Can the audio stream output from the earpiece during a call be captured?

I am looking to develop an application and would like to know if the earpiece audio output can be c开发者_JAVA技巧aptured.

Thanks, Matt

Looking at the documentation for MediaRecorder.AudioSource I would say that this should be possible using the VOICE_DOWNLINK source.

MediaRecorder recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_DOWNLINK);