mixerSetControlDetails
auxoutsetvolume 是控制CD音量的
waveOutSetVolume 是控制波形的
midiOutSetVolume 是控制FM或者是synthesizerunit Volume; interface uses windows,mmsystem; type
Tvolume=record
left,right:word; // 取值范围 0--65535
end; procedure fillstruct(control:PMixerControl;var Cdetails:tMIXERCONTROLDETAILS);
function getpeak(control:PMixerControl;var peak:integer):boolean;
function setvolume(control:Pmixercontrol; volume:Tvolume):boolean;
function getvolume(control:Pmixercontrol; volume:Tvolume):boolean; var
mcontrols:array of array of array of PMixerControl; //mixer的数组,单声卡可以不用
fmixerhandle:HMIXER; //mixer的句柄 implementation procedure fillstruct(control:PMixerControl;var Cdetails:tMIXERCONTROLDETAILS);
begin
Cdetails.cbStruct:=sizeof(cdetails);
cdetails.dwControlID:=Control.dwControlID;
cdetails.cbDetails:=sizeof(integer);
cdetails.hwndOwner:=0;
end; function getpeak(control:PMixerControl;var peak:integer):boolean;
var
details:TMixerControlDetailsSigned;
cdetails:tMIXERCONTROLDETAILS;
begin
Result:=false;
if control.dwControlType<> mixercontrol_controltype_peakmeter then exit;
cdetails.cChannels:=1;
cdetails.paDetails:=@details;
fillstruct(control,cdetails);
result:=mixerGetControlDetails(fmixerhandle,@cdetails,MIXER_GETCONTROLDETAILSF_VALUE)=0;
end; function setvolume(control:Pmixercontrol; volume:Tvolume):boolean;
var
details:array[0..30] of integer;
cdetails:tMIXERCONTROLDETAILS;
begin
fillstruct(control,cdetails);
cdetails.cChannels:=2;
cdetails.paDetails:=@details;
details[0]:=volume.left;
details[1]:=volume.right;
result:=mixerSetControlDetails(fmixerhandle,@cdetails,MIXER_GETCONTROLDETAILSF_VALUE)=0;
volume.left:=details[0];
volume.right:=details[1];
end; function getvolume(control:Pmixercontrol; volume:Tvolume):boolean;
var
details:array[0..30] of integer;
cdetails:tMIXERCONTROLDETAILS;
begin
fillstruct(control,cdetails);
cdetails.cChannels:=2;
cdetails.paDetails:=@details;
result:=mixerGetControlDetails(fmixerhandle,@cdetails,MIXER_GETCONTROLDETAILSF_VALUE)=0;
volume.left:=details[0];
volume.right:=details[1];
end; end. // 调用方法:
procedure TForm1.Button1Click(Sender: TObject);
var s : Tvolume;
kz : Pmixercontrol;
begin
new(kz); //<------------ 此处一定要分配内存
kz.dwControlID := 0;
s.left := 0;
s.right := 0;
try
setvolume(kz,s);
except
end;
freemem(kz);
end;
auxoutsetvolume 是控制CD音量的
waveOutSetVolume 是控制波形的
midiOutSetVolume 是控制FM或者是synthesizerunit Volume; interface uses windows,mmsystem; type
Tvolume=record
left,right:word; // 取值范围 0--65535
end; procedure fillstruct(control:PMixerControl;var Cdetails:tMIXERCONTROLDETAILS);
function getpeak(control:PMixerControl;var peak:integer):boolean;
function setvolume(control:Pmixercontrol; volume:Tvolume):boolean;
function getvolume(control:Pmixercontrol; volume:Tvolume):boolean; var
mcontrols:array of array of array of PMixerControl; //mixer的数组,单声卡可以不用
fmixerhandle:HMIXER; //mixer的句柄 implementation procedure fillstruct(control:PMixerControl;var Cdetails:tMIXERCONTROLDETAILS);
begin
Cdetails.cbStruct:=sizeof(cdetails);
cdetails.dwControlID:=Control.dwControlID;
cdetails.cbDetails:=sizeof(integer);
cdetails.hwndOwner:=0;
end; function getpeak(control:PMixerControl;var peak:integer):boolean;
var
details:TMixerControlDetailsSigned;
cdetails:tMIXERCONTROLDETAILS;
begin
Result:=false;
if control.dwControlType<> mixercontrol_controltype_peakmeter then exit;
cdetails.cChannels:=1;
cdetails.paDetails:=@details;
fillstruct(control,cdetails);
result:=mixerGetControlDetails(fmixerhandle,@cdetails,MIXER_GETCONTROLDETAILSF_VALUE)=0;
end; function setvolume(control:Pmixercontrol; volume:Tvolume):boolean;
var
details:array[0..30] of integer;
cdetails:tMIXERCONTROLDETAILS;
begin
fillstruct(control,cdetails);
cdetails.cChannels:=2;
cdetails.paDetails:=@details;
details[0]:=volume.left;
details[1]:=volume.right;
result:=mixerSetControlDetails(fmixerhandle,@cdetails,MIXER_GETCONTROLDETAILSF_VALUE)=0;
volume.left:=details[0];
volume.right:=details[1];
end; function getvolume(control:Pmixercontrol; volume:Tvolume):boolean;
var
details:array[0..30] of integer;
cdetails:tMIXERCONTROLDETAILS;
begin
fillstruct(control,cdetails);
cdetails.cChannels:=2;
cdetails.paDetails:=@details;
result:=mixerGetControlDetails(fmixerhandle,@cdetails,MIXER_GETCONTROLDETAILSF_VALUE)=0;
volume.left:=details[0];
volume.right:=details[1];
end; end. // 调用方法:
procedure TForm1.Button1Click(Sender: TObject);
var s : Tvolume;
kz : Pmixercontrol;
begin
new(kz); //<------------ 此处一定要分配内存
kz.dwControlID := 0;
s.left := 0;
s.right := 0;
try
setvolume(kz,s);
except
end;
freemem(kz);
end;
var Wave:string;
begin
Wave:='$'+inttohex(TrackBar1.Position,4)+inttohex(TrackBar2.Position,4);
waveoutsetvolume(0,strtoint(Wave));
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
var
t,v:Longint;
begin
// if a=0 then Exit;
t:=TrackBar1.Position;
v:=(t shl 8)or(t shl 24);
waveOutSetVolume(0,v);
end; //左声道控制
procedure TForm1.TrackBar2Change(Sender: TObject);
var
t,v:Longint;
begin
t:=TrackBar2.Position;
waveOutGetVolume(0,@v);
v:=v and $ffff0000 or (t shl 8);
waveOutSetVolume(0,v);
end; //右声道控制
procedure TForm1.TrackBar3Change(Sender: TObject);
var
t,v:Longint;
begin
t:=TrackBar3.Position;
waveOutGetVolume(0,@v);
v:=v and $0000ffff or (t shl 24);
waveOutSetVolume(0,v);
end; //获得当前音量值
procedure TForm1.FormCreate(Sender: TObject);
var
v:longint;
begin
waveOutGetVolume(0,@v);
TrackBar2.Position:=hi(v);
TrackBar3.Position:=hi(v shr 16);
if hi(v)>hi(v shr 16) then
TrackBar1.Position:=hi(v)
else
TrackBar1.Position:=hi(v shr 16);
文章介绍,本人介绍一种用Delphi实现控制左右声道音量的妙法,希望能给你的程序添
彩。
一、调节全部音量
1.先在窗体中添加一个trackbar控件,可通过改变它的位置来调节音量,在track
bar1的属性中,我们把Max属性修改成255,改成这个值是为了便于进行二进制的音量调
节操作。
2.为了调用一个Windows函数,在uses子句里加上Mmsystem。
3.为trackbar1的Onchange事件编写如下代码:
procedure Tform1.TrackBar1change(Sender:Tobject);
var t,v:longint;// t的最大值为8位的二进制:11111111;用v来表示音量的大
小,这是个32位的整数,高16位表示右声道的音量,低16位表示左声道的音量
begin
t:=trackbar1.Position;//得到Trackbar的位置,可用这个值来表示音量的大小 v:=(t shl 8) or (t shl 24);//将t左移8位、24位
waveoutsetvolume(0,v);//设置音量
end;
二、分别控制两个声道的方法
1.控制左声道
procedure Tform1.TrackBar1change(Sender:Tobject);
var t,v:longint;
begin
t:=trackbar1.Position;
waveoutgetvolume(0,@v);//@表示指向变量v的指针(32位),调用此函数的用意
就是得到右声道的值,做到在调节左声道的时候,不改变右声道
v:=v and $ffff0000 or (t shl 8);//数字前面加$表示是十六进制数字
waveoutsetvolume(0,v);
end;
2.控制右声道
procedure Tform1.TrackBar2change(Sender:Tobject);
var t,v:longint;//它的原理同上
begin
t:=trackbar2.Position;
waveoutgetvolume(0,@v);
v:=v and $0000ffff or (t shl 24);
waveoutsetvolume(0,v);
end;
三、设置滑块的初始位置
1.程序开始执行时,缺省情况下,Trackbar的位置在0,但我们希望程序开始执行
时,这两个滑块能自动得到当前的音量,而处在相应的位置。
procedure TForm1.FormCreate(Sender: TObject);
var v:longint;
begin
waveoutgetvolume(0,@v);//得到现在音量
trackbar1.Position:=hi(v);//设置左滑块的正确位置
trackbar2.Position:=hi(v shr 16);//设置右声道滑块的正确位置
end;
注:函数hi(v)的作用为:返回一个16位无符号整数的高8位值。如果v为32位,则高
16位自动被忽略了。
2.只使用高8位时,可使调节效果更明显。
3.对波形文件可以用waveoutgetvolume函数,对cd文件可以用auxgetvolume函数。