The ICM_COMPRESS_GET_SIZE message is sent to a video compression driver to obtain the maximum size of one frame of data when it is compressed in the output format.
Parameters
dwParam1
Specifies a pointer to a BITMAPINFO data structure indicating the input format.
dwParam2
Specifies a pointer to a BITMAPINFO data structure indicating the output format.
Return Value
Returns the maximum number of bytes a single compressed frame can occupy.
Comments
Typically, applications send this message to determine how large a buffer to allocate for the compressed frame.
The driver should calculate the size of the largest possible frame based on the input and target formats.