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...set the volume for the microphone/ mute it (enhanced)?
Autor: SilentScope(LT)
Homepage: http://www.gvt.lt/sveikinimas
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Tip Rating (17):  
     


{*********************************************************************

Thomas Stutz in
   http://www.swissdelphicenter.ch/torry/showcode.php?id=1204
showed some useful peace of code how to take control of mixer lines.

I would like to add some more information about taking control of the
!!! PLAYBACK or RECORD line !!!!

*********************************************************************}

// see the {*} marked lines in the SetMicrophoneVolume function

function SetMicrophoneVolume(bValue: Word): Boolean;
var                          {0..65535}
  
hMix: HMIXER;
  mxlc: MIXERLINECONTROLS;
  mxcd: TMIXERCONTROLDETAILS;
  vol: TMIXERCONTROLDETAILS_UNSIGNED;
  mxc: MIXERCONTROL;
  mxl: TMixerLine;
  intRet: Integer;
  nMixerDevs: Integer;
begin
  
// Check if Mixer is available
  // Überprüfen, ob ein Mixer vorhanden
  
nMixerDevs := mixerGetNumDevs();
  if (nMixerDevs < 1) then
  begin
    
Exit;
  end;

  // open the mixer
  
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
  if intRet = MMSYSERR_NOERROR then
  begin
    
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
    mxl.cbStruct        := SizeOf(mxl);

    {*}    // this option will tell the compiler which line destination to take:
    {*}    // 0 - PLAYBACK destination
    {*}    // 1 - RECORD destination
    {*}    // this time the compiler will take control of recording microphone line
    {*}    
mxl.dwDestination := 1;


    // get line info
    
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);

    //...
  
end;
end;

//...


 

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