private async Task <WebRequestorResponse> GetChunkAsync(Uri source, CancellationToken c)
{
if (ChunkLookup != null && ChunkLookup.Any())
{
var key = source.AbsolutePath;
if (ChunkLookup.ContainsKey(key))
{
ChunkLocation chunkLocation = ChunkLookup[key];
if (ChunkRequested != null)
{
ChunkRequested(this, new ChunkRequestedEventArgs(source, chunkLocation.Uri, string.Format("{0}-{1}", chunkLocation.From, chunkLocation.To)));
}
return(await DownloadResolvedChunkAsync(source, chunkLocation, c));
}
}
if (ChunkRequested != null)
{
ChunkRequested(this, new ChunkRequestedEventArgs(source, source, null));
}
#if SILVERLIGHT // SILVERLIGHT requires that we download the chunk
return(await WebRequestor.GetResponseAsync(source));
#else
return(null);
#endif
}
private async Task <WebRequestorResponse> DownloadManifestAsync(Uri source, CancellationToken c)
{
// download and convert the manifest
var response = await WebRequestor.GetResponseAsync(source);
c.ThrowIfCancellationRequested();
// convert the DASH stream to Smooth Streaming format
XDocument sourceXml = XDocument.Load(response.Stream);
Stream destStream;
switch (sourceXml.Root.Name.LocalName)
{
case "SmoothStreamingMedia":
destStream = response.Stream;
break;
case "MPD":
response.Stream.Dispose(); // we don't need it anymore
var conversionResult = await DashManifestConverter.ConvertToSmoothManifest(sourceXml, source);
destStream = conversionResult.Manifest.ToStream();
ChunkLookup = conversionResult.ChunkLookup;
break;
default:
throw new NotImplementedException();
}
if (ManifestRequested != null)
{
var destXml = new StreamReader(destStream).ReadToEnd();
ManifestRequested(this, new ManifestRequestedEventArgs(source, sourceXml.ToString(), destXml));
}
destStream.Seek(0, SeekOrigin.Begin);
response.Stream = destStream;
return(response);
}
private static async Task <WebRequestorResponse> DownloadFragment(Uri uri, long offset, long size)
{
return(await WebRequestor.GetResponseAsync(uri, offset, offset + size - 1));
}
private static async Task <WebRequestorResponse> DownloadResolvedChunkAsync(Uri source, ChunkLocation chunkLocation, CancellationToken c)
{
// download the chunk and keep the stream open
return(await WebRequestor.GetResponseAsync(chunkLocation.Uri, (long)chunkLocation.From, (long)chunkLocation.To));
}