OpenShot Audio Library | OpenShotAudio 0.4.0

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juce_Chorus.h
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 By using JUCE, you agree to the terms of both the JUCE 7 End-User License
11 Agreement and JUCE Privacy Policy.
12
13 End User License Agreement: www.juce.com/juce-7-licence
14 Privacy Policy: www.juce.com/juce-privacy-policy
15
16 Or: You may also use this code under the terms of the GPL v3 (see
17 www.gnu.org/licenses).
18
19 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
20 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
21 DISCLAIMED.
22
23 ==============================================================================
24*/
25
26 namespace juce::dsp
27{
28
44 template <typename SampleType>
45 class Chorus
46{
47 public:
48 //==============================================================================
50 Chorus();
51
52 //==============================================================================
56 void setRate (SampleType newRateHz);
57
60 void setDepth (SampleType newDepth);
61
65 void setCentreDelay (SampleType newDelayMs);
66
70 void setFeedback (SampleType newFeedback);
71
75 void setMix (SampleType newMix);
76
77 //==============================================================================
79 void prepare (const ProcessSpec& spec);
80
82 void reset();
83
84 //==============================================================================
86 template <typename ProcessContext>
87 void process (const ProcessContext& context) noexcept
88 {
89 const auto& inputBlock = context.getInputBlock();
90 auto& outputBlock = context.getOutputBlock();
91 const auto numChannels = outputBlock.getNumChannels();
92 const auto numSamples = outputBlock.getNumSamples();
93
94 jassert (inputBlock.getNumChannels() == numChannels);
95 jassert (inputBlock.getNumChannels() == lastOutput.size());
96 jassert (inputBlock.getNumSamples() == numSamples);
97
98 if (context.isBypassed)
99 {
100 outputBlock.copyFrom (inputBlock);
101 return;
102 }
103
104 auto delayValuesBlock = AudioBlock<SampleType> (bufferDelayTimes).getSubBlock (0, numSamples);
105 auto contextDelay = ProcessContextReplacing<SampleType> (delayValuesBlock);
106 delayValuesBlock.clear();
107
108 osc.process (contextDelay);
109 delayValuesBlock.multiplyBy (oscVolume);
110
111 auto* delaySamples = bufferDelayTimes.getWritePointer (0);
112
113 for (size_t i = 0; i < numSamples; ++i)
114 {
115 auto lfo = jmax (static_cast<SampleType> (1.0), maximumDelayModulation * delaySamples[i] + centreDelay);
116 delaySamples[i] = static_cast<SampleType> (lfo * sampleRate / 1000.0);
117 }
118
119 dryWet.pushDrySamples (inputBlock);
120
121 for (size_t channel = 0; channel < numChannels; ++channel)
122 {
123 auto* inputSamples = inputBlock .getChannelPointer (channel);
124 auto* outputSamples = outputBlock.getChannelPointer (channel);
125
126 for (size_t i = 0; i < numSamples; ++i)
127 {
128 auto input = inputSamples[i];
129 auto output = input - lastOutput[channel];
130
131 delay.pushSample ((int) channel, output);
132 delay.setDelay (delaySamples[i]);
133 output = delay.popSample ((int) channel);
134
135 outputSamples[i] = output;
136 lastOutput[channel] = output * feedbackVolume[channel].getNextValue();
137 }
138 }
139
140 dryWet.mixWetSamples (outputBlock);
141 }
142
143 private:
144 //==============================================================================
145 void update();
146
147 //==============================================================================
148 Oscillator<SampleType> osc;
149 DelayLine<SampleType, DelayLineInterpolationTypes::Linear> delay;
150 SmoothedValue<SampleType, ValueSmoothingTypes::Linear> oscVolume;
151 std::vector<SmoothedValue<SampleType, ValueSmoothingTypes::Linear>> feedbackVolume { 2 };
152 DryWetMixer<SampleType> dryWet;
153 std::vector<SampleType> lastOutput { 2 };
154 AudioBuffer<SampleType> bufferDelayTimes;
155
156 double sampleRate = 44100.0;
157 SampleType rate = 1.0, depth = 0.25, feedback = 0.0, mix = 0.5,
158 centreDelay = 7.0;
159
160 static constexpr SampleType maxDepth = 1.0,
161 maxCentreDelayMs = 100.0,
162 oscVolumeMultiplier = 0.5,
163 maximumDelayModulation = 20.0;
164};
165
166} // namespace juce::dsp
juce::AudioBuffer::getWritePointer
Type * getWritePointer(int channelNumber) noexcept
Definition juce_AudioSampleBuffer.h:291
juce::SmoothedValue
Definition juce_SmoothedValue.h:227
juce::dsp::AudioBlock
Definition juce_AudioBlock.h:68
juce::dsp::AudioBlock::getSubBlock
AudioBlock getSubBlock(size_t newOffset, size_t newLength) const noexcept
Definition juce_AudioBlock.h:369
juce::dsp::Chorus
Definition juce_Chorus.h:46
juce::dsp::Chorus::setFeedback
void setFeedback(SampleType newFeedback)
Definition juce_Chorus.cpp:66
juce::dsp::Chorus::setDepth
void setDepth(SampleType newDepth)
Definition juce_Chorus.cpp:49
juce::dsp::Chorus::prepare
void prepare(const ProcessSpec &spec)
Definition juce_Chorus.cpp:85
juce::dsp::Chorus::setMix
void setMix(SampleType newMix)
Definition juce_Chorus.cpp:75
juce::dsp::Chorus::reset
void reset()
Definition juce_Chorus.cpp:109
juce::dsp::Chorus::process
void process(const ProcessContext &context) noexcept
Definition juce_Chorus.h:87
juce::dsp::Chorus::Chorus
Chorus()
Definition juce_Chorus.cpp:31
juce::dsp::Chorus::setRate
void setRate(SampleType newRateHz)
Definition juce_Chorus.cpp:40
juce::dsp::Chorus::setCentreDelay
void setCentreDelay(SampleType newDelayMs)
Definition juce_Chorus.cpp:58
juce::dsp::DelayLine
Definition juce_DelayLine.h:93
juce::dsp::Oscillator
Definition juce_Oscillator.h:36
juce::dsp::ProcessContextReplacing
Definition juce_ProcessContext.h:89
juce::dsp::ProcessSpec
Definition juce_ProcessContext.h:36