From c9bc0433a0aa2a43c657b6af3aaafe3340aa7248 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jerzy=20G=C5=82owacki?= <jerzy.glowacki@nexocode.com>
Date: Tue, 14 Apr 2020 20:45:24 +0200
Subject: [PATCH] Add Acoustic EchoCanceler, Automatic Gain Control and Noise
 Suppressor if available

---
 .../java/se/lublin/humla/audio/AudioInput.java  | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/main/java/se/lublin/humla/audio/AudioInput.java b/src/main/java/se/lublin/humla/audio/AudioInput.java
index 07fdd76..dd7969c 100644
--- a/src/main/java/se/lublin/humla/audio/AudioInput.java
+++ b/src/main/java/se/lublin/humla/audio/AudioInput.java
@@ -19,6 +19,10 @@ package se.lublin.humla.audio;
 
 import android.media.AudioFormat;
 import android.media.AudioRecord;
+import android.media.audiofx.AcousticEchoCanceler;
+import android.media.audiofx.AutomaticGainControl;
+import android.media.audiofx.NoiseSuppressor;
+import android.os.Build;
 import android.util.Log;
 
 import se.lublin.humla.Constants;
@@ -86,6 +90,19 @@ public class AudioInput implements Runnable {
             throw new AudioInitializationException("AudioRecord failed to initialize!");
         }
 
+        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
+            int audioSessionId = audioRecord.getAudioSessionId();
+            if(AcousticEchoCanceler.isAvailable()) {
+                AcousticEchoCanceler.create(audioSessionId);
+            }
+            if(AutomaticGainControl.isAvailable()) {
+                AutomaticGainControl.create(audioSessionId);
+            }
+            if(NoiseSuppressor.isAvailable()) {
+                NoiseSuppressor.create(audioSessionId);
+            }
+        }
+
         return audioRecord;
     }
 
-- 
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