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
|
/*
* Copyright 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SOUNDBOARD_SYNTH_H
#define SOUNDBOARD_SYNTH_H
#include <array>
#include <TappableAudioSource.h>
#include <SynthSound.h>
#include <Mixer.h>
#include <MonoToStereo.h>
constexpr float kOscBaseFrequency = 196.00; // Start at G3
constexpr float kOscFrequencyMultiplier = 1.05946309436;
constexpr float kOscBaseAmplitude = 0.20;
constexpr float kOscAmplitudeMultiplier = 0.96;
class Synth : public IRenderableAudio, public ITappable {
public:
static ::std::shared_ptr<Synth> create(const int32_t sampleRate, const int32_t channelCount, const int32_t numSignals) {
return ::std::make_shared<Synth>(sampleRate, channelCount, numSignals);
}
Synth(const int32_t sampleRate, const int32_t channelCount, const int32_t numSignals) {
mNumSignals = numSignals;
mOscs = std::make_unique<SynthSound[]>(numSignals);
float curFrequency = kOscBaseFrequency;
float curAmplitude = kOscBaseAmplitude;
for (int i = 0; i < numSignals; ++i) {
mOscs[i].setSampleRate(sampleRate);
mOscs[i].setFrequency(curFrequency);
curFrequency *= kOscFrequencyMultiplier;
mOscs[i].setAmplitude(curAmplitude);
curAmplitude *= kOscAmplitudeMultiplier;
mMixer.addTrack(&mOscs[i]);
}
if (channelCount == oboe::ChannelCount::Stereo) {
mOutputStage = &mConverter;
} else {
mOutputStage = &mMixer;
}
}
void noteOff(int32_t noteIndex) {
mOscs[noteIndex].noteOff();
}
void noteOn(int32_t noteIndex) {
mOscs[noteIndex].noteOn();
}
void tap(bool isOn) override {
for (int i = 0; i < mNumSignals; i++) {
if (isOn) {
mOscs[i].noteOn();
} else {
mOscs[i].noteOff();
}
}
};
// From IRenderableAudio
void renderAudio(float *audioData, int32_t numFrames) override {
mOutputStage->renderAudio(audioData, numFrames);
};
virtual ~Synth() {
}
private:
// Rendering objects
int32_t mNumSignals;
std::unique_ptr<SynthSound[]> mOscs;
Mixer mMixer;
MonoToStereo mConverter = MonoToStereo(&mMixer);
IRenderableAudio *mOutputStage; // This will point to either the mixer or converter, so it needs to be raw
};
#endif //SOUNDBOARD_SYNTH_H
|
