File	Doc	Category	Size	Date	Package
MidiSystem.java	API Doc	Java SE 6 API	51702	Tue Jun 10 00:26:30 BST 2008	javax.sound.midi

MidiSystem

• java.lang.Object

Fields Summary

Constructors Summary
private MidiSystem() Private no-args constructor for ensuring against instantiation.

Methods Summary
private static javax.sound.midi.MidiDevice	getDefaultDevice(java.lang.Class deviceClass) Attempts to locate and return a default MidiDevice of the specified type. param deviceClass The requested device type, one of Synthesizer.class, Sequencer.class, Receiver.class or Transmitter.class. throws IllegalArgumentException on failure. List providers = getMidiDeviceProviders(); String providerClassName = JDK13Services.getDefaultProviderClassName(deviceClass); String instanceName = JDK13Services.getDefaultInstanceName(deviceClass); MidiDevice device; if (providerClassName != null) { MidiDeviceProvider defaultProvider = getNamedProvider(providerClassName, providers); if (defaultProvider != null) { if (instanceName != null) { device = getNamedDevice(instanceName, defaultProvider, deviceClass); if (device != null) { return device; } } device = getFirstDevice(defaultProvider, deviceClass); if (device != null) { return device; } } } /* Provider class not specified or cannot be found, or provider class specified, and no appropriate device available or provider class and instance specified and instance cannot be found or is not appropriate */ if (instanceName != null) { device = getNamedDevice(instanceName, providers, deviceClass); if (device != null) { return device; } } /* No default are specified, or if something is specified, everything failed. */ device = getFirstDevice(providers, deviceClass); if (device != null) { return device; } throw new IllegalArgumentException("Requested device not installed");
private static javax.sound.midi.MidiDevice	getDefaultDeviceWrapper(java.lang.Class deviceClass) Attempts to locate and return a default MidiDevice of the specified type. This method wraps {@link #getDefaultDevice}. It catches the IllegalArgumentException thrown by getDefaultDevice and instead throws a MidiUnavailableException, with the catched exception chained. param deviceClass The requested device type, one of Synthesizer.class, Sequencer.class, Receiver.class or Transmitter.class. throws MidiUnavalableException on failure. try { return getDefaultDevice(deviceClass); } catch (IllegalArgumentException iae) { MidiUnavailableException mae = new MidiUnavailableException(); mae.initCause(iae); throw mae; }
private static javax.sound.midi.MidiDevice	getFirstDevice(javax.sound.midi.spi.MidiDeviceProvider provider, java.lang.Class deviceClass) From a given MidiDeviceProvider, return the first appropriate device. param provider The MidiDeviceProvider to check for MidiDevices. param deviceClass The requested device type, one of Synthesizer.class, Sequencer.class, Receiver.class or Transmitter.class. return A MidiDevice is considered appropriate, or null if no appropriate device is found. MidiDevice device; // try to get MIDI port device = getFirstDevice(provider, deviceClass, false, false); if (device != null) { return device; } if (deviceClass == Receiver.class) { // try to get Synthesizer device = getFirstDevice(provider, deviceClass, true, false); if (device != null) { return device; } } return null;
private static javax.sound.midi.MidiDevice	getFirstDevice(javax.sound.midi.spi.MidiDeviceProvider provider, java.lang.Class deviceClass, boolean allowSynthesizer, boolean allowSequencer) From a given MidiDeviceProvider, return the first appropriate device. param provider The MidiDeviceProvider to check for MidiDevices. param deviceClass The requested device type, one of Synthesizer.class, Sequencer.class, Receiver.class or Transmitter.class. return A MidiDevice is considered appropriate, or null if no appropriate device is found. MidiDevice.Info[] infos = provider.getDeviceInfo(); for (int j = 0; j < infos.length; j++) { MidiDevice device = provider.getDevice(infos[j]); if (isAppropriateDevice(device, deviceClass, allowSynthesizer, allowSequencer)) { return device; } } return null;
private static javax.sound.midi.MidiDevice	getFirstDevice(java.util.List providers, java.lang.Class deviceClass) From a List of MidiDeviceProviders, return the first appropriate MidiDevice. param providers The List of MidiDeviceProviders to search. param deviceClass The requested device type, one of Synthesizer.class, Sequencer.class, Receiver.class or Transmitter.class. return A MidiDevice that is considered appropriate, or null if none is found. MidiDevice device; // try to get MIDI port device = getFirstDevice(providers, deviceClass, false, false); if (device != null) { return device; } if (deviceClass == Receiver.class) { // try to get Synthesizer device = getFirstDevice(providers, deviceClass, true, false); if (device != null) { return device; } } return null;
private static javax.sound.midi.MidiDevice	getFirstDevice(java.util.List providers, java.lang.Class deviceClass, boolean allowSynthesizer, boolean allowSequencer) From a List of MidiDeviceProviders, return the first appropriate MidiDevice. param providers The List of MidiDeviceProviders to search. param deviceClass The requested device type, one of Synthesizer.class, Sequencer.class, Receiver.class or Transmitter.class. return A MidiDevice that is considered appropriate, or null if none is found. for(int i = 0; i < providers.size(); i++) { MidiDeviceProvider provider = (MidiDeviceProvider) providers.get(i); MidiDevice device = getFirstDevice(provider, deviceClass, allowSynthesizer, allowSequencer); if (device != null) { return device; } } return null;
public static javax.sound.midi.MidiDevice	getMidiDevice(javax.sound.midi.MidiDevice$Info info) Obtains the requested MIDI device. param info a device information object representing the desired device. return the requested device throws MidiUnavailableException if the requested device is not available due to resource restrictions throws IllegalArgumentException if the info object does not represent a MIDI device installed on the system see #getMidiDeviceInfo List providers = getMidiDeviceProviders(); for(int i = 0; i < providers.size(); i++) { MidiDeviceProvider provider = (MidiDeviceProvider) providers.get(i); if (provider.isDeviceSupported(info)) { MidiDevice device = provider.getDevice(info); return device; } } throw new IllegalArgumentException("Requested device not installed: " + info);
public static javax.sound.midi.MidiDevice$Info[]	getMidiDeviceInfo() Obtains an array of information objects representing the set of all MIDI devices available on the system. A returned information object can then be used to obtain the corresponding device object, by invoking {@link #getMidiDevice(MidiDevice.Info) getMidiDevice}. return an array of MidiDevice.Info objects, one for each installed MIDI device. If no such devices are installed, an array of length 0 is returned. List allInfos = new ArrayList(); List providers = getMidiDeviceProviders(); for(int i = 0; i < providers.size(); i++) { MidiDeviceProvider provider = (MidiDeviceProvider) providers.get(i); MidiDevice.Info[] tmpinfo = provider.getDeviceInfo(); for (int j = 0; j < tmpinfo.length; j++) { allInfos.add( tmpinfo[j] ); } } MidiDevice.Info[] infosArray = (MidiDevice.Info[]) allInfos.toArray(new MidiDevice.Info[0]); return infosArray;
private static java.util.List	getMidiDeviceProviders() return getProviders(MidiDeviceProvider.class);
public static javax.sound.midi.MidiFileFormat	getMidiFileFormat(java.io.InputStream stream) Obtains the MIDI file format of the data in the specified input stream. The stream must point to valid MIDI file data for a file type recognized by the system. This method and/or the code it invokes may need to read some data from the stream to determine whether its data format is supported. The implementation may therefore need to mark the stream, read enough data to determine whether it is in a supported format, and reset the stream's read pointer to its original position. If the input stream does not permit this set of operations, this method may fail with an IOException. This operation can only succeed for files of a type which can be parsed by an installed file reader. It may fail with an InvalidMidiDataException even for valid files if no compatible file reader is installed. It will also fail with an InvalidMidiDataException if a compatible file reader is installed, but encounters errors while determining the file format. param stream the input stream from which file format information should be extracted return an MidiFileFormat object describing the MIDI file format throws InvalidMidiDataException if the stream does not point to valid MIDI file data recognized by the system throws IOException if an I/O exception occurs while accessing the stream see #getMidiFileFormat(URL) see #getMidiFileFormat(File) see InputStream#markSupported see InputStream#mark List providers = getMidiFileReaders(); MidiFileFormat format = null; for(int i = 0; i < providers.size(); i++) { MidiFileReader reader = (MidiFileReader) providers.get(i); try { format = reader.getMidiFileFormat( stream ); // throws IOException break; } catch (InvalidMidiDataException e) { continue; } } if( format==null ) { throw new InvalidMidiDataException("input stream is not a supported file type"); } else { return format; }
public static javax.sound.midi.MidiFileFormat	getMidiFileFormat(java.net.URL url) Obtains the MIDI file format of the data in the specified URL. The URL must point to valid MIDI file data for a file type recognized by the system. This operation can only succeed for files of a type which can be parsed by an installed file reader. It may fail with an InvalidMidiDataException even for valid files if no compatible file reader is installed. It will also fail with an InvalidMidiDataException if a compatible file reader is installed, but encounters errors while determining the file format. param url the URL from which file format information should be extracted return a MidiFileFormat object describing the MIDI file format throws InvalidMidiDataException if the URL does not point to valid MIDI file data recognized by the system throws IOException if an I/O exception occurs while accessing the URL see #getMidiFileFormat(InputStream) see #getMidiFileFormat(File) List providers = getMidiFileReaders(); MidiFileFormat format = null; for(int i = 0; i < providers.size(); i++) { MidiFileReader reader = (MidiFileReader) providers.get(i); try { format = reader.getMidiFileFormat( url ); // throws IOException break; } catch (InvalidMidiDataException e) { continue; } } if( format==null ) { throw new InvalidMidiDataException("url is not a supported file type"); } else { return format; }
public static javax.sound.midi.MidiFileFormat	getMidiFileFormat(java.io.File file) Obtains the MIDI file format of the specified File. The File must point to valid MIDI file data for a file type recognized by the system. This operation can only succeed for files of a type which can be parsed by an installed file reader. It may fail with an InvalidMidiDataException even for valid files if no compatible file reader is installed. It will also fail with an InvalidMidiDataException if a compatible file reader is installed, but encounters errors while determining the file format. param file the File from which file format information should be extracted return a MidiFileFormat object describing the MIDI file format throws InvalidMidiDataException if the File does not point to valid MIDI file data recognized by the system throws IOException if an I/O exception occurs while accessing the file see #getMidiFileFormat(InputStream) see #getMidiFileFormat(URL) List providers = getMidiFileReaders(); MidiFileFormat format = null; for(int i = 0; i < providers.size(); i++) { MidiFileReader reader = (MidiFileReader) providers.get(i); try { format = reader.getMidiFileFormat( file ); // throws IOException break; } catch (InvalidMidiDataException e) { continue; } } if( format==null ) { throw new InvalidMidiDataException("file is not a supported file type"); } else { return format; }
private static java.util.List	getMidiFileReaders() return getProviders(MidiFileReader.class);
public static int[]	getMidiFileTypes() Obtains the set of MIDI file types for which file writing support is provided by the system. return array of unique file types. If no file types are supported, an array of length 0 is returned. List providers = getMidiFileWriters(); Set allTypes = new HashSet(); // gather from all the providers for (int i = 0; i < providers.size(); i++ ) { MidiFileWriter writer = (MidiFileWriter) providers.get(i); int[] types = writer.getMidiFileTypes(); for (int j = 0; j < types.length; j++ ) { allTypes.add(new Integer(types[j])); } } int resultTypes[] = new int[allTypes.size()]; int index = 0; Iterator iterator = allTypes.iterator(); while (iterator.hasNext()) { Integer integer = (Integer) iterator.next(); resultTypes[index++] = integer.intValue(); } return resultTypes;
public static int[]	getMidiFileTypes(javax.sound.midi.Sequence sequence) Obtains the set of MIDI file types that the system can write from the sequence specified. param sequence the sequence for which MIDI file type support is queried return the set of unique supported file types. If no file types are supported, returns an array of length 0. List providers = getMidiFileWriters(); Set allTypes = new HashSet(); // gather from all the providers for (int i = 0; i < providers.size(); i++ ) { MidiFileWriter writer = (MidiFileWriter) providers.get(i); int[] types = writer.getMidiFileTypes(sequence); for (int j = 0; j < types.length; j++ ) { allTypes.add(new Integer(types[j])); } } int resultTypes[] = new int[allTypes.size()]; int index = 0; Iterator iterator = allTypes.iterator(); while (iterator.hasNext()) { Integer integer = (Integer) iterator.next(); resultTypes[index++] = integer.intValue(); } return resultTypes;
private static java.util.List	getMidiFileWriters() return getProviders(MidiFileWriter.class);
private static javax.sound.midi.MidiDevice	getNamedDevice(java.lang.String deviceName, javax.sound.midi.spi.MidiDeviceProvider provider, java.lang.Class deviceClass) Return a MidiDevice with a given name from a given MidiDeviceProvider. param deviceName The name of the MidiDevice to be returned. param provider The MidiDeviceProvider to check for MidiDevices. param deviceClass The requested device type, one of Synthesizer.class, Sequencer.class, Receiver.class or Transmitter.class. return A MidiDevice matching the requirements, or null if none is found. MidiDevice device; // try to get MIDI port device = getNamedDevice(deviceName, provider, deviceClass, false, false); if (device != null) { return device; } if (deviceClass == Receiver.class) { // try to get Synthesizer device = getNamedDevice(deviceName, provider, deviceClass, true, false); if (device != null) { return device; } } return null;
private static javax.sound.midi.MidiDevice	getNamedDevice(java.lang.String deviceName, javax.sound.midi.spi.MidiDeviceProvider provider, java.lang.Class deviceClass, boolean allowSynthesizer, boolean allowSequencer) Return a MidiDevice with a given name from a given MidiDeviceProvider. param deviceName The name of the MidiDevice to be returned. param provider The MidiDeviceProvider to check for MidiDevices. param deviceClass The requested device type, one of Synthesizer.class, Sequencer.class, Receiver.class or Transmitter.class. return A MidiDevice matching the requirements, or null if none is found. MidiDevice.Info[] infos = provider.getDeviceInfo(); for (int i = 0; i < infos.length; i++) { if (infos[i].getName().equals(deviceName)) { MidiDevice device = provider.getDevice(infos[i]); if (isAppropriateDevice(device, deviceClass, allowSynthesizer, allowSequencer)) { return device; } } } return null;
private static javax.sound.midi.MidiDevice	getNamedDevice(java.lang.String deviceName, java.util.List providers, java.lang.Class deviceClass) Return a MidiDevice with a given name from a list of MidiDeviceProviders. param deviceName The name of the MidiDevice to be returned. param providers The List of MidiDeviceProviders to check for MidiDevices. param deviceClass The requested device type, one of Synthesizer.class, Sequencer.class, Receiver.class or Transmitter.class. return A Mixer matching the requirements, or null if none is found. MidiDevice device; // try to get MIDI port device = getNamedDevice(deviceName, providers, deviceClass, false, false); if (device != null) { return device; } if (deviceClass == Receiver.class) { // try to get Synthesizer device = getNamedDevice(deviceName, providers, deviceClass, true, false); if (device != null) { return device; } } return null;
private static javax.sound.midi.MidiDevice	getNamedDevice(java.lang.String deviceName, java.util.List providers, java.lang.Class deviceClass, boolean allowSynthesizer, boolean allowSequencer) Return a MidiDevice with a given name from a list of MidiDeviceProviders. param deviceName The name of the MidiDevice to be returned. param providers The List of MidiDeviceProviders to check for MidiDevices. param deviceClass The requested device type, one of Synthesizer.class, Sequencer.class, Receiver.class or Transmitter.class. return A Mixer matching the requirements, or null if none is found. for(int i = 0; i < providers.size(); i++) { MidiDeviceProvider provider = (MidiDeviceProvider) providers.get(i); MidiDevice device = getNamedDevice(deviceName, provider, deviceClass, allowSynthesizer, allowSequencer); if (device != null) { return device; } } return null;
private static javax.sound.midi.spi.MidiDeviceProvider	getNamedProvider(java.lang.String providerClassName, java.util.List providers) Return a MidiDeviceProcider of a given class from the list of MidiDeviceProviders. param providerClassName The class name of the provider to be returned. param provider The list of MidiDeviceProviders that is searched. return A MidiDeviceProvider of the requested class, or null if none is found. for(int i = 0; i < providers.size(); i++) { MidiDeviceProvider provider = (MidiDeviceProvider) providers.get(i); if (provider.getClass().getName().equals(providerClassName)) { return provider; } } return null;
private static java.util.List	getProviders(java.lang.Class providerClass) Obtains the set of services currently installed on the system using sun.misc.Service, the SPI mechanism in 1.3. return a List of instances of providers for the requested service. If no providers are available, a List of length 0 will be returned. return JDK13Services.getProviders(providerClass);
public static javax.sound.midi.Receiver	getReceiver() Obtains a MIDI receiver from an external MIDI port or other default device. If the system property javax.sound.midi.Receiver is defined or it is defined in the file "sound.properties", it is used to identify the device that provides the default receiver. For details, refer to the {@link MidiSystem class description}. If a suitable MIDI port is not available, the Receiver is retrieved from an installed synthesizer. If this method returns successfully, the {@link javax.sound.midi.MidiDevice MidiDevice} the Receiver belongs to is opened implicitly, if it is not already open. It is possible to close an implicitly opened device by calling {@link javax.sound.midi.Receiver#close close} on the returned Receiver. All open Receiver instances have to be closed in order to release system resources hold by the MidiDevice. For a detailed description of open/close behaviour see the class description of {@link javax.sound.midi.MidiDevice MidiDevice}. return the default MIDI receiver throws MidiUnavailableException if the default receiver is not available due to resource restrictions, or no device providing receivers is installed in the system // may throw MidiUnavailableException MidiDevice device = getDefaultDeviceWrapper(Receiver.class); Receiver receiver; if (device instanceof ReferenceCountingDevice) { receiver = ((ReferenceCountingDevice) device).getReceiverReferenceCounting(); } else { receiver = device.getReceiver(); } return receiver;
public static javax.sound.midi.Sequence	getSequence(java.io.InputStream stream) Obtains a MIDI sequence from the specified input stream. The stream must point to valid MIDI file data for a file type recognized by the system. This method and/or the code it invokes may need to read some data from the stream to determine whether its data format is supported. The implementation may therefore need to mark the stream, read enough data to determine whether it is in a supported format, and reset the stream's read pointer to its original position. If the input stream does not permit this set of operations, this method may fail with an IOException. This operation can only succeed for files of a type which can be parsed by an installed file reader. It may fail with an InvalidMidiDataException even for valid files if no compatible file reader is installed. It will also fail with an InvalidMidiDataException if a compatible file reader is installed, but encounters errors while constructing the Sequence object from the file data. param stream the input stream from which the Sequence should be constructed return a Sequence object based on the MIDI file data contained in the input stream throws InvalidMidiDataException if the stream does not point to valid MIDI file data recognized by the system throws IOException if an I/O exception occurs while accessing the stream see InputStream#markSupported see InputStream#mark List providers = getMidiFileReaders(); Sequence sequence = null; for(int i = 0; i < providers.size(); i++) { MidiFileReader reader = (MidiFileReader) providers.get(i); try { sequence = reader.getSequence( stream ); // throws IOException break; } catch (InvalidMidiDataException e) { continue; } } if( sequence==null ) { throw new InvalidMidiDataException("could not get sequence from input stream"); } else { return sequence; }
public static javax.sound.midi.Sequence	getSequence(java.net.URL url) Obtains a MIDI sequence from the specified URL. The URL must point to valid MIDI file data for a file type recognized by the system. This operation can only succeed for files of a type which can be parsed by an installed file reader. It may fail with an InvalidMidiDataException even for valid files if no compatible file reader is installed. It will also fail with an InvalidMidiDataException if a compatible file reader is installed, but encounters errors while constructing the Sequence object from the file data. param url the URL from which the Sequence should be constructed return a Sequence object based on the MIDI file data pointed to by the URL throws InvalidMidiDataException if the URL does not point to valid MIDI file data recognized by the system throws IOException if an I/O exception occurs while accessing the URL List providers = getMidiFileReaders(); Sequence sequence = null; for(int i = 0; i < providers.size(); i++) { MidiFileReader reader = (MidiFileReader) providers.get(i); try { sequence = reader.getSequence( url ); // throws IOException break; } catch (InvalidMidiDataException e) { continue; } } if( sequence==null ) { throw new InvalidMidiDataException("could not get sequence from URL"); } else { return sequence; }
public static javax.sound.midi.Sequence	getSequence(java.io.File file) Obtains a MIDI sequence from the specified File. The File must point to valid MIDI file data for a file type recognized by the system. This operation can only succeed for files of a type which can be parsed by an installed file reader. It may fail with an InvalidMidiDataException even for valid files if no compatible file reader is installed. It will also fail with an InvalidMidiDataException if a compatible file reader is installed, but encounters errors while constructing the Sequence object from the file data. param file the File from which the Sequence should be constructed return a Sequence object based on the MIDI file data pointed to by the File throws InvalidMidiDataException if the File does not point to valid MIDI file data recognized by the system throws IOException if an I/O exception occurs List providers = getMidiFileReaders(); Sequence sequence = null; for(int i = 0; i < providers.size(); i++) { MidiFileReader reader = (MidiFileReader) providers.get(i); try { sequence = reader.getSequence( file ); // throws IOException break; } catch (InvalidMidiDataException e) { continue; } } if( sequence==null ) { throw new InvalidMidiDataException("could not get sequence from file"); } else { return sequence; }
public static javax.sound.midi.Sequencer	getSequencer() Obtains the default Sequencer, connected to a default device. The returned Sequencer instance is connected to the default Synthesizer, as returned by {@link #getSynthesizer}. If there is no Synthesizer available, or the default Synthesizer cannot be opened, the sequencer is connected to the default Receiver, as returned by {@link #getReceiver}. The connection is made by retrieving a Transmitter instance from the Sequencer and setting its Receiver. Closing and re-opening the sequencer will restore the connection to the default device. This method is equivalent to calling getSequencer(true). If the system property javax.sound.midi.Sequencer is defined or it is defined in the file "sound.properties", it is used to identify the default sequencer. For details, refer to the {@link MidiSystem class description}. return the default sequencer, connected to a default Receiver throws MidiUnavailableException if the sequencer is not available due to resource restrictions, or there is no Receiver available by any installed MidiDevice, or no sequencer is installed in the system. see #getSequencer(boolean) see #getSynthesizer see #getReceiver return getSequencer(true);
public static javax.sound.midi.Sequencer	getSequencer(boolean connected) Obtains the default Sequencer, optionally connected to a default device. If connected is true, the returned Sequencer instance is connected to the default Synthesizer, as returned by {@link #getSynthesizer}. If there is no Synthesizer available, or the default Synthesizer cannot be opened, the sequencer is connected to the default Receiver, as returned by {@link #getReceiver}. The connection is made by retrieving a Transmitter instance from the Sequencer and setting its Receiver. Closing and re-opening the sequencer will restore the connection to the default device. If connected is false, the returned Sequencer instance is not connected, it has no open Transmitters. In order to play the sequencer on a MIDI device, or a Synthesizer, it is necessary to get a Transmitter and set its Receiver. If the system property javax.sound.midi.Sequencer is defined or it is defined in the file "sound.properties", it is used to identify the default sequencer. For details, refer to the {@link MidiSystem class description}. return the default sequencer throws MidiUnavailableException if the sequencer is not available due to resource restrictions, or no sequencer is installed in the system, or if connected is true, and there is no Receiver available by any installed MidiDevice see #getSynthesizer see #getReceiver since 1.5 Sequencer seq = (Sequencer) getDefaultDeviceWrapper(Sequencer.class); if (connected) { // IMPORTANT: this code needs to be synch'ed with // all AutoConnectSequencer instances, // (e.g. RealTimeSequencer) because the // same algorithm for synth retrieval // needs to be used! Receiver rec = null; MidiUnavailableException mue = null; // first try to connect to the default synthesizer try { Synthesizer synth = getSynthesizer(); if (synth instanceof ReferenceCountingDevice) { rec = ((ReferenceCountingDevice) synth).getReceiverReferenceCounting(); // only use MixerSynth if it could successfully load a soundbank if (synth.getClass().toString().contains("com.sun.media.sound.MixerSynth") && (synth.getDefaultSoundbank() == null)) { // don't use this receiver if no soundbank available rec = null; synth.close(); } } else { synth.open(); try { rec = synth.getReceiver(); } finally { // make sure that the synth is properly closed if (rec == null) { synth.close(); } } } } catch (MidiUnavailableException e) { // something went wrong with synth if (e instanceof MidiUnavailableException) { mue = (MidiUnavailableException) e; } } if (rec == null) { // then try to connect to the default Receiver try { rec = MidiSystem.getReceiver(); } catch (Exception e) { // something went wrong. Nothing to do then! if (e instanceof MidiUnavailableException) { mue = (MidiUnavailableException) e; } } } if (rec != null) { seq.getTransmitter().setReceiver(rec); if (seq instanceof AutoConnectSequencer) { ((AutoConnectSequencer) seq).setAutoConnect(rec); } } else { if (mue != null) { throw mue; } throw new MidiUnavailableException("no receiver available"); } } return seq;
public static javax.sound.midi.Soundbank	getSoundbank(java.net.URL url) Constructs a Soundbank by reading it from the specified URL. The URL must point to a valid MIDI soundbank file. param url the source of the sound bank data return the sound bank throws InvalidMidiDataException if the URL does not point to valid MIDI soundbank data recognized by the system throws IOException if an I/O error occurred when loading the soundbank SoundbankReader sp = null; Soundbank s = null; List providers = getSoundbankReaders(); for(int i = 0; i < providers.size(); i++) { sp = (SoundbankReader)providers.get(i); s = sp.getSoundbank(url); if( s!= null) { return s; } } throw new InvalidMidiDataException("cannot get soundbank from stream");
public static javax.sound.midi.Soundbank	getSoundbank(java.io.File file) Constructs a Soundbank by reading it from the specified File. The File must point to a valid MIDI soundbank file. param file the source of the sound bank data return the sound bank throws InvalidMidiDataException if the File does not point to valid MIDI soundbank data recognized by the system throws IOException if an I/O error occurred when loading the soundbank SoundbankReader sp = null; Soundbank s = null; List providers = getSoundbankReaders(); for(int i = 0; i < providers.size(); i++) { sp = (SoundbankReader)providers.get(i); s = sp.getSoundbank(file); if( s!= null) { return s; } } throw new InvalidMidiDataException("cannot get soundbank from stream");
public static javax.sound.midi.Soundbank	getSoundbank(java.io.InputStream stream) Constructs a MIDI sound bank by reading it from the specified stream. The stream must point to a valid MIDI soundbank file. In general, MIDI soundbank providers may need to read some data from the stream before determining whether they support it. These parsers must be able to mark the stream, read enough data to determine whether they support the stream, and, if not, reset the stream's read pointer to its original position. If the input stream does not support this, this method may fail with an IOException. param stream the source of the sound bank data. return the sound bank throws InvalidMidiDataException if the stream does not point to valid MIDI soundbank data recognized by the system throws IOException if an I/O error occurred when loading the soundbank see InputStream#markSupported see InputStream#mark SoundbankReader sp = null; Soundbank s = null; List providers = getSoundbankReaders(); for(int i = 0; i < providers.size(); i++) { sp = (SoundbankReader)providers.get(i); s = sp.getSoundbank(stream); if( s!= null) { return s; } } throw new InvalidMidiDataException("cannot get soundbank from stream");
private static java.util.List	getSoundbankReaders() return getProviders(SoundbankReader.class);
public static javax.sound.midi.Synthesizer	getSynthesizer() Obtains the default synthesizer. If the system property javax.sound.midi.Synthesizer is defined or it is defined in the file "sound.properties", it is used to identify the default synthesizer. For details, refer to the {@link MidiSystem class description}. return the default synthesizer throws MidiUnavailableException if the synthesizer is not available due to resource restrictions, or no synthesizer is installed in the system // may throw MidiUnavailableException return (Synthesizer) getDefaultDeviceWrapper(Synthesizer.class);
public static javax.sound.midi.Transmitter	getTransmitter() Obtains a MIDI transmitter from an external MIDI port or other default source. If the system property javax.sound.midi.Transmitter is defined or it is defined in the file "sound.properties", it is used to identify the device that provides the default transmitter. For details, refer to the {@link MidiSystem class description}. If this method returns successfully, the {@link javax.sound.midi.MidiDevice MidiDevice} the Transmitter belongs to is opened implicitly, if it is not already open. It is possible to close an implicitly opened device by calling {@link javax.sound.midi.Transmitter#close close} on the returned Transmitter. All open Transmitter instances have to be closed in order to release system resources hold by the MidiDevice. For a detailed description of open/close behaviour see the class description of {@link javax.sound.midi.MidiDevice MidiDevice}. return the default MIDI transmitter throws MidiUnavailableException if the default transmitter is not available due to resource restrictions, or no device providing transmitters is installed in the system // may throw MidiUnavailableException MidiDevice device = getDefaultDeviceWrapper(Transmitter.class); Transmitter transmitter; if (device instanceof ReferenceCountingDevice) { transmitter = ((ReferenceCountingDevice) device).getTransmitterReferenceCounting(); } else { transmitter = device.getTransmitter(); } return transmitter;
private static boolean	isAppropriateDevice(javax.sound.midi.MidiDevice device, java.lang.Class deviceClass, boolean allowSynthesizer, boolean allowSequencer) Checks if a MidiDevice is appropriate. If deviceClass is Synthesizer or Sequencer, a device implementing the respective interface is considered appropriate. If deviceClass is Receiver or Transmitter, a device is considered appropriate if it implements neither Synthesizer nor Transmitter, and if it can provide at least one Receiver or Transmitter, respectively. param device the MidiDevice to test param allowSynthesizer if true, Synthesizers are considered appropriate. Otherwise only pure MidiDevices are considered appropriate (unless allowSequencer is true). This flag only has an effect for deviceClass Receiver and Transmitter. For other device classes (Sequencer and Synthesizer), this flag has no effect. param allowSequencer if true, Sequencers are considered appropriate. Otherwise only pure MidiDevices are considered appropriate (unless allowSynthesizer is true). This flag only has an effect for deviceClass Receiver and Transmitter. For other device classes (Sequencer and Synthesizer), this flag has no effect. return true if the device is considered appropriate according to the rules given above, false otherwise. if (deviceClass.isInstance(device)) { // This clause is for deviceClass being either Synthesizer // or Sequencer. return true; } else { // Now the case that deviceClass is Transmitter or // Receiver. If neither allowSynthesizer nor allowSequencer is // true, we require device instances to be // neither Synthesizer nor Sequencer, since we only want // devices representing MIDI ports. // Otherwise, the respective type is accepted, too if ( (! (device instanceof Sequencer) && ! (device instanceof Synthesizer) ) || ((device instanceof Sequencer) && allowSequencer) || ((device instanceof Synthesizer) && allowSynthesizer)) { // And of cource, the device has to be able to provide // Receivers or Transmitters. if ((deviceClass == Receiver.class && device.getMaxReceivers() != 0) || (deviceClass == Transmitter.class && device.getMaxTransmitters() != 0)) { return true; } } } return false;
public static boolean	isFileTypeSupported(int fileType) Indicates whether file writing support for the specified MIDI file type is provided by the system. param fileType the file type for which write capabilities are queried return true if the file type is supported, otherwise false List providers = getMidiFileWriters(); for (int i = 0; i < providers.size(); i++ ) { MidiFileWriter writer = (MidiFileWriter) providers.get(i); if( writer.isFileTypeSupported(fileType)) { return true; } } return false;
public static boolean	isFileTypeSupported(int fileType, javax.sound.midi.Sequence sequence) Indicates whether a MIDI file of the file type specified can be written from the sequence indicated. param fileType the file type for which write capabilities are queried param sequence the sequence for which file writing support is queried return true if the file type is supported for this sequence, otherwise false List providers = getMidiFileWriters(); for (int i = 0; i < providers.size(); i++ ) { MidiFileWriter writer = (MidiFileWriter) providers.get(i); if( writer.isFileTypeSupported(fileType,sequence)) { return true; } } return false;
public static int	write(javax.sound.midi.Sequence in, int fileType, java.io.OutputStream out) Writes a stream of bytes representing a file of the MIDI file type indicated to the output stream provided. param in sequence containing MIDI data to be written to the file param fileType the file type of the file to be written to the output stream param out stream to which the file data should be written return the number of bytes written to the output stream throws IOException if an I/O exception occurs throws IllegalArgumentException if the file format is not supported by the system see #isFileTypeSupported(int, Sequence) see #getMidiFileTypes(Sequence) List providers = getMidiFileWriters(); //$$fb 2002-04-17: Fix for 4635287: Standard MidiFileWriter cannot write empty Sequences int bytesWritten = -2; for (int i = 0; i < providers.size(); i++ ) { MidiFileWriter writer = (MidiFileWriter) providers.get(i); if( writer.isFileTypeSupported( fileType, in ) ) { bytesWritten = writer.write(in, fileType, out); break; } } if (bytesWritten == -2) { throw new IllegalArgumentException("MIDI file type is not supported"); } return bytesWritten;
public static int	write(javax.sound.midi.Sequence in, int type, java.io.File out) Writes a stream of bytes representing a file of the MIDI file type indicated to the external file provided. param in sequence containing MIDI data to be written to the file param type the file type of the file to be written to the output stream param out external file to which the file data should be written return the number of bytes written to the file throws IOException if an I/O exception occurs throws IllegalArgumentException if the file type is not supported by the system see #isFileTypeSupported(int, Sequence) see #getMidiFileTypes(Sequence) List providers = getMidiFileWriters(); //$$fb 2002-04-17: Fix for 4635287: Standard MidiFileWriter cannot write empty Sequences int bytesWritten = -2; for (int i = 0; i < providers.size(); i++ ) { MidiFileWriter writer = (MidiFileWriter) providers.get(i); if( writer.isFileTypeSupported( type, in ) ) { bytesWritten = writer.write(in, type, out); break; } } if (bytesWritten == -2) { throw new IllegalArgumentException("MIDI file type is not supported"); } return bytesWritten;