JMF麦克风音量控制器

如何在JMF中获得麦克风音量控制器?

// the device is the media device specifically audio
Processor processorForVolume = Manager.createProcessor(device.getLocator());

// wait until configured
ProcessorStates newState = new ProcessorStateListener(Processor.Configured).waitForProcessorState(processorForVolume);
System.out.println("volumeProcessorState: "+newState);

// setting the content descriptor to null - read in another thread this allows to get the gain control
processorForVolume.setContentDescriptor(null);

// set the track control format to one supported by the device and the track control.
// I didn't match it to an RTP allowed format, but I don't think this has anything to do with it...
TrackControl[] trackControls = processorForVolume.getTrackControls();
if (trackControls.length == 0)
    throw new MC_Exception("No track controls where found for this device:", new Object[]{device});
for (TrackControl control : trackControls)
    trackManipulator.manipulateTrackControls(control);

// wait until the processor is realized
newState = new ProcessorStateListener(Controller.Realized).waitForProcessorState(processorForVolume);
System.out.println("volumeProcessorState: "+newState);

// receives the gain control
micVolumeController = processorForVolume.getGainControl();

// cannot get the output stream to process further... any suggestions?
processor = Manager.createProcessor(processorForVolume.getDataOutput());
new ProcessorStateListener(Processor.Configured).waitForProcessorState(processor);
processor.setContentDescriptor(DeviceCapturingManager.RAW_RTP);
new ProcessorStateListener(Controller.Realized).waitForProcessorState(processor);

这是它生成的输出:

volumeProcessorState:已配置 设置为跟踪控制的格式- com.sun.media。ProcessEngine$ProcTControl@1627c16: 线性,48000.0 Hz,16位,立体声, LittleEndian,签名 volumeProcessorState:已实现

我应该弄清楚,当内容描述符!=null我得到一个输出流,但不是卷控制器,当它为null时,我得到控制器,但没有流。

我尝试连接到音频麦克风设备

亚当。