shithub: libvpx

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Add fast-adapt mechanism for VNR

Change-Id: Ia1d9cde418cc981ee08dc94a2e375d6cb4542250

--- a/vp9/encoder/vp9_noise_estimate.c

+++ b/vp9/encoder/vp9_noise_estimate.c

@@ -46,6 +46,7 @@

     ne->thresh = 115;

   }

   ne->num_frames_estimate = 15;

+  ne->adapt_thresh = (3 * ne->thresh) >> 1;

 }

 static int enable_noise_estimation(VP9_COMP *const cpi) {

@@ -277,7 +278,12 @@

     // Scale by 40 to work with existing thresholds

     ne->value = (int)((3 * ne->value + max_bin * 40) >> 2);

-    ne->count++;

+    // Quickly increase VNR strength when the noise level increases suddenly.

+    if (ne->level < kMedium && ne->value > ne->adapt_thresh) {

+      ne->count = ne->num_frames_estimate;

+    } else {

+      ne->count++;

+    }

     if (ne->count == ne->num_frames_estimate) {

       // Reset counter and check noise level condition.

       ne->num_frames_estimate = 30;

--- a/vp9/encoder/vp9_noise_estimate.h

+++ b/vp9/encoder/vp9_noise_estimate.h

@@ -32,6 +32,7 @@

   NOISE_LEVEL level;

   int value;

   int thresh;

+  int adapt_thresh;

   int count;

   int last_w;

   int last_h;