shithub: libvpx

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vp9-aqmode=3: Limit on period for golden update.

For aqmode=3, golden period update is set based on period of cyclic refresh.
Put a limit on max golden period update, for now set to 40.
And fix comment.

Change-Id: Icb61dd87c796cce2a5f5f7331c6a129540994696

--- a/vp9/encoder/vp9_aq_cyclicrefresh.c

+++ b/vp9/encoder/vp9_aq_cyclicrefresh.c

@@ -321,11 +321,11 @@

 void vp9_cyclic_refresh_set_golden_update(VP9_COMP *const cpi) {

   RATE_CONTROL *const rc = &cpi->rc;

   CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;

-  // Set minimum gf_interval for GF update to a multiple (== 2) of refresh

-  // period. Depending on past encoding stats, GF flag may be reset and update

-  // may not occur until next baseline_gf_interval.

+  // Set minimum gf_interval for GF update to a multiple of the refresh period,

+  // with some max limit. Depending on past encoding stats, GF flag may be

+  // reset and update may not occur until next baseline_gf_interval.

   if (cr->percent_refresh > 0)

-    rc->baseline_gf_interval = 4 * (100 / cr->percent_refresh);

+    rc->baseline_gf_interval = VPXMIN(4 * (100 / cr->percent_refresh), 40);

   else

     rc->baseline_gf_interval = 40;

 }