libavformat/txd.c

   1 /*
   2  * Renderware TeXture Dictionary (.txd) demuxer
   3  * Copyright (c) 2007 Ivo van Poorten
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avformat.h"
  23
  24 #define TXD_FILE            0x16
  25 #define TXD_INFO            0x01
  26 #define TXD_EXTRA           0x03
  27 #define TXD_TEXTURE         0x15
  28 #define TXD_TEXTURE_DATA    0x01
  29 #define TXD_MARKER          0x1803ffff
  30 #define TXD_MARKER2         0x1003ffff
  31
  32 static int txd_probe(AVProbeData * pd) {
  33     if (AV_RL32(pd->buf  ) == TXD_FILE &&
  34        (AV_RL32(pd->buf+8) == TXD_MARKER || AV_RL32(pd->buf+8) == TXD_MARKER2))
  35         return AVPROBE_SCORE_MAX;
  36     return 0;
  37 }
  38
  39 static int txd_read_header(AVFormatContext *s, AVFormatParameters *ap) {
  40     AVStream *st;
  41
  42     st = av_new_stream(s, 0);
  43     if (!st)
  44         return AVERROR(ENOMEM);
  45     st->codec->codec_type = CODEC_TYPE_VIDEO;
  46     st->codec->codec_id = CODEC_ID_TXD;
  47     st->codec->time_base.den = 5;
  48     st->codec->time_base.num = 1;
  49     /* the parameters will be extracted from the compressed bitstream */
  50     return 0;
  51 }
  52
  53 static int txd_read_packet(AVFormatContext *s, AVPacket *pkt) {
  54     ByteIOContext *pb = s->pb;
  55     unsigned int id, chunk_size, marker;
  56     int ret;
  57
  58 next_chunk:
  59     id         = get_le32(pb);
  60     chunk_size = get_le32(pb);
  61     marker     = get_le32(pb);
  62
  63     if (url_feof(s->pb))
  64         return AVERROR(EIO);
  65     if (marker != TXD_MARKER && marker != TXD_MARKER2) {
  66         av_log(NULL, AV_LOG_ERROR, "marker does not match\n");
  67         return AVERROR(EIO);
  68     }
  69
  70     switch (id) {
  71         case TXD_INFO:
  72             if (chunk_size > 100)
  73                 break;
  74         case TXD_EXTRA:
  75             url_fskip(s->pb, chunk_size);
  76         case TXD_FILE:
  77         case TXD_TEXTURE:
  78             goto next_chunk;
  79         default:
  80             av_log(NULL, AV_LOG_ERROR, "unknown chunk id %i\n", id);
  81             return AVERROR(EIO);
  82     }
  83
  84     ret = av_get_packet(s->pb, pkt, chunk_size);
  85     pkt->stream_index = 0;
  86
  87     return ret <= 0 ? AVERROR(EIO) : ret;
  88 }
  89
  90 AVInputFormat txd_demuxer =
  91 {
  92     "txd",
  93     NULL_IF_CONFIG_SMALL("txd format"),
  94     0,
  95     txd_probe,
  96     txd_read_header,
  97     txd_read_packet,
  98 };