![]() ![]() The normalized volume levels that are passed to this method are suitable to represent the positions of volume controls in application windows and on-screen displays.įor a code example that calls SetMasterVolumeLevelScalar, see Endpoint Volume Controls. For more information about audio-tapered curves, see Audio-Tapered Volume Controls. Note that the shape of the curve might change in future versions of Windows. Within this range, the relationship of the normalized volume level to the attenuation of signal amplitude is described by a nonlinear, audio-tapered curve. The volume level is normalized to the range from 0.0 to 1.0, where 0.0 is the minimum volume level and 1.0 is the maximum level. Parameter fLevel is outside the range from 0.0 to 1.0. If it fails, possible return codes include, but are not limited to, the values shown in the following table. If the caller supplies a NULL pointer for this parameter, the notification routine receives the context GUID value GUID_NULL. In its implementation of the OnNotify method, a client can inspect the event-context GUID to discover whether it or another client is the source of the volume-change event. If the SetMasterVolumeLevelScalar call changes the volume level of the endpoint, all clients that have registered IAudioEndpointVolumeCallback interfaces with that endpoint will receive notifications. There’s a variety of reasons, but some common reasons are: The growing complexity of your application architecture: As your architecture becomes more complex, interactions between all of the components in it increases. This parameter points to an event-context GUID. First, let’s understand why you might be running into a high volume of logs. The level is expressed as a normalized value in the range from 0.0 to 1.0.Ĭontext value for the IAudioEndpointVolumeCallback::OnNotify method. Syntax HRESULT SetMasterVolumeLevelScalar( The volume level is expressed as a normalized, audio-tapered value in the range from 0.0 to 1.0. The SetMasterVolumeLevelScalar method sets the master volume level of the audio stream that enters or leaves the audio endpoint device.
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