protected override async Task EnsureHasDuration(MusicItem track)
{
var uri = await LocalLibrary.LocalUriIfExists(track);
if (uri != null)
{
track.Duration = await StoreBeamPlayer.MediaElement.UriDuration(uri);
}
}
private async Task DownloadIfNecessary(MusicItem track)
{
var maybeLocalUri = await LocalLibrary.LocalUriIfExists(track);
if (maybeLocalUri == null)
{
await BackgroundDownloader.DownloadAsync(track);
}
}
//private async Task<Uri> DownloadIfNotExists(MusicItem track, Func<Task<Uri>> performDownload) {
// var maybeLocalUri = await LocalLibrary.LocalUriIfExists(track);
// if(maybeLocalUri != null) {
// return maybeLocalUri;
// }
// return await performDownload();
//}
/// <summary>
/// Prepares a download. A return value of null indicates that the download shall
/// not proceed. This may be the case if the track already exists locally, or some
/// IO error prevents the download, for example if the intended destination path
/// is too long.
/// </summary>
/// <param name="track"></param>
/// <returns>download parameters, or null if the track shall not be downloaded</returns>
private async Task <DownloadParameters> GetDownloadInfo(MusicItem track)
{
var maybeLocalUri = await LocalLibrary.LocalUriIfExists(track);
if (maybeLocalUri == null)
{
try {
var source = RemoveCredentialsFromQueryParams(track.Source);
var destFile = await Utils.FileTo(PathTo(track));
return(new DownloadParameters(source, destFile));
} catch (IOException) {
// may have thrown PathTooLongException
// does not proceed with the download
return(null);
}
}
else
{
return(null);
}
}
