下面是使用低級音頻函數播放 wav 的兩個方法, 對這個感興趣的人恐怕很少, 免注釋了.
使用窗口接受音頻輸出設備的消息:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
protected
procedure WndProc(var Message: TMessage); override;
public
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses MMSystem;
//獲取文件格式和波形數據的函數
function GetWaveFmtData(path: string; var fmt: TWaveFormatEx; var buf: TBytes): Boolean;
var
hFile: HMMIO;
ckiRIFF,ckiFmt,ckiData: TMMCKInfo;
begin
Result := False;
hFile := mmioOpen(PChar(path), nil, MMIO_READ);
if hFile = 0 then Exit;
ZeroMemory(@ckiRIFF, SizeOf(TMMCKInfo));
ZeroMemory(@ckiFmt, SizeOf(TMMCKInfo));
ZeroMemory(@ckiData, SizeOf(TMMCKInfo));
ckiRIFF.fccType := mmiOStringToFOURCC('WAVE', 0);
ckiFmt.ckid := mmiOStringToFOURCC('fmt', 0);
ckiData.ckid := mmiOStringToFOURCC('data', 0);
ZeroMemory(@fmt, SizeOf(TWaveFormatEx));
mmioDescend(hFile, @ckiRIFF, nil, MMIO_FINDRIFF);
if (ckiRIFF.ckid = FOURCC_RIFF) and (ckiRIFF.fccType = mmiOStringToFOURCC('WAVE',0)) and
(mmioDescend(hFile, @ckiFmt, @ckiRIFF, MMIO_FINDCHUNK) = MMSYSERR_NOERROR) and
(mmioRead(hFile, @fmt, ckiFmt.cksize) = ckiFmt.cksize) and
(mmioAscend(hFile, @ckiFmt, 0) = MMSYSERR_NOERROR) and
(mmioDescend(hFile, @ckiData, @ckiRIFF, MMIO_FINDCHUNK) = MMSYSERR_NOERROR) then
begin
SetLength(buf, ckiData.cksize);
Result := (mmioRead(hFile, PAnsiChar(buf), ckiData.cksize) = ckiData.cksize);
end;
mmioClose(hFile, 0);
end;
//------------------------------------------------------------------------------
var
wh: TWaveHdr;
hOut: HWAVEOUT;
fmt: TWaveFormatEx;
buf: TBytes;
procedure TForm1.Button1Click(Sender: TObject);
const
path = 'C:\WINDOWS\Media\Windows XP 啟動.wav';
begin
GetWaveFmtData(path, fmt, buf);
wh.lpData := PAnsiChar(buf);
wh.dwBufferLength := Length(buf);
wh.dwBytesRecorded := 0;
wh.dwUser := 0;
wh.dwFlags := 0;
wh.dwLoops := 2;
wh.lpNext := nil;
wh.reserved := 0;
waveOutOpen(@hOut, WAVE_MAPPER, @fmt, Handle, 0, CALLBACK_WINDOW);
waveOutPrepareHeader(hOut, @wh, SizeOf(TWaveHdr));
waveOutWrite(hOut, @wh, SizeOf(TWaveHdr));
end;
procedure TForm1.WndProc(var Message: TMessage);
begin
inherited;
case Message.Msg of
MM_WOM_OPEN: ;
MM_WOM_CLOSE: ;
MM_WOM_DONE: begin
waveOutUnprepareHeader(hOut, @wh, SizeOf(TWaveHdr));
waveOutClose(hOut);
end;
end;
end;
end.
使用回調函數:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses MMSystem;
function GetWaveFmtData(path: string; var fmt: TWaveFormatEx; var buf: TBytes): Boolean;
var
hFile: HMMIO;
ckiRIFF,ckiFmt,ckiData: TMMCKInfo;
begin
Result := False;
hFile := mmioOpen(PChar(path), nil, MMIO_READ);
if hFile = 0 then Exit;
ZeroMemory(@ckiRIFF, SizeOf(TMMCKInfo));
ZeroMemory(@ckiFmt, SizeOf(TMMCKInfo));
ZeroMemory(@ckiData, SizeOf(TMMCKInfo));
ckiRIFF.fccType := mmiOStringToFOURCC('WAVE', 0);
ckiFmt.ckid := mmiOStringToFOURCC('fmt', 0);
ckiData.ckid := mmiOStringToFOURCC('data', 0);
ZeroMemory(@fmt, SizeOf(TWaveFormatEx));
mmioDescend(hFile, @ckiRIFF, nil, MMIO_FINDRIFF);
if (ckiRIFF.ckid = FOURCC_RIFF) and (ckiRIFF.fccType = mmiOStringToFOURCC('WAVE',0)) and
(mmioDescend(hFile, @ckiFmt, @ckiRIFF, MMIO_FINDCHUNK) = MMSYSERR_NOERROR) and
(mmioRead(hFile, @fmt, ckiFmt.cksize) = ckiFmt.cksize) and
(mmioAscend(hFile, @ckiFmt, 0) = MMSYSERR_NOERROR) and
(mmioDescend(hFile, @ckiData, @ckiRIFF, MMIO_FINDCHUNK) = MMSYSERR_NOERROR) then
begin
SetLength(buf, ckiData.cksize);
Result := (mmioRead(hFile, PAnsiChar(buf), ckiData.cksize) = ckiData.cksize);
end;
mmioClose(hFile, 0);
end;
//------------------------------------------------------------------------------
var
wh: TWaveHdr;
hOut: HWAVEOUT;
fmt: TWaveFormatEx;
buf: TBytes;
procedure WaveProc(hWave: HWAVE; uMsg, dwInstance, dwParam1, dwParam2: DWord); stdcall;
var
r: Integer;
begin
case uMsg of
MM_WOM_OPEN: ;
MM_WOM_CLOSE: ;
MM_WOM_DONE: begin
waveOutUnprepareHeader(hWave, PWaveHdr(dwParam1), SizeOf(TWaveHdr));
waveOutClose(hWave);
end;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
const
path = 'C:\WINDOWS\Media\Windows XP 啟動.wav';
begin
GetWaveFmtData(path, fmt, buf);
wh.lpData := PAnsiChar(buf);
wh.dwBufferLength := Length(buf);
wh.dwBytesRecorded := 0;
wh.dwUser := 0;
wh.dwFlags := 0;
wh.dwLoops := 2;
wh.lpNext := nil;
wh.reserved := 0;
waveOutOpen(@hOut, WAVE_MAPPER, @fmt, DWord(@WaveProc), 0, CALLBACK_FUNCTION);
waveOutPrepareHeader(hOut, @wh, SizeOf(TWaveHdr));
waveOutWrite(hOut, @wh, SizeOf(TWaveHdr));
end;
end.