// ksmedia.h

typedef struct _tagKSAUDIOENGINE_VOLUMELEVEL {
  LONG             TargetVolume;
  AUDIO_CURVE_TYPE CurveType;
  ULONGLONG        CurveDuration;
} KSAUDIOENGINE_VOLUMELEVEL, *PKSAUDIOENGINE_VOLUMELEVEL;
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Windows Driver Kit DDI reference (ns-ksmedia-_tagksaudioengine_volumelevel)

_tagKSAUDIOENGINE_VOLUMELEVEL structure

Description

The KSAUDIOENGINE_VOLUMELEVEL structure specifies the target volume level, ramp type, and duration within which the volume level should change, for a given volume level request via the KSPROPERTY_AUDIOENGINE_VOLUMELEVEL property.

Members

`TargetVolume`

Specifies the desired final volume level using the scale defined for the KSPROPERTY_AUDIOENGINE_VOLUMELEVEL property.

`CurveType`

Uses the AUDIO_CURVE_TYPE enumeration to specify the curve algorithm to apply over the duration specified, in order to reach the desired level. The curve begins at the current volume level and ends at the target volume level specified in the TargetVolume parameter.

`CurveDuration`

Specifies the duration, in hundreds of nanoseconds, over which the volume curve must take effect.

KSAUDIOENGINE_VOLUMELEVEL - NtDoc