/*

 * Chronomaster DFA Format Demuxer

 * Copyright (c) 2011 Konstantin Shishkov

 *

 * 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 <inttypes.h>

#include "libavutil/intreadwrite.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

static int dfa_probe(const AVProbeData *p)

{

    if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))

        return 0;

    if (AV_RL32(p->buf + 16) != 0x80)

        return AVPROBE_SCORE_MAX / 4;

    return AVPROBE_SCORE_MAX;

}

static int dfa_read_header(AVFormatContext *s)

{

    AVIOContext *pb = s->pb;

    AVStream *st;

    int frames, ret;

    int version;

    uint32_t mspf;

    if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) {

        av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n");

        return AVERROR_INVALIDDATA;

    }

    version = avio_rl16(pb);

    frames = avio_rl16(pb);

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;

    st->codecpar->codec_id   = AV_CODEC_ID_DFA;

    st->codecpar->width      = avio_rl16(pb);

    st->codecpar->height     = avio_rl16(pb);

    mspf = avio_rl32(pb);

    if (!mspf) {

        av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n");

        mspf = 100;

    }

    avpriv_set_pts_info(st, 24, mspf, 1000);

    avio_skip(pb, 128 - 16); // padding

    st->duration = frames;

    if ((ret = ff_alloc_extradata(st->codecpar, 2)) < 0)

        return ret;

    AV_WL16(st->codecpar->extradata, version);

    if (version == 0x100)

        st->sample_aspect_ratio = (AVRational){2, 1};

    return 0;

}

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

{

    AVIOContext *pb = s->pb;

    uint32_t frame_size;

    int ret, first = 1;

    if (avio_feof(pb))

        return AVERROR_EOF;

    if (av_get_packet(pb, pkt, 12) != 12)

        return AVERROR_INVALIDDATA;

    while (!avio_feof(pb)) {

        if (!first) {

            ret = av_append_packet(pb, pkt, 12);

            if (ret < 0) {

                return ret;

            }

        } else

            first = 0;

        frame_size = AV_RL32(pkt->data + pkt->size - 8);

        if (frame_size > INT_MAX - 4) {

            av_log(s, AV_LOG_ERROR, "Too large chunk size: %"PRIu32"\n", frame_size);

            return AVERROR_INVALIDDATA;

        }

        if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) {

            if (frame_size) {

                av_log(s, AV_LOG_WARNING,

                       "skipping %"PRIu32" bytes of end-of-frame marker chunk\n",

                       frame_size);

                avio_skip(pb, frame_size);

            }

            return 0;

        }

        ret = av_append_packet(pb, pkt, frame_size);

        if (ret < 0) {

            return ret;

        }

    }

    return 0;

}

const FFInputFormat ff_dfa_demuxer = {

    .p.name         = "dfa",

    .p.long_name    = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),

    .p.flags        = AVFMT_GENERIC_INDEX,

    .read_probe     = dfa_probe,

    .read_header    = dfa_read_header,

    .read_packet    = dfa_read_packet,

};