使用Java在Mac上进行麦克风声级控制

Question

我想使用java在OSX上控制麦克风的声音水平，我在下面的源代码中使用过，但在Mac OS上不支持。 有什么方法可以使用Java控制OSX上的麦克风音量吗？

public static void setDeviceSensitivity(final int sensitivity) {
    final Port lineIn;
    //  Mixer.Info[] mixerInfoPool=AudioSystem.getMixerInfo();

    final Mixer mixer = AudioSystem.getMixer(null);
    try {
        if (mixer.isLineSupported(Port.Info.LINE_IN)) {
            lineIn = (Port) mixer.getLine(Port.Info.LINE_IN);
            lineIn.open();
        } else if (mixer.isLineSupported(Port.Info.MICROPHONE)) {
            lineIn = (Port) mixer.getLine(Port.Info.MICROPHONE);
            lineIn.open();
        } else if (mixer.isLineSupported(Port.Info.HEADPHONE)) {
            lineIn = (Port) mixer.getLine(Port.Info.HEADPHONE);
            lineIn.open();
        } else {
            System.out.println("Unable to get Input Port");
            return;
        }
        lineIn.getControls();

        if (lineIn.isControlSupported(FloatControl.Type.MASTER_GAIN)) {
            System.out.println("kewl");
        }

        final CompoundControl cc = (CompoundControl) lineIn.getControls()[0];
        final Control[] controls = cc.getMemberControls();
        for (final Control c : controls) {
            if (c instanceof FloatControl) {
                System.out.println("BEFORE LINE_IN VOL = "
                        + ((FloatControl) c).getValue());
                ((FloatControl) c).setValue((float) sensitivity / 100);
                System.out.println("AFTER LINE_IN VOL = "
                        + ((FloatControl) c).getValue());
            }
        }
    } catch (final Exception e) {
        System.out.println(e);
    }
   }

Answer 1

获取麦克风：

    Mixer.Info microphone = null;
    for (Mixer.Info info : AudioSystem.getMixerInfo()) {
        System.out.println(info);
        if (info.getName().equals("Port Built-in Microphone")) {
            System.out.println("found " + info);
            microphone = info;
        }            
    }

    final Mixer mixer = AudioSystem.getMixer(microphone);