344 lines
10 KiB
C++
344 lines
10 KiB
C++
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2020 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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MPESynthesiser::MPESynthesiser()
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{
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MPEZoneLayout zoneLayout;
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zoneLayout.setLowerZone (15);
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setZoneLayout (zoneLayout);
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}
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MPESynthesiser::MPESynthesiser (MPEInstrument* mpeInstrument) : MPESynthesiserBase (mpeInstrument)
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{
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}
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MPESynthesiser::~MPESynthesiser()
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{
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}
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//==============================================================================
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void MPESynthesiser::startVoice (MPESynthesiserVoice* voice, MPENote noteToStart)
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{
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jassert (voice != nullptr);
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voice->currentlyPlayingNote = noteToStart;
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voice->noteOnTime = lastNoteOnCounter++;
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voice->noteStarted();
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}
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void MPESynthesiser::stopVoice (MPESynthesiserVoice* voice, MPENote noteToStop, bool allowTailOff)
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{
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jassert (voice != nullptr);
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voice->currentlyPlayingNote = noteToStop;
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voice->noteStopped (allowTailOff);
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}
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//==============================================================================
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void MPESynthesiser::noteAdded (MPENote newNote)
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{
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const ScopedLock sl (voicesLock);
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if (auto* voice = findFreeVoice (newNote, shouldStealVoices))
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startVoice (voice, newNote);
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}
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void MPESynthesiser::notePressureChanged (MPENote changedNote)
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{
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const ScopedLock sl (voicesLock);
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for (auto* voice : voices)
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{
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if (voice->isCurrentlyPlayingNote (changedNote))
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{
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voice->currentlyPlayingNote = changedNote;
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voice->notePressureChanged();
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}
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}
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}
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void MPESynthesiser::notePitchbendChanged (MPENote changedNote)
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{
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const ScopedLock sl (voicesLock);
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for (auto* voice : voices)
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{
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if (voice->isCurrentlyPlayingNote (changedNote))
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{
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voice->currentlyPlayingNote = changedNote;
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voice->notePitchbendChanged();
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}
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}
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}
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void MPESynthesiser::noteTimbreChanged (MPENote changedNote)
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{
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const ScopedLock sl (voicesLock);
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for (auto* voice : voices)
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{
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if (voice->isCurrentlyPlayingNote (changedNote))
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{
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voice->currentlyPlayingNote = changedNote;
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voice->noteTimbreChanged();
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}
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}
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}
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void MPESynthesiser::noteKeyStateChanged (MPENote changedNote)
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{
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const ScopedLock sl (voicesLock);
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for (auto* voice : voices)
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{
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if (voice->isCurrentlyPlayingNote (changedNote))
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{
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voice->currentlyPlayingNote = changedNote;
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voice->noteKeyStateChanged();
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}
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}
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}
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void MPESynthesiser::noteReleased (MPENote finishedNote)
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{
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const ScopedLock sl (voicesLock);
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for (auto i = voices.size(); --i >= 0;)
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{
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auto* voice = voices.getUnchecked (i);
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if (voice->isCurrentlyPlayingNote (finishedNote))
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stopVoice (voice, finishedNote, true);
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}
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}
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void MPESynthesiser::setCurrentPlaybackSampleRate (const double newRate)
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{
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MPESynthesiserBase::setCurrentPlaybackSampleRate (newRate);
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const ScopedLock sl (voicesLock);
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turnOffAllVoices (false);
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for (auto i = voices.size(); --i >= 0;)
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voices.getUnchecked (i)->setCurrentSampleRate (newRate);
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}
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void MPESynthesiser::handleMidiEvent (const MidiMessage& m)
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{
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if (m.isController())
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handleController (m.getChannel(), m.getControllerNumber(), m.getControllerValue());
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else if (m.isProgramChange())
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handleProgramChange (m.getChannel(), m.getProgramChangeNumber());
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MPESynthesiserBase::handleMidiEvent (m);
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}
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MPESynthesiserVoice* MPESynthesiser::findFreeVoice (MPENote noteToFindVoiceFor, bool stealIfNoneAvailable) const
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{
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const ScopedLock sl (voicesLock);
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for (auto* voice : voices)
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{
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if (! voice->isActive())
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return voice;
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}
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if (stealIfNoneAvailable)
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return findVoiceToSteal (noteToFindVoiceFor);
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return nullptr;
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}
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MPESynthesiserVoice* MPESynthesiser::findVoiceToSteal (MPENote noteToStealVoiceFor) const
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{
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// This voice-stealing algorithm applies the following heuristics:
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// - Re-use the oldest notes first
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// - Protect the lowest & topmost notes, even if sustained, but not if they've been released.
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// apparently you are trying to render audio without having any voices...
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jassert (voices.size() > 0);
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// These are the voices we want to protect (ie: only steal if unavoidable)
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MPESynthesiserVoice* low = nullptr; // Lowest sounding note, might be sustained, but NOT in release phase
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MPESynthesiserVoice* top = nullptr; // Highest sounding note, might be sustained, but NOT in release phase
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// this is a list of voices we can steal, sorted by how long they've been running
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Array<MPESynthesiserVoice*> usableVoices;
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usableVoices.ensureStorageAllocated (voices.size());
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for (auto* voice : voices)
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{
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jassert (voice->isActive()); // We wouldn't be here otherwise
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usableVoices.add (voice);
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// NB: Using a functor rather than a lambda here due to scare-stories about
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// compilers generating code containing heap allocations..
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struct Sorter
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{
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bool operator() (const MPESynthesiserVoice* a, const MPESynthesiserVoice* b) const noexcept { return a->noteOnTime < b->noteOnTime; }
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};
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std::sort (usableVoices.begin(), usableVoices.end(), Sorter());
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if (! voice->isPlayingButReleased()) // Don't protect released notes
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{
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auto noteNumber = voice->getCurrentlyPlayingNote().initialNote;
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if (low == nullptr || noteNumber < low->getCurrentlyPlayingNote().initialNote)
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low = voice;
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if (top == nullptr || noteNumber > top->getCurrentlyPlayingNote().initialNote)
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top = voice;
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}
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}
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// Eliminate pathological cases (ie: only 1 note playing): we always give precedence to the lowest note(s)
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if (top == low)
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top = nullptr;
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// If we want to re-use the voice to trigger a new note,
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// then The oldest note that's playing the same note number is ideal.
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if (noteToStealVoiceFor.isValid())
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for (auto* voice : usableVoices)
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if (voice->getCurrentlyPlayingNote().initialNote == noteToStealVoiceFor.initialNote)
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return voice;
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// Oldest voice that has been released (no finger on it and not held by sustain pedal)
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for (auto* voice : usableVoices)
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if (voice != low && voice != top && voice->isPlayingButReleased())
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return voice;
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// Oldest voice that doesn't have a finger on it:
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for (auto* voice : usableVoices)
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if (voice != low && voice != top
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&& voice->getCurrentlyPlayingNote().keyState != MPENote::keyDown
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&& voice->getCurrentlyPlayingNote().keyState != MPENote::keyDownAndSustained)
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return voice;
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// Oldest voice that isn't protected
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for (auto* voice : usableVoices)
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if (voice != low && voice != top)
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return voice;
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// We've only got "protected" voices now: lowest note takes priority
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jassert (low != nullptr);
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// Duophonic synth: give priority to the bass note:
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if (top != nullptr)
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return top;
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return low;
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}
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//==============================================================================
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void MPESynthesiser::addVoice (MPESynthesiserVoice* const newVoice)
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{
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const ScopedLock sl (voicesLock);
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newVoice->setCurrentSampleRate (getSampleRate());
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voices.add (newVoice);
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}
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void MPESynthesiser::clearVoices()
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{
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const ScopedLock sl (voicesLock);
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voices.clear();
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}
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MPESynthesiserVoice* MPESynthesiser::getVoice (const int index) const
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{
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const ScopedLock sl (voicesLock);
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return voices [index];
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}
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void MPESynthesiser::removeVoice (const int index)
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{
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const ScopedLock sl (voicesLock);
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voices.remove (index);
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}
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void MPESynthesiser::reduceNumVoices (const int newNumVoices)
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{
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// we can't possibly get to a negative number of voices...
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jassert (newNumVoices >= 0);
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const ScopedLock sl (voicesLock);
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while (voices.size() > newNumVoices)
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{
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if (auto* voice = findFreeVoice ({}, true))
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voices.removeObject (voice);
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else
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voices.remove (0); // if there's no voice to steal, kill the oldest voice
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}
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}
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void MPESynthesiser::turnOffAllVoices (bool allowTailOff)
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{
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{
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const ScopedLock sl (voicesLock);
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// first turn off all voices (it's more efficient to do this immediately
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// rather than to go through the MPEInstrument for this).
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for (auto* voice : voices)
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{
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voice->currentlyPlayingNote.noteOffVelocity = MPEValue::from7BitInt (64); // some reasonable number
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voice->currentlyPlayingNote.keyState = MPENote::off;
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voice->noteStopped (allowTailOff);
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}
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}
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// finally make sure the MPE Instrument also doesn't have any notes anymore.
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instrument->releaseAllNotes();
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}
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//==============================================================================
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void MPESynthesiser::renderNextSubBlock (AudioBuffer<float>& buffer, int startSample, int numSamples)
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{
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const ScopedLock sl (voicesLock);
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for (auto* voice : voices)
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{
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if (voice->isActive())
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voice->renderNextBlock (buffer, startSample, numSamples);
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}
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}
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void MPESynthesiser::renderNextSubBlock (AudioBuffer<double>& buffer, int startSample, int numSamples)
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{
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const ScopedLock sl (voicesLock);
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for (auto* voice : voices)
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{
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if (voice->isActive())
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voice->renderNextBlock (buffer, startSample, numSamples);
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}
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}
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} // namespace juce
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