如何使用AVFoundation框架创建和添加像Instagram这样的videofilter – Swift编程

我正在使用Swift编程处理AVFoundation框架。 有人可以帮我找一些教程或链接或代码片段来应用类似于Instagram的videofilter。

我正在研究iOSvideo创建器类型的应用程序，它记录video，后来我可以应用filter到video。

提前致谢。

Answer 1

您应该查看Apple的示例项目RosyWriter。 它是您想要实现的目标的一个很好的例子。

https://developer.apple.com/library/prerelease/ios/samplecode/RosyWriter/Introduction/Intro.html#//apple_ref/doc/uid/DTS40011110

此外，您还可以查看GLImageProcessing示例项目。

https://developer.apple.com/library/ios/samplecode/GLImageProcessing/Introduction/Intro.html

希望有所帮助！

Answer 2

从iOS 9.0开始，您可以使用AVVideoComposition逐帧应用核心图像滤镜。

let filter = CIFilter(name: "CIGaussianBlur")! let composition = AVVideoComposition(asset: asset, applyingCIFiltersWithHandler: { request in // Clamp to avoid blurring transparent pixels at the image edges let source = request.sourceImage.imageByClampingToExtent() filter.setValue(source, forKey: kCIInputImageKey) // Vary filter parameters based on video timing let seconds = CMTimeGetSeconds(request.compositionTime) filter.setValue(seconds * 10.0, forKey: kCIInputRadiusKey) // Crop the blurred output to the bounds of the original image let output = filter.outputImage!.imageByCroppingToRect(request.sourceImage.extent) // Provide the filter output to the composition request.finishWithImage(output, context: nil) // Clamp to avoid blurring transparent pixels at the image edges let source = request.sourceImage.clampedToExtent() filter.setValue(source, forKey: kCIInputImageKey) //Vary filter parameters based on video timing let seconds = CMTimeGetSeconds(request.compositionTime) filter.setValue(seconds * 10.0, forKey: kCIInputRadiusKey) // Crop the blurred output to the bounds of the original image let output = filter.outputImage!.cropped(to: request.sourceImage.extent) request.finish(with: output, context: nil) }) 

现在我们可以使用之前创建的资产创建AVPlayerItem并使用AVPlayer播放它

 let playerItem = AVPlayerItem(asset: asset) playerItem.videoComposition = composition let player = AVPlayer(playerItem: playerItem) player.play() 

核心图像filter逐帧实时添加。 您还可以使用AVAssetExportSession类导出video。

这里是WWDC 2015的精彩介绍： https ： //developer.apple.com/videos/play/wwdc2015/510/？ time = 1222