Methods > Players and stream mixers > StreamVolumeSmoothingSet method

Remarks

Sets the smoothing times, expressed in milliseconds, and related volume curve required to perform a fade-in after a PlaySound call or a fade-out after a StopSound call.

During the fading session the CallbackForPlayersEvents delegate is invoked with the nEvent parameter set to the following values:

•	EV_FADEIN_STARTED, EV_FADING_VOLUME_CHANGED and EV_FADEIN_COMPLETED after a call to the PlaySound method

•	EV_FADEOUT_STARTED, EV_FADING_VOLUME_CHANGED and EV_FADEOUT_COMPLETED after a call to the StopSound method

Syntax

[Visual Basic]

Public Function StreamVolumeSmoothingSet (

nPlayerIndex as Int16,

bfadeIn as Boolean,

nSlideDuration as Int32,

nCurveType as enumVolumeCurves,

nDesignerUniqueId as Int32

) as enumErrorCodes

[C#]

public enumErrorCodes StreamVolumeSmoothingSet (

Int16 nPlayerIndex,

bool bfadeIn,

Int32 nSlideDuration,

enumVolumeCurves nCurveType,

Int32 nDesignerUniqueId

);

[C++]

public: enumErrorCodes StreamVolumeSmoothingSet (

Int16 nPlayerIndex,

bool bfadeIn,

Int32 nSlideDuration,

enumVolumeCurves nCurveType,

Int32 nDesignerUniqueId

);

Parameter

Description

nPlayerIndex

Number representing the zero-based index of the involved player

bfadeIn

Boolean value indicating if the smoothing, obtained through a volume sliding. must be applied on start or stop of playback.

Supported values are the following:

Mnemonic constant	Meaning
false	The volume slide setting is intended as a fade-out activated when the StopSound method is invoked.
true	The volume slide setting is intended as a fade-in activated when the PlaySound method is invoked.

nSlideDuration

The time required to perform the volume sliding after a call to the PlaySound or StopSound method.

Accepted values are from 0 (default value, no sliding, immediate play or stop) to 20000: higher or lower values will be automatically cut to the nearest supported value.

nCurveType

Type of curve applied to the volume sliding.

Supported values are the following:

Mnemonic constant	Value	Meaning

VOLUME_CURVE_LINEAR	1	Linear curve
VOLUME_CURVE_EXPONENTIAL	2	Exponential curve
VOLUME_CURVE_COSINE	3	Cosine curve
VOLUME_CURVE_SMOOTH	4	Smooth curve
VOLUME_CURVE_CUSTOM	5	Custom Bézier curve.

nDesignerUniqueId

Unique identifier of the curve editor control containing custom curve settings to apply. This unique identifier is returned by a previous call to the VolumeAutomation.CurveDesigner.Create method.

The custom curve designer manages a windowed control, whose visual aspect can be defined programmatically, which allows designing volume curves based upon Bézier curves whose shape is defined through the manual positioning of 2 control points (displayed in cyan color on the graphic below). For further information about the use of the embedded CurveDesigner refer to the tutorial How to create custom volume curves.

This parameter is ignored if the nScaleType parameter above has been set to a value different from VOLUME_CURVE_CUSTOM.

If you don't want to display the custom curve designer on your user interface but you know the exact position of the control points to set, you can use the StreamVolumeSmoothingSetEx method.

Return value

Value	Meaning

Negative value	An error occurred (see the LastError property for further error details)
enumErrorCodes.NOERROR (0)	The method call was successful.