Click here to Skip to main content
11,485,965 members (78,049 online)
Click here to Skip to main content

Volume Manipulation Classes

, 16 Nov 1999 305.2K 4.4K 83
Rate this:
Please Sign up or sign in to vote.
Volume manipulation classes.

Introduction

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->Enable();
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 == 
             MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE )
    {
        *((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.

Conclusion

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.

License

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.

A list of licenses authors might use can be found here

Share

About the Author

Alex Chmut
Web Developer
Ukraine Ukraine
No Biography provided

Comments and Discussions

 
SuggestionWindows 7 volume control sample Pin
M A V15-Dec-12 2:05
memberM A V15-Dec-12 2:05 
QuestionLicense? Pin
LuisVilla16-Feb-12 5:48
memberLuisVilla16-Feb-12 5:48 
AnswerRe: License? Pin
Alex Chmut16-Feb-12 11:15
memberAlex Chmut16-Feb-12 11:15 
GeneralControlling master volume in Win7 - IAudioEndpointVolume - Working sample code in MSDN Pin
kormoe15-Jan-12 6:39
memberkormoe15-Jan-12 6:39 
GeneralVolume Control in Windows7 Pin
Member 264083617-Aug-10 21:41
memberMember 264083617-Aug-10 21:41 
GeneralMaking compatible Pin
BazKhan18-Jan-09 23:49
memberBazKhan18-Jan-09 23:49 
QuestionWindows Vista Anyone??? Pin
{bill}1-Sep-08 10:41
member{bill}1-Sep-08 10:41 
AnswerRe: Windows Vista Anyone??? Pin
Steven Dong9-Nov-08 5:37
memberSteven Dong9-Nov-08 5:37 
QuestionCallback Function Pin
peene9-Aug-07 6:46
memberpeene9-Aug-07 6:46 
Questionhow can i control the sound of left and right speaker Pin
rajneshmalik1-Aug-07 22:49
memberrajneshmalik1-Aug-07 22:49 
GeneralProblem in 2000 Pin
lilesh26-Feb-07 23:56
memberlilesh26-Feb-07 23:56 
QuestionBegginer's question Pin
lnenad12-Nov-06 9:12
memberlnenad12-Nov-06 9:12 
QuestionHigh Definition Audio Pin
Saber00119-Jul-06 1:09
memberSaber00119-Jul-06 1:09 
QuestionHow to use Volume Manipulation Classes Pin
castlezhen28-Apr-06 4:04
membercastlezhen28-Apr-06 4:04 
GeneralDiable Microphone Pin
anakia18-Apr-06 18:05
memberanakia18-Apr-06 18:05 
General[Q] Love your article and more... Pin
yoontet17-Aug-05 6:52
memberyoontet17-Aug-05 6:52 
GeneralRe: [Q] Love your article and more... Pin
yoontet17-Aug-05 7:23
memberyoontet17-Aug-05 7:23 
I've tested your Enable() funtion and found some error in my computer. I don't know whether it is applicable to other computers.

Error is that somehow the Detail value in Enable() is counted in backward, which means it should accumulate the data from the end of buffer.

aDetails[nMultipleItems-nItem-1].fValue = lValue;

Then you can enable the selection that you have chosen input in enumeration().

Thanks.

GeneralProblems with Microphone control Pin
Virendra Sharma26-May-05 0:29
memberVirendra Sharma26-May-05 0:29 
GeneralRe: Problems with Microphone control Pin
Fco Javier Lama4-May-06 0:24
memberFco Javier Lama4-May-06 0:24 
Generaldoesn t work with a USB headset Pin
bartouze22-Apr-05 4:09
memberbartouze22-Apr-05 4:09 
GeneralProblem passing callback function in... Pin
el davo4-Mar-04 14:48
memberel davo4-Mar-04 14:48 
GeneralRe: Problem passing callback function in... Pin
laduran27-Aug-04 13:55
memberladuran27-Aug-04 13:55 
GeneralRe: Problem passing callback function in... Pin
Vinod Vijayan29-Jan-05 1:06
memberVinod Vijayan29-Jan-05 1:06 
QuestionHow to determine whether volume is enabled? Pin
M A V22-Feb-04 10:54
memberM A V22-Feb-04 10:54 
GeneralMany Compile Errors - microphone implementation Pin
Bobboots12-Feb-04 20:19
memberBobboots12-Feb-04 20:19 
GeneralSolved Compile - microphone vol does not change... Pin
Anonymous13-Feb-04 17:40
sussAnonymous13-Feb-04 17:40 
Generalline-in playback Pin
Anonymous12-Feb-04 11:53
sussAnonymous12-Feb-04 11:53 
GeneralRe: line-in playback Pin
Saber00119-Jul-06 1:13
memberSaber00119-Jul-06 1:13 
GeneralRe: line-in playback Pin
wanhaven23-Feb-07 2:38
memberwanhaven23-Feb-07 2:38 
GeneralDisplaying input audio level in progress bar Pin
Hridaynath Musale10-Feb-04 14:24
memberHridaynath Musale10-Feb-04 14:24 
GeneralFound bug. It should called the destructor. Pin
saintstone1-Feb-04 18:28
membersaintstone1-Feb-04 18:28 
GeneralThanks! Pin
sparky90923-Oct-03 2:05
membersparky90923-Oct-03 2:05 
GeneralRe: Thanks! Pin
Anonymous8-Aug-04 5:33
sussAnonymous8-Aug-04 5:33 
GeneralmmSystem.h Pin
dietercools20-Sep-03 14:02
memberdietercools20-Sep-03 14:02 
GeneralRe: mmSystem.h Pin
sparky90923-Oct-03 1:57
membersparky90923-Oct-03 1:57 
GeneralRe: mmSystem.h Pin
dietercools11-Feb-04 9:42
memberdietercools11-Feb-04 9:42 
GeneralRe: mmSystem.h Pin
Anonymous11-Feb-04 14:21
sussAnonymous11-Feb-04 14:21 
QuestionHow to support WinCE Pin
weblxj2-Jul-03 16:03
memberweblxj2-Jul-03 16:03 
AnswerRe: How to support WinCE Pin
Alex Chmut2-Jul-03 23:17
memberAlex Chmut2-Jul-03 23:17 
Generalstdafx.h Pin
M.Joshi5-Apr-03 6:44
memberM.Joshi5-Apr-03 6:44 
AnswerRe: stdafx.h Pin
Saber00119-Jul-06 0:54
memberSaber00119-Jul-06 0:54 
GeneralRe: stdafx.h Pin
Saber00119-Jul-06 1:05
memberSaber00119-Jul-06 1:05 
Generalto increse the volume Pin
xyz1233-Feb-03 2:57
sussxyz1233-Feb-03 2:57 
GeneralRe: to increse the volume Pin
Anonymous20-Nov-03 23:26
sussAnonymous20-Nov-03 23:26 
GeneralDoes not work while device in use Pin
codermallu1-Aug-02 4:11
membercodermallu1-Aug-02 4:11 
GeneralRe: Does not work while device in use Pin
Peter B.22-May-03 11:55
memberPeter B.22-May-03 11:55 
GeneralHelp: compilation error for VolumeInXXX.cpp Pin
Annette Skaar7-Jul-02 18:51
memberAnnette Skaar7-Jul-02 18:51 
QuestionChanges the balance !?!? Pin
Lou4-May-02 14:03
memberLou4-May-02 14:03 
AnswerRe: Changes the balance !?!? Pin
KuZiKuZi6-Jan-05 21:04
memberKuZiKuZi6-Jan-05 21:04 
GeneralDoes not work with USB Audio Device Pin
Anonymous12-Feb-02 9:09
memberAnonymous12-Feb-02 9:09 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web03 | 2.8.150520.1 | Last Updated 17 Nov 1999
Article Copyright 1999 by Alex Chmut
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid