/*

 * Copyright (C) 2010 David Conrad

 *

 * 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 "avformat.h"

#include "internal.h"

#include "oggdec.h"

static int skeleton_header(AVFormatContext *s, int idx)

{

    struct ogg *ogg = s->priv_data;

    struct ogg_stream *os = ogg->streams + idx;

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

    uint8_t *buf = os->buf + os->pstart;

    int version_major, version_minor;

    int64_t start_num, start_den;

    uint64_t start_granule;

    int target_idx, start_time;

    st->codecpar->codec_type = AVMEDIA_TYPE_DATA;

    if ((os->flags & OGG_FLAG_EOS) && os->psize == 0)

        return 1;

    if (os->psize < 8)

        return -1;

    if (!strncmp(buf, "fishead", 8)) {

        if (os->psize < 64)

            return -1;

        version_major = AV_RL16(buf+8);

        version_minor = AV_RL16(buf+10);

        if (version_major != 3 && version_major != 4) {

            av_log(s, AV_LOG_WARNING, "Unknown skeleton version %d.%d\n",

                   version_major, version_minor);

            return -1;

        }

        // This is the overall start time. We use it for the start time of

        // of the skeleton stream since if left unset lavf assumes 0,

        // which we don't want since skeleton is timeless

        // FIXME: the real meaning of this field is "start playback at

        // this time which can be in the middle of a packet

        start_num = AV_RL64(buf+12);

        start_den = AV_RL64(buf+20);

        if (start_den > 0 && start_num > 0) {

            int base_den;

            av_reduce(&start_time, &base_den, start_num, start_den, INT_MAX);

            avpriv_set_pts_info(st, 64, 1, base_den);

            os->lastpts =

            st->start_time = start_time;

        }

    } else if (!strncmp(buf, "fisbone", 8)) {

        if (os->psize < 52)

            return -1;

        target_idx = ogg_find_stream(ogg, AV_RL32(buf+12));

        start_granule = AV_RL64(buf+36);

        if (target_idx < 0) {

            av_log(s, AV_LOG_WARNING, "Serial number in fisbone doesn't match any stream\n");

            return 1;

        }

        os = ogg->streams + target_idx;

        if (os->start_granule != OGG_NOGRANULE_VALUE) {

            av_log(s, AV_LOG_WARNING, "Multiple fisbone for the same stream\n");

            return 1;

        }

        if (start_granule != OGG_NOGRANULE_VALUE) {

            os->start_granule = start_granule;

        }

    }

    return 1;

}

const struct ogg_codec ff_skeleton_codec = {

    .magic = "fishead",

    .magicsize = 8,

    .header = skeleton_header,

    .nb_header = 0,

};