OpenShot Audio Library | OpenShotAudio: juce::MPESynthesiserBase Struct Reference

OpenShot Audio Library | OpenShotAudio 0.4.0

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Public Types | Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
juce::MPESynthesiserBase Struct Referenceabstract

`#include <juce_MPESynthesiserBase.h>`

Inheritance diagram for juce::MPESynthesiserBase:

## Public Types
using | TrackingMode = MPEInstrument::TrackingMode

## Public Member Functions
| MPESynthesiserBase ()
| MPESynthesiserBase (MPEInstrument &instrument)
MPEZoneLayout | getZoneLayout () const noexcept
void | setZoneLayout (MPEZoneLayout newLayout)
virtual void | setCurrentPlaybackSampleRate (double sampleRate)
double | getSampleRate () const noexcept
template<typename floatType >
void | renderNextBlock (AudioBuffer< floatType > &outputAudio, const MidiBuffer &inputMidi, int startSample, int numSamples)
virtual void | handleMidiEvent (const MidiMessage &)
void | setMinimumRenderingSubdivisionSize (int numSamples, bool shouldBeStrict=false) noexcept
void | enableLegacyMode (int pitchbendRange=2, Range< int > channelRange=Range< int >(1, 17))
bool | isLegacyModeEnabled () const noexcept
Range< int > | getLegacyModeChannelRange () const noexcept
void | setLegacyModeChannelRange (Range< int > channelRange)
int | getLegacyModePitchbendRange () const noexcept
void | setLegacyModePitchbendRange (int pitchbendRange)
void | setPressureTrackingMode (TrackingMode modeToUse)
void | setPitchbendTrackingMode (TrackingMode modeToUse)
void | setTimbreTrackingMode (TrackingMode modeToUse)
Public Member Functions inherited from juce::MPEInstrument::Listener
virtual | ~Listener ()=default
virtual void | noteAdded (MPENote newNote)
virtual void | notePressureChanged (MPENote changedNote)
virtual void | notePitchbendChanged (MPENote changedNote)
virtual void | noteTimbreChanged (MPENote changedNote)
virtual void | noteKeyStateChanged (MPENote changedNote)
virtual void | noteReleased (MPENote finishedNote)
virtual void | zoneLayoutChanged ()

## Protected Member Functions
virtual void | renderNextSubBlock (AudioBuffer< float > &outputAudio, int startSample, int numSamples)=0
virtual void | renderNextSubBlock (AudioBuffer< double > &, int, int)

## Protected Attributes
MPEInstrument & | instrument

## Detailed Description

Derive from this class to create a basic audio generator capable of MPE. Implement the callbacks of MPEInstrument::Listener (noteAdded, notePressureChanged etc.) to let your audio generator know that MPE notes were triggered, modulated, or released. What to do inside them, and how that influences your audio generator, is up to you!

This class uses an instance of MPEInstrument internally to handle the MPE note state logic.

This class is a very low-level base class for an MPE instrument. If you need something more sophisticated, have a look at MPESynthesiser. This class extends MPESynthesiserBase by adding the concept of voices that can play notes, a voice stealing algorithm, and much more.

See also
  MPESynthesiser, MPEInstrument

Definition at line 46 of file juce_MPESynthesiserBase.h.

## Member Typedef Documentation

## ◆ TrackingMode

using juce::MPESynthesiserBase::TrackingMode = MPEInstrument::TrackingMode

Definition at line 172 of file juce_MPESynthesiserBase.h.

## Constructor & Destructor Documentation

## ◆ MPESynthesiserBase() [1/2]

juce::MPESynthesiserBase::MPESynthesiserBase | ( |  | ) |

Constructor.

Definition at line 26 of file juce_MPESynthesiserBase.cpp.

## ◆ MPESynthesiserBase() [2/2]

juce::MPESynthesiserBase::MPESynthesiserBase | ( | MPEInstrument & | instrument | ) |

Constructor.

If you use this constructor, the synthesiser will use the provided instrument object to handle the MPE note state logic. This is useful if you want to use an instance of your own class derived from MPEInstrument for the MPE logic.

Definition at line 32 of file juce_MPESynthesiserBase.cpp.

## Member Function Documentation

## ◆ enableLegacyMode()

void juce::MPESynthesiserBase::enableLegacyMode | ( | int | pitchbendRange = 2,
|  | Range< int > | channelRange = Range<int> (1, 17) )

Puts the synthesiser into legacy mode.

Parameters

  pitchbendRange | The note pitchbend range in semitones to use when in legacy mode. Must be between 0 and 96, otherwise behaviour is undefined. The default pitchbend range in legacy mode is +/- 2 semitones.
  channelRange | The range of MIDI channels to use for notes when in legacy mode. The default is to use all MIDI channels (1-16).

To get out of legacy mode, set a new MPE zone layout using setZoneLayout.

Definition at line 50 of file juce_MPESynthesiserBase.cpp.

## ◆ getLegacyModeChannelRange()

Range< int > juce::MPESynthesiserBase::getLegacyModeChannelRange | ( |  | ) | const
| noexcept

Returns the range of MIDI channels (1-16) to be used for notes when in legacy mode.

Definition at line 60 of file juce_MPESynthesiserBase.cpp.

## ◆ getLegacyModePitchbendRange()

int juce::MPESynthesiserBase::getLegacyModePitchbendRange | ( |  | ) | const
| noexcept

Returns the pitchbend range in semitones (0-96) to be used for notes when in legacy mode.

Definition at line 70 of file juce_MPESynthesiserBase.cpp.

## ◆ getSampleRate()

double juce::MPESynthesiserBase::getSampleRate | ( |  | ) | const
| inlinenoexcept

Returns the current target sample rate at which rendering is being done. Subclasses may need to know this so that they can pitch things correctly.

Definition at line 83 of file juce_MPESynthesiserBase.h.

Referenced by juce::MPESynthesiser::addVoice().

## ◆ getZoneLayout()

MPEZoneLayout juce::MPESynthesiserBase::getZoneLayout | ( |  | ) | const
| noexcept

Returns the synthesiser's internal MPE zone layout. This happens by value, to enforce thread-safety and class invariants.

Definition at line 39 of file juce_MPESynthesiserBase.cpp.

## ◆ handleMidiEvent()

void juce::MPESynthesiserBase::handleMidiEvent | ( | const MidiMessage & | m | ) |
| virtual

Handle incoming MIDI events (called from renderNextBlock).

The default implementation provided here simply forwards everything to MPEInstrument::processNextMidiEvent, where it is used to update the MPE notes, zones etc. MIDI messages not relevant for MPE are ignored.

This method can be overridden if you need to do custom MIDI handling on top of MPE. The MPESynthesiser class overrides this to implement callbacks for MIDI program changes and non-MPE-related MIDI controller messages.

Reimplemented in juce::MPESynthesiser.

Definition at line 97 of file juce_MPESynthesiserBase.cpp.

Referenced by juce::MPESynthesiser::handleMidiEvent(), and renderNextBlock().

## ◆ isLegacyModeEnabled()

bool juce::MPESynthesiserBase::isLegacyModeEnabled | ( |  | ) | const
| noexcept

Returns true if the instrument is in legacy mode, false otherwise.

Definition at line 55 of file juce_MPESynthesiserBase.cpp.

## ◆ renderNextBlock()

template<typename floatType >

template void juce::MPESynthesiserBase::renderNextBlock< double > | ( | AudioBuffer< floatType > & | outputAudio,
|  | const MidiBuffer & | inputMidi,
|  | int | startSample,
|  | int | numSamples )

Creates the next block of audio output.

Call this to make sound. This will chop up the AudioBuffer into subBlock pieces separated by events in the MIDI buffer, and then call renderNextSubBlock on each one of them. In between you will get calls to noteAdded/Changed/Finished, where you can update parameters that depend on those notes to use for your audio rendering.

Parameters

  outputAudio | Buffer into which audio will be rendered
  inputMidi | MIDI events to process
  startSample | The first sample to process in both buffers
  numSamples | The number of samples to process

Definition at line 104 of file juce_MPESynthesiserBase.cpp.

## ◆ renderNextSubBlock() [1/2]

virtual void juce::MPESynthesiserBase::renderNextSubBlock | ( | AudioBuffer< double > & | ,
|  | int | ,
|  | int | )
| inlineprotectedvirtual

Implement this method if you want to render 64-bit audio as well; otherwise leave blank.

Reimplemented in juce::MPESynthesiser.

Definition at line 195 of file juce_MPESynthesiserBase.h.

## ◆ renderNextSubBlock() [2/2]

virtual void juce::MPESynthesiserBase::renderNextSubBlock | ( | AudioBuffer< float > & | outputAudio,
|  | int | startSample,
|  | int | numSamples )
| protectedpure virtual

Implement this method to render your audio inside.

See also
  renderNextBlock

Implemented in juce::MPESynthesiser.

Referenced by renderNextBlock().

## ◆ setCurrentPlaybackSampleRate()

void juce::MPESynthesiserBase::setCurrentPlaybackSampleRate | ( | double | sampleRate | ) |
| virtual

Tells the synthesiser what the sample rate is for the audio it's being used to render.

Reimplemented in juce::MPESynthesiser.

Definition at line 145 of file juce_MPESynthesiserBase.cpp.

Referenced by juce::MPESynthesiser::setCurrentPlaybackSampleRate().

## ◆ setLegacyModeChannelRange()

void juce::MPESynthesiserBase::setLegacyModeChannelRange | ( | Range< int > | channelRange | ) |

Re-sets the range of MIDI channels (1-16) to be used for notes when in legacy mode.

Definition at line 65 of file juce_MPESynthesiserBase.cpp.

## ◆ setLegacyModePitchbendRange()

void juce::MPESynthesiserBase::setLegacyModePitchbendRange | ( | int | pitchbendRange | ) |

Re-sets the pitchbend range in semitones (0-96) to be used for notes when in legacy mode.

Definition at line 75 of file juce_MPESynthesiserBase.cpp.

## ◆ setMinimumRenderingSubdivisionSize()

void juce::MPESynthesiserBase::setMinimumRenderingSubdivisionSize | ( | int | numSamples,
|  | bool | shouldBeStrict = false )
| noexcept

Sets a minimum limit on the size to which audio sub-blocks will be divided when rendering.

When rendering, the audio blocks that are passed into renderNextBlock() will be split up into smaller blocks that lie between all the incoming midi messages, and it is these smaller sub-blocks that are rendered with multiple calls to renderVoices().

Obviously in a pathological case where there are midi messages on every sample, then renderVoices() could be called once per sample and lead to poor performance, so this setting allows you to set a lower limit on the block size.

The default setting is 32, which means that midi messages are accurate to about < 1ms accuracy, which is probably fine for most purposes, but you may want to increase or decrease this value for your synth.

If shouldBeStrict is true, the audio sub-blocks will strictly never be smaller than numSamples.

If shouldBeStrict is false (default), the first audio sub-block in the buffer is allowed to be smaller, to make sure that the first MIDI event in a buffer will always be sample-accurate (this can sometimes help to avoid quantisation or phasing issues).

Definition at line 156 of file juce_MPESynthesiserBase.cpp.

## ◆ setPitchbendTrackingMode()

void juce::MPESynthesiserBase::setPitchbendTrackingMode | ( | TrackingMode | modeToUse | ) |

Set the MPE tracking mode for the pitchbend dimension.

Definition at line 86 of file juce_MPESynthesiserBase.cpp.

## ◆ setPressureTrackingMode()

void juce::MPESynthesiserBase::setPressureTrackingMode | ( | TrackingMode | modeToUse | ) |

Set the MPE tracking mode for the pressure dimension.

Definition at line 81 of file juce_MPESynthesiserBase.cpp.

## ◆ setTimbreTrackingMode()

void juce::MPESynthesiserBase::setTimbreTrackingMode | ( | TrackingMode | modeToUse | ) |

Set the MPE tracking mode for the timbre dimension.

Definition at line 91 of file juce_MPESynthesiserBase.cpp.

## ◆ setZoneLayout()

void juce::MPESynthesiserBase::setZoneLayout | ( | MPEZoneLayout | newLayout | ) |

Re-sets the synthesiser's internal MPE zone layout to the one passed in. As a side effect, this will discard all currently playing notes, call noteReleased for all of them, and disable legacy mode (if previously enabled).

Definition at line 44 of file juce_MPESynthesiserBase.cpp.

## Member Data Documentation

## ◆ instrument

MPEInstrument& juce::MPESynthesiserBase::instrument
| protected

Definition at line 202 of file juce_MPESynthesiserBase.h.

Referenced by enableLegacyMode(), getLegacyModeChannelRange(), getLegacyModePitchbendRange(), getZoneLayout(), handleMidiEvent(), isLegacyModeEnabled(), MPESynthesiserBase(), MPESynthesiserBase(), setCurrentPlaybackSampleRate(), setLegacyModeChannelRange(), setLegacyModePitchbendRange(), setPitchbendTrackingMode(), setPressureTrackingMode(), setTimbreTrackingMode(), setZoneLayout(), and juce::MPESynthesiser::turnOffAllVoices().

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

- juce_MPESynthesiserBase.h
- juce_MPESynthesiserBase.cpp