/*

 * Black ops audio demuxer

 * Copyright (c) 2013 Michael Niedermayer

 *

 * 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 "libavcodec/internal.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

static int probe(const AVProbeData *p)

{

    if (p->buf_size < 2096)

        return 0;

    if (   AV_RL32(p->buf     ) != 1

        || AV_RL32(p->buf +  8) > 100000

        || AV_RL32(p->buf + 12) > 8

        || AV_RL32(p->buf + 16) != 2096

        ||!AV_RL32(p->buf + 21)

        || AV_RL16(p->buf + 25) != 2096

        || AV_RL32(p->buf + 48) % AV_RL32(p->buf + 21)

        )

        return 0;

    return AVPROBE_SCORE_EXTENSION;

}

static int read_header(AVFormatContext *s)

{

    AVStream *st = avformat_new_stream(s, NULL);

    uint32_t data_offset;

    if (!st)

        return AVERROR(ENOMEM);

    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

    st->codecpar->codec_id = AV_CODEC_ID_ADPCM_MS;

    avio_rl32(s->pb);

    avio_rl32(s->pb);

    st->codecpar->sample_rate = avio_rl32(s->pb);

    st->codecpar->ch_layout.nb_channels    = avio_rl32(s->pb);

    if (st->codecpar->ch_layout.nb_channels > FF_SANE_NB_CHANNELS ||

        st->codecpar->ch_layout.nb_channels <= 0)

        return AVERROR(ENOSYS);

    ffformatcontext(s)->data_offset = data_offset = avio_rl32(s->pb);

    avio_r8(s->pb);

    st->codecpar->block_align = avio_rl32(s->pb);

    if (st->codecpar->block_align > INT_MAX / FF_SANE_NB_CHANNELS || st->codecpar->block_align <= 0)

        return AVERROR_INVALIDDATA;

    st->codecpar->block_align *= st->codecpar->ch_layout.nb_channels;

    avio_seek(s->pb, data_offset, SEEK_SET);

    return 0;

}

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

{

    AVStream *st = s->streams[0];

    return av_get_packet(s->pb, pkt, st->codecpar->block_align);

}

const FFInputFormat ff_boa_demuxer = {

    .p.name         = "boa",

    .p.long_name    = NULL_IF_CONFIG_SMALL("Black Ops Audio"),

    .p.flags        = AVFMT_GENERIC_INDEX,

    .read_probe     = probe,

    .read_header    = read_header,

    .read_packet    = read_packet,

};