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IltmfCapture::get_Volume

Summary

Retrieves the volume level of the audio stream .

Syntax

#include "ltmf.h"

Language	Syntax
C	HRESULT IltmfCapture_get_Volume(pCapture, pVolume)
C++	HRESULT get_Volume(pVolume)

Parameters

IltmfCapture *pCapture

Pointer to an IltmfCapture interface.

long *pVolume

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

Value	Meaning
S_OK	The function was successful.
<> S_OK	An error occurred. Refer to the Error Codes or the HRESULT error codes in the MediaFoundation documentation.

Comments

Full volume is 0, and -10000 is silence. The scale is logarithmic.

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 before you can play (hear) it.

Audio decompressor

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.