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 "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, AVFormatParameters *ap) {
  41     AVStream *st;
  42
  43     st = av_new_stream(s, 0);
  44     if (!st)
  45         return AVERROR(ENOMEM);
  46     st->codec->codec_type = CODEC_TYPE_VIDEO;
  47     st->codec->codec_id = 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     return 0;
  52 }
  53
  54 static int txd_read_packet(AVFormatContext *s, AVPacket *pkt) {
  55     ByteIOContext *pb = s->pb;
  56     unsigned int id, chunk_size, marker;
  57     int ret;
  58
  59 next_chunk:
  60     id         = get_le32(pb);
  61     chunk_size = get_le32(pb);
  62     marker     = get_le32(pb);
  63
  64     if (url_feof(s->pb))
  65         return AVERROR(EIO);
  66     if (marker != TXD_MARKER && marker != TXD_MARKER2) {
  67         av_log(s, AV_LOG_ERROR, "marker does not match\n");
  68         return AVERROR(EIO);
  69     }
  70
  71     switch (id) {
  72         case TXD_INFO:
  73             if (chunk_size > 100)
  74                 break;
  75         case TXD_EXTRA:
  76             url_fskip(s->pb, chunk_size);
  77         case TXD_FILE:
  78         case TXD_TEXTURE:
  79             goto next_chunk;
  80         default:
  81             av_log(s, AV_LOG_ERROR, "unknown chunk id %i\n", id);
  82             return AVERROR(EIO);
  83     }
  84
  85     ret = av_get_packet(s->pb, pkt, chunk_size);
  86     pkt->stream_index = 0;
  87
  88     return ret <= 0 ? AVERROR(EIO) : ret;
  89 }
  90
  91 AVInputFormat txd_demuxer =
  92 {
  93     "txd",
  94     NULL_IF_CONFIG_SMALL("Renderware TeXture Dictionary"),
  95     0,
  96     txd_probe,
  97     txd_read_header,
  98     txd_read_packet,
  99 };