private async Task StartDownloadAsync(DownloadItem downloadInfo)
{
downloadInfo.Status = DownloadStatus.Initializing;
// Query the download URL for the right file.
string VideoId = null;
Video VInfo = null;
MediaStreamInfoSet VStream = null;
if (YoutubeClient.TryParseVideoId(downloadInfo.Url, out VideoId))
{
try {
var T1 = youtube.GetVideoAsync(VideoId);
var T2 = youtube.GetVideoMediaStreamInfosAsync(VideoId);
await Task.WhenAll(new Task[] { T1, T2 });
VInfo = T1.Result;
VStream = T2.Result;
}
catch {
}
}
if (VStream == null)
{
downloadInfo.Status = DownloadStatus.Failed;
RaiseCallback(downloadInfo);
return;
}
// Get the highest resolution format.
BestFormatInfo BestFile = DownloadManager.SelectBestFormat(VStream, downloadInfo.Options ?? Options);
BestFile.Duration = VInfo.Duration;
if (BestFile.BestVideo != null && (downloadInfo.Action == DownloadAction.Download || downloadInfo.Action == DownloadAction.DownloadVideo))
{
downloadInfo.Files.Add(new FileProgress()
{
Type = StreamType.Video,
Url = BestFile.BestVideo.Url,
Destination = downloadInfo.DestinationNoExt + GetVideoExtension(DownloadManager.GetVideoEncoding(BestFile.BestVideo)),
Stream = BestFile.BestVideo,
BytesTotal = BestFile.BestVideo.Size
});
}
if (BestFile.BestAudio != null && (downloadInfo.Action == DownloadAction.Download || downloadInfo.Action == DownloadAction.DownloadAudio))
{
downloadInfo.Files.Add(new FileProgress()
{
Type = StreamType.Audio,
Url = BestFile.BestAudio.Url,
Destination = downloadInfo.DestinationNoExt + GetAudioExtension(BestFile.BestAudio.AudioEncoding),
Stream = BestFile.BestAudio,
BytesTotal = BestFile.BestAudio.Size
});
}
// Add extension if Destination doesn't already include it.
string Ext = DownloadManager.GetFinalExtension(BestFile.BestVideo, BestFile.BestAudio);
if (!downloadInfo.Destination.ToLower().EndsWith(Ext))
{
downloadInfo.Destination += Ext;
}
await DownloadFilesAsync(downloadInfo).ConfigureAwait(false);
}
