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91 lines
3.5 KiB
91 lines
3.5 KiB
4 months ago
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/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef CAR_EVS_APP_EVSSTATS_H
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#define CAR_EVS_APP_EVSSTATS_H
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#include <aidl/android/frameworks/automotive/telemetry/CarData.h>
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#include <aidl/android/frameworks/automotive/telemetry/ICarTelemetry.h>
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#include <android/binder_status.h>
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#include <utils/Mutex.h>
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#include <deque>
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#include <memory>
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// Performs metric computations, sends to `ICarTelemetry`.
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//
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// Not thread-safe. Methods `startComputingFirstFrameLatency`, `finishComputingFirstFrameLatency`
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// and `sendCollectedDataBlocking` must be called from the same thread.
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class EvsStats {
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public:
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// Instantiates EvsStats.
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static EvsStats build();
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// Starts computing end-2-end first frame latency: from the time of the event that starts the
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// camera to the time of the display of the very first frame.
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// Call this method when an event that enables the camera occurred, e.g. gear shift to REAR.
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// Param `startTimeMillis` should be `android::uptimeMillis()`.
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void startComputingFirstFrameLatency(int64_t startTimeMillis);
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// Computes the latency and sends the data to `ICarTelemetry` if the receiving service is up.
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// Call this method when the first camera frame is displayed on the screen and don't call
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// after that unless a new computation is started.
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// Param `finishTimeMillis` should be `android::uptimeMillis()`.
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void finishComputingFirstFrameLatency(int64_t finishTimeMillis);
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// Sends the collected data to `ICarTelemetry`. Blocks for short amount of time if the service
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// is unavailable.
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void sendCollectedDataBlocking();
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private:
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enum EvsStatsState {
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NOT_STARTED = -1,
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};
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private:
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EvsStats(bool enabled) :
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mEnabled(enabled),
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mBinderDeathRecipient(::AIBinder_DeathRecipient_new(EvsStats::telemetryBinderDied)) {}
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// Death recipient callback that is called when ICarTelemetry dies.
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// The cookie is a pointer to a EvsStats object.
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static void telemetryBinderDied(void* cookie);
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void telemetryBinderDiedImpl();
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// Tries sending data if the receiving service is up.
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// Must be called when both `mEnabled` is true and `mCollectedData` is not empty.
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//
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// \param waitIfNotReady - if true, it can block briefly until ICarTelemetry is ready.
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void sendCollectedDataUnsafe(bool waitIfNotReady);
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// Returns the instance of ICarTelemetry.
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//
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// \param waitIfNotReady - if true, it can block briefly until ICarTelemetry is ready.
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std::shared_ptr<aidl::android::frameworks::automotive::telemetry::ICarTelemetry>
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getCarTelemetry(bool waitIfNotReady);
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std::mutex mMutex;
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bool mEnabled;
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int64_t mFirstFrameLatencyStartTimeMillis = EvsStatsState::NOT_STARTED;
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// This is a ring buffer
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std::deque<aidl::android::frameworks::automotive::telemetry::CarData> mCollectedData;
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std::shared_ptr<aidl::android::frameworks::automotive::telemetry::ICarTelemetry> mCarTelemetry;
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ndk::ScopedAIBinder_DeathRecipient mBinderDeathRecipient;
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};
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#endif // CAR_EVS_APP_EVSSTATS_H
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