/// <summary>
/// Downloads a new chunk
/// </summary>
/// <param name="baseUrl">the base url of the file to download</param>
/// <param name="urlGenerator">the class that will generator the url for this chunk</param>
/// <param name="chunk">the chunk we are trying to download</param>
/// <param name="completeCallback">the event handler to call when we are complete</param>
/// <param name="instance">A unique id to group downloads. Can be used to group audio and video downloads separately</param>
public static void Start(
string baseUrl,
IUrlGenerator urlGenerator,
MediaChunk chunk,
EventHandler<DownloadCompleteEventArgs> completeCallback,
Guid instance)
{
Tracer.Assert(chunk.Bitrate > 0, String.Format(CultureInfo.InvariantCulture, "Cannot load chunk {0} with zero bitrate.", chunk.Sid));
Downloader downloader = new Downloader(baseUrl, urlGenerator, chunk, completeCallback, instance);
downloader.StartDownload();
}
/// <summary>
/// Fired when a download is complete
/// </summary>
/// <param name="sender">object that sent it to us</param>
/// <param name="args">download complete evet args</param>
private void ReportDownloadComplete(object sender, Downloader.DownloadCompleteEventArgs args)
{
MediaChunk chunk = args.Chunk;
try
{
if (chunk.State == MediaChunk.ChunkState.Error)
{
Tracer.Trace(TraceChannel.Error, "Media data chunk {0} ({2} kbps) was not loaded, chunk state is {1}.", chunk.Sid, chunk.State, chunk.Bitrate);
}
else if (chunk.State == MediaChunk.ChunkState.Loaded)
{
m_workQueue.Enqueue(new WorkQueueElement(WorkQueueElement.Command.ParseChunk, chunk));
m_manifestInfo.GetStreamInfoForStreamType(chunk.MediaType).Queue.UpdateBufferSizes();
}
// Send this message to our heuristics module
m_heuristics.OnDownloadCompleted(chunk.StreamId, chunk.ChunkId, chunk.Bitrate, chunk.DownloadStartTime, chunk.DownloadCompleteTime, chunk.Length);
// Fire our public chunk download event for anyone listening
if (MediaChunkDownloaded != null)
{
MediaChunkDownloaded(this, new MediaChunkDownloadedEventArgs(chunk.StreamId, chunk.ChunkId, chunk.Bitrate));
}
}
catch (AdaptiveStreamingException e)
{
RaiseError(e);
}
catch (Exception e)
{
RaiseError(e);
throw;
}
}
