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juce::MidiMessageCollector Class Reference

`#include <juce_MidiMessageCollector.h>`

Inheritance diagram for juce::MidiMessageCollector:

## Public Member Functions

| MidiMessageCollector ()
| ~MidiMessageCollector () override
void | reset (double sampleRate)
void | addMessageToQueue (const MidiMessage &message)
void | removeNextBlockOfMessages (MidiBuffer &destBuffer, int numSamples)
void | ensureStorageAllocated (size_t bytes)
void | handleNoteOn (MidiKeyboardState *, int midiChannel, int midiNoteNumber, float velocity) override
void | handleNoteOff (MidiKeyboardState *, int midiChannel, int midiNoteNumber, float velocity) override
void | handleIncomingMidiMessage (MidiInput *, const MidiMessage &) override
Public Member Functions inherited from juce::MidiInputCallback
virtual | ~MidiInputCallback ()=default
virtual void | handlePartialSysexMessage (MidiInput *source, const uint8 *messageData, int numBytesSoFar, double timestamp)

## Detailed Description

Collects incoming realtime MIDI messages and turns them into blocks suitable for processing by a block-based audio callback.

The class can also be used as either a MidiKeyboardState::Listener or a MidiInputCallback so it can easily use a midi input or keyboard component as its source.

See also
  MidiMessage, MidiInput

Definition at line 38 of file juce_MidiMessageCollector.h.

## Constructor & Destructor Documentation

## MidiMessageCollector()

juce::MidiMessageCollector::MidiMessageCollector | ( |  | ) |

Creates a MidiMessageCollector.

Definition at line 26 of file juce_MidiMessageCollector.cpp.

## ~MidiMessageCollector()

juce::MidiMessageCollector::~MidiMessageCollector | ( |  | ) |

override

Destructor.

Definition at line 30 of file juce_MidiMessageCollector.cpp.

## Member Function Documentation

## addMessageToQueue()

void juce::MidiMessageCollector::addMessageToQueue | ( | const MidiMessage & | message | ) |

Takes an incoming real-time message and adds it to the queue.

The message's timestamp is taken, and it will be ready for retrieval as part of the block returned by the next call to removeNextBlockOfMessages().

This method is fully thread-safe when overlapping calls are made with removeNextBlockOfMessages().

Definition at line 49 of file juce_MidiMessageCollector.cpp.

Referenced by handleIncomingMidiMessage(), handleNoteOff(), and handleNoteOn().

## ensureStorageAllocated()

void juce::MidiMessageCollector::ensureStorageAllocated | ( | size_t | bytes | ) |

Preallocates storage for collected messages.

This can be called before audio processing begins to ensure that there is sufficient space for the expected MIDI messages, in order to avoid allocations within the audio callback.

Definition at line 131 of file juce_MidiMessageCollector.cpp.

## handleIncomingMidiMessage()

void juce::MidiMessageCollector::handleIncomingMidiMessage | ( | MidiInput * | ,
|  | const MidiMessage & | message )

override virtual

Implements juce::MidiInputCallback.

Definition at line 153 of file juce_MidiMessageCollector.cpp.

## handleNoteOff()

void juce::MidiMessageCollector::handleNoteOff | ( | MidiKeyboardState * | ,
|  | int | midiChannel,
|  | int | midiNoteNumber,
|  | float | velocity )

override virtual

Implements juce::MidiKeyboardState::Listener.

Definition at line 145 of file juce_MidiMessageCollector.cpp.

## handleNoteOn()

void juce::MidiMessageCollector::handleNoteOn | ( | MidiKeyboardState * | ,
|  | int | midiChannel,
|  | int | midiNoteNumber,
|  | float | velocity )

override virtual

Implements juce::MidiKeyboardState::Listener.

Definition at line 137 of file juce_MidiMessageCollector.cpp.

## removeNextBlockOfMessages()

void juce::MidiMessageCollector::removeNextBlockOfMessages | ( | MidiBuffer & | destBuffer,
|  | int | numSamples )

Removes all the pending messages from the queue as a buffer.

This will also correct the messages' timestamps to make sure they're in the range 0 to numSamples - 1.

This call should be made regularly by something like an audio processing callback, because the time that it happens is used in calculating the midi event positions.

This method is fully thread-safe when overlapping calls are made with addMessageToQueue().

Precondition: numSamples must be greater than 0.

Definition at line 71 of file juce_MidiMessageCollector.cpp.

## reset()

void juce::MidiMessageCollector::reset | ( | double | sampleRate | ) |

Clears any messages from the queue.

You need to call this method before starting to use the collector, so that it knows the correct sample rate to use.

Definition at line 35 of file juce_MidiMessageCollector.cpp.

The documentation for this class was generated from the following files:

- juce_MidiMessageCollector.h
- juce_MidiMessageCollector.cpp