//-------------------------------------------------------------------
// DrawFrame
//
// Draw the video frame.
//-------------------------------------------------------------------
public int DrawFrame(IMFMediaBuffer pCaptureDeviceBuffer, bool snap, string snapFormat=null)
{
if (m_convertFn == null)
{
return MFError.MF_E_INVALIDREQUEST;
}
var hr = S_Ok;
Result res;
Surface pSurf;
if (pDevice == null || pSwapChain == null)
{
return S_Ok;
}
var r = new Rectangle(0, 0, width, height);
// Helper object to lock the video buffer.
using (var xbuffer = new VideoBufferLock(pCaptureDeviceBuffer))
{
IntPtr pbScanline0;
int lStride;
try
{
hr = TestCooperativeLevel();
if (Failed(hr))
throw new InvalidOperationException();
// 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(lDefaultStride, height, out pbScanline0, out lStride);
if (Failed(hr))
throw new InvalidOperationException();
}
catch (InvalidOperationException)
{
return hr;
}
// Get the swap-chain surface.
pSurf = pSwapChain.GetBackBuffer(0);
// Lock the swap-chain surface and get Graphic stream object.
try
{
DataRectangle dr;
if (offScreenSurface == null)
{
dr = pSurf.LockRectangle(LockFlags.NoSystemLock);
// Convert the frame. This also copies it to the Direct3D surface.
m_convertFn(dr.Data.DataPointer, dr.Pitch, pbScanline0, lStride, width, height);
}
else
{
var off = offScreenSurface.LockRectangle(LockFlags.NoSystemLock);
MFExtern.MFCopyImage(off.Data.DataPointer, off.Pitch, pbScanline0, lStride,
width * offScreenCoeffN / offScreenCoeffD, height);
offScreenSurface.UnlockRectangle();
pDevice.StretchRectangle(offScreenSurface, pSurf, TextureFilter.Linear);
dr = pSurf.LockRectangle(LockFlags.NoSystemLock);
}
if (snap)
ImageHelper.SnapShot(dr.Data.DataPointer, dr.Pitch, width, height, snapFormat);
}
finally
{
res = pSurf.UnlockRectangle();
MFError.ThrowExceptionForHR(res.Code);
}
}
// Color fill the back buffer.
var pBB = pDevice.GetBackBuffer(0, 0);
pDevice.ColorFill(pBB, DefaultBackColor);
// Blit the frame.
res = pDevice.StretchRectangle(pSurf, r, pBB, rcDest, TextureFilter.Linear);
hr = res.Code;
if (res.IsSuccess)
{
// Present the frame.
res = pDevice.Present();
hr = res.Code;
}
SafeRelease(pBB);
SafeRelease(pSurf);
return hr;
}
//-------------------------------------------------------------------
// DrawFrame
//
// Draw the video frame.
//-------------------------------------------------------------------
public int DrawFrame(IMFMediaBuffer pCaptureDeviceBuffer, bool snap, string snapFormat = null)
{
if (m_convertFn == null)
{
return(MFError.MF_E_INVALIDREQUEST);
}
var hr = S_Ok;
Result res;
Surface pSurf;
if (pDevice == null || pSwapChain == null)
{
return(S_Ok);
}
var r = new Rectangle(0, 0, width, height);
// Helper object to lock the video buffer.
using (var xbuffer = new VideoBufferLock(pCaptureDeviceBuffer))
{
IntPtr pbScanline0;
int lStride;
try
{
hr = TestCooperativeLevel();
if (Failed(hr))
{
throw new InvalidOperationException();
}
// 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(lDefaultStride, height, out pbScanline0, out lStride);
if (Failed(hr))
{
throw new InvalidOperationException();
}
}
catch (InvalidOperationException)
{
return(hr);
}
// Get the swap-chain surface.
pSurf = pSwapChain.GetBackBuffer(0);
// Lock the swap-chain surface and get Graphic stream object.
try
{
DataRectangle dr;
if (offScreenSurface == null)
{
dr = pSurf.LockRectangle(LockFlags.NoSystemLock);
// Convert the frame. This also copies it to the Direct3D surface.
m_convertFn(dr.Data.DataPointer, dr.Pitch, pbScanline0, lStride, width, height);
}
else
{
var off = offScreenSurface.LockRectangle(LockFlags.NoSystemLock);
MFExtern.MFCopyImage(off.Data.DataPointer, off.Pitch, pbScanline0, lStride,
width * offScreenCoeffN / offScreenCoeffD, height);
offScreenSurface.UnlockRectangle();
pDevice.StretchRectangle(offScreenSurface, pSurf, TextureFilter.Linear);
dr = pSurf.LockRectangle(LockFlags.NoSystemLock);
}
if (snap)
{
ImageHelper.SnapShot(dr.Data.DataPointer, dr.Pitch, width, height, snapFormat);
}
}
finally
{
res = pSurf.UnlockRectangle();
MFError.ThrowExceptionForHR(res.Code);
}
}
// Color fill the back buffer.
var pBB = pDevice.GetBackBuffer(0, 0);
pDevice.ColorFill(pBB, DefaultBackColor);
// Blit the frame.
res = pDevice.StretchRectangle(pSurf, r, pBB, rcDest, TextureFilter.Linear);
hr = res.Code;
if (res.IsSuccess)
{
// Present the frame.
res = pDevice.Present();
hr = res.Code;
}
SafeRelease(pBB);
SafeRelease(pSurf);
return(hr);
}