OpenShot Audio Library | OpenShotAudio: juce::MidiBuffer Class Reference

OpenShot Audio Library | OpenShotAudio 0.3.2

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Classes | Public Member Functions | Public Attributes | List of all members
juce::MidiBuffer Class Reference

`#include <juce_MidiBuffer.h>`

## Classes
class | Iterator

## Public Member Functions
| MidiBuffer () noexcept
| MidiBuffer (const MidiMessage &message) noexcept
| MidiBuffer (const MidiBuffer &) noexcept
MidiBuffer & | operator= (const MidiBuffer &) noexcept
| ~MidiBuffer ()
void | clear () noexcept
void | clear (int start, int numSamples)
bool | isEmpty () const noexcept
int | getNumEvents () const noexcept
void | addEvent (const MidiMessage &midiMessage, int sampleNumber)
void | addEvent (const void *rawMidiData, int maxBytesOfMidiData, int sampleNumber)
void | addEvents (const MidiBuffer &otherBuffer, int startSample, int numSamples, int sampleDeltaToAdd)
int | getFirstEventTime () const noexcept
int | getLastEventTime () const noexcept
void | swapWith (MidiBuffer &) noexcept
void | ensureSize (size_t minimumNumBytes)

## Public Attributes
Array< uint8 > | data

## Detailed Description

Holds a sequence of time-stamped midi events.

Analogous to the AudioBuffer, this holds a set of midi events with integer time-stamps. The buffer is kept sorted in order of the time-stamps.

If you're working with a sequence of midi events that may need to be manipulated or read/written to a midi file, then MidiMessageSequence is probably a more appropriate container. MidiBuffer is designed for lower-level streams of raw midi data.

See also
  MidiMessage

Definition at line 42 of file juce_MidiBuffer.h.

## Constructor & Destructor Documentation

## ◆ MidiBuffer() [1/3]

juce::MidiBuffer::MidiBuffer | ( |  | ) |
| noexcept

Creates an empty MidiBuffer.

Definition at line 84 of file juce_MidiBuffer.cpp.

## ◆ MidiBuffer() [2/3]

juce::MidiBuffer::MidiBuffer | ( | const MidiMessage & | message | ) |
| explicitnoexcept

Creates a MidiBuffer containing a single midi message.

Definition at line 95 of file juce_MidiBuffer.cpp.

## ◆ MidiBuffer() [3/3]

juce::MidiBuffer::MidiBuffer | ( | const MidiBuffer & | other | ) |
| noexcept

Creates a copy of another MidiBuffer.

Definition at line 87 of file juce_MidiBuffer.cpp.

## ◆ ~MidiBuffer()

juce::MidiBuffer::~MidiBuffer | ( |  | ) |

Destructor

Definition at line 85 of file juce_MidiBuffer.cpp.

## Member Function Documentation

## ◆ addEvent() [1/2]

void juce::MidiBuffer::addEvent | ( | const MidiMessage & | midiMessage,
|  | int | sampleNumber
| ) |  |

Adds an event to the buffer.

The sample number will be used to determine the position of the event in the buffer, which is always kept sorted. The MidiMessage's timestamp is ignored.

If an event is added whose sample position is the same as one or more events already in the buffer, the new event will be placed after the existing ones.

To retrieve events, use a MidiBuffer::Iterator object

Definition at line 113 of file juce_MidiBuffer.cpp.

Referenced by addEvent(), addEvents(), juce::MidiMessageCollector::addMessageToQueue(), juce::MidiRPNGenerator::generate(), juce::MidiKeyboardState::noteOff(), juce::MidiKeyboardState::noteOn(), juce::MidiKeyboardState::processNextMidiBuffer(), and juce::MidiMessageCollector::removeNextBlockOfMessages().

## ◆ addEvent() [2/2]

void juce::MidiBuffer::addEvent | ( | const void * | rawMidiData,
|  | int | maxBytesOfMidiData,
|  | int | sampleNumber
| ) |  |

Adds an event to the buffer from raw midi data.

The sample number will be used to determine the position of the event in the buffer, which is always kept sorted.

If an event is added whose sample position is the same as one or more events already in the buffer, the new event will be placed after the existing ones.

The event data will be inspected to calculate the number of bytes in length that the midi event really takes up, so maxBytesOfMidiData may be longer than the data that actually gets stored. E.g. if you pass in a note-on and a length of 4 bytes, it'll actually only store 3 bytes. If the midi data is invalid, it might not add an event at all.

To retrieve events, use a MidiBuffer::Iterator object

Definition at line 118 of file juce_MidiBuffer.cpp.

## ◆ addEvents()

void juce::MidiBuffer::addEvents | ( | const MidiBuffer & | otherBuffer,
|  | int | startSample,
|  | int | numSamples,
|  | int | sampleDeltaToAdd
| ) |  |

Adds some events from another buffer to this one.

Parameters

  otherBuffer | the buffer containing the events you want to add
  startSample | the lowest sample number in the source buffer for which events should be added. Any source events whose timestamp is less than this will be ignored
  numSamples | the valid range of samples from the source buffer for which events should be added - i.e. events in the source buffer whose timestamp is greater than or equal to (startSample + numSamples) will be ignored. If this value is less than 0, all events after startSample will be taken.
  sampleDeltaToAdd | a value which will be added to the source timestamps of the events that are added to this buffer

Definition at line 138 of file juce_MidiBuffer.cpp.

Referenced by juce::MPEMessages::clearAllZones(), and juce::MPEMessages::setZoneLayout().

## ◆ clear() [1/2]

void juce::MidiBuffer::clear | ( |  | ) |
| noexcept

Removes all events from the buffer.

Definition at line 101 of file juce_MidiBuffer.cpp.

Referenced by juce::MidiMessageCollector::addMessageToQueue(), juce::MidiKeyboardState::noteOff(), juce::MidiKeyboardState::noteOn(), juce::MidiKeyboardState::processNextMidiBuffer(), juce::MidiMessageCollector::removeNextBlockOfMessages(), juce::MidiKeyboardState::reset(), and juce::MidiMessageCollector::reset().

## ◆ clear() [2/2]

void juce::MidiBuffer::clear | ( | int | start,
|  | int | numSamples
| ) |  |

Removes all events between two times from the buffer.

All events for which (start <= event position < start + numSamples) will be removed.

Definition at line 105 of file juce_MidiBuffer.cpp.

## ◆ ensureSize()

void juce::MidiBuffer::ensureSize | ( | size_t | minimumNumBytes | ) |

Preallocates some memory for the buffer to use. This helps to avoid needing to reallocate space when the buffer has messages added to it.

Definition at line 102 of file juce_MidiBuffer.cpp.

## ◆ getFirstEventTime()

int juce::MidiBuffer::getFirstEventTime | ( |  | ) | const
| noexcept

Returns the sample number of the first event in the buffer. If the buffer's empty, this will just return 0.

Definition at line 165 of file juce_MidiBuffer.cpp.

Referenced by juce::MidiKeyboardState::processNextMidiBuffer().

## ◆ getLastEventTime()

int juce::MidiBuffer::getLastEventTime | ( |  | ) | const
| noexcept

Returns the sample number of the last event in the buffer. If the buffer's empty, this will just return 0.

Definition at line 170 of file juce_MidiBuffer.cpp.

Referenced by juce::MidiKeyboardState::processNextMidiBuffer().

## ◆ getNumEvents()

int juce::MidiBuffer::getNumEvents | ( |  | ) | const
| noexcept

Counts the number of events in the buffer.

This is actually quite a slow operation, as it has to iterate through all the events, so you might prefer to call isEmpty() if that's all you need to know.

Definition at line 154 of file juce_MidiBuffer.cpp.

## ◆ isEmpty()

bool juce::MidiBuffer::isEmpty | ( |  | ) | const
| noexcept

Returns true if the buffer is empty. To actually retrieve the events, use a MidiBuffer::Iterator object

Definition at line 103 of file juce_MidiBuffer.cpp.

Referenced by juce::MidiMessageCollector::removeNextBlockOfMessages().

## ◆ operator=()

MidiBuffer & juce::MidiBuffer::operator= | ( | const MidiBuffer & | other | ) |
| noexcept

Makes a copy of another MidiBuffer.

Definition at line 89 of file juce_MidiBuffer.cpp.

## ◆ swapWith()

void juce::MidiBuffer::swapWith | ( | MidiBuffer & | other | ) |
| noexcept

Exchanges the contents of this buffer with another one.

This is a quick operation, because no memory allocating or copying is done, it just swaps the internal state of the two buffers.

Definition at line 100 of file juce_MidiBuffer.cpp.

## Member Data Documentation

## ◆ data

Array<uint8> juce::MidiBuffer::data

The raw data holding this buffer. Obviously access to this data is provided at your own risk. Its internal format could change in future, so don't write code that relies on it!

Definition at line 228 of file juce_MidiBuffer.h.

Referenced by addEvent(), clear(), ensureSize(), getFirstEventTime(), getLastEventTime(), juce::MidiBuffer::Iterator::getNextEvent(), getNumEvents(), isEmpty(), operator=(), and juce::MidiBuffer::Iterator::setNextSamplePosition().

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

- juce_MidiBuffer.h
- juce_MidiBuffer.cpp