/*

 * IRCAM demuxer

 * Copyright (c) 2012 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/intfloat.h"

#include "libavutil/intreadwrite.h"

#include "libavcodec/internal.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

#include "pcm.h"

#include "ircam.h"

static int ircam_probe(const AVProbeData *p)

{

    if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 &&

         p->buf[2] >=    1 && p->buf[2] <= 4) ||

        (p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 &&

         p->buf[1] >=    1 && p->buf[1] <= 3) &&

        AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8))

        return AVPROBE_SCORE_MAX / 4 * 3;

    return 0;

}

static const struct endianness {

    uint32_t magic;

    int      is_le;

} table[] = {

  { 0x64A30100, 0 },

  { 0x64A30200, 1 },

  { 0x64A30300, 0 },

  { 0x64A30400, 1 },

  { 0x0001A364, 1 },

  { 0x0002A364, 0 },

  { 0x0003A364, 1 },

};

static int ircam_read_header(AVFormatContext *s)

{

    uint32_t magic, sample_rate, channels, tag;

    const AVCodecTag *tags;

    int le = -1, i;

    AVStream *st;

    magic = avio_rl32(s->pb);

    for (i = 0; i < 7; i++) {

        if (magic == table[i].magic) {

            le = table[i].is_le;

            break;

        }

    }

    if (le == 1) {

        sample_rate = lrintf(av_int2float(avio_rl32(s->pb)));

        channels    = avio_rl32(s->pb);

        tag         = avio_rl32(s->pb);

        tags        = ff_codec_ircam_le_tags;

    } else if (le == 0) {

        sample_rate = lrintf(av_int2float(avio_rb32(s->pb)));

        channels    = avio_rb32(s->pb);

        tag         = avio_rb32(s->pb);

        tags        = ff_codec_ircam_be_tags;

    } else {

        return AVERROR_INVALIDDATA;

    }

    if (!channels || !sample_rate)

        return AVERROR_INVALIDDATA;

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;

    st->codecpar->ch_layout.nb_channels = channels;

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

        return AVERROR(ENOSYS);

    st->codecpar->sample_rate = sample_rate;

    st->codecpar->codec_id = ff_codec_get_id(tags, tag);

    if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {

        av_log(s, AV_LOG_ERROR, "unknown tag %"PRIx32"\n", tag);

        return AVERROR_INVALIDDATA;

    }

    st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id);

    st->codecpar->block_align = st->codecpar->bits_per_coded_sample *

                                st->codecpar->ch_layout.nb_channels / 8;

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

    avio_skip(s->pb, 1008);

    return 0;

}

const FFInputFormat ff_ircam_demuxer = {

    .p.name         = "ircam",

    .p.long_name    = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"),

    .p.extensions   = "sf,ircam",

    .p.flags        = AVFMT_GENERIC_INDEX,

    .read_probe     = ircam_probe,

    .read_header    = ircam_read_header,

    .read_packet    = ff_pcm_read_packet,

    .read_seek      = ff_pcm_read_seek,

};