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Volume Manipulation Classes

, 16 Nov 1999
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Volume manipulation classes.


Many times my applications required audio volume manipulation. To make the volume-enabled application development easier, I decided to create a few C++ classes that would allow me to easily regulate and track the changes of such volume controls as Output Master Volume, WaveOut Volume and Input (WaveIn) Volume. Here I provide such classes that share a common interface (defined in IVolume.h):

  • bool IsAvailable() - Says whether the volume controlling is possible.
  • void Enable() - Enables the line of the volume control.
  • void Disable() - Disables the line of the volume control.
  • DWORD GetVolumeMetric() - Retrieves the granularity of volume.
  • DWORD GetMinimalVolume() - Retrieves the minimal volume that can be set.
  • DWORD GetMaximalVolume() - Retrieves the maximal volume that can be set.
  • DWORD GetCurrentVolume() - Retrieves the current volume.
  • void SetCurrentVolume( DWORD dwValue ) - Sets the volume.

And the last function allows to register a user-implemented callback that will be called as a notification of volume changes:

void RegisterNotificationSink( PONMICVOULUMECHANGE, DWORD )

This interface is implemented by CVolumeOutMaster (VolumeOutMaster.h/cpp), CVolumeOutWave (VolumeOutWave.h/cpp) and CVolumeInXXX (VolumeInXXX.h/cpp) classes. The usage of the classes is very simple:

In your StdAfx.h, include "mmSystem.h" and make sure you link to the "winmm.lib" (#pragma comment(lib, "winmm.lib")). Then, if you are going to use Output Mater volume control, include "VolumeOutMaster.h", say, to the StdAfx.h.

The IVolume.h, VolumeInXXX.h, VolumeInXXX.cpp are to be inserted as your project files.

void CALLBACK MasterVolumeChanged( DWORD dwCurrentVolume, DWORD dwUserValue );
// Volume control Initialization
IVolume* pMasterVolume = (IVolume*)new CVolumeOutMaster();
if ( !pMasterVolume || !pMasterVolume->IsAvailable() )
    // handle error
pMasterVolume->RegisterNotificationSink( MasterVolumeChanged, dwAnyUserValue );
pMasterVolume->SetCurrentVolume( dwVolumeToSet );
DWORD dwCurrentVolume = pMasterVolume->SetCurrentVolume();
void CALLBACK MasterVolumeChanged( DWORD dwCurrentVolume, DWORD dwUserValue )
   // handle the volume change

Very simple, isn't it? Yet, the CVolumeInXXX class requires more explanation. In order to manipulate the Input volume, the source line index is to be passed to the constructor. Confused? Please, be not. CVolumeInXXX class provides a static function to enumerate those lines:

bool EnumerateInputLines( PINPUTLINEPROC, DWORD dwUserValue );

This allows you to manipulate the volume of any WaveIn-based lines. Say, you want to manipulate the microphone volume:

bool CALLBACK EnumInputLineProc( UINT uLineIndex, 
              MIXERLINE* pLineInfo, DWORD dwUserValue );
// Initialization
UINT uMicrophoneLineIndex = (UINT)-1;
if ( !CVolumeInXXX::EnumerateInputLines( EnumInputLineProc, 
                           (DWORD)&uMicrophoneLineIndex ) )
   // handle error
if ( uMicrophoneLineIndex == (UINT)-1 )
        // Error: mic volume'ing is not available.
IVolume* pMicrophoneVolume = 
         (IVolume*)new CVolumeInXXX( uMicrophoneLineIndex );
if ( !pMicrophoneVolume || !pMicrophoneVolume->IsAvailable() )
   // handle error
// Go on and use pMicrophoneVolume to manipulate the volume
bool CALLBACK EnumInputLineProc( UINT uLineIndex, 
              MIXERLINE* pLineInfo, DWORD dwUserValue )
    if ( pLineInfo->dwComponentType == 
        *((UINT*)dwUserValue) = uLineIndex;
        return false;
    return true;

Be aware, that for performance reasons it is better to have a single instance of a given class per application. So don't rush to create lots of CVolumeInXXX objects, better share the only one through your code.


The proposed classes do not encapsulate all the abilities exposed by the mixers. However, working with a mixer just to add a pretty simple functionality is quite boring. That's why, as I think, the proposed classes might be of some help to you.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Alex Chmut
Web Developer
Ukraine Ukraine
No Biography provided

Comments and Discussions

QuestionBegginer's question Pinmemberlnenad12-Nov-06 9:12 
QuestionHigh Definition Audio PinmemberSaber00119-Jul-06 1:09 
QuestionHow to use Volume Manipulation Classes Pinmembercastlezhen28-Apr-06 4:04 
GeneralDiable Microphone Pinmemberanakia18-Apr-06 18:05 
General[Q] Love your article and more... Pinmemberyoontet17-Aug-05 6:52 
GeneralRe: [Q] Love your article and more... Pinmemberyoontet17-Aug-05 7:23 
GeneralProblems with Microphone control PinmemberVirendra Sharma26-May-05 0:29 
GeneralRe: Problems with Microphone control PinmemberFco Javier Lama4-May-06 0:24 
Generaldoesn t work with a USB headset Pinmemberbartouze22-Apr-05 4:09 
GeneralProblem passing callback function in... Pinmemberel davo4-Mar-04 14:48 
GeneralRe: Problem passing callback function in... Pinmemberladuran27-Aug-04 13:55 
GeneralRe: Problem passing callback function in... PinmemberVinod Vijayan29-Jan-05 1:06 
QuestionHow to determine whether volume is enabled? PinmemberM A V22-Feb-04 10:54 
There are Enable() and Disable() methods.
But how to determine whether volume is currently enabled or disabled?
GeneralMany Compile Errors - microphone implementation PinmemberBobboots12-Feb-04 20:19 
GeneralSolved Compile - microphone vol does not change... PinsussAnonymous13-Feb-04 17:40 
Generalline-in playback PinsussAnonymous12-Feb-04 11:53 
GeneralRe: line-in playback PinmemberSaber00119-Jul-06 1:13 
GeneralRe: line-in playback Pinmemberwanhaven23-Feb-07 2:38 
GeneralDisplaying input audio level in progress bar PinmemberHridaynath Musale10-Feb-04 14:24 
GeneralFound bug. It should called the destructor. Pinmembersaintstone1-Feb-04 18:28 
GeneralThanks! Pinmembersparky90923-Oct-03 2:05 
GeneralRe: Thanks! PinsussAnonymous8-Aug-04 5:33 
GeneralmmSystem.h Pinmemberdietercools20-Sep-03 14:02 
GeneralRe: mmSystem.h Pinmembersparky90923-Oct-03 1:57 
GeneralRe: mmSystem.h Pinmemberdietercools11-Feb-04 9:42 
GeneralRe: mmSystem.h PinsussAnonymous11-Feb-04 14:21 
QuestionHow to support WinCE Pinmemberweblxj2-Jul-03 16:03 
AnswerRe: How to support WinCE PinmemberAlex Chmut2-Jul-03 23:17 
Generalstdafx.h PinmemberM.Joshi5-Apr-03 6:44 
AnswerRe: stdafx.h PinmemberSaber00119-Jul-06 0:54 
GeneralRe: stdafx.h PinmemberSaber00119-Jul-06 1:05 
Generalto increse the volume Pinsussxyz1233-Feb-03 2:57 
GeneralRe: to increse the volume PinsussAnonymous20-Nov-03 23:26 
GeneralDoes not work while device in use Pinmembercodermallu1-Aug-02 4:11 
GeneralRe: Does not work while device in use PinmemberPeter B.22-May-03 11:55 
GeneralHelp: compilation error for VolumeInXXX.cpp PinmemberAnnette Skaar7-Jul-02 18:51 
QuestionChanges the balance !?!? PinmemberLou4-May-02 14:03 
AnswerRe: Changes the balance !?!? PinmemberKuZiKuZi6-Jan-05 21:04 
GeneralDoes not work with USB Audio Device PinmemberAnonymous12-Feb-02 9:09 
GeneralRe: Does not work with USB Audio Device PinmemberNR19-Feb-02 15:03 
GeneralRe: Does not work with USB Audio Device PinmemberPeter B.23-Dec-02 4:31 
GeneralHere is my solution... Pinmemberpengok25-Nov-04 20:43 
GeneralSample project required Pinmembersantu28-Nov-01 0:23 
GeneralRe: Sample project required PinmemberAtlantys11-Feb-02 6:03 
GeneralRe: Sample project required Pinmemberlordsoth998-Jul-04 10:50 
GeneralRecording Pinmemberyoavadler5-Nov-01 23:58 
GeneralRe: Recording PinmemberYong23-Nov-01 7:05 
GeneralThanks! But I have a question. Pinmemberhoonja23-Oct-01 2:16 
GeneralRe: Thanks! But I have a question. PinmemberYong23-Nov-01 7:14 
QuestionpLineInfo initialization? PinmemberAnonymous22-Sep-01 6:27 

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