Module java.desktop

Package javax.sound.midi

Class MidiFileFormat

java.lang.Object

javax.sound.midi.MidiFileFormat

public class MidiFileFormat
extends Object

A MidiFileFormat object encapsulates a MIDI file's type, as well as its length and timing information.

A MidiFileFormat object can include a set of properties. A property is a pair of key and value: the key is of type String, the associated property value is an arbitrary object. Properties specify additional informational meta data (like a author, or copyright). Properties are optional information, and file reader and file writer implementations are not required to provide or recognize properties.

The following table lists some common properties that should be used in implementations:

MIDI File Format Properties

Property key	Value type	Description
"author"	String	name of the author of this file
"title"	String	title of this file
"copyright"	String	copyright message
"date"	Date	date of the recording or release
"comment"	String	an arbitrary text

See Also:

• MidiSystem.getMidiFileFormat(java.io.File)
• Sequencer.setSequence(java.io.InputStream stream)

Field Summary

Fields

Modifier and Type	Field	Description
protected int	byteLength	The length of the MIDI file in bytes.
protected float	divisionType	The division type of the MIDI file.
protected long	microsecondLength	The duration of the MIDI file in microseconds.
protected int	resolution	The timing resolution of the MIDI file.
protected int	type	The type of MIDI file.
static final int	UNKNOWN_LENGTH	Represents unknown length.

Constructor Summary

Constructors

Constructor	Description
MidiFileFormat(int type, float divisionType, int resolution, int bytes, long microseconds)	Constructs a MidiFileFormat.
MidiFileFormat(int type, float divisionType, int resolution, int bytes, long microseconds, Map<String,Object> properties)	Construct a MidiFileFormat with a set of properties.

Method Summary

Modifier and Type	Method	Description
int	getByteLength()	Obtains the length of the MIDI file, expressed in 8-bit bytes.
float	getDivisionType()	Obtains the timing division type for the MIDI file.
long	getMicrosecondLength()	Obtains the length of the MIDI file, expressed in microseconds.
Object	getProperty(String key)	Obtain the property value specified by the key.
int	getResolution()	Obtains the timing resolution for the MIDI file.
int	getType()	Obtains the MIDI file type.
Map<String,Object>	properties()	Obtain an unmodifiable map of properties.

Methods declared in class java.lang.Object

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

Field Details

UNKNOWN_LENGTH

public static final int UNKNOWN_LENGTH

Represents unknown length.

See Also:

• getByteLength()
• getMicrosecondLength()
• Constant Field Values

type

protected int type

The type of MIDI file.

divisionType

protected float divisionType

The division type of the MIDI file.

See Also:

• Sequence.PPQ
• Sequence.SMPTE_24
• Sequence.SMPTE_25
• Sequence.SMPTE_30DROP
• Sequence.SMPTE_30

resolution

protected int resolution

The timing resolution of the MIDI file.

byteLength

protected int byteLength

The length of the MIDI file in bytes.

microsecondLength

protected long microsecondLength

The duration of the MIDI file in microseconds.

Constructor Details

MidiFileFormat

public MidiFileFormat(int type,
 float divisionType,
 int resolution,
 int bytes,
 long microseconds)

Constructs a MidiFileFormat.

Parameters:

type - the MIDI file type (0, 1, or 2)

divisionType - the timing division type (PPQ or one of the SMPTE types)

resolution - the timing resolution

bytes - the length of the MIDI file in bytes, or UNKNOWN_LENGTH if not known

microseconds - the duration of the file in microseconds, or UNKNOWN_LENGTH if not known

See Also:

• UNKNOWN_LENGTH
• Sequence.PPQ
• Sequence.SMPTE_24
• Sequence.SMPTE_25
• Sequence.SMPTE_30DROP
• Sequence.SMPTE_30

MidiFileFormat

public MidiFileFormat(int type,
 float divisionType,
 int resolution,
 int bytes,
 long microseconds,
 Map<String,Object> properties)

Construct a MidiFileFormat with a set of properties.

Parameters:

type - the MIDI file type (0, 1, or 2)

divisionType - the timing division type (PPQ or one of the SMPTE types)

resolution - the timing resolution

bytes - the length of the MIDI file in bytes, or UNKNOWN_LENGTH if not known

microseconds - the duration of the file in microseconds, or UNKNOWN_LENGTH if not known

properties - a Map<String,Object> object with properties

Since:

1.5

See Also:

• UNKNOWN_LENGTH
• Sequence.PPQ
• Sequence.SMPTE_24
• Sequence.SMPTE_25
• Sequence.SMPTE_30DROP
• Sequence.SMPTE_30

Method Details

getType

public int getType()

Obtains the MIDI file type.

Returns:

the file's type (0, 1, or 2)

getDivisionType

public float getDivisionType()

Obtains the timing division type for the MIDI file.

Returns:

the division type (PPQ or one of the SMPTE types)

See Also:

• Sequence(float, int)
• Sequence.PPQ
• Sequence.SMPTE_24
• Sequence.SMPTE_25
• Sequence.SMPTE_30DROP
• Sequence.SMPTE_30
• Sequence.getDivisionType()

getResolution

public int getResolution()

Obtains the timing resolution for the MIDI file. If the division type is PPQ, the resolution is specified in ticks per beat. For SMPTE timing, the resolution is specified in ticks per frame.

Returns:

the number of ticks per beat (PPQ) or per frame (SMPTE)

See Also:

• getDivisionType()
• Sequence.getResolution()

getByteLength

public int getByteLength()

Obtains the length of the MIDI file, expressed in 8-bit bytes.

Returns:

the number of bytes in the file, or UNKNOWN_LENGTH if not known

See Also:

• UNKNOWN_LENGTH

getMicrosecondLength

public long getMicrosecondLength()

Obtains the length of the MIDI file, expressed in microseconds.

Returns:

the file's duration in microseconds, or UNKNOWN_LENGTH if not known

See Also:

• Sequence.getMicrosecondLength()
• getByteLength()
• UNKNOWN_LENGTH

properties

public Map<String,Object> properties()

Obtain an unmodifiable map of properties. The concept of properties is further explained in the class description.

Returns:

a Map<String,Object> object containing all properties. If no properties are recognized, an empty map is returned.

Since:

1.5

See Also:

• getProperty(String)

getProperty

public Object getProperty(String key)

Obtain the property value specified by the key. The concept of properties is further explained in the class description.

If the specified property is not defined for a particular file format, this method returns null.

Parameters:

key - the key of the desired property

Returns:

the value of the property with the specified key, or null if the property does not exist

Since:

1.5

See Also:

• properties()