services/mediametrics/AudioAnalytics.h - platform/frameworks/av - Git at Google

 /*
  * Copyright (C) 2019 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.
  */

 #pragma once

 #include <android-base/thread_annotations.h>
 #include <audio_utils/SimpleLog.h>
 #include "AnalyticsActions.h"
 #include "AnalyticsState.h"
 #include "AudioPowerUsage.h"
 #include "TimedAction.h"
 #include "Wrap.h"

 namespace android::mediametrics {

 class AudioAnalytics
 {
     // AudioAnalytics action / state helper classes
     friend AudioPowerUsage;

 public:
     AudioAnalytics();
     ~AudioAnalytics();

     /**
      * Returns success if AudioAnalytics recognizes item.
      *
      * AudioAnalytics requires the item key to start with "audio.".
      *
      * A trusted source can create a new key, an untrusted source
      * can only modify the key if the uid will match that authorized
      * on the existing key.
      *
      * \param item the item to be submitted.
      * \param isTrusted whether the transaction comes from a trusted source.
      *        In this case, a trusted source is verified by binder
      *        UID to be a system service by MediaMetrics service.
      *        Do not use true if you haven't really checked!
      *
      * \return NO_ERROR on success,
      *         PERMISSION_DENIED if the item cannot be put into the AnalyticsState,
      *         BAD_VALUE if the item key does not start with "audio.".
      */
     status_t submit(const std::shared_ptr<const mediametrics::Item>& item, bool isTrusted);

     /**
      * Returns a pair consisting of the dump string, and the number of lines in the string.
      *
      * The number of lines in the returned pair is used as an optimization
      * for subsequent line limiting.
      *
      * The TimeMachine and the TransactionLog are dumped separately under
      * different locks, so may not be 100% consistent with the last data
      * delivered.
      *
      * \param lines the maximum number of lines in the string returned.
      * \param sinceNs the nanoseconds since Unix epoch to start dump (0 shows all)
      * \param prefix the desired key prefix to match (nullptr shows all)
      */
     std::pair<std::string, int32_t> dump(
             int32_t lines = INT32_MAX, int64_t sinceNs = 0, const char *prefix = nullptr) const;

     void clear() {
         // underlying state is locked.
         mPreviousAnalyticsState->clear();
         mAnalyticsState->clear();

         // Clear power usage state.
         mAudioPowerUsage.clear();
     }

 private:

     /*
      * AudioAnalytics class does not contain a monitor mutex.
      * Instead, all of its variables are individually locked for access.
      * Since data and items are generally added only (gc removes it), this is a reasonable
      * compromise for availability/concurrency versus consistency.
      *
      * It is possible for concurrent threads to be reading and writing inside of AudioAnalytics.
      * Reads based on a prior time (e.g. one second) in the past from the TimeMachine can be
      * used to achieve better consistency if needed.
      */

     /**
      * Checks for any pending actions for a particular item.
      *
      * \param item to check against the current AnalyticsActions.
      */
     void checkActions(const std::shared_ptr<const mediametrics::Item>& item);

     // HELPER METHODS
     /**
      * Return the audio thread associated with an audio track name.
      * e.g. "audio.track.32" -> "audio.thread.10" if the associated
      * threadId for the audio track is 10.
      */
     std::string getThreadFromTrack(const std::string& track) const;

     const bool mDeliverStatistics;

     // Actions is individually locked
     AnalyticsActions mActions;

     // AnalyticsState is individually locked, and we use SharedPtrWrap
     // to allow safe access even if the shared pointer changes underneath.
     // These wrap pointers always point to a valid state object.
     SharedPtrWrap<AnalyticsState> mAnalyticsState;
     SharedPtrWrap<AnalyticsState> mPreviousAnalyticsState;

     TimedAction mTimedAction; // locked internally

     SimpleLog mStatsdLog{16 /* log lines */}; // locked internally

     // DeviceUse is a nested class which handles audio device usage accounting.
     // We define this class at the end to ensure prior variables all properly constructed.
     // TODO: Track / Thread interaction
     // TODO: Consider statistics aggregation.
     class DeviceUse {
     public:
         enum ItemType {
             RECORD = 0,
             THREAD = 1,
             TRACK = 2,
         };

         explicit DeviceUse(AudioAnalytics &audioAnalytics) : mAudioAnalytics{audioAnalytics} {}

         // Called every time an endAudioIntervalGroup message is received.
         void endAudioIntervalGroup(
                 const std::shared_ptr<const android::mediametrics::Item> &item,
                 ItemType itemType) const;

     private:
         AudioAnalytics &mAudioAnalytics;
     } mDeviceUse{*this};

     // DeviceConnected is a nested class which handles audio device connection
     // We define this class at the end to ensure prior variables all properly constructed.
     // TODO: Track / Thread interaction
     // TODO: Consider statistics aggregation.
     class DeviceConnection {
     public:
         explicit DeviceConnection(AudioAnalytics &audioAnalytics)
             : mAudioAnalytics{audioAnalytics} {}

         // Called every time an endAudioIntervalGroup message is received.
         void a2dpConnected(
                 const std::shared_ptr<const android::mediametrics::Item> &item);

         // Called when we have an AudioFlinger createPatch
         void createPatch(
                 const std::shared_ptr<const android::mediametrics::Item> &item);

         // Called through AudioManager when the BT service wants to notify connection
         void postBluetoothA2dpDeviceConnectionStateSuppressNoisyIntent(
                 const std::shared_ptr<const android::mediametrics::Item> &item);

         // When the timer expires.
         void expire();

     private:
         AudioAnalytics &mAudioAnalytics;

         mutable std::mutex mLock;
         std::string mA2dpDeviceName;
         int64_t mA2dpConnectionRequestNs GUARDED_BY(mLock) = 0;  // Time for BT service request.
         int64_t mA2dpConnectionServiceNs GUARDED_BY(mLock) = 0;  // Time audio service agrees.

         int32_t mA2dpConnectionRequests GUARDED_BY(mLock) = 0;
         int32_t mA2dpConnectionServices GUARDED_BY(mLock) = 0;

         // See the statsd atoms.proto
         int32_t mA2dpConnectionSuccesses GUARDED_BY(mLock) = 0;
         int32_t mA2dpConnectionJavaServiceCancels GUARDED_BY(mLock) = 0;
         int32_t mA2dpConnectionUnknowns GUARDED_BY(mLock) = 0;
     } mDeviceConnection{*this};

     AudioPowerUsage mAudioPowerUsage{this};
 };

 } // namespace android::mediametrics
	/*
	* Copyright (C) 2019 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.
	*/

	#pragma once

	#include <android-base/thread_annotations.h>
	#include <audio_utils/SimpleLog.h>
	#include "AnalyticsActions.h"
	#include "AnalyticsState.h"
	#include "AudioPowerUsage.h"
	#include "TimedAction.h"
	#include "Wrap.h"

	namespace android::mediametrics {

	class AudioAnalytics
	{
	// AudioAnalytics action / state helper classes
	friend AudioPowerUsage;

	public:
	AudioAnalytics();
	~AudioAnalytics();

	/**
	* Returns success if AudioAnalytics recognizes item.
	*
	* AudioAnalytics requires the item key to start with "audio.".
	*
	* A trusted source can create a new key, an untrusted source
	* can only modify the key if the uid will match that authorized
	* on the existing key.
	*
	* \param item the item to be submitted.
	* \param isTrusted whether the transaction comes from a trusted source.
	* In this case, a trusted source is verified by binder
	* UID to be a system service by MediaMetrics service.
	* Do not use true if you haven't really checked!
	*
	* \return NO_ERROR on success,
	* PERMISSION_DENIED if the item cannot be put into the AnalyticsState,
	* BAD_VALUE if the item key does not start with "audio.".
	*/
	status_t submit(const std::shared_ptr<const mediametrics::Item>& item, bool isTrusted);

	/**
	* Returns a pair consisting of the dump string, and the number of lines in the string.
	*
	* The number of lines in the returned pair is used as an optimization
	* for subsequent line limiting.
	*
	* The TimeMachine and the TransactionLog are dumped separately under
	* different locks, so may not be 100% consistent with the last data
	* delivered.
	*
	* \param lines the maximum number of lines in the string returned.
	* \param sinceNs the nanoseconds since Unix epoch to start dump (0 shows all)
	* \param prefix the desired key prefix to match (nullptr shows all)
	*/
	std::pair<std::string, int32_t> dump(
	int32_t lines = INT32_MAX, int64_t sinceNs = 0, const char *prefix = nullptr) const;

	void clear() {
	// underlying state is locked.
	mPreviousAnalyticsState->clear();
	mAnalyticsState->clear();

	// Clear power usage state.
	mAudioPowerUsage.clear();
	}

	private:

	/*
	* AudioAnalytics class does not contain a monitor mutex.
	* Instead, all of its variables are individually locked for access.
	* Since data and items are generally added only (gc removes it), this is a reasonable
	* compromise for availability/concurrency versus consistency.
	*
	* It is possible for concurrent threads to be reading and writing inside of AudioAnalytics.
	* Reads based on a prior time (e.g. one second) in the past from the TimeMachine can be
	* used to achieve better consistency if needed.
	*/

	/**
	* Checks for any pending actions for a particular item.
	*
	* \param item to check against the current AnalyticsActions.
	*/
	void checkActions(const std::shared_ptr<const mediametrics::Item>& item);

	// HELPER METHODS
	/**
	* Return the audio thread associated with an audio track name.
	* e.g. "audio.track.32" -> "audio.thread.10" if the associated
	* threadId for the audio track is 10.
	*/
	std::string getThreadFromTrack(const std::string& track) const;

	const bool mDeliverStatistics;

	// Actions is individually locked
	AnalyticsActions mActions;

	// AnalyticsState is individually locked, and we use SharedPtrWrap
	// to allow safe access even if the shared pointer changes underneath.
	// These wrap pointers always point to a valid state object.
	SharedPtrWrap<AnalyticsState> mAnalyticsState;
	SharedPtrWrap<AnalyticsState> mPreviousAnalyticsState;

	TimedAction mTimedAction; // locked internally

	SimpleLog mStatsdLog{16 /* log lines */}; // locked internally

	// DeviceUse is a nested class which handles audio device usage accounting.
	// We define this class at the end to ensure prior variables all properly constructed.
	// TODO: Track / Thread interaction
	// TODO: Consider statistics aggregation.
	class DeviceUse {
	public:
	enum ItemType {
	RECORD = 0,
	THREAD = 1,
	TRACK = 2,
	};

	explicit DeviceUse(AudioAnalytics &audioAnalytics) : mAudioAnalytics{audioAnalytics} {}

	// Called every time an endAudioIntervalGroup message is received.
	void endAudioIntervalGroup(
	const std::shared_ptr<const android::mediametrics::Item> &item,
	ItemType itemType) const;

	private:
	AudioAnalytics &mAudioAnalytics;
	} mDeviceUse{*this};

	// DeviceConnected is a nested class which handles audio device connection
	// We define this class at the end to ensure prior variables all properly constructed.
	// TODO: Track / Thread interaction
	// TODO: Consider statistics aggregation.
	class DeviceConnection {
	public:
	explicit DeviceConnection(AudioAnalytics &audioAnalytics)
	: mAudioAnalytics{audioAnalytics} {}

	// Called every time an endAudioIntervalGroup message is received.
	void a2dpConnected(
	const std::shared_ptr<const android::mediametrics::Item> &item);

	// Called when we have an AudioFlinger createPatch
	void createPatch(
	const std::shared_ptr<const android::mediametrics::Item> &item);

	// Called through AudioManager when the BT service wants to notify connection
	void postBluetoothA2dpDeviceConnectionStateSuppressNoisyIntent(
	const std::shared_ptr<const android::mediametrics::Item> &item);

	// When the timer expires.
	void expire();

	private:
	AudioAnalytics &mAudioAnalytics;

	mutable std::mutex mLock;
	std::string mA2dpDeviceName;
	int64_t mA2dpConnectionRequestNs GUARDED_BY(mLock) = 0; // Time for BT service request.
	int64_t mA2dpConnectionServiceNs GUARDED_BY(mLock) = 0; // Time audio service agrees.

	int32_t mA2dpConnectionRequests GUARDED_BY(mLock) = 0;
	int32_t mA2dpConnectionServices GUARDED_BY(mLock) = 0;

	// See the statsd atoms.proto
	int32_t mA2dpConnectionSuccesses GUARDED_BY(mLock) = 0;
	int32_t mA2dpConnectionJavaServiceCancels GUARDED_BY(mLock) = 0;
	int32_t mA2dpConnectionUnknowns GUARDED_BY(mLock) = 0;
	} mDeviceConnection{*this};

	AudioPowerUsage mAudioPowerUsage{this};
	};

	} // namespace android::mediametrics