// This is the completion part of the async callback invoked
// in DoRead to process a new meta entry.
static private void CallbackMethod(IAsyncResult ar)
{
// Retrieve the delegate.
AsyncResult result = (AsyncResult)ar;
LoadValuesCaller caller = (LoadValuesCaller)result.AsyncDelegate;
// Call EndInvoke to end the call.
caller.EndInvoke(ar);
}
public IcyScheme(string sUrl)
{
m_Position = 0;
m_SinceLast = 0;
m_bShutdown = false;
m_uri = new Uri(sUrl);
m_ConnectEvent = new ManualResetEvent(false);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(m_uri);
ServicePoint point = request.ServicePoint;
point.ReceiveBufferSize = DefaultReceiveBufferSize * 2;
request.UserAgent = "NSPlayer/12.00.7601.23471";
request.Headers.Add("Icy-Metadata:1");
bool OldUnsafe, UseOldUnsafe;
UseOldUnsafe = AllowUnsafeHeaderParsing(true, out OldUnsafe);
// Parts of BeginGetResponse are still done synchronously,
// so we do it this way.
Task.Factory.FromAsync <WebResponse>(request.BeginGetResponse,
request.EndGetResponse,
null)
.ContinueWith(task =>
{
if (UseOldUnsafe)
{
AllowUnsafeHeaderParsing(OldUnsafe, out OldUnsafe);
}
if (task.Status == TaskStatus.RanToCompletion)
{
try
{
WebResponse wr = task.Result;
// Turn the headers into metadata, plus store them as an
// IMFAttribute
LoadResponseHeaders(wr.Headers);
// The only part of the HttpWebRequest that we keep.
m_ResponseStream = wr.GetResponseStream();
// In order to (pretend to) support seeking, we save off a block
// of data. Any seeks to the first DefaultReceiveBufferSize bytes
// are resolved from this data.
m_PositionReal = long.MaxValue;
m_FirstBlock = new byte[DefaultReceiveBufferSize];
WaitRead(m_FirstBlock, 0, DefaultReceiveBufferSize);
m_PositionReal = 0;
// Used to tell WaitForConnect that the connection is complete.
m_ConnectEvent.Set();
}
catch
{
Dispose();
}
}
else
{
Dispose();
}
});
// While we are waiting for the connect/cache to complete, finish
// the constructor.
m_MetaData = new MetaDataContainer();
MFError hrthrowonerror = MFExtern.MFCreateEventQueue(out m_events);
m_FixNames = new Dictionary <string, string>(13);
// Note that the keys are (intentionally) all lower case.
m_FixNames["icy-name"] = "WM/RadioStationName";
m_FixNames["x-audiocast-name"] = "WM/RadioStationName";
m_FixNames["icy-genre"] = "WM/Genre";
m_FixNames["x-audiocast-genre"] = "WM/Genre";
m_FixNames["icy-url"] = "WM/PromotionURL";
m_FixNames["x-audiocast-url"] = "WM/PromotionURL";
m_FixNames["x-audiocast-description"] = "Description";
m_FixNames["x-audiocast-artist"] = "Author";
m_FixNames["x-audiocast-album"] = "WM/AlbumTitle";
m_FixNames["x-audiocast-br"] = "BitRate";
m_FixNames["icy-br"] = "BitRate";
m_FixNames["streamtitle"] = "Title";
m_FixNames["streamurl"] = "WM/AudioFileURL";
hrthrowonerror = SetString(
MFAttributesClsid.MF_BYTESTREAM_EFFECTIVE_URL,
m_uri.AbsoluteUri);
// Use this to make async calls to handle meta data.
m_caller = new LoadValuesCaller(LoadValues);
}
