WODM_PAUSE

This message is used in an MMDRV_MESSAGE_PARAMS structure passed to the WAV_IOControl function to request a waveform output driver to pause playback of a waveform.

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 WAVEERR error values declared in the Mmsystem.h header file.

Remarks

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

The driver stops playing the waveform and saves the current position. Playback continues from this position when the driver receives a WODM_RESTART message. The driver places any output buffers received with the WODM_WRITE message while playback is paused in the output queue.

If the driver receives this message when output is already paused, it returns MMSYSERR_NOERROR.