/*

 * QOA demuxer

 *

 * 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 "avformat.h"

#include "avio_internal.h"

#include "demux.h"

#include "internal.h"

#include "libavutil/intreadwrite.h"

static int qoa_probe(const AVProbeData *p)

{

    if ((p->buf_size < 16) ||

        (AV_RB32(p->buf) != MKBETAG('q','o','a','f')) ||

        (AV_RB32(p->buf + 4) == 0) ||

        (p->buf[8] == 0) ||

        (AV_RB24(p->buf + 9) == 0) ||

        (AV_RB16(p->buf + 12) == 0) ||

        (AV_RB16(p->buf + 14) == 0))

        return 0;

    return AVPROBE_SCORE_MAX;

}

static int qoa_read_header(AVFormatContext *s)

{

    AVIOContext *pb = s->pb;

    AVStream *st;

    int ret;

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    avio_skip(pb, 4);

    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

    st->codecpar->codec_id = AV_CODEC_ID_QOA;

    st->duration = avio_rb32(pb);

    st->start_time = 0;

    ret = ffio_ensure_seekback(pb, 4);

    if (ret < 0)

        return ret;

    st->codecpar->ch_layout.nb_channels = avio_r8(pb);

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

        return AVERROR_INVALIDDATA;

    st->codecpar->sample_rate = avio_rb24(pb);

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

        return AVERROR_INVALIDDATA;

    avio_seek(pb, -4, SEEK_CUR);

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

    return 0;

}

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

{

    AVIOContext *pb = s->pb;

    uint16_t size, duration;

    uint8_t hdr[8];

    int64_t pos;

    int ret;

    if (avio_feof(pb))

        return AVERROR_EOF;

    pos = avio_tell(pb);

    ret = avio_read(pb, hdr, sizeof(hdr));

    if (ret != sizeof(hdr))

        return AVERROR_EOF;

    duration = AV_RB16(hdr + 4);

    size = AV_RB16(hdr + 6);

    if ((ret = av_new_packet(pkt, size)) < 0)

        return ret;

    memcpy(pkt->data, hdr, sizeof(hdr));

    ret = ffio_read_size(pb, pkt->data + sizeof(hdr), size - sizeof(hdr));

    if (ret < 0)

        return ret;

    pkt->stream_index = 0;

    pkt->pos = pos;

    pkt->duration = duration;

    return 0;

}

const FFInputFormat ff_qoa_demuxer = {

    .p.name         = "qoa",

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

    .p.flags        = AVFMT_GENERIC_INDEX,

    .p.extensions   = "qoa",

    .read_probe     = qoa_probe,

    .read_header    = qoa_read_header,

    .read_packet    = qoa_read_packet,

};