From 768b1f72814a6f96f070ff2c4bee3419b1973ee8 Mon Sep 17 00:00:00 2001
From: Marco <marpan@google.com>
Date: Tue, 3 Jan 2017 16:01:05 -0800
Subject: [PATCH] vp9: 1 pass cbr: allow noise estimation down to 360p.

Also adjust some thresholds for noise level setting.

Change-Id: I7e03d7057ef2061c9447728deb9c6aff5d3da4b7
---
 vp9/encoder/vp9_encodeframe.c    | 4 ++--
 vp9/encoder/vp9_noise_estimate.c | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/vp9/encoder/vp9_encodeframe.c b/vp9/encoder/vp9_encodeframe.c
index 780d985..e622f2c 100644
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -477,8 +477,8 @@ static void set_vbp_thresholds(VP9_COMP *cpi, int64_t thresholds[], int q) {
     thresholds[2] = threshold_base >> 2;
     thresholds[3] = threshold_base << 2;
   } else {
-    // Increase base variance threshold based on  estimated noise level.
-    if (cpi->noise_estimate.enabled) {
+    // Increase base variance threshold based on estimated noise level.
+    if (cpi->noise_estimate.enabled && cm->width >= 640 && cm->height >= 480) {
       NOISE_LEVEL noise_level =
           vp9_noise_estimate_extract_level(&cpi->noise_estimate);
       if (noise_level == kHigh)
diff --git a/vp9/encoder/vp9_noise_estimate.c b/vp9/encoder/vp9_noise_estimate.c
index caf48d8..2252fe1 100644
--- a/vp9/encoder/vp9_noise_estimate.c
+++ b/vp9/encoder/vp9_noise_estimate.c
@@ -26,13 +26,13 @@ void vp9_noise_estimate_init(NOISE_ESTIMATE *const ne, int width, int height) {
   ne->level = kLowLow;
   ne->value = 0;
   ne->count = 0;
-  ne->thresh = 90;
+  ne->thresh = 100;
   ne->last_w = 0;
   ne->last_h = 0;
   if (width * height >= 1920 * 1080) {
     ne->thresh = 200;
   } else if (width * height >= 1280 * 720) {
-    ne->thresh = 130;
+    ne->thresh = 140;
   }
   ne->num_frames_estimate = 20;
 }
@@ -52,7 +52,7 @@ static int enable_noise_estimation(VP9_COMP *const cpi) {
       cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->oxcf.speed >= 5 &&
       cpi->resize_state == ORIG && cpi->resize_pending == 0 && !cpi->use_svc &&
       cpi->oxcf.content != VP9E_CONTENT_SCREEN && cpi->common.width >= 640 &&
-      cpi->common.height >= 480)
+      cpi->common.height >= 360)
     return 1;
   else
     return 0;
-- 
2.7.4