Libav
txd.c
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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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 
41  AVStream *st;
42 
43  st = avformat_new_stream(s, NULL);
44  if (!st)
45  return AVERROR(ENOMEM);
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 
55  AVIOContext *pb = s->pb;
56  unsigned int id, chunk_size, marker;
57  int ret;
58 
59 next_chunk:
60  id = avio_rl32(pb);
61  chunk_size = avio_rl32(pb);
62  marker = avio_rl32(pb);
63 
64  if (s->pb->eof_reached)
65  return AVERROR_EOF;
66  if (marker != TXD_MARKER && marker != TXD_MARKER2) {
67  av_log(s, AV_LOG_ERROR, "marker does not match\n");
68  return AVERROR_INVALIDDATA;
69  }
70 
71  switch (id) {
72  case TXD_INFO:
73  if (chunk_size > 100)
74  break;
75  case TXD_EXTRA:
76  avio_skip(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_INVALIDDATA;
83  }
84 
85  ret = av_get_packet(s->pb, pkt, chunk_size);
86  if (ret < 0)
87  return ret;
88  pkt->stream_index = 0;
89 
90  return 0;
91 }
92 
94  .name = "txd",
95  .long_name = NULL_IF_CONFIG_SMALL("Renderware TeXture Dictionary"),
96  .read_probe = txd_probe,
97  .read_header = txd_read_header,
98  .read_packet = txd_read_packet,
99 };
static int txd_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: txd.c:54
#define TXD_FILE
Definition: txd.c:25
Bytestream IO Context.
Definition: avio.h:68
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
enum AVCodecID id
Definition: mxfenc.c:84
int num
numerator
Definition: rational.h:44
#define TXD_INFO
Definition: txd.c:26
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1173
Format I/O context.
Definition: avformat.h:871
#define AVERROR_EOF
End of file.
Definition: error.h:51
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:118
#define TXD_MARKER2
Definition: txd.c:31
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
static int txd_read_header(AVFormatContext *s)
Definition: txd.c:40
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:558
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:142
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2662
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:702
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:390
#define TXD_MARKER
Definition: txd.c:30
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:210
#define AV_RL32
Definition: intreadwrite.h:146
Stream structure.
Definition: avformat.h:683
NULL
Definition: eval.c:55
enum AVMediaType codec_type
Definition: avcodec.h:1062
enum AVCodecID codec_id
Definition: avcodec.h:1065
AVIOContext * pb
I/O context.
Definition: avformat.h:913
static int txd_probe(AVProbeData *pd)
Definition: txd.c:33
This structure contains the data a format has to probe a file.
Definition: avformat.h:388
AVInputFormat ff_txd_demuxer
Definition: txd.c:93
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:395
Main libavformat public API header.
int den
denominator
Definition: rational.h:45
#define TXD_TEXTURE
Definition: txd.c:28
#define TXD_EXTRA
Definition: txd.c:27
int eof_reached
true if eof reached
Definition: avio.h:96
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:516
int stream_index
Definition: avcodec.h:975
This structure stores compressed data.
Definition: avcodec.h:950