FFmpeg
txd.c
Go to the documentation of this file.
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 #include "internal.h"
25 
26 #define TXD_FILE 0x16
27 #define TXD_INFO 0x01
28 #define TXD_EXTRA 0x03
29 #define TXD_TEXTURE 0x15
30 #define TXD_TEXTURE_DATA 0x01
31 #define TXD_MARKER 0x1803ffff
32 #define TXD_MARKER2 0x1003ffff
33 
34 static int txd_probe(const AVProbeData * pd) {
35  if (AV_RL32(pd->buf ) == TXD_FILE &&
36  (AV_RL32(pd->buf+8) == TXD_MARKER || AV_RL32(pd->buf+8) == TXD_MARKER2))
37  return AVPROBE_SCORE_MAX;
38  return 0;
39 }
40 
42  AVStream *st;
43 
44  st = avformat_new_stream(s, NULL);
45  if (!st)
46  return AVERROR(ENOMEM);
49  avpriv_set_pts_info(st, 64, 1, 5);
51  /* the parameters will be extracted from the compressed bitstream */
52 
53  return 0;
54 }
55 
57  AVIOContext *pb = s->pb;
58  unsigned int id, chunk_size, marker;
59  int ret;
60 
61 next_chunk:
62  id = avio_rl32(pb);
63  chunk_size = avio_rl32(pb);
64  marker = avio_rl32(pb);
65 
66  if (avio_feof(s->pb))
67  return AVERROR_EOF;
68  if (marker != TXD_MARKER && marker != TXD_MARKER2) {
69  av_log(s, AV_LOG_ERROR, "marker does not match\n");
70  return AVERROR_INVALIDDATA;
71  }
72 
73  switch (id) {
74  case TXD_INFO:
75  if (chunk_size > 100)
76  break;
77  case TXD_EXTRA:
78  avio_skip(s->pb, chunk_size);
79  case TXD_FILE:
80  case TXD_TEXTURE:
81  goto next_chunk;
82  default:
83  av_log(s, AV_LOG_ERROR, "unknown chunk id %i\n", id);
84  return AVERROR_INVALIDDATA;
85  }
86 
87  ret = av_get_packet(s->pb, pkt, chunk_size);
88  if (ret < 0)
89  return ret;
90  pkt->stream_index = 0;
91 
92  return 0;
93 }
94 
96  .name = "txd",
97  .long_name = NULL_IF_CONFIG_SMALL("Renderware TeXture Dictionary"),
98  .read_probe = txd_probe,
99  .read_header = txd_read_header,
100  .read_packet = txd_read_packet,
101 };
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4347
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AV_CODEC_ID_TXD
@ AV_CODEC_ID_TXD
Definition: codec_id.h:155
AVStream::avg_frame_rate
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:914
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
TXD_MARKER
#define TXD_MARKER
Definition: txd.c:31
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVInputFormat
Definition: avformat.h:626
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
txd_probe
static int txd_probe(const AVProbeData *pd)
Definition: txd.c:34
txd_read_packet
static int txd_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: txd.c:56
AVFormatContext
Format I/O context.
Definition: avformat.h:1107
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:994
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:870
NULL
#define NULL
Definition: coverity.c:32
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:742
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
id
enum AVCodecID id
Definition: extract_extradata_bsf.c:325
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4771
TXD_MARKER2
#define TXD_MARKER2
Definition: txd.c:32
txd_read_header
static int txd_read_header(AVFormatContext *s)
Definition: txd.c:41
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
ff_txd_demuxer
const AVInputFormat ff_txd_demuxer
Definition: txd.c:95
av_get_packet
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:257
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:847
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
TXD_FILE
#define TXD_FILE
Definition: txd.c:26
AVPacket::stream_index
int stream_index
Definition: packet.h:375
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:333
TXD_TEXTURE
#define TXD_TEXTURE
Definition: txd.c:29
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
TXD_INFO
#define TXD_INFO
Definition: txd.c:27
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:360
TXD_EXTRA
#define TXD_EXTRA
Definition: txd.c:28