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DirectSound buffer-play(...) returns DSERR_PRIOLEVELNEEDED error

Started by cmptrgy412 Jan 28, 2006 at 7:54 PM 7 replies 9.3k views

Original Post

Jan 28, 2006 at 7:54 PM

Hi i have a direct sound program in which I have a capture buffer created, then a sound buffer. The capture buffer will write to the sound buffer. Both are created successfully, or no errors are thrown, but when I use the play function: if( FAILED( hr = pBuffer->Play( 0, 0, DSBPLAY_LOOPING ) ) ) it returns 0x88780046 and through the error look up tool that's

Quote:
Name: DSERR_PRIOLEVELNEEDED Description: The caller does not have the priority level required for the function to succeed

I have tried to do many things, but no use. It's just an ordinary secondary sound buffer. I can't figure this out. Thanks in advance

jflanglois

Jan 28, 2006 at 8:13 PM

Well, the DirectSound documentation says:

Quote:
DirectSound Return Values by Name
DSERR_PRIOLEVELNEEDED

A cooperative level of DSSCL_PRIORITY or higher is required.

So, have you set the priority level to DSSCL_PRIORITY or above (IDirectSound8::SetCooperativeLevel( hwnd, DSSCL_PRIORITY );)?

jfl.

cmptrgy412

Jan 28, 2006 at 8:19 PM

Yes, but still get that error

jflanglois

Jan 28, 2006 at 8:25 PM

Would it be possible to see some of your code?

cmptrgy412

Jan 28, 2006 at 8:59 PM

Here is all the relevant directsound code. Somewhat compacted of course, and clean up code removed:

	CoInitialize( NULL );	g_hNotify = CreateEvent( NULL, FALSE, FALSE, NULL );		deviceNum = 0;	if( FAILED( hr = CoCreateInstance( (const IID &)CLSID_DirectSound8, NULL, CLSCTX_INPROC_SERVER, IID_IDirectSound8, (LPVOID *)&pSound ) ) )	{		Error( "Could Not Create DirectSound 8", hr );		exit(0);	}	pSound->Initialize( NULL );	pSound->SetCooperativeLevel( 0, DSSCL_PRIORITY );	if( FAILED( DirectSoundCaptureEnumerate( EnumerateDevices, 0 ) ) )	{		MessageBox( 0, "Failure to Enumerate Capture Devices.\nDo you have a sound card correctly installed?", 0, 0 );		exit(0);	}	cout << "0) Primary Sound Capture Device" << endl;	for( int i = 1; i < deviceNum; i++ )	{		cout << i << ") " << g_cDeviceList.lpcstrDescription << endl;	}	cout << endl << "Enter selection: ";	int selection = 0;	cin >> selection;	WAVEFORMATEX wfx;	DSBUFFERDESC dbsd;	DSCBUFFERDESC dcbsd;	LPDIRECTSOUNDBUFFER pDsb = NULL;	HRESULT hr;	memset( &wfx, 0, sizeof(WAVEFORMATEX) );	wfx.wFormatTag = WAVE_FORMAT_PCM;	wfx.nChannels = 2;	wfx.nSamplesPerSec = 44100;	wfx.wBitsPerSample = 16;	wfx.nBlockAlign = wfx.nChannels*(wfx.wBitsPerSample/8);	wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign;	memset( &dbsd, 0, sizeof( DSBUFFERDESC ) );	memset( &dcbsd, 0, sizeof( DSCBUFFERDESC ) );	dcbsd.dwSize = sizeof( DSCBUFFERDESC );	dbsd.dwSize = sizeof( DSBUFFERDESC );	dcbsd.dwFlags = 0;	dbsd.dwFlags = DSBCAPS_GLOBALFOCUS;  	dcbsd.dwBufferBytes = dbsd.dwBufferBytes = 1 * wfx.nAvgBytesPerSec;	dcbsd.lpwfxFormat = dbsd.lpwfxFormat = &wfx	dbsd.guid3DAlgorithm = DS3DALG_DEFAULT;	dcbsd.dwFXCount = 0;	dcbsd.lpDSCFXDesc = NULL;	dBufSize = dcbsd.dwBufferBytes;		if( FAILED( hr = DirectSoundCaptureCreate8( g_cDeviceList[selection].lpGuid, &pCapture, NULL ) ) )	{		Error( "Failed To Create DirectSound Capture Device", hr );		exit(0);	}	LPDIRECTSOUNDCAPTUREBUFFER cbuf;	if( FAILED( hr = pCapture->CreateCaptureBuffer( &dcbsd, &cbuf, NULL ) ) )	{		Error( "Failed To Create DirectSound Capture Buffer", hr );		exit(0);	}	if( FAILED( hr = cbuf->QueryInterface( IID_IDirectSoundCaptureBuffer8, (VOID **)&pCaptureBuffer ) ) )	{		Error( "Failed to obtain DirectSoundCaptureBuffer8 object from \"cbuf\"", hr );		exit(0);	}	cbuf->Release();	LPDIRECTSOUNDBUFFER buf;	if( FAILED( hr = pSound->CreateSoundBuffer( &dbsd, &buf, NULL ) ) )	{		Error( "Failed To Create Main DirectSound Output Buffer", hr );		exit(0);	}	if( FAILED( hr = buf->QueryInterface( IID_IDirectSoundBuffer8, (VOID **)&pBuffer ) ) )	{		Error( "Failed to obtain DirectSoundBuffer8 object from \"buf\"", hr );		exit(0);	}	buf->Release();	if( FAILED( hr = pCaptureBuffer->QueryInterface( IID_IDirectSoundNotify8, (VOID **)&pNotify ) ) )	{		Error( "Unable To Create IDirectSoundNotify8 interface.", hr );		exit(0);	}	DSBPOSITIONNOTIFY notifies[3];	notifies[0].dwOffset = 0;	notifies[1].dwOffset = (dbsd.dwBufferBytes/3);	notifies[2].dwOffset = 2*(dbsd.dwBufferBytes/3);	notifies[0].hEventNotify = notifies[1].hEventNotify = notifies[2].hEventNotify = g_hNotify;	if( FAILED( hr = pNotify->SetNotificationPositions( 3, notifies ) ) )	{		Error( "Unable to set notification Positions", hr );		exit(0);	}        if( FAILED( hr = pBuffer->Play( 0, 0, DSBPLAY_LOOPING ) ) )                Error( "Failure to play buffer", hr );

EDIT: Please use 'source' tags for longer/wider fragments of code. Thanks!

[Edited by - jollyjeffers on January 29, 2006 8:59:40 AM]

jflanglois

Jan 28, 2006 at 9:25 PM

I'm pretty certain that you cannot pass in a null HWND to IDirectSound8::SetCooperativeLevel(). Try testing SetCooperativeLevel() for failure (it will probably be E_INVALIDARG or DSERR_INVALIDPARAM, depending on which documentation you check).

[edit] Also, for large blocks of code like the above, use source tags instead of code tags.

jfl.

cmptrgy412

Jan 28, 2006 at 9:28 PM

Yes, that was the problem, fixing it now

cmptrgy412

Jan 28, 2006 at 9:34 PM

Yes, now working, thankyou very much

jflanglois

Jan 28, 2006 at 9:39 PM

You're welcome.

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