[FFmpeg-devel] [PATCH] optimize init_vlc

[Loren Merritt]

On Sun, 28 Mar 2010, M?ns Rullg?rd wrote:

> Loren Merritt <lorenm at u.washington.edu> writes:
>
>> optimize init_vlc().
>
> Is the speed of init_vlc() ever important?

As I said, ffvhuff uses a different set of vlc tables on each frame, and 
spends a couple percent of its time in init_vlc().
And ffv2 (my experimental codec that I have mentioned before but not 
yet proposed as a patch) changes vlc tables less frequently but has many 
more of them, spending a total of up to 30% of its time in init_vlc (prior 
to this optimization).

--Loren Merritt