| /* |
| * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package javax.sound.midi; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.net.URL; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Objects; |
| import java.util.Properties; |
| import java.util.Set; |
| |
| import javax.sound.midi.spi.MidiDeviceProvider; |
| import javax.sound.midi.spi.MidiFileReader; |
| import javax.sound.midi.spi.MidiFileWriter; |
| import javax.sound.midi.spi.SoundbankReader; |
| |
| import com.sun.media.sound.AutoConnectSequencer; |
| import com.sun.media.sound.JDK13Services; |
| import com.sun.media.sound.MidiDeviceReceiverEnvelope; |
| import com.sun.media.sound.MidiDeviceTransmitterEnvelope; |
| import com.sun.media.sound.ReferenceCountingDevice; |
| |
| /** |
| * The {@code MidiSystem} class provides access to the installed MIDI system |
| * resources, including devices such as synthesizers, sequencers, and MIDI input |
| * and output ports. A typical simple MIDI application might begin by invoking |
| * one or more {@code MidiSystem} methods to learn what devices are installed |
| * and to obtain the ones needed in that application. |
| * <p> |
| * The class also has methods for reading files, streams, and URLs that contain |
| * standard MIDI file data or soundbanks. You can query the {@code MidiSystem} |
| * for the format of a specified MIDI file. |
| * <p> |
| * You cannot instantiate a {@code MidiSystem}; all the methods are static. |
| * <p> |
| * Properties can be used to specify default MIDI devices. Both system |
| * properties and a properties file are considered. The "sound.properties" |
| * properties file is read from an implementation-specific location (typically |
| * it is the {@code conf} directory in the Java installation directory). |
| * The optional "javax.sound.config.file" system property can be used to specify |
| * the properties file that will be read as the initial configuration. If a |
| * property exists both as a system property and in the properties file, the |
| * system property takes precedence. If none is specified, a suitable default is |
| * chosen among the available devices. The syntax of the properties file is |
| * specified in {@link Properties#load(InputStream) Properties.load}. The |
| * following table lists the available property keys and which methods consider |
| * them: |
| * |
| * <table class="striped"> |
| * <caption>MIDI System Property Keys</caption> |
| * <thead> |
| * <tr> |
| * <th scope="col">Property Key |
| * <th scope="col">Interface |
| * <th scope="col">Affected Method |
| * </thead> |
| * <tbody> |
| * <tr> |
| * <th scope="row">{@code javax.sound.midi.Receiver} |
| * <td>{@link Receiver} |
| * <td>{@link #getReceiver} |
| * <tr> |
| * <th scope="row">{@code javax.sound.midi.Sequencer} |
| * <td>{@link Sequencer} |
| * <td>{@link #getSequencer} |
| * <tr> |
| * <th scope="row">{@code javax.sound.midi.Synthesizer} |
| * <td>{@link Synthesizer} |
| * <td>{@link #getSynthesizer} |
| * <tr> |
| * <th scope="row">{@code javax.sound.midi.Transmitter} |
| * <td>{@link Transmitter} |
| * <td>{@link #getTransmitter} |
| * </tbody> |
| * </table> |
| * |
| * The property value consists of the provider class name and the device name, |
| * separated by the hash mark ("#"). The provider class name is the |
| * fully-qualified name of a concrete |
| * {@link MidiDeviceProvider MIDI device provider} class. The device name is |
| * matched against the {@code String} returned by the {@code getName} method of |
| * {@code MidiDevice.Info}. Either the class name, or the device name may be |
| * omitted. If only the class name is specified, the trailing hash mark is |
| * optional. |
| * <p> |
| * If the provider class is specified, and it can be successfully retrieved from |
| * the installed providers, the list of {@code MidiDevice.Info} objects is |
| * retrieved from the provider. Otherwise, or when these devices do not provide |
| * a subsequent match, the list is retrieved from {@link #getMidiDeviceInfo} to |
| * contain all available {@code MidiDevice.Info} objects. |
| * <p> |
| * If a device name is specified, the resulting list of {@code MidiDevice.Info} |
| * objects is searched: the first one with a matching name, and whose |
| * {@code MidiDevice} implements the respective interface, will be returned. If |
| * no matching {@code MidiDevice.Info} object is found, or the device name is |
| * not specified, the first suitable device from the resulting list will be |
| * returned. For Sequencer and Synthesizer, a device is suitable if it |
| * implements the respective interface; whereas for Receiver and Transmitter, a |
| * device is suitable if it implements neither Sequencer nor Synthesizer and |
| * provides at least one Receiver or Transmitter, respectively. |
| * <p> |
| * For example, the property {@code javax.sound.midi.Receiver} with a value |
| * {@code "com.sun.media.sound.MidiProvider#SunMIDI1"} will have the following |
| * consequences when {@code getReceiver} is called: if the class |
| * {@code com.sun.media.sound.MidiProvider} exists in the list of installed MIDI |
| * device providers, the first {@code Receiver} device with name |
| * {@code "SunMIDI1"} will be returned. If it cannot be found, the first |
| * {@code Receiver} from that provider will be returned, regardless of name. If |
| * there is none, the first {@code Receiver} with name {@code "SunMIDI1"} in the |
| * list of all devices (as returned by {@code getMidiDeviceInfo}) will be |
| * returned, or, if not found, the first {@code Receiver} that can be found in |
| * the list of all devices is returned. If that fails, too, a |
| * {@code MidiUnavailableException} is thrown. |
| * |
| * @author Kara Kytle |
| * @author Florian Bomers |
| * @author Matthias Pfisterer |
| */ |
| public class MidiSystem { |
| |
| /** |
| * Private no-args constructor for ensuring against instantiation. |
| */ |
| private MidiSystem() { |
| } |
| |
| /** |
| * 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 {@code MidiDevice.Info} objects, one for each |
| * installed MIDI device. If no such devices are installed, an array |
| * of length 0 is returned. |
| */ |
| public static MidiDevice.Info[] getMidiDeviceInfo() { |
| final List<MidiDevice.Info> allInfos = new ArrayList<>(); |
| for (final MidiDeviceProvider provider : getMidiDeviceProviders()) { |
| Collections.addAll(allInfos, provider.getDeviceInfo()); |
| } |
| return allInfos.toArray(new MidiDevice.Info[allInfos.size()]); |
| } |
| |
| /** |
| * 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 |
| * @throws NullPointerException if {@code info} is {@code null} |
| * @see #getMidiDeviceInfo |
| */ |
| public static MidiDevice getMidiDevice(final MidiDevice.Info info) |
| throws MidiUnavailableException { |
| Objects.requireNonNull(info); |
| for (final MidiDeviceProvider provider : getMidiDeviceProviders()) { |
| if (provider.isDeviceSupported(info)) { |
| return provider.getDevice(info); |
| } |
| } |
| throw new IllegalArgumentException(String.format( |
| "Requested device not installed: %s", info)); |
| } |
| |
| /** |
| * Obtains a MIDI receiver from an external MIDI port or other default |
| * device. The returned receiver always implements the |
| * {@code MidiDeviceReceiver} interface. |
| * <p> |
| * If the system property {@code 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}. |
| * <p> |
| * If a suitable MIDI port is not available, the Receiver is retrieved from |
| * an installed synthesizer. |
| * <p> |
| * If a native receiver provided by the default device does not implement |
| * the {@code MidiDeviceReceiver} interface, it will be wrapped in a wrapper |
| * class that implements the {@code MidiDeviceReceiver} interface. The |
| * corresponding {@code Receiver} method calls will be forwarded to the |
| * native receiver. |
| * <p> |
| * If this method returns successfully, the {@link MidiDevice MidiDevice} |
| * the {@code Receiver} belongs to is opened implicitly, if it is not |
| * already open. It is possible to close an implicitly opened device by |
| * calling {@link Receiver#close close} on the returned {@code Receiver}. |
| * All open {@code Receiver} instances have to be closed in order to release |
| * system resources hold by the {@code MidiDevice}. For a detailed |
| * description of open/close behaviour see the class description of |
| * {@link 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 |
| */ |
| public static Receiver getReceiver() throws MidiUnavailableException { |
| // may throw MidiUnavailableException |
| MidiDevice device = getDefaultDeviceWrapper(Receiver.class); |
| Receiver receiver; |
| if (device instanceof ReferenceCountingDevice) { |
| receiver = ((ReferenceCountingDevice) device).getReceiverReferenceCounting(); |
| } else { |
| receiver = device.getReceiver(); |
| } |
| if (!(receiver instanceof MidiDeviceReceiver)) { |
| receiver = new MidiDeviceReceiverEnvelope(device, receiver); |
| } |
| return receiver; |
| } |
| |
| /** |
| * Obtains a MIDI transmitter from an external MIDI port or other default |
| * source. The returned transmitter always implements the |
| * {@code MidiDeviceTransmitter} interface. |
| * <p> |
| * If the system property {@code 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}. |
| * <p> |
| * If a native transmitter provided by the default device does not implement |
| * the {@code MidiDeviceTransmitter} interface, it will be wrapped in a |
| * wrapper class that implements the {@code MidiDeviceTransmitter} |
| * interface. The corresponding {@code Transmitter} method calls will be |
| * forwarded to the native transmitter. |
| * <p> |
| * If this method returns successfully, the {@link MidiDevice MidiDevice} |
| * the {@code Transmitter} belongs to is opened implicitly, if it is not |
| * already open. It is possible to close an implicitly opened device by |
| * calling {@link Transmitter#close close} on the returned |
| * {@code Transmitter}. All open {@code Transmitter} instances have to be |
| * closed in order to release system resources hold by the |
| * {@code MidiDevice}. For a detailed description of open/close behaviour |
| * see the class description of {@link 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 |
| */ |
| public static Transmitter getTransmitter() throws MidiUnavailableException { |
| // may throw MidiUnavailableException |
| MidiDevice device = getDefaultDeviceWrapper(Transmitter.class); |
| Transmitter transmitter; |
| if (device instanceof ReferenceCountingDevice) { |
| transmitter = ((ReferenceCountingDevice) device).getTransmitterReferenceCounting(); |
| } else { |
| transmitter = device.getTransmitter(); |
| } |
| if (!(transmitter instanceof MidiDeviceTransmitter)) { |
| transmitter = new MidiDeviceTransmitterEnvelope(device, transmitter); |
| } |
| return transmitter; |
| } |
| |
| /** |
| * Obtains the default synthesizer. |
| * <p> |
| * If the system property {@code 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 |
| */ |
| public static Synthesizer getSynthesizer() throws MidiUnavailableException { |
| // may throw MidiUnavailableException |
| return (Synthesizer) getDefaultDeviceWrapper(Synthesizer.class); |
| } |
| |
| /** |
| * Obtains the default {@code Sequencer}, connected to a default device. The |
| * returned {@code Sequencer} instance is connected to the default |
| * {@code Synthesizer}, as returned by {@link #getSynthesizer}. If there is |
| * no {@code Synthesizer} available, or the default {@code Synthesizer} |
| * cannot be opened, the {@code sequencer} is connected to the default |
| * {@code Receiver}, as returned by {@link #getReceiver}. The connection is |
| * made by retrieving a {@code Transmitter} instance from the |
| * {@code Sequencer} and setting its {@code Receiver}. Closing and |
| * re-opening the sequencer will restore the connection to the default |
| * device. |
| * <p> |
| * This method is equivalent to calling {@code getSequencer(true)}. |
| * <p> |
| * If the system property {@code 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 {@code Receiver} available |
| * by any installed {@code MidiDevice}, or no sequencer is installed |
| * in the system |
| * @see #getSequencer(boolean) |
| * @see #getSynthesizer |
| * @see #getReceiver |
| */ |
| public static Sequencer getSequencer() throws MidiUnavailableException { |
| return getSequencer(true); |
| } |
| |
| /** |
| * Obtains the default {@code Sequencer}, optionally connected to a default |
| * device. |
| * <p> |
| * If {@code connected} is true, the returned {@code Sequencer} instance is |
| * connected to the default {@code Synthesizer}, as returned by |
| * {@link #getSynthesizer}. If there is no {@code Synthesizer} available, or |
| * the default {@code Synthesizer} cannot be opened, the {@code sequencer} |
| * is connected to the default {@code Receiver}, as returned by |
| * {@link #getReceiver}. The connection is made by retrieving a |
| * {@code Transmitter} instance from the {@code Sequencer} and setting its |
| * {@code Receiver}. Closing and re-opening the sequencer will restore the |
| * connection to the default device. |
| * <p> |
| * If {@code connected} is false, the returned {@code Sequencer} instance is |
| * not connected, it has no open {@code Transmitters}. In order to play the |
| * sequencer on a MIDI device, or a {@code Synthesizer}, it is necessary to |
| * get a {@code Transmitter} and set its {@code Receiver}. |
| * <p> |
| * If the system property {@code 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}. |
| * |
| * @param connected whether or not the returned {@code Sequencer} is |
| * connected to the default {@code Synthesizer} |
| * @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 {@code connected} is true, and there is no |
| * {@code Receiver} available by any installed {@code MidiDevice} |
| * @see #getSynthesizer |
| * @see #getReceiver |
| * @since 1.5 |
| */ |
| public static Sequencer getSequencer(boolean connected) |
| throws MidiUnavailableException { |
| 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(); |
| } 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 = 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; |
| } |
| |
| /** |
| * 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 {@code 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 |
| * @throws NullPointerException if {@code stream} is {@code null} |
| * @see InputStream#markSupported |
| * @see InputStream#mark |
| */ |
| public static Soundbank getSoundbank(final InputStream stream) |
| throws InvalidMidiDataException, IOException { |
| Objects.requireNonNull(stream); |
| |
| SoundbankReader sp = null; |
| Soundbank s = null; |
| |
| List<SoundbankReader> providers = getSoundbankReaders(); |
| |
| for(int i = 0; i < providers.size(); i++) { |
| sp = providers.get(i); |
| s = sp.getSoundbank(stream); |
| |
| if( s!= null) { |
| return s; |
| } |
| } |
| throw new InvalidMidiDataException("cannot get soundbank from stream"); |
| |
| } |
| |
| /** |
| * Constructs a {@code 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 |
| * @throws NullPointerException if {@code url} is {@code null} |
| */ |
| public static Soundbank getSoundbank(final URL url) |
| throws InvalidMidiDataException, IOException { |
| Objects.requireNonNull(url); |
| |
| SoundbankReader sp = null; |
| Soundbank s = null; |
| |
| List<SoundbankReader> providers = getSoundbankReaders(); |
| |
| for(int i = 0; i < providers.size(); i++) { |
| sp = providers.get(i); |
| s = sp.getSoundbank(url); |
| |
| if( s!= null) { |
| return s; |
| } |
| } |
| throw new InvalidMidiDataException("cannot get soundbank from stream"); |
| |
| } |
| |
| /** |
| * Constructs a {@code Soundbank} by reading it from the specified |
| * {@code File}. The {@code 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 {@code 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 |
| * @throws NullPointerException if {@code file} is {@code null} |
| */ |
| public static Soundbank getSoundbank(final File file) |
| throws InvalidMidiDataException, IOException { |
| Objects.requireNonNull(file); |
| |
| SoundbankReader sp = null; |
| Soundbank s = null; |
| |
| List<SoundbankReader> providers = getSoundbankReaders(); |
| |
| for(int i = 0; i < providers.size(); i++) { |
| sp = providers.get(i); |
| s = sp.getSoundbank(file); |
| |
| if( s!= null) { |
| return s; |
| } |
| } |
| throw new InvalidMidiDataException("cannot get soundbank from 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. |
| * <p> |
| * 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 |
| * {@code IOException}. |
| * <p> |
| * This operation can only succeed for files of a type which can be parsed |
| * by an installed file reader. It may fail with an |
| * {@code InvalidMidiDataException} even for valid files if no compatible |
| * file reader is installed. It will also fail with an |
| * {@code 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 {@code 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 |
| * @throws NullPointerException if {@code stream} is {@code null} |
| * @see #getMidiFileFormat(URL) |
| * @see #getMidiFileFormat(File) |
| * @see InputStream#markSupported |
| * @see InputStream#mark |
| */ |
| public static MidiFileFormat getMidiFileFormat(final InputStream stream) |
| throws InvalidMidiDataException, IOException { |
| Objects.requireNonNull(stream); |
| |
| List<MidiFileReader> providers = getMidiFileReaders(); |
| MidiFileFormat format = null; |
| |
| for(int i = 0; i < providers.size(); i++) { |
| MidiFileReader reader = 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; |
| } |
| } |
| |
| /** |
| * 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. |
| * <p> |
| * This operation can only succeed for files of a type which can be parsed |
| * by an installed file reader. It may fail with an |
| * {@code InvalidMidiDataException} even for valid files if no compatible |
| * file reader is installed. It will also fail with an |
| * {@code 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 {@code 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 |
| * @throws NullPointerException if {@code url} is {@code null} |
| * @see #getMidiFileFormat(InputStream) |
| * @see #getMidiFileFormat(File) |
| */ |
| public static MidiFileFormat getMidiFileFormat(final URL url) |
| throws InvalidMidiDataException, IOException { |
| Objects.requireNonNull(url); |
| |
| List<MidiFileReader> providers = getMidiFileReaders(); |
| MidiFileFormat format = null; |
| |
| for(int i = 0; i < providers.size(); i++) { |
| MidiFileReader reader = 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; |
| } |
| } |
| |
| /** |
| * Obtains the MIDI file format of the specified {@code File}. The |
| * {@code File} must point to valid MIDI file data for a file type |
| * recognized by the system. |
| * <p> |
| * This operation can only succeed for files of a type which can be parsed |
| * by an installed file reader. It may fail with an |
| * {@code InvalidMidiDataException} even for valid files if no compatible |
| * file reader is installed. It will also fail with an |
| * {@code InvalidMidiDataException} if a compatible file reader is |
| * installed, but encounters errors while determining the file format. |
| * |
| * @param file the {@code File} from which file format information should |
| * be extracted |
| * @return a {@code MidiFileFormat} object describing the MIDI file format |
| * @throws InvalidMidiDataException if the {@code 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 |
| * @throws NullPointerException if {@code file} is {@code null} |
| * @see #getMidiFileFormat(InputStream) |
| * @see #getMidiFileFormat(URL) |
| */ |
| public static MidiFileFormat getMidiFileFormat(final File file) |
| throws InvalidMidiDataException, IOException { |
| Objects.requireNonNull(file); |
| |
| List<MidiFileReader> providers = getMidiFileReaders(); |
| MidiFileFormat format = null; |
| |
| for(int i = 0; i < providers.size(); i++) { |
| MidiFileReader reader = 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; |
| } |
| } |
| |
| /** |
| * 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. |
| * <p> |
| * 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 |
| * {@code IOException}. |
| * <p> |
| * This operation can only succeed for files of a type which can be parsed |
| * by an installed file reader. It may fail with an |
| * {@code InvalidMidiDataException} even for valid files if no compatible |
| * file reader is installed. It will also fail with an |
| * {@code InvalidMidiDataException} if a compatible file reader is |
| * installed, but encounters errors while constructing the {@code Sequence} |
| * object from the file data. |
| * |
| * @param stream the input stream from which the {@code Sequence} should be |
| * constructed |
| * @return a {@code 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 |
| * @throws NullPointerException if {@code stream} is {@code null} |
| * @see InputStream#markSupported |
| * @see InputStream#mark |
| */ |
| public static Sequence getSequence(final InputStream stream) |
| throws InvalidMidiDataException, IOException { |
| Objects.requireNonNull(stream); |
| |
| List<MidiFileReader> providers = getMidiFileReaders(); |
| Sequence sequence = null; |
| |
| for(int i = 0; i < providers.size(); i++) { |
| MidiFileReader reader = 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; |
| } |
| } |
| |
| /** |
| * 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. |
| * <p> |
| * This operation can only succeed for files of a type which can be parsed |
| * by an installed file reader. It may fail with an |
| * {@code InvalidMidiDataException} even for valid files if no compatible |
| * file reader is installed. It will also fail with an |
| * {@code InvalidMidiDataException} if a compatible file reader is |
| * installed, but encounters errors while constructing the {@code Sequence} |
| * object from the file data. |
| * |
| * @param url the URL from which the {@code Sequence} should be constructed |
| * @return a {@code 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 |
| * @throws NullPointerException if {@code url} is {@code null} |
| */ |
| public static Sequence getSequence(final URL url) |
| throws InvalidMidiDataException, IOException { |
| Objects.requireNonNull(url); |
| |
| List<MidiFileReader> providers = getMidiFileReaders(); |
| Sequence sequence = null; |
| |
| for(int i = 0; i < providers.size(); i++) { |
| MidiFileReader reader = 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; |
| } |
| } |
| |
| /** |
| * Obtains a MIDI sequence from the specified {@code File}. The {@code File} |
| * must point to valid MIDI file data for a file type recognized by the |
| * system. |
| * <p> |
| * This operation can only succeed for files of a type which can be parsed |
| * by an installed file reader. It may fail with an |
| * {@code InvalidMidiDataException} even for valid files if no compatible |
| * file reader is installed. It will also fail with an |
| * {@code InvalidMidiDataException} if a compatible file reader is |
| * installed, but encounters errors while constructing the {@code Sequence} |
| * object from the file data. |
| * |
| * @param file the {@code File} from which the {@code Sequence} should be |
| * constructed |
| * @return a {@code 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 |
| * @throws NullPointerException if {@code file} is {@code null} |
| */ |
| public static Sequence getSequence(final File file) |
| throws InvalidMidiDataException, IOException { |
| Objects.requireNonNull(file); |
| |
| List<MidiFileReader> providers = getMidiFileReaders(); |
| Sequence sequence = null; |
| |
| for(int i = 0; i < providers.size(); i++) { |
| MidiFileReader reader = 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; |
| } |
| } |
| |
| /** |
| * 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. |
| */ |
| public static int[] getMidiFileTypes() { |
| |
| List<MidiFileWriter> providers = getMidiFileWriters(); |
| Set<Integer> allTypes = new HashSet<>(); |
| |
| // gather from all the providers |
| |
| for (int i = 0; i < providers.size(); i++ ) { |
| MidiFileWriter writer = providers.get(i); |
| int[] types = writer.getMidiFileTypes(); |
| for (int j = 0; j < types.length; j++ ) { |
| allTypes.add(types[j]); |
| } |
| } |
| int resultTypes[] = new int[allTypes.size()]; |
| int index = 0; |
| Iterator<Integer> iterator = allTypes.iterator(); |
| while (iterator.hasNext()) { |
| Integer integer = iterator.next(); |
| resultTypes[index++] = integer.intValue(); |
| } |
| return resultTypes; |
| } |
| |
| /** |
| * 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 {@code true} if the file type is supported, otherwise |
| * {@code false} |
| */ |
| public static boolean isFileTypeSupported(int fileType) { |
| |
| List<MidiFileWriter> providers = getMidiFileWriters(); |
| |
| for (int i = 0; i < providers.size(); i++ ) { |
| MidiFileWriter writer = providers.get(i); |
| if( writer.isFileTypeSupported(fileType)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * 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. |
| * @throws NullPointerException if {@code sequence} is {@code null} |
| */ |
| public static int[] getMidiFileTypes(final Sequence sequence) { |
| Objects.requireNonNull(sequence); |
| |
| List<MidiFileWriter> providers = getMidiFileWriters(); |
| Set<Integer> allTypes = new HashSet<>(); |
| |
| // gather from all the providers |
| |
| for (int i = 0; i < providers.size(); i++ ) { |
| MidiFileWriter writer = providers.get(i); |
| int[] types = writer.getMidiFileTypes(sequence); |
| for (int j = 0; j < types.length; j++ ) { |
| allTypes.add(types[j]); |
| } |
| } |
| int resultTypes[] = new int[allTypes.size()]; |
| int index = 0; |
| Iterator<Integer> iterator = allTypes.iterator(); |
| while (iterator.hasNext()) { |
| Integer integer = iterator.next(); |
| resultTypes[index++] = integer.intValue(); |
| } |
| return resultTypes; |
| } |
| |
| /** |
| * 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 {@code true} if the file type is supported for this sequence, |
| * otherwise {@code false} |
| * @throws NullPointerException if {@code sequence} is {@code null} |
| */ |
| public static boolean isFileTypeSupported(final int fileType, |
| final Sequence sequence) { |
| Objects.requireNonNull(sequence); |
| |
| List<MidiFileWriter> providers = getMidiFileWriters(); |
| |
| for (int i = 0; i < providers.size(); i++ ) { |
| MidiFileWriter writer = providers.get(i); |
| if( writer.isFileTypeSupported(fileType,sequence)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * 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 |
| * @throws NullPointerException if {@code in} or {@code out} are |
| * {@code null} |
| * @see #isFileTypeSupported(int, Sequence) |
| * @see #getMidiFileTypes(Sequence) |
| */ |
| public static int write(final Sequence in, final int fileType, |
| final OutputStream out) throws IOException { |
| Objects.requireNonNull(in); |
| Objects.requireNonNull(out); |
| |
| List<MidiFileWriter> providers = getMidiFileWriters(); |
| //$$fb 2002-04-17: Fix for 4635287: Standard MidiFileWriter cannot write empty Sequences |
| int bytesWritten = -2; |
| |
| for (int i = 0; i < providers.size(); i++ ) { |
| MidiFileWriter writer = providers.get(i); |
| if( writer.isFileTypeSupported( fileType, in ) ) { |
| |
| bytesWritten = writer.write(in, fileType, out); |
| break; |
| } |
| } |
| if (bytesWritten == -2) { |
| throw new IllegalArgumentException("MIDI file type is not supported"); |
| } |
| return bytesWritten; |
| } |
| |
| /** |
| * Writes a stream of bytes representing a file of the MIDI file type |
| * indicated to the external file provided. |
| * |
| * @param in sequence containing MIDI data to be written to the file |
| * @param type the file type of the file to be written to the output stream |
| * @param out external file to which the file data should be written |
| * @return the number of bytes written to the file |
| * @throws IOException if an I/O exception occurs |
| * @throws IllegalArgumentException if the file type is not supported by the |
| * system |
| * @throws NullPointerException if {@code in} or {@code out} are |
| * {@code null} |
| * @see #isFileTypeSupported(int, Sequence) |
| * @see #getMidiFileTypes(Sequence) |
| */ |
| public static int write(final Sequence in, final int type, final File out) |
| throws IOException { |
| Objects.requireNonNull(in); |
| Objects.requireNonNull(out); |
| |
| List<MidiFileWriter> providers = getMidiFileWriters(); |
| //$$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 = 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; |
| } |
| |
| // HELPER METHODS |
| |
| /** |
| * Obtains the list of MidiDeviceProviders installed on the system. |
| * |
| * @return the list of MidiDeviceProviders installed on the system |
| */ |
| @SuppressWarnings("unchecked") |
| private static List<MidiDeviceProvider> getMidiDeviceProviders() { |
| return (List<MidiDeviceProvider>) getProviders(MidiDeviceProvider.class); |
| } |
| |
| /** |
| * Obtains the list of SoundbankReaders installed on the system. |
| * |
| * @return the list of SoundbankReaders installed on the system |
| */ |
| @SuppressWarnings("unchecked") |
| private static List<SoundbankReader> getSoundbankReaders() { |
| return (List<SoundbankReader>) getProviders(SoundbankReader.class); |
| } |
| |
| /** |
| * Obtains the list of MidiFileWriters installed on the system. |
| * |
| * @return the list of MidiFileWriters installed on the system |
| */ |
| @SuppressWarnings("unchecked") |
| private static List<MidiFileWriter> getMidiFileWriters() { |
| return (List<MidiFileWriter>) getProviders(MidiFileWriter.class); |
| } |
| |
| /** |
| * Obtains the list of MidiFileReaders installed on the system. |
| * |
| * @return the list of MidiFileReaders installed on the system |
| */ |
| @SuppressWarnings("unchecked") |
| private static List<MidiFileReader> getMidiFileReaders() { |
| return (List<MidiFileReader>) getProviders(MidiFileReader.class); |
| } |
| |
| /** |
| * Attempts to locate and return a default MidiDevice of the specified type. |
| * This method wraps {@link #getDefaultDevice}. It catches the |
| * {@code IllegalArgumentException} thrown by {@code getDefaultDevice} and |
| * instead throws a {@code MidiUnavailableException}, with the catched |
| * exception chained. |
| * |
| * @param deviceClass The requested device type, one of Synthesizer.class, |
| * Sequencer.class, Receiver.class or Transmitter.class |
| * @return default MidiDevice of the specified type |
| * @throws MidiUnavailableException on failure |
| */ |
| private static MidiDevice getDefaultDeviceWrapper(Class<?> deviceClass) |
| throws MidiUnavailableException{ |
| try { |
| return getDefaultDevice(deviceClass); |
| } catch (IllegalArgumentException iae) { |
| MidiUnavailableException mae = new MidiUnavailableException(); |
| mae.initCause(iae); |
| throw mae; |
| } |
| } |
| |
| /** |
| * 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 |
| * @return default MidiDevice of the specified type. |
| * @throws IllegalArgumentException on failure |
| */ |
| private static MidiDevice getDefaultDevice(Class<?> deviceClass) { |
| List<MidiDeviceProvider> 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 defaults 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"); |
| } |
| |
| /** |
| * Return a MidiDeviceProvider of a given class from the list of |
| * MidiDeviceProviders. |
| * |
| * @param providerClassName The class name of the provider to be returned |
| * @param providers The list of MidiDeviceProviders that is searched |
| * @return A MidiDeviceProvider of the requested class, or null if none is |
| * found |
| */ |
| private static MidiDeviceProvider getNamedProvider(String providerClassName, |
| List<MidiDeviceProvider> providers) { |
| for(int i = 0; i < providers.size(); i++) { |
| MidiDeviceProvider provider = providers.get(i); |
| if (provider.getClass().getName().equals(providerClassName)) { |
| return provider; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * 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 |
| */ |
| private static MidiDevice getNamedDevice(String deviceName, |
| MidiDeviceProvider provider, |
| Class<?> deviceClass) { |
| 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; |
| } |
| |
| /** |
| * 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 |
| * @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 A MidiDevice matching the requirements, or null if none is found |
| */ |
| private static MidiDevice getNamedDevice(String deviceName, |
| MidiDeviceProvider provider, |
| Class<?> deviceClass, |
| boolean allowSynthesizer, |
| boolean allowSequencer) { |
| 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; |
| } |
| |
| /** |
| * 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 |
| */ |
| private static MidiDevice getNamedDevice(String deviceName, |
| List<MidiDeviceProvider> providers, |
| Class<?> deviceClass) { |
| 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; |
| } |
| |
| /** |
| * 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 |
| * @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 A Mixer matching the requirements, or null if none is found |
| */ |
| private static MidiDevice getNamedDevice(String deviceName, |
| List<MidiDeviceProvider> providers, |
| Class<?> deviceClass, |
| boolean allowSynthesizer, |
| boolean allowSequencer) { |
| for(int i = 0; i < providers.size(); i++) { |
| MidiDeviceProvider provider = providers.get(i); |
| MidiDevice device = getNamedDevice(deviceName, provider, |
| deviceClass, |
| allowSynthesizer, |
| allowSequencer); |
| if (device != null) { |
| return device; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * 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 |
| */ |
| private static MidiDevice getFirstDevice(MidiDeviceProvider provider, |
| Class<?> deviceClass) { |
| 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; |
| } |
| |
| /** |
| * 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 |
| * @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 A MidiDevice is considered appropriate, or null if no appropriate |
| * device is found |
| */ |
| private static MidiDevice getFirstDevice(MidiDeviceProvider provider, |
| Class<?> deviceClass, |
| boolean allowSynthesizer, |
| boolean allowSequencer) { |
| 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; |
| } |
| |
| /** |
| * 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 |
| */ |
| private static MidiDevice getFirstDevice(List<MidiDeviceProvider> providers, |
| Class<?> deviceClass) { |
| 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; |
| } |
| |
| /** |
| * 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 |
| * @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 A MidiDevice that is considered appropriate, or null if none is |
| * found |
| */ |
| private static MidiDevice getFirstDevice(List<MidiDeviceProvider> providers, |
| Class<?> deviceClass, |
| boolean allowSynthesizer, |
| boolean allowSequencer) { |
| for(int i = 0; i < providers.size(); i++) { |
| MidiDeviceProvider provider = providers.get(i); |
| MidiDevice device = getFirstDevice(provider, deviceClass, |
| allowSynthesizer, |
| allowSequencer); |
| if (device != null) { |
| return device; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * 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 deviceClass The requested device type, one of Synthesizer.class, |
| * Sequencer.class, Receiver.class or Transmitter.class |
| * @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 |
| */ |
| private static boolean isAppropriateDevice(MidiDevice device, |
| Class<?> deviceClass, |
| boolean allowSynthesizer, |
| boolean allowSequencer) { |
| 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; |
| } |
| |
| /** |
| * Obtains the set of services currently installed on the system using the |
| * SPI mechanism in 1.3. |
| * |
| * @param providerClass The type of providers requested. This should be one |
| * of AudioFileReader.class, AudioFileWriter.class, |
| * FormatConversionProvider.class, MixerProvider.class, |
| * MidiDeviceProvider.class, MidiFileReader.class, |
| * MidiFileWriter.class or SoundbankReader.class. |
| * @return a List of instances of providers for the requested service. If no |
| * providers are available, a List of length 0 will be returned. |
| */ |
| private static List<?> getProviders(Class<?> providerClass) { |
| return JDK13Services.getProviders(providerClass); |
| } |
| } |
