From ace82d693bf2f3f37599e861c830842bf941d9dc Mon Sep 17 00:00:00 2001
From: Pawit Pornkitprasan <p.pawit@gmail.com>
Date: Sat, 24 May 2014 10:54:32 +0700
Subject: [PATCH] mako: enable echo cancellation for voice communication

This greatly improves the quality of VoIP calls, tested on the app
"LINE". Without this, the other party will be able to hear echo
of their own voice.

Reference: http://source.android.com/devices/audio_implement.html#preprocessing

Change-Id: Id0ccb732778ecc8d4c9e140249ec230654f351cc
---
 audio_effects.conf | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/audio_effects.conf b/audio_effects.conf
index b26ce4163..486b8f794 100644
--- a/audio_effects.conf
+++ b/audio_effects.conf
@@ -144,3 +144,9 @@ effects {
 #
 # TODO: add default audio pre processor configurations after debug and tuning phase
 #
+
+pre_processing {
+  voice_communication {
+    aec {}
+  }
+}