public bool Matches(SupportedVideoFormat compareTo)
{
return
(Width == compareTo.Width &&
Height == compareTo.Height &&
Math.Abs(FrameRate - compareTo.FrameRate) < 0.01 &&
BitCount == compareTo.BitCount);
}
private static void DoSupportedVideoFormatsOperation(string deviceName, SupportedVideoFormatCallback callback)
{
IGraphBuilder graphBuilder = null;
ICaptureGraphBuilder2 captureGraphBuilder = null;
IBaseFilter theDevice = null;
try
{
graphBuilder = (IGraphBuilder) new FilterGraph();
captureGraphBuilder = (ICaptureGraphBuilder2) new CaptureGraphBuilder2();
theDevice = CreateFilter(FilterCategory.VideoInputDevice, deviceName);
// Attach the filter graph to the capture graph
int hr = captureGraphBuilder.SetFiltergraph(graphBuilder);
DsError.ThrowExceptionForHR(hr);
// Add the Video input device to the graph
hr = graphBuilder.AddFilter(theDevice, "source filter");
DsError.ThrowExceptionForHR(hr);
object o;
// AMMediaType media;
IAMStreamConfig videoStreamConfig;
IAMVideoControl videoControl = theDevice as IAMVideoControl;
hr = captureGraphBuilder.FindInterface(PinCategory.Capture, MediaType.Video, theDevice, typeof(IAMStreamConfig).GUID, out o);
DsError.ThrowExceptionForHR(hr);
videoStreamConfig = o as IAMStreamConfig;
try
{
if (videoStreamConfig == null)
{
throw new Exception("Failed to get IAMStreamConfig");
}
int iCount = 0, iSize = 0;
videoStreamConfig.GetNumberOfCapabilities(out iCount, out iSize);
IntPtr taskMemPointer = Marshal.AllocCoTaskMem(iSize);
AMMediaType pmtConfig = null;
for (int iFormat = 0; iFormat < iCount; iFormat++)
{
IntPtr ptr = IntPtr.Zero;
videoStreamConfig.GetStreamCaps(iFormat, out pmtConfig, taskMemPointer);
var v2 = (VideoInfoHeader)Marshal.PtrToStructure(pmtConfig.formatPtr, typeof(VideoInfoHeader));
if (v2.BmiHeader.BitCount > 0)
{
var entry = new SupportedVideoFormat()
{
Width = v2.BmiHeader.Width,
Height = v2.BmiHeader.Height,
BitCount = v2.BmiHeader.BitCount,
FrameRate = 10000000.0 / v2.AvgTimePerFrame
};
callback(entry);
Trace.WriteLine(entry.AsSerialized());
}
}
Marshal.FreeCoTaskMem(taskMemPointer);
DsUtils.FreeAMMediaType(pmtConfig);
}
finally
{
Marshal.ReleaseComObject(videoStreamConfig);
}
}
finally
{
if (theDevice != null)
{
Marshal.ReleaseComObject(theDevice);
}
if (graphBuilder != null)
{
Marshal.ReleaseComObject(graphBuilder);
}
if (captureGraphBuilder != null)
{
Marshal.ReleaseComObject(captureGraphBuilder);
}
}
}
public SupportedVideoFormat(SupportedVideoFormat cloneFrom)
{
Width = cloneFrom.Width;
Height = cloneFrom.Height;
FrameRate = cloneFrom.FrameRate;
BitCount = cloneFrom.BitCount;
}
public bool Matches(SupportedVideoFormat compareTo)
{
return
Width == compareTo.Width &&
Height == compareTo.Height &&
Math.Abs(FrameRate - compareTo.FrameRate) < 0.01 &&
BitCount == compareTo.BitCount;
}
private static void DoSupportedVideoFormatsOperation(string deviceName, SupportedVideoFormatCallback callback)
{
IGraphBuilder graphBuilder = null;
ICaptureGraphBuilder2 captureGraphBuilder = null;
IBaseFilter theDevice = null;
try
{
graphBuilder = (IGraphBuilder)new FilterGraph();
captureGraphBuilder = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();
theDevice = CreateFilter(FilterCategory.VideoInputDevice, deviceName);
// Attach the filter graph to the capture graph
int hr = captureGraphBuilder.SetFiltergraph(graphBuilder);
DsError.ThrowExceptionForHR(hr);
// Add the Video input device to the graph
hr = graphBuilder.AddFilter(theDevice, "source filter");
DsError.ThrowExceptionForHR(hr);
object o;
AMMediaType media;
IAMStreamConfig videoStreamConfig;
IAMVideoControl videoControl = theDevice as IAMVideoControl;
hr = captureGraphBuilder.FindInterface(PinCategory.Capture, MediaType.Video, theDevice, typeof(IAMStreamConfig).GUID, out o);
DsError.ThrowExceptionForHR(hr);
videoStreamConfig = o as IAMStreamConfig;
try
{
if (videoStreamConfig == null)
{
throw new Exception("Failed to get IAMStreamConfig");
}
int iCount = 0, iSize = 0;
videoStreamConfig.GetNumberOfCapabilities(out iCount, out iSize);
IntPtr taskMemPointer = Marshal.AllocCoTaskMem(iSize);
AMMediaType pmtConfig = null;
Trace.WriteLine(string.Format("Video formats supported by {0}:", deviceName));
for (int iFormat = 0; iFormat < iCount; iFormat++)
{
IntPtr ptr = IntPtr.Zero;
videoStreamConfig.GetStreamCaps(iFormat, out pmtConfig, taskMemPointer);
var v2 = (VideoInfoHeader)Marshal.PtrToStructure(pmtConfig.formatPtr, typeof(VideoInfoHeader));
if (v2.BmiHeader.BitCount > 0)
{
var entry = new SupportedVideoFormat()
{
Width = v2.BmiHeader.Width,
Height = v2.BmiHeader.Height,
BitCount = v2.BmiHeader.BitCount,
FrameRate = 10000000.0 / v2.AvgTimePerFrame
};
if (Math.Abs(entry.FrameRate - 0) < 0.01 || double.IsNaN(entry.FrameRate) || double.IsInfinity(entry.FrameRate))
{
// Some drivers don't report a frame rate or report incorrect frame rate. In this caasea dd both PAL and NTSC frame rates
entry.FrameRate = 25.0;
callback(entry);
var entry2 = new SupportedVideoFormat(entry);
entry2.FrameRate = 29.97;
callback(entry2);
}
else
callback(entry);
Trace.WriteLine(entry.AsSerialized());
}
}
Marshal.FreeCoTaskMem(taskMemPointer);
DsUtils.FreeAMMediaType(pmtConfig);
}
finally
{
Marshal.ReleaseComObject(videoStreamConfig);
}
}
finally
{
if (theDevice != null)
Marshal.ReleaseComObject(theDevice);
if (graphBuilder != null)
Marshal.ReleaseComObject(graphBuilder);
if (captureGraphBuilder != null)
Marshal.ReleaseComObject(captureGraphBuilder);
}
}
