/*

 * 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

 */

#include "libavutil/attributes.h"

#include "libavutil/channel_layout.h"

#include "avformat.h"

#include "demux.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->codecpar->codec_type     = AVMEDIA_TYPE_AUDIO;

    st->codecpar->codec_id       = AV_CODEC_ID_G723_1;

    st->codecpar->ch_layout      = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

    st->codecpar->sample_rate    = 8000;

    avpriv_set_pts_info(st, 64, 1, st->codecpar->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) {

        return ret < 0 ? ret : AVERROR_EOF;

    }

    return pkt->size;

}

const FFInputFormat ff_g723_1_demuxer = {

    .p.name         = "g723_1",

    .p.long_name    = NULL_IF_CONFIG_SMALL("G.723.1"),

    .p.extensions   = "tco,rco,g723_1",

    .p.flags        = AVFMT_GENERIC_INDEX,

    .read_header = g723_1_init,

    .read_packet = g723_1_read_packet,

};