Convert AVPlayer NSData to NSString (Or player format) - objective-c

Question

I need to know how to convert saved NSData from an AVPlayer back into a playable format. But I cannot figure out how to convert this NSData into a dataString, which would then allow me to create and NSUrl. Let's say I have the following code:
NSURL *videoUrl=(NSURL*)[info objectForKey:UIImagePickerControllerMediaURL];
self.data=[NSData dataWithContentsOfURL:videoUrl];
Now later on when I get this data back, I call:
NSString *dataString = [NSString stringWithUTF8String:[self.data bytes]];
But the dataString is always nil. Why? Am I decoding it in the wrong format or something?

Answer 1

A URL is a reference to data. The data is a (possibly complicated) encoding of something like a movie.
I am not sure exactly what you are asking, but I think you want to get the data (as an NSData object) and then save it somewhere. If this is correct, then what you need to do is
[self.data writeToFile:myFilePath atomically:YES]
where myFilePath is a path to somewhere where you can store files.

Answer 2

You could implement AVAssetResourceLoaderDelegate to provide data for AVPlayer.
func resourceLoader(resourceLoader: AVAssetResourceLoader!, shouldWaitForLoadingOfRequestedResource loadingRequest: AVAssetResourceLoadingRequest!) -> Bool {
if let data = videoData {
dispatch_async(dispatch_get_main_queue()) { () -> Void in
if let infoRequest = loadingRequest.contentInformationRequest {
infoRequest.contentType = "public.mpeg-4" // UTI
infoRequest.contentLength = Int64(data.length)
infoRequest.byteRangeAccessSupported = true
}
if let request = loadingRequest.dataRequest {
let part = data.subdataWithRange(NSRange(location: Int(request.requestedOffset), length: Int(request.requestedLength)))
request.respondWithData(part)
}
loadingRequest.finishLoading()
}
return true
}
return false
}
To create an AVPlayer:
let asset = AVURLAsset(URL: NSURL(scheme: "yourcustomscheme", host: nil, path: "/pathtovideo"), options: nil)
asset.resourceLoader.setDelegate(self, queue: dispatch_get_main_queue())
let item = AVPlayerItem(asset: asset)
let player = AVPlayer(playerItem: item)