DirectSound - allocating buffers

This code creates the DirectSound object and Sets the cooperative level to exclusive.  Then it tries to allocate two buffers - neither of these succeeds and they return with on DS_OUTOFMEMORY error (even when only trying to allocate 1K, 172K or 10M.  Probably just missing something simple.



  // Create DirectSound object
  ErrCo = DirectSoundCreate(NULL, &ProgramData.DS, NULL);
  if (ErrCo != DS_OK) {
    Caption = "Fatal Error DirectSoundCreate: " + IntToStr(ErrCo & 0x2ff);

  // Set Cooperative Level (exclusive)
  ErrCo = ProgramData.DS->SetCooperativeLevel(Handle, DSSCL_EXCLUSIVE);
  if (ErrCo != DS_OK) {
    Caption = "Fatal Error SetCooperativeLevel: " + IntToStr(ErrCo & 0x2ff);

  // Create sound buffers
  WaveFormat.wFormatTag = WAVE_FORMAT_PCM;
  WaveFormat.nChannels = 2;
  WaveFormat.nSamplesPerSec = 44100;
  WaveFormat.wBitsPerSample = 16;
  WaveFormat.nBlockAlign = WaveFormat.nChannels * WaveFormat.wBitsPerSample / 8;
  WaveFormat.nAvgBytesPerSec = WaveFormat.nSamplesPerSec * WaveFormat.nBlockAlign;
  WaveFormat.cbSize = 0;

  BufferDesc.dwSize = sizeof(BufferDesc);
                       | DSBCAPS_CTRLVOLUME
                       | DSBCAPS_GETCURRENTPOSITION2
                       | DSBCAPS_LOCSOFTWARE;
  BufferDesc.dwBufferBytes = 8*1024; //1*WaveFormat.nAvgBytesPerSec;
  BufferDesc.lpwfxFormat = &WaveFormat;

  ErrCo // First
   = ProgramData.DS->CreateSoundBuffer(&BufferDesc, &ProgramData.SoundBuffChannel1, NULL);
  if (ErrCo != DS_OK) {
    Caption = "Fatal Error CreateSoundBuffer (1): " + IntToStr(ErrCo & 0x2ff);

  ErrCo // Second
   = ProgramData.DS->CreateSoundBuffer(&BufferDesc, &ProgramData.SoundBuffChannel2, NULL);
  if (ErrCo != DS_OK) {
    Caption = "Fatal Error CreateSoundBuffer (2): " + IntToStr(ErrCo & 0x2ff);
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

1 - Are you sure DirectSound is working fine in your computer ?. Try runnig DS examples and check the values of BufferDesc
before calling CreateSoundBuffer.

2 - Try this before the call :

  memset(&DSBufferDesc, 0, sizeof(DSBUFFERDESC)); // Zero it out.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
OdieAuthor Commented:
Zeroing it out did the trick.
Yes you forgot to set DSBufferDesc.dwReserved = 0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.