DirectAudioDeviceProvider.java 文件源码

@Override
public Mixer getMixer(Mixer.Info info) {
    synchronized (DirectAudioDeviceProvider.class) {
        // if the default device is asked, we provide the mixer
        // with SourceDataLine's
        if (info == null) {
            for (int i = 0; i < infos.length; i++) {
                Mixer mixer = getDevice(infos[i]);
                if (mixer.getSourceLineInfo().length > 0) {
                    return mixer;
                }
            }
        }
        // otherwise get the first mixer that matches
        // the requested info object
        for (int i = 0; i < infos.length; i++) {
            if (infos[i].equals(info)) {
                return getDevice(infos[i]);
            }
        }
    }
    throw new IllegalArgumentException(
            String.format("Mixer %s not supported by this provider", info));
}