Toolkit.java 文件源码

public static AudioInputStream getPCMConvertedAudioInputStream(AudioInputStream ais) {
    // we can't open the device for non-PCM playback, so we have
    // convert any other encodings to PCM here (at least we try!)
    AudioFormat af = ais.getFormat();

    if( (!af.getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)) &&
        (!af.getEncoding().equals(AudioFormat.Encoding.PCM_UNSIGNED))) {

        try {
            AudioFormat newFormat =
                new AudioFormat( AudioFormat.Encoding.PCM_SIGNED,
                                 af.getSampleRate(),
                                 16,
                                 af.getChannels(),
                                 af.getChannels() * 2,
                                 af.getSampleRate(),
                                 Platform.isBigEndian());
            ais = AudioSystem.getAudioInputStream(newFormat, ais);
        } catch (Exception e) {
            if (Printer.err) e.printStackTrace();
            ais = null;
        }
    }

    return ais;
}