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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef CAR_EVS_APP_EVSSTATECONTROL_H
     18 #define CAR_EVS_APP_EVSSTATECONTROL_H
     19 
     20 #include "StreamHandler.h"
     21 #include "ConfigManager.h"
     22 #include "RenderBase.h"
     23 
     24 #include <android/hardware/automotive/vehicle/2.0/IVehicle.h>
     25 #include <android/hardware/automotive/evs/1.0/IEvsEnumerator.h>
     26 #include <android/hardware/automotive/evs/1.0/IEvsDisplay.h>
     27 #include <android/hardware/automotive/evs/1.0/IEvsCamera.h>
     28 
     29 #include <thread>
     30 
     31 
     32 using namespace ::android::hardware::automotive::evs::V1_0;
     33 using namespace ::android::hardware::automotive::vehicle::V2_0;
     34 using ::android::hardware::Return;
     35 using ::android::hardware::Void;
     36 using ::android::hardware::hidl_vec;
     37 using ::android::hardware::hidl_handle;
     38 using ::android::sp;
     39 
     40 
     41 /*
     42  * This class runs the main update loop for the EVS application.  It will sleep when it has
     43  * nothing to do.  It provides a thread safe way for other threads to wake it and pass commands
     44  * to it.
     45  */
     46 class EvsStateControl {
     47 public:
     48     EvsStateControl(android::sp <IVehicle>       pVnet,
     49                     android::sp <IEvsEnumerator> pEvs,
     50                     android::sp <IEvsDisplay>    pDisplay,
     51                     const ConfigManager&         config);
     52 
     53     enum State {
     54         OFF = 0,
     55         REVERSE,
     56         LEFT,
     57         RIGHT,
     58         PARKING,
     59         NUM_STATES  // Must come last
     60     };
     61 
     62     enum class Op {
     63         EXIT,
     64         CHECK_VEHICLE_STATE,
     65         TOUCH_EVENT,
     66     };
     67 
     68     struct Command {
     69         Op          operation;
     70         uint32_t    arg1;
     71         uint32_t    arg2;
     72     };
     73 
     74     // This spawns a new thread that is expected to run continuously
     75     bool startUpdateLoop();
     76 
     77     // Safe to be called from other threads
     78     void postCommand(const Command& cmd);
     79 
     80 private:
     81     void updateLoop();
     82     StatusCode invokeGet(VehiclePropValue *pRequestedPropValue);
     83     bool selectStateForCurrentConditions();
     84     bool configureEvsPipeline(State desiredState);  // Only call from one thread!
     85 
     86     sp<IVehicle>                mVehicle;
     87     sp<IEvsEnumerator>          mEvs;
     88     sp<IEvsDisplay>             mDisplay;
     89     const ConfigManager&        mConfig;
     90 
     91     VehiclePropValue            mGearValue;
     92     VehiclePropValue            mTurnSignalValue;
     93 
     94     State                       mCurrentState = OFF;
     95 
     96     std::vector<ConfigManager::CameraInfo>  mCameraList[NUM_STATES];
     97     std::unique_ptr<RenderBase> mCurrentRenderer;
     98 
     99     std::thread                 mRenderThread;  // The thread that runs the main rendering loop
    100 
    101     // Other threads may want to spur us into action, so we provide a thread safe way to do that
    102     std::mutex                  mLock;
    103     std::condition_variable     mWakeSignal;
    104     std::queue<Command>         mCommandQueue;
    105 };
    106 
    107 
    108 #endif //CAR_EVS_APP_EVSSTATECONTROL_H
    109