Track camera and flashlight usage in battery stats.
Bug: 15986092
Change-Id: I9dc6828332e4091fd93bf2d82839e8e3862a2fc2
diff --git a/media/utils/Android.mk b/media/utils/Android.mk
new file mode 100644
index 0000000..dfadbc80
--- /dev/null
+++ b/media/utils/Android.mk
@@ -0,0 +1,39 @@
+# Copyright 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.
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := \
+ BatteryNotifier.cpp \
+
+LOCAL_SHARED_LIBRARIES := \
+ libbinder \
+ libcutils \
+ liblog \
+ libutils \
+
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
+
+LOCAL_CFLAGS += \
+ -Wall \
+ -Wextra \
+ -Werror \
+
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
+
+LOCAL_MODULE := libmediautils
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/media/utils/BatteryNotifier.cpp b/media/utils/BatteryNotifier.cpp
new file mode 100644
index 0000000..7f9cd7a
--- /dev/null
+++ b/media/utils/BatteryNotifier.cpp
@@ -0,0 +1,213 @@
+/*
+ * Copyright 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.
+ */
+
+#include "include/mediautils/BatteryNotifier.h"
+
+#include <binder/IServiceManager.h>
+#include <utils/Log.h>
+#include <private/android_filesystem_config.h>
+
+namespace android {
+
+void BatteryNotifier::DeathNotifier::binderDied(const wp<IBinder>& /*who*/) {
+ BatteryNotifier::getInstance().onBatteryStatServiceDied();
+}
+
+BatteryNotifier::BatteryNotifier() : mVideoRefCount(0), mAudioRefCount(0) {}
+
+BatteryNotifier::~BatteryNotifier() {
+ Mutex::Autolock _l(mLock);
+ if (mDeathNotifier != nullptr) {
+ IInterface::asBinder(mBatteryStatService)->unlinkToDeath(mDeathNotifier);
+ }
+}
+
+void BatteryNotifier::noteStartVideo() {
+ Mutex::Autolock _l(mLock);
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+ if (mVideoRefCount == 0 && batteryService != nullptr) {
+ batteryService->noteStartVideo(AID_MEDIA);
+ }
+ mVideoRefCount++;
+}
+
+void BatteryNotifier::noteStopVideo() {
+ Mutex::Autolock _l(mLock);
+ if (mVideoRefCount == 0) {
+ ALOGW("%s: video refcount is broken.", __FUNCTION__);
+ return;
+ }
+
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+
+ mVideoRefCount--;
+ if (mVideoRefCount == 0 && batteryService != nullptr) {
+ batteryService->noteStopVideo(AID_MEDIA);
+ }
+}
+
+void BatteryNotifier::noteResetVideo() {
+ Mutex::Autolock _l(mLock);
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+ mVideoRefCount = 0;
+ if (batteryService != nullptr) {
+ batteryService->noteResetAudio();
+ }
+}
+
+void BatteryNotifier::noteStartAudio() {
+ Mutex::Autolock _l(mLock);
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+ if (mAudioRefCount == 0 && batteryService != nullptr) {
+ batteryService->noteStartAudio(AID_MEDIA);
+ }
+ mAudioRefCount++;
+}
+
+void BatteryNotifier::noteStopAudio() {
+ Mutex::Autolock _l(mLock);
+ if (mAudioRefCount == 0) {
+ ALOGW("%s: audio refcount is broken.", __FUNCTION__);
+ return;
+ }
+
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+
+ mAudioRefCount--;
+ if (mAudioRefCount == 0 && batteryService != nullptr) {
+ batteryService->noteStopAudio(AID_MEDIA);
+ }
+}
+
+void BatteryNotifier::noteResetAudio() {
+ Mutex::Autolock _l(mLock);
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+ mAudioRefCount = 0;
+ if (batteryService != nullptr) {
+ batteryService->noteResetAudio();
+ }
+}
+
+void BatteryNotifier::noteFlashlightOn(const String8& id, int uid) {
+ Mutex::Autolock _l(mLock);
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+
+ std::pair<String8, int> k = std::make_pair(id, uid);
+ if (!mFlashlightState[k]) {
+ mFlashlightState[k] = true;
+ if (batteryService != nullptr) {
+ batteryService->noteFlashlightOn(uid);
+ }
+ }
+}
+
+void BatteryNotifier::noteFlashlightOff(const String8& id, int uid) {
+ Mutex::Autolock _l(mLock);
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+
+ std::pair<String8, int> k = std::make_pair(id, uid);
+ if (mFlashlightState[k]) {
+ mFlashlightState[k] = false;
+ if (batteryService != nullptr) {
+ batteryService->noteFlashlightOff(uid);
+ }
+ }
+}
+
+void BatteryNotifier::noteResetFlashlight() {
+ Mutex::Autolock _l(mLock);
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+ mFlashlightState.clear();
+ if (batteryService != nullptr) {
+ batteryService->noteResetFlashlight();
+ }
+}
+
+void BatteryNotifier::noteStartCamera(const String8& id, int uid) {
+ Mutex::Autolock _l(mLock);
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+ std::pair<String8, int> k = std::make_pair(id, uid);
+ if (!mCameraState[k]) {
+ mCameraState[k] = true;
+ if (batteryService != nullptr) {
+ batteryService->noteStartCamera(uid);
+ }
+ }
+}
+
+void BatteryNotifier::noteStopCamera(const String8& id, int uid) {
+ Mutex::Autolock _l(mLock);
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+ std::pair<String8, int> k = std::make_pair(id, uid);
+ if (mCameraState[k]) {
+ mCameraState[k] = false;
+ if (batteryService != nullptr) {
+ batteryService->noteStopCamera(uid);
+ }
+ }
+}
+
+void BatteryNotifier::noteResetCamera() {
+ Mutex::Autolock _l(mLock);
+ sp<IBatteryStats> batteryService = getBatteryService_l();
+ mCameraState.clear();
+ if (batteryService != nullptr) {
+ batteryService->noteResetCamera();
+ }
+}
+
+void BatteryNotifier::onBatteryStatServiceDied() {
+ Mutex::Autolock _l(mLock);
+ mBatteryStatService.clear();
+ mDeathNotifier.clear();
+ // Do not reset mVideoRefCount and mAudioRefCount here. The ref
+ // counting is independent of the battery service availability.
+ // We need this if battery service becomes available after media
+ // started.
+
+}
+
+sp<IBatteryStats> BatteryNotifier::getBatteryService_l() {
+ if (mBatteryStatService != nullptr) {
+ return mBatteryStatService;
+ }
+ // Get battery service from service manager
+ const sp<IServiceManager> sm(defaultServiceManager());
+ if (sm != nullptr) {
+ const String16 name("batterystats");
+ mBatteryStatService = interface_cast<IBatteryStats>(sm->checkService(name));
+ if (mBatteryStatService == nullptr) {
+ ALOGE("batterystats service unavailable!");
+ return nullptr;
+ }
+
+ mDeathNotifier = new DeathNotifier();
+ IInterface::asBinder(mBatteryStatService)->linkToDeath(mDeathNotifier);
+
+ // Notify start now if media already started
+ if (mVideoRefCount > 0) {
+ mBatteryStatService->noteStartVideo(AID_MEDIA);
+ }
+ if (mAudioRefCount > 0) {
+ mBatteryStatService->noteStartAudio(AID_MEDIA);
+ }
+ }
+ return mBatteryStatService;
+}
+
+ANDROID_SINGLETON_STATIC_INSTANCE(BatteryNotifier);
+
+} // namespace android
diff --git a/media/utils/README b/media/utils/README
new file mode 100644
index 0000000..65ab0b8
--- /dev/null
+++ b/media/utils/README
@@ -0,0 +1,4 @@
+This is a common shared library for media utility classes.
+
+Consider adding your utility class/function here if it will
+be used across several of the media libraries.
diff --git a/media/utils/include/mediautils/BatteryNotifier.h b/media/utils/include/mediautils/BatteryNotifier.h
new file mode 100644
index 0000000..49048042
--- /dev/null
+++ b/media/utils/include/mediautils/BatteryNotifier.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright 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 MEDIA_BATTERY_NOTIFIER_H
+#define MEDIA_BATTERY_NOTIFIER_H
+
+#include <binder/IBatteryStats.h>
+#include <utils/Singleton.h>
+#include <utils/String8.h>
+
+#include <map>
+#include <utility>
+
+namespace android {
+
+/**
+ * Class used for logging battery life events in mediaserver.
+ */
+class BatteryNotifier : public Singleton<BatteryNotifier> {
+
+ friend class Singleton<BatteryNotifier>;
+ BatteryNotifier();
+
+public:
+ ~BatteryNotifier();
+
+ void noteStartVideo();
+ void noteStopVideo();
+ void noteResetVideo();
+ void noteStartAudio();
+ void noteStopAudio();
+ void noteResetAudio();
+ void noteFlashlightOn(const String8& id, int uid);
+ void noteFlashlightOff(const String8& id, int uid);
+ void noteResetFlashlight();
+ void noteStartCamera(const String8& id, int uid);
+ void noteStopCamera(const String8& id, int uid);
+ void noteResetCamera();
+
+private:
+ void onBatteryStatServiceDied();
+
+ class DeathNotifier : public IBinder::DeathRecipient {
+ virtual void binderDied(const wp<IBinder>& /*who*/);
+ };
+
+ Mutex mLock;
+ int mVideoRefCount;
+ int mAudioRefCount;
+ std::map<std::pair<String8, int>, bool> mFlashlightState;
+ std::map<std::pair<String8, int>, bool> mCameraState;
+ sp<IBatteryStats> mBatteryStatService;
+ sp<DeathNotifier> mDeathNotifier;
+
+ sp<IBatteryStats> getBatteryService_l();
+};
+
+} // namespace android
+
+#endif // MEDIA_BATTERY_NOTIFIER_H