共用方式為

IAMVideoControl Interface

  • 發行項
 
Microsoft DirectShow 9.0

IAMVideoControl Interface

The IAMVideoControl interface controls certain video capture operations such as enumerating available frame rates and image orientation.

In addition to the methods inherited from IUnknown, the IAMVideoControl interface exposes the following methods.

Method Description
GetCaps Retrieves the capabilities of the underlying hardware.
SetMode Sets the video control mode of operation.
GetMode Retrieves the video control mode of operation.
GetCurrentActualFrameRate Retrieves the actual frame rate at which the device is streaming. This method is used with devices, such as the Universal Serial Bus (USB) or cameras that use the IEEE 1394 serial standard, where the maximum frame rate can be limited by bandwidth availability. This is only available during video streaming.
GetMaxAvailableFrameRate Retrieves the maximum frame rate currently available based on bus bandwidth usage for connections such as USB and IEEE 1394 camera devices where the maximum frame rate can be limited by bandwidth availability.
GetFrameRateList Retrieves a list of available frame rates.

Remarks

For Windows Driver Model (WDM) devices, the WDM Video Capture Filter automatically exposes this interface if the WDM driver supports the PROPSETID_VIDCAP_VIDEOCONTROL property set. For more information, see the Windows DDK documenation.

Requirements

Header: Declared in Strmif.h; include Dshow.h.

Library: Use Strmiids.lib.