Examples of javax.sound.sampled.spi.FormatConversionProvider

javax.sound.sampled.spi.FormatConversionProvider
A format conversion provider provides format conversion services from one or more input formats to one or more output formats. Converters include codecs, which encode and/or decode audio data, as well as transcoders, etc. Format converters provide methods for determining what conversions are supported and for obtaining an audio stream from which converted data can be read.
The source format represents the format of the incoming audio data, which will be converted.
The target format represents the format of the processed, converted audio data. This is the format of the data that can be read from the stream returned by one of the getAudioInputStream methods. @author Kara Kytle @since 1.3

     * of at least 1, representing the encoding of <code>sourceFormat</code> (no conversion).
     */
    public static AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat) {




        FormatConversionProvider codecs[] = getFormatConversionProviders();
        Vector encodings = new Vector();


        int size = 0;
        int index = 0;
        AudioFormat.Encoding encs[] = null;

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     * otherwise <code>false</code>
     */
    public static boolean isConversionSupported(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat) {




        FormatConversionProvider codecs[] = getFormatConversionProviders();


        for(int i=0; i<codecs.length; i++ ) {
            if(codecs[i].isConversionSupported(targetEncoding,sourceFormat) ) {
                return true;
            }

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     * @see #getAudioInputStream(AudioFormat, AudioInputStream)
     */
    public static AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding,
                                                       AudioInputStream sourceStream) {


        FormatConversionProvider codecs[] = getFormatConversionProviders();


        //$$fb 2001-08-03: reverse this loop to give external providers more priority (Bug #4487550)
        for(int i = codecs.length-1; i >= 0; i-- ) {
            if( codecs[i].isConversionSupported( targetEncoding, sourceStream.getFormat() ) ) {
                return codecs[i].getAudioInputStream( targetEncoding, sourceStream );

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     * @return array of formats.  If no formats of the specified
     * encoding are supported, an array of length 0 is returned.
     */
    public static AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat) {


        FormatConversionProvider codecs[] = getFormatConversionProviders();
        Vector formats = new Vector();


        int size = 0;
        int index = 0;
        AudioFormat fmts[] = null;

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     * otherwise <code>false</code>
     */


    public static boolean isConversionSupported(AudioFormat targetFormat, AudioFormat sourceFormat) {


        FormatConversionProvider codecs[] = getFormatConversionProviders();


        for(int i=0; i<codecs.length; i++ ) {
            if(codecs[i].isConversionSupported(targetFormat, sourceFormat) ) {
                return true;
            }

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        if (sourceStream.getFormat().matches(targetFormat)) {
            return sourceStream;
        }


        FormatConversionProvider codecs[] = getFormatConversionProviders();


        //$$fb 2001-08-03: reverse this loop to give external providers more priority (Bug #4487550)
        for(int i = codecs.length-1; i >= 0; i-- ) {


            if(codecs[i].isConversionSupported(targetFormat,sourceStream.getFormat()) ) {

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     * returned.
     */
    private static FormatConversionProvider[] getFormatConversionProviders() {


        Vector v = new Vector();
        FormatConversionProvider varray[];


        try {


            Class.forName( "sun.misc.Service" );

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  {
    HashSet result = new HashSet();
    Iterator i = ServiceFactory.lookupProviders(FormatConversionProvider.class);
    while (i.hasNext())
      {
        FormatConversionProvider prov = (FormatConversionProvider) i.next();
        if (! prov.isConversionSupported(targ, ais.getFormat()))
          continue;
        return prov.getAudioInputStream(targ, ais);
      }
    throw new IllegalArgumentException("encoding not supported for stream");
 }

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  {
    HashSet result = new HashSet();
    Iterator i = ServiceFactory.lookupProviders(FormatConversionProvider.class);
    while (i.hasNext())
      {
        FormatConversionProvider prov = (FormatConversionProvider) i.next();
        if (! prov.isConversionSupported(targ, ais.getFormat()))
          continue;
        return prov.getAudioInputStream(targ, ais);
      }
    throw new IllegalArgumentException("format not supported for stream");
   }

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  {
    HashSet result = new HashSet();
    Iterator i = ServiceFactory.lookupProviders(FormatConversionProvider.class);
    while (i.hasNext())
      {
        FormatConversionProvider prov = (FormatConversionProvider) i.next();
        if (! prov.isSourceEncodingSupported(source))
          continue;
        AudioFormat.Encoding[] es = prov.getTargetEncodings();
        for (int j = 0; j < es.length; ++j)
          result.add(es[j]);
      }
    return (AudioFormat.Encoding[]) result.toArray(new AudioFormat.Encoding[result.size()]);
  }

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