iphone - AVCapture Session and detecting blow from mic -

i trying record video avcapture session , same time detecting blow facing problem when click record button camera freezes., 1 importent thing when remove audio input avcapture session every thing working fine..how should handle this. should appreciable..

code recording button follows

 [recordbutton setenabled:no]; nsurl *url = [nsurl fileurlwithpath:@"/dev/null"];  nsdictionary *settings = [nsdictionary dictionarywithobjectsandkeys:                           [nsnumber numberwithfloat: 44100.0],                 avsampleratekey,                           [nsnumber numberwithint: kaudioformatapplelossless], avformatidkey,                           [nsnumber numberwithint: 1],                         avnumberofchannelskey,                           [nsnumber numberwithint: avaudioqualitymax],         avencoderaudioqualitykey,                           nil];  nserror *error;  recorder = [[avaudiorecorder alloc] initwithurl:url settings:settings error:&error];  if (recorder) {     [recorder preparetorecord];     recorder.meteringenabled = yes;     [recorder record];     leveltimer = [nstimer scheduledtimerwithtimeinterval: 0.03 target: self selector: @selector(leveltimercallback:) userinfo: nil repeats: yes]; } else{     nslog(@"error%@",[error description]);     }        [recordbutton setimage:[uiimage imagenamed:@"record-h.png"] forstate:uicontrolstatenormal];          [timerlbl sethidden:false];          [lblhr sethidden:false];         [lblmnt sethidden:false];         [self togglerecording:nil];         startdate = [nsdate date] ;          startdate = [[startdate datebyaddingtimeinterval:((-1)*(pausetimeinterval))] retain];         timer = [nstimer scheduledtimerwithtimeinterval:1.0/10.0 target:self selector:@selector(updatetimer) userinfo:nil repeats:yes];       } 

and code start recording [self togglerecording:nil]; follows

- (ibaction)togglerecording:(id)sender    {      // start recording if there isn't recording running. stop recording if there is.       if ([uiimagepickercontroller issourcetypeavailable:sourcetype]) {        if (![[[self capturemanager] recorder] isrecording])        [[self capturemanager] startrecording];      else     [[self capturemanager] stoprecording];     }   } 

i setting avcapture session follows

  - (bool) setupsession    {      bool success = no;  // set torch , flash mode auto if ([[self backfacingcamera] hasflash]) {     if ([[self backfacingcamera] lockforconfiguration:nil]) {         if ([[self backfacingcamera] isflashmodesupported:avcaptureflashmodeauto]) {             [[self backfacingcamera] setflashmode:avcaptureflashmodeauto];         }         [[self backfacingcamera] unlockforconfiguration];     } } if ([[self backfacingcamera] hastorch]) {     if ([[self backfacingcamera] lockforconfiguration:nil]) {         if ([[self backfacingcamera] istorchmodesupported:avcapturetorchmodeauto]) {             [[self backfacingcamera] settorchmode:avcapturetorchmodeauto];         }         [[self backfacingcamera] unlockforconfiguration];     } }  // init device inputs avcapturedeviceinput *newvideoinput = [[avcapturedeviceinput alloc] initwithdevice:[self frontfacingcamera] error:nil]; avcapturedeviceinput *newaudioinput = [[avcapturedeviceinput alloc] initwithdevice:[self audiodevice] error:nil];   // setup still image file output avcapturestillimageoutput *newstillimageoutput = [[avcapturestillimageoutput alloc] init]; nsdictionary *outputsettings = [[nsdictionary alloc] initwithobjectsandkeys:                                 avvideocodecjpeg, avvideocodeckey,                                 nil]; [newstillimageoutput setoutputsettings:outputsettings]; [outputsettings release];   // create session (use default avcapturesessionpresethigh) avcapturesession *newcapturesession = [[avcapturesession alloc] init];   // add inputs , output capture session if ([newcapturesession canaddinput:newvideoinput]) {     [newcapturesession addinput:newvideoinput]; } if ([newcapturesession canaddinput:newaudioinput]) {     [newcapturesession addinput:newaudioinput]; } if ([newcapturesession canaddoutput:newstillimageoutput]) {     [newcapturesession addoutput:newstillimageoutput]; }  [self setstillimageoutput:newstillimageoutput]; [self setvideoinput:newvideoinput]; [self setaudioinput:newaudioinput]; [self setsession:newcapturesession];  [newstillimageoutput release]; [newvideoinput release]; [newaudioinput release]; [newcapturesession release];  // set movie file output nsurl *outputfileurl = [self tempfileurl]; avcamrecorder *newrecorder = [[avcamrecorder alloc] initwithsession:[self session] outputfileurl:outputfileurl]; [newrecorder setdelegate:self];  // send error delegate if video recording unavailable if (![newrecorder recordsvideo] && [newrecorder recordsaudio]) {     nsstring *localizeddescription = nslocalizedstring(@"video recording unavailable", @"video recording unavailable description");     nsstring *localizedfailurereason = nslocalizedstring(@"movies recorded on device contain audio. accessible through itunes file sharing.", @"video recording unavailable failure reason");     nsdictionary *errordict = [nsdictionary dictionarywithobjectsandkeys:                                localizeddescription, nslocalizeddescriptionkey,                                 localizedfailurereason, nslocalizedfailurereasonerrorkey,                                 nil];     nserror *novideoerror = [nserror errorwithdomain:@"avcam" code:0 userinfo:errordict];     if ([[self delegate] respondstoselector:@selector(capturemanager:didfailwitherror:)]) {         [[self delegate] capturemanager:self didfailwitherror:novideoerror];     } }  [self setrecorder:newrecorder];     [newrecorder release];      success = yes;      return success;   } 

i have googled , find solution here. using avcapturesession , avaudioplayer together