shithub: libvpx

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Adjust rate allocation in non-RD coding mode

This commit reduces the frequency of frames using finer quantizer
in non-RD coding flow, and slightly tune up the quantizer resolution
when used. It provides 1.7% compression gains in speed -5 at no speed
difference.

Change-Id: I430249a51260a841a0402666e5ec1566e4f7d5a6

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

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

@@ -193,9 +193,8 @@

   int var = cpi->fn_ptr[bs].vf(p->src.buf, p->src.stride,

                                pd->dst.buf, pd->dst.stride, &sse);

-  vp9_model_rd_from_var_lapndz(var + sse, 1 << num_pels_log2_lookup[bs],

+  vp9_model_rd_from_var_lapndz(sse + var, 1 << num_pels_log2_lookup[bs],

                                pd->dequant[1] >> 3, &rate, &dist);

-

   *out_rate_sum = rate;

   *out_dist_sum = dist << 3;

 }

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -985,8 +985,8 @@

       q /= 3;

     if (q == 0)

       q++;

-    if (cpi->sf.partition_check == 1)

-      q -= 10;

+    if (cpi->sf.force_ref_frame == 1)

+      q -= 15;

     if (q < *bottom_index)

       *bottom_index = q;

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

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

@@ -251,6 +251,9 @@

     sf->min_partition_size = BLOCK_8X8;

     sf->partition_check =

         (cm->current_video_frame % sf->last_partitioning_redo_frequency == 1);

+    sf->force_ref_frame =

+        (cm->current_video_frame %

+            (sf->last_partitioning_redo_frequency << 1) == 1);

     sf->partition_search_type = REFERENCE_PARTITION;

     sf->use_nonrd_pick_mode = 1;

     sf->search_method = FAST_DIAMOND;

@@ -303,6 +306,7 @@

   sf->last_partitioning_redo_frequency = 4;

   sf->disable_split_mask = 0;

   sf->mode_search_skip_flags = 0;

+  sf->force_ref_frame = 0;

   sf->disable_split_var_thresh = 0;

   sf->disable_filter_search_var_thresh = 0;

   for (i = 0; i < TX_SIZES; i++) {

--- a/vp9/encoder/vp9_speed_features.h

+++ b/vp9/encoder/vp9_speed_features.h

@@ -252,6 +252,10 @@

   // encoding process for RTC.

   int partition_check;

+  // Use finer quantizer in every other few frames that run variable block

+  // partition type search.

+  int force_ref_frame;

+

   // Implements various heuristics to skip searching modes

   // The heuristics selected are based on  flags

   // defined in the MODE_SEARCH_SKIP_HEURISTICS enum