juce_DelayLine.cpp

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 /*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   JUCE is an open source library subject to commercial or open-source
   licensing.
 
   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.
 
   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy
 
   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).
 
   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.
 
  ==============================================================================
*/
 
namespace juce::dsp
{
 
//==============================================================================
template <typename SampleType, typename InterpolationType>
DelayLine<SampleType, InterpolationType>::DelayLine()
    : DelayLine (0)
{
}
 
template <typename SampleType, typename InterpolationType>
DelayLine<SampleType, InterpolationType>::DelayLine (int maximumDelayInSamples)
{
    jassert (maximumDelayInSamples >= 0);
 
    sampleRate = 44100.0;
 
    setMaximumDelayInSamples (maximumDelayInSamples);
}
 
//==============================================================================
template <typename SampleType, typename InterpolationType>
void DelayLine<SampleType, InterpolationType>::setDelay (SampleType newDelayInSamples)
{
    auto upperLimit = (SampleType) getMaximumDelayInSamples();
    jassert (isPositiveAndNotGreaterThan (newDelayInSamples, upperLimit));
 
    delay     = jlimit ((SampleType) 0, upperLimit, newDelayInSamples);
    delayInt  = static_cast<int> (std::floor (delay));
    delayFrac = delay - (SampleType) delayInt;
 
    updateInternalVariables();
}
 
template <typename SampleType, typename InterpolationType>
SampleType DelayLine<SampleType, InterpolationType>::getDelay() const
{
    return delay;
}
 
//==============================================================================
template <typename SampleType, typename InterpolationType>
void DelayLine<SampleType, InterpolationType>::prepare (const ProcessSpec& spec)
{
    jassert (spec.numChannels > 0);
 
    bufferData.setSize ((int) spec.numChannels, totalSize, false, false, true);
 
    writePos.resize (spec.numChannels);
    readPos.resize  (spec.numChannels);
 
    v.resize (spec.numChannels);
    sampleRate = spec.sampleRate;
 
    reset();
}
 
template <typename SampleType, typename InterpolationType>
void DelayLine<SampleType, InterpolationType>::setMaximumDelayInSamples (int maxDelayInSamples)
{
    jassert (maxDelayInSamples >= 0);
    totalSize = jmax (4, maxDelayInSamples + 2);
    bufferData.setSize ((int) bufferData.getNumChannels(), totalSize, false, false, true);
    reset();
}
 
template <typename SampleType, typename InterpolationType>
void DelayLine<SampleType, InterpolationType>::reset()
{
    for (auto vec : { &writePos, &readPos })
        std::fill (vec->begin(), vec->end(), 0);
 
    std::fill (v.begin(), v.end(), static_cast<SampleType> (0));
 
    bufferData.clear();
}
 
//==============================================================================
template <typename SampleType, typename InterpolationType>
void DelayLine<SampleType, InterpolationType>::pushSample (int channel, SampleType sample)
{
    bufferData.setSample (channel, writePos[(size_t) channel], sample);
    writePos[(size_t) channel] = (writePos[(size_t) channel] + totalSize - 1) % totalSize;
}
 
template <typename SampleType, typename InterpolationType>
SampleType DelayLine<SampleType, InterpolationType>::popSample (int channel, SampleType delayInSamples, bool updateReadPointer)
{
    if (delayInSamples >= 0)
        setDelay (delayInSamples);
 
    auto result = interpolateSample (channel);
 
    if (updateReadPointer)
        readPos[(size_t) channel] = (readPos[(size_t) channel] + totalSize - 1) % totalSize;
 
    return result;
}
 
//==============================================================================
template class DelayLine<float,  DelayLineInterpolationTypes::None>;
template class DelayLine<double, DelayLineInterpolationTypes::None>;
template class DelayLine<float,  DelayLineInterpolationTypes::Linear>;
template class DelayLine<double, DelayLineInterpolationTypes::Linear>;
template class DelayLine<float,  DelayLineInterpolationTypes::Lagrange3rd>;
template class DelayLine<double, DelayLineInterpolationTypes::Lagrange3rd>;
template class DelayLine<float,  DelayLineInterpolationTypes::Thiran>;
template class DelayLine<double, DelayLineInterpolationTypes::Thiran>;
 
} // namespace juce::dsp