/*

 * Electronic Arts .cdata file Demuxer

 * Copyright (c) 2007 Peter Ross

 *

 * 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

 */

/**

 * @file

 * Electronic Arts cdata Format Demuxer

 * by Peter Ross (pross@xvid.org)

 *

 * Technical details here:

 *  http://wiki.multimedia.cx/index.php?title=EA_Command_And_Conquer_3_Audio_Codec

 */

#include "libavutil/channel_layout.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

#include "libavutil/channel_layout.h"

typedef struct CdataDemuxContext {

  unsigned int channels;

  unsigned int audio_pts;

} CdataDemuxContext;

static int cdata_probe(const AVProbeData *p)

{

    const uint8_t *b = p->buf;

    if (b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C || b[1] == 0x14))

        return AVPROBE_SCORE_MAX/8;

    return 0;

}

static int cdata_read_header(AVFormatContext *s)

{

    CdataDemuxContext *cdata = s->priv_data;

    AVIOContext *pb = s->pb;

    unsigned int sample_rate, header;

    AVStream *st;

    AVChannelLayout channel_layout;

    header = avio_rb16(pb);

    switch (header) {

        case 0x0400:

            channel_layout = (AVChannelLayout){ .nb_channels = 1, .order = AV_CHANNEL_ORDER_UNSPEC };

            break;

        case 0x0404:

            channel_layout  = (AVChannelLayout){ .nb_channels = 2, .order = AV_CHANNEL_ORDER_UNSPEC };

            break;

        case 0x040C:

            channel_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_QUAD;         break;

        case 0x0414:

            channel_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT1_BACK; break;

        default:

            av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header);

            return -1;

    };

    cdata->channels = channel_layout.nb_channels;

    sample_rate = avio_rb16(pb);

    avio_skip(pb, (avio_r8(pb) & 0x20) ? 15 : 11);

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

    st->codecpar->codec_tag = 0; /* no fourcc */

    st->codecpar->codec_id = AV_CODEC_ID_ADPCM_EA_XAS;

    st->codecpar->ch_layout = channel_layout;

    st->codecpar->sample_rate = sample_rate;

    avpriv_set_pts_info(st, 64, 1, sample_rate);

    cdata->audio_pts = 0;

    return 0;

}

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

{

    CdataDemuxContext *cdata = s->priv_data;

    int packet_size = 76*cdata->channels;

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

    if (ret < 0)

        return ret;

    pkt->pts = cdata->audio_pts++;

    return 0;

}

const FFInputFormat ff_ea_cdata_demuxer = {

    .p.name         = "ea_cdata",

    .p.long_name    = NULL_IF_CONFIG_SMALL("Electronic Arts cdata"),

    .p.extensions   = "cdata",

    .priv_data_size = sizeof(CdataDemuxContext),

    .read_probe     = cdata_probe,

    .read_header    = cdata_read_header,

    .read_packet    = cdata_read_packet,

};