how to correctly start a camera session using AVCapture session/AVCapture

Question

I want to make an iOS app in objective C. Right now I'm stuck on making the preview layer to the AVCapture preview output. Could someone please tell me how to successfully start an image capture session using the AVCapture camera session in iOS Objective C? Any help is much appreciated. Thank you.

Show your code until now what you have tried – user3182143 Aug 19 '16 at 13:45 — user3182143, Aug 19 '16 at 13:45

score 4 · Answer 1 · answered Aug 19 '16 at 13:55

I give you answer for AVCaptureSession

-(void)capture
{ 
   NSError *error=nil;
   //Capture Session
   AVCaptureSession *session = [[AVCaptureSession alloc]init];
   session.sessionPreset = AVCaptureSessionPresetPhoto;

   //Add device
   AVCaptureDevice *inputDevice = nil;
   NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
   for(AVCaptureDevice *camera in devices)
   {
      if([camera position] == AVCaptureDevicePositionBack)  // is Back camera 
      { 
         inputDevice = camera;
         break;
      }
   }
   [session addInput:inputDevice];

    //Output
    AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];
    [session addOutput:output];
    output.videoSettings = @{ (NSString *)kCVPixelBufferPixelFormatTypeKey : @(kCVPixelFormatType_32BGRA) };

    //Preview Layer
    AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
    previewLayer.frame = viewForCamera.bounds;
    previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    [viewForCamera.layer addSublayer:previewLayer];

    //Start capture session
    [session startRunning];
}

Thank you. Let me try this. – sreejesh Aug 19 '16 at 14:12 — sreejesh, Aug 19 '16 at 14:12

score 0 · Answer 2 · edited Jan 27 '17 at 23:08

Try this code to get camera id.

NSString *cameraID = nil;

NSArray *captureDeviceType = @[AVCaptureDeviceTypeBuiltInWideAngleCamera];
AVCaptureDeviceDiscoverySession *captureDevice = 
              [AVCaptureDeviceDiscoverySession 
                discoverySessionWithDeviceTypes:captureDeviceType 
                mediaType:AVMediaTypeVideo 
                position:AVCaptureDevicePositionUnspecified];

cameraID = [captureDevice.devices.lastObject localizedName];

how to correctly start a camera session using AVCapture session/AVCapture

2 Answers2