OpenShot Audio Library | OpenShotAudio 0.3.2

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juce_Gain.h
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2017 - ROLI Ltd.
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 5 End-User License
11 Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
12 27th April 2017).
13
14 End User License Agreement: www.juce.com/juce-5-licence
15 Privacy Policy: www.juce.com/juce-5-privacy-policy
16
17 Or: You may also use this code under the terms of the GPL v3 (see
18 www.gnu.org/licenses).
19
20 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
21 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
22 DISCLAIMED.
23
24 ==============================================================================
25*/
26
27 namespace juce
28{
29 namespace dsp
30{
31
37 template <typename FloatType>
38 class Gain
39{
40 public:
41 Gain() noexcept = default;
42
43 //==============================================================================
45 void setGainLinear (FloatType newGain) noexcept { gain.setTargetValue (newGain); }
46
48 void setGainDecibels (FloatType newGainDecibels) noexcept { setGainLinear (Decibels::decibelsToGain<FloatType> (newGainDecibels)); }
49
51 FloatType getGainLinear() const noexcept { return gain.getTargetValue(); }
52
54 FloatType getGainDecibels() const noexcept { return Decibels::gainToDecibels<FloatType> (getGainLinear()); }
55
57 void setRampDurationSeconds (double newDurationSeconds) noexcept
58 {
59 if (rampDurationSeconds != newDurationSeconds)
60 {
61 rampDurationSeconds = newDurationSeconds;
62 reset();
63 }
64 }
65
67 double getRampDurationSeconds() const noexcept { return rampDurationSeconds; }
68
70 bool isSmoothing() const noexcept { return gain.isSmoothing(); }
71
72 //==============================================================================
74 void prepare (const ProcessSpec& spec) noexcept
75 {
76 sampleRate = spec.sampleRate;
77 reset();
78 }
79
81 void reset() noexcept
82 {
83 if (sampleRate > 0)
84 gain.reset (sampleRate, rampDurationSeconds);
85 }
86
87 //==============================================================================
89 template <typename SampleType>
90 SampleType JUCE_VECTOR_CALLTYPE processSample (SampleType s) noexcept
91 {
92 return s * gain.getNextValue();
93 }
94
96 template <typename ProcessContext>
97 void process (const ProcessContext& context) noexcept
98 {
99 auto&& inBlock = context.getInputBlock();
100 auto&& outBlock = context.getOutputBlock();
101
102 jassert (inBlock.getNumChannels() == outBlock.getNumChannels());
103 jassert (inBlock.getNumSamples() == outBlock.getNumSamples());
104
105 auto len = inBlock.getNumSamples();
106 auto numChannels = inBlock.getNumChannels();
107
108 if (context.isBypassed)
109 {
110 gain.skip (static_cast<int> (len));
111
112 if (context.usesSeparateInputAndOutputBlocks())
113 outBlock.copyFrom (inBlock);
114
115 return;
116 }
117
118 if (numChannels == 1)
119 {
120 auto* src = inBlock.getChannelPointer (0);
121 auto* dst = outBlock.getChannelPointer (0);
122
123 for (size_t i = 0; i < len; ++i)
124 dst[i] = src[i] * gain.getNextValue();
125 }
126 else
127 {
128 auto* gains = static_cast<FloatType*> (alloca (sizeof (FloatType) * len));
129
130 for (size_t i = 0; i < len; ++i)
131 gains[i] = gain.getNextValue();
132
133 for (size_t chan = 0; chan < numChannels; ++chan)
134 FloatVectorOperations::multiply (outBlock.getChannelPointer (chan),
135 inBlock.getChannelPointer (chan),
136 gains, static_cast<int> (len));
137 }
138 }
139
140 private:
141 //==============================================================================
142 SmoothedValue<FloatType> gain;
143 double sampleRate = 0, rampDurationSeconds = 0;
144};
145
146} // namespace dsp
147} // namespace juce
juce::FloatVectorOperations::multiply
static void JUCE_CALLTYPE multiply(float *dest, const float *src, int numValues) noexcept
Definition: juce_FloatVectorOperations.cpp:754
juce::SmoothedValue
Definition: juce_SmoothedValue.h:229
juce::dsp::Gain
Definition: juce_Gain.h:39
juce::dsp::Gain::getGainDecibels
FloatType getGainDecibels() const noexcept
Definition: juce_Gain.h:54
juce::dsp::Gain::getGainLinear
FloatType getGainLinear() const noexcept
Definition: juce_Gain.h:51
juce::dsp::Gain::prepare
void prepare(const ProcessSpec &spec) noexcept
Definition: juce_Gain.h:74
juce::dsp::Gain::getRampDurationSeconds
double getRampDurationSeconds() const noexcept
Definition: juce_Gain.h:67
juce::dsp::Gain::isSmoothing
bool isSmoothing() const noexcept
Definition: juce_Gain.h:70
juce::dsp::Gain::setGainLinear
void setGainLinear(FloatType newGain) noexcept
Definition: juce_Gain.h:45
juce::dsp::Gain::processSample
SampleType JUCE_VECTOR_CALLTYPE processSample(SampleType s) noexcept
Definition: juce_Gain.h:90
juce::dsp::Gain::reset
void reset() noexcept
Definition: juce_Gain.h:81
juce::dsp::Gain::process
void process(const ProcessContext &context) noexcept
Definition: juce_Gain.h:97
juce::dsp::Gain::setRampDurationSeconds
void setRampDurationSeconds(double newDurationSeconds) noexcept
Definition: juce_Gain.h:57
juce::dsp::Gain::setGainDecibels
void setGainDecibels(FloatType newGainDecibels) noexcept
Definition: juce_Gain.h:48
juce::dsp::ProcessSpec
Definition: juce_ProcessContext.h:39