iphone - AVCaptureSession With STT(Speech to text) -

i using avcapture session record video same time using stt(google speech text api) convert voice text. have facing problem when click on speak button camera freezes. correct answer acceptable. in advance .

to start camera in

-(void)viewdidload;       if ([[self capturemanager] setupsession]) {             // create video preview layer , add ui             avcapturevideopreviewlayer *newcapturevideopreviewlayer = [[avcapturevideopreviewlayer alloc] initwithsession:[[self capturemanager] session]];             uiview *view = [self videopreviewview];             calayer *viewlayer = [view layer];             [viewlayer setmaskstobounds:yes];              cgrect bounds = [view bounds];             [newcapturevideopreviewlayer setframe:bounds];              if ([newcapturevideopreviewlayer isorientationsupported]) {                 [newcapturevideopreviewlayer setorientation:avcapturevideoorientationlandscapeleft|avcapturevideoorientationlandscaperight];             }              [newcapturevideopreviewlayer setvideogravity:avlayervideogravityresizeaspectfill];              [viewlayer insertsublayer:newcapturevideopreviewlayer below:[[viewlayer sublayers] objectatindex:0]];              [self setcapturevideopreviewlayer:newcapturevideopreviewlayer];             [newcapturevideopreviewlayer release];              // start session. done asychronously since -startrunning doesn't return until session running.             dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{                 [[[self capturemanager] session] startrunning];             });              [self updatebuttonstates];     }           - (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; }