Direct Sound: Primary Buffer !?!!!
February 15, 2000 07:01 PM
I know that when you create a direct sound interface the primary buffer defaults to 8-bit 22Khz... I want to know how you can change that to, say, 16-bit 22Khz...
Thanks,
Jerec
JerecCM Software"Oro?"
122
February 16, 2000 03:53 AM
I belive it should be something like this:
DirectSoundCreate( NULL, &m_lpDS ,NULL);
ZeroMemory(&dsbdesc, sizeof( DSBUFFERDESC ) );
m_lpDSB = NULL;
m_lpDS->SetCooperativeLevel(m_hWnd,DSSCL_PRIORITY);
//Set up DSBUFFERDESC structure.
memset( &dsbdesc, 0, sizeof( DSBUFFERDESC ) );
dsbdesc.dwSize = sizeof( DSBUFFERDESC );
dsbdesc.dwFlags = DSBCAPS_PRIMARYBUFFER;
dsbdesc.dwBufferBytes = 0; //Must be 0 for primary buffer.
dsbdesc.lpwfxFormat = NULL; //Must be NULL for primary buffer.
memset( &wfm, 0, sizeof(WAVEFORMATEX));
wfm.wFormatTag = WAVE_FORMAT_PCM;
wfm.nChannels = 1; //mono
wfm.wBitsPerSample = 16; //16-bit sound wfm.nSamplesPerSec = 22050; //22kHz
wfm.nBlockAlign = wfm.wBitsPerSample / 8 * wfm.nChannels;
wfm.nAvgBytesPerSec = wfm.nSamplesPerSec * wfm.nBlockAlign;
Actually I have no idea but this works for me.
m_grínder
DirectSoundCreate( NULL, &m_lpDS ,NULL);
ZeroMemory(&dsbdesc, sizeof( DSBUFFERDESC ) );
m_lpDSB = NULL;
m_lpDS->SetCooperativeLevel(m_hWnd,DSSCL_PRIORITY);
//Set up DSBUFFERDESC structure.
memset( &dsbdesc, 0, sizeof( DSBUFFERDESC ) );
dsbdesc.dwSize = sizeof( DSBUFFERDESC );
dsbdesc.dwFlags = DSBCAPS_PRIMARYBUFFER;
dsbdesc.dwBufferBytes = 0; //Must be 0 for primary buffer.
dsbdesc.lpwfxFormat = NULL; //Must be NULL for primary buffer.
memset( &wfm, 0, sizeof(WAVEFORMATEX));
wfm.wFormatTag = WAVE_FORMAT_PCM;
wfm.nChannels = 1; //mono
wfm.wBitsPerSample = 16; //16-bit sound wfm.nSamplesPerSec = 22050; //22kHz
wfm.nBlockAlign = wfm.wBitsPerSample / 8 * wfm.nChannels;
wfm.nAvgBytesPerSec = wfm.nSamplesPerSec * wfm.nBlockAlign;
Actually I have no idea but this works for me.
m_grínder
February 16, 2000 06:26 AM
Its all to do with the co-operative level. If you set it to DDSCL_NORMAL you can''t change the PCM format from 8bit at 22 samples per second - if you need to change it to a different format, make sure you set the co-op level to DDSCL_PRIORITY.
February 16, 2000 10:33 AM
Not sure what happened there... ha ha...
JerecCM Software"Oro?"
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