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
|
//=============================================================================
// Zerberus
// Zample player
//
// Copyright (C) 2013 Werner Schweer
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2
// as published by the Free Software Foundation and appearing in
// the file LICENCE.GPL
//=============================================================================
#ifndef __MVOICE_H__
#define __MVOICE_H__
#include <cstdint>
#include <math.h>
#include "filter.h"
// Disable warning C4201: nonstandard extension used: nameless struct/union in VS2017
#if (defined (_MSCVER) || defined (_MSC_VER))
#pragma warning ( disable: 4201)
#endif
class Channel;
struct Zone;
class Sample;
class Zerberus;
enum class LoopMode : char;
enum class OffMode : char;
enum class Trigger : char;
static const int EG_SIZE = 256;
//---------------------------------------------------------
// Envelope
//---------------------------------------------------------
struct Envelope {
static float egPow[EG_SIZE];
static float egLin[EG_SIZE];
int steps, count;
bool constant = false;
float offset = 0.0;
float max = 1.0;
float val;
float* table;
void setTable(float* f) { table = f; }
bool step() {
if (count) {
--count;
if (!constant)
val = table[EG_SIZE * count/steps]*(max-offset)+offset;
return false;
}
else
return true;
}
void setTime(float ms, int sampleRate);
void setConstant(float v) { constant = true; val = v; }
void setVariable() { constant = false; }
};
//-----------------------------------------------------------------------------
// Phase
// Playing pointer for voice playback
//
// When a sample is played back at a different pitch, the playing pointer
// in the source sample will not advance exactly one sample per output sample.
//
// This playing pointer is implemented using Phase.
//-----------------------------------------------------------------------------
struct Phase {
union {
int64_t data;
struct {
uint8_t _fract;
};
};
void operator+=(const Phase& p) { data += p.data; }
void set(int b) { data = b * 256; }
void set(double b) { data = b * 256.0; }
void setIndex(int b) { data = b * 256 + _fract; }
int index() const { return data >> 8; }
unsigned fract() const { return _fract; }
Phase() {}
Phase(int64_t v) : data(v) {}
};
enum class VoiceState : char {
OFF,
ATTACK,
PLAYING,
SUSTAINED,
STOP
};
enum V1Envelopes : int {
DELAY,
ATTACK,
HOLD,
DECAY,
SUSTAIN,
RELEASE,
COUNT
};
//---------------------------------------------------------
// Voice
//---------------------------------------------------------
class Voice {
Voice* _next;
Zerberus* _zerberus;
VoiceState _state = VoiceState::OFF;
Channel* _channel;
int _key;
int _velocity;
int audioChan;
short* data;
long long eidx;
LoopMode _loopMode;
OffMode _offMode;
int _offBy;
long long _loopStart;
long long _loopEnd;
bool _looping;
int _samplesSinceStart;
float gain;
Phase phase, phaseIncr;
ZFilter filter;
int currentEnvelope;
Envelope envelopes[V1Envelopes::COUNT];
Trigger trigger;
const Zone* z;
public:
Voice(Zerberus*);
Voice* next() const { return _next; }
void setNext(Voice* v) { _next = v; }
void start(Channel* channel, int key, int velo, const Zone*, double durSinceNoteOn);
void updateEnvelopes();
void process(int frames, float*);
void updateLoop();
short getData(long long pos);
Channel* channel() const { return _channel; }
int key() const { return _key; }
int velocity() const { return _velocity; }
bool isPlaying() const { return _state == VoiceState::PLAYING || _state == VoiceState::ATTACK; }
bool isSustained() const { return _state == VoiceState::SUSTAINED; }
bool isOff() const { return _state == VoiceState::OFF; }
bool isStopped() const { return _state == VoiceState::STOP; }
void stop() { envelopes[currentEnvelope].step(); envelopes[V1Envelopes::RELEASE].max = envelopes[currentEnvelope].val; currentEnvelope = V1Envelopes::RELEASE; _state = VoiceState::STOP; }
void stop(float time);
void sustained() { _state = VoiceState::SUSTAINED; }
void off() { _state = VoiceState::OFF; }
const char* state() const;
LoopMode loopMode() const { return _loopMode; }
int getSamplesSinceStart() { return _samplesSinceStart; }
float getGain() { return gain; }
OffMode offMode() const { return _offMode; }
int offBy() const { return _offBy; }
static void init();
};
#endif
|
