Class Track
- java.lang.Object
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- javax.sound.midi.Track
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public class Track extends Object
A MIDI track is an independent stream of MIDI events (time-stamped MIDI data) that can be stored along with other tracks in a standard MIDI file. The MIDI specification allows only 16 channels of MIDI data, but tracks are a way to get around this limitation. A MIDI file can contain any number of tracks, each containing its own stream of up to 16 channels of MIDI data.A
Trackoccupies a middle level in the hierarchy of data played by aSequencerThe timing information and resolution for a track is controlled by and stored in the sequence containing the track. A given
Trackis considered to belong to the particularSequenceSequence.createTrack()Trackconstructor.The
Trackclass provides methods to edit the track by adding or removingMidiEventobjects from it. These operations keep the event list in the correct time order. Methods are also included to obtain the track's size, in terms of either the number of events it contains or its duration in ticks.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description booleanadd(MidiEvent event)Adds a new event to the track.MidiEventget(int index)Obtains the event at the specified index.booleanremove(MidiEvent event)Removes the specified event from the track.intsize()Obtains the number of events in this track.longticks()Obtains the length of the track, expressed in MIDI ticks.
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Method Detail
add
public boolean add(MidiEvent event)
Adds a new event to the track. However, if the event is already contained in the track, it is not added again. The list of events is kept in time order, meaning that this event inserted at the appropriate place in the list, not necessarily at the end.- Parameters:
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event- the event to add - Returns:
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trueif the event did not already exist in the track and was added, otherwisefalse
remove
public boolean remove(MidiEvent event)
Removes the specified event from the track.- Parameters:
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event- the event to remove - Returns:
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trueif the event existed in the track and was removed, otherwisefalse
get
public MidiEvent get(int index) throws ArrayIndexOutOfBoundsException
Obtains the event at the specified index.- Parameters:
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index- the location of the desired event in the event vector - Returns:
- the event at the specified index
- Throws:
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ArrayIndexOutOfBoundsException- if the specified index is negative or not less than the current size of this track. - See Also:
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size()
size
public int size()
Obtains the number of events in this track.- Returns:
- the size of the track's event vector
ticks
public long ticks()
Obtains the length of the track, expressed in MIDI ticks. (The duration of a tick in seconds is determined by the timing resolution of theSequencecontaining this track, and also by the tempo of the music as set by the sequencer.)- Returns:
- the duration, in ticks
- See Also:
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Sequence.Sequence(float, int),Sequencer.setTempoInBPM(float),Sequencer.getTickPosition()
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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