shithub: libvpx

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Adjust key frame quantization index for rtc coding

This commit slightly increases the bit allocation for key frame. This
improves speed -5 coding performance by 2.77% with aq-mode=0 and by
2.78% with aq-mode=3.

Change-Id: Iaa3e777f80b9706306606af06e89852bac146659

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

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

@@ -244,10 +244,10 @@

     sf->min_partition_size = BLOCK_8X8;

     sf->partition_check =

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

-    sf->force_ref_frame =

+    sf->force_ref_frame = cm->frame_type == KEY_FRAME ||

         (cm->current_video_frame %

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

-    sf->max_delta_qindex = 15;

+    sf->max_delta_qindex = (cm->frame_type == KEY_FRAME) ? 20 : 15;

     sf->partition_search_type = REFERENCE_PARTITION;

     sf->use_nonrd_pick_mode = 1;

     sf->search_method = FAST_DIAMOND;