- java.lang.Object
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- javax.sound.midi.Sequence
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public class Sequence extends Object
ASequenceis a data structure containing musical information (often an entire song or composition) that can be played back by aSequencerobject. Specifically, theSequencecontains timing information and one or more tracks. Eachtrackconsists of a series of MIDI events (such as note-ons, note-offs, program changes, and meta-events). The sequence's timing information specifies the type of unit that is used to time-stamp the events in the sequence.A
Sequencecan be created from a MIDI file by reading the file into an input stream and invoking one of thegetSequencemethods ofMidiSystem. A sequence can also be built from scratch by adding newTracksto an emptySequence, and addingMidiEventobjects to theseTracks.
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Field Summary
Fields Modifier and Type Field Description protected floatdivisionTypeThe timing division type of the sequence.static floatPPQThe tempo-based timing type, for which the resolution is expressed in pulses (ticks) per quarter note.protected intresolutionThe timing resolution of the sequence.static floatSMPTE_24The SMPTE-based timing type with 24 frames per second (resolution is expressed in ticks per frame).static floatSMPTE_25The SMPTE-based timing type with 25 frames per second (resolution is expressed in ticks per frame).static floatSMPTE_30The SMPTE-based timing type with 30 frames per second (resolution is expressed in ticks per frame).static floatSMPTE_30DROPThe SMPTE-based timing type with 29.97 frames per second (resolution is expressed in ticks per frame).protected Vector<Track>tracksThe MIDI tracks in this sequence.
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Constructor Summary
Constructors Constructor Description Sequence(float divisionType, int resolution)Constructs a new MIDI sequence with the specified timing division type and timing resolution.Sequence(float divisionType, int resolution, int numTracks)Constructs a new MIDI sequence with the specified timing division type, timing resolution, and number of tracks.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description TrackcreateTrack()Creates a new, initially empty track as part of this sequence.booleandeleteTrack(Track track)Removes the specified track from the sequence.floatgetDivisionType()Obtains the timing division type for this sequence.longgetMicrosecondLength()Obtains the duration of this sequence, expressed in microseconds.Patch[]getPatchList()Obtains a list of patches referenced in this sequence.intgetResolution()Obtains the timing resolution for this sequence.longgetTickLength()Obtains the duration of this sequence, expressed in MIDI ticks.Track[]getTracks()Obtains an array containing all the tracks in this sequence.
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Field Detail
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PPQ
public static final float PPQ
The tempo-based timing type, for which the resolution is expressed in pulses (ticks) per quarter note.- See Also:
Sequence(float, int), Constant Field Values
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SMPTE_24
public static final float SMPTE_24
The SMPTE-based timing type with 24 frames per second (resolution is expressed in ticks per frame).- See Also:
Sequence(float, int), Constant Field Values
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SMPTE_25
public static final float SMPTE_25
The SMPTE-based timing type with 25 frames per second (resolution is expressed in ticks per frame).- See Also:
Sequence(float, int), Constant Field Values
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SMPTE_30DROP
public static final float SMPTE_30DROP
The SMPTE-based timing type with 29.97 frames per second (resolution is expressed in ticks per frame).- See Also:
Sequence(float, int), Constant Field Values
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SMPTE_30
public static final float SMPTE_30
The SMPTE-based timing type with 30 frames per second (resolution is expressed in ticks per frame).- See Also:
Sequence(float, int), Constant Field Values
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divisionType
protected float divisionType
The timing division type of the sequence.- See Also:
PPQ,SMPTE_24,SMPTE_25,SMPTE_30DROP,SMPTE_30,getDivisionType()
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resolution
protected int resolution
The timing resolution of the sequence.- See Also:
getResolution()
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tracks
protected Vector<Track> tracks
The MIDI tracks in this sequence.- See Also:
getTracks()
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Constructor Detail
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Sequence
public Sequence(float divisionType, int resolution) throws InvalidMidiDataExceptionConstructs a new MIDI sequence with the specified timing division type and timing resolution. The division type must be one of the recognized MIDI timing types. For tempo-based timing,divisionTypeis PPQ (pulses per quarter note) and the resolution is specified in ticks per beat. For SMTPE timing,divisionTypespecifies the number of frames per second and the resolution is specified in ticks per frame. The sequence will contain no initial tracks. Tracks may be added to or removed from the sequence usingcreateTrack()anddeleteTrack(javax.sound.midi.Track).- Parameters:
divisionType- the timing division type (PPQ or one of the SMPTE types)resolution- the timing resolution- Throws:
InvalidMidiDataException- ifdivisionTypeis not valid- See Also:
PPQ,SMPTE_24,SMPTE_25,SMPTE_30DROP,SMPTE_30,getDivisionType(),getResolution(),getTracks()
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Sequence
public Sequence(float divisionType, int resolution, int numTracks) throws InvalidMidiDataExceptionConstructs a new MIDI sequence with the specified timing division type, timing resolution, and number of tracks. The division type must be one of the recognized MIDI timing types. For tempo-based timing,divisionTypeis PPQ (pulses per quarter note) and the resolution is specified in ticks per beat. For SMTPE timing,divisionTypespecifies the number of frames per second and the resolution is specified in ticks per frame. The sequence will be initialized with the number of tracks specified bynumTracks. These tracks are initially empty (i.e. they contain only the meta-event End of Track). The tracks may be retrieved for editing using thegetTracks()method. Additional tracks may be added, or existing tracks removed, usingcreateTrack()anddeleteTrack(javax.sound.midi.Track).- Parameters:
divisionType- the timing division type (PPQ or one of the SMPTE types)resolution- the timing resolutionnumTracks- the initial number of tracks in the sequence- Throws:
InvalidMidiDataException- ifdivisionTypeis not valid- See Also:
PPQ,SMPTE_24,SMPTE_25,SMPTE_30DROP,SMPTE_30,getDivisionType(),getResolution()
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Method Detail
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getDivisionType
public float getDivisionType()
Obtains the timing division type for this sequence.- Returns:
- the division type (PPQ or one of the SMPTE types)
- See Also:
PPQ,SMPTE_24,SMPTE_25,SMPTE_30DROP,SMPTE_30,Sequence(float, int),MidiFileFormat.getDivisionType()
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getResolution
public int getResolution()
Obtains the timing resolution for this sequence. If the sequence's division type is PPQ, the resolution is specified in ticks per beat. For SMTPE 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(float, int),MidiFileFormat.getResolution()
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createTrack
public Track createTrack()
Creates a new, initially empty track as part of this sequence. The track initially contains the meta-event End of Track. The newly created track is returned. All tracks in the sequence may be retrieved usinggetTracks(). Tracks may be removed from the sequence usingdeleteTrack(javax.sound.midi.Track).- Returns:
- the newly created track
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deleteTrack
public boolean deleteTrack(Track track)
Removes the specified track from the sequence.- Parameters:
track- the track to remove- Returns:
trueif the track existed in the track and was removed, otherwisefalse- See Also:
createTrack(),getTracks()
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getTracks
public Track[] getTracks()
Obtains an array containing all the tracks in this sequence. If the sequence contains no tracks, an array of length 0 is returned.- Returns:
- the array of tracks
- See Also:
createTrack(),deleteTrack(javax.sound.midi.Track)
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getMicrosecondLength
public long getMicrosecondLength()
Obtains the duration of this sequence, expressed in microseconds.- Returns:
- this sequence's duration in microseconds
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getTickLength
public long getTickLength()
Obtains the duration of this sequence, expressed in MIDI ticks.- Returns:
- this sequence's length in ticks
- See Also:
getMicrosecondLength()
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getPatchList
public Patch[] getPatchList()
Obtains a list of patches referenced in this sequence. This patch list may be used to load the requiredInstrumentobjects into aSynthesizer.- Returns:
- an array of
Patchobjects used in this sequence - See Also:
Synthesizer.loadInstruments(Soundbank, Patch[])
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