/*

 * OSQ demuxer

 * Copyright (c) 2023 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/intreadwrite.h"

#include "avio_internal.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

#include "rawdec.h"

static int osq_probe(const AVProbeData *p)

{

    if (AV_RL32(p->buf) != MKTAG('O','S','Q',' '))

        return 0;

    if (AV_RL32(p->buf + 4) != 48)

        return 0;

    if (AV_RL16(p->buf + 8) != 1)

        return 0;

    if (p->buf[10] == 0)

        return 0;

    if (p->buf[11] == 0)

        return 0;

    if (AV_RL32(p->buf + 12) == 0)

        return 0;

    if (AV_RL16(p->buf + 16) == 0)

        return 0;

    return AVPROBE_SCORE_MAX;

}

static int osq_read_header(AVFormatContext *s)

{

    uint32_t t, size;

    AVStream *st;

    int ret;

    t = avio_rl32(s->pb);

    if (t != MKTAG('O','S','Q',' '))

        return AVERROR_INVALIDDATA;

    size = avio_rl32(s->pb);

    if (size != 48)

        return AVERROR_INVALIDDATA;

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0)

        return ret;

    t = avio_rl32(s->pb);

    if (t != MKTAG('R','I','F','F'))

        return AVERROR_INVALIDDATA;

    avio_skip(s->pb, 8);

    t = avio_rl32(s->pb);

    if (t != MKTAG('f','m','t',' '))

        return AVERROR_INVALIDDATA;

    size = avio_rl32(s->pb);

    avio_skip(s->pb, size);

    t = avio_rl32(s->pb);

    size = avio_rl32(s->pb);

    while (t != MKTAG('d','a','t','a')) {

        avio_skip(s->pb, size);

        t = avio_rl32(s->pb);

        size = avio_rl32(s->pb);

        if (avio_feof(s->pb))

            return AVERROR_INVALIDDATA;

    }

    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;

    st->codecpar->codec_id    = AV_CODEC_ID_OSQ;

    st->codecpar->sample_rate = AV_RL32(st->codecpar->extradata + 4);

    if (st->codecpar->sample_rate <= 0)

        return AVERROR_INVALIDDATA;

    st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;

    st->codecpar->ch_layout.nb_channels = st->codecpar->extradata[3];

    if (st->codecpar->ch_layout.nb_channels == 0)

        return AVERROR_INVALIDDATA;

    st->start_time = 0;

    st->duration = AV_RL32(st->codecpar->extradata + 16);

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

    return 0;

}

const FFInputFormat ff_osq_demuxer = {

    .p.name         = "osq",

    .p.long_name    = NULL_IF_CONFIG_SMALL("raw OSQ"),

    .p.extensions   = "osq",

    .p.flags        = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,

    .p.priv_class   = &ff_raw_demuxer_class,

    .read_probe     = osq_probe,

    .read_header    = osq_read_header,

    .read_packet    = ff_raw_read_partial_packet,

    .raw_codec_id   = AV_CODEC_ID_OSQ,

    .priv_data_size = sizeof(FFRawDemuxerContext),

};