OpenShot Audio Library | OpenShotAudio: juce_Gain.h Source File

OpenShot Audio Library | OpenShotAudio 1.0.0

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juce_Gain.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
34template <typename FloatType>
35 class Gain
36{
37public:
38 Gain() noexcept = default;
39
40 //==============================================================================
42 void setGainLinear (FloatType newGain) noexcept { gain.setTargetValue (newGain); }
43
45 void setGainDecibels (FloatType newGainDecibels) noexcept { setGainLinear (Decibels::decibelsToGain<FloatType> (newGainDecibels)); }
46
48 FloatType getGainLinear() const noexcept { return gain.getTargetValue(); }
49
51 FloatType getGainDecibels() const noexcept { return Decibels::gainToDecibels<FloatType> (getGainLinear()); }
52
54 void setRampDurationSeconds (double newDurationSeconds) noexcept
55 {
56 if (! approximatelyEqual (rampDurationSeconds, newDurationSeconds))
57 {
58 rampDurationSeconds = newDurationSeconds;
59 reset();
60 }
61 }
62
64 double getRampDurationSeconds() const noexcept { return rampDurationSeconds; }
65
67 bool isSmoothing() const noexcept { return gain.isSmoothing(); }
68
69 //==============================================================================
71 void prepare (const ProcessSpec& spec) noexcept
72 {
73 sampleRate = spec.sampleRate;
74 reset();
75 }
76
78 void reset() noexcept
79 {
80 if (sampleRate > 0)
81 gain.reset (sampleRate, rampDurationSeconds);
82 }
83
84 //==============================================================================
86 template <typename SampleType>
87 SampleType JUCE_VECTOR_CALLTYPE processSample (SampleType s) noexcept
88 {
89 return s * gain.getNextValue();
90 }
91
93 template <typename ProcessContext>
94 void process (const ProcessContext& context) noexcept
95 {
96 auto&& inBlock = context.getInputBlock();
97 auto&& outBlock = context.getOutputBlock();
98
99 jassert (inBlock.getNumChannels() == outBlock.getNumChannels());
100 jassert (inBlock.getNumSamples() == outBlock.getNumSamples());
101
102 auto len = inBlock.getNumSamples();
103 auto numChannels = inBlock.getNumChannels();
104
105 if (context.isBypassed)
106 {
107 gain.skip (static_cast<int> (len));
108
109 if (context.usesSeparateInputAndOutputBlocks())
110 outBlock.copyFrom (inBlock);
111
112 return;
113 }
114
115 if (numChannels == 1)
116 {
117 auto* src = inBlock.getChannelPointer (0);
118 auto* dst = outBlock.getChannelPointer (0);
119
120 for (size_t i = 0; i < len; ++i)
121 dst[i] = src[i] * gain.getNextValue();
122 }
123 else
124 {
125 JUCE_BEGIN_IGNORE_WARNINGS_MSVC (6255 6386)
126 auto* gains = static_cast<FloatType*> (alloca (sizeof (FloatType) * len));
127
128 for (size_t i = 0; i < len; ++i)
129 gains[i] = gain.getNextValue();
130 JUCE_END_IGNORE_WARNINGS_MSVC
131
132 for (size_t chan = 0; chan < numChannels; ++chan)
133 FloatVectorOperations::multiply (outBlock.getChannelPointer (chan),
134 inBlock.getChannelPointer (chan),
135 gains, static_cast<int> (len));
136 }
137 }
138
139private:
140 //==============================================================================
141 SmoothedValue<FloatType> gain;
142 double sampleRate = 0, rampDurationSeconds = 0;
143};
144
145} // namespace juce::dsp
juce::Decibels::decibelsToGain
static Type decibelsToGain(Type decibels, Type minusInfinityDb=Type(defaultMinusInfinitydB))
Definition juce_Decibels.h:42
juce::Decibels::gainToDecibels
static Type gainToDecibels(Type gain, Type minusInfinityDb=Type(defaultMinusInfinitydB))
Definition juce_Decibels.h:56
juce::SmoothedValue
Definition juce_SmoothedValue.h:227
juce::dsp::Gain::getGainDecibels
FloatType getGainDecibels() const noexcept
Definition juce_Gain.h:51
juce::dsp::Gain::getGainLinear
FloatType getGainLinear() const noexcept
Definition juce_Gain.h:48
juce::dsp::Gain::prepare
void prepare(const ProcessSpec &spec) noexcept
Definition juce_Gain.h:71
juce::dsp::Gain::getRampDurationSeconds
double getRampDurationSeconds() const noexcept
Definition juce_Gain.h:64
juce::dsp::Gain::isSmoothing
bool isSmoothing() const noexcept
Definition juce_Gain.h:67
juce::dsp::Gain::setGainLinear
void setGainLinear(FloatType newGain) noexcept
Definition juce_Gain.h:42
juce::dsp::Gain::processSample
SampleType JUCE_VECTOR_CALLTYPE processSample(SampleType s) noexcept
Definition juce_Gain.h:87
juce::dsp::Gain::reset
void reset() noexcept
Definition juce_Gain.h:78
juce::dsp::Gain::process
void process(const ProcessContext &context) noexcept
Definition juce_Gain.h:94
juce::dsp::Gain::setRampDurationSeconds
void setRampDurationSeconds(double newDurationSeconds) noexcept
Definition juce_Gain.h:54
juce::dsp::Gain::setGainDecibels
void setGainDecibels(FloatType newGainDecibels) noexcept
Definition juce_Gain.h:45
juce::dsp::ProcessSpec
Definition juce_ProcessContext.h:36