[FFmpeg-devel] [PATCH 0/5][RFC] Speed up AAC decoder

Måns Rullgård mans
Wed Jan 13 15:15:59 CET 2010

Mans Rullgard <mans at mansr.com> writes:

> This patch series speeds up the AAC decoder by 25-50% on Cortex-A8 and
> by 20-30% on Core i7.
> Some of the more obscure parts certainly need a few comments, which I
> will add if there are no objections to this approach.
> Mans Rullgard (5):
>   AAC: use table for cbrtf(n)*n
>   AAC: Compress codebook tables and optimise sign bit handling
>   AAC: simplify some calculations in decode_spectrum_and_dequant()
>   AAC: Unswitch loop over window groups in decode_spectrum_and_dequant()
>   AAC: Reduce depth of vlc_spectral tables to 2

Any further comments on this?

M?ns Rullg?rd
mans at mansr.com

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