Java javax.sound.midi Interface Synthesizer（JDK8）

Method Detail

• getMaxPolyphony

  int getMaxPolyphony()

  Obtains the maximum number of notes that this synthesizer can sound simultaneously.

  Returns:

  the maximum number of simultaneous notes

  See Also:

  getVoiceStatus()

• getLatency

  long getLatency()

  Obtains the processing latency incurred by this synthesizer, expressed in microseconds. This latency measures the worst-case delay between the time a MIDI message is delivered to the synthesizer and the time that the synthesizer actually produces the corresponding result.

  Although the latency is expressed in microseconds, a synthesizer's actual measured delay may vary over a wider range than this resolution suggests. For example, a synthesizer might have a worst-case delay of a few milliseconds or more.

  Returns:

  the worst-case delay, in microseconds

• getChannels

  MidiChannel[] getChannels()

  Obtains the set of MIDI channels controlled by this synthesizer. Each non-null element in the returned array is a MidiChannel that receives the MIDI messages sent on that channel number.

  The MIDI 1.0 specification provides for 16 channels, so this method returns an array of at least 16 elements. However, if this synthesizer doesn't make use of all 16 channels, some of the elements of the array might be null, so you should check each element before using it.

  Returns:

  an array of the MidiChannel objects managed by this Synthesizer. Some of the array elements may be null.

• getVoiceStatus

  VoiceStatus[] getVoiceStatus()

  Obtains the current status of the voices produced by this synthesizer. If this class of Synthesizer does not provide voice information, the returned array will always be of length 0. Otherwise, its length is always equal to the total number of voices, as returned by getMaxPolyphony(). (See the VoiceStatus class description for an explanation of synthesizer voices.)

  Returns:

  an array of VoiceStatus objects that supply information about the corresponding synthesizer voices

  See Also:

  getMaxPolyphony(), VoiceStatus

• isSoundbankSupported

  boolean isSoundbankSupported(Soundbank soundbank)

  Informs the caller whether this synthesizer is capable of loading instruments from the specified soundbank. If the soundbank is unsupported, any attempts to load instruments from it will result in an IllegalArgumentException.

  Parameters:

  soundbank - soundbank for which support is queried

  Returns:

  true if the soundbank is supported, otherwise false

  See Also:

  loadInstruments(javax.sound.midi.Soundbank, javax.sound.midi.Patch[]), loadAllInstruments(javax.sound.midi.Soundbank), unloadInstruments(javax.sound.midi.Soundbank, javax.sound.midi.Patch[]), unloadAllInstruments(javax.sound.midi.Soundbank), getDefaultSoundbank()

• loadInstrument

  boolean loadInstrument(Instrument instrument)

  Makes a particular instrument available for synthesis. This instrument is loaded into the patch location specified by its Patch object, so that if a program-change message is received (or has been received) that causes that patch to be selected, subsequent notes will be played using the sound of instrument. If the specified instrument is already loaded, this method does nothing and returns true.

  The instrument must be part of a soundbank that this Synthesizer supports. (To make sure, you can use the getSoundbank method of Instrument and the isSoundbankSupported method of Synthesizer.)

  Parameters:

  instrument - instrument to load

  Returns:

  true if the instrument is successfully loaded (or already had been), false if the instrument could not be loaded (for example, if the synthesizer has insufficient memory to load it)

  Throws:

  IllegalArgumentException - if this Synthesizer doesn't support the specified instrument's soundbank

  See Also:

  unloadInstrument(javax.sound.midi.Instrument), loadInstruments(javax.sound.midi.Soundbank, javax.sound.midi.Patch[]), loadAllInstruments(javax.sound.midi.Soundbank), remapInstrument(javax.sound.midi.Instrument, javax.sound.midi.Instrument), SoundbankResource.getSoundbank(), MidiChannel.programChange(int, int)

• unloadInstrument

  void unloadInstrument(Instrument instrument)

  Unloads a particular instrument.

  Parameters:

  instrument - instrument to unload

  Throws:

  IllegalArgumentException - if this Synthesizer doesn't support the specified instrument's soundbank

  See Also:

  loadInstrument(javax.sound.midi.Instrument), unloadInstruments(javax.sound.midi.Soundbank, javax.sound.midi.Patch[]), unloadAllInstruments(javax.sound.midi.Soundbank), getLoadedInstruments(), remapInstrument(javax.sound.midi.Instrument, javax.sound.midi.Instrument)

• remapInstrument

  boolean remapInstrument(Instrument from,
                          Instrument to)

  Remaps an instrument. Instrument to takes the place of instrument from.
  For example, if from was located at bank number 2, program number 11, remapping causes that bank and program location to be occupied instead by to.
  If the function succeeds, instrument from is unloaded.

  To cancel the remapping reload instrument from by invoking one of loadInstrument(javax.sound.midi.Instrument), loadInstruments(javax.sound.midi.Soundbank, javax.sound.midi.Patch[]) or loadAllInstruments(javax.sound.midi.Soundbank).

  Parameters:

  from - the Instrument object to be replaced

  to - the Instrument object to be used in place of the old instrument, it should be loaded into the synthesizer

  Returns:

  true if the instrument successfully remapped, false if feature is not implemented by synthesizer

  Throws:

  IllegalArgumentException - if instrument from or instrument to aren't supported by synthesizer or if instrument to is not loaded

  NullPointerException - if from or to parameters have null value

  See Also:

  loadInstrument(javax.sound.midi.Instrument), loadInstruments(javax.sound.midi.Soundbank, javax.sound.midi.Patch[]), loadAllInstruments(javax.sound.midi.Soundbank)

• getDefaultSoundbank

  Soundbank getDefaultSoundbank()

  Obtains the default soundbank for the synthesizer, if one exists. (Some synthesizers provide a default or built-in soundbank.) If a synthesizer doesn't have a default soundbank, instruments must be loaded explicitly from an external soundbank.

  Returns:

  default soundbank, or null if one does not exist.

  See Also:

  isSoundbankSupported(javax.sound.midi.Soundbank)

• getAvailableInstruments

  Instrument[] getAvailableInstruments()

  Obtains a list of instruments that come with the synthesizer. These instruments might be built into the synthesizer, or they might be part of a default soundbank provided with the synthesizer, etc.

  Note that you don't use this method to find out which instruments are currently loaded onto the synthesizer; for that purpose, you use getLoadedInstruments(). Nor does the method indicate all the instruments that can be loaded onto the synthesizer; it only indicates the subset that come with the synthesizer. To learn whether another instrument can be loaded, you can invoke isSoundbankSupported(), and if the instrument's Soundbank is supported, you can try loading the instrument.

  Returns:

  list of available instruments. If the synthesizer has no instruments coming with it, an array of length 0 is returned.

  See Also:

  getLoadedInstruments(), isSoundbankSupported(Soundbank), loadInstrument(javax.sound.midi.Instrument)

• getLoadedInstruments

  Instrument[] getLoadedInstruments()

  Obtains a list of the instruments that are currently loaded onto this Synthesizer.

  Returns:

  a list of currently loaded instruments

  See Also:

  loadInstrument(javax.sound.midi.Instrument), getAvailableInstruments(), Soundbank.getInstruments()

• loadAllInstruments

  boolean loadAllInstruments(Soundbank soundbank)

  Loads onto the Synthesizer all instruments contained in the specified Soundbank.

  Parameters:

  soundbank - the Soundbank whose are instruments are to be loaded

  Returns:

  true if the instruments are all successfully loaded (or already had been), false if any instrument could not be loaded (for example, if the Synthesizer had insufficient memory)

  Throws:

  IllegalArgumentException - if the requested soundbank is incompatible with this synthesizer.

  See Also:

  isSoundbankSupported(javax.sound.midi.Soundbank), loadInstrument(javax.sound.midi.Instrument), loadInstruments(javax.sound.midi.Soundbank, javax.sound.midi.Patch[])

• unloadAllInstruments

  void unloadAllInstruments(Soundbank soundbank)

  Unloads all instruments contained in the specified Soundbank.

  Parameters:

  soundbank - soundbank containing instruments to unload

  Throws:

  IllegalArgumentException - thrown if the soundbank is not supported.

  See Also:

  isSoundbankSupported(javax.sound.midi.Soundbank), unloadInstrument(javax.sound.midi.Instrument), unloadInstruments(javax.sound.midi.Soundbank, javax.sound.midi.Patch[])

• loadInstruments

  boolean loadInstruments(Soundbank soundbank,
                          Patch[] patchList)

  Loads the instruments referenced by the specified patches, from the specified Soundbank. Each of the Patch objects indicates a bank and program number; the Instrument that has the matching Patch is loaded into that bank and program location.

  Parameters:

  soundbank - the Soundbank containing the instruments to load

  patchList - list of patches for which instruments should be loaded

  Returns:

  true if the instruments are all successfully loaded (or already had been), false if any instrument could not be loaded (for example, if the Synthesizer had insufficient memory)

  Throws:

  IllegalArgumentException - thrown if the soundbank is not supported.

  See Also:

  isSoundbankSupported(javax.sound.midi.Soundbank), Instrument.getPatch(), loadAllInstruments(javax.sound.midi.Soundbank), loadInstrument(javax.sound.midi.Instrument), Soundbank.getInstrument(Patch), Sequence.getPatchList()

• unloadInstruments

  void unloadInstruments(Soundbank soundbank,
                         Patch[] patchList)

  Unloads the instruments referenced by the specified patches, from the MIDI sound bank specified.

  Parameters:

  soundbank - soundbank containing instruments to unload

  patchList - list of patches for which instruments should be unloaded

  Throws:

  IllegalArgumentException - thrown if the soundbank is not supported.

  See Also:

  unloadInstrument(javax.sound.midi.Instrument), unloadAllInstruments(javax.sound.midi.Soundbank), isSoundbankSupported(javax.sound.midi.Soundbank), Instrument.getPatch(), loadInstruments(javax.sound.midi.Soundbank, javax.sound.midi.Patch[])