OpenShot Library | libopenshot-audio 0.2.0
juce_MidiKeyboardState.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2017 - ROLI Ltd.
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
26MidiKeyboardState::MidiKeyboardState()
27{
28 zerostruct (noteStates);
29}
30
31MidiKeyboardState::~MidiKeyboardState()
32{
33}
34
35//==============================================================================
37{
38 const ScopedLock sl (lock);
39 zerostruct (noteStates);
40 eventsToAdd.clear();
41}
42
43bool MidiKeyboardState::isNoteOn (const int midiChannel, const int n) const noexcept
44{
45 jassert (midiChannel >= 0 && midiChannel <= 16);
46
47 return isPositiveAndBelow (n, 128)
48 && (noteStates[n] & (1 << (midiChannel - 1))) != 0;
49}
50
51bool MidiKeyboardState::isNoteOnForChannels (const int midiChannelMask, const int n) const noexcept
52{
53 return isPositiveAndBelow (n, 128)
54 && (noteStates[n] & midiChannelMask) != 0;
55}
56
57void MidiKeyboardState::noteOn (const int midiChannel, const int midiNoteNumber, const float velocity)
58{
59 jassert (midiChannel >= 0 && midiChannel <= 16);
60 jassert (isPositiveAndBelow (midiNoteNumber, 128));
61
62 const ScopedLock sl (lock);
63
64 if (isPositiveAndBelow (midiNoteNumber, 128))
65 {
67 eventsToAdd.addEvent (MidiMessage::noteOn (midiChannel, midiNoteNumber, velocity), timeNow);
68 eventsToAdd.clear (0, timeNow - 500);
69
70 noteOnInternal (midiChannel, midiNoteNumber, velocity);
71 }
72}
73
74void MidiKeyboardState::noteOnInternal (const int midiChannel, const int midiNoteNumber, const float velocity)
75{
76 if (isPositiveAndBelow (midiNoteNumber, 128))
77 {
78 noteStates [midiNoteNumber] |= (1 << (midiChannel - 1));
79
80 for (int i = listeners.size(); --i >= 0;)
81 listeners.getUnchecked(i)->handleNoteOn (this, midiChannel, midiNoteNumber, velocity);
82 }
83}
84
85void MidiKeyboardState::noteOff (const int midiChannel, const int midiNoteNumber, const float velocity)
86{
87 const ScopedLock sl (lock);
88
89 if (isNoteOn (midiChannel, midiNoteNumber))
90 {
92 eventsToAdd.addEvent (MidiMessage::noteOff (midiChannel, midiNoteNumber), timeNow);
93 eventsToAdd.clear (0, timeNow - 500);
94
95 noteOffInternal (midiChannel, midiNoteNumber, velocity);
96 }
97}
98
99void MidiKeyboardState::noteOffInternal (const int midiChannel, const int midiNoteNumber, const float velocity)
100{
101 if (isNoteOn (midiChannel, midiNoteNumber))
102 {
103 noteStates [midiNoteNumber] &= ~(1 << (midiChannel - 1));
104
105 for (int i = listeners.size(); --i >= 0;)
106 listeners.getUnchecked(i)->handleNoteOff (this, midiChannel, midiNoteNumber, velocity);
107 }
108}
109
110void MidiKeyboardState::allNotesOff (const int midiChannel)
111{
112 const ScopedLock sl (lock);
113
114 if (midiChannel <= 0)
115 {
116 for (int i = 1; i <= 16; ++i)
117 allNotesOff (i);
118 }
119 else
120 {
121 for (int i = 0; i < 128; ++i)
122 noteOff (midiChannel, i, 0.0f);
123 }
124}
125
127{
128 if (message.isNoteOn())
129 {
130 noteOnInternal (message.getChannel(), message.getNoteNumber(), message.getFloatVelocity());
131 }
132 else if (message.isNoteOff())
133 {
134 noteOffInternal (message.getChannel(), message.getNoteNumber(), message.getFloatVelocity());
135 }
136 else if (message.isAllNotesOff())
137 {
138 for (int i = 0; i < 128; ++i)
139 noteOffInternal (message.getChannel(), i, 0.0f);
140 }
141}
142
144 const int startSample,
145 const int numSamples,
146 const bool injectIndirectEvents)
147{
148 MidiBuffer::Iterator i (buffer);
149 MidiMessage message;
150 int time;
151
152 const ScopedLock sl (lock);
153
154 while (i.getNextEvent (message, time))
155 processNextMidiEvent (message);
156
158 {
159 MidiBuffer::Iterator i2 (eventsToAdd);
160 const int firstEventToAdd = eventsToAdd.getFirstEventTime();
161 const double scaleFactor = numSamples / (double) (eventsToAdd.getLastEventTime() + 1 - firstEventToAdd);
162
163 while (i2.getNextEvent (message, time))
164 {
165 const int pos = jlimit (0, numSamples - 1, roundToInt ((time - firstEventToAdd) * scaleFactor));
166 buffer.addEvent (message, startSample + pos);
167 }
168 }
169
170 eventsToAdd.clear();
171}
172
173//==============================================================================
175{
176 const ScopedLock sl (lock);
177 listeners.addIfNotAlreadyThere (listener);
178}
179
181{
182 const ScopedLock sl (lock);
183 listeners.removeFirstMatchingValue (listener);
184}
185
186} // namespace juce
Holds a resizable array of primitive or copy-by-value objects.
Definition juce_Array.h:60
ElementType getUnchecked(int index) const
Returns one of the elements in the array, without checking the index passed in.
Definition juce_Array.h:256
int size() const noexcept
Returns the current number of elements in the array.
Definition juce_Array.h:219
void removeFirstMatchingValue(ParameterType valueToRemove)
Removes an item from the array.
Definition juce_Array.h:791
bool addIfNotAlreadyThere(ParameterType newElement)
Appends a new element at the end of the array as long as the array doesn't already contain it.
Definition juce_Array.h:479
Used to iterate through the events in a MidiBuffer.
bool getNextEvent(MidiMessage &result, int &samplePosition) noexcept
Retrieves a copy of the next event from the buffer.
Holds a sequence of time-stamped midi events.
int getFirstEventTime() const noexcept
Returns the sample number of the first event in the buffer.
void addEvent(const MidiMessage &midiMessage, int sampleNumber)
Adds an event to the buffer.
int getLastEventTime() const noexcept
Returns the sample number of the last event in the buffer.
void clear() noexcept
Removes all events from the buffer.
Receives events from a MidiKeyboardState object.
void processNextMidiBuffer(MidiBuffer &buffer, int startSample, int numSamples, bool injectIndirectEvents)
Scans a midi stream for up/down events and adds its own events to it.
void noteOff(int midiChannel, int midiNoteNumber, float velocity)
Turns a specified note off.
void allNotesOff(int midiChannel)
This will turn off any currently-down notes for the given midi channel.
void processNextMidiEvent(const MidiMessage &message)
Looks at a key-up/down event and uses it to update the state of this object.
void addListener(MidiKeyboardStateListener *listener)
Registers a listener for callbacks when keys go up or down.
bool isNoteOn(int midiChannel, int midiNoteNumber) const noexcept
Returns true if the given midi key is currently held down for the given midi channel.
void noteOn(int midiChannel, int midiNoteNumber, float velocity)
Turns a specified note on.
void reset()
Resets the state of the object.
bool isNoteOnForChannels(int midiChannelMask, int midiNoteNumber) const noexcept
Returns true if the given midi key is currently held down on any of a set of midi channels.
void removeListener(MidiKeyboardStateListener *listener)
Deregisters a listener.
Encapsulates a MIDI message.
bool isNoteOn(bool returnTrueForVelocity0=false) const noexcept
Returns true if this message is a 'key-down' event.
float getFloatVelocity() const noexcept
Returns the velocity of a note-on or note-off message.
int getChannel() const noexcept
Returns the midi channel associated with the message.
bool isNoteOff(bool returnTrueForNoteOnVelocity0=true) const noexcept
Returns true if this message is a 'key-up' event.
static MidiMessage noteOn(int channel, int noteNumber, float velocity) noexcept
Creates a key-down message (using a floating-point velocity).
int getNoteNumber() const noexcept
Returns the midi note number for note-on and note-off messages.
bool isAllNotesOff() const noexcept
Checks whether this message is an all-notes-off message.
static MidiMessage noteOff(int channel, int noteNumber, float velocity) noexcept
Creates a key-up message.
static uint32 getMillisecondCounter() noexcept
Returns the number of millisecs since a fixed event (usually system startup).