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Subject: RE: Opus codec developmentsRE: Opus codec developments
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From: Mike Giacomelli <giac2000_at_hotmail.com>
Date: Thu, 16 Aug 2012 08:35:40 -0700
>Is the existing codeclib mdct being used now (which is already heavily optimised)? Or is optimisation lower down the priority list and/or mdct not the bottleneck?
We can't use the codeclib MDCT as Opus does not use power of 2 transforms. It uses its own FFT based on KISSFFT. Algorithmically its probably not too bad, but without ASM I imagine gcc makes a mess of it.
Received on 2012-08-16
Date: Thu, 16 Aug 2012 08:35:40 -0700
>Is the existing codeclib mdct being used now (which is already heavily optimised)? Or is optimisation lower down the priority list and/or mdct not the bottleneck?
We can't use the codeclib MDCT as Opus does not use power of 2 transforms. It uses its own FFT based on KISSFFT. Algorithmically its probably not too bad, but without ASM I imagine gcc makes a mess of it.
Received on 2012-08-16
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