ios - Method captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection only called a few times -

i'm capturing audio external bluetooth microphone. can't record anything.

this method called 1 time, @ beginning of current avcapturesession.

- (void)captureoutput:(avcaptureoutput *)captureoutput didoutputsamplebuffer:(cmsamplebufferref)samplebuffer fromconnection:(avcaptureconnection *)connection 

after never called method process audio.

for instantiate capture session this:

self.capturesession.usesapplicationaudiosession = true; self.capturesession.automaticallyconfiguresapplicationaudiosession = true; [[avaudiosession sharedinstance] setcategory:avaudiosessioncategoryplayandrecord withoptions:avaudiosessioncategoryoptionallowbluetooth error:nil];   /* audio */ avcapturedevice *audiodevice = [avcapturedevice defaultdevicewithmediatype:avmediatypeaudio];   audioin = [[avcapturedeviceinput alloc] initwithdevice:audiodevice error:nil]; if ( [_capturesession canaddinput:audioin] ) {     [_capturesession addinput:audioin]; } [audioin release];  audioout = [[avcaptureaudiodataoutput alloc] init]; // put audio on own queue ensure our video processing doesn't cause drop audio dispatch_queue_t audiocapturequeue = dispatch_queue_create( "com.apple.sample.capturepipeline.audio", dispatch_queue_serial ); [audioout setsamplebufferdelegate:self queue:audiocapturequeue];  [audiocapturequeue release];  if ( [self.capturesession canaddoutput:audioout] ) {     [self.capturesession addoutput:audioout]; } _audioconnection = [audioout connectionwithmediatype:avmediatypeaudio]; [audioout release]; 

if use bluetooth device working, not one. thought device faulty, working in apps record audio.

is strange problem. knows happening?

thanks!