PeerStreamer

/*

 * Renderware TeXture Dictionary (.txd) demuxer

 * Copyright (c) 2007 Ivo van Poorten

 *

 * 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"

#define TXD_FILE            0x16

#define TXD_INFO            0x01

#define TXD_EXTRA           0x03

#define TXD_TEXTURE         0x15

#define TXD_TEXTURE_DATA    0x01

#define TXD_MARKER          0x1803ffff

#define TXD_MARKER2         0x1003ffff

static int txd_probe(AVProbeData * pd) {

    if (AV_RL32(pd->buf  ) == TXD_FILE &&

       (AV_RL32(pd->buf+8) == TXD_MARKER || AV_RL32(pd->buf+8) == TXD_MARKER2))

        return AVPROBE_SCORE_MAX;

    return 0;

}

static int txd_read_header(AVFormatContext *s, AVFormatParameters *ap) {

    AVStream *st;

    st = av_new_stream(s, 0);

    if (!st)

        return AVERROR(ENOMEM);

    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

    st->codec->codec_id = CODEC_ID_TXD;

    st->codec->time_base.den = 5;

    st->codec->time_base.num = 1;

    /* the parameters will be extracted from the compressed bitstream */

    return 0;

}

static int txd_read_packet(AVFormatContext *s, AVPacket *pkt) {

    AVIOContext *pb = s->pb;

    unsigned int id, chunk_size, marker;

    int ret;

next_chunk:

    id         = avio_rl32(pb);

    chunk_size = avio_rl32(pb);

    marker     = avio_rl32(pb);

    if (s->pb->eof_reached)

        return AVERROR_EOF;

    if (marker != TXD_MARKER && marker != TXD_MARKER2) {

        av_log(s, AV_LOG_ERROR, "marker does not match\n");

        return AVERROR_INVALIDDATA;

    }

    switch (id) {

        case TXD_INFO:

            if (chunk_size > 100)

                break;

        case TXD_EXTRA:

            avio_seek(s->pb, chunk_size, SEEK_CUR);

        case TXD_FILE:

        case TXD_TEXTURE:

            goto next_chunk;

        default:

            av_log(s, AV_LOG_ERROR, "unknown chunk id %i\n", id);

            return AVERROR_INVALIDDATA;

    }

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

    if (ret < 0)

        return ret;

    pkt->stream_index = 0;

    return 0;

}

AVInputFormat ff_txd_demuxer =

{

    "txd",

    NULL_IF_CONFIG_SMALL("Renderware TeXture Dictionary"),

    0,

    txd_probe,

    txd_read_header,

    txd_read_packet,

};