Mixer Device Queries
The mixer services provide functions for determining the number of mixer
devices present in the system and the capabilities of the devices. You can also use
a mixer services function to determine the device identifier for a mixer device.
You can use the mixerGetNumDevs
function to determine how many mixer devices are present in the system. Mixer
devices are identified by a device identifier. Device identifiers are
determined implicitly from the number of devices present in a given system. They range
from zero through one less than the number of devices present.
Before using a mixer device, you must determine its capabilities. Audio
capabilities can vary from one multimedia computer to another, so applications need
to work with a variety of audio hardware.
You can use the mixerGetDevCaps
function to determine the capabilities of mixer devices. This function fills a MIXERCAPS
structure with information about the capabilities of a specified device.
function retrieves the audio mixer device identifier associated with a
specified device handle. For example, you could use this function
to retrieve the device identifier for an audio mixer and then use the device
identifier to adjust the volume or to display another control.
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