IltmmCapture::put_Volume

#include "ltmm.h"

C Syntax

HRESULT IltmmCapture_put_Volume(pCapture, Volume)

C++ Syntax

HRESULT put_Volume(Volume)

IltmmCapture *pCapture;

pointer to an interface

long Volume;

volume

Sets the volume level of the audio stream of the preview output.

Parameter

Description

pCapture

Pointer to an IltmmCapture interface.

Volume

Volume level to set. Possible values range from -10000 to 0.

Returns

S_OK

The function was successful.

<> S_OK

An error occurred. Refer to the Error Codes or the HRESULT error codes in the DirectShow documentation.

Comments

Full volume is 0, and -10,000 is silence. The scale is logarithmic. Multiply the desired decible level by 100 to get the value for newVal. For example, if you want a volume of -100 dB, set newVal to be -100 X 100 (that is, -10000).

The property only applies to the preview output. The audio stream in the captured  content is not affected.

Required DLLs and Libraries

LTMM

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64

See Also

Elements:

IltmmCapture::get_Volume

Topics:

Multimedia Function Group

Example

For a C example, refer to IltmmCapture::IsPreviewTapSupported Example for C.

For a C++ example, refer to IltmmCapture::IsPreviewTapSupported Example for C++.

Help Version 21.0.2021.7.19
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