JUCE/modules/juce_audio_basics/mpe/juce_MPESynthesiserBase.cpp

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

   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.

   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3

   Details of these licenses can be found at: www.gnu.org/licenses

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

   ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.

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

MPESynthesiserBase::MPESynthesiserBase()
    : instrument (new MPEInstrument),
      sampleRate (0),
      minimumSubBlockSize (32)
{
    instrument->addListener (this);
}

MPESynthesiserBase::MPESynthesiserBase (MPEInstrument* inst)
    : instrument (inst),
      sampleRate (0),
      minimumSubBlockSize (32)
{
    jassert (instrument != nullptr);
    instrument->addListener (this);
}

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

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

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

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

//==============================================================================
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);

    MidiBuffer::Iterator midiIterator (inputMidi);
    midiIterator.setNextSamplePosition (startSample);

    int midiEventPos;
    MidiMessage m;

    const ScopedLock sl (renderAudioLock);

    while (numSamples > 0)
    {
        if (! midiIterator.getNextEvent (m, midiEventPos))
        {
            renderNextSubBlock (outputAudio, startSample, numSamples);
            return;
        }

        const int samplesToNextMidiMessage = midiEventPos - startSample;

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

        if (samplesToNextMidiMessage < minimumSubBlockSize)
        {
            handleMidiEvent (m);
            continue;
        }

        renderNextSubBlock (outputAudio, startSample, samplesToNextMidiMessage);
        handleMidiEvent (m);
        startSample += samplesToNextMidiMessage;
        numSamples  -= samplesToNextMidiMessage;
    }

    while (midiIterator.getNextEvent (m, midiEventPos))
        handleMidiEvent (m);
}

// 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 (renderAudioLock);
        instrument->releaseAllNotes();
        sampleRate = newRate;
    }
}

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