如何在 JMF 中获取麦克风音量控制器？
这就是我所拥有的：
我尝试了你的这个实现概念，但是当我尝试获取流时，我一直从第一个卷处理器得到一个空值，我是这样做的：
// 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：配置格式设置为跟踪控制 - com.sun.media.ProcessEngine$ProcTControl@1627c16：LINEAR，48000.0 Hz，16 位，立体声，LittleEndian，签名 volumeProcessorState：已实现
处理器输出的数据为Null。
我应该明确一点，当内容描述符 != null 我得到一个输出流但没有音量控制器，当它为空时我得到控制器，但没有流。
我尝试连接到音频麦克风设备
亚当。