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