IltmmCapture::get_Volume

#include "ltmm.h"

C Syntax

HRESULT IltmmCapture_get_Volume(pCapture, pVal)

C++ Syntax

HRESULT get_Volume(pVal)

 

IltmmCapture *pCapture;

/* pointer to an interface */

long *pVal;

/* pointer to a variable */

Retrieves the volume level of the audio stream The portion of the file holding the audio data. The audio data might be compressed to save disk space. The data has to be decompressed using an audio decompressor oftware component which decompresses audio. It must be designed to work with ACM or DirectShow. Note that different compression methods require different decompressors. There is no universal decompressor capable of decoding all compressed streams. before you can play (hear) it..

Parameter

Description

pCapture

Pointer to an IltmmCapture interface.

pVal

Pointer to a variable to be updated with the volume level of the audio stream. Possible values range from –10000 to 0. Divide the value by 100 to get the equivalent decibel value.

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 –10000 is silence. The scale is logarithmic.

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::put_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++.