[SDL] signal processing and SDL

Michel Bardiaux mbardiaux at mediaxim.be
Thu Sep 1 02:43:17 PDT 2005


Matt Flax wrote:
> Hello all,
> 
> I would like to use the SDL library for audio signal processing ... more 
> specificly I would like to incorperate WSOLA 
> and SDL to make an audio 
> speed change library.

The current speed change code in SDL is no good at all, it would be nice 
if you actually *replaced* it with something that worked for any ratio.

> 
> OK ... so I am wondering whether anyone knows of any examples which have 
> the following properties :
> a] an init function
> b] a play CALLBACK function which :
> 	loads data from an audio file
> 	signal processes the data
> 	writes the new processed data to the sound device.
> 
> It is important that the play function gets called from an SDL operated 
> thread when need be to read a certain ammount of data for the sound 
> device to play ...
> 
> thanks
> Matt
> 


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Michel Bardiaux
R&D Director
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