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libavformat/txd.c

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00001 /*
00002  * Renderware TeXture Dictionary (.txd) demuxer
00003  * Copyright (c) 2007 Ivo van Poorten
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/intreadwrite.h"
00023 #include "avformat.h"
00024 
00025 #define TXD_FILE            0x16
00026 #define TXD_INFO            0x01
00027 #define TXD_EXTRA           0x03
00028 #define TXD_TEXTURE         0x15
00029 #define TXD_TEXTURE_DATA    0x01
00030 #define TXD_MARKER          0x1803ffff
00031 #define TXD_MARKER2         0x1003ffff
00032 
00033 static int txd_probe(AVProbeData * pd) {
00034     if (AV_RL32(pd->buf  ) == TXD_FILE &&
00035        (AV_RL32(pd->buf+8) == TXD_MARKER || AV_RL32(pd->buf+8) == TXD_MARKER2))
00036         return AVPROBE_SCORE_MAX;
00037     return 0;
00038 }
00039 
00040 static int txd_read_header(AVFormatContext *s, AVFormatParameters *ap) {
00041     AVStream *st;
00042 
00043     st = av_new_stream(s, 0);
00044     if (!st)
00045         return AVERROR(ENOMEM);
00046     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00047     st->codec->codec_id = CODEC_ID_TXD;
00048     st->codec->time_base.den = 5;
00049     st->codec->time_base.num = 1;
00050     /* the parameters will be extracted from the compressed bitstream */
00051     return 0;
00052 }
00053 
00054 static int txd_read_packet(AVFormatContext *s, AVPacket *pkt) {
00055     ByteIOContext *pb = s->pb;
00056     unsigned int id, chunk_size, marker;
00057     int ret;
00058 
00059 next_chunk:
00060     id         = get_le32(pb);
00061     chunk_size = get_le32(pb);
00062     marker     = get_le32(pb);
00063 
00064     if (url_feof(s->pb))
00065         return AVERROR_EOF;
00066     if (marker != TXD_MARKER && marker != TXD_MARKER2) {
00067         av_log(s, AV_LOG_ERROR, "marker does not match\n");
00068         return AVERROR_INVALIDDATA;
00069     }
00070 
00071     switch (id) {
00072         case TXD_INFO:
00073             if (chunk_size > 100)
00074                 break;
00075         case TXD_EXTRA:
00076             url_fskip(s->pb, chunk_size);
00077         case TXD_FILE:
00078         case TXD_TEXTURE:
00079             goto next_chunk;
00080         default:
00081             av_log(s, AV_LOG_ERROR, "unknown chunk id %i\n", id);
00082             return AVERROR_INVALIDDATA;
00083     }
00084 
00085     ret = av_get_packet(s->pb, pkt, chunk_size);
00086     if (ret < 0)
00087         return ret;
00088     pkt->stream_index = 0;
00089 
00090     return 0;
00091 }
00092 
00093 AVInputFormat txd_demuxer =
00094 {
00095     "txd",
00096     NULL_IF_CONFIG_SMALL("Renderware TeXture Dictionary"),
00097     0,
00098     txd_probe,
00099     txd_read_header,
00100     txd_read_packet,
00101 };

Generated on Fri Sep 16 2011 17:17:44 for FFmpeg by  doxygen 1.7.1