将AVVideoComposition初始化程序转换为Nativescript

Question

寻找一些关于将这个objective类方法移植到JS/nativescript的帮助。我尝试过的每一个变体都产生了一个TypeError: undefined is not a function...

https://developer.apple.com/documentation/avfoundation/avvideocomposition/1389556-init

我试着用JS写成：

const videoComp = AVVideoComposition.alloc().initWithAssetApplyingCIFiltersWithHandler(asset, (request) => { ... });

//OR
const videoComp = AVVideoComposition.alloc().initAssetApplyingCIFiltersWithHandler(asset, (request) => { ... });

//OR
const videoComp = AVVideoComposition.alloc().initAssetApplyingCIFiltersWithHandlerApplier(asset, (request) => { ... });

//OR
const videoComp = new AVVideoComposition(asset, (request) => { ... });

举几个例子。实际上，我试图将此代码移植到nativescript/JS：

let blurRadius = 6.0
let asset = AVAsset(url: streamURL)
let item = AVPlayerItem(asset: asset)
item.videoComposition= AVVideoComposition(asset: asset) { request in
    let blurred = request.sourceImage.clampedToExtent().applyingGaussianBlur(sigma: blurRadius)
    let output = blurred.clampedToRect(request.sourceImage.extent)
    request.finish(with: output, context: nil)
}

在这篇博客文章中可以找到：https://willowtreeapps.com/ideas/how-to-apply-a-filter-to-a-video-stream-in-ios

Answer 1

JavaScript /类型记录应该是这样的，

let blurRadius = 6.0;
let asset = AVAsset.assetWithURL(streamURL);
let item = AVPlayerItem.alloc().initWithAsset(asset);
item.videoComposition = AVVideoComposition.videoCompositionWithAssetApplyingCIFiltersWithHandler(asset, request => {
    let blurred = request.sourceImage.imageByClampingToExtent().imageByApplyingGaussianBlurWithSigma(blurRadius);
    let output = blurred.imageByClampingToRect(request.sourceImage.extent);
    request.finishWithImageContext(output, null);
});

注释：代码未经测试，仅仅是给定本机代码的翻译。利用tns-平台-声明对IntelliSense的支持。