OpenShot Audio Library | OpenShotAudio 0.3.2
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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
 
MidiBufferoperator= (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(), and juce::MidiKeyboardState::processNextMidiBuffer().

◆ 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
otherBufferthe buffer containing the events you want to add
startSamplethe 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
numSamplesthe 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.
sampleDeltaToAdda 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]

◆ 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(), clear(), ensureSize(), getFirstEventTime(), getLastEventTime(), juce::MidiBuffer::Iterator::getNextEvent(), juce::MidiBuffer::Iterator::getNextEvent(), getNumEvents(), isEmpty(), and juce::MidiBuffer::Iterator::setNextSamplePosition().


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