[FFmpeg-devel] [PATCH] Add negate filter.

Stefano Sabatini stefano.sabatini-lala
Thu Dec 2 20:45:24 CET 2010


On date Wednesday 2010-12-01 20:57:19 +0100, Stefano Sabatini encoded:
> On date Wednesday 2010-12-01 03:25:47 +0100, Michael Niedermayer encoded:
> > On Tue, Nov 30, 2010 at 11:22:43PM +0100, Stefano Sabatini wrote:
> > > > From 3c16bf49c0f9f4c3c72d9eea49ae35a47d58d961 Mon Sep 17 00:00:00 2001
> > > > From: Stefano Sabatini <stefano.sabatini-lala at poste.it>
> > > > Date: Fri, 26 Nov 2010 17:31:11 +0100
> > > > Subject: [PATCH] Add negate filter.
> > > > 
> > > > Ported from the libavfilter-soc repo with per-component negation
> > > > addition.
> > > > ---
> > > >  doc/filters.texi         |   22 ++++++
> > > >  libavfilter/Makefile     |    1 +
> > > >  libavfilter/allfilters.c |    1 +
> > > >  libavfilter/vf_negate.c  |  184 ++++++++++++++++++++++++++++++++++++++++++++++
> > > >  4 files changed, 208 insertions(+), 0 deletions(-)
> > > >  create mode 100644 libavfilter/vf_negate.c
> > > 
> > > I'll apply in three days unless objections.
> > 
> > is it faster than using a LUT ?
> 
> 32246490 dezicycles in nolut, 1 runs, 0 skips
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> 37591370 dezicycles in nolut, 512 runs, 0 skips
> 37119779 dezicycles in nolut, 1024 runs, 0 skips
> 37390082 dezicycles in nolut, 2048 runs, 0 skips
> 
> 22483590 dezicycles in lut, 1 runs, 0 skips
> 16486965 dezicycles in lut, 2 runs, 0 skips
> 14703345 dezicycles in lut, 4 runs, 0 skips
> 13340126 dezicycles in lut, 8 runs, 0 skips
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> 17345394 dezicycles in lut, 32 runs, 0 skips
> 18178503 dezicycles in lut, 64 runs, 0 skips
> 18047690 dezicycles in lut, 128 runs, 0 skips
> 18159589 dezicycles in lut, 256 runs, 0 skips
> 17833263 dezicycles in lut, 512 runs, 0 skips
> 17624724 dezicycles in lut, 1024 runs, 0 skips
> 17303343 dezicycles in lut, 2048 runs, 0 skips
> 
> Updated (with some simplifications).
[...]

I'll apply in few days if there are no more comments.
-- 
FFmpeg = Frenzy and Furious Merciful Pacific Eccentric Glue



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