OpenShot Audio Library | OpenShotAudio: juce_MPESynthesiser.cpp Source File

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juce_MPESynthesiser.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23namespace juce
24{
25
26MPESynthesiser::MPESynthesiser()
27{
28}
29
30 MPESynthesiser::MPESynthesiser (MPEInstrument& mpeInstrument)
31 : MPESynthesiserBase (mpeInstrument)
32{
33}
34
35MPESynthesiser::~MPESynthesiser()
36{
37}
38
39//==============================================================================
40 void MPESynthesiser::startVoice (MPESynthesiserVoice* voice, MPENote noteToStart)
41{
42 jassert (voice != nullptr);
43
44 voice->currentlyPlayingNote = noteToStart;
45 voice->noteOnTime = lastNoteOnCounter++;
46 voice->noteStarted();
47}
48
49 void MPESynthesiser::stopVoice (MPESynthesiserVoice* voice, MPENote noteToStop, bool allowTailOff)
50{
51 jassert (voice != nullptr);
52
53 voice->currentlyPlayingNote = noteToStop;
54 voice->noteStopped (allowTailOff);
55}
56
57//==============================================================================
58 void MPESynthesiser::noteAdded (MPENote newNote)
59{
60 const ScopedLock sl (voicesLock);
61
62 if (auto* voice = findFreeVoice (newNote, shouldStealVoices))
63 startVoice (voice, newNote);
64}
65
66 void MPESynthesiser::notePressureChanged (MPENote changedNote)
67{
68 const ScopedLock sl (voicesLock);
69
70 for (auto* voice : voices)
71 {
72 if (voice->isCurrentlyPlayingNote (changedNote))
73 {
74 voice->currentlyPlayingNote = changedNote;
75 voice->notePressureChanged();
76 }
77 }
78}
79
80 void MPESynthesiser::notePitchbendChanged (MPENote changedNote)
81{
82 const ScopedLock sl (voicesLock);
83
84 for (auto* voice : voices)
85 {
86 if (voice->isCurrentlyPlayingNote (changedNote))
87 {
88 voice->currentlyPlayingNote = changedNote;
89 voice->notePitchbendChanged();
90 }
91 }
92}
93
94 void MPESynthesiser::noteTimbreChanged (MPENote changedNote)
95{
96 const ScopedLock sl (voicesLock);
97
98 for (auto* voice : voices)
99 {
100 if (voice->isCurrentlyPlayingNote (changedNote))
101 {
102 voice->currentlyPlayingNote = changedNote;
103 voice->noteTimbreChanged();
104 }
105 }
106}
107
108 void MPESynthesiser::noteKeyStateChanged (MPENote changedNote)
109{
110 const ScopedLock sl (voicesLock);
111
112 for (auto* voice : voices)
113 {
114 if (voice->isCurrentlyPlayingNote (changedNote))
115 {
116 voice->currentlyPlayingNote = changedNote;
117 voice->noteKeyStateChanged();
118 }
119 }
120}
121
122 void MPESynthesiser::noteReleased (MPENote finishedNote)
123{
124 const ScopedLock sl (voicesLock);
125
126 for (auto i = voices.size(); --i >= 0;)
127 {
128 auto* voice = voices.getUnchecked (i);
129
130 if (voice->isCurrentlyPlayingNote (finishedNote))
131 stopVoice (voice, finishedNote, true);
132 }
133}
134
135 void MPESynthesiser::setCurrentPlaybackSampleRate (const double newRate)
136{
137 MPESynthesiserBase::setCurrentPlaybackSampleRate (newRate);
138
139 const ScopedLock sl (voicesLock);
140
141 turnOffAllVoices (false);
142
143 for (auto i = voices.size(); --i >= 0;)
144 voices.getUnchecked (i)->setCurrentSampleRate (newRate);
145}
146
147 void MPESynthesiser::handleMidiEvent (const MidiMessage& m)
148{
149 if (m.isController())
150 handleController (m.getChannel(), m.getControllerNumber(), m.getControllerValue());
151 else if (m.isProgramChange())
152 handleProgramChange (m.getChannel(), m.getProgramChangeNumber());
153
154 MPESynthesiserBase::handleMidiEvent (m);
155}
156
157 MPESynthesiserVoice* MPESynthesiser::findFreeVoice (MPENote noteToFindVoiceFor, bool stealIfNoneAvailable) const
158{
159 const ScopedLock sl (voicesLock);
160
161 for (auto* voice : voices)
162 {
163 if (! voice->isActive())
164 return voice;
165 }
166
167 if (stealIfNoneAvailable)
168 return findVoiceToSteal (noteToFindVoiceFor);
169
170 return nullptr;
171}
172
173 MPESynthesiserVoice* MPESynthesiser::findVoiceToSteal (MPENote noteToStealVoiceFor) const
174{
175 // This voice-stealing algorithm applies the following heuristics:
176 // - Re-use the oldest notes first
177 // - Protect the lowest & topmost notes, even if sustained, but not if they've been released.
178
179
180 // apparently you are trying to render audio without having any voices...
181 jassert (voices.size() > 0);
182
183 // These are the voices we want to protect (ie: only steal if unavoidable)
184 MPESynthesiserVoice* low = nullptr; // Lowest sounding note, might be sustained, but NOT in release phase
185 MPESynthesiserVoice* top = nullptr; // Highest sounding note, might be sustained, but NOT in release phase
186
187 // All major OSes use double-locking so this will be lock- and wait-free as long as stealLock is not
188 // contended. This is always the case if you do not call findVoiceToSteal on multiple threads at
189 // the same time.
190 const ScopedLock sl (stealLock);
191
192 // this is a list of voices we can steal, sorted by how long they've been running
193 usableVoicesToStealArray.clear();
194
195 for (auto* voice : voices)
196 {
197 jassert (voice->isActive()); // We wouldn't be here otherwise
198
199 usableVoicesToStealArray.add (voice);
200
201 // NB: Using a functor rather than a lambda here due to scare-stories about
202 // compilers generating code containing heap allocations..
203 struct Sorter
204 {
205 bool operator() (const MPESynthesiserVoice* a, const MPESynthesiserVoice* b) const noexcept { return a->noteOnTime < b->noteOnTime; }
206 };
207
208 std::sort (usableVoicesToStealArray.begin(), usableVoicesToStealArray.end(), Sorter());
209
210 if (! voice->isPlayingButReleased()) // Don't protect released notes
211 {
212 auto noteNumber = voice->getCurrentlyPlayingNote().initialNote;
213
214 if (low == nullptr || noteNumber < low->getCurrentlyPlayingNote().initialNote)
215 low = voice;
216
217 if (top == nullptr || noteNumber > top->getCurrentlyPlayingNote().initialNote)
218 top = voice;
219 }
220 }
221
222 // Eliminate pathological cases (ie: only 1 note playing): we always give precedence to the lowest note(s)
223 if (top == low)
224 top = nullptr;
225
226 // If we want to re-use the voice to trigger a new note,
227 // then The oldest note that's playing the same note number is ideal.
228 if (noteToStealVoiceFor.isValid())
229 for (auto* voice : usableVoicesToStealArray)
230 if (voice->getCurrentlyPlayingNote().initialNote == noteToStealVoiceFor.initialNote)
231 return voice;
232
233 // Oldest voice that has been released (no finger on it and not held by sustain pedal)
234 for (auto* voice : usableVoicesToStealArray)
235 if (voice != low && voice != top && voice->isPlayingButReleased())
236 return voice;
237
238 // Oldest voice that doesn't have a finger on it:
239 for (auto* voice : usableVoicesToStealArray)
240 if (voice != low && voice != top
241 && voice->getCurrentlyPlayingNote().keyState != MPENote::keyDown
242 && voice->getCurrentlyPlayingNote().keyState != MPENote::keyDownAndSustained)
243 return voice;
244
245 // Oldest voice that isn't protected
246 for (auto* voice : usableVoicesToStealArray)
247 if (voice != low && voice != top)
248 return voice;
249
250 // We've only got "protected" voices now: lowest note takes priority
251 jassert (low != nullptr);
252
253 // Duophonic synth: give priority to the bass note:
254 if (top != nullptr)
255 return top;
256
257 return low;
258}
259
260//==============================================================================
261 void MPESynthesiser::addVoice (MPESynthesiserVoice* const newVoice)
262{
263 {
264 const ScopedLock sl (voicesLock);
265 newVoice->setCurrentSampleRate (getSampleRate());
266 voices.add (newVoice);
267 }
268
269 {
270 const ScopedLock sl (stealLock);
271 usableVoicesToStealArray.ensureStorageAllocated (voices.size() + 1);
272 }
273}
274
275 void MPESynthesiser::clearVoices()
276{
277 const ScopedLock sl (voicesLock);
278 voices.clear();
279}
280
281 MPESynthesiserVoice* MPESynthesiser::getVoice (const int index) const
282{
283 const ScopedLock sl (voicesLock);
284 return voices [index];
285}
286
287 void MPESynthesiser::removeVoice (const int index)
288{
289 const ScopedLock sl (voicesLock);
290 voices.remove (index);
291}
292
293 void MPESynthesiser::reduceNumVoices (const int newNumVoices)
294{
295 // we can't possibly get to a negative number of voices...
296 jassert (newNumVoices >= 0);
297
298 const ScopedLock sl (voicesLock);
299
300 while (voices.size() > newNumVoices)
301 {
302 if (auto* voice = findFreeVoice ({}, true))
303 voices.removeObject (voice);
304 else
305 voices.remove (0); // if there's no voice to steal, kill the oldest voice
306 }
307}
308
309 void MPESynthesiser::turnOffAllVoices (bool allowTailOff)
310{
311 {
312 const ScopedLock sl (voicesLock);
313
314 // first turn off all voices (it's more efficient to do this immediately
315 // rather than to go through the MPEInstrument for this).
316 for (auto* voice : voices)
317 {
318 voice->currentlyPlayingNote.noteOffVelocity = MPEValue::from7BitInt (64); // some reasonable number
319 voice->currentlyPlayingNote.keyState = MPENote::off;
320
321 voice->noteStopped (allowTailOff);
322 }
323 }
324
325 // finally make sure the MPE Instrument also doesn't have any notes anymore.
326 instrument.releaseAllNotes();
327}
328
329//==============================================================================
330 void MPESynthesiser::renderNextSubBlock (AudioBuffer<float>& buffer, int startSample, int numSamples)
331{
332 const ScopedLock sl (voicesLock);
333
334 for (auto* voice : voices)
335 {
336 if (voice->isActive())
337 voice->renderNextBlock (buffer, startSample, numSamples);
338 }
339}
340
341 void MPESynthesiser::renderNextSubBlock (AudioBuffer<double>& buffer, int startSample, int numSamples)
342{
343 const ScopedLock sl (voicesLock);
344
345 for (auto* voice : voices)
346 {
347 if (voice->isActive())
348 voice->renderNextBlock (buffer, startSample, numSamples);
349 }
350}
351
352} // namespace juce
juce::AudioBuffer
Definition juce_AudioSampleBuffer.h:34
juce::MPEInstrument
Definition juce_MPEInstrument.h:54
juce::MPESynthesiserVoice
Definition juce_MPESynthesiserVoice.h:38
juce::MPESynthesiserVoice::setCurrentSampleRate
virtual void setCurrentSampleRate(double newRate)
Definition juce_MPESynthesiserVoice.h:152
juce::MPESynthesiserVoice::getCurrentlyPlayingNote
MPENote getCurrentlyPlayingNote() const noexcept
Definition juce_MPESynthesiserVoice.h:51
juce::MPESynthesiserVoice::noteStarted
virtual void noteStarted()=0
juce::MPESynthesiserVoice::noteOnTime
uint32 noteOnTime
Definition juce_MPESynthesiserVoice.h:162
juce::MPESynthesiserVoice::noteStopped
virtual void noteStopped(bool allowTailOff)=0
juce::MPESynthesiserVoice::isPlayingButReleased
bool isPlayingButReleased() const noexcept
Definition juce_MPESynthesiserVoice.cpp:40
juce::MPESynthesiser::removeVoice
void removeVoice(int index)
Definition juce_MPESynthesiser.cpp:287
juce::MPESynthesiser::reduceNumVoices
void reduceNumVoices(int newNumVoices)
Definition juce_MPESynthesiser.cpp:293
juce::MPESynthesiser::findFreeVoice
virtual MPESynthesiserVoice * findFreeVoice(MPENote noteToFindVoiceFor, bool stealIfNoneAvailable) const
Definition juce_MPESynthesiser.cpp:157
juce::MPESynthesiser::MPESynthesiser
MPESynthesiser()
Definition juce_MPESynthesiser.cpp:26
juce::MPESynthesiser::stopVoice
void stopVoice(MPESynthesiserVoice *voice, MPENote noteToStop, bool allowTailOff)
Definition juce_MPESynthesiser.cpp:49
juce::MPESynthesiser::setCurrentPlaybackSampleRate
void setCurrentPlaybackSampleRate(double newRate) override
Definition juce_MPESynthesiser.cpp:135
juce::MPESynthesiser::startVoice
void startVoice(MPESynthesiserVoice *voice, MPENote noteToStart)
Definition juce_MPESynthesiser.cpp:40
juce::MPESynthesiser::notePressureChanged
void notePressureChanged(MPENote changedNote) override
Definition juce_MPESynthesiser.cpp:66
juce::MPESynthesiser::noteReleased
void noteReleased(MPENote finishedNote) override
Definition juce_MPESynthesiser.cpp:122
juce::MPESynthesiser::clearVoices
void clearVoices()
Definition juce_MPESynthesiser.cpp:275
juce::MPESynthesiser::addVoice
void addVoice(MPESynthesiserVoice *newVoice)
Definition juce_MPESynthesiser.cpp:261
juce::MPESynthesiser::~MPESynthesiser
~MPESynthesiser() override
Definition juce_MPESynthesiser.cpp:35
juce::MPESynthesiser::findVoiceToSteal
virtual MPESynthesiserVoice * findVoiceToSteal(MPENote noteToStealVoiceFor=MPENote()) const
Definition juce_MPESynthesiser.cpp:173
juce::MPESynthesiser::noteTimbreChanged
void noteTimbreChanged(MPENote changedNote) override
Definition juce_MPESynthesiser.cpp:94
juce::MPESynthesiser::noteAdded
void noteAdded(MPENote newNote) override
Definition juce_MPESynthesiser.cpp:58
juce::MPESynthesiser::getVoice
MPESynthesiserVoice * getVoice(int index) const
Definition juce_MPESynthesiser.cpp:281
juce::MPESynthesiser::noteKeyStateChanged
void noteKeyStateChanged(MPENote changedNote) override
Definition juce_MPESynthesiser.cpp:108
juce::MPESynthesiser::turnOffAllVoices
virtual void turnOffAllVoices(bool allowTailOff)
Definition juce_MPESynthesiser.cpp:309
juce::MPESynthesiser::handleProgramChange
virtual void handleProgramChange(int, int)
Definition juce_MPESynthesiser.h:173
juce::MPESynthesiser::renderNextSubBlock
void renderNextSubBlock(AudioBuffer< float > &outputAudio, int startSample, int numSamples) override
Definition juce_MPESynthesiser.cpp:330
juce::MPESynthesiser::notePitchbendChanged
void notePitchbendChanged(MPENote changedNote) override
Definition juce_MPESynthesiser.cpp:80
juce::MPESynthesiser::handleMidiEvent
void handleMidiEvent(const MidiMessage &) override
Definition juce_MPESynthesiser.cpp:147
juce::MPESynthesiser::handleController
virtual void handleController(int, int, int)
Definition juce_MPESynthesiser.h:162
juce::MPEValue::from7BitInt
static MPEValue from7BitInt(int value) noexcept
Definition juce_MPEValue.cpp:30
juce::MidiMessage
Definition juce_MidiMessage.h:35
juce::MidiMessage::getChannel
int getChannel() const noexcept
Definition juce_MidiMessage.cpp:379
juce::MidiMessage::isProgramChange
bool isProgramChange() const noexcept
Definition juce_MidiMessage.cpp:524
juce::MidiMessage::isController
bool isController() const noexcept
Definition juce_MidiMessage.cpp:563
juce::MidiMessage::getControllerNumber
int getControllerNumber() const noexcept
Definition juce_MidiMessage.cpp:574
juce::MidiMessage::getProgramChangeNumber
int getProgramChangeNumber() const noexcept
Definition juce_MidiMessage.cpp:529
juce::MidiMessage::getControllerValue
int getControllerValue() const noexcept
Definition juce_MidiMessage.cpp:580
juce::MPENote
Definition juce_MPENote.h:40
juce::MPENote::keyDown
@ keyDown
Definition juce_MPENote.h:46
juce::MPENote::off
@ off
Definition juce_MPENote.h:45
juce::MPENote::keyDownAndSustained
@ keyDownAndSustained
Definition juce_MPENote.h:48
juce::MPENote::initialNote
uint8 initialNote
Definition juce_MPENote.h:108
juce::MPENote::keyState
KeyState keyState
Definition juce_MPENote.h:169
juce::MPENote::isValid
bool isValid() const noexcept
Definition juce_MPENote.cpp:62
juce::MPESynthesiserBase::handleMidiEvent
virtual void handleMidiEvent(const MidiMessage &)
Definition juce_MPESynthesiserBase.cpp:97
juce::MPESynthesiserBase::instrument
MPEInstrument & instrument
Definition juce_MPESynthesiserBase.h:202
juce::MPESynthesiserBase::setCurrentPlaybackSampleRate
virtual void setCurrentPlaybackSampleRate(double sampleRate)
Definition juce_MPESynthesiserBase.cpp:145
juce::MPESynthesiserBase::getSampleRate
double getSampleRate() const noexcept
Definition juce_MPESynthesiserBase.h:83
juce::MPESynthesiserBase::MPESynthesiserBase
MPESynthesiserBase()
Definition juce_MPESynthesiserBase.cpp:26