public int Request(IMediaSample pSample, IntPtr dwUser)
{
int hr;
Debug.Write(string.Format("Request {0} user: {1}", pSample != null, dwUser));
MediaHolder mh = new MediaHolder(pSample, dwUser);
lock (this) // Protect the m_ variables
{
if (!m_GraphIsFlushing)
{
// Now that we have populated everything, wait for the splitter to call the
// WaitForNext() method to retrieve the data
m_Requests.Enqueue(mh);
// Let the waiting thread in WaitForNext know something is ready for
// processing
m_Wait.Set();
hr = S_Ok;
}
else
{
hr = DsResults.E_WrongState;
}
}
Debug.WriteLine(hr.ToString());
return(hr);
}
public int WaitForNext(int dwTimeout, out IMediaSample ppSample, out IntPtr pdwUser)
{
int hr;
Debug.WriteLine(string.Format("WaitForNext {0}", dwTimeout));
// In case something goes wrong
ppSample = null;
pdwUser = IntPtr.Zero;
if (!m_GraphIsFlushing)
{
// Count threads we have waiting
Interlocked.Increment(ref m_ThreadsWaiting);
bool bWait = m_Wait.WaitOne(dwTimeout, false);
lock (this)
{
// If we found one before timing out, send it back
if (bWait && !m_GraphIsFlushing)
{
MediaHolder mh = m_Requests.Dequeue() as MediaHolder;
ppSample = mh.Sample;
pdwUser = mh.User;
hr = PopulateMediaSample(ppSample);
}
else
{
hr = DsResults.E_Timeout;
}
// If there is another request, reset the event. Also
// if the graph is flushing, allow the other threads
// to exit
if ((m_Requests.Count > 0) || (m_GraphIsFlushing))
{
m_Wait.Set();
}
}
// Count threads we have waiting
Interlocked.Decrement(ref m_ThreadsWaiting);
}
else
{
hr = DsResults.E_WrongState;
}
return(hr);
}