shithub: libvpx

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ref: 9868499e4b6a2f986017c62a5adc6f1933fe992f
parent: 740083a97bb3ef0a11e45977611402a047099cfb
author: Jingning Han <[email protected]>
date: Mon Sep 10 07:55:10 EDT 2018

Rework two_pass_first_group_inter()

This function is used to in part decide if to trigger recode loop
for the first normal P frame in a GOP. Rework its design logic to
support the GOP with multi-layer ARF. Allow recode when there is
a transition from ARF/OVERLAY/USE_BUF to normal P frame.

The overall coding performance for multi-ARF gets slightly better
(less than 0.1% for show_existing_frame case). Tested on a few
clips, the encoding speed remains similar too. This change primarily
serves to help integration of multi-layer ARF and dual-ARF systems.

Change-Id: Ia44e44526b05029b1546985b3eb649e767d5444f

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -2921,9 +2921,12 @@

 static int two_pass_first_group_inter(VP9_COMP *cpi) {

   TWO_PASS *const twopass = &cpi->twopass;

   GF_GROUP *const gf_group = &twopass->gf_group;

-  if ((cpi->oxcf.pass == 2) &&

-      (gf_group->index == gf_group->first_inter_index)) {

-    return 1;

+  const int gfg_index = gf_group->index;

+

+  if (cpi->oxcf.pass == 2) {

+    if (gfg_index == 0) return gf_group->update_type[gfg_index] == LF_UPDATE;

+    return gf_group->update_type[gfg_index - 1] != LF_UPDATE &&

+           gf_group->update_type[gfg_index] == LF_UPDATE;

   } else {

     return 0;

   }