{相關結構:}
TDSFXEcho = packed record
fWetDryMix: Single; //0 .. 100 : 50 (%)
fFeedback: Single; //0 .. 100 : 50 (%)
fLeftDelay: Single; //1 .. 2000 : 500(ms)
fRightDelay: Single; //1 .. 2000 : 500(ms)
lPanDelay: Longint; //0 .. 1 : 0 (False)
end;
//該結構相關常量:
DSFXECHO_WETDRYMIX_MIN = 0.0;
DSFXECHO_WETDRYMIX_MAX = 100.0;
DSFXECHO_FEEDBACK_MIN = 0.0;
DSFXECHO_FEEDBACK_MAX = 100.0;
DSFXECHO_LEFTDELAY_MIN = 1.0;
DSFXECHO_LEFTDELAY_MAX = 2000.0;
DSFXECHO_RIGHTDELAY_MIN = 1.0;
DSFXECHO_RIGHTDELAY_MAX = 2000.0;
DSFXECHO_PANDELAY_MIN = 0; //False
DSFXECHO_PANDELAY_MAX = 1; //True
測試代碼:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
LabeledEdit1: TLabeledEdit;
LabeledEdit2: TLabeledEdit;
LabeledEdit3: TLabeledEdit;
LabeledEdit4: TLabeledEdit;
RadioGroup1: TRadioGroup;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure RadioGroup1Click(Sender: TObject);
procedure LabeledEdit1Change(Sender: TObject);
procedure FormDestroy(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses DirectSound, ReadWave2;
var
myDSound: IDirectSound8;
buf8: IDirectSoundBuffer8;
fxEcho: IDirectSoundFXEcho8; //IDirectSoundFXEcho8 效果器
procedure TForm1.FormCreate(Sender: TObject);
begin
System.ReportMemoryLeaksOnShutdown := True;
DirectSoundCreate8(nil, myDSound, nil);
myDSound.SetCoOperativeLevel(Handle, DSSCL_NORMAL);
Button1.Caption := '打開並播放';
Button2.Caption := '停止播放';
LabeledEdit1.EditLabel.Caption := 'fWetDryMix: 0.0 - 100.';
LabeledEdit1.Text := '50.0';
LabeledEdit1.Tag := 1;
LabeledEdit2.EditLabel.Caption := 'fFeedback: 0.0 - 100.0';
LabeledEdit2.Text := '50.0';
LabeledEdit2.Tag := 2;
LabeledEdit3.EditLabel.Caption := 'fLeftDelay: 1.0 - 2000.0';
LabeledEdit3.Text := '500.0';
LabeledEdit3.Tag := 3;
LabeledEdit4.EditLabel.Caption := 'fRightDelay: 1.0 - 2000.0';
LabeledEdit4.Text := '500.0';
LabeledEdit4.Tag := 4;
RadioGroup1.Caption := 'lPanDelay:';
RadioGroup1.Items.CommaText := 'False, True';
RadioGroup1.ItemIndex := 0;
LabeledEdit2.OnChange := LabeledEdit1.OnChange;
LabeledEdit3.OnChange := LabeledEdit1.OnChange;
LabeledEdit4.OnChange := LabeledEdit1.OnChange;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
buf: IDirectSoundBuffer;
bufDesc: TDSBufferDesc;
rEffect: TDSEffectDesc;
wav: TReadWave;
p1: Pointer;
n1: DWord;
begin
wav := TReadWave.Create;
if not wav.OpenDialog then begin wav.Free; Exit; end;
ZeroMemory(@bufDesc, SizeOf(TDSBufferDesc));
bufDesc.dwSize := SizeOf(TDSBufferDesc);
bufDesc.dwFlags := DSBCAPS_CTRLFX;
bufDesc.dwBufferBytes := wav.Size;
bufDesc.lpwfxFormat := @wav.Format;
myDSound.CreateSoundBuffer(bufDesc, buf, nil);
buf.QueryInterface(IID_IDirectSoundBuffer8, buf8);
buf8.Lock(0, 0, @p1, @n1, nil, nil, DSBLOCK_ENTIREBUFFER);
wav.Read(p1, n1);
wav.Free;
buf8.Unlock(p1, n1, nil, 0);
ZeroMemory(@rEffect, SizeOf(TDSEffectDesc));
rEffect.dwSize := SizeOf(TDSEffectDesc);
rEffect.dwFlags := 0;
rEffect.guidDSFXClass := GUID_DSFX_STANDARD_ECHO;
buf8.SetFX(1, @rEffect, nil);
buf8.GetObjectInPath(GUID_DSFX_STANDARD_ECHO, 0, IID_IDirectSoundFXEcho8, fxEcho);
buf8.Play(0, 0, DSBPLAY_LOOPING);
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
if Assigned(buf8) then buf8.Stop;
end;
procedure TForm1.RadioGroup1Click(Sender: TObject);
var
rEcho: TDSFXEcho;
begin
if buf8 = nil then Exit;
rEcho.fWetDryMix := StrToFloat(LabeledEdit1.Text);
rEcho.fFeedback := StrToFloat(LabeledEdit2.Text);
rEcho.fLeftDelay := StrToFloat(LabeledEdit3.Text);
rEcho.fRightDelay := StrToFloat(LabeledEdit4.Text);
rEcho.lPanDelay := RadioGroup1.ItemIndex;
fxEcho.SetAllParameters(rEcho);
end;
procedure TForm1.LabeledEdit1Change(Sender: TObject);
var
f: Single;
obj: TLabeledEdit;
begin
obj := Sender as TLabeledEdit;
//if obj.Text = '-' then Exit;
f := StrToFloatDef(obj.Text, MaxInt);
case obj.Tag of
1: if (f < 0) or (f > 100) then obj.Text := '50.0';
2: if (f < 0) or (f > 100) then obj.Text := '50.0';
3,4: if (f < 1) or (f > 2000) then obj.Text := '500.0';
end;
RadioGroup1.OnClick(nil);
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
buf8 := nil;
myDSound := nil;
end;
end.
窗體設計:
object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClIEntHeight = 194
ClIEntWidth = 326
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
OnCreate = FormCreate
OnDestroy = FormDestroy
PixelsPerInch = 96
TextHeight = 13
object Button1: TButton
Left = 32
Top = 22
Width = 75
Height = 25
Caption = 'Button1'
TabOrder = 0
OnClick = Button1Click
end
object Button2: TButton
Left = 32
Top = 53
Width = 75
Height = 25
Caption = 'Button2'
TabOrder = 1
OnClick = Button2Click
end
object LabeledEdit1: TLabeledEdit
Left = 168
Top = 24
Width = 138
Height = 21
EditLabel.Width = 61
EditLabel.Height = 13
EditLabel.Caption = 'LabeledEdit1'
TabOrder = 2
OnChange = LabeledEdit1Change
end
object LabeledEdit2: TLabeledEdit
Left = 168
Top = 67
Width = 138
Height = 21
EditLabel.Width = 61
EditLabel.Height = 13
EditLabel.Caption = 'LabeledEdit2'
TabOrder = 3
end
object LabeledEdit3: TLabeledEdit
Left = 168
Top = 112
Width = 138
Height = 21
EditLabel.Width = 61
EditLabel.Height = 13
EditLabel.Caption = 'LabeledEdit3'
TabOrder = 4
end
object LabeledEdit4: TLabeledEdit
Left = 168
Top = 160
Width = 138
Height = 21
EditLabel.Width = 61
EditLabel.Height = 13
EditLabel.Caption = 'LabeledEdit4'
TabOrder = 5
end
object RadioGroup1: TRadioGroup
Left = 16
Top = 104
Width = 129
Height = 77
Caption = 'RadioGroup1'
TabOrder = 6
OnClick = RadioGroup1Click
end
end
運行效果圖:
