/*

 * MSF demuxer

 * Copyright (c) 2015 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 "avformat.h"

#include "demux.h"

#include "internal.h"

static int msf_probe(const AVProbeData *p)

{

    if (memcmp(p->buf, "MSF", 3))

        return 0;

    if (AV_RB32(p->buf+8) <= 0)

        return 0;

    if (AV_RB32(p->buf+16) <= 0)

        return 0;

    if (AV_RB32(p->buf+4) > 16)

        return AVPROBE_SCORE_MAX / 5; //unsupported / unknown codec

    return AVPROBE_SCORE_MAX / 3 * 2;

}

static int msf_read_header(AVFormatContext *s)

{

    unsigned codec, size;

    AVStream *st;

    int ret;

    avio_skip(s->pb, 4);

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;

    codec                  = avio_rb32(s->pb);

    st->codecpar->ch_layout.nb_channels = avio_rb32(s->pb);

    if (st->codecpar->ch_layout.nb_channels <= 0 ||

        st->codecpar->ch_layout.nb_channels >= INT_MAX / 1024)

        return AVERROR_INVALIDDATA;

    size = avio_rb32(s->pb);

    st->codecpar->sample_rate = avio_rb32(s->pb);

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

        return AVERROR_INVALIDDATA;

    // avio_rb32(s->pb); /* byte flags with encoder info */

    switch (codec) {

    case 0: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE; break;

    case 1: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; break;

    case 3: st->codecpar->block_align = 16 * st->codecpar->ch_layout.nb_channels;

            st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; break;

    case 4:

    case 5:

    case 6: st->codecpar->block_align = (codec == 4 ? 96 : codec == 5 ? 152 : 192) * st->codecpar->ch_layout.nb_channels;

            if (st->codecpar->ch_layout.nb_channels > UINT16_MAX / 2048)

                return AVERROR_INVALIDDATA;

            ret = ff_alloc_extradata(st->codecpar, 14);

            if (ret < 0)

                return ret;

            memset(st->codecpar->extradata, 0, st->codecpar->extradata_size);

            AV_WL16(st->codecpar->extradata, 1); /* version */

            AV_WL16(st->codecpar->extradata+2, 2048 * st->codecpar->ch_layout.nb_channels); /* unknown size */

            AV_WL16(st->codecpar->extradata+6, codec == 4 ? 1 : 0); /* joint stereo */

            AV_WL16(st->codecpar->extradata+8, codec == 4 ? 1 : 0); /* joint stereo (repeat?) */

            AV_WL16(st->codecpar->extradata+10, 1);

            st->codecpar->codec_id = AV_CODEC_ID_ATRAC3;    break;

    case 7: ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;

            st->codecpar->codec_id = AV_CODEC_ID_MP3;       break;

    default:

            avpriv_request_sample(s, "Codec %d", codec);

            return AVERROR_PATCHWELCOME;

    }

    st->duration = av_get_audio_frame_duration2(st->codecpar, size);

    avio_skip(s->pb, 0x40 - avio_tell(s->pb));

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

    return 0;

}

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

{

    AVCodecParameters *par = s->streams[0]->codecpar;

    return av_get_packet(s->pb, pkt, par->block_align ? par->block_align : 1024 * par->ch_layout.nb_channels);

}

const FFInputFormat ff_msf_demuxer = {

    .p.name         = "msf",

    .p.long_name    = NULL_IF_CONFIG_SMALL("Sony PS3 MSF"),

    .p.extensions   = "msf",

    .read_probe     = msf_probe,

    .read_header    = msf_read_header,

    .read_packet    = msf_read_packet,

};