/*

 * Sierra SOL demuxer

 * Copyright Konstantin Shishkov

 *

 * 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

 */

/*

 * Based on documents from Game Audio Player and own research

 */

#include "libavutil/channel_layout.h"

#include "libavutil/intreadwrite.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

#include "pcm.h"

/* if we don't know the size in advance */

#define AU_UNKNOWN_SIZE ((uint32_t)(~0))

static int sol_probe(const AVProbeData *p)

{

    /* check file header */

    uint16_t magic = AV_RL32(p->buf);

    if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&

        p->buf[2] == 'S' && p->buf[3] == 'O' &&

        p->buf[4] == 'L' && p->buf[5] == 0)

        return AVPROBE_SCORE_MAX;

    else

        return 0;

}

#define SOL_DPCM    1

#define SOL_16BIT   4

#define SOL_STEREO 16

static enum AVCodecID sol_codec_id(int magic, int type)

{

    if (type & SOL_DPCM)

        return AV_CODEC_ID_SOL_DPCM;

    if (magic == 0x0B8D)

        return AV_CODEC_ID_PCM_U8;

    if (type & SOL_16BIT)

        return AV_CODEC_ID_PCM_S16LE;

    return AV_CODEC_ID_PCM_U8;

}

static int sol_codec_type(int magic, int type)

{

    if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;

    if (type & SOL_DPCM)

    {

        if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;

        else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;

        else return 2;//SOL_DPCM_NEW8;

    }

    return -1;

}

static int sol_channels(int magic, int type)

{

    if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;

    return 2;

}

static int sol_read_header(AVFormatContext *s)

{

    unsigned int magic,tag;

    AVIOContext *pb = s->pb;

    unsigned int id, channels, rate, type;

    enum AVCodecID codec;

    AVStream *st;

    /* check ".snd" header */

    magic = avio_rl16(pb);

    tag = avio_rl32(pb);

    if (tag != MKTAG('S', 'O', 'L', 0))

        return -1;

    rate = avio_rl16(pb);

    type = avio_r8(pb);

    avio_skip(pb, 4); /* size */

    if (magic != 0x0B8D)

        avio_r8(pb); /* newer SOLs contain padding byte */

    codec = sol_codec_id(magic, type);

    channels = sol_channels(magic, type);

    if (codec == AV_CODEC_ID_SOL_DPCM)

        id = sol_codec_type(magic, type);

    else id = 0;

    /* now we are ready: build format streams */

    st = avformat_new_stream(s, NULL);

    if (!st)

        return -1;

    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

    st->codecpar->codec_tag = id;

    st->codecpar->codec_id = codec;

    av_channel_layout_default(&st->codecpar->ch_layout,channels);

    st->codecpar->sample_rate = rate;

    avpriv_set_pts_info(st, 64, 1, rate);

    return 0;

}

#define MAX_SIZE 4096

static int sol_read_packet(AVFormatContext *s,

                          AVPacket *pkt)

{

    int ret;

    if (avio_feof(s->pb))

        return AVERROR_EOF;

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

    if (ret < 0)

        return ret;

    pkt->flags &= ~AV_PKT_FLAG_CORRUPT;

    pkt->stream_index = 0;

    return 0;

}

const FFInputFormat ff_sol_demuxer = {

    .p.name         = "sol",

    .p.long_name    = NULL_IF_CONFIG_SMALL("Sierra SOL"),

    .read_probe     = sol_probe,

    .read_header    = sol_read_header,

    .read_packet    = sol_read_packet,

    .read_seek      = ff_pcm_read_seek,

};