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vp9: Adjustments for ARF usage in 1 pass vbr.

Only when USE_ALT_REF_ONE_PASS is enabled (off by default).
Force fixed partition to 64x64 when is_src_alt_ref_frame is true,
and don't force early exit for some modes in nonrd_pickmode
for ARF noshow frames.

Small gain ~0.2% on ytlive metrics for speed 6.
Neutral speed difference.

Change-Id: I27eb6622d0453c09a06ccdc3b16368762474d11d

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -4179,7 +4179,7 @@

       int sb_offset2 = ((cm->mi_cols + 7) >> 3) * (mi_row >> 3) + (mi_col >> 3);

       int64_t source_sad = avg_source_sad(cpi, x, shift, sb_offset2);

       if (sf->adapt_partition_source_sad &&

-          (cpi->oxcf.rc_mode == VPX_VBR &&

+          (cpi->oxcf.rc_mode == VPX_VBR && !cpi->rc.is_src_frame_alt_ref &&

            source_sad > sf->adapt_partition_thresh &&

            cpi->refresh_golden_frame))

         partition_search_type = REFERENCE_PARTITION;

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

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

@@ -1669,13 +1669,13 @@

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

         continue;

-      if (cpi->rc.alt_ref_gf_group &&

+      if (cpi->rc.alt_ref_gf_group && cm->show_frame &&

           cpi->rc.frames_since_golden > (cpi->rc.baseline_gf_interval >> 1) &&

           ref_frame == GOLDEN_FRAME &&

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

         continue;

-      if (cpi->rc.alt_ref_gf_group &&

+      if (cpi->rc.alt_ref_gf_group && cm->show_frame &&

           cpi->rc.frames_since_golden < (cpi->rc.baseline_gf_interval >> 1) &&

           ref_frame == ALTREF_FRAME &&

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

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -523,6 +523,11 @@

   if (speed >= 6) {

     sf->partition_search_type = VAR_BASED_PARTITION;

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

+        cpi->rc.is_src_frame_alt_ref && !is_keyframe) {

+      sf->partition_search_type = FIXED_PARTITION;

+      sf->always_this_block_size = BLOCK_64X64;

+    }

     // Turn on this to use non-RD key frame coding mode.

     sf->use_nonrd_pick_mode = 1;

     sf->mv.search_method = NSTEP;

-- 

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