// Formats
protected void CreateOptimalVideoType(IMFMediaType pProposed, out IMFMediaType ppOptimal)
{
try
{
MFRect rcOutput;
MFVideoArea displayArea;
IMFMediaType pOptimalType = null;
// Create the helper object to manipulate the optimal type.
VideoTypeBuilder pmtOptimal = new VideoTypeBuilder();
// Clone the proposed type.
pmtOptimal.CopyFrom(pProposed);
// Modify the new type.
// For purposes of this SDK sample, we assume
// 1) The monitor's pixels are square.
// 2) The presenter always preserves the pixel aspect ratio.
// Set the pixel aspect ratio (PAR) to 1:1 (see assumption #1, above)
pmtOptimal.SetPixelAspectRatio(1, 1);
// Get the output rectangle.
rcOutput = m_pD3DPresentEngine.GetDestinationRect();
if (rcOutput.IsEmpty())
{
// Calculate the output rectangle based on the media type.
CalculateOutputRectangle(pProposed, out rcOutput);
}
// Set the extended color information: Use BT.709
pmtOptimal.SetYUVMatrix(MFVideoTransferMatrix.BT709);
pmtOptimal.SetTransferFunction(MFVideoTransferFunction.Func709);
pmtOptimal.SetVideoPrimaries(MFVideoPrimaries.BT709);
pmtOptimal.SetVideoNominalRange(MFNominalRange.MFNominalRange_16_235);
pmtOptimal.SetVideoLighting(MFVideoLighting.Dim);
// Set the target rect dimensions.
pmtOptimal.SetFrameDimensions(rcOutput.right, rcOutput.bottom);
// Set the geometric aperture, and disable pan/scan.
displayArea = new MFVideoArea(0, 0, rcOutput.right, rcOutput.bottom);
pmtOptimal.SetPanScanEnabled(false);
pmtOptimal.SetGeometricAperture(displayArea);
// Set the pan/scan aperture and the minimum display aperture. We don't care
// about them per se, but the mixer will reject the type if these exceed the
// frame dimentions.
pmtOptimal.SetPanScanAperture(displayArea);
pmtOptimal.SetMinDisplayAperture(displayArea);
// Return the pointer to the caller.
pmtOptimal.GetMediaType(out pOptimalType);
pmtOptimal.Dispose();
ppOptimal = pOptimalType;
}
finally
{
//SafeRelease(pOptimalType);
//SafeRelease(pmtOptimal);
}
}
protected void IsMediaTypeSupported(IMFMediaType pMediaType)
{
VideoTypeBuilder pProposed = null;
bool bCompressed = false;
MFVideoInterlaceMode InterlaceMode = MFVideoInterlaceMode.Unknown;
MFVideoArea VideoCropArea;
int width = 0, height = 0;
try
{
// Helper object for reading the proposed type.
pProposed = new VideoTypeBuilder(pMediaType);
// Reject compressed media types.
pProposed.IsCompressedFormat(out bCompressed);
if (bCompressed)
{
throw new COMException("Compressed formats not supported", MFError.MF_E_INVALIDMEDIATYPE);
}
// Validate the format.
int i;
pProposed.GetFourCC(out i);
// The D3DPresentEngine checks whether the format can be used as
// the back-buffer format for the swap chains.
m_pD3DPresentEngine.CheckFormat(i);
// Reject interlaced formats.
pProposed.GetInterlaceMode(out InterlaceMode);
if (InterlaceMode != MFVideoInterlaceMode.Progressive)
{
throw new COMException("Interlaced formats not supported", MFError.MF_E_INVALIDMEDIATYPE);
}
pProposed.GetFrameDimensions(out width, out height);
// Validate the various apertures (cropping regions) against the frame size.
// Any of these apertures may be unspecified in the media type, in which case
// we ignore it. We just want to reject invalid apertures.
try
{
pProposed.GetPanScanAperture(out VideoCropArea);
ValidateVideoArea(VideoCropArea, width, height);
}
catch { }
try
{
pProposed.GetGeometricAperture(out VideoCropArea);
ValidateVideoArea(VideoCropArea, width, height);
}
catch { }
try
{
pProposed.GetMinDisplayAperture(out VideoCropArea);
ValidateVideoArea(VideoCropArea, width, height);
}
catch { }
}
finally
{
pProposed.Dispose();
//SafeRelease(pMediaType);
}
}
protected void CalculateOutputRectangle(IMFMediaType pProposed, out MFRect prcOutput)
{
int srcWidth = 0, srcHeight = 0;
MFRatio inputPAR;
MFRatio outputPAR;
MFRect rcOutput = new MFRect();
MFVideoArea displayArea;
VideoTypeBuilder pmtProposed = null;
// Helper object to read the media type.
pmtProposed = new VideoTypeBuilder(pProposed);
// Get the source's frame dimensions.
pmtProposed.GetFrameDimensions(out srcWidth, out srcHeight);
// Get the source's display area.
pmtProposed.GetVideoDisplayArea(out displayArea);
// Calculate the x,y offsets of the display area.
int offsetX = (int)displayArea.OffsetX.GetOffset();
int offsetY = (int)displayArea.OffsetY.GetOffset();
// Use the display area if valid. Otherwise, use the entire frame.
if (displayArea.Area.Width != 0 &&
displayArea.Area.Height != 0 &&
offsetX + displayArea.Area.Width <= (srcWidth) &&
offsetY + displayArea.Area.Height <= (srcHeight))
{
rcOutput.left = offsetX;
rcOutput.right = offsetX + displayArea.Area.Width;
rcOutput.top = offsetY;
rcOutput.bottom = offsetY + displayArea.Area.Height;
}
else
{
rcOutput.left = 0;
rcOutput.top = 0;
rcOutput.right = srcWidth;
rcOutput.bottom = srcHeight;
}
// rcOutput is now either a sub-rectangle of the video frame, or the entire frame.
// If the pixel aspect ratio of the proposed media type is different from the monitor's,
// letterbox the video. We stretch the image rather than shrink it.
inputPAR = pmtProposed.GetPixelAspectRatio(); // Defaults to 1:1
outputPAR.Denominator = outputPAR.Numerator = 1; // This is an assumption of the sample.
// Adjust to get the correct picture aspect ratio.
prcOutput = CorrectAspectRatio(rcOutput, inputPAR, outputPAR);
pmtProposed.Dispose();
}