ACM Driver Messages

The following table lists the messages that the DriverProc function in an ACM driver can receive, along with the operation the driver performs when it receives each message. Message definitions are contained in msacmdrv.h.

Message	Operation Performed by Driver
ACMDM_DRIVER_ABOUT	Displays an About dialog box.
ACMDM_DRIVER_DETAILS	Returns information about the driver.
ACMDM_DRIVER_NOTIFY	Determines status changes in other drivers.
ACMDM_FILTER_DETAILS	Returns information about a filter.
ACMDM_FILTERTAG_DETAILS	Returns information about a filter tag (type).
ACMDM_FORMAT_DETAILS	Returns information about a format.
ACMDM_FORMAT_SUGGEST	Suggests an input or output format.
ACMDM_FORMATTAG_DETAILS	Returns information about a format tag (type).
ACMDM_HARDWARE_WAVE_CAPS_INPUT	Returns device input capabilities.
ACMDM_HARDWARE_WAVE_CAPS_OUTPUT	Returns device output capabilities.
ACMDM_STREAM_CLOSE	Closes a data stream.
ACMDM_STREAM_CONVERT	Performs conversion operations on supplied data, based on conversion parameters received by ACMDM_STREAM_OPEN.
ACMDM_STREAM_OPEN	Opens a data stream. Includes data conversion parameters.
ACMDM_STREAM_PREPARE	Prepares source and destination data buffers.
ACMDM_STREAM_RESET	Stops an asynchronous conversion operation.
ACMDM_STREAM_SIZE	Estimates the required size of a source or destination buffer.
ACMDM_STREAM_UNPREPARE	Removes preparation performed on source and destination data buffers.