public CaptureFormat[] GetCaptureFormats()
{
if (m_pSource == null)
{
CreateVideoCaptureSource();
}
IMFPresentationDescriptor pPD = null;
IMFStreamDescriptor pSD = null;
IMFMediaTypeHandler pHandler = null;
IMFMediaType pType = null;
int hr = m_pSource.CreatePresentationDescriptor(out pPD);
MFError.ThrowExceptionForHR(hr);
bool fSelected;
hr = pPD.GetStreamDescriptorByIndex(0, out fSelected, out pSD);
MFError.ThrowExceptionForHR(hr);
hr = pSD.GetMediaTypeHandler(out pHandler);
MFError.ThrowExceptionForHR(hr);
int cTypes = 0;
hr = pHandler.GetMediaTypeCount(out cTypes);
MFError.ThrowExceptionForHR(hr);
CaptureFormat[] captureFormats = new CaptureFormat[cTypes];
for (int i = 0; i < cTypes; i++)
{
hr = pHandler.GetMediaTypeByIndex(i, out pType);
MFError.ThrowExceptionForHR(hr);
CaptureFormat mediatype = LogMediaType(pType);
Trace.WriteLine(mediatype);
Trace.WriteLine("Media Type " + i.ToString());
captureFormats[i] = mediatype;
//OutputDebugString(L"\n");
Marshal.FinalReleaseComObject(pType);
}
Marshal.FinalReleaseComObject(pPD);
Marshal.FinalReleaseComObject(pSD);
Marshal.FinalReleaseComObject(pHandler);
Marshal.FinalReleaseComObject(pType);
return(captureFormats);
}
private CaptureFormat LogMediaType(IMFMediaType pType)
{
int count = 0;
int hr = pType.GetCount(out count);
MFError.ThrowExceptionForHR(hr);
if (count == 0)
{
Trace.WriteLine("Empty media type.");
}
CaptureFormat capFormat = new CaptureFormat();
for (int i = 0; i < count; i++)
{
LogAttributeValueByIndex(pType, i, ref capFormat);
MFError.ThrowExceptionForHR(hr);
}
return(capFormat);
}
private string LogAttributeValueByIndex(IMFAttributes pAttr, int index, ref CaptureFormat capFormat)
{
//string pGuidName = null;
//string pGuidValName = null;
Guid guid = Guid.Empty;
PropVariant var = new PropVariant();
//PropVariantInit(&var);
int hr = pAttr.GetItemByIndex(index, out guid, var);
MFError.ThrowExceptionForHR(hr);
if (guid == MFAttributesClsid.MF_MT_FRAME_RATE)
{
//Trace.WriteLine("MF_MT_FRAME_RATE");
int lower = (int)var.GetULong();
//Trace.WriteLine("LogAttr1_1 = " + lower.ToString());
int upperbits = (int)(var.GetULong() >> 32);
//Trace.WriteLine("LogAttr1_2 = " + upperbits.ToString());
float fr = (float)upperbits / (float)lower;
capFormat.Framerate = fr;
Trace.WriteLine("FrameRate = " + fr.ToString());
return("Framerate=" + fr.ToString() + ", ");
}
else if (guid == MFAttributesClsid.MF_MT_FRAME_RATE_RANGE_MAX)
{
//Trace.WriteLine("MF_MT_FRAME_RATE_RANGE_MAX");
int lower = (int)var.GetULong();
//Trace.WriteLine("LogAttr1_1 = " + lower.ToString());
int upperbits = (int)(var.GetULong() >> 32);
//Trace.WriteLine("LogAttr1_2 = " + upperbits.ToString());
//return "MaxFramerate=" + fr.ToString() + ", ";
}
else if (guid == MFAttributesClsid.MF_MT_FRAME_RATE_RANGE_MIN)
{
//Trace.WriteLine("MF_MT_FRAME_RATE_RANGE_MIN");
int lower = (int)var.GetULong();
//Trace.WriteLine("LogAttr1_1 = " + lower.ToString());
int upperbits = (int)(var.GetULong() >> 32);
float fr = (float)upperbits / (float)lower;
//return "MinFramerate=" + fr.ToString() + ", ";
//Trace.WriteLine("LogAttr1_2 = " + upperbits.ToString());
}
else if (guid == MFAttributesClsid.MF_MT_FRAME_SIZE)
{
//Trace.WriteLine("MF_MT_FRAME_SIZE");
int lower = (int)var.GetULong();
// Trace.WriteLine("LogAttr1_1 = " + lower.ToString());
int upperbits = (int)(var.GetULong() >> 32);
//Trace.WriteLine("LogAttr1_2 = " + upperbits.ToString());
capFormat.Height = lower;
capFormat.Width = upperbits;
Trace.WriteLine("Resolution=" + lower.ToString() + "X" + upperbits.ToString());
return("Resolution=" + lower.ToString() + "X" + upperbits.ToString());
}
else if (guid == MFAttributesClsid.MF_MT_PIXEL_ASPECT_RATIO)
{
//Trace.WriteLine("MF_MT_PIXEL_ASPECT_RATIO");
int lower = (int)var.GetULong();
//Trace.WriteLine("LogAttr1_1 = " + lower.ToString());
int upperbits = (int)(var.GetULong() >> 32);
//Trace.WriteLine("LogAttr1_2 = " + upperbits.ToString());
}
else if (guid == MFAttributesClsid.MF_MT_GEOMETRIC_APERTURE)
{
//Trace.WriteLine("MF_MT_GEOMETRIC_APERTURE");
//Trace.WriteLine("LogAttr2 = " + var.ToString());
}
else if (guid == MFAttributesClsid.MF_MT_MINIMUM_DISPLAY_APERTURE)
{
//Trace.WriteLine("MF_MT_MINIMUM_DISPLAY_APERTURE");
//Trace.WriteLine("LogAttr2 = " + var.ToString());
}
else if (guid == MFAttributesClsid.MF_MT_PAN_SCAN_APERTURE)
{
//Trace.WriteLine("MF_MT_PAN_SCAN_APERTURE");
//Trace.WriteLine("LogAttr2 = " + var.ToString());
}
else if (guid == MFAttributesClsid.MF_MT_SUBTYPE)
{
capFormat.PixelFormat = var.GetGuid();
}
else
{
Trace.WriteLine("Unknown attr " + guid.ToString() + " val = " + var.ToString());
}
return("");
}
