Java MidiFileWriter类代码示例

import javax.sound.midi.spi.MidiFileWriter; //导入依赖的package包/类
/**
 * Obtains a List containing installed instances of the providers for the
 * requested service. The returned List is immutable.
 *
 * @param serviceClass 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 providers of the requested type. This List is
 *         immutable.
 */
public static List<?> getProviders(final Class<?> serviceClass) {
    final List<?> providers;
    if (!MixerProvider.class.equals(serviceClass)
            && !FormatConversionProvider.class.equals(serviceClass)
            && !AudioFileReader.class.equals(serviceClass)
            && !AudioFileWriter.class.equals(serviceClass)
            && !MidiDeviceProvider.class.equals(serviceClass)
            && !SoundbankReader.class.equals(serviceClass)
            && !MidiFileWriter.class.equals(serviceClass)
            && !MidiFileReader.class.equals(serviceClass)) {
        providers = new ArrayList<>(0);
    } else {
        providers = JSSecurityManager.getProviders(serviceClass);
    }
    return Collections.unmodifiableList(providers);
}
 

import javax.sound.midi.spi.MidiFileWriter; //导入依赖的package包/类
/**
 * 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 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;
}
 

import javax.sound.midi.spi.MidiFileWriter; //导入依赖的package包/类
/**
 * 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)
 */
public static int write(Sequence in, int fileType, OutputStream out) throws IOException {

    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;
}
 

import javax.sound.midi.spi.MidiFileWriter; //导入依赖的package包/类
/**
 * 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;
}
 

import javax.sound.midi.spi.MidiFileWriter; //导入依赖的package包/类
/**
 * 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;
}