public void DidCompleteForMediaSelection(NSUrlSession session, AVAggregateAssetDownloadTask aggregateAssetDownloadTask, AVMediaSelection mediaSelection)
{
/*
* This delegate callback provides an AVMediaSelection object which is now fully available for
* offline use. You can perform any additional processing with the object here.
*/
Asset asset = null;
activeDownloadsMap.TryGetValue(aggregateAssetDownloadTask, out asset);
if (asset == null || Asset.Keys.Name != asset.Stream.Name)
{
return;
}
aggregateAssetDownloadTask.TaskDescription = asset.Stream.Name;
aggregateAssetDownloadTask.Resume();
var userInfo = new Dictionary <string, string>();
userInfo[Asset.Keys.DownloadState] = new NSString(Asset.Keys.DownloadState.ToString());
userInfo[Asset.Keys.DownloadSelectionDisplayName] = new NSString(GetDisplayNamesForSelectedMediaOptions(mediaSelection));
var userInfoDictionary = NSDictionary.FromObjectsAndKeys(userInfo.Values.ToArray(), userInfo.Keys.ToArray());
NSNotificationCenter.DefaultCenter.PostNotificationName(AssetPersistenceManager.AssetDownloadStateChanged, null, userInfoDictionary);
}
public void DidLoadTimeRange(NSUrlSession session, AVAggregateAssetDownloadTask aggregateAssetDownloadTask, CoreMedia.CMTimeRange timeRange, NSValue[] loadedTimeRanges, CoreMedia.CMTimeRange timeRangeExpectedToLoad, AVMediaSelection mediaSelection)
{
// This delegate callback should be used to provide download progress for your AVAssetDownloadTask.
if (!activeDownloadsMap.ContainsKey(aggregateAssetDownloadTask))
{
return;
}
var asset = activeDownloadsMap[aggregateAssetDownloadTask];
var percentComplete = 0.0;
foreach (var value in loadedTimeRanges)
{
var loadedTimeRange = value.CMTimeRangeValue;
percentComplete += loadedTimeRange.Duration.Seconds / timeRangeExpectedToLoad.Duration.Seconds;
}
var userInfo = new Dictionary <string, object>();
userInfo[Asset.Keys.Name] = new NSString(asset.Stream.Name);
userInfo[Asset.Keys.PercentDownloaded] = new NSNumber(percentComplete);
var userInfoDictionary = NSDictionary.FromObjectsAndKeys(userInfo.Values.ToArray(), userInfo.Keys.ToArray());
NSNotificationCenter.DefaultCenter.PostNotificationName(AssetPersistenceManager.AssetDownloadProgress, null, userInfoDictionary);
}
public void WillDownloadToUrl(NSUrlSession session, AVAggregateAssetDownloadTask aggregateAssetDownloadTask, NSUrl location)
{
/*
* This delegate callback should only be used to save the location URL
* somewhere in your application. Any additional work should be done in
* `URLSessionTaskDelegate.urlSession(_:task:didCompleteWithError:)`.
*/
willDownloadToUrlMap[aggregateAssetDownloadTask] = location;
}
internal void DownloadAssetStream(Asset asset)
{
// Get the default media selections for the asset's media selection groups.
var preferredMediaSelection = asset.UrlAsset.PreferredMediaSelection;
///*
// Creates and initializes an AVAggregateAssetDownloadTask to download multiple AVMediaSelections
// on an AVURLAsset.
// For the initial download, we ask the URLSession for an AVAssetDownloadTask with a minimum bitrate
// corresponding with one of the lower bitrate variants in the asset.
// */
AVAggregateAssetDownloadTask task = null;
try
{
var dictionary = new NSDictionary <NSString, NSObject>(new NSString("AVAssetDownloadTaskMinimumRequiredMediaBitrateKey"), (NSObject)(new NSNumber(265_000)));
task = assetDownloadUrlSession.GetAssetDownloadTask(asset.UrlAsset,
new AVMediaSelection[] { preferredMediaSelection },
asset.Stream.Name,
null,
dictionary);
task.TaskDescription = asset.Stream.Name;
activeDownloadsMap.Add(task, asset);
task.Resume();
var userInfo = new Dictionary <string, object>();
userInfo[Asset.Keys.Name] = asset.Stream.Name;
userInfo[Asset.Keys.DownloadState] = AssetDownloadState.Downloading.ToString();
userInfo[Asset.Keys.DownloadSelectionDisplayName] = GetDisplayNamesForSelectedMediaOptions(preferredMediaSelection);
var userInfoDictionary = NSDictionary.FromObjectsAndKeys(userInfo.Values.ToArray(), userInfo.Keys.ToArray());
NSNotificationCenter.DefaultCenter.PostNotificationName(AssetPersistenceManager.AssetDownloadStateChanged, null, userInfoDictionary);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
public async Task RestorePersistenceManager()
{
if (didRestorePersistenceManager)
{
return;
}
didRestorePersistenceManager = true;
// Grab all the tasks associated with the assetDownloadURLSession
TaskCompletionSource <NSUrlSessionTask[]> tcs = new TaskCompletionSource <NSUrlSessionTask[]>();
assetDownloadUrlSession.GetAllTasks((tasks) => tcs.TrySetResult(tasks));
await tcs.Task;
if (!tcs.Task.IsCompleted)
{
throw new Exception("Error restoring persistence manager state", tcs.Task?.Exception);
}
foreach (var task in tcs.Task?.Result)
{
if (!(task is AVAggregateAssetDownloadTask))
{
break;
}
AVAggregateAssetDownloadTask assetDownloadTask = task as AVAggregateAssetDownloadTask;
var assetName = assetDownloadTask.TaskDescription;
var urlAsset = assetDownloadTask.UrlAsset;
var stream = StreamListManager.Current.Streams.FirstOrDefault(i => i.Name == assetName);
var asset = new Asset(stream, urlAsset);
activeDownloadsMap[assetDownloadTask] = asset;
}
NSNotificationCenter.DefaultCenter.PostNotificationName(AssetPersistenceManager.AssetPersistenceManagerDidRestoreState, null);
}
public void DidCompleteWithError(NSUrlSession session, NSUrlSessionTask task, NSError error)
{
var userDefaults = NSUserDefaults.StandardUserDefaults;
Asset asset = null;
NSUrl downloadURL = null;
AVAggregateAssetDownloadTask avTask = task as AVAggregateAssetDownloadTask;
if (avTask == null ||
!activeDownloadsMap.TryGetValue(avTask, out asset) ||
!willDownloadToUrlMap.TryGetValue(avTask, out downloadURL))
{
return;
}
var userInfo = new Dictionary <string, string>();
userInfo[Asset.Keys.Name] = new NSString(asset.Stream.Name);
if (error != null)
{
switch (error.Code)
{
case (int)NSUrlError.Cancelled:
/*
* This task was canceled, you should perform cleanup using the
* URL saved from AVAssetDownloadDelegate.urlSession(_:assetDownloadTask:didFinishDownloadingTo:).
*/
var localFileLocation = LocalAssetForStream(asset.Stream.Name)?.UrlAsset.Url;
if (localFileLocation == null)
{
return;
}
try
{
NSError err = null;
NSFileManager.DefaultManager.Remove(localFileLocation, out err);
}
catch (Exception ex)
{
Debug.WriteLine($"An error occured trying to delete the contents on disk for {asset.Stream.Name}: {ex.Message}");
}
userInfo[Asset.Keys.DownloadState] = new NSString(AssetDownloadState.NotDownloaded.ToString());
break;
case (int)NSUrlError.Unknown:
throw new Exception("Downloading HLS streams is not supported in the simulator.");
default:
throw new Exception($"An unexpected error occured {error.Domain}");
}
}
else
{
try
{
NSError err;
var bookmark = downloadURL.CreateBookmarkData(default(NSUrlBookmarkCreationOptions), new string[] { asset.Stream.Name }, downloadURL.AbsoluteUrl, out err);
userDefaults.SetValueForKey(bookmark, new NSString(asset.Stream.Name));
}
catch (Exception ex)
{
Debug.WriteLine($"Failed to create bookmarkData for download URL: {ex.Message}");
}
userInfo[Asset.Keys.DownloadState] = AssetDownloadState.Downloaded.ToString();
userInfo[Asset.Keys.DownloadSelectionDisplayName] = string.Empty;
}
var userInfoDictionary = NSDictionary.FromObjectsAndKeys(userInfo.Values.ToArray(), userInfo.Keys.ToArray());
NSNotificationCenter.DefaultCenter.PostNotificationName(AssetPersistenceManager.AssetDownloadStateChanged, null, userInfoDictionary);
}
internal void CancelAssetDownload(Asset asset)
{
AVAggregateAssetDownloadTask task = activeDownloadsMap.Where(i => i.Value == asset).Select(i => i.Key).FirstOrDefault();
task?.Cancel();
}
