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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
#ifndef _ALU_H_
#define _ALU_H_
#include "AL/al.h"
#include "AL/alc.h"
#include "AL/alext.h"
#include <limits.h>
#include <math.h>
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif
#ifdef HAVE_IEEEFP_H
#include <ieeefp.h>
#endif
#ifndef M_PI
#define M_PI 3.14159265358979323846 /* pi */
#define M_PI_2 1.57079632679489661923 /* pi/2 */
#endif
#define F_PI ((float)M_PI)
#define F_PI_2 ((float)M_PI_2)
#ifdef HAVE_POWF
#define aluPow(x,y) (powf((x),(y)))
#else
#define aluPow(x,y) ((ALfloat)pow((double)(x),(double)(y)))
#endif
#ifdef HAVE_SQRTF
#define aluSqrt(x) (sqrtf((x)))
#else
#define aluSqrt(x) ((ALfloat)sqrt((double)(x)))
#endif
#ifdef HAVE_COSF
#define aluCos(x) (cosf((x)))
#else
#define aluCos(x) ((ALfloat)cos((double)(x)))
#endif
#ifdef HAVE_SINF
#define aluSin(x) (sinf((x)))
#else
#define aluSin(x) ((ALfloat)sin((double)(x)))
#endif
#ifdef HAVE_ACOSF
#define aluAcos(x) (acosf((x)))
#else
#define aluAcos(x) ((ALfloat)acos((double)(x)))
#endif
#ifdef HAVE_ASINF
#define aluAsin(x) (asinf((x)))
#else
#define aluAsin(x) ((ALfloat)asin((double)(x)))
#endif
#ifdef HAVE_ATANF
#define aluAtan(x) (atanf((x)))
#else
#define aluAtan(x) ((ALfloat)atan((double)(x)))
#endif
#ifdef HAVE_FABSF
#define aluFabs(x) (fabsf((x)))
#else
#define aluFabs(x) ((ALfloat)fabs((double)(x)))
#endif
#define QUADRANT_NUM 128
#define LUT_NUM (4 * QUADRANT_NUM)
#ifdef __cplusplus
extern "C" {
#endif
struct ALsource;
struct ALbuffer;
typedef ALvoid (*MixerFunc)(struct ALsource *self, ALCdevice *Device,
const ALvoid *RESTRICT data,
ALuint *DataPosInt, ALuint *DataPosFrac,
ALuint OutPos, ALuint SamplesToDo,
ALuint BufferSize);
enum Resampler {
POINT_RESAMPLER = 0,
LINEAR_RESAMPLER,
CUBIC_RESAMPLER,
RESAMPLER_MAX,
RESAMPLER_MIN = -1,
RESAMPLER_DEFAULT = LINEAR_RESAMPLER
};
enum Channel {
FRONT_LEFT = 0,
FRONT_RIGHT,
FRONT_CENTER,
LFE,
BACK_LEFT,
BACK_RIGHT,
BACK_CENTER,
SIDE_LEFT,
SIDE_RIGHT,
MAXCHANNELS
};
enum DistanceModel {
InverseDistanceClamped = AL_INVERSE_DISTANCE_CLAMPED,
LinearDistanceClamped = AL_LINEAR_DISTANCE_CLAMPED,
ExponentDistanceClamped = AL_EXPONENT_DISTANCE_CLAMPED,
InverseDistance = AL_INVERSE_DISTANCE,
LinearDistance = AL_LINEAR_DISTANCE,
ExponentDistance = AL_EXPONENT_DISTANCE,
DisableDistance = AL_NONE
};
#define BUFFERSIZE 4096
#define FRACTIONBITS (14)
#define FRACTIONONE (1<<FRACTIONBITS)
#define FRACTIONMASK (FRACTIONONE-1)
/* Size for temporary stack storage of buffer data. Larger values need more
* stack, while smaller values may need more iterations. The value needs to be
* a sensible size, however, as it constrains the max stepping value used for
* mixing.
* The mixer requires being able to do two samplings per mixing loop. A 16KB
* buffer can hold 512 sample frames for a 7.1 float buffer. With the cubic
* resampler (which requires 3 padding sample frames), this limits the maximum
* step to about 508. This means that buffer_freq*source_pitch cannot exceed
* device_freq*508 for an 8-channel 32-bit buffer. */
#ifndef STACK_DATA_SIZE
#define STACK_DATA_SIZE 16384
#endif
static __inline ALfloat minf(ALfloat a, ALfloat b)
{ return ((a > b) ? b : a); }
static __inline ALfloat maxf(ALfloat a, ALfloat b)
{ return ((a > b) ? a : b); }
static __inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
{ return minf(max, maxf(min, val)); }
static __inline ALuint minu(ALuint a, ALuint b)
{ return ((a > b) ? b : a); }
static __inline ALuint maxu(ALuint a, ALuint b)
{ return ((a > b) ? a : b); }
static __inline ALuint clampu(ALuint val, ALuint min, ALuint max)
{ return minu(max, maxu(min, val)); }
static __inline ALint mini(ALint a, ALint b)
{ return ((a > b) ? b : a); }
static __inline ALint maxi(ALint a, ALint b)
{ return ((a > b) ? a : b); }
static __inline ALint clampi(ALint val, ALint min, ALint max)
{ return mini(max, maxi(min, val)); }
static __inline ALdouble lerp(ALdouble val1, ALdouble val2, ALdouble mu)
{
return val1 + (val2-val1)*mu;
}
static __inline ALdouble cubic(ALdouble val0, ALdouble val1, ALdouble val2, ALdouble val3, ALdouble mu)
{
ALdouble mu2 = mu*mu;
ALdouble a0 = -0.5*val0 + 1.5*val1 + -1.5*val2 + 0.5*val3;
ALdouble a1 = val0 + -2.5*val1 + 2.0*val2 + -0.5*val3;
ALdouble a2 = -0.5*val0 + 0.5*val2;
ALdouble a3 = val1;
return a0*mu*mu2 + a1*mu2 + a2*mu + a3;
}
ALvoid aluInitPanning(ALCdevice *Device);
ALint aluCart2LUTpos(ALfloat re, ALfloat im);
ALvoid CalcSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
ALvoid CalcNonAttnSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
MixerFunc SelectMixer(struct ALbuffer *Buffer, enum Resampler Resampler);
MixerFunc SelectHrtfMixer(struct ALbuffer *Buffer, enum Resampler Resampler);
ALvoid MixSource(struct ALsource *Source, ALCdevice *Device, ALuint SamplesToDo);
ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
ALvoid aluHandleDisconnect(ALCdevice *device);
extern ALfloat ConeScale;
extern ALfloat ZScale;
#ifdef __cplusplus
}
#endif
#endif
|
