问题
Folks, I am working on an applet that captures audio from the local computer and streams it up to the server. I am using a Java applet that currently hooks onto the default device and performs the upstream. Things are running well.
I now want to extend the functionality to allow users to choose the audio input device and to also show a sound level indicator of the chosen device in the web page.
I wrote a multithreaded utility that would do AudioSystem.getMixerInfo(); periodically and look for changes. There is also a thread that reads from the chosen device and displays sound levels.
My problem is that when I run my code and plug in a USB headset, the new device is not detected. However, if I shut down my code, then plug in the USB, the device does show up.
Is this a known and documented limitation of JavaSound that it does not sample the device set once the process is running?
I am using OSX Lion.
Thanks for any insights.
-Raj
来源：https://stackoverflow.com/questions/7390942/javasound-detect-device-change