GetSampleAsync does not fire in MediaStreamSource on WP7 device

I've been developing an audio app for Windows Phone 7 and up to this point have been using the WP7 emulator. The app uses a custom MediaStreamSource class to stream audio to a MediaElement.

On a real device, the custom MediaStreamSource completely fails. Afte开发者_开发知识库r calling MediaElement.Play(), the MediaStreamSource's GetSampleAsync method never gets called. It works just fine in the emulator.

I've started the app in the debugger (running on the device) and no exceptions get thrown anywhere.

I'm wondering if maybe my stream source is using a sample rate, bits per sample, or channel count that is not supported? I cannot find any documentation on what values are supported - however I find it hard to believe that my settings are not supported (44,100 Hz, 16 bits/sample, 2 channels).

Thoughts?

---

The answer is that the Zune software interferes with the phone's media capabilities. The app will work on the device if you disconnect the device from the computer, or by using the WPConnect tool: http://blogs.msdn.com/b/jaimer/archive/2010/11/03/tips-for-debugging-wp7-media-apps-with-wpconnect.aspx