1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
/*
* libkarma/mp3.h
*
* Copyright (c) Cedric Tefft <cedric@earthling.net> 2000-2001
* (c) Frank Zschockelt <libkarma@freakysoft.de> 2004
*
* You may distribute and modify this program under the terms of
* the GNU GPL, version 2 or later.
*
***************************************************************************
* This file is based in part on:
* MP3Info 0.5 by Ricardo Cerqueira <rmc@rccn.net>
* MP3Stat 0.9 by Ed Sweetman <safemode@voicenet.com> and
* Johannes Overmann <overmann@iname.com>
*
*/
#ifndef _MP3_H
#define _MP3_H
/* MIN_CONSEC_GOOD_FRAMES defines how many consecutive valid MP3 frames
we need to see before we decide we are looking at a real MP3 file */
#define MIN_CONSEC_GOOD_FRAMES 4
#define FRAME_HEADER_SIZE 4
#define MIN_FRAME_SIZE 21
#define NUM_SAMPLES 4
typedef struct {
unsigned long sync;
unsigned int version;
unsigned int layer;
unsigned int crc;
unsigned int bitrate;
unsigned int freq;
unsigned int padding;
unsigned int extension;
} mp3header;
typedef struct {
char title[31];
char artist[31];
char album[31];
char year[5];
char comment[31];
unsigned char track[1];
unsigned char genre[1];
} id3tag;
typedef struct {
char *filename;
FILE *file;
off_t datasize;
int header_isvalid;
mp3header header;
int id3_isvalid;
id3tag id3;
int vbr;
int vbr_average;
int ms;
int offset;
int frames;
int badframes;
} mp3info;
int get_mp3_info(mp3info *mp3);
int header_layer(mp3header *h);
int header_bitrate(mp3header *h);
int header_frequency(mp3header *h);
int write_tag(mp3info *mp3);
#endif /* _MP3_H */
|