javax.sound.midi
Class ShortMessage

java.lang.Object
  |
  +--javax.sound.midi.MidiMessage
        |
        +--javax.sound.midi.ShortMessage

All Implemented Interfaces:

Cloneable

public class ShortMessage

extends MidiMessage

A ShortMessage contains a MIDI message that has at most two data bytes following its status byte. The types of MIDI message that satisfy this criterion are channel voice, channel mode, system common, and system real-time--in other words, everything except system exclusive and meta-events. The ShortMessage class provides methods for getting and setting the contents of the MIDI message.

A number of ShortMessage methods have integer parameters by which you specify a MIDI status or data byte. If you know the numeric value, you can express it directly. For system common and system real-time messages, you can often use the corresponding fields of ShortMessage, such as SYSTEM_RESET. For channel messages, the upper four bits of the status byte are specified by a command value and the lower four bits are specified by a MIDI channel number. To convert incoming MIDI data bytes that are in the form of Java's signed bytes, you can use the conversion code given in the MidiMessage class description.

See Also:

SysexMessage, MetaMessage

Field Summary

static int	ACTIVE_SENSING Status byte for Active Sensing message (0xFE, or 254).
static int	CHANNEL_PRESSURE Command value for Channel Pressure (Aftertouch) message (0xD0, or 208)
static int	CONTINUE Status byte for Continue message (0xFB, or 251).
static int	CONTROL_CHANGE Command value for Control Change message (0xB0, or 176)
static int	END_OF_EXCLUSIVE Status byte for End of System Exclusive message (0xF7, or 247).
static int	MIDI_TIME_CODE Status byte for MIDI Time Code Quarter Frame message (0xF1, or 241).
static int	NOTE_OFF Command value for Note Off message (0x80, or 128)
static int	NOTE_ON Command value for Note On message (0x90, or 144)
static int	PITCH_BEND Command value for Pitch Bend message (0xE0, or 224)
static int	POLY_PRESSURE Command value for Polyphonic Key Pressure (Aftertouch) message (0xA0, or 128)
static int	PROGRAM_CHANGE Command value for Program Change message (0xC0, or 192)
static int	SONG_POSITION_POINTER Status byte for Song Position Pointer message (0xF2, or 242).
static int	SONG_SELECT Status byte for MIDI Song Select message (0xF3, or 243).
static int	START Status byte for Start message (0xFA, or 250).
static int	STOP Status byte for Stop message (0xFC, or 252).
static int	SYSTEM_RESET Status byte for System Reset message (0xFF, or 255).
static int	TIMING_CLOCK Status byte for Timing Clock messagem (0xF8, or 248).
static int	TUNE_REQUEST Status byte for Tune Request message (0xF6, or 246).

Fields inherited from class javax.sound.midi.MidiMessage

data, length

Constructor Summary

	ShortMessage() Constructs a new ShortMessage.
protected	ShortMessage(byte[] data) Constructs a new ShortMessage.

Method Summary

Object	clone() Creates a new object of the same class and with the same contents as this object.
int	getChannel() Obtains the MIDI channel associated with this event.
int	getCommand() Obtains the MIDI command associated with this event.
int	getData1() Obtains the first data byte in the message.
int	getData2() Obtains the second data byte in the message.
protected int	getDataLength(int status) Retrieves the number of data bytes associated with a particular status byte value.
void	setMessage(int status) Sets the parameters for a MIDI message that takes no data bytes.
void	setMessage(int status, int data1, int data2) Sets the parameters for a MIDI message that takes one or two data bytes.
void	setMessage(int command, int channel, int data1, int data2) Sets the short message parameters for a channel message which takes one or two data bytes.

Methods inherited from class javax.sound.midi.MidiMessage

getLength, getMessage, getStatus, setMessage

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MIDI_TIME_CODE

public static final int MIDI_TIME_CODE

Status byte for MIDI Time Code Quarter Frame message (0xF1, or 241).

See Also:

MidiMessage.getStatus()

SONG_POSITION_POINTER

public static final int SONG_POSITION_POINTER

Status byte for Song Position Pointer message (0xF2, or 242).

See Also:

MidiMessage.getStatus()

SONG_SELECT

public static final int SONG_SELECT

Status byte for MIDI Song Select message (0xF3, or 243).

See Also:

MidiMessage.getStatus()

TUNE_REQUEST

public static final int TUNE_REQUEST

Status byte for Tune Request message (0xF6, or 246).

See Also:

MidiMessage.getStatus()

END_OF_EXCLUSIVE

public static final int END_OF_EXCLUSIVE

Status byte for End of System Exclusive message (0xF7, or 247).

See Also:

MidiMessage.getStatus()

TIMING_CLOCK

public static final int TIMING_CLOCK

Status byte for Timing Clock messagem (0xF8, or 248).

See Also:

MidiMessage.getStatus()

START

public static final int START

Status byte for Start message (0xFA, or 250).

See Also:

MidiMessage.getStatus()

CONTINUE

public static final int CONTINUE

Status byte for Continue message (0xFB, or 251).

See Also:

MidiMessage.getStatus()

STOP

public static final int STOP

Status byte for Stop message (0xFC, or 252).

See Also:

MidiMessage.getStatus()

ACTIVE_SENSING

public static final int ACTIVE_SENSING

Status byte for Active Sensing message (0xFE, or 254).

See Also:

MidiMessage.getStatus()

SYSTEM_RESET

public static final int SYSTEM_RESET

Status byte for System Reset message (0xFF, or 255).

See Also:

MidiMessage.getStatus()

NOTE_OFF

public static final int NOTE_OFF

Command value for Note Off message (0x80, or 128)

NOTE_ON

public static final int NOTE_ON

Command value for Note On message (0x90, or 144)

POLY_PRESSURE

public static final int POLY_PRESSURE

Command value for Polyphonic Key Pressure (Aftertouch) message (0xA0, or 128)

CONTROL_CHANGE

public static final int CONTROL_CHANGE

Command value for Control Change message (0xB0, or 176)

PROGRAM_CHANGE

public static final int PROGRAM_CHANGE

Command value for Program Change message (0xC0, or 192)

CHANNEL_PRESSURE

public static final int CHANNEL_PRESSURE

Command value for Channel Pressure (Aftertouch) message (0xD0, or 208)

PITCH_BEND

public static final int PITCH_BEND

Command value for Pitch Bend message (0xE0, or 224)

Constructor Detail

ShortMessage

public ShortMessage()

Constructs a new ShortMessage. The contents of the new message are guaranteed to specify a valid MIDI message. Subsequently, you may set the contents of the message using one of the setMessage methods.

See Also:

setMessage(int)

ShortMessage

protected ShortMessage(byte[] data)

Constructs a new ShortMessage.

Parameters:

data - an array of bytes containing the complete message. The message data may be changed using the setMessage method.

See Also:

setMessage(int)

Method Detail

setMessage

public void setMessage(int status)
                throws InvalidMidiDataException

Sets the parameters for a MIDI message that takes no data bytes.

Parameters:

status - the MIDI status byte

Throws:

InvalidMidiDataException - if status does not specify a valid MIDI status byte for a message that requires no data bytes.

See Also:

setMessage(int, int, int), setMessage(int, int, int, int)

setMessage

public void setMessage(int status,
                       int data1,
                       int data2)
                throws InvalidMidiDataException

Sets the parameters for a MIDI message that takes one or two data bytes. If the message takes only one data byte, the value passed in for the second data byte should be 0.

Parameters:

status - the MIDI status byte

data1 - the first data byte

data2 - the second data byte

Throws:

InvalidMidiDataException - if the the status or data bytes do not specify a valid MIDI message

See Also:

setMessage(int, int, int, int), setMessage(int)

setMessage

public void setMessage(int command,
                       int channel,
                       int data1,
                       int data2)
                throws InvalidMidiDataException

Sets the short message parameters for a channel message which takes one or two data bytes. If the message only takes one data byte, the second data byte value passed should be 0.

Parameters:

command - the MIDI command represented by this message

channel - the channel associated with the message

data1 - the first data byte

data2 - the second data byte

Throws:

InvalidMidiDataException - if the parameter values do not specify a valid MIDI message

See Also:

setMessage(int, int, int), setMessage(int), getCommand(), getChannel(), getData1(), getData2()

getChannel

public int getChannel()

Obtains the MIDI channel associated with this event. This method assumes that the event is a MIDI channel message; if not, the return value will not be meaningful.

Returns:

MIDI channel associated with the message.

See Also:

setMessage(int, int, int, int)

getCommand

public int getCommand()

Obtains the MIDI command associated with this event. This method assumes that the event is a MIDI channel message; if not, the return value will not be meaningful.

See Also:

setMessage(int, int, int, int)

getData1

public int getData1()

Obtains the first data byte in the message.

Returns:

the value of the data1 field

See Also:

setMessage(int, int, int)

getData2

public int getData2()

Obtains the second data byte in the message.

Returns:

the value of the data2 field

See Also:

setMessage(int, int, int)

clone

public Object clone()

Creates a new object of the same class and with the same contents as this object.

Overrides:

clone in class MidiMessage

Returns:

a clone of this instance.

getDataLength

protected final int getDataLength(int status)
                           throws InvalidMidiDataException

Retrieves the number of data bytes associated with a particular status byte value.

Parameters:

status - status byte value, which must represent a short MIDI message

Returns:

data length in bytes (0, 1, or 2)

Throws:

InvalidMidiDataException - if the status argument does not represent the status byte for any short message