From 11c04c984afa0b3eea351d7cd9a62daab0ec70ea Mon Sep 17 00:00:00 2001
From: Eric Laurent <elaurent@google.com>
Date: Wed, 12 Aug 2009 05:49:58 -0700
Subject: [PATCH] Workaround for issue 2046783.

Apparently the problem is caused by the fact that A2dpAudioStreamOut::standby() calls a2dp_stop() after the headset has been powered down.
The workaround consists in indicating to A2DP audio hardware that a close request is pending and that stanby() must be bypassed.
---
 libs/audioflinger/A2dpAudioInterface.cpp | 14 ++++++++++++--
 libs/audioflinger/A2dpAudioInterface.h   |  1 +
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/libs/audioflinger/A2dpAudioInterface.cpp b/libs/audioflinger/A2dpAudioInterface.cpp
index 20db8a5ed..57a29f2dc 100644
--- a/libs/audioflinger/A2dpAudioInterface.cpp
+++ b/libs/audioflinger/A2dpAudioInterface.cpp
@@ -204,7 +204,7 @@ A2dpAudioInterface::A2dpAudioStreamOut::A2dpAudioStreamOut() :
     mFd(-1), mStandby(true), mStartCount(0), mRetryCount(0), mData(NULL),
     // assume BT enabled to start, this is safe because its only the
     // enabled->disabled transition we are worried about
-    mBluetoothEnabled(true), mDevice(0)
+    mBluetoothEnabled(true), mDevice(0), mClosing(false)
 {
     // use any address by default
     strcpy(mA2dpAddress, "00:00:00:00:00:00");
@@ -258,7 +258,7 @@ ssize_t A2dpAudioInterface::A2dpAudioStreamOut::write(const void* buffer, size_t
     size_t remaining = bytes;
     status_t status = -1;
 
-    if (!mBluetoothEnabled) {
+    if (!mBluetoothEnabled || mClosing) {
         LOGW("A2dpAudioStreamOut::write(), but bluetooth disabled");
         goto Error;
     }
@@ -307,6 +307,11 @@ status_t A2dpAudioInterface::A2dpAudioStreamOut::standby()
 {
     int result = 0;
 
+    if (mClosing) {
+        LOGV("Ignore standby, closing");
+        return result;
+    }
+
     Mutex::Autolock lock(mLock);
 
     if (!mStandby) {
@@ -335,6 +340,11 @@ status_t A2dpAudioInterface::A2dpAudioStreamOut::setParameters(const String8& ke
         }
         param.remove(key);
     }
+    key = String8("closing");
+    if (param.get(key, value) == NO_ERROR) {
+        mClosing = (value == "true");
+        param.remove(key);
+    }
     key = AudioParameter::keyRouting;
     if (param.getInt(key, device) == NO_ERROR) {
         if (AudioSystem::isA2dpDevice((AudioSystem::audio_devices)device)) {
diff --git a/libs/audioflinger/A2dpAudioInterface.h b/libs/audioflinger/A2dpAudioInterface.h
index d6709e2f1..35a6e1188 100644
--- a/libs/audioflinger/A2dpAudioInterface.h
+++ b/libs/audioflinger/A2dpAudioInterface.h
@@ -112,6 +112,7 @@ private:
                 Mutex       mLock;
                 bool        mBluetoothEnabled;
                 uint32_t    mDevice;
+                bool        mClosing;
     };
 
     friend class A2dpAudioStreamOut;