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ACMDM_STREAM_RESET (Compact 2013)

  • Article

3/26/2014

This message requests an ACM driver to stop conversion operations for the specified stream.

Parameters

  • dwDeviceID
    Value that specifies a driver instance identifier. The driver returns this value in response to the ACM_Open (ACM Driver) function.
  • hDriver
    Handle to a driver.
  • uMsg
    Value that specifies this message.
  • lParam2
    Value that contains the fdwReset parameter of the acmStreamReset function.

Return Values

A return value of MMSYSERR_NOERROR indicates success. Otherwise, the driver returns one of the MMSYSERR error values declared in the Mmsystem.h header file or one of the ACMERR error values declared in the Msacm.h header file.

Remarks

The ACM (Waveapi.dll) sends this message by calling the ACM driver's ACM_IOControl entry point through the DeviceIoControl function. The ACM sends this message when an application calls the acmStreamReset function. Only asynchronous drivers receive this message. If a client calls acmStreamReset for a synchronous driver, the ACM returns MMSYSERR_NOERROR without calling the driver.

When an asynchronous driver receives this message, it sets the ACMSTREAMHEADER_STATUSF_DONE flag and clears the ACMSTREAMHEADER_STATUSF_INQUEUE flag in every ACMDRVSTREAMHEADER structure contained in its conversion queue.

Requirements

Header

msacmdrv.h

See Also

Reference

ACM Driver Messages
ACM_Open (ACM Driver)
ACMDRVSTREAMINSTANCE
ACM_IOControl