shithub: libvpx

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Make frame level quantization change a parameter

Parameterize the frame level quantization index used in non-RD
coding flow with cbr.

Change-Id: I79cfbd9c32c0d0fc33ad720d2180432e910baf7a

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

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

@@ -986,7 +986,7 @@

     if (q == 0)

       q++;

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

-      q -= 15;

+      q -= cpi->sf.max_delta_qindex;

     if (q < *bottom_index)

       *bottom_index = q;

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

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

@@ -254,6 +254,7 @@

     sf->force_ref_frame =

         (cm->current_video_frame %

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

+    sf->max_delta_qindex = 15;

     sf->partition_search_type = REFERENCE_PARTITION;

     sf->use_nonrd_pick_mode = 1;

     sf->search_method = FAST_DIAMOND;

@@ -307,6 +308,7 @@

   sf->disable_split_mask = 0;

   sf->mode_search_skip_flags = 0;

   sf->force_ref_frame = 0;

+  sf->max_delta_qindex = 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

@@ -256,6 +256,9 @@

   // partition type search.

   int force_ref_frame;

+  // Maximally allowed base quantization index fluctuation.

+  int max_delta_qindex;

+

   // Implements various heuristics to skip searching modes

   // The heuristics selected are based on  flags

   // defined in the MODE_SEARCH_SKIP_HEURISTICS enum