Microphone.java 文件源码

/**
 * Constructs a Microphone with the given InputStream.
 */
@Override
public void initialize() {
    super.initialize();
    audioList = new LinkedBlockingQueue<Data>();

    DataLine.Info info = new DataLine.Info(TargetDataLine.class, desiredFormat);

    /*
     * If we cannot get an audio line that matches the desired
     * characteristics, shoot for one that matches almost everything we
     * want, but has a higher sample rate.
     */
    if (!AudioSystem.isLineSupported(info)) {
        logger.info(desiredFormat + " not supported");
        AudioFormat nativeFormat = DataUtil.getNativeAudioFormat(desiredFormat, getSelectedMixer());
        if (nativeFormat == null) {
            logger.severe("couldn't find suitable target audio format");
        } else {
            finalFormat = nativeFormat;

            /* convert from native to the desired format if supported */
            doConversion = AudioSystem.isConversionSupported(desiredFormat, nativeFormat);

            if (doConversion) {
                logger.info("Converting from " + finalFormat.getSampleRate() + "Hz to "
                        + desiredFormat.getSampleRate() + "Hz");
            } else {
                logger.info("Using native format: Cannot convert from " + finalFormat.getSampleRate() + "Hz to "
                        + desiredFormat.getSampleRate() + "Hz");
            }
        }
    } else {
        logger.info("Desired format: " + desiredFormat + " supported.");
        finalFormat = desiredFormat;
    }
}