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The mixer services provide functions for determining information about audio lines, audio-line controls, and control details. The services also provide functions for setting control details.

You can use the mixerGetLineInfofunction to retrieve information about a specified audio line. This function fills the MIXERLINEstructure for a specified source audio line, destination audio line, or line identifier.

The structure includes the destination line number, the number of channels in the audio line, as well as a short and a long name for the audio line.

The mixerGetLineControlsfunction retrieves general information about one or more controls associated with an audio line. This function fills the MIXERLINECONTROLSstructure with information about the specified controls.

You can use mixerGetLineControlsto retrieve control properties for one of the following:

  • All controls for a specified source line

  • A specified control for a specified source line

  • The first control of a specific class for a specified source line

The mixerGetControlDetailsfunction retrieves properties of a single control associated with an audio line. This function fills the MIXERCONTROLDETAILSstructure with the current values for a control.

The mixerSetControlDetailsfunction uses the contents of the MIXERCONTROLDETAILSstructure to set the properties of the specified control. You must ensure that all members of this structure are filled before you call mixerSetControlDetails.

See Also