juce_MPEUtils.h

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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.
 
   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 MPEChannelAssigner
{
public:
    MPEChannelAssigner (MPEZoneLayout::Zone zoneToUse);

    MPEChannelAssigner (Range<int> channelRange = Range<int> (1, 17));

    int findMidiChannelForNewNote (int noteNumber) noexcept;

    int findMidiChannelForExistingNote (int initialNoteOnNumber) noexcept;

    void noteOff (int noteNumber, int midiChannel = -1);

    void allNotesOff();
 
private:
    bool isLegacy = false;
    std::unique_ptr<MPEZoneLayout::Zone> zone;
    int channelIncrement, numChannels, firstChannel, lastChannel, midiChannelLastAssigned;
 
    //==============================================================================
    struct MidiChannel
    {
        Array<int> notes;
        int lastNotePlayed = -1;
        bool isFree() const noexcept  { return notes.isEmpty(); }
    };
    std::array<MidiChannel, 17> midiChannels;
 
    //==============================================================================
    int findMidiChannelPlayingClosestNonequalNote (int noteNumber) noexcept;
};
 
//==============================================================================
class MPEChannelRemapper
{
public:
    static const uint32 notMPE = 0;

    MPEChannelRemapper (MPEZoneLayout::Zone zoneToRemap);
 
    //==============================================================================
    void remapMidiChannelIfNeeded (MidiMessage& message, uint32 mpeSourceID) noexcept;
 
    //==============================================================================
    void reset() noexcept;

    void clearChannel (int channel) noexcept;

    void clearSource (uint32 mpeSourceID);
 
private:
    MPEZoneLayout::Zone zone;
 
    int channelIncrement;
    int firstChannel, lastChannel;
 
    uint32 sourceAndChannel[17];
    uint32 lastUsed[17];
    uint32 counter = 0;
 
    //==============================================================================
    bool applyRemapIfExisting (int channel, uint32 sourceAndChannelID, MidiMessage& m) noexcept;
    int getBestChanToReuse() const noexcept;
 
    void zeroArrays();
 
    //==============================================================================
    bool messageIsNoteData (const MidiMessage& m)    { return (*m.getRawData() & 0xf0) != 0xf0; }
};
 
} // namespace juce