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ffmpeg / libavformat / txd.c @ b7effd4e

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/*
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 * Renderware TeXture Dictionary (.txd) demuxer
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 * Copyright (c) 2007 Ivo van Poorten
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#define TXD_FILE            0x16
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#define TXD_INFO            0x01
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#define TXD_EXTRA           0x03
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#define TXD_TEXTURE         0x15
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#define TXD_TEXTURE_DATA    0x01
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#define TXD_MARKER          0x1803ffff
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#define TXD_MARKER2         0x1003ffff
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static int txd_probe(AVProbeData * pd) {
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    if (AV_RL32(pd->buf  ) == TXD_FILE &&
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       (AV_RL32(pd->buf+8) == TXD_MARKER || AV_RL32(pd->buf+8) == TXD_MARKER2))
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        return AVPROBE_SCORE_MAX;
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    return 0;
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}
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static int txd_read_header(AVFormatContext *s, AVFormatParameters *ap) {
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    AVStream *st;
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    st = av_new_stream(s, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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    st->codec->codec_id = CODEC_ID_TXD;
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    st->codec->time_base.den = 5;
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    st->codec->time_base.num = 1;
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    /* the parameters will be extracted from the compressed bitstream */
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    return 0;
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}
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static int txd_read_packet(AVFormatContext *s, AVPacket *pkt) {
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    AVIOContext *pb = s->pb;
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    unsigned int id, chunk_size, marker;
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    int ret;
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next_chunk:
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    id         = avio_rl32(pb);
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    chunk_size = avio_rl32(pb);
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    marker     = avio_rl32(pb);
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    if (url_feof(s->pb))
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        return AVERROR_EOF;
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    if (marker != TXD_MARKER && marker != TXD_MARKER2) {
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        av_log(s, AV_LOG_ERROR, "marker does not match\n");
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        return AVERROR_INVALIDDATA;
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    }
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    switch (id) {
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        case TXD_INFO:
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            if (chunk_size > 100)
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                break;
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        case TXD_EXTRA:
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            url_fskip(s->pb, chunk_size);
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        case TXD_FILE:
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        case TXD_TEXTURE:
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            goto next_chunk;
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        default:
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            av_log(s, AV_LOG_ERROR, "unknown chunk id %i\n", id);
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            return AVERROR_INVALIDDATA;
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    }
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    ret = av_get_packet(s->pb, pkt, chunk_size);
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    if (ret < 0)
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        return ret;
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    pkt->stream_index = 0;
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    return 0;
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}
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AVInputFormat ff_txd_demuxer =
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{
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    "txd",
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    NULL_IF_CONFIG_SMALL("Renderware TeXture Dictionary"),
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    0,
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    txd_probe,
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    txd_read_header,
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    txd_read_packet,
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};