Microsoft DirectX 9.0

MSTape Driver

This topic applies to Windows XP only.

The MSTape driver supports D-VHS and MPEG camcorder devices. It is exposed to applications as the WDM Video Capture filter. Its functionality is similar to that of MSDV, the DV camcorder driver:

It appears in the "Video Capture Sources" (CLSID_VideoInputDeviceCategory) and "WDM Streaming Rendering Devices" (AM_KSCATEGORY_RENDER) filter categories.
An application can create an instance of the filter using the ICreateDevEnum interface.
It has an output pin for capture and transport from the device, and an input pin for transport to the device. Only one pin can be connected at time.

Media Types

The input pin supports one media type.

Major Type	MEDIATYPE_Stream
Subtype	MEDIASUBTYPE_MPEG2_TRANSPORT_STRIDE
Sample Size	192 x 256
Format Block	MPEG2_TRANSPORT_STRIDE

The output pin supports two media types.

Major Type	MEDIATYPE_Stream
Subtype	MEDIASUBTYPE_MPEG2_TRANSPORT_STRIDE
Sample Size	192 x 256
Format Block	MPEG2_TRANSPORT_STRIDE

Major Type	MEDIATYPE_Stream
Subtype	MEDIASUBTYPE_MPEG2_TRANSPORT_STRIDE
Sample Size	188 x 256
Format Block	NULL

Device Information

The driver dynamically reads information from the device configuration ROM. The application can retrieve this information by binding the device moniker to a property bag and calling the IPropertyBag::Read method.

Property	Description
UniqueID_Low	Unique ID of the device (low DWORD).
UniqueID_High	Unique ID of the device (high DWORD)
VendorID	Vendor ID.
ModelID	Model ID.
VendorText	Vendor name.
ModelText	Device model name.
UnitModelText	Unit model name; may be the same as ModelText.
DeviceOPcr0Payload	oPCR (Output Plug Control) payload. Example: 146 quadlets.
DeviceOPcr0DataRate	oPCR data rate. Examples: 0 (S100), 1 (S200), or 2 (S400).
DeviceClassGUID	GUID that identifies the device driver. For MSTape, this value is `{8C0F6AF2-0EDB-44C1-8AEB-59040BD830ED}`. This GUID is defined as MSTapeDeviceGUID in the header file Xprtdefs.h.
Description	A description of the device, taken from the INF file. This string usually contains the brand name of the device.

The device ID is a 64-bit integer. The low DWORD is stored in the UniqueID_Low property, and the high DWORD is stored in the UniqueID_High property.

For more information about device monikers, see Using the System Device Enumerator.

See Also

Controlling a DV Camcorder