在进行多媒体软件开发时,经常要调整各种设备的音量和设置静音,本人编写了一个单元,四个函数,分别用于获取音量(GetVolume(DN))、设置音量(SetVolume(DN,Value))、获取静音(GetVolumeMute(DN))及设置静音(SetVolumeMute(DN,Value))。 unit funVolume; interface uses MMSystem, Dialogs; Type TDeviceName = (Master, Microphone, WaveOut, Synth); function GetVolume(DN:TDeviceName) : Word ; implementation //获取音量 // open the mixer // get line info if intRet = MMSYSERR_NOERROR then mxlc.pamxctrl := @mxc; if intRet = MMSYSERR_NOERROR then intRet := mixerGetControlDetails(hMix, @mxcd,MIXER_SETCONTROLDETAILSF_VALUE); Result := vol.dwValue ; if intRet <> MMSYSERR_NOERROR then //设置音量 // open the mixer // get line info if intRet = MMSYSERR_NOERROR then mxlc.pamxctrl := @mxc; if intRet = MMSYSERR_NOERROR then vol.dwValue := Value; intRet := mixerSetControlDetails(hMix, @mxcd,MIXER_SETCONTROLDETAILSF_VALUE); if intRet <> MMSYSERR_NOERROR then //获取静音 // open the mixer // mixerline info if intRet = MMSYSERR_NOERROR then // Get the mute control if intRet = MMSYSERR_NOERROR then // Get mute if mcdMute.fValue = 0 then Result:=false if intRet <> MMSYSERR_NOERROR then intRet := mixerClose(hMix); //设置静音 // open the mixer // mixerline info if intRet = MMSYSERR_NOERROR then // Get the mute control if intRet = MMSYSERR_NOERROR then // Set and UnSet mute if intRet <> MMSYSERR_NOERROR then intRet := mixerClose(hMix); end.
procedure SetVolume(DN:TDeviceName; Value:Word);
function GetVolumeMute(DN:TDeviceName) : Boolean;
procedure SetVolumeMute(DN:TDeviceName; Value:Boolean);
function GetVolume(DN:TDeviceName) : Word;
var
hMix: HMIXER;
mxlc: MIXERLINECONTROLS;
mxcd: TMIXERCONTROLDETAILS;
vol: TMIXERCONTROLDETAILS_UNSIGNED;
mxc: MIXERCONTROL;
mxl: TMixerLine;
intRet: Integer;
nMixerDevs: Integer;
begin
// Check if Mixer is available
nMixerDevs := mixerGetNumDevs();
if (nMixerDevs < 1) then
begin
Exit;
end;
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
if intRet = MMSYSERR_NOERROR then
begin
case DN of
Master : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
Microphone :
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
WaveOut : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT;
Synth : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER;
end;
mxl.cbStruct := SizeOf(mxl);
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
begin
FillChar(mxlc, SizeOf(mxlc),0);
mxlc.cbStruct := SizeOf(mxlc);
mxlc.dwLineID := mxl.dwLineID;
mxlc.dwControlType := MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.cControls := 1;
mxlc.cbmxctrl := SizeOf(mxc);
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);
begin
FillChar(mxcd, SizeOf(mxcd),0);
mxcd.dwControlID := mxc.dwControlID;
mxcd.cbStruct := SizeOf(mxcd);
mxcd.cMultipleItems := 0;
mxcd.cbDetails := SizeOf(Vol);
mxcd.paDetails := @vol;
mxcd.cChannels := 1;
ShowMessage(GetControlDetails Error);
end
else
ShowMessage(GetLineInfo Error);
end;
intRet := mixerClose(hMix);
end;
end;
procedure setVolume(DN:TDeviceName; Value : Word);
var
hMix: HMIXER;
mxlc: MIXERLINECONTROLS;
mxcd: TMIXERCONTROLDETAILS;
vol: TMIXERCONTROLDETAILS_UNSIGNED;
mxc: MIXERCONTROL;
mxl: TMixerLine;
intRet: Integer;
nMixerDevs: Integer;
begin
// Check if Mixer is available
nMixerDevs := mixerGetNumDevs();
if (nMixerDevs < 1) then
begin
Exit;
end;
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
if intRet = MMSYSERR_NOERROR then
begin
case DN of
Master : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
Microphone :
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
WaveOut : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT;
Synth : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER;
end;
mxl.cbStruct := SizeOf(mxl);
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
begin
FillChar(mxlc, SizeOf(mxlc),0);
mxlc.cbStruct := SizeOf(mxlc);
mxlc.dwLineID := mxl.dwLineID;
mxlc.dwControlType := MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.cControls := 1;
mxlc.cbmxctrl := SizeOf(mxc);
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);
begin
FillChar(mxcd, SizeOf(mxcd),0);
mxcd.dwControlID := mxc.dwControlID;
mxcd.cbStruct := SizeOf(mxcd);
mxcd.cMultipleItems := 0;
mxcd.cbDetails := SizeOf(Vol);
mxcd.paDetails := @vol;
mxcd.cChannels := 1;
ShowMessage(SetControlDetails Error);
end
else
ShowMessage(GetLineInfo Error);
end;
intRet := mixerClose(hMix);
end;
end;
function GetVolumeMute(DN:TDeviceName) : 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
nMixerDevs := mixerGetNumDevs();
if (nMixerDevs < 1) then
begin
Exit;
end;
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
if intRet = MMSYSERR_NOERROR then
begin
case DN of
Master : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
Microphone :
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
WaveOut : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT;
Synth : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER;
end;
mxl.cbStruct := SizeOf(mxl);
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
begin
FillChar(mxlc, SizeOf(mxlc),0);
mxlc.cbStruct := SizeOf(mxlc);
mxlc.dwLineID := mxl.dwLineID;
mxlc.dwControlType := MIXERCONTROL_CONTROLTYPE_MUTE;
mxlc.cControls := 1;
mxlc.cbmxctrl := SizeOf(mxc);
mxlc.pamxctrl := @mxc;
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);
begin
FillChar(mxcd, SizeOf(mxcd),0);
mxcd.cbStruct := SizeOf(TMIXERCONTROLDETAILS);
mxcd.dwControlID := mxc.dwControlID;
mxcd.cChannels := 1;
mxcd.cbDetails := SizeOf(MIXERCONTROLDETAILS_BOOLEAN);
mxcd.paDetails := @mcdMute;
intRet := mixerGetControlDetails(hMix, @mxcd, MIXER_SETCONTROLDETAILSF_VALUE);
else Result := True;
ShowMessage(SetControlDetails Error);
end
else
ShowMessage(GetLineInfo Error);
end;
end;
end;
procedure SetVolumeMute(DN:TDeviceName; Value: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
nMixerDevs := mixerGetNumDevs();
if (nMixerDevs < 1) then
begin
Exit;
end;
intRet := mixerOpen(@hMix, 0, 0, 0, 0);
if intRet = MMSYSERR_NOERROR then
begin
case DN of
Master : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
Microphone :
mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
WaveOut : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT;
Synth : mxl.dwComponentType := MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER;
end;
mxl.cbStruct := SizeOf(mxl);
intRet := mixerGetLineInfo(hMix, @mxl, MIXER_GETLINEINFOF_COMPONENTTYPE);
begin
FillChar(mxlc, SizeOf(mxlc),0);
mxlc.cbStruct := SizeOf(mxlc);
mxlc.dwLineID := mxl.dwLineID;
mxlc.dwControlType := MIXERCONTROL_CONTROLTYPE_MUTE;
mxlc.cControls := 1;
mxlc.cbmxctrl := SizeOf(mxc);
mxlc.pamxctrl := @mxc;
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);
begin
FillChar(mxcd, SizeOf(mxcd),0);
mxcd.cbStruct := SizeOf(TMIXERCONTROLDETAILS);
mxcd.dwControlID := mxc.dwControlID;
mxcd.cChannels := 1;
mxcd.cbDetails := SizeOf(MIXERCONTROLDETAILS_BOOLEAN);
mxcd.paDetails := @mcdMute;
mcdMute.fValue := Ord(Value);
intRet := mixerSetControlDetails(hMix, @mxcd, MIXER_SETCONTROLDETAILSF_VALUE);
ShowMessage(SetControlDetails Error);
end
else
ShowMessage(GetLineInfo Error);
end;
end;
end;