shithub: libvpx

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vp9-rtc: Adjust force split logic for screen mode

In variance partition for screen content mode:
force split to 32x32 if source pre-process detects
non-zero temporal sad.
Reduce artifacts in scroll motion content.

Change-Id: Ifbe2b500eb03ae853faa28a045ce4f1185443939

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -1265,9 +1265,10 @@

   int pixels_wide = 64, pixels_high = 64;

   int64_t thresholds[4] = { cpi->vbp_thresholds[0], cpi->vbp_thresholds[1],

                             cpi->vbp_thresholds[2], cpi->vbp_thresholds[3] };

-  int scene_change_detected =

+  int force_64_split =

       cpi->rc.high_source_sad ||

-      (cpi->use_svc && cpi->svc.high_source_sad_superframe);

+      (cpi->use_svc && cpi->svc.high_source_sad_superframe) ||

+      (cpi->oxcf.content == VP9E_CONTENT_SCREEN && !x->zero_temp_sad_source);

   // For the variance computation under SVC mode, we treat the frame as key if

   // the reference (base layer frame) is key frame (i.e., is_key_frame == 1).

@@ -1330,7 +1331,7 @@

     }

     // If source_sad is low copy the partition without computing the y_sad.

     if (x->skip_low_source_sad && cpi->sf.copy_partition_flag &&

-        !scene_change_detected &&

+        !force_64_split &&

         copy_partitioning(cpi, x, xd, mi_row, mi_col, segment_id, sb_offset)) {

       x->sb_use_mv_part = 1;

       if (cpi->sf.svc_use_lowres_part &&

@@ -1359,7 +1360,7 @@

   // Index for force_split: 0 for 64x64, 1-4 for 32x32 blocks,

   // 5-20 for the 16x16 blocks.

-  force_split[0] = scene_change_detected;

+  force_split[0] = force_64_split;

   if (!is_key_frame) {

     // In the case of spatial/temporal scalable coding, the assumption here is