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RtMidiIn Class Reference

#include <RtMidi.h>

Inheritance diagram for RtMidiIn:

RtMidi List of all members.

Detailed Description

A realtime MIDI input class.

This class provides a common, platform-independent API for realtime MIDI input. It allows access to a single MIDI input port. Incoming MIDI messages are either saved to a queue for retrieval using the getMessage() function or immediately passed to a user-specified callback function. Create multiple instances of this class to connect to more than one MIDI device at the same time. With the OS-X and Linux ALSA MIDI APIs, it is also possible to open a virtual input port to which other MIDI software clients can connect.

by Gary P. Scavone, 2003-2004.


Public Types

typedef void(* RtMidiCallback )(double timeStamp, std::vector< unsigned char > *message, void *userData)
 User callback function type definition.

Public Member Functions

 RtMidiIn ()
 Default constructor.
 ~RtMidiIn ()
 If a MIDI connection is still open, it will be closed by the destructor.
void openPort (unsigned int portNumber=0)
 Open a MIDI input connection.
void openVirtualPort (const std::string portName=std::string("RtMidi Input"))
 Create a virtual input port, with optional name, to allow software connections (OS X and ALSA only).
void setCallback (RtMidiCallback callback, void *userData=0)
 Set a callback function to be invoked for incoming MIDI messages.
void cancelCallback ()
 Cancel use of the current callback function (if one exists).
void closePort (void)
 Close an open MIDI connection (if one exists).
unsigned int getPortCount ()
 Return the number of available MIDI input ports.
std::string getPortName (unsigned int portNumber=0)
 Return a string identifier for the specified MIDI input port number.
void setQueueSizeLimit (unsigned int queueSize)
 Set the maximum number of MIDI messages to be saved in the queue.
void ignoreTypes (bool midiSysex=true, bool midiTime=true, bool midiSense=true)
 Specify whether certain MIDI message types should be queued or ignored during input.
double getMessage (std::vector< unsigned char > *message)
 Fill the user-provided vector with the data bytes for the next available MIDI message in the input queue and return the event delta-time in seconds.


Constructor & Destructor Documentation

RtMidiIn::RtMidiIn  ) 
 

Default constructor.

An exception will be thrown if a MIDI system initialization error occurs.


Member Function Documentation

void RtMidiIn::openPort unsigned int  portNumber = 0  )  [virtual]
 

Open a MIDI input connection.

An optional port number greater than 0 can be specified. Otherwise, the default or first port found is opened.

Implements RtMidi.

void RtMidiIn::openVirtualPort const std::string  portName = std::string("RtMidi Input")  )  [virtual]
 

Create a virtual input port, with optional name, to allow software connections (OS X and ALSA only).

This function creates a virtual MIDI input port to which other software applications can connect. This type of functionality is currently only supported by the Macintosh OS-X and Linux ALSA APIs (the function does nothing for the other APIs).

Implements RtMidi.

void RtMidiIn::setCallback RtMidiCallback  callback,
void *  userData = 0
 

Set a callback function to be invoked for incoming MIDI messages.

The callback function will be called whenever an incoming MIDI message is received. While not absolutely necessary, it is best to set the callback function before opening a MIDI port to avoid leaving some messages in the queue.

void RtMidiIn::cancelCallback  ) 
 

Cancel use of the current callback function (if one exists).

Subsequent incoming MIDI messages will be written to the queue and can be retrieved with the getMessage function.

std::string RtMidiIn::getPortName unsigned int  portNumber = 0  )  [virtual]
 

Return a string identifier for the specified MIDI input port number.

An exception is thrown if an invalid port specifier is provided.

Implements RtMidi.

void RtMidiIn::setQueueSizeLimit unsigned int  queueSize  ) 
 

Set the maximum number of MIDI messages to be saved in the queue.

If the queue size limit is reached, incoming messages will be ignored. The default limit is 1024.

void RtMidiIn::ignoreTypes bool  midiSysex = true,
bool  midiTime = true,
bool  midiSense = true
 

Specify whether certain MIDI message types should be queued or ignored during input.

By default, MIDI timing and active sensing messages are ignored during message input because of their relative high data rates. MIDI sysex messages are ignored by default as well. Variable values of "true" imply that the respective message type will be ignored.

double RtMidiIn::getMessage std::vector< unsigned char > *  message  ) 
 

Fill the user-provided vector with the data bytes for the next available MIDI message in the input queue and return the event delta-time in seconds.

This function returns immediately whether a new message is available or not. A valid message is indicated by a non-zero vector size. An exception is thrown if an error occurs during message retrieval or an input connection was not previously established.


The documentation for this class was generated from the following file:
The Synthesis ToolKit in C++ (STK)
©1995-2007 Perry R. Cook and Gary P. Scavone. All Rights Reserved.