FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
mtaf.c
Go to the documentation of this file.
1 /*
2  * MTAF demuxer
3  * Copyright (c) 2016 Paul B Mahol
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 
23 #include "libavutil/intreadwrite.h"
24 #include "avformat.h"
25 #include "internal.h"
26 
27 static int mtaf_probe(AVProbeData *p)
28 {
29  if (p->buf_size < 0x44)
30  return 0;
31 
32  if (AV_RL32(p->buf) != MKTAG('M','T','A','F') ||
33  AV_RL32(p->buf + 0x40) != MKTAG('H','E','A','D'))
34  return 0;
35 
36  return AVPROBE_SCORE_MAX;
37 }
38 
40 {
41  int stream_count;
42  AVStream *st;
43 
44  st = avformat_new_stream(s, NULL);
45  if (!st)
46  return AVERROR(ENOMEM);
47 
48  avio_skip(s->pb, 0x5c);
49  st->duration = avio_rl32(s->pb);
50  avio_skip(s->pb, 1);
51  stream_count = avio_r8(s->pb);
52  if (!stream_count)
53  return AVERROR_INVALIDDATA;
54 
57  st->codecpar->channels = 2 * stream_count;
58  st->codecpar->sample_rate = 48000;
59  st->codecpar->block_align = 0x110 * st->codecpar->channels / 2;
60  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
61 
62  avio_seek(s->pb, 0x800, SEEK_SET);
63 
64  return 0;
65 }
66 
68 {
69  AVCodecParameters *par = s->streams[0]->codecpar;
70 
71  return av_get_packet(s->pb, pkt, par->block_align);
72 }
73 
75  .name = "mtaf",
76  .long_name = NULL_IF_CONFIG_SMALL("Konami PS2 MTAF"),
77  .read_probe = mtaf_probe,
78  .read_header = mtaf_read_header,
79  .read_packet = mtaf_read_packet,
80  .extensions = "mtaf",
81 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
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:4820
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3876
Format I/O context.
Definition: avformat.h:1342
AVInputFormat ff_mtaf_demuxer
Definition: mtaf.c:74
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4450
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
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:310
static int mtaf_probe(AVProbeData *p)
Definition: mtaf.c:27
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:770
#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:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3880
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:639
static int mtaf_read_header(AVFormatContext *s)
Definition: mtaf.c:39
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:451
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
int block_align
Audio only.
Definition: avcodec.h:4001
audio channel layout utility functions
static int mtaf_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mtaf.c:67
Stream structure.
Definition: avformat.h:873
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
int sample_rate
Audio only.
Definition: avcodec.h:3994
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
Main libavformat public API header.
int channels
Audio only.
Definition: avcodec.h:3990
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
#define MKTAG(a, b, c, d)
Definition: common.h:366
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1407