//-------------------------------------------------------------------
// DrawFrame
//
// Draw the video frame.
//-------------------------------------------------------------------
public HResult DrawFrame(IMFMediaBuffer pCaptureDeviceBuffer)
{
if (m_convertFn == null)
{
return(HResult.MF_E_INVALIDREQUEST);
}
HResult hr = HResult.S_OK;
IntPtr pbScanline0;
int lStride = 0;
Result res;
Surface pSurf = null;
Surface pBB = null;
if (m_pDevice == null || m_pSwapChain == null)
{
return(HResult.S_OK);
}
// Helper object to lock the video buffer.
using (VideoBufferLock xbuffer = new VideoBufferLock(pCaptureDeviceBuffer))
{
hr = TestCooperativeLevel();
if (Failed(hr))
{
goto done;
}
// Lock the video buffer. This method returns a pointer to the first scan
// line in the image, and the stride in bytes.
hr = xbuffer.LockBuffer(m_lDefaultStride, m_height, out pbScanline0, out lStride);
if (Failed(hr))
{
goto done;
}
// Get the swap-chain surface.
pSurf = m_pSwapChain.GetBackBuffer(0);
// Lock the swap-chain surface and get Graphic stream object.
DataRectangle dr = pSurf.LockRectangle(LockFlags.NoSystemLock);
try
{
using (dr.Data)
{
// Convert the frame. This also copies it to the Direct3D surface.
m_convertFn(dr.Data.DataPointer, dr.Pitch, pbScanline0, lStride, m_width, m_height);
}
}
finally
{
res = pSurf.UnlockRectangle();
MFError.ThrowExceptionForHR(res.Code);
}
}
// Color fill the back buffer.
pBB = m_pDevice.GetBackBuffer(0, 0);
m_pDevice.ColorFill(pBB, Color.FromArgb(0, 0, 0x80));
// Blit the frame.
Rectangle r = new Rectangle(0, 0, m_width, m_height);
res = m_pDevice.StretchRectangle(pSurf, r, pBB, m_rcDest, TextureFilter.Linear);
hr = (HResult)res.Code;
if (res.IsSuccess)
{
// Present the frame.
res = m_pDevice.Present();
hr = (HResult)res.Code;
}
done:
SafeRelease(pBB);
SafeRelease(pSurf);
return(hr);
}
//-------------------------------------------------------------------
// DrawFrame
//
// Draw the video frame.
//-------------------------------------------------------------------
public int DrawFrame(IMFMediaBuffer pCaptureDeviceBuffer)
{
if (m_convertFn == null)
{
return MFError.MF_E_INVALIDREQUEST;
}
int hr = S_Ok;
IntPtr pbScanline0;
int lStride = 0;
Result res;
Surface pSurf = null;
Surface pBB = null;
if (m_pDevice == null || m_pSwapChain == null)
{
return S_Ok;
}
// Helper object to lock the video buffer.
using (VideoBufferLock xbuffer = new VideoBufferLock(pCaptureDeviceBuffer))
{
hr = TestCooperativeLevel();
if (Failed(hr)) { goto done; }
// Lock the video buffer. This method returns a pointer to the first scan
// line in the image, and the stride in bytes.
hr = xbuffer.LockBuffer(m_lDefaultStride, m_height, out pbScanline0, out lStride);
if (Failed(hr)) { goto done; }
// Get the swap-chain surface.
pSurf = m_pSwapChain.GetBackBuffer(0);
// Lock the swap-chain surface and get Graphic stream object.
DataRectangle dr = pSurf.LockRectangle(LockFlags.NoSystemLock);
try
{
using (dr.Data)
{
// Convert the frame. This also copies it to the Direct3D surface.
m_convertFn(dr.Data.DataPointer, dr.Pitch, pbScanline0, lStride, m_width, m_height);
}
}
finally
{
res = pSurf.UnlockRectangle();
MFError.ThrowExceptionForHR(res.Code);
}
}
// Color fill the back buffer.
pBB = m_pDevice.GetBackBuffer(0, 0);
m_pDevice.ColorFill(pBB, Color.FromArgb(0, 0, 0x80));
// Blit the frame.
Rectangle r = new Rectangle(0, 0, m_width, m_height);
res = m_pDevice.StretchRectangle(pSurf, r, pBB, m_rcDest, TextureFilter.Linear);
hr = res.Code;
if (res.IsSuccess)
{
// Present the frame.
res = m_pDevice.Present();
hr = res.Code;
}
done:
SafeRelease(pBB);
SafeRelease(pSurf);
return hr;
}