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'This project needs a module and a form
'The form must contain two labels, two progressbars, a timer and a checkbox
'Paste this code into the form
Dim hmixer As Long ' mixer handle
Dim inputVolCtrl As MIXERCONTROL ' waveout volume control
Dim outputVolCtrl As MIXERCONTROL ' microphone volume control
Dim rc As Long ' return code
Dim ok As Boolean ' boolean return code
Dim mxcd As MIXERCONTROLDETAILS ' control info
Dim vol As MIXERCONTROLDETAILS_SIGNED ' control's signed value
Dim volume As Long ' volume value
Dim volHmem As Long ' handle to volume memory
Private Sub Form_Load()
'KPD-Team 1999
'URL: http://www.allapi.net/
'E-Mail: KPDTeam@Allapi.net
Me.ScaleMode = vbTwips
Me.Caption = "Volume meter"
Label1.Move 0, 0
Label1.AutoSize = True
Label1.Caption = "Input level"
Label2.Move 0, 4 * Label1.Height
Label2.AutoSize = True
Label2.Caption = "Output level"
ProgressBar1.Move Label1.Width * 2, 0, 3375
ProgressBar2.Move Label1.Width * 2, Label2.Top, 3375
Check1.Move ProgressBar1.Left, ProgressBar1.Height
Check1.Caption = "Get Input"
Me.Move Me.Left, Me.Top, ProgressBar1.Width + ProgressBar1.Left + 10 * Screen.TwipsPerPixelX, ProgressBar2.Top + ProgressBar2.Height + 30 * Screen.TwipsPerPixelY
Timer1.Interval = 50
Timer1.Enabled = True
' Open the mixer specified by DEVICEID
rc = mixerOpen(hmixer, DEVICEID, 0, 0, 0)
If ((MMSYSERR_NOERROR <> rc)) Then
MsgBox "Couldn't open the mixer."
Exit Sub
End If
' Get the input volume meter
ok = GetControl(hmixer, MIXERLINE_COMPONENTTYPE_DST_WAVEIN, MIXERCONTROL_CONTROLTYPE_PEAKMETER, inputVolCtrl)
If (ok <> True) Then
ok = GetControl(hmixer, MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE, MIXERCONTROL_CONTROLTYPE_PEAKMETER, inputVolCtrl)
End If
If (ok = True) Then
ProgressBar1.Min = 0
ProgressBar1.Max = inputVolCtrl.lMaximum
Else
ProgressBar1.Enabled = False
MsgBox "Couldn't get wavein meter"
End If
' Get the output volume meter
ok = GetControl(hmixer, MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT, MIXERCONTROL_CONTROLTYPE_PEAKMETER, outputVolCtrl)
If (ok = True) Then
ProgressBar2.Min = 0
ProgressBar2.Max = outputVolCtrl.lMaximum
Else
ProgressBar2.Enabled = False
MsgBox "Couldn't get waveout meter"
End If
' Initialize mixercontrol structure
mxcd.cbStruct = Len(mxcd)
volHmem = GlobalAlloc(&H0, Len(volume)) ' Allocate a buffer for the volume value
mxcd.paDetails = GlobalLock(volHmem)
mxcd.cbDetails = Len(volume)
mxcd.cChannels = 1
End Sub
Private Sub Check1_Click()
If (Check1.Value = 1) Then
StartInput ' Start receiving audio input
Else
StopInput ' Stop receiving audio input
End If
End Sub
Private Sub Timer1_Timer()
On Error Resume Next
' Process sound buffer if recording
If (fRecording) Then
For i = 0 To (NUM_BUFFERS - 1)
If inHdr(i).dwFlags And WHDR_DONE Then
rc = waveInAddBuffer(hWaveIn, inHdr(i), Len(inHdr(i)))
End If
Next
End If
' Get the current input level
If (ProgressBar1.Enabled = True) Then
mxcd.dwControlID = inputVolCtrl.dwControlID
mxcd.item = inputVolCtrl.cMultipleItems
rc = mixerGetControlDetails(hmixer, mxcd, MIXER_GETCONTROLDETAILSF_VALUE)
CopyStructFromPtr volume, mxcd.paDetails, Len(volume)
If (volume < 0) Then
volume = -volume
End If
ProgressBar1.Value = volume
End If
' Get the current output level
If (ProgressBar2.Enabled = True) Then
mxcd.dwControlID = outputVolCtrl.dwControlID
mxcd.item = outputVolCtrl.cMultipleItems
rc = mixerGetControlDetails(hmixer, mxcd, MIXER_GETCONTROLDETAILSF_VALUE)
CopyStructFromPtr volume, mxcd.paDetails, Len(volume)
If (volume < 0) Then volume = -volume
ProgressBar2.Value = volume
End If
End Sub
Private Sub Form_Unload(Cancel As Integer)
If (fRecording = True) Then
StopInput
End If
GlobalFree volHmem
End Sub
'Paste this code into the module
Public Const CALLBACK_FUNCTION = &H30000
Public Const MM_WIM_DATA = &H3C0
Public Const WHDR_DONE = &H1 ' done bit
Public Const GMEM_FIXED = &H0 ' Global Memory Flag used by GlobalAlloc functin
Type WAVEHDR
lpData As Long
dwBufferLength As Long
dwBytesRecorded As Long
dwUser As Long
dwFlags As Long
dwLoops As Long
lpNext As Long
Reserved As Long
End Type
Type WAVEINCAPS
wMid As Integer
wPid As Integer
vDriverVersion As Long
szPname As String * 32
dwFormats As Long
wChannels As Integer
End Type
Type WAVEFORMAT
wFormatTag As Integer
nChannels As Integer
nSamplesPerSec As Long
nAvgBytesPerSec As Long
nBlockAlign As Integer
wBitsPerSample As Integer
cbSize As Integer
End Type
Declare Function waveInOpen Lib "winmm.dll" (lphWaveIn As Long, ByVal uDeviceID As Long, lpFormat As WAVEFORMAT, ByVal dwCallback As Long, ByVal dwInstance As Long, ByVal dwFlags As Long) As Long
Declare Function waveInPrepareHeader Lib "winmm.dll" (ByVal hWaveIn As Long, lpWaveInHdr As WAVEHDR, ByVal uSize As Long) As Long
Declare Function waveInReset Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Declare Function waveInStart Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Declare Function waveInStop Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Declare Function waveInUnprepareHeader Lib "winmm.dll" (ByVal hWaveIn As Long, lpWaveInHdr As WAVEHDR, ByVal uSize As Long) As Long
Declare Function waveInClose Lib "winmm.dll" (ByVal hWaveIn As Long) As Long
Declare Function waveInGetDevCaps Lib "winmm.dll" Alias "waveInGetDevCapsA" (ByVal uDeviceID As Long, lpCaps As WAVEINCAPS, ByVal uSize As Long) As Long
Declare Function waveInGetNumDevs Lib "winmm.dll" () As Long
Declare Function waveInGetErrorText Lib "winmm.dll" Alias "waveInGetErrorTextA" (ByVal err As Long, ByVal lpText As String, ByVal uSize As Long) As Long
Declare Function waveInAddBuffer Lib "winmm.dll" (ByVal hWaveIn As Long, lpWaveInHdr As WAVEHDR, ByVal uSize As Long) As Long
Public Const MMSYSERR_NOERROR = 0
Public Const MAXPNAMELEN = 32
Public Const MIXER_LONG_NAME_CHARS = 64
Public Const MIXER_SHORT_NAME_CHARS = 16
Public Const MIXER_GETLINEINFOF_COMPONENTTYPE = &H3&
Public Const MIXER_GETCONTROLDETAILSF_VALUE = &H0&
Public Const MIXER_GETLINECONTROLSF_ONEBYTYPE = &H2&
Public Const MIXERLINE_COMPONENTTYPE_DST_FIRST = &H0&
Public Const MIXERLINE_COMPONENTTYPE_SRC_FIRST = &H1000&
Public Const MIXERLINE_COMPONENTTYPE_DST_SPEAKERS = (MIXERLINE_COMPONENTTYPE_DST_FIRST + 4)
Public Const MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE = (MIXERLINE_COMPONENTTYPE_SRC_FIRST + 3)
Public Const MIXERLINE_COMPONENTTYPE_SRC_LINE = (MIXERLINE_COMPONENTTYPE_SRC_FIRST + 2)
Public Const MIXERCONTROL_CT_CLASS_FADER = &H50000000
Public Const MIXERCONTROL_CT_UNITS_UNSIGNED = &H30000
Public Const MIXERCONTROL_CT_UNITS_SIGNED = &H20000
Public Const MIXERCONTROL_CT_CLASS_METER = &H10000000
Public Const MIXERCONTROL_CT_SC_METER_POLLED = &H0&
Public Const MIXERCONTROL_CONTROLTYPE_FADER = (MIXERCONTROL_CT_CLASS_FADER Or MIXERCONTROL_CT_UNITS_UNSIGNED)
Public Const MIXERCONTROL_CONTROLTYPE_VOLUME = (MIXERCONTROL_CONTROLTYPE_FADER + 1)
Public Const MIXERLINE_COMPONENTTYPE_DST_WAVEIN = (MIXERLINE_COMPONENTTYPE_DST_FIRST + 7)
Public Const MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT = (MIXERLINE_COMPONENTTYPE_SRC_FIRST + 8)
Public Const MIXERCONTROL_CONTROLTYPE_SIGNEDMETER = (MIXERCONTROL_CT_CLASS_METER Or MIXERCONTROL_CT_SC_METER_POLLED Or MIXERCONTROL_CT_UNITS_SIGNED)
Public Const MIXERCONTROL_CONTROLTYPE_PEAKMETER = (MIXERCONTROL_CONTROLTYPE_SIGNEDMETER + 1)
Declare Function mixerClose Lib "winmm.dll" (ByVal hmx As Long) As Long
Declare Function mixerGetControlDetails Lib "winmm.dll" Alias "mixerGetControlDetailsA" (ByVal hmxobj As Long, pmxcd As MIXERCONTROLDETAILS, ByVal fdwDetails As Long) As Long
Declare Function mixerGetDevCaps Lib "winmm.dll" Alias "mixerGetDevCapsA" (ByVal uMxId As Long, ByVal pmxcaps As MIXERCAPS, ByVal cbmxcaps As Long) As Long
Declare Function mixerGetID Lib "winmm.dll" (ByVal hmxobj As Long, pumxID As Long, ByVal fdwId As Long) As Long
Declare Function mixerGetLineInfo Lib "winmm.dll" Alias "mixerGetLineInfoA" (ByVal hmxobj As Long, pmxl As MIXERLINE, ByVal fdwInfo As Long) As Long
Declare Function mixerGetLineControls Lib "winmm.dll" Alias "mixerGetLineControlsA" (ByVal hmxobj As Long, pmxlc As MIXERLINECONTROLS, ByVal fdwControls As Long) As Long
Declare Function mixerGetNumDevs Lib "winmm.dll" () As Long
Declare Function mixerMessage Lib "winmm.dll" (ByVal hmx As Long, ByVal uMsg As Long, ByVal dwParam1 As Long, ByVal dwParam2 As Long) As Long
Declare Function mixerOpen Lib "winmm.dll" (phmx As Long, ByVal uMxId As Long, ByVal dwCallback As Long, ByVal dwInstance As Long, ByVal fdwOpen As Long) As Long
Declare Function mixerSetControlDetails Lib "winmm.dll" (ByVal hmxobj As Long, pmxcd As MIXERCONTROLDETAILS, ByVal fdwDetails As Long) As Long
Declare Sub CopyStructFromPtr Lib "kernel32" Alias "RtlMoveMemory" (struct As Any, ByVal ptr As Long, ByVal cb As Long)
Declare Sub CopyPtrFromStruct Lib "kernel32" Alias "RtlMoveMemory" (ByVal ptr As Long, struct As Any, ByVal cb As Long)
Declare Function GlobalAlloc Lib "kernel32" (ByVal wFlags As Long, ByVal dwBytes As Long) As Long
Declare Function GlobalLock Lib "kernel32" (ByVal hmem As Long) As Long
Declare Function GlobalFree Lib "kernel32" (ByVal hmem As Long) As Long
Type MIXERCAPS
wMid As Integer
wPid As Integer
vDriverVersion As Long
szPname As String * MAXPNAMELEN
fdwSupport As Long
cDestinations As Long
End Type
Type MIXERCONTROL
cbStruct As Long
dwControlID As Long
dwControlType As Long
fdwControl As Long
cMultipleItems As Long
szShortName As String * MIXER_SHORT_NAME_CHARS
szName As String * MIXER_LONG_NAME_CHARS
lMinimum As Long
lMaximum As Long
Reserved(10) As Long
End Type
Type MIXERCONTROLDETAILS
cbStruct As Long
dwControlID As Long
cChannels As Long
item As Long
cbDetails As Long
paDetails As Long
End Type
Type MIXERCONTROLDETAILS_SIGNED
lValue As Long
End Type
Type MIXERLINE
cbStruct As Long
dwDestination As Long
dwSource As Long
dwLineID As Long
fdwLine As Long
dwUser As Long
dwComponentType As Long
cChannels As Long
cConnections As Long
cControls As Long
szShortName As String * MIXER_SHORT_NAME_CHARS
szName As String * MIXER_LONG_NAME_CHARS
dwType As Long
dwDeviceID As Long
wMid As Integer
wPid As Integer
vDriverVersion As Long
szPname As String * MAXPNAMELEN
End Type
Type MIXERLINECONTROLS
cbStruct As Long
dwLineID As Long
dwControl As Long
cControls As Long
cbmxctrl As Long
pamxctrl As Long
End Type
Public i As Integer, j As Integer, rc As Long, msg As String * 200, hWaveIn As Long
Public Const NUM_BUFFERS = 2
Public format As WAVEFORMAT, hmem(NUM_BUFFERS) As Long, inHdr(NUM_BUFFERS) As WAVEHDR
Public Const BUFFER_SIZE = 8192
Public Const DEVICEID = 0
Public fRecording As Boolean
Function GetControl(ByVal hmixer As Long, ByVal componentType As Long, ByVal ctrlType As Long, ByRef mxc As MIXERCONTROL) As Boolean
' This function attempts to obtain a mixer control. Returns True if successful.
Dim mxlc As MIXERLINECONTROLS
Dim mxl As MIXERLINE
Dim hmem As Long
Dim rc As Long
mxl.cbStruct = Len(mxl)
mxl.dwComponentType = componentType
' Obtain a line corresponding to the component type
rc = mixerGetLineInfo(hmixer, mxl, MIXER_GETLINEINFOF_COMPONENTTYPE)
If (MMSYSERR_NOERROR = rc) Then
mxlc.cbStruct = Len(mxlc)
mxlc.dwLineID = mxl.dwLineID
mxlc.dwControl = ctrlType
mxlc.cControls = 1
mxlc.cbmxctrl = Len(mxc)
' Allocate a buffer for the control
'hmem = GlobalAlloc(&H40, Len(mxc))
hmem = GlobalAlloc(GMEM_FIXED, Len(mxc))
mxlc.pamxctrl = GlobalLock(hmem)
mxc.cbStruct = Len(mxc)
' Get the control
rc = mixerGetLineControls(hmixer, mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE)
If (MMSYSERR_NOERROR = rc) Then
GetControl = True
' Copy the control into the destination structure
CopyStructFromPtr mxc, mxlc.pamxctrl, Len(mxc)
Else
GetControl = False
End If
GlobalFree (hmem)
Exit Function
End If
GetControl = False
End Function
' Function to process the wave recording notifications.
Sub waveInProc(ByVal hwi As Long, ByVal uMsg As Long, ByVal dwInstance As Long, ByRef hdr As WAVEHDR, ByVal dwParam2 As Long)
If (uMsg = MM_WIM_DATA) Then
If fRecording Then
rc = waveInAddBuffer(hwi, hdr, Len(hdr))
End If
End If
End Sub
' This function starts recording from the soundcard. The soundcard must be recording in order to
' monitor the input level. Without starting the recording from this application, input level
' can still be monitored if another application is recording audio
Function StartInput() As Boolean
If fRecording Then
StartInput = True
Exit Function
End If
format.wFormatTag = 1
format.nChannels = 1
format.wBitsPerSample = 8
format.nSamplesPerSec = 8000
format.nBlockAlign = format.nChannels * format.wBitsPerSample / 8
format.nAvgBytesPerSec = format.nSamplesPerSec * format.nBlockAlign
format.cbSize = 0
For i = 0 To NUM_BUFFERS - 1
hmem(i) = GlobalAlloc(&H40, BUFFER_SIZE)
inHdr(i).lpData = GlobalLock(hmem(i))
inHdr(i).dwBufferLength = BUFFER_SIZE
inHdr(i).dwFlags = 0
inHdr(i).dwLoops = 0
Next
rc = waveInOpen(hWaveIn, DEVICEID, format, 0, 0, 0)
If rc <> 0 Then
waveInGetErrorText rc, msg, Len(msg)
MsgBox msg
StartInput = False
Exit Function
End If
For i = 0 To NUM_BUFFERS - 1
rc = waveInPrepareHeader(hWaveIn, inHdr(i), Len(inHdr(i)))
If (rc <> 0) Then
waveInGetErrorText rc, msg, Len(msg)
MsgBox msg
End If
Next
For i = 0 To NUM_BUFFERS - 1
rc = waveInAddBuffer(hWaveIn, inHdr(i), Len(inHdr(i)))
If (rc <> 0) Then
waveInGetErrorText rc, msg, Len(msg)
MsgBox msg
End If
Next
fRecording = True
rc = waveInStart(hWaveIn)
StartInput = True
End Function
' Stop receiving audio input on the soundcard
Sub StopInput()
fRecording = False
waveInReset hWaveIn
waveInStop hWaveIn
For i = 0 To NUM_BUFFERS - 1
waveInUnprepareHeader hWaveIn, inHdr(i), Len(inHdr(i))
GlobalFree hmem(i)
Next
waveInClose hWaveIn
End Sub
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