protected void ClearDesiredSampleTime(IMFSample pSample)
{
if (pSample == null)
{
throw new COMException("ClearDesiredSampleTime", E_Pointer);
}
IMFDesiredSample pDesired = null;
object pUnkSwapChain = null;
// We store some custom attributes on the sample, so we need to cache them
// and reset them.
//
// This works around the fact that IMFDesiredSample::Clear() removes all of the
// attributes from the sample.
int counter;
int hr;
hr = pSample.GetUINT32(MFSamplePresenter_SampleCounter, out counter);
MFError.ThrowExceptionForHR(hr);
try
{
Guid IID_IUnknown = new Guid("00000000-0000-0000-C000-000000000046");
hr = pSample.GetUnknown(MFSamplePresenter_SampleSwapChain, IID_IUnknown, out pUnkSwapChain);
MFError.ThrowExceptionForHR(hr);
}
catch { }
pDesired = (IMFDesiredSample)pSample;
pDesired.Clear();
hr = pSample.SetUINT32(MFSamplePresenter_SampleCounter, counter);
MFError.ThrowExceptionForHR(hr);
if (pUnkSwapChain != null)
{
hr = pSample.SetUnknown(MFSamplePresenter_SampleSwapChain, pUnkSwapChain);
MFError.ThrowExceptionForHR(hr);
}
SafeRelease(pUnkSwapChain);
//SafeRelease(pDesired);
}
//-----------------------------------------------------------------------------
// CreateVideoSamples
//
// Creates video samples based on a specified media type.
//
// pFormat: Media type that describes the video format.
// videoSampleQueue: List that will contain the video samples.
//
// Note: For each video sample, the method creates a swap chain with a
// single back buffer. The video sample object holds a pointer to the swap
// chain's back buffer surface. The mixer renders to this surface, and the
// D3DPresentEngine renders the video frame by presenting the swap chain.
//-----------------------------------------------------------------------------
public void CreateVideoSamples(
IMFMediaType pFormat,
Queue <IMFSample> videoSampleQueue
)
{
if (m_hwnd == IntPtr.Zero)
{
throw new COMException("D3DPresentEngine::CreateVideoSamples", (int)HResult.MF_E_INVALIDREQUEST);
}
if (pFormat == null)
{
throw new COMException("D3DPresentEngine::CreateVideoSamples", (int)HResult.MF_E_UNEXPECTED);
}
HResult hr;
D3DPRESENT_PARAMETERS pp;
IDirect3DSwapChain9 pSwapChain = null; // Swap chain
IMFSample pVideoSample = null; // Sampl
lock (this)
{
ReleaseResources();
try
{
// Get the swap chain parameters from the media type.
GetSwapChainPresentParameters(pFormat, out pp);
UpdateDestRect();
// Create the video samples.
for (int i = 0; i < PRESENTER_BUFFER_COUNT; i++)
{
// Create a new swap chain.
m_pDevice.CreateAdditionalSwapChain(pp, out pSwapChain);
// Create the video sample from the swap chain.
CreateD3DSample(pSwapChain, out pVideoSample);
// Add it to the list.
videoSampleQueue.Enqueue(pVideoSample);
// Set the swap chain pointer as a custom attribute on the sample. This keeps
// a reference count on the swap chain, so that the swap chain is kept alive
// for the duration of the sample's lifetime.
hr = pVideoSample.SetUnknown(EVRCustomPresenter.MFSamplePresenter_SampleSwapChain, pSwapChain);
MFError.ThrowExceptionForHR(hr);
//SafeRelease(pVideoSample);
SafeRelease(pSwapChain); pSwapChain = null;
}
}
catch
{
ReleaseResources();
}
finally
{
SafeRelease(pSwapChain); pSwapChain = null;
//SafeRelease(pVideoSample);
}
}
}
