WODM_BREAKLOOP

This message is used in an MMDRV_MESSAGE_PARAMS structure passed to the WAV_IOControl function to request a waveform output driver to break an output loop that was created with a WODM_WRITE message.

Parameters

uDeviceId

Device identifier—0, 1, 2, and so on—for the target device.

uMsg

Specifies this message.

dwUser

Specifies a device instance identifier.

dwParam1

Not used.

dwParam2

Not used.

Return Values

MMSYSERR_NOERROR indicates success. Otherwise, the driver returns one of the MMSYSERR or WAVERR error values declared in the Mmsystem.h header file.

Remarks

The ACM sends the WODM_BREAKLOOP message by calling the audio driver’s WAV_IOControl entry point through the DeviceIoControl function.

The driver should stop output of the loop buffers at the end of the next loop iteration.

If the driver receives this message and a loop is not in progress, it returns MMSYSERR_NOERROR.