The following table lists the messages that the DriverProc function in a user-mode video capture driver can receive, along with the operation the driver performs when it receives each message. Message definitions are contained in msviddrv.h and msvideo.h.
Message |
Operation Performed by Driver |
Saves or restores configuration information. | |
Displays a dialog box to obtain configuration information. | |
Sets or retrieves destination rectangle parameters. | |
Sets or retrieves video-capture format parameters. | |
Transfers data from the frame buffer. | |
Returns channel capabilities. | |
Returns the text string associated with an error number. | |
Returns the video API version used by the driver. | |
Sets or retrieves a logical palette. | |
Sets a logical palette and an RGB555 translation table. | |
Sets or retrieves source rectangle parameters. | |
Adds a data buffer to a capture stream. | |
Terminates a capture stream. | |
Returns a stream’s error status. | |
Returns the current position within a capture stream. | |
Initializes a capture stream. | |
Prepares a data buffer. | |
Stops and resets a capture stream. | |
Starts a capture stream. | |
Stops a capture stream. | |
Removes preparation from a data buffer. | |
Updates a screen overlay area. |