The MontiVision Buffer Access filter provides direct access to the frame buffer of a RGB video stream through use of a callback interface. Applications implement the interface and deliver an interface pointer to the MV Buffer Access filter. The ProcessBuffer(...) method of the callback interface is called by the filter for every processed video frame. This filter is the optimal solution when you are planning to integrate hardware independent video processing functionality into an existing application that needs to access the image data. There are two different callback interfaces available, IMVBufferAccessCallbackVB is designed for Visual Basic applications and IMVBufferAccessCallbackC for C/C++ applications. The IMVBufferAccessCallbackC interface provides greater performance, simply because the image buffer is accessed using pointers, whereas the Visual Basic style interface utilizes the SafeArray type.
This MontiVision DirectShow Filter is used in combination with the MontiVision Smart Control in the BufferAccess Sample Application.
| File: | BufferAccess.ax |
| CLSID: | CLSID_MVBufferAccess |
Supported Interfaces
Supported COM Events
The filter supports following events through the IMVFilterEvents interface. Look at the filter events page for more information.
| Event |
Value |
Description |
| MV_ALGORITHM_START_EVENT |
0 |
A filter starts processing a video frame or sample. |
| MV_ALGORITHM_END_EVENT |
1 |
A filter finishes processing a video frame or sample. |
Callback Interfaces Used