IBasicAudio::get_Volume method (control.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The get_Volume method retrieves the volume (amplitude) of the audio signal.
Syntax
HRESULT get_Volume(
[out] long *plVolume
);
Parameters
[out] plVolume
Pointer to a variable that receive the volume. Divide by 100 to get equivalent decibel value. For example, –10,000 is –100 dB.
Return value
Returns an HRESULT value. Possible values include the following.
| Return code | Description |
|---|---|
|
The filter graph does not contain an audio renderer filter. (Possibly the source does not contain an audio stream.) |
|
NULL pointer argument. |
|
Success. |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | control.h (include Dshow.h) |
| Library | Strmiids.lib |