Enable AEC and AGC

Signed-off-by: Leo Ma <begeekmyfriend@gmail.com>

library/src/main/java/net/ossrs/yasea/SrsPublisher.java

@@ -3,19 +3,22 @@ package net.ossrs.yasea;
 import android.content.Context;
 import android.media.AudioManager;
 import android.media.AudioRecord;
+import android.media.audiofx.AcousticEchoCanceler;
+import android.media.audiofx.AutomaticGainControl;
 
 import com.github.faucamp.simplertmp.RtmpHandler;
 import com.seu.magicfilter.utils.MagicFilterType;
 
 import java.io.File;
-import java.io.IOException;
 
 /**
  * Created by Leo Ma on 2016/7/25.
  */
 public class SrsPublisher {
 
-    private AudioRecord mic;
+    private static AudioRecord mic;
+    private static AcousticEchoCanceler aec;
+    private static AutomaticGainControl agc;
     private boolean aloop = false;
     private Thread aworker;
 
@@ -67,6 +70,20 @@ public class SrsPublisher {
             return;
         }
 
+        if (AcousticEchoCanceler.isAvailable()) {
+            aec = AcousticEchoCanceler.create(mic.getAudioSessionId());
+            if (aec != null) {
+                aec.setEnabled(true);
+            }
+        }
+
+        if (AutomaticGainControl.isAvailable()) {
+            agc = AutomaticGainControl.create(mic.getAudioSessionId());
+            if (agc != null) {
+                agc.setEnabled(true);
+            }
+        }
+
         if (!mCameraView.startCamera()) {
             mEncoder.stop();
             return;
@@ -237,6 +254,18 @@ public class SrsPublisher {
             mic.release();
             mic = null;
         }
+
+        if (aec != null) {
+            aec.setEnabled(false);
+            aec.release();
+            aec = null;
+        }
+
+        if (agc != null) {
+            agc.setEnabled(false);
+            agc.release();
+            agc = null;
+        }
     }
 
     public void switchMute() {