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

5 files changed, 190 insertions, 2 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_
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
index 04e52b8..25225a8 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
@@ -24,6 +24,7 @@
 #include <media/stagefright/foundation/ADebug.h>
 #include <media/stagefright/foundation/AMessage.h>
 #include <media/stagefright/foundation/AUtils.h>
+#include <media/stagefright/foundation/AWakeLock.h>
 #include <media/stagefright/MediaErrors.h>
 #include <media/stagefright/MetaData.h>
 #include <media/stagefright/Utils.h>
@@ -87,7 +88,9 @@ NuPlayer::Renderer::Renderer(
       mCurrentOffloadInfo(AUDIO_INFO_INITIALIZER),
       mCurrentPcmInfo(AUDIO_PCMINFO_INITIALIZER),
       mTotalBuffersQueued(0),
-      mLastAudioBufferDrained(0) {
+      mLastAudioBufferDrained(0),
+      mWakeLock(new AWakeLock()) {
+
 }
 
 NuPlayer::Renderer::~Renderer() {
@@ -514,6 +517,7 @@ void NuPlayer::Renderer::onMessageReceived(const sp<AMessage> &msg) {
             }
             ALOGV("Audio Offload tear down due to pause timeout.");
             onAudioOffloadTearDown(kDueToTimeout);
+            mWakeLock->release();
             break;
         }
 
@@ -1385,6 +1389,7 @@ void NuPlayer::Renderer::onAudioOffloadTearDown(AudioOffloadTearDownReason reaso
 
 void NuPlayer::Renderer::startAudioOffloadPauseTimeout() {
     if (offloadingAudio()) {
+        mWakeLock->acquire();
         sp<AMessage> msg = new AMessage(kWhatAudioOffloadPauseTimeout, id());
         msg->setInt32("generation", mAudioOffloadPauseTimeoutGeneration);
         msg->post(kOffloadPauseMaxUs);
@@ -1393,6 +1398,7 @@ void NuPlayer::Renderer::startAudioOffloadPauseTimeout() {
 
 void NuPlayer::Renderer::cancelAudioOffloadPauseTimeout() {
     if (offloadingAudio()) {
+        mWakeLock->release(true);
         ++mAudioOffloadPauseTimeoutGeneration;
     }
 }
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.h b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.h
index 98fc44d..003d1d0 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.h
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.h
@@ -23,6 +23,7 @@
 namespace android {
 
 struct ABuffer;
+class  AWakeLock;
 struct VideoFrameScheduler;
 
 struct NuPlayer::Renderer : public AHandler {
@@ -194,6 +195,8 @@ private:
     int32_t mTotalBuffersQueued;
     int32_t mLastAudioBufferDrained;
 
+    sp<AWakeLock> mWakeLock;
+
     status_t getCurrentPositionOnLooper(int64_t *mediaUs);
     status_t getCurrentPositionOnLooper(
             int64_t *mediaUs, int64_t nowUs, bool allowPastQueuedVideo = false);
diff --git a/media/libstagefright/foundation/AWakeLock.cpp b/media/libstagefright/foundation/AWakeLock.cpp
new file mode 100644
index 0000000..88c4f6e
--- /dev/null
+++ b/media/libstagefright/foundation/AWakeLock.cpp
@@ -0,0 +1,109 @@
+/*
+ * 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.
+ */
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "AWakeLock"
+#include <utils/Log.h>
+
+#include "ADebug.h"
+#include "AWakeLock.h"
+
+#include <binder/IPCThreadState.h>
+#include <binder/IServiceManager.h>
+#include <powermanager/PowerManager.h>
+
+
+namespace android {
+
+AWakeLock::AWakeLock() :
+    mPowerManager(NULL),
+    mWakeLockToken(NULL),
+    mWakeLockCount(0),
+    mDeathRecipient(new PMDeathRecipient(this)) {}
+
+AWakeLock::~AWakeLock() {
+    if (mPowerManager != NULL) {
+        sp<IBinder> binder = mPowerManager->asBinder();
+        binder->unlinkToDeath(mDeathRecipient);
+    }
+    clearPowerManager();
+}
+
+bool AWakeLock::acquire() {
+    if (mWakeLockCount == 0) {
+        CHECK(mWakeLockToken == NULL);
+        if (mPowerManager == NULL) {
+            // use checkService() to avoid blocking if power service is not up yet
+            sp<IBinder> binder =
+                defaultServiceManager()->checkService(String16("power"));
+            if (binder == NULL) {
+                ALOGW("could not get the power manager service");
+            } else {
+                mPowerManager = interface_cast<IPowerManager>(binder);
+                binder->linkToDeath(mDeathRecipient);
+            }
+        }
+        if (mPowerManager != NULL) {
+            sp<IBinder> binder = new BBinder();
+            int64_t token = IPCThreadState::self()->clearCallingIdentity();
+            status_t status = mPowerManager->acquireWakeLock(
+                    POWERMANAGER_PARTIAL_WAKE_LOCK,
+                    binder, String16("AWakeLock"), String16("media"));
+            IPCThreadState::self()->restoreCallingIdentity(token);
+            if (status == NO_ERROR) {
+                mWakeLockToken = binder;
+                mWakeLockCount++;
+                return true;
+            }
+        }
+    } else {
+        mWakeLockCount++;
+        return true;
+    }
+    return false;
+}
+
+void AWakeLock::release(bool force) {
+    if (mWakeLockCount == 0) {
+        return;
+    }
+    if (force) {
+        // Force wakelock release below by setting reference count to 1.
+        mWakeLockCount = 1;
+    }
+    if (--mWakeLockCount == 0) {
+        CHECK(mWakeLockToken != NULL);
+        if (mPowerManager != NULL) {
+            int64_t token = IPCThreadState::self()->clearCallingIdentity();
+            mPowerManager->releaseWakeLock(mWakeLockToken, 0 /* flags */);
+            IPCThreadState::self()->restoreCallingIdentity(token);
+        }
+        mWakeLockToken.clear();
+    }
+}
+
+void AWakeLock::clearPowerManager() {
+    release(true);
+    mPowerManager.clear();
+}
+
+void AWakeLock::PMDeathRecipient::binderDied(const wp<IBinder>& who __unused) {
+    if (mWakeLock != NULL) {
+        mWakeLock->clearPowerManager();
+    }
+}
+
+}  // namespace android
diff --git a/media/libstagefright/foundation/Android.mk b/media/libstagefright/foundation/Android.mk
index c1dd6ce..08355c7 100644
--- a/media/libstagefright/foundation/Android.mk
+++ b/media/libstagefright/foundation/Android.mk
@@ -14,6 +14,7 @@ LOCAL_SRC_FILES:=                 \
     ANetworkSession.cpp           \
     AString.cpp                   \
     AStringUtils.cpp              \
+    AWakeLock.cpp                 \
     ParsedMessage.cpp             \
     base64.cpp                    \
     hexdump.cpp
@@ -25,7 +26,8 @@ LOCAL_SHARED_LIBRARIES := \
         libbinder         \
         libutils          \
         libcutils         \
-        liblog
+        liblog            \
+        libpowermanager
 
 LOCAL_CFLAGS += -Wno-multichar -Werror