Советы по Delphi. Версия 1.4.3 от 1.1.2001

 PCM         : TWaveFormatEx;

begin

 FillChar(BufferDesc, SizeOf(DSBUFFERDESC), 0);

 FillChar(PCM, SizeOf(TWaveFormatEx), 0);

 with BufferDesc do begin

  PCM.wFormatTag:=WAVE_FORMAT_PCM;

  if isStereo then PCM.nChannels:=2

  else PCM.nChannels:=1;

  PCM.nSamplesPerSec:=SamplesPerSec;

  PCM.nBlockAlign:=(Bits div 8)*PCM.nChannels;

  PCM.nAvgBytesPerSec:=PCM.nSamplesPerSec * PCM.nBlockAlign;

  PCM.wBitsPerSample:=Bits;

  PCM.cbSize:=0;

  dwSize:=SizeOf(DSBUFFERDESC);

  dwFlags:=DSBCAPS_STATIC or DSBCAPS_CTRL3D;

  dwBufferBytes:=Time*PCM.nAvgBytesPerSec;

  lpwfxFormat:=@PCM;

 end;

 if DirectSound.CreateSoundBuffer(BufferDesc, Buffer, nil) <> DS_OK then Raise Exception.Create('Create Sound Buffer failed');

end;

procedure TForm1.AppWriteDataToBuffer;

var

 AudioPtr1, AudioPtr2: Pointer;

 AudioBytes1, AudioBytes2: DWord;

 h: HResult;

 Temp: Pointer;

begin

 H:=Buffer.Lock(OffSet, SoundBytes, AudioPtr1, AudioBytes1, AudioPtr2, AudioBytes2, 0);

 if H = DSERR_BUFFERLOST  then begin

  Buffer.Restore;

  if Buffer.Lock(OffSet, SoundBytes, AudioPtr1, AudioBytes1, AudioPtr2, AudioBytes2, 0) <> DS_OK then Raise Exception.Create('Unable to Lock Sound Buffer');

 end

 else if H <> DS_OK then Raise Exception.Create('Unable to Lock Sound Buffer');

 Temp:=@SoundData;

 Move(Temp^, AudioPtr1^, AudioBytes1);

 if AudioPtr2 <> nil then begin

  Temp:=@SoundData;

  Inc(Integer(Temp), AudioBytes1);

  Move(Temp^, AudioPtr2^, AudioBytes2);

 end;

 if Buffer.UnLock(AudioPtr1, AudioBytes1, AudioPtr2, AudioBytes2) <> DS_OK then Raise Exception.Create('Unable to UnLock Sound Buffer');

end;

procedure TForm1.CopyWAVToBuffer;

var

 Data     : PChar;

 FName    : TFileStream;

 DataSize : DWord;

 Chunk    : String[4];

 Pos      : Integer;

begin

 FName:=TFileStream.Create(Name,fmOpenRead);

 Pos:=24;

 SetLength(Chunk,4);

 repeat

  FName.Seek(Pos, soFromBeginning);

  FName.Read(Chunk[1], 4);

  Inc(Pos);

 until Chunk = 'data';

 FName.Seek(Pos+3, soFromBeginning);

 FName.Read(DataSize, SizeOf(DWord));

 GetMem(Data, DataSize);

 FName.Read(Data^, DataSize);

 FName.Free;

 AppWriteDataToBuffer(Buffer, 0, Data^, DataSize);

 FreeMem(Data, DataSize);

end;

var Pos : Single = -25;

procedure TForm1.AppSetSecondary3DBuffer;

begin

 if Buffer.QueryInterface(IID_IDirectSound3DBuffer, _3DBuffer) <> DS_OK then Raise Exception.Create('Failed to create IDirectSound3D object');

 if _3DBuffer.SetPosition(Pos, 1, 1, 0) <> DS_OK then Raise Exception.Create('Failed to set IDirectSound3D Position');

end;

procedure TForm1.Button1Click(Sender: TObject);

begin

 CopyWAVToBuffer('xhe4.wav',SecondarySoundBuffer);

 if SecondarySoundBuffer.Play(0, 0, DSBPLAY_LOOPING) <> DS_OK then ShowMessage('Can''t play the Sound');