//-----------------------------------------------------------------------------
// PresentSwapChain
//
// Presents a swap chain that contains a video frame.
//
// pSwapChain: Pointer to the swap chain.
// pSurface: Pointer to the swap chain's back buffer surface.
//
// Note: This method simply calls IDirect3DSwapChain9::Present, but a derived
// class could do something fancier.
//-----------------------------------------------------------------------------
protected void PresentSwapChain(IDirect3DSwapChain9 pSwapChain, IDirect3DSurface9 pSurface)
{
if (m_hwnd == IntPtr.Zero)
{
throw new COMException("D3DPresentEngine::PresentSwapChain", (int)HResult.MF_E_INVALIDREQUEST);
}
pSwapChain.Present(null, m_rcDestRect, m_hwnd, null, 0);
m_iFrames++;
}
//-----------------------------------------------------------------------------
// CreateD3DSample
//
// Creates an sample object (IMFSample) to hold a Direct3D swap chain.
//-----------------------------------------------------------------------------
protected void CreateD3DSample(IDirect3DSwapChain9 pSwapChain, out IMFSample ppVideoSample)
{
HResult hr;
IDirect3DSurface9 pSurface = null;
// Caller holds the object lock.
try
{
// Get the back buffer surface.
pSwapChain.GetBackBuffer(0, D3DBACKBUFFER_TYPE.Mono, out pSurface);
// Create the sample.
hr = MFExtern.MFCreateVideoSampleFromSurface(pSurface, out ppVideoSample);
MFError.ThrowExceptionForHR(hr);
}
finally
{
SafeRelease(pSurface); pSurface = null;
}
}
//-----------------------------------------------------------------------------
// PresentSample
//
// Presents a video frame.
//
// pSample: Pointer to the sample that contains the surface to present. If
// this parameter is NULL, the method paints a black rectangle.
// llTarget: Target presentation time.
//
// This method is called by the scheduler and/or the presenter.
//-----------------------------------------------------------------------------
public void PresentSample(IMFSample pSample, long llTarget)
{
HResult hr;
IMFMediaBuffer pBuffer = null;
IDirect3DSurface9 pSurface = null;
IDirect3DSwapChain9 pSwapChain = null;
object o;
try
{
if (pSample != null)
{
// Get the buffer from the sample.
hr = pSample.GetBufferByIndex(0, out pBuffer);
MFError.ThrowExceptionForHR(hr);
// Get the surface from the buffer.
hr = MFExtern.MFGetService(pBuffer, MFServices.MR_BUFFER_SERVICE, typeof(IDirect3DSurface9).GUID, out o);
MFError.ThrowExceptionForHR(hr);
pSurface = o as IDirect3DSurface9;
}
else if (m_pSurfaceRepaint != null)
{
// Redraw from the last surface.
pSurface = m_pSurfaceRepaint;
}
if (pSurface != null)
{
// Get the swap chain from the surface.
pSurface.GetContainer(typeof(IDirect3DSwapChain9).GUID, out o);
pSwapChain = o as IDirect3DSwapChain9;
// Present the swap chain.
PresentSwapChain(pSwapChain, pSurface);
// Store this pointer in case we need to repaint the surface.
if (m_pSurfaceRepaint != pSurface)
{
SafeRelease(m_pSurfaceRepaint);
m_pSurfaceRepaint = pSurface;
}
}
else
{
// No surface. All we can do is paint a black rectangle.
PaintFrameWithGDI();
}
}
catch (Exception e)
{
hr = (HResult)Marshal.GetHRForException(e);
if (hr == (HResult)D3DError.DeviceLost || hr == (HResult)D3DError.DeviceNotReset || hr == (HResult)D3DError.DeviceHung)
{
// We failed because the device was lost. Fill the destination rectangle.
PaintFrameWithGDI();
// Ignore. We need to reset or re-create the device, but this method
// is probably being called from the scheduler thread, which is not the
// same thread that created the device. The Reset(Ex) method must be
// called from the thread that created the device.
// The presenter will detect the state when it calls CheckDeviceState()
// on the next sample.
}
}
finally
{
SafeRelease(pSwapChain); pSwapChain = null;
//SafeRelease(pSurface); pSurface = null;
SafeRelease(pBuffer); pBuffer = null;
}
}
//-----------------------------------------------------------------------------
// 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);
}
}
}
//-----------------------------------------------------------------------------
// PresentSwapChain
//
// Presents a swap chain that contains a video frame.
//
// pSwapChain: Pointer to the swap chain.
// pSurface: Pointer to the swap chain's back buffer surface.
//
// Note: This method simply calls IDirect3DSwapChain9::Present, but a derived
// class could do something fancier.
//-----------------------------------------------------------------------------
protected void PresentSwapChain(IDirect3DSwapChain9 pSwapChain, IDirect3DSurface9 pSurface)
{
if (m_hwnd == IntPtr.Zero)
{
throw new COMException("D3DPresentEngine::PresentSwapChain", MFError.MF_E_INVALIDREQUEST);
}
pSwapChain.Present(null, m_rcDestRect, m_hwnd, null, 0);
m_iFrames++;
}
//-----------------------------------------------------------------------------
// CreateD3DSample
//
// Creates an sample object (IMFSample) to hold a Direct3D swap chain.
//-----------------------------------------------------------------------------
protected void CreateD3DSample(IDirect3DSwapChain9 pSwapChain, out IMFSample ppVideoSample)
{
int hr;
IDirect3DSurface9 pSurface = null;
// Caller holds the object lock.
try
{
// Get the back buffer surface.
pSwapChain.GetBackBuffer(0, D3DBACKBUFFER_TYPE.Mono, out pSurface);
// Create the sample.
hr = MFExtern.MFCreateVideoSampleFromSurface(pSurface, out ppVideoSample);
MFError.ThrowExceptionForHR(hr);
}
finally
{
SafeRelease(pSurface); pSurface = null;
}
}
