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/*
* G.723.1 demuxer
* Copyright (c) 2010 Mohamed Naufal Basheer
*
* 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
*/
/**
* @file
* G.723.1 demuxer
*/
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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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|
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static const uint8_t frame_size[4] = { 24, 20, 4, 1 }; |
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|
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static av_cold int g723_1_init(AVFormatContext *s) |
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{
AVStream *st;
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st = avformat_new_stream(s, NULL); |
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if (!st)
return AVERROR(ENOMEM);
|
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_G723_1;
st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
st->codecpar->channels = 1;
st->codecpar->sample_rate = 8000; |
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|
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
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st->start_time = 0; |
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return 0;
}
static int g723_1_read_packet(AVFormatContext *s, AVPacket *pkt)
{
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];
ret = av_new_packet(pkt, size);
if (ret < 0)
return ret;
pkt->data[0] = byte;
pkt->duration = 240;
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_packet_unref(pkt); |
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return ret < 0 ? ret : AVERROR_EOF;
}
return pkt->size;
}
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,
.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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}; |