Delphi中用多媒体库Bass.dll播放mp3 [8]

本例效果图:

代码文件:

unit Unit1;
interface
uses
　 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
　 Dialogs, StdCtrls, ExtCtrls, ComCtrls;
type
　 TForm1 = class(TForm)
　　 OpenDialog1: TOpenDialog;
　　 Timer1: TTimer;
　　 Button1: TButton;
　　 Button2: TButton;
　　 Button3: TButton;
　　 ProgressBar1: TProgressBar;
　　 ProgressBar2: TProgressBar;
　　 procedure FormCreate(Sender: TObject);
　　 procedure Button1Click(Sender: TObject);
　　 procedure Button2Click(Sender: TObject);
　　 procedure Button3Click(Sender: TObject);
　　 procedure FormDestroy(Sender: TObject);
　　 procedure Timer1Timer(Sender: TObject);
　 end;
var
　 Form1: TForm1;
implementation
{$R *.dfm}
uses Bass;
var
　 hs: HSTREAM;　{流句柄}
procedure TForm1.FormCreate(Sender: TObject);
begin
　 Timer1.Interval := 100;
　 Timer1.Enabled := False;
　 ProgressBar1.Align := alLeft;
　 ProgressBar2.Align := alRight;
　 ProgressBar1.Orientation := pbVertical;
　 ProgressBar2.Orientation := pbVertical;
　 ProgressBar1.Width := 20;
　 ProgressBar2.Width := 20;
　 ProgressBar1.Max := MAXWORD div 2;
　 ProgressBar2.Max := MAXWORD div 2;
　 if HiWord(BASS_GetVersion) <> BASSVERSION then
　　 MessageBox(0, '"Bass.dll" 文件版本不合适! ', nil, MB_ICONERROR);
　 if not BASS_Init(-1, 44100, 0, 0, nil) then ShowMessage('初始化错误');
end;
{打开}
procedure TForm1.Button1Click(Sender: TObject);
var
　 Mp3Path: AnsiString;
begin
　 BASS_StreamFree(hs);
　 Timer1.Enabled := False;
　 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 := '打开失败'
　 else
　　 Text := Mp3Path;
end;
{播放}
procedure TForm1.Button2Click(Sender: TObject);
begin
　 BASS_ChannelPlay(hs, False);
　 Timer1.Enabled := True;
end;
{暂停}
procedure TForm1.Button3Click(Sender: TObject);
begin
　 BASS_ChannelPause(hs);
　 Timer1.Enabled := False;
end;
{显示左右声道的峰值}
procedure TForm1.Timer1Timer(Sender: TObject);
var
　 Level: Cardinal;
begin
　 Level := BASS_ChannelGetLevel(hs); {其低16位为左声道峰值; 高16位为右声道峰值 }
　 ProgressBar1.Position := LoWord(Level);
　 ProgressBar2.Position := HiWord(Level);
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
　 BASS_Free;
end;
end.