IDirectSound3DBuffer8::SetConeAngles Method

發行項
09/10/2011

[The feature associated with this page, DirectSound, is a legacy feature. It has been superseded by WASAPI and Audio Graphs. Media Casting have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Media Casting instead of DirectSound, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The SetConeAngles method sets the inside and outside angles of the sound projection cone.

Syntax

HRESULT SetConeAngles(
         DWORD dwInsideConeAngle,
         DWORD dwOutsideConeAngle,
         DWORD dwApply
)

Parameters

dwInsideConeAngle
Inside cone angle, in degrees. This is the angle within which the sound is at its normal volume.
dwOutsideConeAngle
Outside cone angle, in degrees. This is the angle outside of which the sound is at its outside volume.

dwApply
Value that indicates when the setting should be applied. Must be one of the following:

Value	Description
DS3D_DEFERRED	Settings are not applied until the application calls the CommitDeferredSettings method. This allows the application to change several settings and generate a single recalculation.
DS3D_IMMEDIATE	Settings are applied immediately, causing the system to recalculate the 3D coordinates for all 3D sound buffers.

Return Value

If the method succeeds, the return value is DS_OK. If the method fails, the return value may be DSERR_INVALIDPARAM.

Remarks

The minimum, maximum, and default cone angles are defined in Dsound.h as DS3D_MINCONEANGLE, DS3D_MAXCONEANGLE, and DS3D_DEFAULTCONEANGLE. Each angle must be in the range of 0 degrees (no cone) to 360 degrees (the full sphere). The default value is 360.

Requirements

Header: Declared in DSound.h.

Library: Use Dsound3d.dll.

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