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vp9 level targeting: more strict constraint on min_gf_interval

min_gf_interval should be no less than min_altref_distance + 1,
as the encoder may produce bitstream with alt-ref distance being
min_gf_interval - 1.

BUG=b/38450599

Change-Id: Ifb733daa643ebc668d1b23e1ce92db94b66dabe8

--- a/vp9/vp9_cx_iface.c

+++ b/vp9/vp9_cx_iface.c

@@ -425,10 +425,16 @@

   oxcf->worst_allowed_q = vp9_quantizer_to_qindex(63);

   // Adjust minimum art-ref distance.

-  if (oxcf->min_gf_interval <

-      (int)vp9_level_defs[target_level_index].min_altref_distance)

+  // min_gf_interval should be no less than min_altref_distance + 1,

+  // as the encoder may produce bitstream with alt-ref distance being

+  // min_gf_interval - 1.

+  if (oxcf->min_gf_interval <=

+      (int)vp9_level_defs[target_level_index].min_altref_distance) {

     oxcf->min_gf_interval =

-        (int)vp9_level_defs[target_level_index].min_altref_distance;

+        (int)vp9_level_defs[target_level_index].min_altref_distance + 1;

+    oxcf->max_gf_interval =

+        VPXMAX(oxcf->max_gf_interval, oxcf->min_gf_interval);

+  }

   // Adjust maximum column tiles.

   if (vp9_level_defs[target_level_index].max_col_tiles <