前言：發(fā)現(xiàn)網(wǎng)上GPUImage2的資源比較少，我最近又在使用這個(gè)庫(kù)，所以我就把我使用的情況總結(jié)下吧。需要的人自取哦！

首先感謝@Willie文章提供參考

安裝

1.pod安裝

傳送門
這個(gè)是英文版的。內(nèi)容如下

• 下載GPUImage2.podspec文件下載地址(路徑與Podfle同層級(jí))
• Podfile中添加 pod 'GPUImage2', :podspec => './GPUImage2.podspec'
• pod install
• import GPUImage2

2.直接導(dǎo)入庫(kù)
原庫(kù)下載地址

同@Willie文章導(dǎo)入 不同在于：不導(dǎo)入Source文件夾，其他一樣

如果需要更改庫(kù)的話，建議直接導(dǎo)入庫(kù)的方式使用

簡(jiǎn)單使用

1.創(chuàng)建濾鏡視頻

do {

    camera = try Camera(sessionPreset: .vga640x480,
                        cameraDevice: nil,
                        location: .frontFacing,
                        captureAsYUV: true)

    
} catch {
    
    print(error)
    return
}
//磨皮 - 美白
let basicOperation = BilateralBlur()
basicOperation.distanceNormalizationFactor = 7
        
let brightnessAdjustment = BrightnessAdjustment()
brightnessAdjustment.brightness = 0.11

//顯示
renderView = RenderView(frame: view.bounds)
view.addSubview(renderView)

camera --> brightnessAdjustment --> basicOperation --> renderView
basicOperation --> self.videoOutput

2.獲取濾鏡后的視頻流

// 全局變量
videoOutput = RawDataOutput()
   
// 這里是修改源碼，增加的一個(gè)方法（修改見下3）     
videoOutput.dataAvailableCallbackSize = { [weak self] (videoData, framebuffer, cmtime) in
    
    guard let `self` = self else { return }
    
    let numberOfBytesPerRow = framebuffer.size.width
    let getData = Data(bytes: videoData)
    
    getData.withUnsafeBytes { (u8Ptr: UnsafePointer<UInt8>) -> Void in
        let rawPtr = UnsafeMutableRawPointer(mutating: u8Ptr)
        var pixelBuffer : CVPixelBuffer?;
        _ = CVPixelBufferCreateWithBytes(kCFAllocatorDefault,
                                         Int(framebuffer.size.width),
                                         Int(framebuffer.size.height),
                                         kCVPixelFormatType_32BGRA,
                                         rawPtr,
                                         Int(numberOfBytesPerRow*4), nil, nil, nil,
                                         &pixelBuffer);
        if pixelBuffer != nil {
            
            // 獲取到后，做點(diǎn)什么？
            
        }
    }
}

3.修改RawDataOutput

一、添加屬性

public var dataAvailableCallbackSize:(([UInt8], _ frameBuffer: Framebuffer, _ cmtime: CMTime) -> ())?

二、在newFramebufferAvailable方法最后面調(diào)用

var time: CMTime = CMTime(seconds: 0, preferredTimescale: 1000)
if let timestamp = framebuffer.timingStyle.timestamp {
    time = CMTime(value: timestamp.value, timescale: timestamp.timescale)
}
dataAvailableCallbackSize?(data, framebuffer, time)

三、會(huì)出現(xiàn)藍(lán)色陰影？？？

修改文件中 GL_RGBA為GL_BGRA

glReadPixels(0, 0, framebuffer.size.width, framebuffer.size.height, GLenum(GL_BGRA), GLenum(GL_UNSIGNED_BYTE), &data)

4.切換攝像頭，修改 Camera

增加方法，外部直接調(diào)用即可

public func switchCamera() {
    
    self.location = self.location == .backFacing ? .frontFacing : .backFacing;

}

修改原屬性 location

public var location:PhysicalCameraLocation {
    didSet {
        // TODO: Swap the camera locations, framebuffers as needed
        guard let newVideoInput = try? AVCaptureDeviceInput(device: location.device()!) else { return }
        
        self.captureSession.beginConfiguration()
        self.captureSession.removeInput(self.videoInput)
        self.captureSession.addInput(newVideoInput)
        self.captureSession.commitConfiguration()
        self.videoInput = newVideoInput
    }
}

5.視屏鏡像

     var captureConnection: AVCaptureConnection!
    for connection in videoOutput.connections {
        for port in connection.inputPorts {
            if (port as AnyObject).mediaType == AVMediaType.video {
                captureConnection = connection
                captureConnection.isVideoMirrored = location == .frontFacing
            }
        }
    }
    
    if captureConnection.isVideoOrientationSupported {
        captureConnection.videoOrientation = .portraitUpsideDown
    }

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