JUCE/modules/juce_audio_basics/midi/juce_MidiKeyboardState.cpp

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

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

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   You may also use this code under the terms of the AGPLv3:
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  ==============================================================================
*/

namespace juce
{

MidiKeyboardState::MidiKeyboardState()
{
    zerostruct (noteStates);
}

//==============================================================================
void MidiKeyboardState::reset()
{
    const ScopedLock sl (lock);
    zerostruct (noteStates);
    eventsToAdd.clear();
}

bool MidiKeyboardState::isNoteOn (const int midiChannel, const int n) const noexcept
{
    jassert (midiChannel > 0 && midiChannel <= 16);

    return isPositiveAndBelow (n, 128)
            && (noteStates[n] & (1 << (midiChannel - 1))) != 0;
}

bool MidiKeyboardState::isNoteOnForChannels (const int midiChannelMask, const int n) const noexcept
{
    return isPositiveAndBelow (n, 128)
            && (noteStates[n] & midiChannelMask) != 0;
}

void MidiKeyboardState::noteOn (const int midiChannel, const int midiNoteNumber, const float velocity)
{
    jassert (midiChannel > 0 && midiChannel <= 16);
    jassert (isPositiveAndBelow (midiNoteNumber, 128));

    const ScopedLock sl (lock);

    if (isPositiveAndBelow (midiNoteNumber, 128))
    {
        const int timeNow = (int) Time::getMillisecondCounter();
        eventsToAdd.addEvent (MidiMessage::noteOn (midiChannel, midiNoteNumber, velocity), timeNow);
        eventsToAdd.clear (0, timeNow - 500);

        noteOnInternal (midiChannel, midiNoteNumber, velocity);
    }
}

void MidiKeyboardState::noteOnInternal  (const int midiChannel, const int midiNoteNumber, const float velocity)
{
    if (isPositiveAndBelow (midiNoteNumber, 128))
    {
        noteStates[midiNoteNumber] = static_cast<uint16> (noteStates[midiNoteNumber] | (1 << (midiChannel - 1)));
        listeners.call ([&] (Listener& l) { l.handleNoteOn (this, midiChannel, midiNoteNumber, velocity); });
    }
}

void MidiKeyboardState::noteOff (const int midiChannel, const int midiNoteNumber, const float velocity)
{
    const ScopedLock sl (lock);

    if (isNoteOn (midiChannel, midiNoteNumber))
    {
        const int timeNow = (int) Time::getMillisecondCounter();
        eventsToAdd.addEvent (MidiMessage::noteOff (midiChannel, midiNoteNumber), timeNow);
        eventsToAdd.clear (0, timeNow - 500);

        noteOffInternal (midiChannel, midiNoteNumber, velocity);
    }
}

void MidiKeyboardState::noteOffInternal  (const int midiChannel, const int midiNoteNumber, const float velocity)
{
    if (isNoteOn (midiChannel, midiNoteNumber))
    {
        noteStates[midiNoteNumber] = static_cast<uint16> (noteStates[midiNoteNumber] & ~(1 << (midiChannel - 1)));
        listeners.call ([&] (Listener& l) { l.handleNoteOff (this, midiChannel, midiNoteNumber, velocity); });
    }
}

void MidiKeyboardState::allNotesOff (const int midiChannel)
{
    const ScopedLock sl (lock);

    if (midiChannel <= 0)
    {
        for (int i = 1; i <= 16; ++i)
            allNotesOff (i);
    }
    else
    {
        for (int i = 0; i < 128; ++i)
            noteOff (midiChannel, i, 0.0f);
    }
}

void MidiKeyboardState::processNextMidiEvent (const MidiMessage& message)
{
    if (message.isNoteOn())
    {
        noteOnInternal (message.getChannel(), message.getNoteNumber(), message.getFloatVelocity());
    }
    else if (message.isNoteOff())
    {
        noteOffInternal (message.getChannel(), message.getNoteNumber(), message.getFloatVelocity());
    }
    else if (message.isAllNotesOff())
    {
        for (int i = 0; i < 128; ++i)
            noteOffInternal (message.getChannel(), i, 0.0f);
    }
}

void MidiKeyboardState::processNextMidiBuffer (MidiBuffer& buffer,
                                               const int startSample,
                                               const int numSamples,
                                               const bool injectIndirectEvents)
{
    const ScopedLock sl (lock);

    for (const auto metadata : buffer)
        processNextMidiEvent (metadata.getMessage());

    if (injectIndirectEvents)
    {
        const int firstEventToAdd = eventsToAdd.getFirstEventTime();
        const double scaleFactor = numSamples / (double) (eventsToAdd.getLastEventTime() + 1 - firstEventToAdd);

        for (const auto metadata : eventsToAdd)
        {
            const auto pos = jlimit (0, numSamples - 1, roundToInt ((metadata.samplePosition - firstEventToAdd) * scaleFactor));
            buffer.addEvent (metadata.getMessage(), startSample + pos);
        }
    }

    eventsToAdd.clear();
}

//==============================================================================
void MidiKeyboardState::addListener (Listener* listener)
{
    const ScopedLock sl (lock);
    listeners.add (listener);
}

void MidiKeyboardState::removeListener (Listener* listener)
{
    const ScopedLock sl (lock);
    listeners.remove (listener);
}

} // namespace juce