I am creating a function to download M3u8 files in iOS. I can download the M3u8 but I want the ability to restore a pending download if the app is paused or quit. Below is the main documentation I used but I can't get the restore function to work as intended.
Below is what I use to download the M3U8:
private var config: URLSessionConfiguration!
var downloadSession: AVAssetDownloadURLSession!
var downloadTask: AVAssetDownloadTask!
var mediaSelectionMap = [AVAssetDownloadTask : AVMediaSelection]()
let downloadIdentifier = "mySession"
func assetDownload(url: URL) {
print("Download started...")
//Create new background session configuration
let configuration = URLSessionConfiguration.background(withIdentifier: downloadIdentifier)
//Create a new AVAssetDownloadURLSession with background config, delegate and queue
let downloadSession = AVAssetDownloadURLSession(configuration: configuration, assetDownloadDelegate: self, delegateQueue: OperationQueue.main)
downloadSession.getAllTasks { (taskArray) in
//Task array always nil when segment should be found
if taskArray.count > 0 {
print("Check if to resume previous download")
self.restorePendingDownloads()
} else {
let asset = AVURLAsset(url: url)
print("New Movie downloading")
//Create new AVAssetDownloadTask for the desired asset
self.downloadTask = downloadSession.makeAssetDownloadTask(asset: asset, assetTitle: "VideoSample", assetArtworkData: nil, options: [AVAssetDownloadTaskMinimumRequiredMediaBitrateKey: NSNumber(value: 0)])
//Start task and begin download
self.downloadTask?.resume()
}
}
}
Below is the restore pending function:
func restorePendingDownloads() {
print("restore pending download...")
// Create session configuration with ORIGINAL download identifier
config = URLSessionConfiguration.background(withIdentifier: downloadIdentifier)
// Create a new AVAssetDownloadURLSession
downloadSession = AVAssetDownloadURLSession(configuration: config,
assetDownloadDelegate: self,
delegateQueue: OperationQueue.main)
// Grab all the pending tasks associated with the downloadSession
downloadSession.getAllTasks { tasksArray in
print("getting all tasks.. \(tasksArray.count)") //returns 0
// For each task, restore the state in the app
for task in tasksArray {
guard let downloadTask = task as? AVAssetDownloadTask else { break }
// Restore asset, progress indicators, state, etc...
let asset = downloadTask.urlAsset
print("asset:\(asset)")
//NEVER CALLED BECAUSE EMPTY
}
}
}
Someone recommended using the function below but this just reset the download to the beginning.
func restorePendingDownload(url: URL){
let urlAsset = AVURLAsset(url: url)
downloadTask = downloadSession.makeAssetDownloadTask(asset: urlAsset, assetTitle: "master", assetArtworkData: nil, options: nil)
downloadTask.resume()
}
UPDATE
I found a solution for the pause resume function but not on how to resume when the app is quit.
I added this function which stores the destinationURL when paused and can be used in the restore pending function.
func urlSession(_ session: URLSession, assetDownloadTask: AVAssetDownloadTask, didFinishDownloadingTo location: URL) {
// Do not move the asset from the download location
UserDefaults.standard.set(location.relativePath, forKey: "assetPath")
destinationURL = location
}
in donwload asset function, I changed the following line from:
self.downloadTask = downloadSession.makeAssetDownloadTask(asset: asset, assetTitle: "VideoSample", assetArtworkData: nil, options: [AVAssetDownloadTaskMinimumRequiredMediaBitrateKey: NSNumber(value: 0)])
to:
self.downloadTask = downloadSession.makeAssetDownloadTask(asset: asset, assetTitle: "VideoSample", assetArtworkData: nil, options: nil)
I think to set the minimum requirement was causing the issue.
Any help or direction in how to restore the pending download when quitting the application would be amazing. Thanks
