override protected void OnProcessSample(IMFSample pInputSample, bool Discontinuity, int InputMessageNumber)
{
MFError throwonhr;
IMFMediaBuffer pInput;
// While we accept types that *might* be interlaced, if we actually receive
// an interlaced sample, reject it.
if (m_MightBeInterlaced)
{
int ix;
// Returns a bool: true = interlaced, false = progressive
throwonhr = pInputSample.GetUINT32(MFAttributesClsid.MFSampleExtension_Interlaced, out ix);
if (ix != 0)
{
SafeRelease(pInputSample);
return;
}
}
// Set the Discontinuity flag on the sample that's going to OutputSample.
HandleDiscontinuity(Discontinuity, pInputSample);
int i = MFExtern.MFGetAttributeUINT32(Attributes, ClsidRotate, 0);
bool IsOdd = (i & 1) == 1;
// Does the specified rotation give a different orientation than
// the old one?
if (IsOdd != m_WasOdd)
{
// Yes, change the output type.
OutputSample(null, InputMessageNumber);
m_WasOdd = IsOdd;
}
// Get the data buffer from the input sample. If the sample has
// multiple buffers, you might be able to get (slightly) better
// performance processing each buffer in turn rather than forcing
// a new, full-sized buffer to get created.
throwonhr = pInputSample.ConvertToContiguousBuffer(out pInput);
try
{
// Process it.
DoWork(pInput, (RotateFlipType)i);
// Send the modified input sample to the output sample queue.
OutputSample(pInputSample, InputMessageNumber);
}
finally
{
// If (somewhere) there is .Net code that is holding on to an instance of
// the same buffer as pInput, this will yank the RCW out from underneath
// it, probably causing it to crash. But if we don't release it, our memory
// usage explodes.
SafeRelease(pInput);
}
}
protected override void OnProcessSample(IMFSample pInputSample, bool Discontinuity, int InputMessageNumber)
{
MFError throwonhr;
// While we accept types that *might* be interlaced, if we actually receive
// an interlaced sample, reject it.
if (m_MightBeInterlaced)
{
int ix;
// Returns a bool: true = interlaced, false = progressive
HResult hr = pInputSample.GetUINT32(MFAttributesClsid.MFSampleExtension_Interlaced, out ix);
// Can be S_False.
if (hr != HResult.S_OK || ix != 0)
{
throw new COMException("Interlaced", (int)HResult.E_FAIL);
}
}
IMFMediaBuffer pInput = null;
IMFMediaBuffer pOutput = null;
IMFSample pOutSample = null;
// Get the data buffer from the input sample. If the sample has
// multiple buffers, you might be able to get (slightly) better
// performance processing each buffer in turn rather than forcing
// a new, full-sized buffer to get created.
throwonhr = pInputSample.ConvertToContiguousBuffer(out pInput);
try
{
// Make a duplicate of the input sample
DuplicateSample(pInputSample, out pOutSample);
// Set the Discontinuity flag on the sample that's going to OutputSample.
HandleDiscontinuity(Discontinuity, pOutSample);
throwonhr = pOutSample.ConvertToContiguousBuffer(out pOutput);
// Process it.
DoWork(pInput, pOutput);
// Send the new output sample to the output sample queue.
OutputSample(pOutSample, InputMessageNumber);
}
catch
{
SafeRelease(pOutSample);
throw;
}
finally
{
// If (somewhere) there is .Net code that is holding on to an instance of
// the same buffer as pInput, this will yank the RCW out from underneath
// it, probably causing it to crash. But if we don't release it, our memory
// usage explodes.
SafeRelease(pInput);
SafeRelease(pOutput);
SafeRelease(pInputSample);
}
}
protected void ClearDesiredSampleTime(IMFSample pSample)
{
if (pSample == null)
{
throw new COMException("ClearDesiredSampleTime", E_Pointer);
}
IMFDesiredSample pDesired = null;
object pUnkSwapChain = null;
// We store some custom attributes on the sample, so we need to cache them
// and reset them.
//
// This works around the fact that IMFDesiredSample::Clear() removes all of the
// attributes from the sample.
int counter;
int hr;
hr = pSample.GetUINT32(MFSamplePresenter_SampleCounter, out counter);
MFError.ThrowExceptionForHR(hr);
try
{
Guid IID_IUnknown = new Guid("00000000-0000-0000-C000-000000000046");
hr = pSample.GetUnknown(MFSamplePresenter_SampleSwapChain, IID_IUnknown, out pUnkSwapChain);
MFError.ThrowExceptionForHR(hr);
}
catch { }
pDesired = (IMFDesiredSample)pSample;
pDesired.Clear();
hr = pSample.SetUINT32(MFSamplePresenter_SampleCounter, counter);
MFError.ThrowExceptionForHR(hr);
if (pUnkSwapChain != null)
{
hr = pSample.SetUnknown(MFSamplePresenter_SampleSwapChain, pUnkSwapChain);
MFError.ThrowExceptionForHR(hr);
}
SafeRelease(pUnkSwapChain);
//SafeRelease(pDesired);
}
