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 "ConfigManager.h" 21 #include "EvsStats.h" 22 #include "RenderBase.h" 23 #include "StreamHandler.h" 24 25 #include <aidl/android/hardware/automotive/vehicle/VehiclePropValues.h> 26 #include <android/hardware/automotive/evs/1.1/IEvsCamera.h> 27 #include <android/hardware/automotive/evs/1.1/IEvsDisplay.h> 28 #include <android/hardware/automotive/evs/1.1/IEvsEnumerator.h> 29 30 #include <IVhalClient.h> 31 32 #include <thread> 33 34 using namespace ::android::hardware::automotive::evs::V1_1; 35 using ::android::hardware::Return; 36 using ::android::hardware::Void; 37 using ::android::hardware::hidl_vec; 38 using ::android::hardware::hidl_handle; 39 using ::android::sp; 40 using ::android::wp; 41 using ::android::hardware::automotive::evs::V1_1::IEvsDisplay; 42 using ::android::hardware::camera::device::V3_2::Stream; 43 44 45 /* 46 * This class runs the main update loop for the EVS application. It will sleep when it has 47 * nothing to do. It provides a thread safe way for other threads to wake it and pass commands 48 * to it. 49 */ 50 class EvsStateControl { 51 public: 52 EvsStateControl(std::shared_ptr<android::frameworks::automotive::vhal::IVhalClient> pVnet, 53 android::sp<IEvsEnumerator> pEvs, android::sp<IEvsDisplay> pDisplay, 54 const ConfigManager& config); 55 56 enum State { 57 OFF = 0, 58 REVERSE, 59 LEFT, 60 RIGHT, 61 PARKING, 62 NUM_STATES // Must come last 63 }; 64 65 enum class Op { 66 EXIT, 67 CHECK_VEHICLE_STATE, 68 TOUCH_EVENT, 69 }; 70 71 struct Command { 72 Op operation; 73 uint32_t arg1; 74 uint32_t arg2; 75 }; 76 77 // This spawns a new thread that is expected to run continuously 78 bool startUpdateLoop(); 79 80 // This stops a rendering thread 81 void terminateUpdateLoop(); 82 83 // Safe to be called from other threads 84 void postCommand(const Command& cmd, bool clear = false); 85 86 private: 87 void updateLoop(); 88 aidl::android::hardware::automotive::vehicle::StatusCode invokeGet( 89 aidl::android::hardware::automotive::vehicle::VehiclePropValue* pRequestedPropValue); 90 bool selectStateForCurrentConditions(); 91 bool configureEvsPipeline(State desiredState); // Only call from one thread! 92 93 std::shared_ptr<android::frameworks::automotive::vhal::IVhalClient> mVehicle; 94 sp<IEvsEnumerator> mEvs; 95 wp<IEvsDisplay> mDisplay; 96 const ConfigManager& mConfig; 97 98 aidl::android::hardware::automotive::vehicle::VehiclePropValue mGearValue; 99 aidl::android::hardware::automotive::vehicle::VehiclePropValue mTurnSignalValue; 100 101 State mCurrentState = OFF; 102 103 // mCameraList is a redundant storage for camera device info, which is also 104 // stored in mCameraDescList and, however, not removed for backward 105 // compatibility. 106 std::vector<ConfigManager::CameraInfo> mCameraList[NUM_STATES]; 107 std::unique_ptr<RenderBase> mCurrentRenderer; 108 std::unique_ptr<RenderBase> mDesiredRenderer; 109 std::vector<CameraDesc> mCameraDescList[NUM_STATES]; 110 111 std::thread mRenderThread; // The thread that runs the main rendering loop 112 113 // Other threads may want to spur us into action, so we provide a thread safe way to do that 114 std::mutex mLock; 115 std::condition_variable mWakeSignal; 116 std::queue<Command> mCommandQueue; 117 118 EvsStats mEvsStats; // Not thread-safe 119 120 // True if the first frame displayed on the mCurrentRenderer. Resets to false when 121 // mCurrentRenderer changes. 122 bool mFirstFrameIsDisplayed; 123 }; 124 125 126 #endif //CAR_EVS_APP_EVSSTATECONTROL_H 127