OpenShot Audio Library | OpenShotAudio: juce_FirstOrderTPTFilter.h Source File

OpenShot Audio Library | OpenShotAudio 0.4.0

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juce_FirstOrderTPTFilter.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
26namespace juce::dsp
27{
28
29enum class FirstOrderTPTFilterType
30{
31 lowpass,
32 highpass,
33 allpass
34};
35
36//==============================================================================
52template <typename SampleType>
53 class FirstOrderTPTFilter
54{
55public:
56 //==============================================================================
57 using Type = FirstOrderTPTFilterType;
58
59 //==============================================================================
61 FirstOrderTPTFilter();
62
63 //==============================================================================
65 void setType (Type newType);
66
71 void setCutoffFrequency (SampleType newFrequencyHz);
72
73 //==============================================================================
75 Type getType() const noexcept { return filterType; }
76
78 SampleType getCutoffFrequency() const noexcept { return cutoffFrequency; }
79
80 //==============================================================================
82 void prepare (const ProcessSpec& spec);
83
85 void reset();
86
88 void reset (SampleType newValue);
89
90 //==============================================================================
92 template <typename ProcessContext>
93 void process (const ProcessContext& context) noexcept
94 {
95 const auto& inputBlock = context.getInputBlock();
96 auto& outputBlock = context.getOutputBlock();
97 const auto numChannels = outputBlock.getNumChannels();
98 const auto numSamples = outputBlock.getNumSamples();
99
100 jassert (inputBlock.getNumChannels() <= s1.size());
101 jassert (inputBlock.getNumChannels() == numChannels);
102 jassert (inputBlock.getNumSamples() == numSamples);
103
104 if (context.isBypassed)
105 {
106 outputBlock.copyFrom (inputBlock);
107 return;
108 }
109
110 for (size_t channel = 0; channel < numChannels; ++channel)
111 {
112 auto* inputSamples = inputBlock .getChannelPointer (channel);
113 auto* outputSamples = outputBlock.getChannelPointer (channel);
114
115 for (size_t i = 0; i < numSamples; ++i)
116 outputSamples[i] = processSample ((int) channel, inputSamples[i]);
117 }
118
119 #if JUCE_DSP_ENABLE_SNAP_TO_ZERO
120 snapToZero();
121 #endif
122 }
123
124 //==============================================================================
126 SampleType processSample (int channel, SampleType inputValue);
127
132 void snapToZero() noexcept;
133
134private:
135 //==============================================================================
136 void update();
137
138 //==============================================================================
139 SampleType G = 0;
140 std::vector<SampleType> s1 { 2 };
141 double sampleRate = 44100.0;
142
143 //==============================================================================
144 Type filterType = Type::lowpass;
145 SampleType cutoffFrequency = 1000.0;
146};
147
148} // namespace juce::dsp
juce::dsp::FirstOrderTPTFilter
Definition juce_FirstOrderTPTFilter.h:54
juce::dsp::FirstOrderTPTFilter::getType
Type getType() const noexcept
Definition juce_FirstOrderTPTFilter.h:75
juce::dsp::FirstOrderTPTFilter::getCutoffFrequency
SampleType getCutoffFrequency() const noexcept
Definition juce_FirstOrderTPTFilter.h:78
juce::dsp::FirstOrderTPTFilter::prepare
void prepare(const ProcessSpec &spec)
Definition juce_FirstOrderTPTFilter.cpp:54
juce::dsp::FirstOrderTPTFilter::snapToZero
void snapToZero() noexcept
Definition juce_FirstOrderTPTFilter.cpp:101
juce::dsp::FirstOrderTPTFilter::processSample
SampleType processSample(int channel, SampleType inputValue)
Definition juce_FirstOrderTPTFilter.cpp:80
juce::dsp::FirstOrderTPTFilter::FirstOrderTPTFilter
FirstOrderTPTFilter()
Definition juce_FirstOrderTPTFilter.cpp:31
juce::dsp::FirstOrderTPTFilter::process
void process(const ProcessContext &context) noexcept
Definition juce_FirstOrderTPTFilter.h:93
juce::dsp::FirstOrderTPTFilter::setType
void setType(Type newType)
Definition juce_FirstOrderTPTFilter.cpp:38
juce::dsp::FirstOrderTPTFilter::setCutoffFrequency
void setCutoffFrequency(SampleType newFrequencyHz)
Definition juce_FirstOrderTPTFilter.cpp:44
juce::dsp::FirstOrderTPTFilter::reset
void reset()
Definition juce_FirstOrderTPTFilter.cpp:67
juce::dsp::ProcessSpec
Definition juce_ProcessContext.h:36