From 3edc7f05f5a6d94b8ea2d29faa5ed65ae0a226d8 Mon Sep 17 00:00:00 2001
From: "henrik.lundin" <henrik.lundin@webrtc.org>
Date: Thu, 24 Nov 2016 01:42:46 -0800
Subject: [PATCH] AGC: Add a histogram for new level

The histogram will log a new value every time the AGC changes level_.

BUG=webrtc:6622

Review-Url: https://codereview.webrtc.org/2525963002
Cr-Commit-Position: refs/heads/master@{#15222}
---
 webrtc/modules/audio_processing/agc/agc_manager_direct.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/webrtc/modules/audio_processing/agc/agc_manager_direct.cc b/webrtc/modules/audio_processing/agc/agc_manager_direct.cc
index dc9ba42d51..f8fc310c57 100644
--- a/webrtc/modules/audio_processing/agc/agc_manager_direct.cc
+++ b/webrtc/modules/audio_processing/agc/agc_manager_direct.cc
@@ -407,7 +407,12 @@ void AgcManagerDirect::UpdateGain() {
   if (residual_gain == 0)
     return;
 
+  int old_level = level_;
   SetLevel(LevelFromGainError(residual_gain, level_));
+  if (old_level != level_) {
+    // level_ was updated by SetLevel; log the new value.
+    RTC_HISTOGRAM_ENUMERATION("WebRTC.Audio.AgcLevel", level_, kMaxMicLevel);
+  }
 }
 
 void AgcManagerDirect::UpdateCompressor() {