avfilter: add datascope filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Changelog

@@ -7,6 +7,7 @@ version <next>:
 - loop video filter and aloop audio filter
 - Bob Weaver deinterlacing filter
 - firequalizer filter
+- datascope filter
 
 
 version 3.0:

doc/filters.texi

@@ -5240,6 +5240,43 @@ curves=psfile='MyCurvesPresets/purple.acv':green='0.45/0.53'
 @end example
 @end itemize
 
+@section datascope
+
+Video data analysis filter.
+
+This filter shows hexadecimal pixel values of part of video.
+
+The filter accepts the following options:
+
+@table @option
+@item size, s
+Set output video size.
+
+@item x
+Set x offset from where to pick pixels.
+
+@item y
+Set y offset from where to pick pixels.
+
+@item mode
+Set scope mode, can be one of the following:
+@table @samp
+@item mono
+Draw hexadecimal pixel values with white color on black background.
+
+@item color
+Draw hexadecimal pixel values with input video pixel color on black
+background.
+
+@item color2
+Draw hexadecimal pixel values on color background picked from input video,
+the text color is picked in such way so its always visible.
+@end table
+
+@item axis
+Draw rows and columns numbers on left and top of video.
+@end table
+
 @section dctdnoiz
 
 Denoise frames using 2D DCT (frequency domain filtering).

libavfilter/Makefile

@@ -134,6 +134,7 @@ OBJS-$(CONFIG_COVER_RECT_FILTER)             += vf_cover_rect.o lavfutils.o
 OBJS-$(CONFIG_CROP_FILTER)                   += vf_crop.o
 OBJS-$(CONFIG_CROPDETECT_FILTER)             += vf_cropdetect.o
 OBJS-$(CONFIG_CURVES_FILTER)                 += vf_curves.o
+OBJS-$(CONFIG_DATASCOPE_FILTER)              += vf_datascope.o
 OBJS-$(CONFIG_DCTDNOIZ_FILTER)               += vf_dctdnoiz.o
 OBJS-$(CONFIG_DEBAND_FILTER)                 += vf_deband.o
 OBJS-$(CONFIG_DECIMATE_FILTER)               += vf_decimate.o

libavfilter/allfilters.c

@@ -155,6 +155,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(CROP,           crop,           vf);
     REGISTER_FILTER(CROPDETECT,     cropdetect,     vf);
     REGISTER_FILTER(CURVES,         curves,         vf);
+    REGISTER_FILTER(DATASCOPE,      datascope,      vf);
     REGISTER_FILTER(DCTDNOIZ,       dctdnoiz,       vf);
     REGISTER_FILTER(DEBAND,         deband,         vf);
     REGISTER_FILTER(DECIMATE,       decimate,       vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  36
+#define LIBAVFILTER_VERSION_MINOR  37
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \