Open Sound System
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The MIXT_ENUM control type is used for mixer controls that implement "enumerated" controls. The mixer application should use the SNDCTL_MIX_ENUMINFO ioctl all to obtain the "labels" for the possible values of the control.
The mixer control values are mapped to the choice names so that control value of 0 equals the first choice name and
maxvalue-1 equals to the last choice.
For example a mixer control that selects the syncronization source for a sound card may have values such as 0="INTERNAL", 1="WORDCLOCK" or 2="SPIDIF".