theora dev - Jul 2007 - PostProcessingLevel field of PB_INSTANCE

What is the PostProcessingLevel field of PB_INSTANCE?

When is it used?

It is used for all Theora's video or it is just for legacy support with VP3?


Thanks

-- 
Leonardo de Paula Rosa Piga
Undergraduate Computer Engineering Student
LSC - IC - UNICAMP
http://www.students.ic.unicamp.br/~ra033956

Quoting Leonardo de Paula Rosa Piga <lpiga@terra.com.br>:
> What is the PostProcessingLevel field of PB_INSTANCE?
>
> When is it used?
>
> It is used for all Theora's video or it is just for legacy support with
VP3?
PostProcessingLevel enables post-processing filters on the final decoded frames
(de-blocking and de-ringing). These help improve image quality, but are very
computationally intensive due to the number of memory accesses required, and so
are disabled by default (PostProcessingLevel=0). See pp.c for details. The old
libtheora API did not expose any method of changing this default value.

The new theora-exp decoder (now in mainline svn) exposes an API for dynamically
setting the post-processing level (e.g., according to available CPU time). See
TH_DECCTL_GET_PPLEVEL_MAX and TH_DECCTL_SET_PPLEVEL in theoradec.h or at
http://people.xiph.org/~tterribe/doc/libtheora-exp/theoradec_8h.html#decctlcodes