Как изменить уровень громкости микрофона



Автор: http://www.swissdelphicenter.ch

uses
MMSystem;
// Setzt die Lautstarke fur das Mikrofon
// Set the volume for the microphone
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
// Uberprufen, 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);
// get line info
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
if intRet = MMSYSERR_NOERROR then
begin
ZeroMemory(@mxlc, SizeOf(mxlc));
mxlc.cbStruct := SizeOf(mxlc);
mxlc.dwLineID := mxl.dwLineID;
mxlc.dwControlType := MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.cControls := 1;
mxlc.cbmxctrl := SizeOf(mxc);
mxlc.pamxctrl := @mxc;
intRet := mixerGetLineControls(hMix, @mxlc,
MIXER_GETLINECONTROLSF_ONEBYTYPE);
if intRet = MMSYSERR_NOERROR then
begin
{
// Microphone Name
Label1.Caption := mxlc.pamxctrl.szName;
// Min/Max Volume
Label2.Caption := IntToStr(mxc.Bounds.dwMinimum) + '->' + IntToStr(mxc.Bounds.dwMaximum);
}
ZeroMemory(@mxcd, SizeOf(mxcd));
mxcd.dwControlID := mxc.dwControlID;
mxcd.cbStruct := SizeOf(mxcd);
mxcd.cMultipleItems := 0;
mxcd.cbDetails := SizeOf(Vol);
mxcd.paDetails := @vol;
mxcd.cChannels := 1;
// vol.dwValue := mxlc.pamxctrl.Bounds.lMinimum; Set min. Volume / Minimum setzen
// vol.dwValue := mxlc.pamxctrl.Bounds.lMaximum; Set max. Volume / Maximum setzen
vol.dwValue := bValue;
intRet := mixerSetControlDetails(hMix, @mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);
if intRet <> MMSYSERR_NOERROR then
ShowMessage('SetControlDetails Error');
end
else
ShowMessage('GetLineInfo Error');
end;
intRet := mixerClose(hMix);
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
SetMicrophoneVolume(30000);
end;
{********************************************************}
// Enable/disable "Mute Microphone Volume"
// Ton fur Mikrofon ein/ausschalten
function SetMicrophoneVolumeMute(bMute: Boolean): Boolean;
var
hMix: HMIXER;
mxlc: MIXERLINECONTROLS;
mxcd: TMIXERCONTROLDETAILS;
vol: TMIXERCONTROLDETAILS_UNSIGNED;
mxc: MIXERCONTROL;
mxl: TMixerLine;
intRet: Integer;
nMixerDevs: Integer;
mcdMute: MIXERCONTROLDETAILS_BOOLEAN;
begin
// Check if Mixer is available
// Uberprufen, ob ein Mixer vorhanden ist
nMixerDevs := mixerGetNumDevs();
if (nMixerDevs < 1) then
begin
Exit;
end;
// open the mixer
// Mixer offnen
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
if intRet = MMSYSERR_NOERROR then
begin
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
mxl.cbStruct := SizeOf(mxl);
// mixerline info
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
if intRet = MMSYSERR_NOERROR then
begin
ZeroMemory(@mxlc, SizeOf(mxlc));
mxlc.cbStruct := SizeOf(mxlc);
mxlc.dwLineID := mxl.dwLineID;
mxlc.dwControlType := MIXERCONTROL_CONTROLTYPE_MUTE;
mxlc.cControls := 1;
mxlc.cbmxctrl := SizeOf(mxc);
mxlc.pamxctrl := @mxc;
// Get the mute control
// Mute control ermitteln
intRet := mixerGetLineControls(hMix, @mxlc,
MIXER_GETLINECONTROLSF_ONEBYTYPE);
if intRet = MMSYSERR_NOERROR then
begin
ZeroMemory(@mxcd, SizeOf(mxcd));
mxcd.cbStruct := SizeOf(TMIXERCONTROLDETAILS);
mxcd.dwControlID := mxc.dwControlID;
mxcd.cChannels := 1;
mxcd.cbDetails := SizeOf(MIXERCONTROLDETAILS_BOOLEAN);
mxcd.paDetails := @mcdMute;
mcdMute.fValue := Ord(bMute);
// set, unset mute
// Stumsschalten ein/aus
intRet := mixerSetControlDetails(hMix, @mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);
{
mixerGetControlDetails(hMix, @mxcd,
MIXER_GETCONTROLDETAILSF_VALUE);
Result := Boolean(mcdMute.fValue);
}
Result := intRet = MMSYSERR_NOERROR;
if intRet <> MMSYSERR_NOERROR then
ShowMessage('SetControlDetails Error');
end
else
ShowMessage('GetLineInfo Error');
end;
intRet := mixerClose(hMix);
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
SetMicrophoneVolumeMute(False);
end;
{********************************************************}
// Enable/disable "Mute" for several mixer line sources.
uses
MMSystem;
type
TMixerLineSourceType = (lsDigital, lsLine, lsMicrophone, lsCompactDisk,
lsTelephone,
lsWaveOut, lsAuxiliary, lsAnalog, lsLast);
function SetMixerLineSourceMute(AMixerLineSourceType: TMixerLineSourceType;
bMute: Boolean): Boolean;
var
hMix: HMIXER;
mxlc: MIXERLINECONTROLS;
mxcd: TMIXERCONTROLDETAILS;
vol: TMIXERCONTROLDETAILS_UNSIGNED;
mxc: MIXERCONTROL;
mxl: TMixerLine;
intRet: Integer;
nMixerDevs: Integer;
mcdMute: MIXERCONTROLDETAILS_BOOLEAN;
begin
Result := False;
// Check if Mixer is available
// Uberprufen, ob ein Mixer vorhanden ist
nMixerDevs := mixerGetNumDevs();
if (nMixerDevs < 1) then
begin
Exit;
end;
// open the mixer
// Mixer offnen
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
if intRet = MMSYSERR_NOERROR then
begin
ZeroMemory(@mxl, SizeOf(mxl));
case AMixerLineSourceType of
lsDigital: mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_DIGITAL;
lsLine: mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_LINE;
lsMicrophone: mxl.dwComponentType :=
MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
lsCompactDisk: mxl.dwComponentType :=
MIXERLINE_COMPONENTTYPE_SRC_COMPACTDISC;
lsTelephone: mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_TELEPHONE;
lsWaveOut: mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT;
lsAuxiliary: mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_AUXILIARY;
lsAnalog: mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_ANALOG;
lsLast: mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_LAST;
end;
// mixerline info
mxl.cbStruct := SizeOf(mxl);
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
if intRet = MMSYSERR_NOERROR then
begin
ZeroMemory(@mxlc, SizeOf(mxlc));
mxlc.cbStruct := SizeOf(mxlc);
mxlc.dwLineID := mxl.dwLineID;
mxlc.dwControlType := MIXERCONTROL_CONTROLTYPE_MUTE;
mxlc.cControls := 1;
mxlc.cbmxctrl := SizeOf(mxc);
mxlc.pamxctrl := @mxc;
// Get the mute control
// Mute control ermitteln
intRet := mixerGetLineControls(hMix, @mxlc,
MIXER_GETLINECONTROLSF_ONEBYTYPE);
if intRet = MMSYSERR_NOERROR then
begin
ZeroMemory(@mxcd, SizeOf(mxcd));
mxcd.cbStruct := SizeOf(TMIXERCONTROLDETAILS);
mxcd.dwControlID := mxc.dwControlID;
mxcd.cChannels := 1;
mxcd.cbDetails := SizeOf(MIXERCONTROLDETAILS_BOOLEAN);
mxcd.paDetails := @mcdMute;
mcdMute.fValue := Ord(bMute);
// set, unset mute
// Stumsschalten ein/aus
intRet := mixerSetControlDetails(hMix, @mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);
{
mixerGetControlDetails(hMix, @mxcd, IXER_GETCONTROLDETAILSF_VALUE);
Result := Boolean(mcdMute.fValue);
}
Result := intRet = MMSYSERR_NOERROR;
if intRet <> MMSYSERR_NOERROR then
ShowMessage('SetControlDetails Error');
end
else
ShowMessage('GetLineInfo Error');
end;
intRet := mixerClose(hMix);
end;
end;
// Example Call; Beispielaufruf:
procedure TForm1.Button1Click(Sender: TObject);
begin
// Ton ausschalten
SetMixerLineSourceMute(lsLine, True);
end;

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