libavfilter: add colormatrix filter

Ported by: Baptiste Coudurier
cleanup+fate by ubitux
For detailed authorship of the original code please see avisynth

configure

@@ -1670,6 +1670,7 @@ aresample_filter_deps="swresample"
 ass_filter_deps="libass"
 blackframe_filter_deps="gpl"
 boxblur_filter_deps="gpl"
+colormatrix_filter_deps="gpl"
 cropdetect_filter_deps="gpl"
 delogo_filter_deps="gpl"
 drawtext_filter_deps="libfreetype"

doc/filters.texi

@@ -918,6 +918,18 @@ boxblur=min(h\,w)/10:1:min(cw\,ch)/10:1
 
 @end itemize
 
+@section colormatrix
+
+The colormatrix filter allows conversion between any of the following color
+space: BT.709 (@var{bt709}), BT.601 (@var{bt601}), SMPTE-240M (@var{smpte240m})
+and FCC (@var{fcc}).
+
+The syntax of the parameters is @var{source}:@var{destination}:
+
+@example
+colormatrix=bt601:smpte240m
+@end example
+
 @section copy
 
 Copy the input source unchanged to the output. Mainly useful for

libavfilter/Makefile

@@ -52,6 +52,7 @@ OBJS-$(CONFIG_BBOX_FILTER)                   += bbox.o vf_bbox.o
 OBJS-$(CONFIG_BLACKDETECT_FILTER)            += vf_blackdetect.o
 OBJS-$(CONFIG_BLACKFRAME_FILTER)             += vf_blackframe.o
 OBJS-$(CONFIG_BOXBLUR_FILTER)                += vf_boxblur.o
+OBJS-$(CONFIG_COLORMATRIX_FILTER)            += vf_colormatrix.o
 OBJS-$(CONFIG_COPY_FILTER)                   += vf_copy.o
 OBJS-$(CONFIG_CROP_FILTER)                   += vf_crop.o
 OBJS-$(CONFIG_CROPDETECT_FILTER)             += vf_cropdetect.o

libavfilter/allfilters.c

@@ -60,6 +60,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER (BLACKDETECT, blackdetect, vf);
     REGISTER_FILTER (BLACKFRAME,  blackframe,  vf);
     REGISTER_FILTER (BOXBLUR,     boxblur,     vf);
+    REGISTER_FILTER (COLORMATRIX, colormatrix, vf);
     REGISTER_FILTER (COPY,        copy,        vf);
     REGISTER_FILTER (CROP,        crop,        vf);
     REGISTER_FILTER (CROPDETECT,  cropdetect,  vf);

tests/lavfi-regression.sh

@@ -28,6 +28,11 @@ do_lavfi() {
     fi
 }
 
+do_lavfi_colormatrix() {
+    do_lavfi "${1}1" "$1=$4:$5,$1=$5:$3,$1=$3:$4,$1=$4:$3,$1=$3:$5,$1=$5:$2"
+    do_lavfi "${1}2" "$1=$2:$3,$1=$3:$2,$1=$2:$4,$1=$4:$2,$1=$2:$5,$1=$5:$4"
+}
+
 do_lavfi "crop"               "crop=iw-100:ih-100:100:100"
 do_lavfi "crop_scale"         "crop=iw-100:ih-100:100:100,scale=400:-1"
 do_lavfi "crop_scale_vflip"   "null,null,crop=iw-200:ih-200:200:200,crop=iw-20:ih-20:20:20,scale=200:200,scale=250:250,vflip,vflip,null,scale=200:200,crop=iw-100:ih-100:100:100,vflip,scale=200:200,null,vflip,crop=iw-100:ih-100:100:100,null"
@@ -55,6 +60,8 @@ do_lavfi "vflip"              "vflip"
 do_lavfi "vflip_crop"         "vflip,crop=iw-100:ih-100:100:100"
 do_lavfi "vflip_vflip"        "vflip,vflip"
 
+do_lavfi_colormatrix "colormatrix" bt709 fcc bt601 smpte240m
+
 do_lavfi_pixfmts(){
     test ${test%_[bl]e} = pixfmts_$1 || return 0
     filter=$1