juce_MPESynthesiser.h

/*
  ==============================================================================
 
   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.
 
   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
{
 
//==============================================================================
class JUCE_API  MPESynthesiser   : public MPESynthesiserBase
{
public:
    //==============================================================================
    MPESynthesiser();

    MPESynthesiser (MPEInstrument& instrumentToUse);

    ~MPESynthesiser() override;
 
    //==============================================================================
    void clearVoices();

    int getNumVoices() const noexcept                               { return voices.size(); }

    MPESynthesiserVoice* getVoice (int index) const;

    void addVoice (MPESynthesiserVoice* newVoice);

    void removeVoice (int index);

    void reduceNumVoices (int newNumVoices);

    virtual void turnOffAllVoices (bool allowTailOff);
 
    //==============================================================================
    void setVoiceStealingEnabled (bool shouldSteal) noexcept    { shouldStealVoices = shouldSteal; }

    bool isVoiceStealingEnabled() const noexcept                { return shouldStealVoices; }
 
    //==============================================================================
    void setCurrentPlaybackSampleRate (double newRate) override;
 
    //==============================================================================
    void handleMidiEvent (const MidiMessage&) override;

    virtual void handleController (int /*midiChannel*/,
                                   int /*controllerNumber*/,
                                   int /*controllerValue*/) {}

    virtual void handleProgramChange (int /*midiChannel*/,
                                      int /*programNumber*/) {}
 
protected:
    //==============================================================================
    void noteAdded (MPENote newNote) override;

    void noteReleased (MPENote finishedNote) override;

    void notePressureChanged (MPENote changedNote) override;

    void notePitchbendChanged (MPENote changedNote) override;

    void noteTimbreChanged (MPENote changedNote) override;

    void noteKeyStateChanged (MPENote changedNote) override;
 
    //==============================================================================
    void renderNextSubBlock (AudioBuffer<float>& outputAudio,
                             int startSample,
                             int numSamples) override;

    void renderNextSubBlock (AudioBuffer<double>& outputAudio,
                             int startSample,
                             int numSamples) override;
 
    //==============================================================================
    virtual MPESynthesiserVoice* findFreeVoice (MPENote noteToFindVoiceFor,
                                                bool stealIfNoneAvailable) const;

    virtual MPESynthesiserVoice* findVoiceToSteal (MPENote noteToStealVoiceFor = MPENote()) const;

    void startVoice (MPESynthesiserVoice* voice, MPENote noteToStart);

    void stopVoice (MPESynthesiserVoice* voice, MPENote noteToStop, bool allowTailOff);
 
    //==============================================================================
    OwnedArray<MPESynthesiserVoice> voices;
    CriticalSection voicesLock;
 
private:
    //==============================================================================
    std::atomic<bool> shouldStealVoices { false };
    uint32 lastNoteOnCounter = 0;
    mutable CriticalSection stealLock;
    mutable Array<MPESynthesiserVoice*> usableVoicesToStealArray;
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MPESynthesiser)
};
 
} // namespace juce