音量調(diào)節(jié)及靜音

2019-11-18 18:37:31

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在進行多媒體軟件開發(fā)時，經(jīng)常要調(diào)整各種設(shè)備的音量和設(shè)置靜音，本人編寫了一個單元，四個函數(shù)，分別用于獲取音量（GetVolume(DN))、設(shè)置音量(SetVolume(DN,Value))、獲取靜音（GetVolumeMute(DN)）及設(shè)置靜音（SetVolumeMute(DN,Value)）。

unit funVolume;

interface

uses MMSystem, Dialogs;

Type TDeviceName = (Master, Microphone, WaveOut, Synth);

function GetVolume(DN:TDeviceName) : Word ;
PRocedure SetVolume(DN:TDeviceName; Value:Word);
function GetVolumeMute(DN:TDeviceName) : Boolean;
procedure SetVolumeMute(DN:TDeviceName; Value:Boolean);

implementation

//獲取音量
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;

// open the mixer
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);

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

   if intRet = MMSYSERR_NOERROR then
   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);

mxlc.pamxctrl := @mxc;
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);

     if intRet = MMSYSERR_NOERROR then
     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;

intRet := mixerGetControlDetails(hMix, @mxcd,MIXER_SETCONTROLDETAILSF_VALUE);

Result := vol.dwValue ;

       if intRet <> MMSYSERR_NOERROR then
         ShowMessage('GetControlDetails Error');
     end
     else
       ShowMessage('GetLineInfo Error');
   end;
   intRet := mixerClose(hMix);
end;
end;

//設(shè)置音量
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;

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

mxlc.pamxctrl := @mxc;
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);

vol.dwValue := Value;

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;

//獲取靜音
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;

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

   if intRet = MMSYSERR_NOERROR then
   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;

// Get the mute control
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);

     if intRet = MMSYSERR_NOERROR then
     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;

// Get mute
intRet := mixerGetControlDetails(hMix, @mxcd, MIXER_SETCONTROLDETAILSF_VALUE);

if mcdMute.fValue = 0 then Result:=false
else Result := True;

       if intRet <> MMSYSERR_NOERROR then
         ShowMessage('SetControlDetails Error');
     end
     else
       ShowMessage('GetLineInfo Error');
   end;

intRet := mixerClose(hMix);
end;
end;

//設(shè)置靜音
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;

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

   if intRet = MMSYSERR_NOERROR then
   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;

// Get the mute control
intRet := mixerGetLineControls(hMix, @mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);

       // Set and UnSet mute
       mcdMute.fValue := Ord(Value);
       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;

end.

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