GPUImage原生美顏

GPUImage原生美顏

步驟一：使用Cocoapods導(dǎo)入GPUImage
步驟二：創(chuàng)建視頻源GPUImageVideoCamera
步驟三：創(chuàng)建最終目的源：GPUImageView
步驟四：創(chuàng)建濾鏡組(GPUImageFilterGroup)，需要組合亮度(GPUImageBrightnessFilter)和雙邊濾波(GPUImageBilateralFilter)這兩個濾鏡達到美顏效果.
步驟五：設(shè)置濾鏡組鏈
步驟六：設(shè)置GPUImage處理鏈，從數(shù)據(jù)源 => 濾鏡 => 最終界面效果
步驟七：開始采集視頻
注意點：

SessionPreset最好使用AVCaptureSessionPresetHigh，會自動識別，如果用太高分辨率，當(dāng)前設(shè)備不支持會直接報錯
GPUImageVideoCamera必須要強引用，否則會被銷毀，不能持續(xù)采集視頻.
必須調(diào)用startCameraCapture，底層才會把采集到的視頻源，渲染到GPUImageView中，就能顯示了。
GPUImageBilateralFilter的distanceNormalizationFactor值越小，磨皮效果越好,distanceNormalizationFactor取值范圍: 大于1。

#import "ViewController.h"
#import <GPUImage.h>
@interface ViewController ()
@property (nonatomic,strong)GPUImageVideoCamera * videoCamera;
@property (nonatomic,strong)GPUImageBilateralFilter * bilateralFilter;
@property (nonatomic,strong)GPUImageBrightnessFilter * brightnessFilter;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    GPUImageVideoCamera * videoCamera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPresetHigh cameraPosition:AVCaptureDevicePositionBack];
    videoCamera.outputImageOrientation =  UIInterfaceOrientationPortrait;
    self.videoCamera = videoCamera;
    
    GPUImageView * GPUImg = [[GPUImageView alloc] initWithFrame:self.view.bounds];
    [self.view insertSubview:GPUImg atIndex:0];
    
    //創(chuàng)建過濾：磨皮，美白，組合濾鏡
    GPUImageFilterGroup * groupFiler = [[GPUImageFilterGroup alloc] init];
    GPUImageBilateralFilter * bilateralFilter = [[GPUImageBilateralFilter alloc] init];
    self.bilateralFilter = bilateralFilter;
    GPUImageBrightnessFilter * brightnessFilter =[[GPUImageBrightnessFilter alloc] init];
    self.brightnessFilter = brightnessFilter;
    
    [groupFiler addTarget:bilateralFilter];
    [groupFiler addFilter:brightnessFilter];
    
    //設(shè)置濾鏡組鏈
    [self.bilateralFilter addTarget:brightnessFilter];
    [groupFiler setInitialFilters:@[self.bilateralFilter]];
    groupFiler.terminalFilter = brightnessFilter;
    
    //設(shè)置GPUImage響應(yīng)鏈，從數(shù)據(jù)源--》過濾--》最終界面
    [self.videoCamera addTarget:groupFiler];
    [groupFiler addTarget:GPUImg];
    //開始采集視頻
    [self.videoCamera startCameraCapture];
}

利用美顏濾鏡實現(xiàn)

步驟一：使用Cocoapods導(dǎo)入GPUImage
步驟二：導(dǎo)入GPUImageBeautifyFilter文件夾
步驟三：創(chuàng)建視頻源GPUImageVideoCamera
步驟四：創(chuàng)建最終目的源：GPUImageView
步驟五：創(chuàng)建最終美顏濾鏡：GPUImageBeautifyFilter
步驟六：設(shè)置GPUImage處理鏈，從數(shù)據(jù)源 => 濾鏡 => 最終界面效果
注意：

切換美顏效果原理：移除之前所有處理鏈，重新設(shè)置處理鏈

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    // 創(chuàng)建視頻源
    // SessionPreset:屏幕分辨率，AVCaptureSessionPresetHigh會自適應(yīng)高分辨率
    // cameraPosition:攝像頭方向
    GPUImageVideoCamera *videoCamera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPresetHigh cameraPosition:AVCaptureDevicePositionFront];
    videoCamera.outputImageOrientation = UIInterfaceOrientationPortrait;
    _videoCamera = videoCamera;
    // 創(chuàng)建最終預(yù)覽View
    GPUImageView *captureVideoPreview = [[GPUImageView alloc] initWithFrame:self.view.bounds];
    [self.view insertSubview:captureVideoPreview atIndex:0];
    _captureVideoPreview = captureVideoPreview;
    // 設(shè)置處理鏈
    [_videoCamera addTarget:_captureVideoPreview];
    // 必須調(diào)用startCameraCapture，底層才會把采集到的視頻源，渲染到GPUImageView中，就能顯示了。
    // 開始采集視頻
    [videoCamera startCameraCapture];
}
- (IBAction)openBeautifyFilter:(UISwitch *)sender {
    // 切換美顏效果原理：移除之前所有處理鏈，重新設(shè)置處理鏈
    if (sender.on) {
        // 移除之前所有處理鏈
        [_videoCamera removeAllTargets];
        // 創(chuàng)建美顏濾鏡
        GPUImageBeautifyFilter *beautifyFilter = [[GPUImageBeautifyFilter alloc] init];
        // 設(shè)置GPUImage處理鏈，從數(shù)據(jù)源 => 濾鏡 => 最終界面效果
        [_videoCamera addTarget:beautifyFilter];
        [beautifyFilter addTarget:_captureVideoPreview];
    } else {
        // 移除之前所有處理鏈
        [_videoCamera removeAllTargets];
        [_videoCamera addTarget:_captureVideoPreview];
    }
}

iOS10閃退 崩潰 This app has crashed because it attempted to access privacy-sensitive data without a usage description. The app's Info.plist must contain an NSCameraUsageDescription key with a string value explaining to the user how the app uses this data.

<key>NSCameraUsageDescription</key>    
<string>cameraDesciption</string>
<key>NSContactsUsageDescription</key>
<string>contactsDesciption</string>
<key>NSMicrophoneUsageDescription</key>
<string>microphoneDesciption</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>photoLibraryDesciption</string>