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/*
* Copyright (C) 2016 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 CAR_EVS_APP_EVSSTATECONTROL_H
#define CAR_EVS_APP_EVSSTATECONTROL_H
#include "StreamHandler.h"
#include "ConfigManager.h"
#include "RenderBase.h"
#include <android/hardware/automotive/vehicle/2.0/IVehicle.h>
#include <android/hardware/automotive/evs/1.0/IEvsEnumerator.h>
#include <android/hardware/automotive/evs/1.0/IEvsDisplay.h>
#include <android/hardware/automotive/evs/1.0/IEvsCamera.h>
#include <thread>
using namespace ::android::hardware::automotive::evs::V1_0;
using namespace ::android::hardware::automotive::vehicle::V2_0;
using ::android::hardware::Return;
using ::android::hardware::Void;
using ::android::hardware::hidl_vec;
using ::android::hardware::hidl_handle;
using ::android::sp;
/*
* This class runs the main update loop for the EVS application. It will sleep when it has
* nothing to do. It provides a thread safe way for other threads to wake it and pass commands
* to it.
*/
class EvsStateControl {
public:
EvsStateControl(android::sp <IVehicle> pVnet,
android::sp <IEvsEnumerator> pEvs,
android::sp <IEvsDisplay> pDisplay,
const ConfigManager& config);
enum State {
OFF = 0,
REVERSE,
LEFT,
RIGHT,
PARKING,
NUM_STATES // Must come last
};
enum class Op {
EXIT,
CHECK_VEHICLE_STATE,
TOUCH_EVENT,
};
struct Command {
Op operation;
uint32_t arg1;
uint32_t arg2;
};
// This spawns a new thread that is expected to run continuously
bool startUpdateLoop();
// Safe to be called from other threads
void postCommand(const Command& cmd);
private:
void updateLoop();
StatusCode invokeGet(VehiclePropValue *pRequestedPropValue);
bool selectStateForCurrentConditions();
bool configureEvsPipeline(State desiredState); // Only call from one thread!
sp<IVehicle> mVehicle;
sp<IEvsEnumerator> mEvs;
sp<IEvsDisplay> mDisplay;
const ConfigManager& mConfig;
VehiclePropValue mGearValue;
VehiclePropValue mTurnSignalValue;
State mCurrentState = OFF;
std::vector<ConfigManager::CameraInfo> mCameraList[NUM_STATES];
std::unique_ptr<RenderBase> mCurrentRenderer;
std::thread mRenderThread; // The thread that runs the main rendering loop
// Other threads may want to spur us into action, so we provide a thread safe way to do that
std::mutex mLock;
std::condition_variable mWakeSignal;
std::queue<Command> mCommandQueue;
};
#endif //CAR_EVS_APP_EVSSTATECONTROL_H
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