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#import "ViewController.h" | |
#import <CoreImage/CoreImage.h> | |
#import <AVFoundation/AVFoundation.h> | |
@interface ViewController () { | |
} | |
@property (strong, nonatomic) CIContext *coreImageContext; | |
@property (strong, nonatomic) AVCaptureSession *cameraSession; | |
@property (strong, nonatomic) AVCaptureVideoDataOutput *videoOutput; | |
@property (strong, nonatomic) UIView *blurCameraView; | |
@property (strong, nonatomic) CIFilter *filter; | |
@property BOOL cameraOpen; | |
@end | |
@implementation ViewController | |
- (void)viewDidLoad { | |
[super viewDidLoad]; | |
self.blurCameraView = [[UIView alloc]initWithFrame:[[UIScreen mainScreen] bounds]]; | |
[self.view addSubview:self.blurCameraView]; | |
//setup filter | |
self.filter = [CIFilter filterWithName:@"CIGaussianBlur"]; | |
[self.filter setDefaults]; | |
[self.filter setValue:@(3.0f) forKey:@"inputRadius"]; | |
[self setupCamera]; | |
[self openCamera]; | |
// Do any additional setup after loading the view, typically from a nib. | |
} | |
- (void)didReceiveMemoryWarning { | |
[super didReceiveMemoryWarning]; | |
// Dispose of any resources that can be recreated. | |
} | |
- (void)setupCamera | |
{ | |
self.coreImageContext = [CIContext contextWithOptions:@{kCIContextUseSoftwareRenderer : @(YES)}]; | |
// session | |
self.cameraSession = [[AVCaptureSession alloc] init]; | |
[self.cameraSession setSessionPreset:AVCaptureSessionPresetLow]; | |
[self.cameraSession commitConfiguration]; | |
// input | |
AVCaptureDevice *shootingCamera = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; | |
AVCaptureDeviceInput *shootingDevice = [AVCaptureDeviceInput deviceInputWithDevice:shootingCamera error:NULL]; | |
if ([self.cameraSession canAddInput:shootingDevice]) { | |
[self.cameraSession addInput:shootingDevice]; | |
} | |
// video output | |
self.videoOutput = [[AVCaptureVideoDataOutput alloc] init]; | |
self.videoOutput.alwaysDiscardsLateVideoFrames = YES; | |
[self.videoOutput setSampleBufferDelegate:self queue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)]; | |
if ([self.cameraSession canAddOutput:self.videoOutput]) { | |
[self.cameraSession addOutput:self.videoOutput]; | |
} | |
if (self.videoOutput.connections.count > 0) { | |
AVCaptureConnection *connection = self.videoOutput.connections[0]; | |
connection.videoOrientation = AVCaptureVideoOrientationPortrait; | |
} | |
self.cameraOpen = NO; | |
} | |
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { | |
// Get a CMSampleBuffer's Core Video image buffer for the media data | |
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); | |
// turn buffer into an image we can manipulate | |
CIImage *result = [CIImage imageWithCVPixelBuffer:imageBuffer]; | |
// filter | |
[self.filter setValue:result forKey:@"inputImage"]; | |
// render image | |
CGImageRef blurredImage = [self.coreImageContext createCGImage:self.filter.outputImage fromRect:result.extent]; | |
dispatch_async(dispatch_get_main_queue(), ^{ | |
self.blurCameraView.layer.contents = (__bridge id)blurredImage; | |
CGImageRelease(blurredImage); | |
}); | |
} | |
- (void)openCamera { | |
if (self.cameraOpen) { | |
return; | |
} | |
self.blurCameraView.alpha = 0.0f; | |
[self.cameraSession startRunning]; | |
[self.view layoutIfNeeded]; | |
[UIView animateWithDuration:3.0f animations:^{ | |
self.blurCameraView.alpha = 1.0f; | |
}]; | |
self.cameraOpen = YES; | |
} |
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