[Openal] Crackles when changing gain

Daniel PEACOCK dpeacock at creativelabs.com
Mon Mar 31 16:00:33 PDT 2008





Hi Anders,

The "Generic Software" device does not currently do parameter value ramping
within a processing block - so this could be why you are hearing artifacts.
Are you doing any ramping at all?

Dan
Creative Labs, Inc.

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             Anders Stenberg                                               
             <anders.stenberg@                                             
             powerchallenge.co                                          To 
             m>                        openal at opensource.creative.com      
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             openal-bounces at op                                             
             ensource.creative                                     Subject 
             .com                      [Openal] Crackles when changing     
                                       gain                                
                                                                           
             03/31/2008 02:13                                              
             AM                                                            
                                                                           
                                                                           
                                                                           




Hi

I have a situation where I change the gain of multiple sound sources quite
a lot (fade between them), and while doing this I experience crackles in
the sound. The manual says (in section 4.1) that "The implementation is in
charge of ensuring artifact-free (click-free) changes of gain values and is
free to defer actual modification of the sound samples, within the limits
of acceptable latencies.", but it really seems it's not doing that. I'm
currently running the "Generic Software" route.

Anyone had the same problems, or got any ideas?
--
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
 Anders Stenberg | PowerChallenge AB                                        
                                                                            
 Senior Developer                                                           
                                                                            
                                                                            
                                                                            
 anders.stenberg at powerchallenge.com                                         
                                                                            
                                                                            
 corporate.powerchallenge.com | powerchallenge.com | managerzone.com        
                                                                            

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