Carla/source/modules/juce_audio_basics/mpe/juce_MPESynthesiserBase.cpp

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2020 - Raw Material Software Limited

   JUCE is an open source library subject to commercial or open-source
   licensing.

   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
   To use, copy, modify, and/or distribute this software for any purpose with or
   without fee is hereby granted provided that the above copyright notice and
   this permission notice appear in all copies.

   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
{

MPESynthesiserBase::MPESynthesiserBase()
    : instrument (new MPEInstrument)
{
    instrument->addListener (this);
}

MPESynthesiserBase::MPESynthesiserBase (MPEInstrument* inst)
    : instrument (inst)
{
    jassert (instrument != nullptr);
    instrument->addListener (this);
}

//==============================================================================
MPEZoneLayout MPESynthesiserBase::getZoneLayout() const noexcept
{
    return instrument->getZoneLayout();
}

void MPESynthesiserBase::setZoneLayout (MPEZoneLayout newLayout)
{
    instrument->setZoneLayout (newLayout);
}

//==============================================================================
void MPESynthesiserBase::enableLegacyMode (int pitchbendRange, Range<int> channelRange)
{
    instrument->enableLegacyMode (pitchbendRange, channelRange);
}

bool MPESynthesiserBase::isLegacyModeEnabled() const noexcept
{
    return instrument->isLegacyModeEnabled();
}

Range<int> MPESynthesiserBase::getLegacyModeChannelRange() const noexcept
{
    return instrument->getLegacyModeChannelRange();
}

void MPESynthesiserBase::setLegacyModeChannelRange (Range<int> channelRange)
{
    instrument->setLegacyModeChannelRange (channelRange);
}

int MPESynthesiserBase::getLegacyModePitchbendRange() const noexcept
{
    return instrument->getLegacyModePitchbendRange();
}

void MPESynthesiserBase::setLegacyModePitchbendRange (int pitchbendRange)
{
    instrument->setLegacyModePitchbendRange (pitchbendRange);
}

//==============================================================================
void MPESynthesiserBase::setPressureTrackingMode (TrackingMode modeToUse)
{
    instrument->setPressureTrackingMode (modeToUse);
}

void MPESynthesiserBase::setPitchbendTrackingMode (TrackingMode modeToUse)
{
    instrument->setPitchbendTrackingMode (modeToUse);
}

void MPESynthesiserBase::setTimbreTrackingMode (TrackingMode modeToUse)
{
    instrument->setTimbreTrackingMode (modeToUse);
}

//==============================================================================
void MPESynthesiserBase::handleMidiEvent (const MidiMessage& m)
{
    instrument->processNextMidiEvent (m);
}

//==============================================================================
template <typename floatType>
void MPESynthesiserBase::renderNextBlock (AudioBuffer<floatType>& outputAudio,
                                          const MidiBuffer& inputMidi,
                                          int startSample,
                                          int numSamples)
{
    // you must set the sample rate before using this!
    jassert (sampleRate != 0);

    auto midiIterator = inputMidi.findNextSamplePosition (startSample);

    bool firstEvent = true;

    const ScopedLock sl (noteStateLock);

    for (; numSamples > 0; ++midiIterator)
    {
        if (midiIterator == inputMidi.cend())
        {
            renderNextSubBlock (outputAudio, startSample, numSamples);
            return;
        }

        const auto metadata = *midiIterator;
        auto samplesToNextMidiMessage = metadata.samplePosition - startSample;

        if (samplesToNextMidiMessage >= numSamples)
        {
            renderNextSubBlock (outputAudio, startSample, numSamples);
            handleMidiEvent (metadata.getMessage());
            break;
        }

        if (samplesToNextMidiMessage < ((firstEvent && ! subBlockSubdivisionIsStrict) ? 1 : minimumSubBlockSize))
        {
            handleMidiEvent (metadata.getMessage());
            continue;
        }

        firstEvent = false;

        renderNextSubBlock (outputAudio, startSample, samplesToNextMidiMessage);
        handleMidiEvent (metadata.getMessage());
        startSample += samplesToNextMidiMessage;
        numSamples  -= samplesToNextMidiMessage;
    }

    std::for_each (midiIterator,
                   inputMidi.cend(),
                   [&] (const MidiMessageMetadata& meta) { handleMidiEvent (meta.getMessage()); });
}

// explicit instantiation for supported float types:
template void MPESynthesiserBase::renderNextBlock<float> (AudioBuffer<float>&, const MidiBuffer&, int, int);
template void MPESynthesiserBase::renderNextBlock<double> (AudioBuffer<double>&, const MidiBuffer&, int, int);

//==============================================================================
void MPESynthesiserBase::setCurrentPlaybackSampleRate (const double newRate)
{
    if (sampleRate != newRate)
    {
        const ScopedLock sl (noteStateLock);
        instrument->releaseAllNotes();
        sampleRate = newRate;
    }
}

//==============================================================================
void MPESynthesiserBase::setMinimumRenderingSubdivisionSize (int numSamples, bool shouldBeStrict) noexcept
{
    jassert (numSamples > 0); // it wouldn't make much sense for this to be less than 1
    minimumSubBlockSize = numSamples;
    subBlockSubdivisionIsStrict = shouldBeStrict;
}

} // namespace juce