avfilter/vf_select: use common scene sad functions

Signed-off-by: Marton Balint <cus@passwd.hu>

configure

@@ -3445,7 +3445,7 @@ sab_filter_deps="gpl swscale"
 scale2ref_filter_deps="swscale"
 scale_filter_deps="swscale"
 scale_qsv_filter_deps="libmfx"
-select_filter_select="pixelutils"
+select_filter_select="scene_sad"
 sharpness_vaapi_filter_deps="vaapi"
 showcqt_filter_deps="avcodec avformat swscale"
 showcqt_filter_suggest="libfontconfig libfreetype"

libavfilter/f_select.c

@@ -28,12 +28,12 @@
 #include "libavutil/fifo.h"
 #include "libavutil/internal.h"
 #include "libavutil/opt.h"
-#include "libavutil/pixelutils.h"
 #include "avfilter.h"
 #include "audio.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"
+#include "scene_sad.h"
 
 static const char *const var_names[] = {
     "TB",                ///< timebase
@@ -145,7 +145,7 @@ typedef struct SelectContext {
     AVExpr *expr;
     double var_values[VAR_VARS_NB];
     int do_scene_detect;            ///< 1 if the expression requires scene detection variables, 0 otherwise
-    av_pixelutils_sad_fn sad;       ///< Sum of the absolute difference function (scene detect only)
+    ff_scene_sad_fn sad;            ///< Sum of the absolute difference function (scene detect only)
     double prev_mafd;               ///< previous MAFD                           (scene detect only)
     AVFrame *prev_picref;           ///< previous frame                          (scene detect only)
     double select;
@@ -242,7 +242,7 @@ static int config_input(AVFilterLink *inlink)
         inlink->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
 
     if (select->do_scene_detect) {
-        select->sad = av_pixelutils_get_sad_fn(3, 3, 2, select); // 8x8 both sources aligned
+        select->sad = ff_scene_sad_get_fn(8);
         if (!select->sad)
             return AVERROR(EINVAL);
     }
@@ -258,24 +258,12 @@ static double get_scene_score(AVFilterContext *ctx, AVFrame *frame)
     if (prev_picref &&
         frame->height == prev_picref->height &&
         frame->width  == prev_picref->width) {
-        int x, y, nb_sad = 0;
-        int64_t sad = 0;
+        uint64_t sad;
         double mafd, diff;
-        uint8_t *p1 =      frame->data[0];
-        uint8_t *p2 = prev_picref->data[0];
-        const int p1_linesize =       frame->linesize[0];
-        const int p2_linesize = prev_picref->linesize[0];
-
-        for (y = 0; y < frame->height - 7; y += 8) {
-            for (x = 0; x < frame->width*3 - 7; x += 8) {
-                sad += select->sad(p1 + x, p1_linesize, p2 + x, p2_linesize);
-                nb_sad += 8 * 8;
-            }
-            p1 += 8 * p1_linesize;
-            p2 += 8 * p2_linesize;
-        }
+
+        select->sad(prev_picref->data[0], prev_picref->linesize[0], frame->data[0], frame->linesize[0], frame->width * 3, frame->height, &sad);
         emms_c();
-        mafd = nb_sad ? (double)sad / nb_sad : 0;
+        mafd = (double)sad / (frame->width * 3 * frame->height);
         diff = fabs(mafd - select->prev_mafd);
         ret  = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);
         select->prev_mafd = mafd;