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  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 "libavutil/intreadwrite.h"
  23. #include "avformat.h"
  24.  
  25. #define TXD_FILE            0x16
  26. #define TXD_INFO            0x01
  27. #define TXD_EXTRA           0x03
  28. #define TXD_TEXTURE         0x15
  29. #define TXD_TEXTURE_DATA    0x01
  30. #define TXD_MARKER          0x1803ffff
  31. #define TXD_MARKER2         0x1003ffff
  32.  
  33. static int txd_probe(AVProbeData * pd) {
  34.     if (AV_RL32(pd->buf  ) == TXD_FILE &&
  35.        (AV_RL32(pd->buf+8) == TXD_MARKER || AV_RL32(pd->buf+8) == TXD_MARKER2))
  36.         return AVPROBE_SCORE_MAX;
  37.     return 0;
  38. }
  39.  
  40. static int txd_read_header(AVFormatContext *s) {
  41.     AVStream *st;
  42.  
  43.     st = avformat_new_stream(s, NULL);
  44.     if (!st)
  45.         return AVERROR(ENOMEM);
  46.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  47.     st->codec->codec_id = AV_CODEC_ID_TXD;
  48.     st->codec->time_base.den = 5;
  49.     st->codec->time_base.num = 1;
  50.     /* the parameters will be extracted from the compressed bitstream */
  51.  
  52.     return 0;
  53. }
  54.  
  55. static int txd_read_packet(AVFormatContext *s, AVPacket *pkt) {
  56.     AVIOContext *pb = s->pb;
  57.     unsigned int id, chunk_size, marker;
  58.     int ret;
  59.  
  60. next_chunk:
  61.     id         = avio_rl32(pb);
  62.     chunk_size = avio_rl32(pb);
  63.     marker     = avio_rl32(pb);
  64.  
  65.     if (url_feof(s->pb))
  66.         return AVERROR_EOF;
  67.     if (marker != TXD_MARKER && marker != TXD_MARKER2) {
  68.         av_log(s, AV_LOG_ERROR, "marker does not match\n");
  69.         return AVERROR_INVALIDDATA;
  70.     }
  71.  
  72.     switch (id) {
  73.     case TXD_INFO:
  74.         if (chunk_size > 100)
  75.             break;
  76.     case TXD_EXTRA:
  77.         avio_skip(s->pb, chunk_size);
  78.     case TXD_FILE:
  79.     case TXD_TEXTURE:
  80.         goto next_chunk;
  81.     default:
  82.         av_log(s, AV_LOG_ERROR, "unknown chunk id %i\n", id);
  83.         return AVERROR_INVALIDDATA;
  84.     }
  85.  
  86.     ret = av_get_packet(s->pb, pkt, chunk_size);
  87.     if (ret < 0)
  88.         return ret;
  89.     pkt->stream_index = 0;
  90.  
  91.     return 0;
  92. }
  93.  
  94. AVInputFormat ff_txd_demuxer = {
  95.     .name        = "txd",
  96.     .long_name   = NULL_IF_CONFIG_SMALL("Renderware TeXture Dictionary"),
  97.     .read_probe  = txd_probe,
  98.     .read_header = txd_read_header,
  99.     .read_packet = txd_read_packet,
  100. };
  101.