internal static IRenderer AddRenderer(IDvdGraphBuilder pDVDGraphBuilder,
IGraphBuilder pGraphBuilder,
Renderer preferredVideoRenderer,
IntPtr hMediaWindow)
{
// this methods will instruct DVDGraphBuilder to instantiate and use the preferred renderer; it will return a wrapper if it was successful
// it will return null if:
// a) preferredVideoRenderer is VR -> we can't instruct DVDGraphBuilder to create one so the program will have a possibility to fall back on the default one
// b) there were errors instantiating the preferred renderer; in this case the program should fall back on the default renderer by calling GetExistingRenderer
// after the graph is built
// it will throw an exception (originating from renderers' Initialize method) if initialization fails (similar behavior when adding renderers to non-DVD graphs)
RendererBase renderer = null;
try
{
if (preferredVideoRenderer != Renderer.VR)
{
renderer = GetRenderer(preferredVideoRenderer);
return(AddRenderer(pDVDGraphBuilder, pGraphBuilder, renderer, hMediaWindow));
}
return(null);
}
finally
{
if (renderer != null && !renderer._ready)
{
renderer.Close();
}
}
}
internal static IRenderer AddRenderer(IDvdGraphBuilder pDVDGraphBuilder,
IGraphBuilder pGraphBuilder,
RendererBase renderer,
IntPtr hMediaWindow)
{
// this methods will instruct DVDGraphBuilder to instantiate and use the specified renderer; it will return a wrapper if it was successful
// it will return null if there were errors instantiating the preferred renderer;
// in this case the program should fall back on the default renderer by calling GetExistingRenderer after the graph is built
// it will throw an exception (originating from renderers' Initialize method) if initialization fails (similar behavior when adding renderers to non-DVD graphs)
try
{
if (renderer.Instantiate(pDVDGraphBuilder, pGraphBuilder))
{
if (!renderer.IsDelayedInitialize)
{
renderer.Initialize(pGraphBuilder, hMediaWindow);
}
renderer.GraphBuilder = pGraphBuilder;
renderer.MediaWindowHandle = hMediaWindow;
renderer._ready = true;
return(renderer);
}
return(null);
}
finally
{
if (renderer != null && !renderer._ready)
{
renderer.Close();
}
}
}
internal static IRenderer AddRenderer(IGraphBuilder pGraphBuilder,
RendererBase renderer,
ThrowExceptionForHRPointer errorFunc,
IntPtr hMediaWindow,
bool fallBackOnVR)
{
try
{
bool bOk = renderer.InstantiateRenderer();
if (!bOk)
{
if (fallBackOnVR)
{
// try default renderer
renderer.Close();
renderer = GetRenderer(Renderer.VR);
renderer.InstantiateRenderer(); // it will throw FilterGraphBuilderException if it can't be instantiated
}
else
{
throw new FilterGraphBuilderException(GraphBuilderError.VideoRenderer);
}
}
renderer.AddToGraph(pGraphBuilder, errorFunc);
// Windowed renderers should be initialized (parent window is set, etc) _after_ the renderer is connected because a video window is created then
// On the contrary windowless renderes _must_ be initialized _before_ they are connected
if (!renderer.IsDelayedInitialize)
{
renderer.Initialize(pGraphBuilder, hMediaWindow);
}
renderer.GraphBuilder = pGraphBuilder;
renderer.MediaWindowHandle = hMediaWindow;
renderer._ready = true;
return(renderer);
}
finally
{
if (!renderer._ready)
{
renderer.Close();
}
}
}
internal static IRenderer SubstituteRenderer(IGraphBuilder pGraphBuilder, IntPtr hMediaWindow, Renderer desiredRenderer)
{
RendererBase existingRenderer = (RendererBase)GetExistingRenderer(pGraphBuilder, hMediaWindow);
// existingRenderer is either VR or VMR windowed (default mode for VMR); VMR9 and EVR are never default renderers
// VR and VMRWindowed need delayed initialization or it's ok to reconnect them before we call GetNativeVideoSize
// if desiredRenderer fails we will return the existing one
IRenderer renderer = existingRenderer;
if (existingRenderer.Renderer != desiredRenderer && desiredRenderer != Renderer.VR) // substitution with VR doesn't work well at least on Vista 64bit
{
RendererBase newRenderer = null;
try
{
newRenderer = (RendererBase)AddRenderer(pGraphBuilder,
desiredRenderer,
delegate(int hrCode, GraphBuilderError error) { },
hMediaWindow,
false);
IPin existingRendererInput, decoderOut;
if (existingRenderer.GetPins(out existingRendererInput, out decoderOut))
{
IPin newRendererInput = newRenderer.GetInputPin();
if (newRendererInput != null)
{
int hr = pGraphBuilder.Connect(decoderOut, newRendererInput);
if (DsHlp.SUCCEEDED(hr))
{
renderer = newRenderer;
newRenderer = null; // so that we don't close it (see finally)
Marshal.ReleaseComObject(existingRendererInput);
existingRendererInput = null;
existingRenderer.RemoveFromGraph();
}
else
{
hr = pGraphBuilder.Connect(decoderOut, existingRendererInput);
}
Marshal.ReleaseComObject(newRendererInput);
}
if (existingRendererInput != null)
{
Marshal.ReleaseComObject(existingRendererInput);
}
Marshal.ReleaseComObject(decoderOut);
}
}
catch // VR throws it if it can't be instantiated; also renderers will throw an expection if they can't be added to the graph
{ // we just ignore it here and return existingRenderer
}
finally
{
if (newRenderer != null)
{
newRenderer.Close();
}
}
}
return(renderer);
}
internal static IRenderer GetExistingRenderer(IGraphBuilder pGraphBuilder, IntPtr hMediaWindow)
{
// this method is to be called to create a wrapper for a renderer that is already in the graph (added by intelligent connect)
// at the momemnt it is assumed that this is a Windowed Renderer (compatability assumption)
RendererBase renderer = null;
try
{
IEnumFilters pEnum = null;
IBaseFilter pFilter;
int cFetched;
int hr = pGraphBuilder.EnumFilters(out pEnum);
if (DsHlp.SUCCEEDED(hr))
{
while (pEnum.Next(1, out pFilter, out cFetched) == DsHlp.S_OK)
{
Guid clsid;
if (pFilter.GetClassID(out clsid) == DsHlp.S_OK)
{
renderer = GetRenderer(clsid);
if (renderer != null)
{
renderer.BaseFilter = pFilter;
break;
}
else
{
Marshal.ReleaseComObject(pFilter);
}
}
else
{
Marshal.ReleaseComObject(pFilter);
}
}
Marshal.ReleaseComObject(pEnum);
}
if (renderer == null)
{
renderer = TryGetUnknownRenderer(pGraphBuilder); // last resort
}
if (renderer == null)
{
throw new FilterGraphBuilderException(GraphBuilderError.VideoRenderer); // we've tried hard enough, there is no point to continue
}
if (!renderer.IsDelayedInitialize)
{
renderer.Initialize(pGraphBuilder, hMediaWindow);
}
renderer.GraphBuilder = pGraphBuilder;
renderer.MediaWindowHandle = hMediaWindow;
renderer._ready = true;
return(renderer);
}
finally
{
if (renderer != null && !renderer._ready)
{
renderer.Close();
}
}
}