/*

 * Raw DTS-HD 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/intreadwrite.h"

#include "libavutil/dict.h"

#include "libavutil/mem.h"

#include "libavcodec/dca.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

#define AUPR_HDR 0x415550522D484452

#define AUPRINFO 0x41555052494E464F

#define BITSHVTB 0x4249545348565442

#define BLACKOUT 0x424C41434B4F5554

#define BRANCHPT 0x4252414E43485054

#define BUILDVER 0x4255494C44564552

#define CORESSMD 0x434F524553534D44

#define DTSHDHDR 0x4454534844484452

#define EXTSS_MD 0x45585453535f4d44

#define FILEINFO 0x46494C45494E464F

#define NAVI_TBL 0x4E4156492D54424C

#define STRMDATA 0x5354524D44415441

#define TIMECODE 0x54494D45434F4445

typedef struct DTSHDDemuxContext {

    uint64_t    data_end;

} DTSHDDemuxContext;

static int dtshd_probe(const AVProbeData *p)

{

    if (AV_RB64(p->buf) == DTSHDHDR)

        return AVPROBE_SCORE_MAX;

    return 0;

}

static int dtshd_read_header(AVFormatContext *s)

{

    DTSHDDemuxContext *dtshd = s->priv_data;

    AVIOContext *pb = s->pb;

    uint64_t chunk_type, chunk_size;

    int64_t duration, orig_nb_samples, data_start;

    AVStream *st;

    int ret;

    char *value;

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

    st->codecpar->codec_id   = AV_CODEC_ID_DTS;

    ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;

    for (;;) {

        chunk_type = avio_rb64(pb);

        chunk_size = avio_rb64(pb);

        if (avio_feof(pb))

            break;

        if (chunk_size < 4) {

            av_log(s, AV_LOG_ERROR, "chunk size too small\n");

            return AVERROR_INVALIDDATA;

        }

        if (chunk_size > ((uint64_t)1 << 61)) {

            av_log(s, AV_LOG_ERROR, "chunk size too big\n");

            return AVERROR_INVALIDDATA;

        }

        switch (chunk_type) {

        case STRMDATA:

            data_start = avio_tell(pb);

            dtshd->data_end = data_start + chunk_size;

            if (dtshd->data_end <= chunk_size)

                return AVERROR_INVALIDDATA;

            if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))

                goto break_loop;

            goto skip;

            break;

        case AUPR_HDR:

            if (chunk_size < 21)

                return AVERROR_INVALIDDATA;

            avio_skip(pb, 3);

            st->codecpar->sample_rate = avio_rb24(pb);

            if (!st->codecpar->sample_rate)

                return AVERROR_INVALIDDATA;

            duration  = avio_rb32(pb); // num_frames

            duration *= avio_rb16(pb); // samples_per_frames

            st->duration = duration;

            orig_nb_samples  = avio_rb32(pb);

            orig_nb_samples <<= 8;

            orig_nb_samples |= avio_r8(pb);

            st->codecpar->ch_layout.nb_channels = ff_dca_count_chs_for_mask(avio_rb16(pb));

            st->codecpar->initial_padding = avio_rb16(pb);

            st->codecpar->trailing_padding = FFMAX(st->duration - orig_nb_samples - st->codecpar->initial_padding, 0);

            avio_skip(pb, chunk_size - 21);

            break;

        case FILEINFO:

            if (chunk_size > INT_MAX)

                goto skip;

            value = av_malloc(chunk_size);

            if (!value)

                goto skip;

            avio_read(pb, value, chunk_size);

            value[chunk_size - 1] = 0;

            av_dict_set(&s->metadata, "fileinfo", value,

                        AV_DICT_DONT_STRDUP_VAL);

            break;

        default:

skip:

            ret = avio_skip(pb, chunk_size);

            if (ret < 0)

                return ret;

        };

    }

    if (!dtshd->data_end)

        return AVERROR_EOF;

    avio_seek(pb, data_start, SEEK_SET);

break_loop:

    if (st->codecpar->sample_rate)

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

    return 0;

}

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

{

    DTSHDDemuxContext *dtshd = s->priv_data;

    int64_t size, left;

    int ret;

    left = dtshd->data_end - avio_tell(s->pb);

    size = FFMIN(left, 1024);

    if (size <= 0)

        return AVERROR_EOF;

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

    if (ret < 0)

        return ret;

    pkt->stream_index = 0;

    return ret;

}

const FFInputFormat ff_dtshd_demuxer = {

    .p.name         = "dtshd",

    .p.long_name    = NULL_IF_CONFIG_SMALL("raw DTS-HD"),

    .p.flags        = AVFMT_GENERIC_INDEX,

    .p.extensions   = "dtshd",

    .priv_data_size = sizeof(DTSHDDemuxContext),

    .read_probe     = dtshd_probe,

    .read_header    = dtshd_read_header,

    .read_packet    = raw_read_packet,

    .raw_codec_id   = AV_CODEC_ID_DTS,

};