nuplayer: acquire wakelock during offload pause timeout

Hold a wakelock while paused in audio offload mode, until audio
teardown event is received, or pause is canceled.

Since ARM cores are sleeping, the delayed AMessage will not be
received, and the audio output driver will not be closed.
This blocks XO shutdown.

Bug: 19297092
Change-Id: I3d11fef633e3f2783f4aa31e71285e2fa09d234c

1 files changed, 68 insertions, 0 deletions

diff --git a/include/media/stagefright/foundation/AWakeLock.h b/include/media/stagefright/foundation/AWakeLock.h
new file mode 100644
index 0000000..57716c1
--- /dev/null
+++ b/include/media/stagefright/foundation/AWakeLock.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef A_WAKELOCK_H_
+#define A_WAKELOCK_H_
+
+#include <media/stagefright/foundation/ABase.h>
+#include <powermanager/IPowerManager.h>
+#include <utils/RefBase.h>
+
+namespace android {
+
+class AWakeLock : public RefBase {
+
+public:
+    AWakeLock();
+
+    // NOTE: acquire and release are not thread safe
+
+    // returns true if wakelock was acquired
+    bool acquire();
+    void release(bool force = false);
+
+    virtual ~AWakeLock();
+
+private:
+    sp<IPowerManager> mPowerManager;
+    sp<IBinder>       mWakeLockToken;
+    uint32_t          mWakeLockCount;
+
+    class PMDeathRecipient : public IBinder::DeathRecipient {
+    public:
+        PMDeathRecipient(AWakeLock *wakeLock) : mWakeLock(wakeLock) {}
+        virtual ~PMDeathRecipient() {}
+
+        // IBinder::DeathRecipient
+        virtual void binderDied(const wp<IBinder> &who);
+
+    private:
+        PMDeathRecipient(const PMDeathRecipient&);
+        PMDeathRecipient& operator= (const PMDeathRecipient&);
+
+        AWakeLock *mWakeLock;
+    };
+
+    const sp<PMDeathRecipient> mDeathRecipient;
+
+    void clearPowerManager();
+
+    DISALLOW_EVIL_CONSTRUCTORS(AWakeLock);
+};
+
+}  // namespace android
+
+#endif  // A_WAKELOCK_H_