/*

 * AFC demuxer

 * Copyright (c) 2012 Paul B Mahol

 *

 * 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 "libavutil/channel_layout.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

typedef struct AFCDemuxContext {

    int64_t    data_end;

} AFCDemuxContext;

static int afc_read_header(AVFormatContext *s)

{

    AFCDemuxContext *c = s->priv_data;

    AVStream *st;

    int ret;

    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_ADPCM_AFC;

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

    if ((ret = ff_alloc_extradata(st->codecpar, 1)) < 0)

        return ret;

    st->codecpar->extradata[0] = 8 * st->codecpar->ch_layout.nb_channels;

    c->data_end = avio_rb32(s->pb) + 32LL;

    st->duration = avio_rb32(s->pb);

    st->codecpar->sample_rate = avio_rb16(s->pb);

    avio_skip(s->pb, 22);

    avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);

    return 0;

}

static int afc_read_packet(AVFormatContext *s, AVPacket *pkt)

{

    AFCDemuxContext *c = s->priv_data;

    int64_t size = c->data_end - avio_tell(s->pb);

    int ret;

    size = FFMIN(size, 18 * 128);

    if (size <= 0)

        return AVERROR_EOF;

    ret = av_get_packet(s->pb, pkt, size);

    pkt->stream_index = 0;

    return ret;

}

const FFInputFormat ff_afc_demuxer = {

    .p.name         = "afc",

    .p.long_name    = NULL_IF_CONFIG_SMALL("AFC"),

    .p.extensions   = "afc",

    .p.flags        = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK,

    .priv_data_size = sizeof(AFCDemuxContext),

    .read_header    = afc_read_header,

    .read_packet    = afc_read_packet,

};