shithub: libvpx

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vp9-rtc: Modify skip golden mode check for 1 layer

For real-time CBR mode: golden reference mode testing is
skipped under certain conditons based on sse of zero-last mode.
This was done for svc mode. Here we add similar condition
for non-svc/1 layer encoding.

Reduces flashing block artifacts that can occur in background
areas with noise.

Change-Id: I93f71ea9507af8c9153fc6c0ba7dcc7a0fa8810d

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -1699,6 +1699,7 @@

   int svc_mv_row = 0;

   int no_scaling = 0;

   unsigned int thresh_svc_skip_golden = 500;

+  unsigned int thresh_skip_golden = (bsize >= BLOCK_32X32) ? 5000 : 1000;

   int scene_change_detected =

       cpi->rc.high_source_sad ||

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

@@ -2018,10 +2019,11 @@

       if (segfeature_active(seg, mi->segment_id, SEG_LVL_REF_FRAME)) continue;

     }

-    // For SVC, skip the golden (spatial) reference search if sse of zeromv_last

-    // is below threshold.

-    if (cpi->use_svc && ref_frame == GOLDEN_FRAME &&

-        sse_zeromv_normalized < thresh_svc_skip_golden)

+    // For CBR mode: skip the golden reference search if sse of zeromv_last is

+    // below threshold.

+    if (ref_frame == GOLDEN_FRAME && cpi->oxcf.rc_mode == VPX_CBR &&

+        ((cpi->use_svc && sse_zeromv_normalized < thresh_svc_skip_golden) ||

+         (!cpi->use_svc && sse_zeromv_normalized < thresh_skip_golden)))

       continue;

     if (!(cpi->ref_frame_flags & flag_list[ref_frame])) continue;

@@ -2240,7 +2242,7 @@

                           &var_y, &sse_y);

       }

       // Save normalized sse (between current and last frame) for (0, 0) motion.

-      if (cpi->use_svc && ref_frame == LAST_FRAME &&

+      if (ref_frame == LAST_FRAME &&

           frame_mv[this_mode][ref_frame].as_int == 0) {

         sse_zeromv_normalized =

             sse_y >> (b_width_log2_lookup[bsize] + b_height_log2_lookup[bsize]);