IDvdGraphBuilder GetDvdGraph()
{
int hr;
DvdGraphBuilder dgb = null;
IGraphBuilder gb = null;
AMDvdRenderStatus drs;
IDvdGraphBuilder idgb = null;
// Get a dvd graph object
dgb = new DvdGraphBuilder();
Debug.Assert(dgb != null, "new DvdGraphBuilder");
// Get the IDvdGraphBuilder interface
idgb = dgb as IDvdGraphBuilder;
hr = idgb.RenderDvdVideoVolume(MyDisk, AMDvdGraphFlags.HWDecPrefer, out drs);
DsError.ThrowExceptionForHR(hr);
// If there is no dvd in the player, you get hr == S_FALSE (1)
Debug.Assert(hr == 0, "Can't find dvd");
// Get an IFilterGraph interface
hr = idgb.GetFiltergraph(out gb);
DsError.ThrowExceptionForHR(hr);
Debug.Assert(gb != null, "GetFiltergraph");
m_ROT = new DsROTEntry(gb);
m_imc = gb as IMediaControl;
m_mediaEvent = gb as IMediaEventEx;
return(idgb);
}
public void DoTests()
{
int hr;
DvdGraphBuilder dgb = null;
IDvdGraphBuilder idgb = null;
IGraphBuilder gb = null;
IBasicAudio iba = null;
AMDvdRenderStatus drs;
object obj;
// Get a dvd graph object
dgb = new DvdGraphBuilder();
Debug.Assert(dgb != null, "new DvdGraphBuilder");
try
{
// Get the IDvdGraphBuilder interface
idgb = dgb as IDvdGraphBuilder;
// Test RenderDvdVideoVolume
hr = idgb.RenderDvdVideoVolume(null, AMDvdGraphFlags.HWDecPrefer, out drs);
Marshal.ThrowExceptionForHR(hr);
// If there is no dvd in the player, you get hr == S_FALSE (1)
Debug.Assert(hr == 0 || (hr == 1 && drs.bDvdVolUnknown), "RenderDvdVideoVolume");
// Get an IFilterGraph interface
hr = idgb.GetFiltergraph(out gb);
Marshal.ThrowExceptionForHR(hr);
Debug.Assert(gb != null, "GetFiltergraph");
// GetDvdInterface allows for retrieving one of a variety
// of interfaces. Try getting an IBasicAudio.
hr = idgb.GetDvdInterface(typeof(IBasicAudio).GUID, out obj);
Marshal.ThrowExceptionForHR(hr);
// See if it is an IBasicAudio
iba = obj as IBasicAudio;
obj = null;
Debug.Assert(iba != null);
}
finally
{
// Release everything
if (dgb != null)
{
Marshal.ReleaseComObject(dgb);
dgb = null;
}
if (gb != null)
{
Marshal.ReleaseComObject(gb);
gb = null;
}
if (iba != null)
{
Marshal.ReleaseComObject(iba);
iba = null;
}
}
}
