mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/*
|
|
* G.723.1 demuxer
|
|
* Copyright (c) 2010 Mohamed Naufal Basheer
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* G.723.1 demuxer
|
|
*/
|
|
|
|
#include "libavutil/attributes.h"
|
|
#include "libavutil/channel_layout.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
static const uint8_t frame_size[4] = { 24, 20, 4, 1 };
|
|
|
|
static av_cold int g723_1_init(AVFormatContext *s)
|
|
{
|
|
AVStream *st;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id = AV_CODEC_ID_G723_1;
|
|
st->codec->channel_layout = AV_CH_LAYOUT_MONO;
|
|
st->codec->channels = 1;
|
|
st->codec->sample_rate = 8000;
|
|
|
|
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
|
|
st->start_time = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int g723_1_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int size, byte, ret;
|
|
|
|
pkt->pos = avio_tell(s->pb);
|
|
byte = avio_r8(s->pb);
|
|
size = frame_size[byte & 3];
|
|
|
|
ret = av_new_packet(pkt, size);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
pkt->data[0] = byte;
|
|
pkt->duration = 240;
|
|
pkt->stream_index = 0;
|
|
|
|
ret = avio_read(s->pb, pkt->data + 1, size - 1);
|
|
if (ret < size - 1) {
|
|
av_free_packet(pkt);
|
|
return ret < 0 ? ret : AVERROR_EOF;
|
|
}
|
|
|
|
return pkt->size;
|
|
}
|
|
|
|
AVInputFormat ff_g723_1_demuxer = {
|
|
.name = "g723_1",
|
|
.long_name = NULL_IF_CONFIG_SMALL("G.723.1"),
|
|
.read_header = g723_1_init,
|
|
.read_packet = g723_1_read_packet,
|
|
.extensions = "tco",
|
|
.flags = AVFMT_GENERIC_INDEX
|
|
};
|