shithub: libvpx

Info  •  Files  •  Log  •  Branches

vp9: Add zero_temp_sad count to scene detection.

For real-time screen-content mode: makes the
scene/slide change detection more robust.

Change-Id: I28d8d28b42bb92d527811f814bf14bbbbb53ab25

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -2640,6 +2640,7 @@

     int frames_to_buffer = 1;

     int frame = 0;

     int scene_cut_force_key_frame = 0;

+    int num_zero_temp_sad = 0;

     uint64_t avg_sad_current = 0;

     uint32_t min_thresh = 10000;

     float thresh = 8.0f;

@@ -2703,6 +2704,7 @@

           last_src_y = frames[frame + 1]->y_buffer;

           last_src_ystride = frames[frame + 1]->y_stride;

         }

+        num_zero_temp_sad = 0;

         for (sbi_row = 0; sbi_row < sb_rows; ++sbi_row) {

           for (sbi_col = 0; sbi_col < sb_cols; ++sbi_col) {

             // Checker-board pattern, ignore boundary.

@@ -2714,6 +2716,7 @@

                                                last_src_ystride);

               avg_sad += tmp_sad;

               num_samples++;

+              if (tmp_sad == 0) num_zero_temp_sad++;

             }

             src_y += 64;

             last_src_y += 64;

@@ -2730,7 +2733,8 @@

           if (avg_sad >

                   VPXMAX(min_thresh,

                          (unsigned int)(rc->avg_source_sad[0] * thresh)) &&

-              rc->frames_since_key > 1)

+              rc->frames_since_key > 1 &&

+              num_zero_temp_sad < 3 * (num_samples >> 2))

             rc->high_source_sad = 1;

           else

             rc->high_source_sad = 0;