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vp9: 1 pass vbr: Skip find_predictors in pickmode when source is altref.

When source frame is altref, we only do zero-mv mode, so we can skip
the find_predictors(). No change in compression.
Small speed gain, ~1%.

Only affects 1 pass vbr with lookhead altref, for ytlive with
the macro flag USE_ALTREF_FOR_ONE_PASS on.

Change-Id: I9318c5da8521f017bf54919cd652438b3a6313d1

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

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

@@ -1396,6 +1396,7 @@

   int perform_intra_pred = 1;

   int use_golden_nonzeromv = 1;

   int force_skip_low_temp_var = 0;

+  int skip_ref_find_pred[4] = { 0 };

 #if CONFIG_VP9_TEMPORAL_DENOISING

   VP9_PICKMODE_CTX_DEN ctx_den;

   int64_t zero_last_cost_orig = INT64_MAX;

@@ -1470,10 +1471,16 @@

     usable_ref_frame = GOLDEN_FRAME;

   }

-  if (cpi->oxcf.lag_in_frames > 0 && cpi->oxcf.rc_mode == VPX_VBR &&

-      (cpi->rc.alt_ref_gf_group || cpi->rc.is_src_frame_alt_ref))

-    usable_ref_frame = ALTREF_FRAME;

+  if (cpi->oxcf.lag_in_frames > 0 && cpi->oxcf.rc_mode == VPX_VBR) {

+    if (cpi->rc.alt_ref_gf_group || cpi->rc.is_src_frame_alt_ref)

+      usable_ref_frame = ALTREF_FRAME;

+    if (cpi->rc.is_src_frame_alt_ref) {

+      skip_ref_find_pred[LAST_FRAME] = 1;

+      skip_ref_find_pred[GOLDEN_FRAME] = 1;

+    }

+  }

+

   // For svc mode, on spatial_layer_id > 0: if the reference has different scale

   // constrain the inter mode to only test zero motion.

   if (cpi->use_svc && svc->force_zero_mode_spatial_ref &&

@@ -1505,9 +1512,11 @@

     use_golden_nonzeromv = 0;

   for (ref_frame = LAST_FRAME; ref_frame <= usable_ref_frame; ++ref_frame) {

-    find_predictors(cpi, x, ref_frame, frame_mv, const_motion,

-                    &ref_frame_skip_mask, flag_list, tile_data, mi_row, mi_col,

-                    yv12_mb, bsize, force_skip_low_temp_var);

+    if (!skip_ref_find_pred[ref_frame]) {

+      find_predictors(cpi, x, ref_frame, frame_mv, const_motion,

+                      &ref_frame_skip_mask, flag_list, tile_data, mi_row,

+                      mi_col, yv12_mb, bsize, force_skip_low_temp_var);

+    }

   }

   for (idx = 0; idx < RT_INTER_MODES; ++idx) {

@@ -1527,6 +1536,7 @@

       ref_frame = ref_mode_set_svc[idx].ref_frame;

     }

     if (ref_frame > usable_ref_frame) continue;

+    if (skip_ref_find_pred[ref_frame]) continue;

     if (sf->short_circuit_flat_blocks && x->source_variance == 0 &&

         this_mode != NEARESTMV) {