mccluney
asked on
How do I set the master volume level?
I'd like to be able to programmatically set the master volume level -- i.e. the equivalent of using the volume control in the system tray. I've found how to set the wave volume, and the midi volume looks similar, but how do I set the overall master volume? Thanks!
ASKER
This shows how to set the volume for a particular device, but how do I set the overall system volume? I.e. I want to mimic the master volume slider (which doesn't move the sliders for the individual channels, but does affect the volume of all the devices). Is there a device for the master volume?
ASKER CERTIFIED SOLUTION
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Attribute VB_Name = "MIXER"
'*************************
' ************
'* This constant holds the value of the Highest Custom volume set
' ting. The *
' '* lowest value will always be zero.*
'*************************
' ************
Public Const HIGHEST_VOLUME_SETTING = 12
' 'Put these into a module
' ' device ID for aux device mapper
Public Const AUX_MAPPER = -1&
Public Const MAXPNAMELEN = 32
Type AUXCAPS
wMid As Integer
wPid As Integer
vDriverVersion As Long
szPname As String * MAXPNAMELEN
wTechnology As Integer
dwSupport As Long
End Type
' ' flags for wTechnology field in AUXCAPS structure
Public Const AUXCAPS_CDAUDIO = 1 ' audio from internal CD-ROM drive
Public Const AUXCAPS_AUXIN = 2 ' audio from auxiliary input jacks
' ' flags for dwSupport field in AUXCAPS structure
Public Const AUXCAPS_VOLUME = &H1 ' supports volume control
Public Const AUXCAPS_LRVOLUME = &H2 ' separate left-right volume control
Declare Function auxGetNumDevs Lib "winmm.dll" () As Long
Declare Function auxGetDevCaps Lib "winmm.dll" Alias "auxGetDevCapsA" (ByVal uDeviceID As Long, lpCaps As AUXCAPS, ByVal uSize As Long) As Long
Declare Function auxSetVolume Lib "winmm.dll" (ByVal uDeviceID As Long, ByVal dwVolume As Long) As Long
Declare Function auxGetVolume Lib "winmm.dll" (ByVal uDeviceID As Long, ByRef lpdwVolume As Long) As Long
Declare Function auxOutMessage Lib "winmm.dll" (ByVal uDeviceID As Long, ByVal msg As Long, ByVal dw1 As Long, ByVal dw2 As Long) As Long
'*************************
' ************
' '* Possible Return values from auxGetVolume, auxSetVolume*
'*************************
' ************
Public Const MMSYSERR_NOERROR = 0
Public Const MMSYSERR_BASE = 0
Public Const MMSYSERR_BADDEVICEID = (MMSYSERR_BASE + 2)
'*************************
' ************
' '* Use the CopyMemory function from the Windows API *
'*************************
' ************
Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)
'*************************
' ************
' '* Use this structure to break the Long into two Integers*
'*************************
' ************
Public Type VolumeSetting
LeftVol As Integer
RightVol As Integer
End Type
Sub lCrossFader()
' 'Vol1 = 100 - Slider1.Value ' Left
' 'Vol2 = 100 - Slider5.Value ' Right
' 'E = CrossFader.Value
' 'F = 100 - E
' 'If Check4.Value = 1 Then ' Half Fader Check
' 'LVol = (F * Val(Vol1) / 100) * 2
' 'RVol = (E * Val(Vol2) / 100) * 2
' 'If LVol > (50 * Val(Vol1) / 100) * 2 Then
' 'LVol = (50 * Val(Vol1) / 100) * 2
' 'End If
' 'If RVol > (50 * Val(Vol2) / 100) * 2 Then
' 'RVol = (50 * Val(Vol2) / 100) * 2
' 'End If
' 'Else
' 'LVol = (F * Val(Vol1) / 100)
' 'RVol = (E * Val(Vol2) / 100)
' 'End If
'Label1.Caption = "Fader: " + LTrim$(Str$(LVol)) + " x " + LTrim$
' (Str$(RVol))
' '
End Sub
Public Function lSetVolume(ByRef lLeftVol As Long, ByRef lRightVol As Long, lDeviceID As Long) As Long
'*************************
' ************
'* This function sets the current Windows volume settings to the
' specified *
'* device using two Custom numbers from 0 to HIGHEST_VOLUME_SETTI
' NG for the *
' '* right and left volume settings. *
' '* *
'* The return value of this function is the Return value of the a
' uxGetVolume*
' '* Windows API call.*
'*************************
' ************
Dim bReturnValue As Boolean ' Return Value from Function
Dim Volume As VolumeSetting ' Type structure used to convert a long to/from
' ' two Integers.
Dim lAPIReturnVal As Long' Return value from API Call
Dim lBothVolumes As Long' The API passed value of the Combined Volumes
'*************************
' ************
' '* Calculate the Integers*
'*************************
' ************
Volume.LeftVol = nSigned(lLeftVol * 65535 / HIGHEST_VOLUME_SETTING)
Volume.RightVol = nSigned(lRightVol * 65535 / HIGHEST_VOLUME_SETTING)
'*************************
' ************
' '* Combine the Integers into a Long to be Passed to the API *
'*************************
' ************
lDataLen = Len(Volume)
CopyMemory lBothVolumes, Volume.LeftVol, lDataLen
'*************************
' ************
' '* Set the Value to the API*
'*************************
' ************
lAPIReturnVal = auxSetVolume(lDeviceID, lBothVolumes)
lSetVolume = lAPIReturnVal
End Function
Public Function lGetVolume(ByRef lLeftVol As Long, ByRef lRightVol As Long, lDeviceID As Long) As Long
'*************************
' ************
'* This function reads the current Windows volume settings from t
' he *
' '* specified device, and returns two numbers from 0 to *
'* HIGHEST_VOLUME_SETTING for the right and left volume settings.
' *
' '* *
'* The return value of this function is the Return value of the a
' uxGetVolume*
' '* Windows API call.*
'*************************
' ************
Dim bReturnValue As Boolean ' Return Value from Function
Dim Volume As VolumeSetting ' Type structure used to convert a long to/from
' ' two Integers.
Dim lAPIReturnVal As Long' Return value from API Call
Dim lBothVolumes As Long' The API Return of the Combined Volumes
'*************************
' ************
' '* Get the Value from the API*
'*************************
' ************
lAPIReturnVal = auxGetVolume(lDeviceID, lBothVolumes)
'*************************
' ************
' '* Split the Long value returned from the API into to Integers *
'*************************
' ************
lDataLen = Len(Volume)
CopyMemory Volume.LeftVol, lBothVolumes, lDataLen
'*************************
' ************
' '* Calculate the Return Values. *
'*************************
' ************
lLeftVol = HIGHEST_VOLUME_SETTING * lUnsigned(Volume.LeftVol) / 65535
lRightVol = HIGHEST_VOLUME_SETTING * lUnsigned(Volume.RightVol)
lGetVolume = lAPIReturnVal
End Function
Public Function nSigned(ByVal lUnsignedInt As Long) As Integer
Dim nReturnVal As Integer ' Return value from Function
If lUnsignedInt > 65535 Or lUnsignedInt < 0 Then
MsgBox "Error in conversion from Unsigned to nSigned Integer"
nSignedInt = 0
Exit Function
End If
If lUnsignedInt > 32767 Then
nReturnVal = lUnsignedInt - 65536
Else
nReturnVal = lUnsignedInt
End If
nSigned = nReturnVal
End Function
Public Function lUnsigned(ByVal nSignedInt As Integer) As Long
Dim lReturnVal As Long ' Return value from Function
If nSignedInt < 0 Then
lReturnVal = nSignedInt + 65536
Else
lReturnVal = nSignedInt
End If
If lReturnVal > 65535 Or lReturnVal < 0 Then
MsgBox "Error in conversion from nSigned to Unsigned Integer"
lReturnVal = 0
End If
lUnsigned = lReturnVal
End Function