shithub: libvpx

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vp9: Adjust condition for checking intra mode.

For nonrd_pickmode: add condition for checking
intra mode if the sb content state is VeryHighSad.

Reduces artifacts when sudden change in content.

Metrics on RTC/RTC_derf neutral (small gain).
No speed loss observed.

Change-Id: I07006d28fd2dc06c1d06b07630102b0fece50c40

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

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

@@ -2096,7 +2096,8 @@

   // Perform intra prediction search, if the best SAD is above a certain

   // threshold.

   if (best_rdc.rdcost == INT64_MAX ||

-      ((!force_skip_low_temp_var || bsize < BLOCK_32X32) &&

+      ((!force_skip_low_temp_var || bsize < BLOCK_32X32 ||

+        x->content_state_sb == kVeryHighSad) &&

        perform_intra_pred && !x->skip && best_rdc.rdcost > inter_mode_thresh &&

        bsize <= cpi->sf.max_intra_bsize && !x->skip_low_source_sad &&

        !x->lowvar_highsumdiff)) {