1, st->codec->sample_rate);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
static int g729_read_packet(AVFormatContext *s, AVPacket *pkt)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align);
|
||
|
|
|
||
|
|
pkt->stream_index = 0;
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
pkt->dts = pkt->pts = pkt->pos / s->streams[0]->codec->block_align;
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const AVOption g729_options[] = {
|
||
|
|
{ "bit_rate", "", offsetof(G729DemuxerContext, bit_rate), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
|
||
|
|
{ NULL },
|
||
|
|
};
|
||
|
|
|
||
|
|
static const AVClass g729_demuxer_class = {
|
||
|
|
.class_name = "g729 demuxer",
|
||
|
|
.item_name = av_default_item_name,
|
||
|
|
.option = g729_options,
|
||
|
|
.version = LIBAVUTIL_VERSION_INT,
|
||
|
|
};
|
||
|
|
|
||
|
|
AVInputFormat ff_g729_demuxer = {
|
||
|
|
.name = "g729",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("G.729 raw format demuxer"),
|
||
|
|
.priv_data_size = sizeof(G729DemuxerContext),
|
||
|
|
.read_header = g729_read_header,
|
||
|
|
.read_packet = g729_read_packet,
|
||
|
|
.flags = AVFMT_GENERIC_INDEX,
|
||
|
|
.extensions = "g729",
|
||
|
|
.priv_class = &g729_demuxer_class,
|
||
|
|
};
|