本例效果圖:
代碼文件:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls, ComCtrls;
type
TForm1 = class(TForm)
OpenDialog1: TOpenDialog;
Button1: TButton;
Button2: TButton;
Button3: TButton;
TrackBar1: TTrackBar;
TrackBar2: TTrackBar;
Label1: TLabel;
Label2: TLabel;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure TrackBar1Change(Sender: TObject);
procedure TrackBar2Change(Sender: TObject);
procedure FormDestroy(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses Bass;
var
hs: HSTREAM; {流句柄}
procedure TForm1.FormCreate(Sender: TObject);
begin
TrackBar1.ShowSelRange := False;
TrackBar1.Min := 0;
TrackBar1.Max := 40;
TrackBar1.Position := TrackBar1.Max;
TrackBar2.ShowSelRange := False;
TrackBar2.Min := -20;
TrackBar2.Max := 20;
TrackBar2.Position := 0;
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);
hs := BASS_StreamCreateFile(False, PAnsiChar(Mp3Path), 0, 0, 0);
if hs < BASS_ERROR_ENDED then
Text := '打開失敗'
else begin
TrackBar1Change(nil);
TrackBar2Change(nil);
Text := string(Mp3Path);
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;
{設置和獲取音量}
procedure TForm1.TrackBar1Change(Sender: TObject);
var
vol: Single;
begin
BASS_ChannelSetAttribute(hs, BASS_ATTRIB_VOL, TrackBar1.Position / TrackBar1.Max);
BASS_ChannelGetAttribute(hs, BASS_ATTRIB_VOL, vol);
Label1.Caption := Format('當前音量值: %f', [vol]);
end;
{設置和獲取相位}
procedure TForm1.TrackBar2Change(Sender: TObject);
var
pan: Single;
begin
BASS_ChannelSetAttribute(hs, BASS_ATTRIB_PAN, TrackBar2.Position / TrackBar2.Max);
BASS_ChannelGetAttribute(hs, BASS_ATTRIB_PAN, pan);
Label2.Caption := Format('當前相位值: %f', [pan]);
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
BASS_Free;
end;
end.
窗體文件:
object Form1: TForm1
Left = 205
Top = 107
Caption = 'Form1'
ClientHeight = 157
ClientWidth = 286
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 = 32
Top = 59
Width = 31
Height = 13
Caption = 'Label1'
end
object Label2: TLabel
Left = 32
Top = 109
Width = 31
Height = 13
Caption = 'Label2'
end
object Button1: TButton
Left = 24
Top = 17
Width = 75
Height = 25
Caption = #25171#24320
TabOrder = 0
OnClick = Button1Click
end
object Button2: TButton
Left = 105
Top = 17
Width = 75
Height = 25
Caption = #25773#25918
TabOrder = 1
OnClick = Button2Click
end
object Button3: TButton
Left = 186
Top = 17
Width = 75
Height = 25
Caption = #26242#20572
TabOrder = 2
OnClick = Button3Click
end
object TrackBar1: TTrackBar
Left = 24
Top = 74
Width = 237
Height = 32
TabOrder = 3
OnChange = TrackBar1Change
end
object TrackBar2: TTrackBar
Left = 24
Top = 123
Width = 237
Height = 28
TabOrder = 4
OnChange = TrackBar2Change
end
object OpenDialog1: TOpenDialog
Left = 248
Top = 32
end
