/*

 * FWSE demuxer

 * Copyright (c) 2020 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 "libavutil/intreadwrite.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

#include "pcm.h"

static int fwse_probe(const AVProbeData *p)

{

    if (AV_RL32(p->buf) != MKTAG('F','W','S','E'))

        return 0;

    if (AV_RL32(p->buf+4) != 2 && AV_RL32(p->buf+4) != 3)

        return 0;

    if (AV_RL32(p->buf+16) != 1 && AV_RL32(p->buf+16) != 2)

        return 0;

    return AVPROBE_SCORE_MAX / 4 * 3;

}

static int fwse_read_header(AVFormatContext *s)

{

    unsigned start_offset, version;

    int channels;

    AVIOContext *pb = s->pb;

    AVCodecParameters *par;

    AVStream *st;

    avio_skip(pb, 4);

    version = avio_rl32(pb);

    if (version != 2 && version != 3)

        return AVERROR_INVALIDDATA;

    avio_skip(pb, 4);

    start_offset = avio_rl32(pb);

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    par              = st->codecpar;

    par->codec_type  = AVMEDIA_TYPE_AUDIO;

    par->codec_id    = AV_CODEC_ID_ADPCM_IMA_MTF;

    par->format      = AV_SAMPLE_FMT_S16;

    channels         = avio_rl32(pb);

    if (channels != 1 && channels != 2)

        return AVERROR_INVALIDDATA;

    av_channel_layout_default(&par->ch_layout, channels);

    st->duration = avio_rl32(pb);

    par->sample_rate = avio_rl32(pb);

    if (par->sample_rate <= 0)

        return AVERROR_INVALIDDATA;

    par->block_align = 1;

    avio_skip(pb, start_offset - avio_tell(pb));

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

    return 0;

}

const FFInputFormat ff_fwse_demuxer = {

    .p.name         = "fwse",

    .p.long_name    = NULL_IF_CONFIG_SMALL("Capcom's MT Framework sound"),

    .p.extensions   = "fwse",

    .read_probe     = fwse_probe,

    .read_header    = fwse_read_header,

    .read_packet    = ff_pcm_read_packet,

};