Imports System
Imports System.Runtime.InteropServices
Public Class Sound
#Region " Events"
Public Event MuteChanged()
Public Event VolumeChanged()
#End Region
#Region " Constants"
Private Const MMSYSERR_NOERROR As Integer = 0
Private Const MAXPNAMELEN As Integer = 32
Private Const MIXER_LONG_NAME_CHARS As Integer = 64
Private Const MIXER_SHORT_NAME_CHARS As Integer = 16
Private Const MIXER_GETLINEINFOF_COMPONENTTYPE As Integer = &H3
Private Const MIXER_GETLINECONTROLSF_ONEBYTYPE As Integer = &H2
Private Const MIXER_GETCONTROLDETAILSF_VALUE As Integer = &H0
Private Const MIXER_SETCONTROLDETAILSF_VALUE As Integer = &H0
Private Const MIXERLINE_COMPONENTTYPE_DST_FIRST As Integer = &H0
Private Const MIXERLINE_COMPONENTTYPE_DST_SPEAKERS As Integer = MIXERLINE_COMPONENTTYPE_DST_FIRST + 4
'Private Const MIXERLINE_COMPONENTTYPE_SRC_FIRST As Integer = &H1000
'Private Const MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE As Integer = MIXERLINE_COMPONENTTYPE_SRC_FIRST + 3
'Private Const MIXERLINE_COMPONENTTYPE_SRC_LINE As Integer = MIXERLINE_COMPONENTTYPE_SRC_FIRST + 2
'Private Const MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT = (MIXERLINE_COMPONENTTYPE_SRC_FIRST + 8)
Private Const MIXERCONTROL_CT_CLASS_FADER As Integer = &H50000000
Private Const MIXERCONTROL_CT_UNITS_UNSIGNED As Integer = &H30000
Private Const MIXERCONTROL_CT_CLASS_SWITCH As Integer = &H20000000
Private Const MIXERCONTROL_CT_UNITS_BOOLEAN As Integer = &H10000
Private Const MIXERCONTROL_CONTROLTYPE_BASS As Integer = (MIXERCONTROL_CONTROLTYPE_FADER + 2)
Private Const MIXERCONTROL_CONTROLTYPE_FADER As Integer = MIXERCONTROL_CT_CLASS_FADER Or MIXERCONTROL_CT_UNITS_UNSIGNED
Private Const MIXERCONTROL_CONTROLTYPE_VOLUME As Integer = MIXERCONTROL_CONTROLTYPE_FADER + 1
Private Const MIXERCONTROL_CONTROLTYPE_MUTE As Integer = (MIXERCONTROL_CONTROLTYPE_BOOLEAN + 2)
Private Const MIXERCONTROL_CONTROLTYPE_TREBLE As Integer = (MIXERCONTROL_CONTROLTYPE_FADER + 3)
Private Const MIXERCONTROL_CONTROLTYPE_EQUALIZER As Integer = (MIXERCONTROL_CONTROLTYPE_FADER + 4)
Private Const MIXERCONTROL_CONTROLTYPE_BOOLEAN As Integer = (MIXERCONTROL_CT_CLASS_SWITCH Or MIXERCONTROL_CT_UNITS_BOOLEAN)
#End Region
#Region " API Calls"
Private Declare Ansi Function mixerClose Lib "winmm.dll" (ByVal hmx As Integer) As Integer
Private Declare Ansi Function mixerGetControlDetailsA Lib "winmm.dll" (ByVal hmxobj As Integer, ByRef pmxcd As MIXERCONTROLDETAILS, ByVal fdwDetails As Integer) As Integer
Private Declare Ansi Function mixerGetDevCapsA Lib "winmm.dll" (ByVal uMxId As Integer, ByVal pmxcaps As MIXERCAPS, ByVal cbmxcaps As Integer) As Integer
Private Declare Ansi Function mixerGetID Lib "winmm.dll" (ByVal hmxobj As Integer, ByVal pumxID As Integer, ByVal fdwId As Integer) As Integer
Private Declare Ansi Function mixerGetLineControlsA Lib "winmm.dll" (ByVal hmxobj As Integer, ByRef pmxlc As MIXERLINECONTROLS, ByVal fdwControls As Integer) As Integer
Private Declare Ansi Function mixerGetLineInfoA Lib "winmm.dll" (ByVal hmxobj As Integer, ByRef pmxl As MIXERLINE, ByVal fdwInfo As Integer) As Integer
Private Declare Ansi Function mixerGetNumDevs Lib "winmm.dll" () As Integer
Private Declare Ansi Function mixerMessage Lib "winmm.dll" (ByVal hmx As Integer, ByVal uMsg As Integer, ByVal dwParam1 As Integer, ByVal dwParam2 As Integer) As Integer
Private Declare Ansi Function mixerOpen Lib "winmm.dll" (ByRef phmx As Integer, ByVal uMxId As Integer, ByVal dwCallback As Integer, ByVal dwInstance As Integer, ByVal fdwOpen As Integer) As Integer
Private Declare Ansi Function mixerSetControlDetails Lib "winmm.dll" (ByVal hmxobj As Integer, ByRef pmxcd As MIXERCONTROLDETAILS, ByVal fdwDetails As Integer) As Integer
Private Declare Function mixerGetLineInfo Lib "winmm.dll" Alias "mixerGetLineInfoA" (<MarshalAs(UnmanagedType.I4)> ByVal hmxobj As Integer, ByRef pmxl As MIXERLINE, ByVal fdwInfo As Integer) As Integer
Private Declare Function mixerGetLineControls Lib "winmm.dll" Alias "mixerGetLineControlsA" (<MarshalAs(UnmanagedType.I4)> ByVal hmxobj As Integer, ByRef pmxlc As MIXERLINECONTROLS, ByVal fdwControls As Integer) As Integer
#End Region
#Region " Structures"
Private Structure MIXERCAPS
Public wMid As Integer
Public wPid As Integer
Public vDriverVersion As Integer
<MarshalAs(UnmanagedType.ByValTStr, SizeConst:=MAXPNAMELEN)> Public szPname As String
Public fdwSupport As Integer
Public cDestinations As Integer
End Structure 'MIXERCAPS
_
<StructLayout(LayoutKind.Sequential)> _
Private Structure MIXERCONTROL
<FieldOffset(0)> Public cbStruct As Integer ' size in Byte of MIXERCONTROL
<FieldOffset(4)> Public dwControlID As Integer ' unique control id for mixer device
<FieldOffset(8)> Public dwControlType As Integer ' MIXERCONTROL_CONTROLTYPE_xxx
<FieldOffset(12)> Public fdwControl As Integer ' MIXERCONTROL_CONTROLF_xxx
<FieldOffset(16)> Public cMultipleItems As Integer ' if MIXERCONTROL_CONTROLF_MULTIPLE set
<FieldOffset(20), MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst:=MIXER_SHORT_NAME_CHARS)> Public szShortName As String ' * MIXER_SHORT_NAME_CHARS ' short name of control
<FieldOffset(36), MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst:=MIXER_LONG_NAME_CHARS)> Public szName As String ' * MIXER_LONG_NAME_CHARS ' Integer name of control
<FieldOffset(100)> Public lMinimum As Integer ' Minimum value
<FieldOffset(104)> Public lMaximum As Integer ' Maximum value
<FieldOffset(108), MarshalAs(UnmanagedType.ByValArray, SizeConst:=11, ArraySubType:=UnmanagedType.AsAny)> Public reserved() As Integer ' reserved structure space
End Structure
<StructLayout(LayoutKind.Sequential)> _
Private Structure MIXERCONTROLDETAILS
<FieldOffset(0)> Public cbStruct As Integer ' size in Byte of MIXERCONTROLDETAILS
<FieldOffset(4)> Public dwControlID As Integer ' control id to get/set details on
<FieldOffset(8)> Public cChannels As Integer ' number of channels in paDetails array
<FieldOffset(12)> Public item As Integer ' hwndOwner or cMultipleItems
<FieldOffset(16)> Public cbDetails As Integer ' size of _one_ details_XX struct
<FieldOffset(20)> Public paDetails As IntPtr ' pointer to array of details_XX structs
End Structure
<StructLayout(LayoutKind.Sequential)> _
Private Structure MIXERCONTROLDETAILS_UNSIGNED
<FieldOffset(0)> Public dwValue As Integer ' value of the control
End Structure
<StructLayout(LayoutKind.Sequential)> _
Private Structure MIXERLINE
<FieldOffset(0)> Public cbStruct As Integer ' size of MIXERLINE structure
<FieldOffset(4)> Public dwDestination As Integer ' zero based destination index
<FieldOffset(8)> Public dwSource As Integer ' zero based source index (if source)
<FieldOffset(12)> Public dwLineID As Integer ' unique line id for mixer device
<FieldOffset(16)> Public fdwLine As Integer ' state/information about line
<FieldOffset(20)> Public dwUser As Integer ' driver specific information
<FieldOffset(24)> Public dwComponentType As Integer ' component type line connects to
<FieldOffset(28)> Public cChannels As Integer ' number of channels line supports
<FieldOffset(32)> Public cConnections As Integer ' number of connections (possible)
<FieldOffset(36)> Public cControls As Integer ' number of controls at this line
<FieldOffset(40), MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst:=MIXER_SHORT_NAME_CHARS)> Public szShortName As String ' * MIXER_SHORT_NAME_CHARS
<FieldOffset(56), MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst:=MIXER_LONG_NAME_CHARS)> Public szName As String ' * MIXER_LONG_NAME_CHARS
<FieldOffset(120)> Public dwType As Integer
<FieldOffset(124)> Public dwDeviceID As Integer
<FieldOffset(128)> Public wMid As Integer
<FieldOffset(132)> Public wPid As Integer
<FieldOffset(136)> Public vDriverVersion As Integer
<FieldOffset(168), MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst:=MAXPNAMELEN)> Public szPname As String ' * MAXPNAMELEN
End Structure
<StructLayout(LayoutKind.Sequential)> _
Private Structure MIXERLINECONTROLS
<FieldOffset(0)> Public cbStruct As Integer ' size in Byte of MIXERLINECONTROLS
<FieldOffset(4)> Public dwLineID As Integer ' line id (from MIXERLINE.dwLineID)
<FieldOffset(8)> Public dwControl As Integer ' MIXER_GETLINECONTROLSF_ONEBYTYPE
<FieldOffset(12)> Public cControls As Integer ' count of controls pmxctrl points to
<FieldOffset(16)> Public cbmxctrl As Integer ' size in Byte of _one_ MIXERCONTROL
<FieldOffset(20)> Public pamxctrl As IntPtr ' pointer to first MIXERCONTROL array
End Structure
#End Region
Private Shared Function GetVolumeControl(ByVal hmixer As Integer, ByVal componentType As Integer, ByVal ctrlType As Integer, ByRef mxc As MIXERCONTROL, ByRef vCurrentVol As Integer) As Boolean
Dim mxlc As New MIXERLINECONTROLS
Dim mxl As New MIXERLINE
Dim pmxcd As New MIXERCONTROLDETAILS
Dim du As New MIXERCONTROLDETAILS_UNSIGNED
mxc = New MIXERCONTROL
Dim rc As Integer
Dim retValue As Boolean
vCurrentVol = -1
mxl.cbStruct = Marshal.SizeOf(mxl)
mxl.dwComponentType = componentType
rc = mixerGetLineInfoA(hmixer, mxl, MIXER_GETLINEINFOF_COMPONENTTYPE)
If MMSYSERR_NOERROR = rc Then
Dim sizeofMIXERCONTROL As Integer = 152
Dim ctrl As Integer = Marshal.SizeOf(GetType(MIXERCONTROL))
mxlc.pamxctrl = Marshal.AllocCoTaskMem(sizeofMIXERCONTROL)
mxlc.cbStruct = Marshal.SizeOf(mxlc)
mxlc.dwLineID = mxl.dwLineID
mxlc.dwControl = ctrlType
mxlc.cControls = 1
mxlc.cbmxctrl = sizeofMIXERCONTROL
' Allocate a buffer for the control
mxc.cbStruct = sizeofMIXERCONTROL
' Get the control
rc = mixerGetLineControlsA(hmixer, mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE)
If MMSYSERR_NOERROR = rc Then
retValue = True
' Copy the control into the destination structure
mxc = CType(Marshal.PtrToStructure(mxlc.pamxctrl, GetType(MIXERCONTROL)), MIXERCONTROL)
Else
retValue = False
End If
Dim sizeofMIXERCONTROLDETAILS As Integer = Marshal.SizeOf(GetType(MIXERCONTROLDETAILS))
Dim sizeofMIXERCONTROLDETAILS_UNSIGNED As Integer = Marshal.SizeOf(GetType(MIXERCONTROLDETAILS_UNSIGNED))
pmxcd.cbStruct = sizeofMIXERCONTROLDETAILS
pmxcd.dwControlID = mxc.dwControlID
pmxcd.paDetails = Marshal.AllocCoTaskMem(sizeofMIXERCONTROLDETAILS_UNSIGNED)
pmxcd.cChannels = 1
pmxcd.item = 0
pmxcd.cbDetails = sizeofMIXERCONTROLDETAILS_UNSIGNED
rc = mixerGetControlDetailsA(hmixer, pmxcd, MIXER_GETCONTROLDETAILSF_VALUE)
du = Marshal.PtrToStructure(pmxcd.paDetails, GetType(MIXERCONTROLDETAILS_UNSIGNED))
vCurrentVol = du.dwValue
Return retValue
End If
retValue = False
Return retValue
End Function 'GetVolumeControl
Private Shared Function SetVolumeControl(ByVal hmixer As Integer, ByVal mxc As MIXERCONTROL, ByVal volume As Integer) As Boolean
' This function sets the value for a volume control.
' Returns True if successful
Dim retValue As Boolean
Dim rc As Integer
Dim mxcd As New MIXERCONTROLDETAILS
Dim vol As New MIXERCONTROLDETAILS_UNSIGNED
mxcd.item = 0
mxcd.dwControlID = mxc.dwControlID
mxcd.cbStruct = Marshal.SizeOf(mxcd)
mxcd.cbDetails = Marshal.SizeOf(vol)
' Allocate a buffer for the control value buffer
mxcd.cChannels = 1
vol.dwValue = volume
' Copy the data into the control value buffer
mxcd.paDetails = Marshal.AllocCoTaskMem(Marshal.SizeOf(GetType(MIXERCONTROLDETAILS_UNSIGNED)))
Marshal.StructureToPtr(vol, mxcd.paDetails, False)
' Set the control value
rc = mixerSetControlDetails(hmixer, mxcd, MIXER_SETCONTROLDETAILSF_VALUE)
If MMSYSERR_NOERROR = rc Then
retValue = True
Else
retValue = False
End If
Return retValue
End Function 'SetVolumeControl
Public Function GetVolume() As Integer
Dim mixer As Integer
Dim volCtrl As New MIXERCONTROL
Dim currentVol As Integer
mixerOpen(mixer, 0, 0, 0, 0) 'Returns the mixer control
GetVolumeControl(mixer, MIXERLINE_COMPONENTTYPE_DST_SPEAKERS, MIXERCONTROL_CONTROLTYPE_VOLUME, volCtrl, currentVol)
mixerClose(mixer)
Return currentVol
End Function 'GetVolume
Public Function GetMax() As Integer
Dim mixer As Integer
Dim volCtrl As New MIXERCONTROL
Dim currentVol As Integer
mixerOpen(mixer, 0, 0, 0, 0)
Dim type As Integer = MIXERCONTROL_CONTROLTYPE_VOLUME
GetVolumeControl(mixer, MIXERLINE_COMPONENTTYPE_DST_SPEAKERS, type, volCtrl, currentVol)
mixerClose(mixer)
Return volCtrl.lMaximum
End Function 'Gets max volume
Public Function GetMuted() As String
Dim mixer As Integer
Dim volCtrl As New MIXERCONTROL
Dim Muted As Integer
mixerOpen(mixer, 0, 0, 0, 0)
Dim type As Integer = MIXERCONTROL_CONTROLTYPE_MUTE
GetVolumeControl(mixer, MIXERLINE_COMPONENTTYPE_DST_SPEAKERS, type, volCtrl, Muted)
mixerClose(mixer)
Return Muted
End Function 'GetMuted status
Public Sub SetVolume(ByVal vVolume As Integer)
Dim mixer As Integer
Dim volCtrl As New MIXERCONTROL
Dim currentVol As Integer
mixerOpen(mixer, 0, 0, 0, 0)
Dim type As Integer = MIXERCONTROL_CONTROLTYPE_VOLUME
GetVolumeControl(mixer, MIXERLINE_COMPONENTTYPE_DST_SPEAKERS, type, volCtrl, currentVol)
If vVolume > volCtrl.lMaximum Then
vVolume = volCtrl.lMaximum
End If
If vVolume < volCtrl.lMinimum Then
vVolume = volCtrl.lMinimum
End If
SetVolumeControl(mixer, volCtrl, vVolume)
GetVolumeControl(mixer, MIXERLINE_COMPONENTTYPE_DST_SPEAKERS, type, volCtrl, currentVol)
If vVolume <> currentVol Then
Throw New Exception("Cannot Set Volume")
Else
RaiseEvent VolumeChanged()
End If
mixerClose(mixer)
End Sub 'SetVolume
Public Sub SetMuted(ByVal boolMute As Boolean)
' This routine sets the volume setting of the current unit depending on the value passed through
Dim mixer As Integer
Dim volCtrl As New MIXERCONTROL
Dim lngReturn As Integer
Dim type As Integer = MIXERCONTROL_CONTROLTYPE_MUTE
Dim currentVol As Integer
' Obtain the hmixer struct
lngReturn = mixerOpen(mixer, 0, 0, 0, 0)
' Error check
If lngReturn <> 0 Then Exit Sub
' Obtain the volumne control object
GetVolumeControl(mixer, MIXERLINE_COMPONENTTYPE_DST_SPEAKERS, type, volCtrl, currentVol)
' Then set the volume
SetVolumeControl(mixer, volCtrl, boolMute)
mixerClose(mixer)
RaiseEvent MuteChanged()
End Sub 'Set the muted status
End Class
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