我有一个m3u8播放列表文件（让我们称之为素数），它指向另一个播放列表文件，该文件又具有包含密钥文件URL的ts URL。使用MPMoviePlayer我目前可以播放prime m3u8文件。 段是encrypted与AES-128位加密和密钥文件是在最后m3u8文件。有没有一种方法可以提供最终的m3u8文件并告诉应用程序使用本地密钥文件来解密视频，因此我不必公开发布密钥文件。它传递给玩家之前，可以修改最终M3U8文件 -如何通过分别提供密钥文件来播放m3u8加密播放列表？
这在一定程度上关系到this SO question
是。例如，将KEY行更改为http://localhost/key。然后你会想运行一个本地的http服务器，比如cocoahttpserver来把密钥交给视频播放器。
我已经实现了类似的东西。我们所做的是：
这里提到的与步骤的完整的工作代码：
//Step 1,2:- Initialise player, change the scheme from http to fakehttp and set delete of resource loader. These both steps will trigger the resource loader delegate function so that we can manually handle the loading of segments.
func setupPlayer(stream: String) {
operationQ.cancelAllOperations()
let blckOperation = BlockOperation {
let currentTStamp = Int(Date().timeIntervalSince1970 + 86400)//
let timeStamp = String(currentTStamp)
self.token = JWT.encode(["Expiry": timeStamp],
algorithm: .hs256("qwerty".data(using: .utf8)!))
self.asset = AVURLAsset(url: URL(string: "fake\(stream)")!, options: nil)
let loader = self.asset?.resourceLoader
loader?.setDelegate(self, queue: DispatchQueue.main)
self.asset!.loadValuesAsynchronously(forKeys: ["playable"], completionHandler: {
var error: NSError? = nil
let keyStatus = self.asset!.statusOfValue(forKey: "playable", error: &error)
if keyStatus == AVKeyValueStatus.failed {
print("asset status failed reason \(error)")
return
}
if !self.asset!.isPlayable {
//FIXME: Handle if asset is not playable
return
}
self.playerItem = AVPlayerItem(asset: self.asset!)
self.player = AVPlayer(playerItem: self.playerItem!)
self.playerView.playerLayer.player = self.player
self.playerLayer?.backgroundColor = UIColor.black.cgColor
self.playerLayer?.videoGravity = AVLayerVideoGravityResizeAspect
NotificationCenter.default.addObserver(self, selector: #selector(self.playerItemDidReachEnd(notification:)), name: Notification.Name.AVPlayerItemDidPlayToEndTime, object: self.playerItem!)
self.addObserver(self, forKeyPath: "player.currentItem.duration", options: [.new, .initial], context: &playerViewControllerKVOContext)
self.addObserver(self, forKeyPath: "player.rate", options: [.new, .old], context: &playerViewControllerKVOContext)
self.addObserver(self, forKeyPath: "player.currentItem.status", options: [.new, .initial], context: &playerViewControllerKVOContext)
self.addObserver(self, forKeyPath: "player.currentItem.loadedTimeRanges", options: [.new], context: &playerViewControllerKVOContext)
self.addObserver(self, forKeyPath: "player.currentItem.playbackLikelyToKeepUp", options: [.new], context: &playerViewControllerKVOContext)
self.addObserver(self, forKeyPath: "player.currentItem.playbackBufferEmpty", options: [.new], context: &playerViewControllerKVOContext)
})
}
operationQ.addOperation(blckOperation)
}
//Step 2, 3:- implement resource loader delegate functions and replace the fakehttp with http so that we can pass this m3u8 stream to the parser to get the current m3u8 in string format.
func resourceLoader(_ resourceLoader: AVAssetResourceLoader, shouldWaitForLoadingOfRequestedResource loadingRequest: AVAssetResourceLoadingRequest) -> Bool {
var url = loadingRequest.request.url?.absoluteString
let contentRequest = loadingRequest.contentInformationRequest
let dataRequest = loadingRequest.dataRequest
//Check if the it is a content request or data request, we have to check for data request and do the m3u8 file manipulation
if (contentRequest != nil) {
contentRequest?.isByteRangeAccessSupported = true
}
if (dataRequest != nil) {
//this is data request so processing the url. change the scheme to http
url = url?.replacingOccurrences(of: "fakehttp", with: "http")
if (url?.contains(".m3u8"))!
{
// do the parsing on background thread to avoid lags
// step 4:
self.parsingHandler(url: url!, loadingRequest: loadingRequest, completion: { (success) in
return true
})
}
else if (url?.contains(".ts"))! {
let redirect = self.generateRedirectURL(sourceURL: url!)
if (redirect != nil) {
//Step 9 and 10:-
loadingRequest.redirect = redirect!
let response = HTTPURLResponse(url: URL(string: url!)!, statusCode: 302, httpVersion: nil, headerFields: nil)
loadingRequest.response = response
loadingRequest.finishLoading()
}
return true
}
return true
}
return true
}
func parsingHandler(url: String, loadingRequest: AVAssetResourceLoadingRequest, completion:((Bool)->Void)?) -> Void {
DispatchQueue.global(qos: .background).async {
var string = ""
var originalURIStrings = [String]()
var updatedURIStrings = [String]()
do {
let model = try M3U8PlaylistModel(url: url)
if model.masterPlaylist == nil {
//Step 5:-
string = model.mainMediaPl.originalText
let array = string.components(separatedBy: CharacterSet.newlines)
if array.count > 0 {
for line in array {
//Step 6:-
if line.contains("EXT-X-KEY:") {
//at this point we have the ext-x-key tag line. now tokenize it with , and then
let furtherComponents = line.components(separatedBy: ",")
for component in furtherComponents {
if component.contains("URI") {
// Step 7:-
//save orignal URI string to replaced later
originalURIStrings.append(component)
//now we have the URI
//get the string in double quotes
var finalString = component.replacingOccurrences(of: "URI=\"", with: "").replacingOccurrences(of: "\"", with: "")
finalString = "\"" + finalString + "&token=" + self.token! + "\""
finalString = "URI=" + finalString
updatedURIStrings.append(finalString)
}
}
}
}
}
if originalURIStrings.count == updatedURIStrings.count {
//Step 8:-
for uriElement in originalURIStrings {
string = string.replacingOccurrences(of: uriElement, with: updatedURIStrings[originalURIStrings.index(of: uriElement)!])
}
//print("String After replacing URIs \n")
//print(string)
}
}
else {
string = model.masterPlaylist.originalText
}
}
catch let error {
print("Exception encountered")
}
loadingRequest.dataRequest?.respond(with: string.data(using: String.Encoding.utf8)!)
loadingRequest.finishLoading()
if completion != nil {
completion!(true)
}
}
}
func generateRedirectURL(sourceURL: String)-> URLRequest? {
let redirect = URLRequest(url: URL(string: sourceURL)!)
return redirect
}
希望这会有所帮助！
我的意思是有一种方法可以将密钥文件本地存储在应用程序中，而不是通过互联网发布它 – kitwalker
@kitwalker呃，是的，这正是我在回答中所描述的。它必须通过HTTP传送，但不需要通过互联网传送。 – vipw
谢谢。我会尽力做到这一点。 – kitwalker