On Sun, Mar 20, 2016 at 12:00:13PM +0100, Gerion Entrup wrote: > Good day, > > I attached the patch. The MPEG7 video signature is a method to calculate a > fingerprint of a video and to compare two or more of this fingerprints. Most > of > the standard is implemented. I've done this work as part of my bachelor > thesis. > > The method is designed mainly for fast caculation of the fingerprint, so it > is > blockbased and not very robust to some geometric modification. >
> Further details can be found at > http://epubs.surrey.ac.uk/531590/1/MPEG-7%20Video%20Signature%20Author%27s > %20Copy.pdf use a @see in the code (typically in the @file section) > > kind regards, > Gerion > From 6eeb0a8b4fce06d98265ce2cf1936ff092de137b Mon Sep 17 00:00:00 2001 > From: Gerion Entrup <gerion.ent...@flump.de> > Date: Sun, 20 Mar 2016 11:10:31 +0100 > Subject: [PATCH] add signature filter for MPEG7 video signature > > This filter does not implement all features of MPEG7. Missing features: > - binary output > - compression of signature files > - work only on (cropped) parts of the video > --- > Changelog | 1 + > doc/filters.texi | 50 ++++ > libavfilter/Makefile | 1 + > libavfilter/allfilters.c | 1 + > libavfilter/signature.h | 569 ++++++++++++++++++++++++++++++++++++ > libavfilter/signature_lookup.c | 518 +++++++++++++++++++++++++++++++++ > libavfilter/version.h | 4 +- > libavfilter/vf_signature.c | 636 > +++++++++++++++++++++++++++++++++++++++++ > 8 files changed, 1778 insertions(+), 2 deletions(-) > create mode 100644 libavfilter/signature.h > create mode 100644 libavfilter/signature_lookup.c > create mode 100644 libavfilter/vf_signature.c > > diff --git a/Changelog b/Changelog > index 1f57f5e..7c1316a 100644 > --- a/Changelog > +++ b/Changelog > @@ -2,6 +2,7 @@ Entries are sorted chronologically from oldest to youngest > within each release, > releases are sorted from youngest to oldest. > > version <next>: > +- MPEG-7 Video Signature filter belongs at the end of the list > - DXVA2-accelerated HEVC Main10 decoding > - fieldhint filter > - loop video filter and aloop audio filter > diff --git a/doc/filters.texi b/doc/filters.texi > index c093927..22d6326 100644 > --- a/doc/filters.texi > +++ b/doc/filters.texi > @@ -11444,6 +11444,56 @@ saturation maximum: > %@{metadata:lavfi.signalstats.SATMAX@} > @end example > @end itemize > > +@anchor{signature} > +@section signature > + > +Calculates the MPEG-7 Video Signature. The filter could handle more than one > input. In this case the matching between the inputs could be calculated. The > filter passthrough the first input. The output is written in XML. > + please wrap the text, same below [...] > diff --git a/libavfilter/Makefile b/libavfilter/Makefile > index 956a077..f48eeaf 100644 > --- a/libavfilter/Makefile > +++ b/libavfilter/Makefile > @@ -245,6 +245,7 @@ OBJS-$(CONFIG_SHOWPALETTE_FILTER) += > vf_showpalette.o > OBJS-$(CONFIG_SHUFFLEFRAMES_FILTER) += vf_shuffleframes.o > OBJS-$(CONFIG_SHUFFLEPLANES_FILTER) += vf_shuffleplanes.o > OBJS-$(CONFIG_SIGNALSTATS_FILTER) += vf_signalstats.o > +OBJS-$(CONFIG_SIGNATURE_FILTER) += vf_signature.o > OBJS-$(CONFIG_SMARTBLUR_FILTER) += vf_smartblur.o > OBJS-$(CONFIG_SPLIT_FILTER) += split.o > OBJS-$(CONFIG_SPP_FILTER) += vf_spp.o > diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c > index e5080b5..c8ded07 100644 > --- a/libavfilter/allfilters.c > +++ b/libavfilter/allfilters.c > @@ -265,6 +265,7 @@ void avfilter_register_all(void) > REGISTER_FILTER(SHUFFLEFRAMES, shuffleframes, vf); > REGISTER_FILTER(SHUFFLEPLANES, shuffleplanes, vf); > REGISTER_FILTER(SIGNALSTATS, signalstats, vf); > + REGISTER_FILTER(SIGNATURE, signature, vf); > REGISTER_FILTER(SMARTBLUR, smartblur, vf); > REGISTER_FILTER(SPLIT, split, vf); > REGISTER_FILTER(SPP, spp, vf); > diff --git a/libavfilter/signature.h b/libavfilter/signature.h > new file mode 100644 > index 0000000..6f0584b > --- /dev/null > +++ b/libavfilter/signature.h > @@ -0,0 +1,569 @@ > +/* > + * Copyright (c) 2016 Gerion Entrup > + * > + * This file is part of FFmpeg. > + * > + * FFmpeg is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * FFmpeg is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License along > + * with FFmpeg; if not, write to the Free Software Foundation, Inc., > + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. > + */ > + GPL? > +/** > + * @file > + * MPEG-7 video signature calculation and lookup filter > + */ > + > +#include <float.h> > +#include "libavutil/opt.h" > +#include "libavutil/timestamp.h" > +#include "avfilter.h" > +#include "internal.h" > +#include <stdbool.h> please no, use ints. [...] I'll eventually make a more complete review at the next iteration. -- Clément B.
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