本例效果圖:
代碼文件:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ComCtrls;
type
TForm1 = class(TForm)
OpenDialog1: TOpenDialog;
Button1: TButton;
Button2: TButton;
Button3: TButton;
TrackBar1: TTrackBar;
Label1: TLabel;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure TrackBar1Change(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses Bass;
var
hs: HSTREAM; {流句柄}
reverb: BASS_DX8_REVERB; {混響的參數結構, 不能是局部變量; 本例只測試了結構中的 fReverbTime 參數}
fx: HFX; {DX 的效果句柄}
procedure TForm1.FormCreate(Sender: TObject);
begin
{reverb.fReverbTime: 0.001 - 3000.0; 默認 1000}
TrackBar1.Min := 1;
TrackBar1.Max := 3000;
TrackBar1.Position := 1000;
if HiWord(BASS_GetVersion) <> BASSVERSION then
MessageBox(0, '"Bass.dll" 文件版本不合適! ', nil, MB_ICONERROR);
if not BASS_Init(-1, 44100, 0, 0, nil) then ShowMessage('初始化錯誤');
end;
{打開}
procedure TForm1.Button1Click(Sender: TObject);
var
Mp3Path: AnsiString;
begin
BASS_StreamFree(hs);
OpenDialog1.Filter := 'Mp3 文件(*.mp3)|*.mp3|Wav 文件(*.wav)|*wav';
if OpenDialog1.Execute then
Mp3Path := AnsiString(OpenDialog1.FileName);
{實現混響等效果, 需要指定 BASS_SAMPLE_FX 參數}
hs := BASS_StreamCreateFile(False, PAnsiChar(Mp3Path), 0, 0, BASS_SAMPLE_FX);
if hs < BASS_ERROR_ENDED then
Text := '打開失敗'
else begin
Text := string(Mp3Path);
{設置並返回效果句柄}
fx := BASS_ChannelSetFX(hs, BASS_FX_DX8_REVERB, 0);
end;
end;
{播放}
procedure TForm1.Button2Click(Sender: TObject);
begin
BASS_ChannelPlay(hs, False);
end;
{暫停}
procedure TForm1.Button3Click(Sender: TObject);
begin
BASS_ChannelPause(hs);
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
BASS_Free;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
reverb.fReverbTime := TrackBar1.Position;
BASS_FXSetParameters(fx, @reverb);
Label1.Caption := Format('混響
窗體文件:
object Form1: TForm1
Left = 222
Top = 114
Caption = 'Form1'
ClientHeight = 119
ClientWidth = 299
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
Position = poDesigned
OnCreate = FormCreate
OnDestroy = FormDestroy
PixelsPerInch = 96
TextHeight = 13
object Label1: TLabel
Left = 40
Top = 67
Width = 52
Height = 13
Caption = #28151#21709#26102#38388':'
end
object Button1: TButton
Left = 32
Top = 25
Width = 75
Height = 25
Caption = #25171#24320
TabOrder = 0
OnClick = Button1Click
end
object Button2: TButton
Left = 113
Top = 25
Width = 75
Height = 25
Caption = #25773#25918
TabOrder = 1
OnClick = Button2Click
end
object Button3: TButton
Left = 194
Top = 25
Width = 75
Height = 25
Caption = #26242#20572
TabOrder = 2
OnClick = Button3Click
end
object TrackBar1: TTrackBar
Left = 26
Top = 86
Width = 243
Height = 23
ShowSelRange = False
TabOrder = 3
OnChange = TrackBar1Change
end
object OpenDialog1: TOpenDialog
end
end
