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/*

 * RSD demuxer

 * Copyright (c) 2013 James Almer

 *

 * 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 "libavcodec/bytestream.h"

#include "libavutil/intreadwrite.h"

#include "avformat.h"

#include "avio.h"

#include "internal.h"

static const AVCodecTag rsd_tags[] = {

    { AV_CODEC_ID_ADPCM_THP,       MKTAG('G','A','D','P') },

    { AV_CODEC_ID_ADPCM_IMA_RAD,   MKTAG('R','A','D','P') },

    { AV_CODEC_ID_PCM_S16BE,       MKTAG('P','C','M','B') },

    { AV_CODEC_ID_PCM_S16LE,       MKTAG('P','C','M',' ') },

    { AV_CODEC_ID_NONE, 0 },

};

static const uint32_t rsd_unsupported_tags[] = {

    MKTAG('O','G','G',' '),

    MKTAG('V','A','G',' '),

    MKTAG('W','A','D','P'),

    MKTAG('X','A','D','P'),

    MKTAG('X','M','A',' '),

};

static int rsd_probe(AVProbeData *p)

{

    if (!memcmp(p->buf, "RSD", 3) &&

        p->buf[3] - '0' >= 2 && p->buf[3] - '0' <= 6)

        return AVPROBE_SCORE_EXTENSION;

    return 0;

}

static int rsd_read_header(AVFormatContext *s)

{

    AVIOContext *pb = s->pb;

    int i, version, start = 0x800;

    AVCodecContext *codec;

    AVStream *st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    avio_skip(pb, 3); // "RSD"

    version = avio_r8(pb) - '0';

    codec = st->codec;

    codec->codec_type = AVMEDIA_TYPE_AUDIO;

    codec->codec_tag  = avio_rl32(pb);

    codec->codec_id   = ff_codec_get_id(rsd_tags, codec->codec_tag);

    if (!codec->codec_id) {

        char tag_buf[5];

        av_get_codec_tag_string(tag_buf, sizeof(tag_buf), codec->codec_tag);

        for (i=0; i < FF_ARRAY_ELEMS(rsd_unsupported_tags); i++) {

            if (codec->codec_tag == rsd_unsupported_tags[i]) {

                avpriv_request_sample(s, "Codec tag: %s", tag_buf);

                return AVERROR_PATCHWELCOME;

            }

        }

        av_log(s, AV_LOG_ERROR, "Unknown codec tag: %s\n", tag_buf);

        return AVERROR_INVALIDDATA;

    }

    codec->channels = avio_rl32(pb);

    if (!codec->channels)

        return AVERROR_INVALIDDATA;

    avio_skip(pb, 4); // Bit depth

    codec->sample_rate = avio_rl32(pb);

    if (!codec->sample_rate)

        return AVERROR_INVALIDDATA;

    avio_skip(pb, 4); // Unknown

    switch (codec->codec_id) {

    case AV_CODEC_ID_ADPCM_IMA_RAD:

        codec->block_align = 20 * codec->channels;

        if (pb->seekable)

            st->duration = av_get_audio_frame_duration(codec, avio_size(pb) - start);

        break;

    case AV_CODEC_ID_ADPCM_THP:

        /* RSD3GADP is mono, so only alloc enough memory

           to store the coeff table for a single channel. */

        if (ff_alloc_extradata(codec, 32))

            return AVERROR(ENOMEM);

        start = avio_rl32(pb);

        if (avio_read(s->pb, codec->extradata, 32) != 32)

            return AVERROR_INVALIDDATA;

        for (i = 0; i < 16; i++)

            AV_WB16(codec->extradata + i * 2, AV_RL16(codec->extradata + i * 2));

        if (pb->seekable)

            st->duration = (avio_size(pb) - start) / 8 * 14;

        break;

    case AV_CODEC_ID_PCM_S16LE:

    case AV_CODEC_ID_PCM_S16BE:

        if (version != 4)

            start = avio_rl32(pb);

        if (pb->seekable)

            st->duration = (avio_size(pb) - start) / 2 / codec->channels;

        break;

    }

    avio_skip(pb, start - avio_tell(pb));

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

    return 0;

}

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

{

    AVCodecContext *codec = s->streams[0]->codec;

    int ret, size = 1024;

    if (url_feof(s->pb))

        return AVERROR_EOF;

    if (codec->codec_id == AV_CODEC_ID_ADPCM_IMA_RAD)

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

    else

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

    if (ret != size) {

        if (ret < 0) {

            av_free_packet(pkt);

            return ret;

        }

        av_shrink_packet(pkt, ret);

    }

    pkt->stream_index = 0;

    return ret;

}

AVInputFormat ff_rsd_demuxer = {

    .name           =   "rsd",

    .long_name      =   NULL_IF_CONFIG_SMALL("GameCube RSD"),

    .read_probe     =   rsd_probe,

    .read_header    =   rsd_read_header,

    .read_packet    =   rsd_read_packet,

    .extensions     =   "rsd",

    .codec_tag      =   (const AVCodecTag* const []){rsd_tags, 0},

};