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WPDM Messages (Compact 2013)

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3/26/2014

The following table shows the messages passed to the PDD_WaveProc function to instruct the audio platform-dependent driver (PDD).

Programming element

Description

WPDM_CLOSE

This message is passed to the PDD_WaveProc function to instruct the audio PDD that the driver's waveXXXClose function has been called.

WPDM_CONTINUE

This message is passed to the PDD_WaveProc function to instruct the audio PDD to continue with the data pointed to by the wave header.

WPDM_ENDOFDATA

This message is passed to the PDD_WaveProc function to instruct the audio PDD that no more output data is available and that the audio circuit should finish playing the data blocks already received.

WPDM_GETDEVCAPS

This message is passed to the PDD_WaveProc function to instruct the audio PDD to query the hardware to determine its capabilities.

WPDM_GETMIXERVAL

This message is passed to the PDD_WaveProc function to instruct the audio PDD to query one of the current mixer settings.

WPDM_GETVOLUME

This message is passed to the PDD_WaveProc function to instruct the audio PDD to query the current volume setting of the audio device.

WPDM_OPEN

This message is passed to the PDD_WaveProc function to instruct the audio PDD to indicate that the waveform device will be sent data of the specified format.

WPDM_PAUSE

This message is passed to the PDD_WaveProc function to instruct the audio PDD to pause playback.

WPDM_RESTART

This message is passed to the PDD_WaveProc function to instruct the audio PDD to continue playing the paused data.

WPDM_SETMIXERVAL

This message is passed to the PDD_WaveProc function to instruct the audio PDD to set one of the mixer values.

WPDM_SETVOLUME

This message is passed to the PDD_WaveProc function to instruct the audio PDD to modify the current volume setting of the audio device.

WPDM_STANDBY

This message is passed to the PDD_WaveProc function to instruct the audio PDD to put the audio circuitry in standby mode.

WPDM_START

This message is passed to the PDD_WaveProc function to instruct the audio PDD to start with the data pointed to by the wave header.

WPDM_STOP

This message is passed to the PDD_WaveProc function to instruct the audio PDD to stop playback or recording immediately.

See Also

Reference

Waveform Audio Driver Reference
Waveform Audio Driver Structures
Waveform Audio Driver Functions
Waveform Input Driver Messages
Waveform Output Driver Messages
Audio PDD Functions