[Linphone-developers] detect silence

[Cynthia He]

We are writing an application that will record audio for all calls.  Since most 
of the time, users are just listening in for announcement of events, we need to 
be able to only record when someone is talking and stop recording when nobody 
is talking.

I know that I can get play volumes and if it is below certain level, it may be 
considered as silence.  The problem is how to detect volume has changed enough 
to start or stop recording.  I didn’t find a callback for that purpose.  Or do 
we just have to run a thread that checks for volume continuously (obviously not 
very efficient)?

I appreciate any help!

CynHe