[FFmpeg-cvslog] add signature filter for MPEG7 video signature
Gerion Entrup
git at videolan.org
Tue Mar 21 01:12:02 EET 2017
ffmpeg | branch: master | Gerion Entrup <gerion.entrup at flump.de> | Mon Jan 2 02:08:57 2017 +0100| [5e3a418b6047acd848698c4bb4bf0c1b73526744] | committer: Michael Niedermayer
add signature filter for MPEG7 video signature
This filter does not implement all features of MPEG7. Missing features:
- compression of signature files
- work only on (cropped) parts of the video
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5e3a418b6047acd848698c4bb4bf0c1b73526744
---
Changelog | 1 +
configure | 1 +
doc/filters.texi | 89 +++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/signature.h | 569 ++++++++++++++++++++++++++++++
libavfilter/signature_lookup.c | 573 ++++++++++++++++++++++++++++++
libavfilter/version.h | 2 +-
libavfilter/vf_signature.c | 767 +++++++++++++++++++++++++++++++++++++++++
9 files changed, 2003 insertions(+), 1 deletion(-)
diff --git a/Changelog b/Changelog
index bc434fe..5bcf8f1 100644
--- a/Changelog
+++ b/Changelog
@@ -30,6 +30,7 @@ version <next>:
- Support MOV with multiple sample description tables
- XPM decoder
- Removed the legacy X11 screen grabber, use XCB instead
+- MPEG-7 Video Signature filter
version 3.2:
diff --git a/configure b/configure
index d4cfe1a..a9ea698 100755
--- a/configure
+++ b/configure
@@ -3139,6 +3139,7 @@ showspectrum_filter_deps="avcodec"
showspectrum_filter_select="fft"
showspectrumpic_filter_deps="avcodec"
showspectrumpic_filter_select="fft"
+signature_filter_deps="gpl avcodec avformat"
smartblur_filter_deps="gpl swscale"
sofalizer_filter_deps="netcdf avcodec"
sofalizer_filter_select="fft"
diff --git a/doc/filters.texi b/doc/filters.texi
index 950ff81..b62952a 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -12660,6 +12660,95 @@ saturation maximum: %@{metadata:lavfi.signalstats.SATMAX@}
@end example
@end itemize
+ at anchor{signature}
+ at section signature
+
+Calculates the MPEG-7 Video Signature. The filter can handle more than one
+input. In this case the matching between the inputs can be calculated additionally.
+The filter always passes through the first input. The signature of each stream can
+be written into a file.
+
+It accepts the following options:
+
+ at table @option
+ at item detectmode
+Enable or disable the matching process.
+
+Available values are:
+
+ at table @samp
+ at item off
+Disable the calculation of a matching (default).
+ at item full
+Calculate the matching for the whole video and output whether the whole video
+matches or only parts.
+ at item fast
+Calculate only until a matching is found or the video ends. Should be faster in
+some cases.
+ at end table
+
+ at item nb_inputs
+Set the number of inputs. The option value must be a non negative integer.
+Default value is 1.
+
+ at item filename
+Set the path to which the output is written. If there is more than one input,
+the path must be a prototype, i.e. must contain %d or %0nd (where n is a positive
+integer), that will be replaced with the input number. If no filename is
+specified, no output will be written. This is the default.
+
+ at item format
+Choose the output format.
+
+Available values are:
+
+ at table @samp
+ at item binary
+Use the specified binary representation (default).
+ at item xml
+Use the specified xml representation.
+ at end table
+
+ at item th_d
+Set threshold to detect one word as similar. The option value must be an integer
+greater than zero. The default value is 9000.
+
+ at item th_dc
+Set threshold to detect all words as similar. The option value must be an integer
+greater than zero. The default value is 60000.
+
+ at item th_xh
+Set threshold to detect frames as similar. The option value must be an integer
+greater than zero. The default value is 116.
+
+ at item th_di
+Set the minimum length of a sequence in frames to recognize it as matching
+sequence. The option value must be a non negative integer value.
+The default value is 0.
+
+ at item th_it
+Set the minimum relation, that matching frames to all frames must have.
+The option value must be a double value between 0 and 1. The default value is 0.5.
+ at end table
+
+ at subsection Examples
+
+ at itemize
+ at item
+To calculate the signature of an input video and store it in signature.bin:
+ at example
+ffmpeg -i input.mkv -vf signature=filename=signature.bin -map 0:v -f null -
+ at end example
+
+ at item
+To detect whether two videos match and store the signatures in XML format in
+signature0.xml and signature1.xml:
+ at example
+ffmpeg -i input1.mkv -i input2.mkv -filter_complex "[0:v][1:v] signature=nb_inputs=2:detectmode=full:format=xml:filename=signature%d.xml" -map :v -f null -
+ at end example
+
+ at end itemize
+
@anchor{smartblur}
@section smartblur
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 428251f..a48ca0a 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -280,6 +280,7 @@ OBJS-$(CONFIG_SHUFFLEFRAMES_FILTER) += vf_shuffleframes.o
OBJS-$(CONFIG_SHUFFLEPLANES_FILTER) += vf_shuffleplanes.o
OBJS-$(CONFIG_SIDEDATA_FILTER) += f_sidedata.o
OBJS-$(CONFIG_SIGNALSTATS_FILTER) += vf_signalstats.o
+OBJS-$(CONFIG_SIGNATURE_FILTER) += vf_signature.o
OBJS-$(CONFIG_SMARTBLUR_FILTER) += vf_smartblur.o
OBJS-$(CONFIG_SOBEL_FILTER) += vf_convolution.o
OBJS-$(CONFIG_SPLIT_FILTER) += split.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 2bf34ef..93271fb 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -290,6 +290,7 @@ static void register_all(void)
REGISTER_FILTER(SHUFFLEPLANES, shuffleplanes, vf);
REGISTER_FILTER(SIDEDATA, sidedata, vf);
REGISTER_FILTER(SIGNALSTATS, signalstats, vf);
+ REGISTER_FILTER(SIGNATURE, signature, vf);
REGISTER_FILTER(SMARTBLUR, smartblur, vf);
REGISTER_FILTER(SOBEL, sobel, vf);
REGISTER_FILTER(SPLIT, split, vf);
diff --git a/libavfilter/signature.h b/libavfilter/signature.h
new file mode 100644
index 0000000..2659c87
--- /dev/null
+++ b/libavfilter/signature.h
@@ -0,0 +1,569 @@
+/*
+ * Copyright (c) 2017 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.
+ */
+
+/**
+ * @file
+ * MPEG-7 video signature calculation and lookup filter
+ */
+
+#ifndef AVFILTER_SIGNATURE_H
+#define AVFILTER_SIGNATURE_H
+
+#include <float.h>
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+#include "libavutil/timestamp.h"
+#include "avfilter.h"
+#include "internal.h"
+
+#define ELEMENT_COUNT 10
+#define SIGELEM_SIZE 380
+#define DIFFELEM_SIZE 348 /* SIGELEM_SIZE - elem_a1 - elem_a2 */
+#define COARSE_SIZE 90
+
+enum lookup_mode {
+ MODE_OFF,
+ MODE_FULL,
+ MODE_FAST,
+ NB_LOOKUP_MODE
+};
+
+enum formats {
+ FORMAT_BINARY,
+ FORMAT_XML,
+ NB_FORMATS
+};
+
+typedef struct {
+ uint8_t x;
+ uint8_t y;
+} Point;
+
+typedef struct {
+ Point up;
+ Point to;
+} Block;
+
+typedef struct {
+ int av_elem; /* average element category */
+ short left_count; /* count of blocks that will be added together */
+ short block_count; /* count of blocks per element */
+ short elem_count;
+ const Block* blocks;
+} ElemCat;
+
+typedef struct FineSignature {
+ struct FineSignature* next;
+ struct FineSignature* prev;
+ uint64_t pts;
+ uint32_t index; /* needed for xmlexport */
+ uint8_t confidence;
+ uint8_t words[5];
+ uint8_t framesig[SIGELEM_SIZE/5];
+} FineSignature;
+
+typedef struct CoarseSignature {
+ uint8_t data[5][31]; /* 5 words with min. 243 bit */
+ struct FineSignature* first; /* associated Finesignatures */
+ struct FineSignature* last;
+ struct CoarseSignature* next;
+} CoarseSignature;
+
+/* lookup types */
+typedef struct MatchingInfo {
+ double meandist;
+ double framerateratio; /* second/first */
+ int score;
+ int offset;
+ int matchframes; /* number of matching frames */
+ int whole;
+ struct FineSignature* first;
+ struct FineSignature* second;
+ struct MatchingInfo* next;
+} MatchingInfo;
+
+typedef struct {
+ AVRational time_base;
+ /* needed for xml_export */
+ int w; /* height */
+ int h; /* width */
+
+ /* overflow protection */
+ int divide;
+
+ FineSignature* finesiglist;
+ FineSignature* curfinesig;
+
+ CoarseSignature* coarsesiglist;
+ CoarseSignature* coarseend; /* needed for xml export */
+ /* helpers to store the alternating signatures */
+ CoarseSignature* curcoarsesig1;
+ CoarseSignature* curcoarsesig2;
+
+ int coarsecount; /* counter from 0 to 89 */
+ int midcoarse; /* whether it is a coarsesignature beginning from 45 + i * 90 */
+ uint32_t lastindex; /* helper to store amount of frames */
+
+ int exported; /* boolean whether stream already exported */
+} StreamContext;
+
+typedef struct {
+ const AVClass *class;
+ /* input parameters */
+ int mode;
+ int nb_inputs;
+ char *filename;
+ int format;
+ int thworddist;
+ int thcomposdist;
+ int thl1;
+ int thdi;
+ int thit;
+ /* end input parameters */
+
+ uint8_t l1distlut[243*242/2]; /* 243 + 242 + 241 ... */
+ StreamContext* streamcontexts;
+} SignatureContext;
+
+
+static const Block elem_a1_data[] = {
+ {{ 0, 0},{ 7, 7}},
+ {{ 8, 0},{15, 7}},
+ {{ 0, 8},{ 7,15}},
+ {{ 8, 8},{15,15}},
+ {{16, 0},{23, 7}},
+ {{24, 0},{31, 7}},
+ {{16, 8},{23,15}},
+ {{24, 8},{31,15}},
+ {{ 0,16},{ 7,23}},
+ {{ 8,16},{15,23}},
+ {{ 0,24},{ 7,31}},
+ {{ 8,24},{15,31}},
+ {{16,16},{23,23}},
+ {{24,16},{31,23}},
+ {{16,24},{23,31}},
+ {{24,24},{31,31}},
+ {{ 0, 0},{15,15}},
+ {{16, 0},{31,15}},
+ {{ 0,16},{15,31}},
+ {{16,16},{31,31}}
+};
+static const ElemCat elem_a1 = { 1, 1, 1, 20, elem_a1_data };
+
+static const Block elem_a2_data[] = {
+ {{ 2, 2},{ 9, 9}},
+ {{12, 2},{19, 9}},
+ {{22, 2},{29, 9}},
+ {{ 2,12},{ 9,19}},
+ {{12,12},{19,19}},
+ {{22,12},{29,19}},
+ {{ 2,22},{ 9,29}},
+ {{12,22},{19,29}},
+ {{22,22},{29,29}},
+ {{ 9, 9},{22,22}},
+ {{ 6, 6},{25,25}},
+ {{ 3, 3},{28,28}}
+};
+static const ElemCat elem_a2 = { 1, 1, 1, 12, elem_a2_data };
+
+static const Block elem_d1_data[] = {
+ {{ 0, 0},{ 1, 3}},{{ 2, 0},{ 3, 3}},
+ {{ 4, 0},{ 7, 1}},{{ 4, 2},{ 7, 3}},
+ {{ 0, 6},{ 3, 7}},{{ 0, 4},{ 3, 5}},
+ {{ 6, 4},{ 7, 7}},{{ 4, 4},{ 5, 7}},
+ {{ 8, 0},{ 9, 3}},{{10, 0},{11, 3}},
+ {{12, 0},{15, 1}},{{12, 2},{15, 3}},
+ {{ 8, 6},{11, 7}},{{ 8, 4},{11, 5}},
+ {{14, 4},{15, 7}},{{12, 4},{13, 7}},
+ {{ 0, 8},{ 1,11}},{{ 2, 8},{ 3,11}},
+ {{ 4, 8},{ 7, 9}},{{ 4,10},{ 7,11}},
+ {{ 0,14},{ 3,15}},{{ 0,12},{ 3,13}},
+ {{ 6,12},{ 7,15}},{{ 4,12},{ 5,15}},
+ {{ 8, 8},{ 9,11}},{{10, 8},{11,11}},
+ {{12, 8},{15, 9}},{{12,10},{15,11}},
+ {{ 8,14},{11,15}},{{ 8,12},{11,13}},
+ {{14,12},{15,15}},{{12,12},{13,15}},
+ {{16, 0},{19, 1}},{{16, 2},{19, 3}},
+ {{22, 0},{23, 3}},{{20, 0},{21, 3}},
+ {{16, 4},{17, 7}},{{18, 4},{19, 7}},
+ {{20, 6},{23, 7}},{{20, 4},{23, 5}},
+ {{24, 0},{27, 1}},{{24, 2},{27, 3}},
+ {{30, 0},{31, 3}},{{28, 0},{29, 3}},
+ {{24, 4},{25, 7}},{{26, 4},{27, 7}},
+ {{28, 6},{31, 7}},{{28, 4},{31, 5}},
+ {{16, 8},{19, 9}},{{16,10},{19,11}},
+ {{22, 8},{23,11}},{{20, 8},{21,11}},
+ {{16,12},{17,15}},{{18,12},{19,15}},
+ {{20,14},{23,15}},{{20,12},{23,13}},
+ {{24, 8},{27, 9}},{{24,10},{27,11}},
+ {{30, 8},{31,11}},{{28, 8},{29,11}},
+ {{24,12},{25,15}},{{26,12},{27,15}},
+ {{28,14},{31,15}},{{28,12},{31,13}},
+ {{ 0,16},{ 3,17}},{{ 0,18},{ 3,19}},
+ {{ 6,16},{ 7,19}},{{ 4,16},{ 5,19}},
+ {{ 0,20},{ 1,23}},{{ 2,20},{ 3,23}},
+ {{ 4,22},{ 7,23}},{{ 4,20},{ 7,21}},
+ {{ 8,16},{11,17}},{{ 8,18},{11,19}},
+ {{14,16},{15,19}},{{12,16},{13,19}},
+ {{ 8,20},{ 9,23}},{{10,20},{11,23}},
+ {{12,22},{15,23}},{{12,20},{15,21}},
+ {{ 0,24},{ 3,25}},{{ 0,26},{ 3,27}},
+ {{ 6,24},{ 7,27}},{{ 4,24},{ 5,27}},
+ {{ 0,28},{ 1,31}},{{ 2,28},{ 3,31}},
+ {{ 4,30},{ 7,31}},{{ 4,28},{ 7,29}},
+ {{ 8,24},{11,25}},{{ 8,26},{11,27}},
+ {{14,24},{15,27}},{{12,24},{13,27}},
+ {{ 8,28},{ 9,31}},{{10,28},{11,31}},
+ {{12,30},{15,31}},{{12,28},{15,29}},
+ {{16,16},{17,19}},{{18,16},{19,19}},
+ {{20,16},{23,17}},{{20,18},{23,19}},
+ {{16,22},{19,23}},{{16,20},{19,21}},
+ {{22,20},{23,23}},{{20,20},{21,23}},
+ {{24,16},{25,19}},{{26,16},{27,19}},
+ {{28,16},{31,17}},{{28,18},{31,19}},
+ {{24,22},{27,23}},{{24,20},{27,21}},
+ {{30,20},{31,23}},{{28,20},{29,23}},
+ {{16,24},{17,27}},{{18,24},{19,27}},
+ {{20,24},{23,25}},{{20,26},{23,27}},
+ {{16,30},{19,31}},{{16,28},{19,29}},
+ {{22,28},{23,31}},{{20,28},{21,31}},
+ {{24,24},{25,27}},{{26,24},{27,27}},
+ {{28,24},{31,25}},{{28,26},{31,27}},
+ {{24,30},{27,31}},{{24,28},{27,29}},
+ {{30,28},{31,31}},{{28,28},{29,31}},
+ {{ 2, 2},{ 3, 5}},{{ 4, 2},{ 5, 5}},
+ {{ 6, 2},{ 9, 3}},{{ 6, 4},{ 9, 5}},
+ {{ 2, 8},{ 5, 9}},{{ 2, 6},{ 5, 7}},
+ {{ 8, 6},{ 9, 9}},{{ 6, 6},{ 7, 9}},
+ {{12, 2},{13, 5}},{{14, 2},{15, 5}},
+ {{16, 2},{19, 3}},{{16, 4},{19, 5}},
+ {{12, 8},{15, 9}},{{12, 6},{15, 7}},
+ {{18, 6},{19, 9}},{{16, 6},{17, 9}},
+ {{22, 2},{23, 5}},{{24, 2},{25, 5}},
+ {{26, 2},{29, 3}},{{26, 4},{29, 5}},
+ {{22, 8},{25, 9}},{{22, 6},{25, 7}},
+ {{28, 6},{29, 9}},{{26, 6},{27, 9}},
+ {{ 2,12},{ 3,15}},{{ 4,12},{ 5,15}},
+ {{ 6,12},{ 9,13}},{{ 6,14},{ 9,15}},
+ {{ 2,18},{ 5,19}},{{ 2,16},{ 5,17}},
+ {{ 8,16},{ 9,19}},{{ 6,16},{ 7,19}},
+ {{12,12},{15,13}},{{12,14},{15,15}},
+ {{16,12},{19,13}},{{16,14},{19,15}},
+ {{12,18},{15,19}},{{12,16},{15,17}},
+ {{16,18},{19,19}},{{16,16},{19,17}},
+ {{22,12},{23,15}},{{24,12},{25,15}},
+ {{26,12},{29,13}},{{26,14},{29,15}},
+ {{22,18},{25,19}},{{22,16},{25,17}},
+ {{28,16},{29,19}},{{26,16},{27,19}},
+ {{ 2,22},{ 3,25}},{{ 4,22},{ 5,25}},
+ {{ 6,22},{ 9,23}},{{ 6,24},{ 9,25}},
+ {{ 2,28},{ 5,29}},{{ 2,26},{ 5,27}},
+ {{ 8,26},{ 9,29}},{{ 6,26},{ 7,29}},
+ {{12,22},{13,25}},{{14,22},{15,25}},
+ {{16,22},{19,23}},{{16,24},{19,25}},
+ {{12,28},{15,29}},{{12,26},{15,27}},
+ {{18,26},{19,29}},{{16,26},{17,29}},
+ {{22,22},{23,25}},{{24,22},{25,25}},
+ {{26,22},{29,23}},{{26,24},{29,25}},
+ {{22,28},{25,29}},{{22,26},{25,27}},
+ {{28,26},{29,29}},{{26,26},{27,29}},
+ {{ 7, 7},{10, 8}},{{ 7, 9},{10,10}},
+ {{11, 7},{12,10}},{{13, 7},{14,10}},
+ {{ 7,11},{ 8,14}},{{ 9,11},{10,14}},
+ {{11,11},{14,12}},{{11,13},{14,14}},
+ {{17, 7},{20, 8}},{{17, 9},{20,10}},
+ {{21, 7},{22,10}},{{23, 7},{24,10}},
+ {{17,11},{18,14}},{{19,11},{20,14}},
+ {{21,11},{24,12}},{{21,13},{24,14}},
+ {{ 7,17},{10,18}},{{ 7,19},{10,20}},
+ {{11,17},{12,20}},{{13,17},{14,20}},
+ {{ 7,21},{ 8,24}},{{ 9,21},{10,24}},
+ {{11,21},{14,22}},{{11,23},{14,24}},
+ {{17,17},{20,18}},{{17,19},{20,20}},
+ {{21,17},{22,20}},{{23,17},{24,20}},
+ {{17,21},{18,24}},{{19,21},{20,24}},
+ {{21,21},{24,22}},{{21,23},{24,24}}
+};
+static const ElemCat elem_d1 = { 0, 1, 2, 116, elem_d1_data };
+
+static const Block elem_d2_data[] = {
+ {{ 0, 0},{ 3, 3}},{{ 4, 4},{ 7, 7}},{{ 4, 0},{ 7, 3}},{{ 0, 4},{ 3, 7}},
+ {{ 8, 0},{11, 3}},{{12, 4},{15, 7}},{{12, 0},{15, 3}},{{ 8, 4},{11, 7}},
+ {{16, 0},{19, 3}},{{20, 4},{23, 7}},{{20, 0},{23, 3}},{{16, 4},{19, 7}},
+ {{24, 0},{27, 3}},{{28, 4},{31, 7}},{{28, 0},{31, 3}},{{24, 4},{27, 7}},
+ {{ 0, 8},{ 3,11}},{{ 4,12},{ 7,15}},{{ 4, 8},{ 7,11}},{{ 0,12},{ 3,15}},
+ {{ 8, 8},{11,11}},{{12,12},{15,15}},{{12, 8},{15,11}},{{ 8,12},{11,15}},
+ {{16, 8},{19,11}},{{20,12},{23,15}},{{20, 8},{23,11}},{{16,12},{19,15}},
+ {{24, 8},{27,11}},{{28,12},{31,15}},{{28, 8},{31,11}},{{24,12},{27,15}},
+ {{ 0,16},{ 3,19}},{{ 4,20},{ 7,23}},{{ 4,16},{ 7,19}},{{ 0,20},{ 3,23}},
+ {{ 8,16},{11,19}},{{12,20},{15,23}},{{12,16},{15,19}},{{ 8,20},{11,23}},
+ {{16,16},{19,19}},{{20,20},{23,23}},{{20,16},{23,19}},{{16,20},{19,23}},
+ {{24,16},{27,19}},{{28,20},{31,23}},{{28,16},{31,19}},{{24,20},{27,23}},
+ {{ 0,24},{ 3,27}},{{ 4,28},{ 7,31}},{{ 4,24},{ 7,27}},{{ 0,28},{ 3,31}},
+ {{ 8,24},{11,27}},{{12,28},{15,31}},{{12,24},{15,27}},{{ 8,28},{11,31}},
+ {{16,24},{19,27}},{{20,28},{23,31}},{{20,24},{23,27}},{{16,28},{19,31}},
+ {{24,24},{27,27}},{{28,28},{31,31}},{{28,24},{31,27}},{{24,28},{27,31}},
+ {{ 4, 4},{ 7, 7}},{{ 8, 8},{11,11}},{{ 8, 4},{11, 7}},{{ 4, 8},{ 7,11}},
+ {{12, 4},{15, 7}},{{16, 8},{19,11}},{{16, 4},{19, 7}},{{12, 8},{15,11}},
+ {{20, 4},{23, 7}},{{24, 8},{27,11}},{{24, 4},{27, 7}},{{20, 8},{23,11}},
+ {{ 4,12},{ 7,15}},{{ 8,16},{11,19}},{{ 8,12},{11,15}},{{ 4,16},{ 7,19}},
+ {{12,12},{15,15}},{{16,16},{19,19}},{{16,12},{19,15}},{{12,16},{15,19}},
+ {{20,12},{23,15}},{{24,16},{27,19}},{{24,12},{27,15}},{{20,16},{23,19}},
+ {{ 4,20},{ 7,23}},{{ 8,24},{11,27}},{{ 8,20},{11,23}},{{ 4,24},{ 7,27}},
+ {{12,20},{15,23}},{{16,24},{19,27}},{{16,20},{19,23}},{{12,24},{15,27}},
+ {{20,20},{23,23}},{{24,24},{27,27}},{{24,20},{27,23}},{{20,24},{23,27}}
+};
+static const ElemCat elem_d2 = { 0, 2, 4, 25, elem_d2_data };
+
+static const Block elem_d3_data[] = {
+ {{ 1, 1},{10,10}},{{11, 1},{20,10}},
+ {{ 1, 1},{10,10}},{{21, 1},{30,10}},
+ {{ 1, 1},{10,10}},{{ 1,11},{10,20}},
+ {{ 1, 1},{10,10}},{{11,11},{20,20}},
+ {{ 1, 1},{10,10}},{{21,11},{30,20}},
+ {{ 1, 1},{10,10}},{{ 1,21},{10,30}},
+ {{ 1, 1},{10,10}},{{11,21},{20,30}},
+ {{ 1, 1},{10,10}},{{21,21},{30,30}},
+ {{11, 1},{20,10}},{{21, 1},{30,10}},
+ {{11, 1},{20,10}},{{ 1,11},{10,20}},
+ {{11, 1},{20,10}},{{11,11},{20,20}},
+ {{11, 1},{20,10}},{{21,11},{30,20}},
+ {{11, 1},{20,10}},{{ 1,21},{10,30}},
+ {{11, 1},{20,10}},{{11,21},{20,30}},
+ {{11, 1},{20,10}},{{21,21},{30,30}},
+ {{21, 1},{30,10}},{{ 1,11},{10,20}},
+ {{21, 1},{30,10}},{{11,11},{20,20}},
+ {{21, 1},{30,10}},{{21,11},{30,20}},
+ {{21, 1},{30,10}},{{ 1,21},{10,30}},
+ {{21, 1},{30,10}},{{11,21},{20,30}},
+ {{21, 1},{30,10}},{{21,21},{30,30}},
+ {{ 1,11},{10,20}},{{11,11},{20,20}},
+ {{ 1,11},{10,20}},{{21,11},{30,20}},
+ {{ 1,11},{10,20}},{{ 1,21},{10,30}},
+ {{ 1,11},{10,20}},{{11,21},{20,30}},
+ {{ 1,11},{10,20}},{{21,21},{30,30}},
+ {{11,11},{20,20}},{{21,11},{30,20}},
+ {{11,11},{20,20}},{{ 1,21},{10,30}},
+ {{11,11},{20,20}},{{11,21},{20,30}},
+ {{11,11},{20,20}},{{21,21},{30,30}},
+ {{21,11},{30,20}},{{ 1,21},{10,30}},
+ {{21,11},{30,20}},{{11,21},{20,30}},
+ {{21,11},{30,20}},{{21,21},{30,30}},
+ {{ 1,21},{10,30}},{{11,21},{20,30}},
+ {{ 1,21},{10,30}},{{21,21},{30,30}},
+ {{11,21},{20,30}},{{21,21},{30,30}}
+};
+static const ElemCat elem_d3 = { 0, 1, 2, 36, elem_d3_data };
+
+static const Block elem_d4_data[] = {
+ {{ 7,13},{12,18}},{{19,13},{24,18}},
+ {{13, 7},{18,12}},{{13,19},{18,24}},
+ {{ 7, 7},{12,12}},{{19,19},{24,24}},
+ {{19, 7},{24,12}},{{ 7,19},{12,24}},
+ {{13, 7},{18,12}},{{19,13},{24,18}},
+ {{19,13},{24,18}},{{13,19},{18,24}},
+ {{13,19},{18,24}},{{ 7,13},{12,18}},
+ {{ 7,13},{12,18}},{{13, 7},{18,12}},
+ {{ 7, 7},{12,12}},{{19, 7},{24,12}},
+ {{19, 7},{24,12}},{{19,19},{24,24}},
+ {{19,19},{24,24}},{{ 7,19},{12,24}},
+ {{ 7,19},{12,24}},{{ 7, 7},{12,12}},
+ {{13,13},{18,18}},{{13, 1},{18, 6}},
+ {{13,13},{18,18}},{{25,13},{30,18}},
+ {{13,13},{18,18}},{{13,25},{18,30}},
+ {{13,13},{18,18}},{{ 1,13},{ 6,18}},
+ {{13, 1},{18, 6}},{{13,25},{18,30}},
+ {{ 1,13},{ 6,18}},{{25,13},{30,18}},
+ {{ 7, 1},{12, 6}},{{19, 1},{24, 6}},
+ {{ 7,25},{12,30}},{{19,25},{24,30}},
+ {{ 1, 7},{ 6,12}},{{ 1,19},{ 6,24}},
+ {{25, 7},{30,12}},{{25,19},{30,24}},
+ {{ 7, 1},{12, 6}},{{ 1, 7},{ 6,12}},
+ {{19, 1},{24, 6}},{{25, 7},{30,12}},
+ {{25,19},{30,24}},{{19,25},{24,30}},
+ {{ 1,19},{ 6,24}},{{ 7,25},{12,30}},
+ {{ 1, 1},{ 6, 6}},{{25, 1},{30, 6}},
+ {{25, 1},{30, 6}},{{25,25},{30,30}},
+ {{25,25},{30,30}},{{ 1,25},{ 6,30}},
+ {{ 1,25},{ 6,30}},{{ 1, 1},{ 6, 6}}
+};
+static const ElemCat elem_d4 = { 0, 1, 2, 30, elem_d4_data };
+
+static const Block elem_d5_data[] = {
+ {{ 1, 1},{10, 3}},{{ 1, 4},{ 3, 7}},{{ 8, 4},{10, 7}},{{ 1, 8},{10,10}},{{ 4, 4},{ 7, 7}},
+ {{11, 1},{20, 3}},{{11, 4},{13, 7}},{{18, 4},{20, 7}},{{11, 8},{20,10}},{{14, 4},{17, 7}},
+ {{21, 1},{30, 3}},{{21, 4},{23, 7}},{{28, 4},{30, 7}},{{21, 8},{30,10}},{{24, 4},{27, 7}},
+ {{ 1,11},{10,13}},{{ 1,14},{ 3,17}},{{ 8,14},{10,17}},{{ 1,18},{10,20}},{{ 4,14},{ 7,17}},
+ {{11,11},{20,13}},{{11,14},{13,17}},{{18,14},{20,17}},{{11,18},{20,20}},{{14,14},{17,17}},
+ {{21,11},{30,13}},{{21,14},{23,17}},{{28,14},{30,17}},{{21,18},{30,20}},{{24,14},{27,17}},
+ {{ 1,21},{10,23}},{{ 1,24},{ 3,27}},{{ 8,24},{10,27}},{{ 1,28},{10,30}},{{ 4,24},{ 7,27}},
+ {{11,21},{20,23}},{{11,24},{13,27}},{{18,24},{20,27}},{{11,28},{20,30}},{{14,24},{17,27}},
+ {{21,21},{30,23}},{{21,24},{23,27}},{{28,24},{30,27}},{{21,28},{30,30}},{{24,24},{27,27}},
+ {{ 6, 6},{15, 8}},{{ 6, 9},{ 8,12}},{{13, 9},{15,12}},{{ 6,13},{15,15}},{{ 9, 9},{12,12}},
+ {{16, 6},{25, 8}},{{16, 9},{18,12}},{{23, 9},{25,12}},{{16,13},{25,15}},{{19, 9},{22,12}},
+ {{ 6,16},{15,18}},{{ 6,19},{ 8,22}},{{13,19},{15,22}},{{ 6,23},{15,25}},{{ 9,19},{12,22}},
+ {{16,16},{25,18}},{{16,19},{18,22}},{{23,19},{25,22}},{{16,23},{25,25}},{{19,19},{22,22}},
+ {{ 6, 1},{15, 3}},{{ 6, 4},{ 8, 7}},{{13, 4},{15, 7}},{{ 6, 8},{15,10}},{{ 9, 4},{12, 7}},
+ {{16, 1},{25, 3}},{{16, 4},{18, 7}},{{23, 4},{25, 7}},{{16, 8},{25,10}},{{19, 4},{22, 7}},
+ {{ 1, 6},{10, 8}},{{ 1, 9},{ 3,12}},{{ 8, 9},{10,12}},{{ 1,13},{10,15}},{{ 4, 9},{ 7,12}},
+ {{11, 6},{20, 8}},{{11, 9},{13,12}},{{18, 9},{20,12}},{{11,13},{20,15}},{{14, 9},{17,12}},
+ {{21, 6},{30, 8}},{{21, 9},{23,12}},{{28, 9},{30,12}},{{21,13},{30,15}},{{24, 9},{27,12}},
+ {{ 6,11},{15,13}},{{ 6,14},{ 8,17}},{{13,14},{15,17}},{{ 6,18},{15,20}},{{ 9,14},{12,17}},
+ {{16,11},{25,13}},{{16,14},{18,17}},{{23,14},{25,17}},{{16,18},{25,20}},{{19,14},{22,17}},
+ {{ 1,16},{10,18}},{{ 1,19},{ 3,22}},{{ 8,19},{10,22}},{{ 1,23},{10,25}},{{ 4,19},{ 7,22}},
+ {{11,16},{20,18}},{{11,19},{13,22}},{{18,19},{20,22}},{{11,23},{20,25}},{{14,19},{17,22}},
+ {{21,16},{30,18}},{{21,19},{23,22}},{{28,19},{30,22}},{{21,23},{30,25}},{{24,19},{27,22}},
+ {{ 6,21},{15,23}},{{ 6,24},{ 8,27}},{{13,24},{15,27}},{{ 6,28},{15,30}},{{ 9,24},{12,27}},
+ {{16,21},{25,23}},{{16,24},{18,27}},{{23,24},{25,27}},{{16,28},{25,30}},{{19,24},{22,27}},
+ {{ 2, 2},{14, 6}},{{ 2, 7},{ 6, 9}},{{10, 7},{14, 9}},{{ 2,10},{14,14}},{{ 7, 7},{ 9, 9}},
+ {{ 7, 2},{19, 6}},{{ 7, 7},{11, 9}},{{15, 7},{19, 9}},{{ 7,10},{19,14}},{{12, 7},{14, 9}},
+ {{12, 2},{24, 6}},{{12, 7},{16, 9}},{{20, 7},{24, 9}},{{12,10},{24,14}},{{17, 7},{19, 9}},
+ {{17, 2},{29, 6}},{{17, 7},{21, 9}},{{25, 7},{29, 9}},{{17,10},{29,14}},{{22, 7},{24, 9}},
+ {{ 2, 7},{14,11}},{{ 2,12},{ 6,14}},{{10,12},{14,14}},{{ 2,15},{14,19}},{{ 7,12},{ 9,14}},
+ {{ 7, 7},{19,11}},{{ 7,12},{11,14}},{{15,12},{19,14}},{{ 7,15},{19,19}},{{12,12},{14,14}},
+ {{12, 7},{24,11}},{{12,12},{16,14}},{{20,12},{24,14}},{{12,15},{24,19}},{{17,12},{19,14}},
+ {{17, 7},{29,11}},{{17,12},{21,14}},{{25,12},{29,14}},{{17,15},{29,19}},{{22,12},{24,14}},
+ {{ 2,12},{14,16}},{{ 2,17},{ 6,19}},{{10,17},{14,19}},{{ 2,20},{14,24}},{{ 7,17},{ 9,19}},
+ {{ 7,12},{19,16}},{{ 7,17},{11,19}},{{15,17},{19,19}},{{ 7,20},{19,24}},{{12,17},{14,19}},
+ {{12,12},{24,16}},{{12,17},{16,19}},{{20,17},{24,19}},{{12,20},{24,24}},{{17,17},{19,19}},
+ {{17,12},{29,16}},{{17,17},{21,19}},{{25,17},{29,19}},{{17,20},{29,24}},{{22,17},{24,19}},
+ {{ 2,17},{14,21}},{{ 2,22},{ 6,24}},{{10,22},{14,24}},{{ 2,25},{14,29}},{{ 7,22},{ 9,24}},
+ {{ 7,17},{19,21}},{{ 7,22},{11,24}},{{15,22},{19,24}},{{ 7,25},{19,29}},{{12,22},{14,24}},
+ {{12,17},{24,21}},{{12,22},{16,24}},{{20,22},{24,24}},{{12,25},{24,29}},{{17,22},{19,24}},
+ {{17,17},{29,21}},{{17,22},{21,24}},{{25,22},{29,24}},{{17,25},{29,29}},{{22,22},{24,24}},
+ {{ 8, 3},{13, 4}},{{ 8, 5},{ 9, 6}},{{12, 5},{13, 6}},{{ 8, 7},{13, 8}},{{10, 5},{11, 6}},
+ {{13, 3},{18, 4}},{{13, 5},{14, 6}},{{17, 5},{18, 6}},{{13, 7},{18, 8}},{{15, 5},{16, 6}},
+ {{18, 3},{23, 4}},{{18, 5},{19, 6}},{{22, 5},{23, 6}},{{18, 7},{23, 8}},{{20, 5},{21, 6}},
+ {{ 3, 8},{ 8, 9}},{{ 3,10},{ 4,11}},{{ 7,10},{ 8,11}},{{ 3,12},{ 8,13}},{{ 5,10},{ 6,11}},
+ {{ 8, 8},{13, 9}},{{ 8,10},{ 9,11}},{{12,10},{13,11}},{{ 8,12},{13,13}},{{10,10},{11,11}},
+ {{13, 8},{18, 9}},{{13,10},{14,11}},{{17,10},{18,11}},{{13,12},{18,13}},{{15,10},{16,11}},
+ {{18, 8},{23, 9}},{{18,10},{19,11}},{{22,10},{23,11}},{{18,12},{23,13}},{{20,10},{21,11}},
+ {{23, 8},{28, 9}},{{23,10},{24,11}},{{27,10},{28,11}},{{23,12},{28,13}},{{25,10},{26,11}},
+ {{ 3,13},{ 8,14}},{{ 3,15},{ 4,16}},{{ 7,15},{ 8,16}},{{ 3,17},{ 8,18}},{{ 5,15},{ 6,16}},
+ {{ 8,13},{13,14}},{{ 8,15},{ 9,16}},{{12,15},{13,16}},{{ 8,17},{13,18}},{{10,15},{11,16}},
+ {{13,13},{18,14}},{{13,15},{14,16}},{{17,15},{18,16}},{{13,17},{18,18}},{{15,15},{16,16}},
+ {{18,13},{23,14}},{{18,15},{19,16}},{{22,15},{23,16}},{{18,17},{23,18}},{{20,15},{21,16}},
+ {{23,13},{28,14}},{{23,15},{24,16}},{{27,15},{28,16}},{{23,17},{28,18}},{{25,15},{26,16}},
+ {{ 3,18},{ 8,19}},{{ 3,20},{ 4,21}},{{ 7,20},{ 8,21}},{{ 3,22},{ 8,23}},{{ 5,20},{ 6,21}},
+ {{ 8,18},{13,19}},{{ 8,20},{ 9,21}},{{12,20},{13,21}},{{ 8,22},{13,23}},{{10,20},{11,21}},
+ {{13,18},{18,19}},{{13,20},{14,21}},{{17,20},{18,21}},{{13,22},{18,23}},{{15,20},{16,21}},
+ {{18,18},{23,19}},{{18,20},{19,21}},{{22,20},{23,21}},{{18,22},{23,23}},{{20,20},{21,21}},
+ {{23,18},{28,19}},{{23,20},{24,21}},{{27,20},{28,21}},{{23,22},{28,23}},{{25,20},{26,21}},
+ {{ 8,23},{13,24}},{{ 8,25},{ 9,26}},{{12,25},{13,26}},{{ 8,27},{13,28}},{{10,25},{11,26}},
+ {{13,23},{18,24}},{{13,25},{14,26}},{{17,25},{18,26}},{{13,27},{18,28}},{{15,25},{16,26}},
+ {{18,23},{23,24}},{{18,25},{19,26}},{{22,25},{23,26}},{{18,27},{23,28}},{{20,25},{21,26}}
+};
+static const ElemCat elem_d5 = { 0, 4, 5, 62, elem_d5_data };
+
+static const Block elem_d6_data[] = {
+ {{ 3, 5},{12,10}},{{ 5, 3},{10,12}},
+ {{11, 5},{20,10}},{{13, 3},{18,12}},
+ {{19, 5},{28,10}},{{21, 3},{26,12}},
+ {{ 3,13},{12,18}},{{ 5,11},{10,20}},
+ {{11,13},{20,18}},{{13,11},{18,20}},
+ {{19,13},{28,18}},{{21,11},{26,20}},
+ {{ 3,21},{12,26}},{{ 5,19},{10,28}},
+ {{11,21},{20,26}},{{13,19},{18,28}},
+ {{19,21},{28,26}},{{21,19},{26,28}}
+};
+static const ElemCat elem_d6 = { 0, 1, 2, 9, elem_d6_data };
+
+static const Block elem_d7_data[] = {
+ {{ 0, 4},{ 3, 7}},{{ 8, 4},{11, 7}},{{ 4, 4},{ 7, 7}},
+ {{ 4, 0},{ 7, 3}},{{ 4, 8},{ 7,11}},{{ 4, 4},{ 7, 7}},
+ {{ 5, 4},{ 8, 7}},{{13, 4},{16, 7}},{{ 9, 4},{12, 7}},
+ {{ 9, 0},{12, 3}},{{ 9, 8},{12,11}},{{ 9, 4},{12, 7}},
+ {{10, 4},{13, 7}},{{18, 4},{21, 7}},{{14, 4},{17, 7}},
+ {{14, 0},{17, 3}},{{14, 8},{17,11}},{{14, 4},{17, 7}},
+ {{15, 4},{18, 7}},{{23, 4},{26, 7}},{{19, 4},{22, 7}},
+ {{19, 0},{22, 3}},{{19, 8},{22,11}},{{19, 4},{22, 7}},
+ {{20, 4},{23, 7}},{{28, 4},{31, 7}},{{24, 4},{27, 7}},
+ {{24, 0},{27, 3}},{{24, 8},{27,11}},{{24, 4},{27, 7}},
+ {{ 0, 9},{ 3,12}},{{ 8, 9},{11,12}},{{ 4, 9},{ 7,12}},
+ {{ 4, 5},{ 7, 8}},{{ 4,13},{ 7,16}},{{ 4, 9},{ 7,12}},
+ {{ 5, 9},{ 8,12}},{{13, 9},{16,12}},{{ 9, 9},{12,12}},
+ {{ 9, 5},{12, 8}},{{ 9,13},{12,16}},{{ 9, 9},{12,12}},
+ {{10, 9},{13,12}},{{18, 9},{21,12}},{{14, 9},{17,12}},
+ {{14, 5},{17, 8}},{{14,13},{17,16}},{{14, 9},{17,12}},
+ {{15, 9},{18,12}},{{23, 9},{26,12}},{{19, 9},{22,12}},
+ {{19, 5},{22, 8}},{{19,13},{22,16}},{{19, 9},{22,12}},
+ {{20, 9},{23,12}},{{28, 9},{31,12}},{{24, 9},{27,12}},
+ {{24, 5},{27, 8}},{{24,13},{27,16}},{{24, 9},{27,12}},
+ {{ 0,14},{ 3,17}},{{ 8,14},{11,17}},{{ 4,14},{ 7,17}},
+ {{ 4,10},{ 7,13}},{{ 4,18},{ 7,21}},{{ 4,14},{ 7,17}},
+ {{ 5,14},{ 8,17}},{{13,14},{16,17}},{{ 9,14},{12,17}},
+ {{ 9,10},{12,13}},{{ 9,18},{12,21}},{{ 9,14},{12,17}},
+ {{10,14},{13,17}},{{18,14},{21,17}},{{14,14},{17,17}},
+ {{14,10},{17,13}},{{14,18},{17,21}},{{14,14},{17,17}},
+ {{15,14},{18,17}},{{23,14},{26,17}},{{19,14},{22,17}},
+ {{19,10},{22,13}},{{19,18},{22,21}},{{19,14},{22,17}},
+ {{20,14},{23,17}},{{28,14},{31,17}},{{24,14},{27,17}},
+ {{24,10},{27,13}},{{24,18},{27,21}},{{24,14},{27,17}},
+ {{ 0,19},{ 3,22}},{{ 8,19},{11,22}},{{ 4,19},{ 7,22}},
+ {{ 4,15},{ 7,18}},{{ 4,23},{ 7,26}},{{ 4,19},{ 7,22}},
+ {{ 5,19},{ 8,22}},{{13,19},{16,22}},{{ 9,19},{12,22}},
+ {{ 9,15},{12,18}},{{ 9,23},{12,26}},{{ 9,19},{12,22}},
+ {{10,19},{13,22}},{{18,19},{21,22}},{{14,19},{17,22}},
+ {{14,15},{17,18}},{{14,23},{17,26}},{{14,19},{17,22}},
+ {{15,19},{18,22}},{{23,19},{26,22}},{{19,19},{22,22}},
+ {{19,15},{22,18}},{{19,23},{22,26}},{{19,19},{22,22}},
+ {{20,19},{23,22}},{{28,19},{31,22}},{{24,19},{27,22}},
+ {{24,15},{27,18}},{{24,23},{27,26}},{{24,19},{27,22}},
+ {{ 0,24},{ 3,27}},{{ 8,24},{11,27}},{{ 4,24},{ 7,27}},
+ {{ 4,20},{ 7,23}},{{ 4,28},{ 7,31}},{{ 4,24},{ 7,27}},
+ {{ 5,24},{ 8,27}},{{13,24},{16,27}},{{ 9,24},{12,27}},
+ {{ 9,20},{12,23}},{{ 9,28},{12,31}},{{ 9,24},{12,27}},
+ {{10,24},{13,27}},{{18,24},{21,27}},{{14,24},{17,27}},
+ {{14,20},{17,23}},{{14,28},{17,31}},{{14,24},{17,27}},
+ {{15,24},{18,27}},{{23,24},{26,27}},{{19,24},{22,27}},
+ {{19,20},{22,23}},{{19,28},{22,31}},{{19,24},{22,27}},
+ {{20,24},{23,27}},{{28,24},{31,27}},{{24,24},{27,27}},
+ {{24,20},{27,23}},{{24,28},{27,31}},{{24,24},{27,27}}
+};
+static const ElemCat elem_d7 = { 0, 2, 3, 50, elem_d7_data };
+
+static const Block elem_d8_data[] = {
+ {{ 0, 0},{ 7, 3}},{{ 0, 4},{ 7, 7}},
+ {{ 8, 0},{11, 7}},{{12, 0},{15, 7}},
+ {{ 0, 8},{ 3,15}},{{ 4, 8},{ 7,15}},
+ {{ 8, 8},{15,11}},{{ 8,12},{15,15}},
+ {{16, 0},{19, 7}},{{20, 0},{23, 7}},
+ {{24, 0},{31, 3}},{{24, 4},{31, 7}},
+ {{16, 8},{23,11}},{{16,12},{23,15}},
+ {{24, 8},{27,15}},{{28, 8},{31,15}},
+ {{ 0,16},{ 3,23}},{{ 4,16},{ 7,23}},
+ {{ 8,16},{15,19}},{{ 8,20},{15,23}},
+ {{ 0,24},{ 7,27}},{{ 0,28},{ 7,31}},
+ {{ 8,24},{11,31}},{{12,24},{15,31}},
+ {{16,16},{23,19}},{{16,20},{23,23}},
+ {{24,16},{27,23}},{{28,16},{31,23}},
+ {{16,24},{19,31}},{{20,24},{23,31}},
+ {{24,24},{31,27}},{{24,28},{31,31}},
+ {{ 0, 0},{ 7,15}},{{ 8, 0},{15,15}},
+ {{16, 0},{31, 7}},{{16, 8},{31,15}},
+ {{ 0,16},{15,23}},{{ 0,24},{15,31}},
+ {{16,16},{23,31}},{{24,16},{31,31}}
+};
+static const ElemCat elem_d8 = { 0, 1, 2, 20, elem_d8_data };
+
+static const ElemCat* elements[ELEMENT_COUNT] = { &elem_a1, &elem_a2,
+ &elem_d1, &elem_d2, &elem_d3, &elem_d4,
+ &elem_d5, &elem_d6, &elem_d7, &elem_d8 };
+#endif /* AVFILTER_SIGNATURE_H */
diff --git a/libavfilter/signature_lookup.c b/libavfilter/signature_lookup.c
new file mode 100644
index 0000000..5bc2904
--- /dev/null
+++ b/libavfilter/signature_lookup.c
@@ -0,0 +1,573 @@
+/*
+ * Copyright (c) 2017 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.
+ */
+
+/**
+ * @file
+ * MPEG-7 video signature calculation and lookup filter
+ */
+
+#include "signature.h"
+
+#define HOUGH_MAX_OFFSET 90
+#define MAX_FRAMERATE 60
+
+#define DIR_PREV 0
+#define DIR_NEXT 1
+#define DIR_PREV_END 2
+#define DIR_NEXT_END 3
+
+#define STATUS_NULL 0
+#define STATUS_END_REACHED 1
+#define STATUS_BEGIN_REACHED 2
+
+static void fill_l1distlut(uint8_t lut[])
+{
+ int i, j, tmp_i, tmp_j,count;
+ uint8_t dist;
+
+ for (i = 0, count = 0; i < 242; i++) {
+ for (j = i + 1; j < 243; j++, count++) {
+ /* ternary distance between i and j */
+ dist = 0;
+ tmp_i = i; tmp_j = j;
+ do {
+ dist += FFABS((tmp_j % 3) - (tmp_i % 3));
+ tmp_j /= 3;
+ tmp_i /= 3;
+ } while (tmp_i > 0 || tmp_j > 0);
+ lut[count] = dist;
+ }
+ }
+}
+
+static unsigned int intersection_word(const uint8_t *first, const uint8_t *second)
+{
+ unsigned int val=0,i;
+ for (i = 0; i < 28; i += 4) {
+ val += av_popcount( (first[i] & second[i] ) << 24 |
+ (first[i+1] & second[i+1]) << 16 |
+ (first[i+2] & second[i+2]) << 8 |
+ (first[i+3] & second[i+3]) );
+ }
+ val += av_popcount( (first[28] & second[28]) << 16 |
+ (first[29] & second[29]) << 8 |
+ (first[30] & second[30]) );
+ return val;
+}
+
+static unsigned int union_word(const uint8_t *first, const uint8_t *second)
+{
+ unsigned int val=0,i;
+ for (i = 0; i < 28; i += 4) {
+ val += av_popcount( (first[i] | second[i] ) << 24 |
+ (first[i+1] | second[i+1]) << 16 |
+ (first[i+2] | second[i+2]) << 8 |
+ (first[i+3] | second[i+3]) );
+ }
+ val += av_popcount( (first[28] | second[28]) << 16 |
+ (first[29] | second[29]) << 8 |
+ (first[30] | second[30]) );
+ return val;
+}
+
+static unsigned int get_l1dist(AVFilterContext *ctx, SignatureContext *sc, const uint8_t *first, const uint8_t *second)
+{
+ unsigned int i;
+ unsigned int dist = 0;
+ uint8_t f, s;
+
+ for (i = 0; i < SIGELEM_SIZE/5; i++) {
+ if (first[i] != second[i]) {
+ f = first[i];
+ s = second[i];
+ if (f > s) {
+ /* little variation of gauss sum formula */
+ dist += sc->l1distlut[243*242/2 - (243-s)*(242-s)/2 + f - s - 1];
+ } else {
+ dist += sc->l1distlut[243*242/2 - (243-f)*(242-f)/2 + s - f - 1];
+ }
+ }
+ }
+ return dist;
+}
+
+/**
+ * calculates the jaccard distance and evaluates a pair of coarse signatures as good
+ * @return 0 if pair is bad, 1 otherwise
+ */
+static int get_jaccarddist(SignatureContext *sc, CoarseSignature *first, CoarseSignature *second)
+{
+ int jaccarddist, i, composdist = 0, cwthcount = 0;
+ for (i = 0; i < 5; i++) {
+ if ((jaccarddist = intersection_word(first->data[i], second->data[i])) > 0) {
+ jaccarddist /= union_word(first->data[i], second->data[i]);
+ }
+ if (jaccarddist >= sc->thworddist) {
+ if (++cwthcount > 2) {
+ /* more than half (5/2) of distances are too wide */
+ return 0;
+ }
+ }
+ composdist += jaccarddist;
+ if (composdist > sc->thcomposdist) {
+ return 0;
+ }
+ }
+ return 1;
+}
+
+/**
+ * step through the coarsesignatures as long as a good candidate is found
+ * @return 0 if no candidate is found, 1 otherwise
+ */
+static int find_next_coarsecandidate(SignatureContext *sc, CoarseSignature *secondstart, CoarseSignature **first, CoarseSignature **second, int start)
+{
+ /* go one coarsesignature foreword */
+ if (!start) {
+ if ((*second)->next) {
+ *second = (*second)->next;
+ } else if ((*first)->next) {
+ *second = secondstart;
+ *first = (*first)->next;
+ } else {
+ return 0;
+ }
+ }
+
+ while (1) {
+ if (get_jaccarddist(sc, *first, *second))
+ return 1;
+
+ /* next signature */
+ if ((*second)->next) {
+ *second = (*second)->next;
+ } else if ((*first)->next) {
+ *second = secondstart;
+ *first = (*first)->next;
+ } else {
+ return 0;
+ }
+ }
+}
+
+/**
+ * compares framesignatures and sorts out signatures with a l1 distance above a given threshold.
+ * Then tries to find out offset and differences between framerates with a hough transformation
+ */
+static MatchingInfo* get_matching_parameters(AVFilterContext *ctx, SignatureContext *sc, FineSignature *first, FineSignature *second)
+{
+ FineSignature *f, *s;
+ size_t i, j, k, l, hmax = 0, score;
+ int framerate, offset, l1dist;
+ double m;
+ MatchingInfo *cands = NULL, *c = NULL;
+
+ struct {
+ uint8_t size;
+ unsigned int dist;
+ FineSignature *a;
+ uint8_t b_pos[COARSE_SIZE];
+ FineSignature *b[COARSE_SIZE];
+ } pairs[COARSE_SIZE];
+
+ typedef struct {
+ int dist;
+ size_t score;
+ FineSignature *a;
+ FineSignature *b;
+ } hspace_elem;
+
+ /* houghspace */
+ hspace_elem** hspace = av_malloc_array(MAX_FRAMERATE, sizeof(hspace_elem *));
+
+ /* initialize houghspace */
+ for (i = 0; i < MAX_FRAMERATE; i++) {
+ hspace[i] = av_malloc_array(2 * HOUGH_MAX_OFFSET + 1, sizeof(hspace_elem));
+ for (j = 0; j < HOUGH_MAX_OFFSET; j++) {
+ hspace[i][j].score = 0;
+ hspace[i][j].dist = 99999;
+ }
+ }
+
+ /* l1 distances */
+ for (i = 0, f = first; i < COARSE_SIZE && f->next; i++, f = f->next) {
+ pairs[i].size = 0;
+ pairs[i].dist = 99999;
+ pairs[i].a = f;
+ for (j = 0, s = second; j < COARSE_SIZE && s->next; j++, s = s->next) {
+ /* l1 distance of finesignature */
+ l1dist = get_l1dist(ctx, sc, f->framesig, s->framesig);
+ if (l1dist < sc->thl1) {
+ if (l1dist < pairs[i].dist) {
+ pairs[i].size = 1;
+ pairs[i].dist = l1dist;
+ pairs[i].b_pos[0] = j;
+ pairs[i].b[0] = s;
+ } else if (l1dist == pairs[i].dist) {
+ pairs[i].b[pairs[i].size] = s;
+ pairs[i].b_pos[pairs[i].size] = j;
+ pairs[i].size++;
+ }
+ }
+ }
+ }
+ /* last incomplete coarsesignature */
+ if (f->next == NULL) {
+ for (; i < COARSE_SIZE; i++) {
+ pairs[i].size = 0;
+ pairs[i].dist = 99999;
+ }
+ }
+
+ /* hough transformation */
+ for (i = 0; i < COARSE_SIZE; i++) {
+ for (j = 0; j < pairs[i].size; j++) {
+ for (k = i + 1; k < COARSE_SIZE; k++) {
+ for (l = 0; l < pairs[k].size; l++) {
+ if (pairs[i].b[j] != pairs[k].b[l]) {
+ /* linear regression */
+ m = (pairs[k].b_pos[l]-pairs[i].b_pos[j]) / (k-i); /* good value between 0.0 - 2.0 */
+ framerate = (int) m*30 + 0.5; /* round up to 0 - 60 */
+ if (framerate>0 && framerate <= MAX_FRAMERATE) {
+ offset = pairs[i].b_pos[j] - ((int) m*i + 0.5); /* only second part has to be rounded up */
+ if (offset > -HOUGH_MAX_OFFSET && offset < HOUGH_MAX_OFFSET) {
+ if (pairs[i].dist < pairs[k].dist) {
+ if (pairs[i].dist < hspace[framerate-1][offset+HOUGH_MAX_OFFSET].dist) {
+ hspace[framerate-1][offset+HOUGH_MAX_OFFSET].dist = pairs[i].dist;
+ hspace[framerate-1][offset+HOUGH_MAX_OFFSET].a = pairs[i].a;
+ hspace[framerate-1][offset+HOUGH_MAX_OFFSET].b = pairs[i].b[j];
+ }
+ } else {
+ if (pairs[k].dist < hspace[framerate-1][offset+HOUGH_MAX_OFFSET].dist) {
+ hspace[framerate-1][offset+HOUGH_MAX_OFFSET].dist = pairs[k].dist;
+ hspace[framerate-1][offset+HOUGH_MAX_OFFSET].a = pairs[k].a;
+ hspace[framerate-1][offset+HOUGH_MAX_OFFSET].b = pairs[k].b[l];
+ }
+ }
+
+ score = hspace[framerate-1][offset+HOUGH_MAX_OFFSET].score + 1;
+ if (score > hmax )
+ hmax = score;
+ hspace[framerate-1][offset+HOUGH_MAX_OFFSET].score = score;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ if (hmax > 0) {
+ hmax = (int) (0.7*hmax);
+ for (i = 0; i < MAX_FRAMERATE; i++) {
+ for (j = 0; j < HOUGH_MAX_OFFSET; j++) {
+ if (hmax < hspace[i][j].score) {
+ if (c == NULL) {
+ c = av_malloc(sizeof(MatchingInfo));
+ if (!c)
+ av_log(ctx, AV_LOG_FATAL, "Could not allocate memory");
+ cands = c;
+ } else {
+ c->next = av_malloc(sizeof(MatchingInfo));
+ if (!c->next)
+ av_log(ctx, AV_LOG_FATAL, "Could not allocate memory");
+ c = c->next;
+ }
+ c->framerateratio = (i+1.0) / 30;
+ c->score = hspace[i][j].score;
+ c->offset = j-90;
+ c->first = hspace[i][j].a;
+ c->second = hspace[i][j].b;
+ c->next = NULL;
+
+ /* not used */
+ c->meandist = 0;
+ c->matchframes = 0;
+ c->whole = 0;
+ }
+ }
+ }
+ }
+ for (i = 0; i < MAX_FRAMERATE; i++) {
+ av_freep(&hspace[i]);
+ }
+ av_freep(&hspace);
+ return cands;
+}
+
+static int iterate_frame(double frr, FineSignature **a, FineSignature **b, int fcount, int *bcount, int dir)
+{
+ int step;
+
+ /* between 1 and 2, because frr is between 1 and 2 */
+ step = ((int) 0.5 + fcount * frr) /* current frame */
+ -((int) 0.5 + (fcount-1) * frr);/* last frame */
+
+ if (dir == DIR_NEXT) {
+ if (frr >= 1.0) {
+ if ((*a)->next) {
+ *a = (*a)->next;
+ } else {
+ return DIR_NEXT_END;
+ }
+
+ if (step == 1) {
+ if ((*b)->next) {
+ *b = (*b)->next;
+ (*bcount)++;
+ } else {
+ return DIR_NEXT_END;
+ }
+ } else {
+ if ((*b)->next && (*b)->next->next) {
+ *b = (*b)->next->next;
+ (*bcount)++;
+ } else {
+ return DIR_NEXT_END;
+ }
+ }
+ } else {
+ if ((*b)->next) {
+ *b = (*b)->next;
+ (*bcount)++;
+ } else {
+ return DIR_NEXT_END;
+ }
+
+ if (step == 1) {
+ if ((*a)->next) {
+ *a = (*a)->next;
+ } else {
+ return DIR_NEXT_END;
+ }
+ } else {
+ if ((*a)->next && (*a)->next->next) {
+ *a = (*a)->next->next;
+ } else {
+ return DIR_NEXT_END;
+ }
+ }
+ }
+ return DIR_NEXT;
+ } else {
+ if (frr >= 1.0) {
+ if ((*a)->prev) {
+ *a = (*a)->prev;
+ } else {
+ return DIR_PREV_END;
+ }
+
+ if (step == 1) {
+ if ((*b)->prev) {
+ *b = (*b)->prev;
+ (*bcount)++;
+ } else {
+ return DIR_PREV_END;
+ }
+ } else {
+ if ((*b)->prev && (*b)->prev->prev) {
+ *b = (*b)->prev->prev;
+ (*bcount)++;
+ } else {
+ return DIR_PREV_END;
+ }
+ }
+ } else {
+ if ((*b)->prev) {
+ *b = (*b)->prev;
+ (*bcount)++;
+ } else {
+ return DIR_PREV_END;
+ }
+
+ if (step == 1) {
+ if ((*a)->prev) {
+ *a = (*a)->prev;
+ } else {
+ return DIR_PREV_END;
+ }
+ } else {
+ if ((*a)->prev && (*a)->prev->prev) {
+ *a = (*a)->prev->prev;
+ } else {
+ return DIR_PREV_END;
+ }
+ }
+ }
+ return DIR_PREV;
+ }
+}
+
+static MatchingInfo evaluate_parameters(AVFilterContext *ctx, SignatureContext *sc, MatchingInfo *infos, MatchingInfo bestmatch, int mode)
+{
+ int dist, distsum = 0, bcount = 1, dir = DIR_NEXT;
+ int fcount = 0, goodfcount = 0, gooda = 0, goodb = 0;
+ double meandist, minmeandist = bestmatch.meandist;
+ int tolerancecount = 0;
+ FineSignature *a, *b, *aprev, *bprev;
+ int status = STATUS_NULL;
+
+ for (; infos != NULL; infos = infos->next) {
+ a = infos->first;
+ b = infos->second;
+ while (1) {
+ dist = get_l1dist(ctx, sc, a->framesig, b->framesig);
+
+ if (dist > sc->thl1) {
+ if (a->confidence >= 1 || b->confidence >= 1) {
+ /* bad frame (because high different information) */
+ tolerancecount++;
+ }
+
+ if (tolerancecount > 2) {
+ a = aprev;
+ b = bprev;
+ if (dir == DIR_NEXT) {
+ /* turn around */
+ a = infos->first;
+ b = infos->second;
+ dir = DIR_PREV;
+ } else {
+ break;
+ }
+ }
+ } else {
+ /* good frame */
+ distsum += dist;
+ goodfcount++;
+ tolerancecount=0;
+
+ aprev = a;
+ bprev = b;
+
+ if (a->confidence < 1) gooda++;
+ if (b->confidence < 1) goodb++;
+ }
+
+ fcount++;
+
+ dir = iterate_frame(infos->framerateratio, &a, &b, fcount, &bcount, dir);
+ if (dir == DIR_NEXT_END) {
+ status = STATUS_END_REACHED;
+ a = infos->first;
+ b = infos->second;
+ dir = iterate_frame(infos->framerateratio, &a, &b, fcount, &bcount, DIR_PREV);
+ }
+
+ if (dir == DIR_PREV_END) {
+ status |= STATUS_BEGIN_REACHED;
+ break;
+ }
+
+ if (sc->thdi != 0 && bcount >= sc->thdi) {
+ break; /* enough frames found */
+ }
+ }
+
+ if (bcount < sc->thdi)
+ continue; /* matching sequence is too short */
+ if ((double) goodfcount / (double) fcount < sc->thit)
+ continue;
+ if ((double) goodfcount*0.5 < FFMAX(gooda, goodb))
+ continue;
+
+ meandist = (double) goodfcount / (double) distsum;
+
+ if (meandist < minmeandist ||
+ status == STATUS_END_REACHED | STATUS_BEGIN_REACHED ||
+ mode == MODE_FAST){
+ minmeandist = meandist;
+ /* bestcandidate in this iteration */
+ bestmatch.meandist = meandist;
+ bestmatch.matchframes = bcount;
+ bestmatch.framerateratio = infos->framerateratio;
+ bestmatch.score = infos->score;
+ bestmatch.offset = infos->offset;
+ bestmatch.first = infos->first;
+ bestmatch.second = infos->second;
+ bestmatch.whole = 0; /* will be set to true later */
+ bestmatch.next = NULL;
+ }
+
+ /* whole sequence is automatically best match */
+ if (status == (STATUS_END_REACHED | STATUS_BEGIN_REACHED)) {
+ bestmatch.whole = 1;
+ break;
+ }
+
+ /* first matching sequence is enough, finding the best one is not necessary */
+ if (mode == MODE_FAST) {
+ break;
+ }
+ }
+ return bestmatch;
+}
+
+static void sll_free(MatchingInfo *sll)
+{
+ void *tmp;
+ while (sll) {
+ tmp = sll;
+ sll = sll->next;
+ av_freep(&tmp);
+ }
+}
+
+static MatchingInfo lookup_signatures(AVFilterContext *ctx, SignatureContext *sc, StreamContext *first, StreamContext *second, int mode)
+{
+ CoarseSignature *cs, *cs2;
+ MatchingInfo *infos;
+ MatchingInfo bestmatch;
+ MatchingInfo *i;
+
+ cs = first->coarsesiglist;
+ cs2 = second->coarsesiglist;
+
+ /* score of bestmatch is 0, if no match is found */
+ bestmatch.score = 0;
+ bestmatch.meandist = 99999;
+ bestmatch.whole = 0;
+
+ fill_l1distlut(sc->l1distlut);
+
+ /* stage 1: coarsesignature matching */
+ if (find_next_coarsecandidate(sc, second->coarsesiglist, &cs, &cs2, 1) == 0)
+ return bestmatch; /* no candidate found */
+ do {
+ av_log(ctx, AV_LOG_DEBUG, "Stage 1: got coarsesignature pair. indices of first frame: %d and %d\n", cs->first->index, cs2->first->index);
+ /* stage 2: l1-distance and hough-transform */
+ av_log(ctx, AV_LOG_DEBUG, "Stage 2: calculate matching parameters\n");
+ infos = get_matching_parameters(ctx, sc, cs->first, cs2->first);
+ if (av_log_get_level() == AV_LOG_DEBUG) {
+ for (i = infos; i != NULL; i = i->next) {
+ av_log(ctx, AV_LOG_DEBUG, "Stage 2: matching pair at %d and %d, ratio %f, offset %d\n", i->first->index, i->second->index, i->framerateratio, i->offset);
+ }
+ }
+ /* stage 3: evaluation */
+ av_log(ctx, AV_LOG_DEBUG, "Stage 3: evaluate\n");
+ if (infos) {
+ bestmatch = evaluate_parameters(ctx, sc, infos, bestmatch, mode);
+ av_log(ctx, AV_LOG_DEBUG, "Stage 3: best matching pair at %d and %d, ratio %f, offset %d, score %d, %d frames matching\n", bestmatch.first->index, bestmatch.second->index, bestmatch.framerateratio, bestmatch.offset, bestmatch.score, bestmatch.matchframes);
+ sll_free(infos);
+ }
+ } while (find_next_coarsecandidate(sc, second->coarsesiglist, &cs, &cs2, 0) && !bestmatch.whole);
+ return bestmatch;
+
+}
diff --git a/libavfilter/version.h b/libavfilter/version.h
index c2684bf..a61ca32 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 6
-#define LIBAVFILTER_VERSION_MINOR 77
+#define LIBAVFILTER_VERSION_MINOR 78
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
diff --git a/libavfilter/vf_signature.c b/libavfilter/vf_signature.c
new file mode 100644
index 0000000..57cb96b
--- /dev/null
+++ b/libavfilter/vf_signature.c
@@ -0,0 +1,767 @@
+/*
+ * Copyright (c) 2017 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.
+ */
+
+/**
+ * @file
+ * MPEG-7 video signature calculation and lookup filter
+ * @see http://epubs.surrey.ac.uk/531590/1/MPEG-7%20Video%20Signature%20Author%27s%20Copy.pdf
+ */
+
+#include <float.h>
+#include "libavcodec/put_bits.h"
+#include "libavformat/avformat.h"
+#include "libavutil/opt.h"
+#include "libavutil/avstring.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/timestamp.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "signature.h"
+#include "signature_lookup.c"
+
+#define OFFSET(x) offsetof(SignatureContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
+#define BLOCK_LCM (int64_t) 476985600
+
+static const AVOption signature_options[] = {
+ { "detectmode", "set the detectmode",
+ OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_OFF}, 0, NB_LOOKUP_MODE-1, FLAGS, "mode" },
+ { "off", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = MODE_OFF}, 0, 0, .flags = FLAGS, "mode" },
+ { "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = MODE_FULL}, 0, 0, .flags = FLAGS, "mode" },
+ { "fast", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = MODE_FAST}, 0, 0, .flags = FLAGS, "mode" },
+ { "nb_inputs", "number of inputs",
+ OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, FLAGS },
+ { "filename", "filename for output files",
+ OFFSET(filename), AV_OPT_TYPE_STRING, {.str = ""}, 0, NB_FORMATS-1, FLAGS },
+ { "format", "set output format",
+ OFFSET(format), AV_OPT_TYPE_INT, {.i64 = FORMAT_BINARY}, 0, 1, FLAGS , "format" },
+ { "binary", 0, 0, AV_OPT_TYPE_CONST, {.i64=FORMAT_BINARY}, 0, 0, FLAGS, "format" },
+ { "xml", 0, 0, AV_OPT_TYPE_CONST, {.i64=FORMAT_XML}, 0, 0, FLAGS, "format" },
+ { "th_d", "threshold to detect one word as similar",
+ OFFSET(thworddist), AV_OPT_TYPE_INT, {.i64 = 9000}, 1, INT_MAX, FLAGS },
+ { "th_dc", "threshold to detect all words as similar",
+ OFFSET(thcomposdist), AV_OPT_TYPE_INT, {.i64 = 60000}, 1, INT_MAX, FLAGS },
+ { "th_xh", "threshold to detect frames as similar",
+ OFFSET(thl1), AV_OPT_TYPE_INT, {.i64 = 116}, 1, INT_MAX, FLAGS },
+ { "th_di", "minimum length of matching sequence in frames",
+ OFFSET(thdi), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
+ { "th_it", "threshold for relation of good to all frames",
+ OFFSET(thit), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0.0, 1.0, FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(signature);
+
+static int query_formats(AVFilterContext *ctx)
+{
+ /* all formats with a seperate gray value */
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_GRAY8,
+ AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
+ AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
+ AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
+ AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P,
+ AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
+ AV_PIX_FMT_YUVJ440P,
+ AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
+ AV_PIX_FMT_NONE
+ };
+
+ return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ SignatureContext *sic = ctx->priv;
+ StreamContext *sc = &(sic->streamcontexts[FF_INLINK_IDX(inlink)]);
+
+ sc->time_base = inlink->time_base;
+ /* test for overflow */
+ sc->divide = (((uint64_t) inlink->w/32) * (inlink->w/32 + 1) * (inlink->h/32 * inlink->h/32 + 1) > INT64_MAX / (BLOCK_LCM * 255));
+ if (sc->divide) {
+ av_log(ctx, AV_LOG_WARNING, "Input dimension too high for precise calculation, numbers will be rounded.\n");
+ }
+ sc->w = inlink->w;
+ sc->h = inlink->h;
+ return 0;
+}
+
+static int get_block_size(const Block *b)
+{
+ return (b->to.y - b->up.y + 1) * (b->to.x - b->up.x + 1);
+}
+
+static uint64_t get_block_sum(StreamContext *sc, uint64_t intpic[32][32], const Block *b)
+{
+ uint64_t sum = 0;
+
+ int x0, y0, x1, y1;
+
+ x0 = b->up.x;
+ y0 = b->up.y;
+ x1 = b->to.x;
+ y1 = b->to.y;
+
+ if (x0-1 >= 0 && y0-1 >= 0) {
+ sum = intpic[y1][x1] + intpic[y0-1][x0-1] - intpic[y1][x0-1] - intpic[y0-1][x1];
+ } else if (x0-1 >= 0) {
+ sum = intpic[y1][x1] - intpic[y1][x0-1];
+ } else if (y0-1 >= 0) {
+ sum = intpic[y1][x1] - intpic[y0-1][x1];
+ } else {
+ sum = intpic[y1][x1];
+ }
+ return sum;
+}
+
+static int cmp(const uint64_t *a, const uint64_t *b)
+{
+ return *a < *b ? -1 : ( *a > *b ? 1 : 0 );
+}
+
+/**
+ * sets the bit at position pos to 1 in data
+ */
+static void set_bit(uint8_t* data, size_t pos)
+{
+ uint8_t mask = 1 << 7-(pos%8);
+ data[pos/8] |= mask;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
+{
+ AVFilterContext *ctx = inlink->dst;
+ SignatureContext *sic = ctx->priv;
+ StreamContext *sc = &(sic->streamcontexts[FF_INLINK_IDX(inlink)]);
+ FineSignature* fs;
+
+ static const uint8_t pot3[5] = { 3*3*3*3, 3*3*3, 3*3, 3, 1 };
+ /* indexes of words : 210,217,219,274,334 44,175,233,270,273 57,70,103,237,269 100,285,295,337,354 101,102,111,275,296
+ s2usw = sorted to unsorted wordvec: 44 is at index 5, 57 at index 10...
+ */
+ static const unsigned int wordvec[25] = {44,57,70,100,101,102,103,111,175,210,217,219,233,237,269,270,273,274,275,285,295,296,334,337,354};
+ static const uint8_t s2usw[25] = { 5,10,11, 15, 20, 21, 12, 22, 6, 0, 1, 2, 7, 13, 14, 8, 9, 3, 23, 16, 17, 24, 4, 18, 19};
+
+ uint8_t wordt2b[5] = { 0, 0, 0, 0, 0 }; /* word ternary to binary */
+ uint64_t intpic[32][32];
+ uint64_t rowcount;
+ uint8_t *p = picref->data[0];
+ int inti, intj;
+ int *intjlut;
+
+ uint64_t conflist[DIFFELEM_SIZE];
+ int f = 0, g = 0, w = 0;
+ int32_t dh1 = 1, dh2 = 1, dw1 = 1, dw2 = 1, a, b;
+ int64_t denom;
+ int i, j, k, ternary;
+ uint64_t blocksum;
+ int blocksize;
+ int64_t th; /* threshold */
+ int64_t sum;
+
+ int64_t precfactor = (sc->divide) ? 65536 : BLOCK_LCM;
+
+ /* initialize fs */
+ if (sc->curfinesig) {
+ fs = av_mallocz(sizeof(FineSignature));
+ if (!fs)
+ return AVERROR(ENOMEM);
+ sc->curfinesig->next = fs;
+ fs->prev = sc->curfinesig;
+ sc->curfinesig = fs;
+ } else {
+ fs = sc->curfinesig = sc->finesiglist;
+ sc->curcoarsesig1->first = fs;
+ }
+
+ fs->pts = picref->pts;
+ fs->index = sc->lastindex++;
+
+ memset(intpic, 0, sizeof(uint64_t)*32*32);
+ intjlut = av_malloc_array(inlink->w, sizeof(int));
+ if (!intjlut)
+ return AVERROR(ENOMEM);
+ for (i = 0; i < inlink->w; i++) {
+ intjlut[i] = (i*32)/inlink->w;
+ }
+
+ for (i = 0; i < inlink->h; i++) {
+ inti = (i*32)/inlink->h;
+ for (j = 0; j < inlink->w; j++) {
+ intj = intjlut[j];
+ intpic[inti][intj] += p[j];
+ }
+ p += picref->linesize[0];
+ }
+ av_freep(&intjlut);
+
+ /* The following calculates a summed area table (intpic) and brings the numbers
+ * in intpic to the same denominator.
+ * So you only have to handle the numinator in the following sections.
+ */
+ dh1 = inlink->h / 32;
+ if (inlink->h % 32)
+ dh2 = dh1 + 1;
+ dw1 = inlink->w / 32;
+ if (inlink->w % 32)
+ dw2 = dw1 + 1;
+ denom = (sc->divide) ? dh1 * dh2 * dw1 * dw2 : 1;
+
+ for (i = 0; i < 32; i++) {
+ rowcount = 0;
+ a = 1;
+ if (dh2 > 1) {
+ a = ((inlink->h*(i+1))%32 == 0) ? (inlink->h*(i+1))/32 - 1 : (inlink->h*(i+1))/32;
+ a -= ((inlink->h*i)%32 == 0) ? (inlink->h*i)/32 - 1 : (inlink->h*i)/32;
+ a = (a == dh1)? dh2 : dh1;
+ }
+ for (j = 0; j < 32; j++) {
+ b = 1;
+ if (dw2 > 1) {
+ b = ((inlink->w*(j+1))%32 == 0) ? (inlink->w*(j+1))/32 - 1 : (inlink->w*(j+1))/32;
+ b -= ((inlink->w*j)%32 == 0) ? (inlink->w*j)/32 - 1 : (inlink->w*j)/32;
+ b = (b == dw1)? dw2 : dw1;
+ }
+ rowcount += intpic[i][j] * a * b * precfactor / denom;
+ if (i > 0) {
+ intpic[i][j] = intpic[i-1][j] + rowcount;
+ } else {
+ intpic[i][j] = rowcount;
+ }
+ }
+ }
+
+ denom = (sc->divide) ? 1 : dh1 * dh2 * dw1 * dw2;
+
+ for (i = 0; i < ELEMENT_COUNT; i++) {
+ const ElemCat* elemcat = elements[i];
+ int64_t* elemsignature;
+ uint64_t* sortsignature;
+
+ elemsignature = av_malloc_array(elemcat->elem_count, sizeof(int64_t));
+ if (!elemsignature)
+ return AVERROR(ENOMEM);
+ sortsignature = av_malloc_array(elemcat->elem_count, sizeof(int64_t));
+ if (!sortsignature)
+ return AVERROR(ENOMEM);
+
+ for (j = 0; j < elemcat->elem_count; j++) {
+ blocksum = 0;
+ blocksize = 0;
+ for (k = 0; k < elemcat->left_count; k++) {
+ blocksum += get_block_sum(sc, intpic, &elemcat->blocks[j*elemcat->block_count+k]);
+ blocksize += get_block_size(&elemcat->blocks[j*elemcat->block_count+k]);
+ }
+ sum = blocksum / blocksize;
+ if (elemcat->av_elem) {
+ sum -= 128 * precfactor * denom;
+ } else {
+ blocksum = 0;
+ blocksize = 0;
+ for (; k < elemcat->block_count; k++) {
+ blocksum += get_block_sum(sc, intpic, &elemcat->blocks[j*elemcat->block_count+k]);
+ blocksize += get_block_size(&elemcat->blocks[j*elemcat->block_count+k]);
+ }
+ sum -= blocksum / blocksize;
+ conflist[g++] = FFABS(sum * 8 / (precfactor * denom));
+ }
+
+ elemsignature[j] = sum;
+ sortsignature[j] = FFABS(sum);
+ }
+
+ /* get threshold */
+ qsort(sortsignature, elemcat->elem_count, sizeof(uint64_t), (void*) cmp);
+ th = sortsignature[(int) (elemcat->elem_count*0.333)];
+
+ /* ternarize */
+ for (j = 0; j < elemcat->elem_count; j++) {
+ if (elemsignature[j] < -th) {
+ ternary = 0;
+ } else if (elemsignature[j] <= th) {
+ ternary = 1;
+ } else {
+ ternary = 2;
+ }
+ fs->framesig[f/5] += ternary * pot3[f%5];
+
+ if (f == wordvec[w]) {
+ fs->words[s2usw[w]/5] += ternary * pot3[wordt2b[s2usw[w]/5]++];
+ if (w < 24)
+ w++;
+ }
+ f++;
+ }
+ av_freep(&elemsignature);
+ av_freep(&sortsignature);
+ }
+
+ /* confidence */
+ qsort(conflist, DIFFELEM_SIZE, sizeof(uint64_t), (void*) cmp);
+ fs->confidence = FFMIN(conflist[DIFFELEM_SIZE/2], 255);
+
+ /* coarsesignature */
+ if (sc->coarsecount == 0) {
+ if (sc->curcoarsesig2) {
+ sc->curcoarsesig1 = av_mallocz(sizeof(CoarseSignature));
+ if (!sc->curcoarsesig1)
+ return AVERROR(ENOMEM);
+ sc->curcoarsesig1->first = fs;
+ sc->curcoarsesig2->next = sc->curcoarsesig1;
+ sc->coarseend = sc->curcoarsesig1;
+ }
+ }
+ if (sc->coarsecount == 45) {
+ sc->midcoarse = 1;
+ sc->curcoarsesig2 = av_mallocz(sizeof(CoarseSignature));
+ if (!sc->curcoarsesig2)
+ return AVERROR(ENOMEM);
+ sc->curcoarsesig2->first = fs;
+ sc->curcoarsesig1->next = sc->curcoarsesig2;
+ sc->coarseend = sc->curcoarsesig2;
+ }
+ for (i = 0; i < 5; i++) {
+ set_bit(sc->curcoarsesig1->data[i], fs->words[i]);
+ }
+ /* assuming the actual frame is the last */
+ sc->curcoarsesig1->last = fs;
+ if (sc->midcoarse) {
+ for (i = 0; i < 5; i++) {
+ set_bit(sc->curcoarsesig2->data[i], fs->words[i]);
+ }
+ sc->curcoarsesig2->last = fs;
+ }
+
+ sc->coarsecount = (sc->coarsecount+1)%90;
+
+ /* debug printing finesignature */
+ if (av_log_get_level() == AV_LOG_DEBUG) {
+ av_log(ctx, AV_LOG_DEBUG, "input %d, confidence: %d\n", FF_INLINK_IDX(inlink), fs->confidence);
+
+ av_log(ctx, AV_LOG_DEBUG, "words:");
+ for (i = 0; i < 5; i++) {
+ av_log(ctx, AV_LOG_DEBUG, " %d:", fs->words[i] );
+ av_log(ctx, AV_LOG_DEBUG, " %d", fs->words[i] / pot3[0] );
+ for (j = 1; j < 5; j++)
+ av_log(ctx, AV_LOG_DEBUG, ",%d", fs->words[i] % pot3[j-1] / pot3[j] );
+ av_log(ctx, AV_LOG_DEBUG, ";");
+ }
+ av_log(ctx, AV_LOG_DEBUG, "\n");
+
+ av_log(ctx, AV_LOG_DEBUG, "framesignature:");
+ for (i = 0; i < SIGELEM_SIZE/5; i++) {
+ av_log(ctx, AV_LOG_DEBUG, " %d", fs->framesig[i] / pot3[0] );
+ for (j = 1; j < 5; j++)
+ av_log(ctx, AV_LOG_DEBUG, ",%d", fs->framesig[i] % pot3[j-1] / pot3[j] );
+ }
+ av_log(ctx, AV_LOG_DEBUG, "\n");
+ }
+
+ if (FF_INLINK_IDX(inlink) == 0)
+ return ff_filter_frame(inlink->dst->outputs[0], picref);
+ return 1;
+}
+
+static int xml_export(AVFilterContext *ctx, StreamContext *sc, const char* filename)
+{
+ FineSignature* fs;
+ CoarseSignature* cs;
+ int i, j;
+ FILE* f;
+ unsigned int pot3[5] = { 3*3*3*3, 3*3*3, 3*3, 3, 1 };
+
+ f = fopen(filename, "w");
+ if (!f) {
+ int err = AVERROR(EINVAL);
+ char buf[128];
+ av_strerror(err, buf, sizeof(buf));
+ av_log(ctx, AV_LOG_ERROR, "cannot open xml file %s: %s\n", filename, buf);
+ return err;
+ }
+
+ /* header */
+ fprintf(f, "<?xml version='1.0' encoding='ASCII' ?>\n");
+ fprintf(f, "<Mpeg7 xmlns=\"urn:mpeg:mpeg7:schema:2001\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"urn:mpeg:mpeg7:schema:2001 schema/Mpeg7-2001.xsd\">\n");
+ fprintf(f, " <DescriptionUnit xsi:type=\"DescriptorCollectionType\">\n");
+ fprintf(f, " <Descriptor xsi:type=\"VideoSignatureType\">\n");
+ fprintf(f, " <VideoSignatureRegion>\n");
+ fprintf(f, " <VideoSignatureSpatialRegion>\n");
+ fprintf(f, " <Pixel>0 0 </Pixel>\n");
+ fprintf(f, " <Pixel>%d %d </Pixel>\n", sc->w - 1, sc->h - 1);
+ fprintf(f, " </VideoSignatureSpatialRegion>\n");
+ fprintf(f, " <StartFrameOfSpatialRegion>0</StartFrameOfSpatialRegion>\n");
+ /* hoping num is 1, other values are vague */
+ fprintf(f, " <MediaTimeUnit>%d</MediaTimeUnit>\n", sc->time_base.den / sc->time_base.num);
+ fprintf(f, " <MediaTimeOfSpatialRegion>\n");
+ fprintf(f, " <StartMediaTimeOfSpatialRegion>0</StartMediaTimeOfSpatialRegion>\n");
+ fprintf(f, " <EndMediaTimeOfSpatialRegion>%" PRIu64 "</EndMediaTimeOfSpatialRegion>\n", sc->coarseend->last->pts);
+ fprintf(f, " </MediaTimeOfSpatialRegion>\n");
+
+ /* coarsesignatures */
+ for (cs = sc->coarsesiglist; cs; cs = cs->next) {
+ fprintf(f, " <VSVideoSegment>\n");
+ fprintf(f, " <StartFrameOfSegment>%" PRIu32 "</StartFrameOfSegment>\n", cs->first->index);
+ fprintf(f, " <EndFrameOfSegment>%" PRIu32 "</EndFrameOfSegment>\n", cs->last->index);
+ fprintf(f, " <MediaTimeOfSegment>\n");
+ fprintf(f, " <StartMediaTimeOfSegment>%" PRIu64 "</StartMediaTimeOfSegment>\n", cs->first->pts);
+ fprintf(f, " <EndMediaTimeOfSegment>%" PRIu64 "</EndMediaTimeOfSegment>\n", cs->last->pts);
+ fprintf(f, " </MediaTimeOfSegment>\n");
+ for (i = 0; i < 5; i++) {
+ fprintf(f, " <BagOfWords>");
+ for (j = 0; j < 31; j++) {
+ uint8_t n = cs->data[i][j];
+ if (j < 30) {
+ fprintf(f, "%d %d %d %d %d %d %d %d ", (n & 0x80) >> 7,
+ (n & 0x40) >> 6,
+ (n & 0x20) >> 5,
+ (n & 0x10) >> 4,
+ (n & 0x08) >> 3,
+ (n & 0x04) >> 2,
+ (n & 0x02) >> 1,
+ (n & 0x01));
+ } else {
+ /* print only 3 bit in last byte */
+ fprintf(f, "%d %d %d ", (n & 0x80) >> 7,
+ (n & 0x40) >> 6,
+ (n & 0x20) >> 5);
+ }
+ }
+ fprintf(f, "</BagOfWords>\n");
+ }
+ fprintf(f, " </VSVideoSegment>\n");
+ }
+
+ /* finesignatures */
+ for (fs = sc->finesiglist; fs; fs = fs->next) {
+ fprintf(f, " <VideoFrame>\n");
+ fprintf(f, " <MediaTimeOfFrame>%" PRIu64 "</MediaTimeOfFrame>\n", fs->pts);
+ /* confidence */
+ fprintf(f, " <FrameConfidence>%d</FrameConfidence>\n", fs->confidence);
+ /* words */
+ fprintf(f, " <Word>");
+ for (i = 0; i < 5; i++) {
+ fprintf(f, "%d ", fs->words[i]);
+ if (i < 4) {
+ fprintf(f, " ");
+ }
+ }
+ fprintf(f, "</Word>\n");
+ /* framesignature */
+ fprintf(f, " <FrameSignature>");
+ for (i = 0; i< SIGELEM_SIZE/5; i++) {
+ if (i > 0) {
+ fprintf(f, " ");
+ }
+ fprintf(f, "%d ", fs->framesig[i] / pot3[0]);
+ for (j = 1; j < 5; j++)
+ fprintf(f, " %d ", fs->framesig[i] % pot3[j-1] / pot3[j] );
+ }
+ fprintf(f, "</FrameSignature>\n");
+ fprintf(f, " </VideoFrame>\n");
+ }
+ fprintf(f, " </VideoSignatureRegion>\n");
+ fprintf(f, " </Descriptor>\n");
+ fprintf(f, " </DescriptionUnit>\n");
+ fprintf(f, "</Mpeg7>\n");
+
+ fclose(f);
+ return 0;
+}
+
+static int binary_export(AVFilterContext *ctx, StreamContext *sc, const char* filename)
+{
+ FILE* f;
+ FineSignature* fs;
+ CoarseSignature* cs;
+ uint32_t numofsegments = (sc->lastindex + 44)/45;
+ int i, j;
+ PutBitContext buf;
+ /* buffer + header + coarsesignatures + finesignature */
+ int len = (512 + 6 * 32 + 3*16 + 2 +
+ numofsegments * (4*32 + 1 + 5*243) +
+ sc->lastindex * (2 + 32 + 6*8 + 608)) / 8;
+ uint8_t* buffer = av_malloc_array(len, sizeof(uint8_t));
+ if (!buffer)
+ return AVERROR(ENOMEM);
+
+ f = fopen(filename, "wb");
+ if (!f) {
+ int err = AVERROR(EINVAL);
+ char buf[128];
+ av_strerror(err, buf, sizeof(buf));
+ av_log(ctx, AV_LOG_ERROR, "cannot open file %s: %s\n", filename, buf);
+ return err;
+ }
+ init_put_bits(&buf, buffer, len);
+
+ put_bits32(&buf, 1); /* NumOfSpatial Regions, only 1 supported */
+ put_bits(&buf, 1, 1); /* SpatialLocationFlag, always the whole image */
+ put_bits32(&buf, 0); /* PixelX,1 PixelY,1, 0,0 */
+ put_bits(&buf, 16, sc->w-1 & 0xFFFF); /* PixelX,2 */
+ put_bits(&buf, 16, sc->h-1 & 0xFFFF); /* PixelY,2 */
+ put_bits32(&buf, 0); /* StartFrameOfSpatialRegion */
+ put_bits32(&buf, sc->lastindex); /* NumOfFrames */
+ /* hoping num is 1, other values are vague */
+ /* den/num might be greater than 16 bit, so cutting it */
+ put_bits(&buf, 16, 0xFFFF & (sc->time_base.den / sc->time_base.num)); /* MediaTimeUnit */
+ put_bits(&buf, 1, 1); /* MediaTimeFlagOfSpatialRegion */
+ put_bits32(&buf, 0); /* StartMediaTimeOfSpatialRegion */
+ put_bits32(&buf, 0xFFFFFFFF & sc->coarseend->last->pts); /* EndMediaTimeOfSpatialRegion */
+ put_bits32(&buf, numofsegments); /* NumOfSegments */
+ /* coarsesignatures */
+ for (cs = sc->coarsesiglist; cs; cs = cs->next) {
+ put_bits32(&buf, cs->first->index); /* StartFrameOfSegment */
+ put_bits32(&buf, cs->last->index); /* EndFrameOfSegment */
+ put_bits(&buf, 1, 1); /* MediaTimeFlagOfSegment */
+ put_bits32(&buf, 0xFFFFFFFF & cs->first->pts); /* StartMediaTimeOfSegment */
+ put_bits32(&buf, 0xFFFFFFFF & cs->last->pts); /* EndMediaTimeOfSegment */
+ for (i = 0; i < 5; i++) {
+ /* put 243 bits ( = 7 * 32 + 19 = 8 * 28 + 19) into buffer */
+ for (j = 0; j < 30; j++) {
+ put_bits(&buf, 8, cs->data[i][j]);
+ }
+ put_bits(&buf, 3, cs->data[i][30] >> 5);
+ }
+ }
+ /* finesignatures */
+ put_bits(&buf, 1, 0); /* CompressionFlag, only 0 supported */
+ for (fs = sc->finesiglist; fs; fs = fs->next) {
+ put_bits(&buf, 1, 1); /* MediaTimeFlagOfFrame */
+ put_bits32(&buf, 0xFFFFFFFF & fs->pts); /* MediaTimeOfFrame */
+ put_bits(&buf, 8, fs->confidence); /* FrameConfidence */
+ for (i = 0; i < 5; i++) {
+ put_bits(&buf, 8, fs->words[i]); /* Words */
+ }
+ /* framesignature */
+ for (i = 0; i < SIGELEM_SIZE/5; i++) {
+ put_bits(&buf, 8, fs->framesig[i]);
+ }
+ }
+
+ avpriv_align_put_bits(&buf);
+ flush_put_bits(&buf);
+ fwrite(buffer, 1, put_bits_count(&buf)/8, f);
+ fclose(f);
+ av_freep(&buffer);
+ return 0;
+}
+
+static int export(AVFilterContext *ctx, StreamContext *sc, int input)
+{
+ SignatureContext* sic = ctx->priv;
+ char filename[1024];
+
+ if (sic->nb_inputs > 1) {
+ /* error already handled */
+ av_assert0(av_get_frame_filename(filename, sizeof(filename), sic->filename, input) == 0);
+ } else {
+ strcpy(filename, sic->filename);
+ }
+ if (sic->format == FORMAT_XML) {
+ return xml_export(ctx, sc, filename);
+ } else {
+ return binary_export(ctx, sc, filename);
+ }
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ SignatureContext *sic = ctx->priv;
+ StreamContext *sc, *sc2;
+ MatchingInfo match;
+ int i, j, ret;
+ int lookup = 1; /* indicates wheather EOF of all files is reached */
+
+ /* process all inputs */
+ for (i = 0; i < sic->nb_inputs; i++){
+ sc = &(sic->streamcontexts[i]);
+
+ ret = ff_request_frame(ctx->inputs[i]);
+
+ /* return if unexpected error occurs in input stream */
+ if (ret < 0 && ret != AVERROR_EOF)
+ return ret;
+
+ /* export signature at EOF */
+ if (ret == AVERROR_EOF && !sc->exported) {
+ /* export if wanted */
+ if (strlen(sic->filename) > 0) {
+ if (export(ctx, sc, i) < 0)
+ return ret;
+ }
+ sc->exported = 1;
+ }
+ lookup &= sc->exported;
+ }
+
+ /* signature lookup */
+ if (lookup && sic->mode != MODE_OFF) {
+ /* iterate over every pair */
+ for (i = 0; i < sic->nb_inputs; i++) {
+ sc = &(sic->streamcontexts[i]);
+ for (j = i+1; j < sic->nb_inputs; j++) {
+ sc2 = &(sic->streamcontexts[j]);
+ match = lookup_signatures(ctx, sic, sc, sc2, sic->mode);
+ if (match.score != 0) {
+ av_log(ctx, AV_LOG_INFO, "matching of video %d at %f and %d at %f, %d frames matching\n",
+ i, ((double) match.first->pts * sc->time_base.num) / sc->time_base.den,
+ j, ((double) match.second->pts * sc2->time_base.num) / sc2->time_base.den,
+ match.matchframes);
+ if (match.whole)
+ av_log(ctx, AV_LOG_INFO, "whole video matching\n");
+ } else {
+ av_log(ctx, AV_LOG_INFO, "no matching of video %d and %d\n", i, j);
+ }
+ }
+ }
+ }
+
+ return ret;
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+
+ SignatureContext *sic = ctx->priv;
+ StreamContext *sc;
+ int i, ret;
+ char tmp[1024];
+
+ sic->streamcontexts = av_mallocz(sic->nb_inputs * sizeof(StreamContext));
+ if (!sic->streamcontexts)
+ return AVERROR(ENOMEM);
+
+ for (i = 0; i < sic->nb_inputs; i++) {
+ AVFilterPad pad = {
+ .type = AVMEDIA_TYPE_VIDEO,
+ .name = av_asprintf("in%d", i),
+ .config_props = config_input,
+ .filter_frame = filter_frame,
+ };
+
+ if (!pad.name)
+ return AVERROR(ENOMEM);
+
+ sc = &(sic->streamcontexts[i]);
+
+ sc->lastindex = 0;
+ sc->finesiglist = av_mallocz(sizeof(FineSignature));
+ if (!sc->finesiglist)
+ return AVERROR(ENOMEM);
+ sc->curfinesig = NULL;
+
+ sc->coarsesiglist = av_mallocz(sizeof(CoarseSignature));
+ if (!sc->coarsesiglist)
+ return AVERROR(ENOMEM);
+ sc->curcoarsesig1 = sc->coarsesiglist;
+ sc->coarseend = sc->coarsesiglist;
+ sc->coarsecount = 0;
+ sc->midcoarse = 0;
+
+ if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
+ av_freep(&pad.name);
+ return ret;
+ }
+ }
+
+ /* check filename */
+ if (sic->nb_inputs > 1 && strlen(sic->filename) > 0 && av_get_frame_filename(tmp, sizeof(tmp), sic->filename, 0) == -1) {
+ av_log(ctx, AV_LOG_ERROR, "The filename must contain %%d or %%0nd, if you have more than one input.\n");
+ return AVERROR(EINVAL);
+ }
+
+ return 0;
+}
+
+
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ SignatureContext *sic = ctx->priv;
+ StreamContext *sc;
+ void* tmp;
+ FineSignature* finsig;
+ CoarseSignature* cousig;
+ int i;
+
+
+ /* free the lists */
+ if (sic->streamcontexts != NULL) {
+ for (i = 0; i < sic->nb_inputs; i++) {
+ sc = &(sic->streamcontexts[i]);
+ finsig = sc->finesiglist;
+ cousig = sc->coarsesiglist;
+
+ while (finsig) {
+ tmp = finsig;
+ finsig = finsig->next;
+ av_freep(&tmp);
+ }
+ sc->finesiglist = NULL;
+
+ while (cousig) {
+ tmp = cousig;
+ cousig = cousig->next;
+ av_freep(&tmp);
+ }
+ sc->coarsesiglist = NULL;
+ }
+ av_freep(&sic->streamcontexts);
+ }
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ AVFilterLink *inlink = ctx->inputs[0];
+
+ outlink->time_base = inlink->time_base;
+ outlink->frame_rate = inlink->frame_rate;
+ outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
+ outlink->w = inlink->w;
+ outlink->h = inlink->h;
+
+ return 0;
+}
+
+static const AVFilterPad signature_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .request_frame = request_frame,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_signature = {
+ .name = "signature",
+ .description = NULL_IF_CONFIG_SMALL("Calculate the MPEG-7 video signature"),
+ .priv_size = sizeof(SignatureContext),
+ .priv_class = &signature_class,
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .outputs = signature_outputs,
+ .inputs = NULL,
+ .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
+};
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