From 2f4a77028dffc2312946641be87e9d6cacdecd0a Mon Sep 17 00:00:00 2001
From: Pawit Pornkitprasan <p.pawit@gmail.com>
Date: Fri, 13 Dec 2013 21:37:01 +0700
Subject: [PATCH] AudioMixer: fix artifact on 2 short sounds

On the I9082, when 2 short sounds are played simultaneously, there will be artifact
on the speaker due to the buffer not being cleared.

Change-Id: I8a325175e8e326a638c7f29987ae272ae8af6b66
---
 services/audioflinger/AudioMixer.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/services/audioflinger/AudioMixer.cpp b/services/audioflinger/AudioMixer.cpp
index 95f7381..bd40948 100644
--- a/services/audioflinger/AudioMixer.cpp
+++ b/services/audioflinger/AudioMixer.cpp
@@ -1128,8 +1128,13 @@ void AudioMixer::process__genericNoResampling(state_t* state, int64_t pts)
         t.in = t.buffer.raw;
         // t.in == NULL can happen if the track was flushed just after having
         // been enabled for mixing.
-        if (t.in == NULL)
+        if (t.in == NULL) {
             enabledTracks &= ~(1<<i);
+
+            // We need to clear buffer here or there will be strange artifact
+            // on I9082's speaker
+            memset(t.mainBuffer, 0, state->frameCount);
+        }
     }
 
     e0 = enabledTracks;
-- 
1.8.3.4 (Apple Git-47)