The IDirectSoundBuffer::SetFormat method sets the format of the primary sound buffer for the application. Whenever this application has the input focus, DirectSound will set the primary buffer to the specified format.
HRESULT SetFormat(
LPCWAVEFORMATEX lpcfxFormat
);
If the method succeeds, the return value is DS_OK.
If the method fails, the return value may be one of the following error values:
| DSERR_BADFORMAT |
| DSERR_INVALIDCALL |
| DSERR_INVALIDPARAM |
| DSERR_OUTOFMEMORY |
| DSERR_PRIOLEVELNEEDED |
| DSERR_UNSUPPORTED |
If this method is called on a primary buffer that is being accessed in write-primary cooperative level, the buffer must be stopped before IDirectSoundBuffer::SetFormat is called. If this method is being called on a primary buffer for a non-write-primary level, DirectSound will implicitly stop the primary buffer, change the format, and restart the primary; the application need not do this explicitly.
This method will succeed even if the hardware does not support the requested format. DirectSound will set the buffer to the closest supported format, then mix the sound in the requested format and convert it before sending it to the primary buffer. To determine whether this is happening, an application can call the IDirectSoundBuffer::GetFormat method for the primary buffer and compare the result with the format that was requested with the SetFormat method.
A call to this method also fails if the calling application has the DSSCL_NORMAL cooperative level.
This method is not valid for secondary sound buffers. If a secondary sound buffer requires a format change, the application should create a new DirectSoundBuffer object using the new format.
DirectSound supports PCM formats; it does not currently support compressed formats.
Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
Header: Declared in dsound.h.
Import Library: Use dsound.lib.