OpenShot Audio Library | OpenShotAudio  0.3.3
juce_Bias.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 
43 template <typename FloatType>
44 class Bias
45 {
46 public:
47  Bias() noexcept = default;
48 
49  //==============================================================================
53  void setBias (FloatType newBias) noexcept
54  {
55  jassert (newBias >= static_cast<FloatType> (-1) && newBias <= static_cast<FloatType> (1));
56  bias.setTargetValue (newBias);
57  }
58 
59  //==============================================================================
63  FloatType getBias() const noexcept { return bias.getTargetValue(); }
64 
66  void setRampDurationSeconds (double newDurationSeconds) noexcept
67  {
68  if (rampDurationSeconds != newDurationSeconds)
69  {
70  rampDurationSeconds = newDurationSeconds;
71  updateRamp();
72  }
73  }
74 
75  double getRampDurationSeconds() const noexcept { return rampDurationSeconds; }
76 
77  //==============================================================================
79  void prepare (const ProcessSpec& spec) noexcept
80  {
81  sampleRate = spec.sampleRate;
82  updateRamp();
83  }
84 
85  void reset() noexcept
86  {
87  bias.reset (sampleRate, rampDurationSeconds);
88  }
89 
90  //==============================================================================
92  template <typename SampleType>
93  SampleType processSample (SampleType inputSample) const noexcept
94  {
95  return inputSample + bias.getNextValue();
96  }
97 
98  //==============================================================================
100  template<typename ProcessContext>
101  void process (const ProcessContext& context) noexcept
102  {
103  auto&& inBlock = context.getInputBlock();
104  auto&& outBlock = context.getOutputBlock();
105 
106  jassert (inBlock.getNumChannels() == outBlock.getNumChannels());
107  jassert (inBlock.getNumSamples() == outBlock.getNumSamples());
108 
109  auto len = inBlock.getNumSamples();
110  auto numChannels = inBlock.getNumChannels();
111 
112  if (context.isBypassed)
113  {
114  bias.skip (static_cast<int> (len));
115 
116  if (context.usesSeparateInputAndOutputBlocks())
117  outBlock.copyFrom (inBlock);
118 
119  return;
120  }
121 
122  if (numChannels == 1)
123  {
124  auto* src = inBlock.getChannelPointer (0);
125  auto* dst = outBlock.getChannelPointer (0);
126 
127  for (size_t i = 0; i < len; ++i)
128  dst[i] = src[i] + bias.getNextValue();
129  }
130  else
131  {
132  auto* biases = static_cast<FloatType*> (alloca (sizeof (FloatType) * len));
133 
134  for (size_t i = 0; i < len; ++i)
135  biases[i] = bias.getNextValue();
136 
137  for (size_t chan = 0; chan < numChannels; ++chan)
138  FloatVectorOperations::add (outBlock.getChannelPointer (chan),
139  inBlock.getChannelPointer (chan),
140  biases, static_cast<int> (len));
141  }
142  }
143 
144 
145 private:
146  //==============================================================================
148  double sampleRate = 0, rampDurationSeconds = 0;
149 
150  void updateRamp() noexcept
151  {
152  if (sampleRate > 0)
153  bias.reset (sampleRate, rampDurationSeconds);
154  }
155 };
156 
157 } // namespace dsp
158 } // namespace juce
static void JUCE_CALLTYPE add(float *dest, float amountToAdd, int numValues) noexcept
void reset(double sampleRate, double rampLengthInSeconds) noexcept
FloatType getBias() const noexcept
Definition: juce_Bias.h:63
void prepare(const ProcessSpec &spec) noexcept
Definition: juce_Bias.h:79
SampleType processSample(SampleType inputSample) const noexcept
Definition: juce_Bias.h:93
void setRampDurationSeconds(double newDurationSeconds) noexcept
Definition: juce_Bias.h:66
void setBias(FloatType newBias) noexcept
Definition: juce_Bias.h:53
void process(const ProcessContext &context) noexcept
Definition: juce_Bias.h:101