blob: 0cfa665db623f1667052e38f2b4e678e40907615 (
plain)
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
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/*
libdemac - A Monkey's Audio decoder
$Id: parser.h 19552 2008-12-21 23:49:02Z amiconn $
Copyright (C) Dave Chapman 2007
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
*/
#ifndef _APE_PARSER_H
#define _APE_PARSER_H
#include <inttypes.h>
#include "demac_config.h"
/* The earliest and latest file formats supported by this library */
#define APE_MIN_VERSION 3970
#define APE_MAX_VERSION 3990
#define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]
#define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]
#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]
#define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]
#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level
#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)
/* Special frame codes:
MONO_SILENCE - All PCM samples in frame are zero (mono streams only)
LEFT_SILENCE - All PCM samples for left channel in frame are zero (stereo streams)
RIGHT_SILENCE - All PCM samples for left channel in frame are zero (stereo streams)
PSEUDO_STEREO - Left and Right channels are identical
*/
#define APE_FRAMECODE_MONO_SILENCE 1
#define APE_FRAMECODE_LEFT_SILENCE 1 /* same as mono */
#define APE_FRAMECODE_RIGHT_SILENCE 2
#define APE_FRAMECODE_STEREO_SILENCE 3 /* combined */
#define APE_FRAMECODE_PSEUDO_STEREO 4
#define PREDICTOR_ORDER 8
/* Total size of all predictor histories - 50 * sizeof(int32_t) */
#define PREDICTOR_SIZE 50
/* NOTE: This struct is used in predictor-arm.S - any updates need to
be reflected there. */
struct predictor_t
{
/* Filter histories */
int32_t* buf;
int32_t YlastA;
int32_t XlastA;
/* NOTE: The order of the next four fields is important for
predictor-arm.S */
int32_t YfilterB;
int32_t XfilterA;
int32_t XfilterB;
int32_t YfilterA;
/* Adaption co-efficients */
int32_t YcoeffsA[4];
int32_t XcoeffsA[4];
int32_t YcoeffsB[5];
int32_t XcoeffsB[5];
int32_t historybuffer[PREDICTOR_HISTORY_SIZE + PREDICTOR_SIZE];
};
struct ape_ctx_t
{
/* Derived fields */
uint32_t junklength;
uint32_t firstframe;
uint32_t totalsamples;
/* Info from Descriptor Block */
char magic[4];
int16_t fileversion;
int16_t padding1;
uint32_t descriptorlength;
uint32_t headerlength;
uint32_t seektablelength;
uint32_t wavheaderlength;
uint32_t audiodatalength;
uint32_t audiodatalength_high;
uint32_t wavtaillength;
uint8_t md5[16];
/* Info from Header Block */
uint16_t compressiontype;
uint16_t formatflags;
uint32_t blocksperframe;
uint32_t finalframeblocks;
uint32_t totalframes;
uint16_t bps;
uint16_t channels;
uint32_t samplerate;
/* Seektable */
uint32_t* seektable; /* Seektable buffer */
uint32_t maxseekpoints; /* Max seekpoints we can store (size of seektable buffer) */
uint32_t numseekpoints; /* Number of seekpoints */
int seektablefilepos; /* Location in .ape file of seektable */
/* Decoder state */
uint32_t CRC;
int frameflags;
int currentframeblocks;
int blocksdecoded;
struct predictor_t predictor;
};
int ape_parseheader(int fd, struct ape_ctx_t* ape_ctx);
int ape_parseheaderbuf(unsigned char* buf, struct ape_ctx_t* ape_ctx);
void ape_dumpinfo(struct ape_ctx_t* ape_ctx);
#endif
|
