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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
#ifndef __WAVREADER_H__
#define __WAVREADER_H__
typedef UInt32 FOURCC;
struct RIFF_TAG {
FOURCC RIFF;
UInt32 size;
};
struct WAV_HEADER {
FOURCC RIFF;
UInt32 size;
FOURCC type;
};
struct WAV_FORMAT {
FOURCC ID;
UInt32 size;
UInt16 format;
UInt16 channels;
UInt32 samplerate;
UInt32 avgBytesSec;
UInt16 blockalign;
UInt16 bitsPerSample;
};
struct WAV_DATA {
FOURCC ID;
UInt32 size;
};
#if !UNITY_BIG_ENDIAN
#ifndef MAKEFOURCC
#define MAKEFOURCC(ch0, ch1, ch2, ch3) \
((UInt32)(UInt8)(ch0) | ((UInt32)(UInt8)(ch1) << 8) | \
((UInt32)(UInt8)(ch2) << 16) | ((UInt32)(UInt8)(ch3) << 24 ))
#endif
#define btoll(x) (x)
#define btols(x) (x)
#else
#ifndef MAKEFOURCC
#define MAKEFOURCC(ch0, ch1, ch2, ch3) \
((UInt32)(UInt8)(ch0) << 24 | ((UInt32)(UInt8)(ch1) << 16) | \
((UInt32)(UInt8)(ch2) << 8) | ((UInt32)(UInt8)(ch3) ))
#endif
#define btoll(x) (((x) >> 24) | (((x)&0x00ff0000) >> 8) | (((x)&0x0000ff00) << 8) | ((x) << 24))
#define btols(x) (((x) >> 8) | ((x&0xff) << 8))
#endif
#define RIFF_RIFF MAKEFOURCC('R','I','F','F')
#define RIFF_WAVE MAKEFOURCC('W','A','V','E')
#define RIFF_FORMAT MAKEFOURCC('f','m','t',' ')
#define RIFF_DATA MAKEFOURCC('d','a','t','a')
static const UInt8* GetRIFFChunk ( FOURCC fourcc, const UInt8* wavRiff )
{
UInt8* p = const_cast<UInt8*>(wavRiff);
UInt32 next = *((UInt32*)p);
if (next != RIFF_RIFF) // not a RIFF file
return NULL;
UInt32 totalSize = (UInt32) *((UInt32*)(p + 4));
// next chunk
p += 12;
next = *((UInt32*)p);
while (next != fourcc)
{
UInt32 size = (UInt32) *((UInt32*)(p + 4));
// next chunk
p += 8;
p += size;
next = *((UInt32*)p);
if (p - wavRiff >= totalSize)
return NULL;
}
return p;
}
static bool IsWAV(const UInt8* wavRiff)
{
return ((*((UInt32*)wavRiff) == RIFF_RIFF) &&
(((WAV_HEADER*)(wavRiff))->type == RIFF_WAVE));
}
// @note return in little endian
static const WAV_HEADER* GetWAVHeader(const UInt8* wavRiff)
{
return (WAV_HEADER*)wavRiff;
}
// @note return in little endian
static const WAV_FORMAT* GetWAVFormat(const UInt8* wavRiff)
{
return (WAV_FORMAT*)GetRIFFChunk(RIFF_FORMAT, wavRiff);
}
// @note return in little endian
static const WAV_DATA* GetWAVData(const UInt8* wavRiff)
{
return (WAV_DATA*)GetRIFFChunk(RIFF_DATA, wavRiff);
}
// endian-safe
static bool IsNormalWAV(const UInt8* wavRiff)
{
return IsWAV(wavRiff) && (GetWAVFormat(wavRiff)->format == 1);
}
// endian-safe
static UInt32 GetWAVSize(const UInt8* wavRiff)
{
return btoll(GetWAVHeader(wavRiff)->size);
}
static void CreateRIFFTag(RIFF_TAG& tag, FOURCC fourCC, int size)
{
tag.RIFF = fourCC;
tag.size = btoll(size);
}
static void CreateWAVHeader( WAV_HEADER &header, int size, int additionalTagSize = 0 )
{
header.RIFF = MAKEFOURCC('R','I','F','F');
header.size = btoll ( sizeof (WAV_HEADER) + sizeof (WAV_FORMAT) + sizeof (WAV_DATA) + size + additionalTagSize );
header.type = MAKEFOURCC('W','A','V','E');
}
static void CreateFMTTag( WAV_FORMAT &format, int channels, int frequency, int bitsPerSample )
{
format.ID = MAKEFOURCC('f','m','t',' ');;
format.size = btoll(16);
format.format = btols(1);
format.channels = btols(channels);
format.samplerate = btoll(frequency);
format.avgBytesSec = btoll((frequency * bitsPerSample) / 8);
format.blockalign = btols(bitsPerSample / 8);
format.bitsPerSample = btols(bitsPerSample);
}
/**
* reconstructing a wav header + alloc size for data
* @param frequency Frequency
* @param size The size of the data
* @param channels channels
* @param bitsPerSamples Bits pr. sample
* @param ppData ptr to data chunk
* @return ptr to header
**/
static UInt8* CreateWAV(int frequency, int size, int channels, int bitsPerSample, UInt8** ppData)
{
WAV_HEADER header;
WAV_FORMAT format;
WAV_DATA data;
CreateWAVHeader(header, size);
CreateFMTTag(format, channels, frequency, bitsPerSample);
CreateRIFFTag((RIFF_TAG&)data, MAKEFOURCC('d','a','t','a'), size);
UInt8* wav = new UInt8[ sizeof (WAV_HEADER) + sizeof (WAV_FORMAT) + sizeof (WAV_DATA) + size ];
memcpy(wav, &header, sizeof(WAV_HEADER));
memcpy(wav + sizeof(WAV_HEADER), &format, sizeof(WAV_FORMAT));
memcpy(wav + sizeof(WAV_HEADER) + sizeof(WAV_FORMAT), &data, sizeof(WAV_DATA));
*ppData = (UInt8*)(wav + sizeof(WAV_HEADER) + sizeof(WAV_FORMAT)) + 8;
return wav;
}
#endif // __WAVREADER_H__
|
