在swift 2中无法使用AVCaptureVideoDataOutput通过CGDataProviderCopyData获取像素数据

我正在更新这个 swift 2.0，我目前得到fatal error: unexpectedly found nil while unwrapping an Optional value上线： let data = CGDataProviderCopyData(CGImageGetDataProvider(imageRef)) as! NSData let data = CGDataProviderCopyData(CGImageGetDataProvider(imageRef)) as! NSData

 func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!) { print("Capture output running") let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) CVPixelBufferLockBaseAddress(imageBuffer!, 0) let baseAddress = CVPixelBufferGetBaseAddressOfPlane(imageBuffer!, 0) let bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer!) let width = CVPixelBufferGetWidth(imageBuffer!) let height = CVPixelBufferGetHeight(imageBuffer!) let colorSpace = CGColorSpaceCreateDeviceRGB() let bitmapInfo = UInt32(CGBitmapInfo.ByteOrder32Big.rawValue) //Original version of above line //var bitmapInfo = CGBitmapInfo.fromRaw(CGImageAlphaInfo.PremultipliedFirst.toRaw())! | CGBitmapInfo.ByteOrder32Little let context = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, bitmapInfo) let imageRef = CGBitmapContextCreateImage(context) CVPixelBufferUnlockBaseAddress(imageBuffer!, 0) let data = CGDataProviderCopyData(CGImageGetDataProvider(imageRef)) as! NSData let pixels = UnsafePointer<UInt8>(data.bytes) let imageSize : Int = Int(width) * Int(height) * 4 var newPixelArray = [UInt8](count: imageSize, repeatedValue: 0) for index in 0.stride(to: data.length, by: 4) { newPixelArray[index] = 255 - pixels[index] newPixelArray[index + 1] = 255 - pixels[index + 1] newPixelArray[index + 2] = 255 - pixels[index + 2] newPixelArray[index + 3] = pixels[index + 3] print(newPixelArray[index]) } //remainder of function } 

Answer 1

固定！ 注意let data:NSData...行

 func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!) { print("Capture output running") let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) CVPixelBufferLockBaseAddress(imageBuffer!, 0) let baseAddress = CVPixelBufferGetBaseAddressOfPlane(imageBuffer!, 0) let bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer!) let width = CVPixelBufferGetWidth(imageBuffer!) let height = CVPixelBufferGetHeight(imageBuffer!) let colorSpace = CGColorSpaceCreateDeviceRGB() let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedFirst.rawValue).rawValue | CGBitmapInfo.ByteOrder32Little.rawValue let context = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, bitmapInfo) let imageRef = CGBitmapContextCreateImage(context) CVPixelBufferUnlockBaseAddress(imageBuffer!, 0) let data:NSData = CGDataProviderCopyData(CGImageGetDataProvider(imageRef))! let pixels = UnsafePointer<UInt8>(data.bytes) let imageSize : Int = Int(width) * Int(height) * 4 var newPixelArray = [UInt8](count: imageSize, repeatedValue: 0) for index in 0.stride(to: data.length, by: 4) { newPixelArray[index] = 255 - pixels[index] newPixelArray[index + 1] = 255 - pixels[index + 1] newPixelArray[index + 2] = 255 - pixels[index + 2] newPixelArray[index + 3] = pixels[index + 3] print(newPixelArray[index+1]) } }