The portion of the file holding the audio data. The audio data may be compressed to save disk space. The data has to be decompressed using an audio decompressor before you can play (hear) it.

Software 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.

IltmmCapture::get_Volume

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#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 of the preview output. .

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.

This property gets only the volume leve that is applied to the preview output.

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

Elements:	IltmmCapture::put_Volume
Topics:	Multimedia Function Group