//----------------------------------------------------------------------------- // 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; } }