Советы по Delphi. Версия 1.4.3 от 1.1.2001

Озеров Валентин

PCM.nBlockAlign:=4;

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

PCM.wBitsPerSample:=16;

PCM.cbSize:=0;

dwSize:=SizeOf(DSBUFFERDESC);

dwFlags:=DSBCAPS_PRIMARYBUFFER;

dwBufferBytes:=0;

lpwfxFormat:=nil;

 end;

 if DirectSound.SetCooperativeLevel(Handle, DSSCL_WRITEPRIMARY) <> DS_OK then Raise Exception.Create('Unable to set Cooperative Level');

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

 if DirectSoundBuffer.SetFormat(PCM) <> DS_OK then Raise Exception.Create('Unable to Set Format ');

 if DirectSound.SetCooperativeLevel(Handle, DSSCL_NORMAL) <> DS_OK then Raise Exception.Create('Unable to set Cooperative Level');

end;

procedure TForm1.AppCreateWriteSecondary3DBuffer;

var

 BufferDesc : DSBUFFERDESC;

 Caps : DSBCaps;

 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);