Delphi中用多媒体库Bass.dll播放mp3 [3]

//播放前先要用 BASS_Init 函数进行播放设备初始化
function BASS_Init(
  device: Integer; {指定输出设备, 第一个是 1、第二个是 2; -1 表示使用当前设 备}
  freq: DWORD;   {采样率, 一般是 44100}
  flags: DWORD;  {是 BASS_DEVICE_MONO 等常量的组合值, 是效果参数; 0 是默认值 }
  win: HWND;    {指定窗口句柄; 0 表示当前窗口}
  clsid: PGUID   {指定一个 GUID, 用以初始化 DirectSound; nil 表示使用默认}
): BOOL; stdcall; external bassdll;
//当然需要从文件或内存加载文件流以后才能播放
function BASS_StreamCreateFile(
  mem: BOOL;   {从文件载入这里是 False; 从内存载入这里是 True}
  f: Pointer;  {文件名或内存流的指针}
  offset: QWORD; {播放起始点, 单位是 1/10 毫米; 只在参数 1: mem = False 时有效 ; 默认是 0}
  length: QWORD; {播放终止点, 单位是 1/10 毫米; 只在参数 1: mem = False 时有效 ; 默认是 0}
  flags: DWORD  {BASS_SAMPLE_3D 等参数的组合; 控制播放效果、反复和解码等等}
): HSTREAM; stdcall; external bassdll;
{另外: 在调入内存流时, 参数 length 要指定为流的大小}

窗体设计图:

代码文件:

unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
type
  TForm1 = class(TForm)
   OpenDialog1: TOpenDialog;
   Button1: TButton;
   Button2: TButton;
   Button3: TButton;
   Button4: TButton;
   procedure FormCreate(Sender: TObject);
   procedure Button1Click(Sender: TObject);
   procedure Button2Click(Sender: TObject);
   procedure Button3Click(Sender: TObject);
   procedure Button4Click(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
  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 mp3 文件, 并建立播放流}
procedure TForm1.Button1Click(Sender: TObject);
var
  Mp3Path: AnsiString;
begin
  {打开文件}
  OpenDialog1.Filter := 'Mp3 文件(*.mp3)|*.mp3|Wav 文件(*.wav)|*wav';
  if OpenDialog1.Execute then
   Mp3Path := AnsiString(OpenDialog1.FileName);
  {如果已有文件打开, 先要释放它}
  BASS_StreamFree(hs);
  {建立播放流}
  hs := BASS_StreamCreateFile(False, PAnsiChar(Mp3Path), 0, 0, 0);
  {是否打开成功, 显示一下}
  if hs < BASS_ERROR_ENDED then
   Text := '打开失败' else Text := string(Mp3Path);
end;
{播放}
procedure TForm1.Button2Click(Sender: TObject);
begin
  BASS_ChannelPlay(hs, False); {参数 1 是流句柄; 参数 2 若是 True 每次都会从头 播放}
end;
{暂停}
procedure TForm1.Button3Click(Sender: TObject);
begin
  BASS_ChannelPause(hs);
end;
{停止}
procedure TForm1.Button4Click(Sender: TObject);
begin
  BASS_ChannelStop(hs);
end;
{释放}
procedure TForm1.FormDestroy(Sender: TObject);
begin
  BASS_Free;
end;
end.

时间: 2024-12-23 21:55:32

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