The PutBitmap sample application demonstrates the direct access to the image data buffer of the MV Image File Source filter from within Visual Basic 6. The image file source filter provides the functionality to directly write image data into the image buffer instead of loading an image file. This is useful when it is required to feed image data located in system memory into a DirectShow filter configuration.
This and other sample applications can be found in the MV Development Kit installation directory.
Filter Graph Summary
A very simple filter configuration is used for this sample application, the MV Image File Source filter is connected to the video renderer displaying the image.
The Application
This simple sample application uses the MontiVision Smart Control to load and start the above shown filter configuration. The image 'C:\ppol.png' is loaded once on startup and the frame rate of the MV Image File Source filter is set to one frame per second. The filter events are received throught the Smart Control. Within the source filters MV_ALGORITHM_END_EVENT event, the sample application requests the image data from the image file source filter using IMVImageFileSource2::GetBitmapVB, inverts every byte of the image and sets the data back to the file source filter using IMVImageFileSource2::PutBitmapVB.
