- Video capture filter properties how to#
- Video capture filter properties drivers#
- Video capture filter properties driver#
- Video capture filter properties code#
Public int QuerySupported(Guid guidPropSet, int dwPropID, out KSPropertySupport pTypeSupport) Marshal.StructureToPtr(PinCategory.Capture, pPropData, false) If (cbPropData < Marshal.SizeOf( typeof(Guid))) If (dwPropID != ( int)AMPropertyPin.Category)
PcbReturned = Marshal.SizeOf( typeof(Guid)) Public int Get(Guid guidPropSet, int dwPropID, IntPtr pInstanceData, int cbInstanceData, IntPtr pPropData, int cbPropData, out int pcbReturned)
Video capture filter properties code#
Implementation looks next way and it simple:Ĭopy Code public int Set(Guid guidPropSet, int dwPropID, IntPtr pInstanceData, int cbInstanceData, IntPtr pPropData, int cbPropData) And as requirements one pin of such filter should have Capture category. This necessary in case you specify category while rendering pin with ICaptureGraphBuilder2 interface or looking for pin with specified category. Using this interface we specify pin category guid. Registered filter looks next way in GraphEdit More details abt that interfaces you can find in MSDN. IAMBufferNegotiation allows configure allocator settings. IAMPushSource controls media samples timing offset and latency (mostly used for configuring audio video sync). IAMStreamControl is used for specify start and stop notifications (sometime cameras require time from 0.5 to 3 seconds for calibration and application can use this interface to skip startup samples or other needs). , IAMFilterMiscFlags // To allow getting flag that filter is live sourceĪs you can see I have made support of other interfaces for output pin, actually you can implement all same interfaces as the real WDM Proxy Filter, but I made only most useful interfaces for applications. Property page public class VirtualCamFilter : BaseSourceFilter Filter Guid // Specify Filter category for registering and filter merit , IAMBufferNegotiation // Allocator configuring , IAMPushSource // For push source settings and configuring , IKsPropertySet // For expose pin category Public class VirtualCamStream: SourceStream In additional the output pin should implement at least IKsPropertySet and IAMStreamConfig interfaces and filter should implement IAMFilterMiscFlags interface. Virtual Video Capture Source necessary to be registered in the Video Capture Sources category. We use BaseSourceFilter and SourceStream as a base classes for our filter and output pin.
ImplementationĬore functionality of the filter will be capturing screen and provide that data as a video stream, it works same way as in previous post.
Video capture filter properties how to#
In this article I describe how to make virtual and non-WDM Video Capture Source in C#.
Video capture filter properties driver#
That proxy filter refer to every capture device driver and registered with the device name in specified DirectShow Filters category (Video Capture Sources).
Video capture filter properties drivers#
Most capture devices in system are present as WDM drivers and that drivers are handled in system via WDM Video Capture Filter, which is proxy from Kernel Streaming into Microsoft DirectShow.
As people were queried for such filter I decide to make it, and put it into separate article as here, I think, necessary some implementation notes and code description. Implementation of this filter is based on my BaseClasses.NET library which described in my previous post ( Pure.
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