private void BuildGraph(string sFileName, out IFilterGraph2 graphBuilder, out IBaseFilter audioFilter)
{
int hr = 0;
IBaseFilter sourceFilter = null;
IPin pinOut = null;
graphBuilder = new FilterGraph() as IFilterGraph2;
audioFilter = null;
try
{
hr = graphBuilder.AddSourceFilter(sFileName, sFileName, out sourceFilter);
Marshal.ThrowExceptionForHR(hr);
audioFilter = (IBaseFilter) new DSoundRender();
hr = graphBuilder.AddFilter(audioFilter, "DirectSound Renderer");
pinOut = DsFindPin.ByDirection(sourceFilter, PinDirection.Output, 0);
hr = graphBuilder.RenderEx(pinOut, AMRenderExFlags.RenderToExistingRenderers, IntPtr.Zero);
Marshal.ThrowExceptionForHR(hr);
}
catch
{
Marshal.ReleaseComObject(graphBuilder);
throw;
}
finally
{
Marshal.ReleaseComObject(sourceFilter);
Marshal.ReleaseComObject(pinOut);
}
}
private void ConnectGraph(ref IFilterGraph2 graphBuilder, ref IBaseFilter sourceFilter, ref IBaseFilter vmr9Filter)
{
int hr = 0;
IPin pinOut = null;
try
{
pinOut = DsFindPin.ByDirection(sourceFilter, PinDirection.Output, 0);
hr = graphBuilder.RenderEx(pinOut, AMRenderExFlags.RenderToExistingRenderers, IntPtr.Zero);
Marshal.ThrowExceptionForHR(hr);
}
finally
{
Marshal.ReleaseComObject(pinOut);
}
}