I use openal to record and use openal to play ; use QT demo to do the communication. When I put on the Bluetooth headset, as long as I turn on the audio record by BT, the audio playback will be blocked, unable to consume data. And the trumpet  is black-color at this time; But when the trumpet is gray, the record will not block the playback,i can play and record . It's a random event。 I wonder if there is a program that can detect or change this blocking?

I use kNewTimePitchParampitch ; audiounit (in)---convert(pitch shift)---audiounit( out);I can get the result about pitch shift status =AudioUnitSetParameter(convert, kNewTimePitchParamPitch, kAudioUnitScopeGlobal, 0, pitchShift, 0); change param:AudioUnitSetParameter(conver, kNewTimePitchParamRate  , kAudioUnitScope_Global, 0, pitchShift, 0); the AudioUnitAddRenderNotify can not get the data which have been change speech. the data is 00. so how to use the rate change?