{"id":4219,"date":"2023-01-08T15:01:27","date_gmt":"2023-01-08T07:01:27","guid":{"rendered":"https:\/\/blog.coderfan.org\/?p=4219"},"modified":"2024-02-28T10:31:03","modified_gmt":"2024-02-28T02:31:03","slug":"android12-evs-architecture-introduce","status":"publish","type":"post","link":"https:\/\/blog.coderfan.org\/en\/android12-evs-architecture-introduce.html","title":{"rendered":"Android12 EVS\u67b6\u6784\u5168\u89e3\u4e4b\u8f6f\u4ef6\u67b6\u6784"},"content":{"rendered":"
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\n \t<\/i> Read Time:<\/span>5 Minute, 59 Second <\/div>\n\n <\/div>\n

\u5728\u5b89\u5353\u7cfb\u7edf\u4e2d\uff0c\u9488\u5bf9Camera\u7684\u5e94\u7528\u5b58\u5728\u4e24\u5957\u67b6\u6784\uff0c\u7ecf\u5e38\u505a\u624b\u673a\u5e94\u7528\u7684\u670b\u53cb\u5e94\u8be5\u77e5\u9053Camera2\u4e0e\u6700\u65b0\u63a8\u51fa\u7684CameraX\u3002\u65e0\u8bba\u662fCamera2\u8fd8\u662fCameraX\uff0c\u90fd\u4f9d\u8d56\u4e8eNative\u7684CameraService\u3002\u4f46\u662f\u9664\u4e86\u8fd9\u5957\u67b6\u6784\u5916\uff0c\u5b89\u5353\u9488\u5bf9Automotive\u7684\u7248\u672c\u8fd8\u5b58\u5728\u53e6\u5916\u4e00\u5957\u67b6\u6784\u2014\u2014EVS(Exterior View System)\u3002<\/p>\n\n\n\n

\u4eceEVS\u7684\u82f1\u6587\u5168\u79f0\u6211\u4eec\u81ea\u5df1\u53ef\u4ee5\u7406\u89e3EVS\u67b6\u6784\u7684\u4f7f\u7528\u573a\u666f\uff0c\u5373\u9488\u5bf9\u6c7d\u8f66\u5916\u666f\u7cfb\u7edf\u3002\u518d\u7b80\u5355\u76f4\u63a5\u4e00\u70b9\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u5e73\u5e38\u6240\u8bf4\u7684\u5012\u8f66\u5f71\u50cf\uff0c360\u5168\u666f\u8fd9\u4e00\u7c7b\u5f71\u50cf\u7cfb\u7edf\u3002\u5173\u4e8eEVS\u4e0eCamera2\u8fd9\u7c7b\u67b6\u6784\u7684\u533a\u522b\uff0c\u4e3b\u8981\u5305\u62ec\u5982\u4e0b\u51e0\u70b9\uff1a<\/p>\n\n\n\n

1.EVS\u67b6\u6784\u4e00\u822c\u9488\u5bf9\u8f66\u5916\u6444\u50cf\u5934\u3002\u8f66\u5916\u6444\u50cf\u5934\u4e00\u822c\u7528\u4e8e\u5012\u8f66\u5f71\u50cf\uff0c360\u5168\u666f\u73af\u89c6\u6216\u8005\u81ea\u52a8\u9a7e\u9a76\u7b49\u573a\u666f\u3002\u4e3a\u4e86\u83b7\u53d6\u66f4\u5bbd\u9614\u7684\u89c6\u91ce\uff0c\u66f4\u7a33\u5b9a\u7684\u6210\u50cf\u6548\u679c\u3002\u4e00\u822c\u800c\u8a00\uff0c\u8f66\u5916\u6444\u50cf\u5934\u7684\u4f4d\u7f6e\u90fd\u662f\u56fa\u5b9a\u7684\uff0c\u4e14\u90fd\u5c5e\u4e8e\u9c7c\u773c\u89c6\u89d2\uff0c\u5176\u4ed6\u53c2\u6570\u4e0a\u4e5f\u8f83\u4e3a\u56fa\u5b9a\u3002\u8fd9\u4e0e\u6211\u4eec\u624b\u673a\u6216\u8005\u8f66\u5185\u6444\u50cf\u5934\u90fd\u662f\u6709\u5dee\u5f02\u7684\uff0c\u56e0\u6b64\u4e5f\u6ce8\u5b9a\u4e86\u5728EVS\u67b6\u6784\u4e2d\uff0c\u7cfb\u7edf\u5bf9\u6444\u50cf\u5934\u7684\u63a7\u5236\u662f\u6bd4\u8f83\u5c11\u7684\u3002\u4e0e\u6b64\u76f8\u53cd\uff0cCamera2\u7ecf\u5e38\u7528\u4e8e\u624b\u673a\u76f8\u673a\u5e94\u7528\u6216\u8005\u8f66\u5185\u5982IMS,DMS\u7b49\u7cfb\u7edf\uff0c\u6444\u50cf\u5934\u62e5\u6709\u6bd4\u8f83\u7075\u6d3b\u7684\u8c03\u8282\u7a7a\u95f4\u4e0e\u53c2\u6570\u8bbe\u5b9a\u3002\u6545\u800cCamera2\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684API\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u6444\u50cf\u5934\u7684\u591a\u9879\u63a7\u5236\uff0c\u5982\u95ea\u5149\uff0c3A\u63a7\u5236\u7b49\u3002<\/p>\n\n\n\n

2.EVS\u67b6\u6784\u5728\u8f6f\u4ef6\u5c42\u6b21\u4e0a\uff0c\u4e3b\u4f53\u5728HAL\u4e0eNative Framework\uff0c\u800cCamera2\u5728HAL,Native Framework\u4e0eApp\u5747\u6709\u6d89\u53ca\u3002\u8fd9\u4e5f\u6ce8\u5b9a\u4e86EVS\u5177\u6709\u66f4\u5feb\u7684\u54cd\u5e94\u3001\u66f4\u5feb\u7684\u542f\u52a8\uff0c\u66f4\u4f4e\u7684\u65f6\u5ef6\uff0c\u8fd9\u662fEVS\u67b6\u6784\u6700\u91cd\u8981\u7684\u7279\u6027\u4e4b\u4e00\u3002\u8003\u8651\u5230\u5728\u6c7d\u8f66\u51b7\u542f\u52a8\u65f6\uff0c\u7528\u6237\u5b58\u5728\u5012\u8f66\u7684\u53ef\u80fd\uff0c\u6b64\u65f6\u9700\u8981\u5b89\u5353\u7cfb\u7edf\u5feb\u901f\u54cd\u5e94\uff0c\u800c\u4e0e\u6b64\u540c\u65f6JVM\u53ef\u80fd\u8fd8\u672a\u542f\u52a8\uff0c\u662f\u65e0\u6cd5\u8fd0\u884cApplication\u7684\u3002\u4f7f\u7528Native\u6765\u5b9e\u73b0\u7531\u6b64\u5e94\u8fd0\u800c\u751f\u3002<\/p>\n\n\n\n

3.\u5728\u5f00\u53d1\u96be\u5ea6\u4e0a\uff0c\u7531\u4e8eCamera2\u5728Java Framework\u5c42\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684API\u652f\u6301\uff08CameraManager\uff09\uff0c\u4f7f\u5f97\u5f00\u53d1\u8005\u53ef\u4ee5\u5feb\u901f\u5f00\u53d1\u81ea\u5df1\u7684\u5e94\u7528\uff0c\u800cEVS\u5219\u9700\u8981\u5f00\u53d1\u8005\u81ea\u5df1\u53bb\u6784\u5efa\u8bf8\u5982Input\u7ba1\u7406,View\u5b50\u7cfb\u7edf\u7b49\uff0c\u4e5f\u9700\u8981\u4f7f\u7528OpenGL ES\u7684API\u53bb\u8fdb\u884c\u56fe\u50cf\u7ed8\u5236\uff0c\u5f00\u53d1\u96be\u5ea6\u76f8\u5bf9\u8f83\u5927\u3002\u6d89\u53ca\u5230\u7684\u6838\u5fc3\u6a21\u5757\u5305\u62ecCamera\u5b50\u7cfb\u7edf(\u5185\u6838v4l2\u3001EVS HAL)\uff0cInput\u5b50\u7cfb\u7edf(\u5185\u6838Input_event\u3001Eventhub)\u3001Graphics\u5b50\u7cfb\u7edf(OpenGL ES\u3001Graphicbuffer\u3001BufferQueue\u3001SurfaceFlinger)\uff0cView\u5b50\u7cfb\u7edf(layout\u3001touch handle)\uff0c\u5176\u4ed6\u7684\u8fd8\u5305\u62ecVehicle HAL\u3001Audio HAL\u7b49\u3002 <\/p>\n\n\n\n

\u5173\u4e8eCamera2\u67b6\u6784\u7684\u5206\u6790\u5df2\u7ecf\u6bd4\u8f83\u591a\u4e86\uff0c\u4f46\u5173\u4e8eEVS\u67b6\u6784\u7684\u5206\u6790\u662f\u6bd4\u8f83\u5c11\u7684\uff0c\u8fd9\u7bc7\u6587\u7ae0\u5c06\u5c3d\u53ef\u80fd\u5730\u5bf9EVS\u67b6\u6784\u505a\u4e00\u4e2a\u5b8c\u6574\u7684\u5206\u6790\u3002<\/p>\n\n\n\n

\u6574\u4f53\u67b6\u6784<\/h3>\n\n\n\n
\"\"<\/figure>\n\n\n\n

EVS\u7684\u5177\u4f53\u67b6\u6784\u4ecb\u7ecd\u53ef\u4ee5\u53c2\u8003\u5b98\u65b9\u5b98\u65b9\u6587\u6863\uff0c\u8fd9\u91cc\u501f\u9274\u5b98\u65b9\u6587\u6863\u4e0a\u7684\u67b6\u6784\u56fe\u3002\u501f\u7740\u8fd9\u5f20\u6846\u67b6\u56fe\uff0c\u6211\u4eec\u5c55\u5f00\u8bb2\u8bb2\u3002<\/p>\n\n\n\n

EVS\u67b6\u6784\u7684\u4e3b\u4f53\u5206\u4e3a\u56db\u90e8\u5206:CarEvsManager<\/strong>\u3001EVS APP\u3001EVS Manager<\/strong>\u4e0eEVS HAL<\/strong>.<\/p>\n\n\n\n

CarEvsManager\u662fCarService\u4e2d\u63d0\u4f9b\u7684\u5b50\u670d\u52a1\uff0c\u7528\u4e8e\u5411Android\u5e94\u7528\u63d0\u4f9b\u8bbf\u95eeEVS\u6846\u67b6\uff0c\u83b7\u53d6\u6444\u50cf\u5934\u6570\u636e\u5e76\u8fdb\u884c\u7ed8\u5236\u663e\u793a\u7684\u80fd\u529b\uff0cCarEvsManager\u4f1a\u8fde\u63a5\u5230CarEvsService\uff0c\u7531CarEvsService\u8fde\u63a5EVS Manager\uff0c\u4ece\u800c\u83b7\u53d6HAL\u670d\u52a1\u3002<\/p>\n\n\n\n

EVS APP\u5c06\u4f5c\u4e3aNative EVS\u5e94\u7528\u7684\u5177\u4f53\u5b9e\u73b0\u65b9\uff0c\u5728EVS APP\u4e2d\uff0c\u6700\u91cd\u8981\u7684\u4efb\u52a1\u5c31\u662f\u901a\u8fc7EVS Manager\u62ff\u5230\u5e95\u5c42HAL\u4f20\u9012\u7684Camera\u6570\u636e\uff0c\u5229\u7528OpenGL ES\u5b9e\u73b0\u7ed8\u5236\u6e32\u67d3\uff0c\u9664\u6b64\u4e4b\u5916\uff0cEVS APP\u5185\u8fd8\u9700\u8981\u5b9e\u73b0\u5bf9CAN\u4fe1\u53f7\u7684\u5904\u7406\uff0c\u5bf9Input\u8f93\u5165\u7684\u5904\u7406\u7b49\u7b49\uff0c\u5728\u5b89\u5353\u7cfb\u7edf\u672a\u542f\u52a8\u9700\u8981\u5feb\u901f\u54cd\u5e94\u65f6\uff0cEVS APP\u5c06\u4f5c\u4e3a\u5177\u4f53\u7684\u4e1a\u52a1\u627f\u8f7d\u65b9\u3002<\/p>\n\n\n\n

EVS Manager\u4f5c\u4e3a\u4e2d\u95f4\u5d4c\u5957\u7684\u4e00\u5c42\uff0c\u4e3aAPP\u63d0\u4f9b\u63a5\u5165EVS HAL\u7684\u63a5\u53e3\uff0c\u540c\u65f6\u5b9e\u73b0\u5bf9\u4e24\u4e2a\u91cd\u8981\u62bd\u8c61\u5bf9\u8c61\uff08EVS Camera\u4e0eEVS Display\uff09\u7684\u96c6\u4e2d\u7ba1\u7406\uff0c\u6b64\u5916\u8fd8\u63d0\u4f9b\u4e86\u989d\u5916\u7684\u8bf8\u5982\u6743\u9650\u7ba1\u7406\uff0c\u8bca\u65ad\u529f\u80fd\u7b49\u3002<\/p>\n\n\n\n

EVS HAL\u4f5c\u4e3a\u786c\u4ef6\u62bd\u8c61\u5c42\u7684\u5177\u4f53\u5b9e\u73b0\uff0c\u5c06\u4e0e\u5185\u6838\u9a71\u52a8\u8fdb\u884c\u4ea4\u4e92\uff0c\u83b7\u53d6\u5177\u4f53\u6444\u50cf\u5934\u6570\u636e\u3002\u5728\u8fd9\u4e00\u5c42\u5c06\u4f1a\u5b9e\u73b0\u4e24\u4e2a\u91cd\u8981\u7684\u62bd\u8c61\u5bf9\u8c61\uff1aEVS Camera\u4e0eEVS Display\u3002<\/p>\n\n\n\n

CarEvsManager\u6838\u5fc3\u662f\u4f5c\u4e3a\u4e0b\u5c42\u670d\u52a1\u7684warper\uff0c\u6838\u5fc3\u5185\u5bb9\u5e76\u4e0d\u591a\uff0c\u5728\u8fd9\u91cc\u6211\u4eec\u4e0d\u505a\u8fc7\u591a\u5206\u6790\uff1b\u63a5\u4e0b\u6765\u6211\u4eec\u5c06\u4f1a\u9488\u5bf9EVS\u67b6\u6784\u4e2d\u7684\u5176\u4f59\u4e09\u90e8\u5206\u8fdb\u884c\u5177\u4f53\u7684\u8bb2\u89e3\u3002<\/p>\n\n\n\n

EVS APP<\/h3>\n\n\n\n

\u4f5c\u4e3a\u539f\u751fNative\u5e94\u7528\uff0cEVS APP\u6700\u91cd\u8981\u7684\u8fd8\u662f\u4f1a\u56de\u5f52\u5230\u4f5c\u4e3a\u4e00\u4e2aAPP\u6240\u5e94\u5177\u5907\u7684\u4e1c\u897f\u3002\u4e0d\u8fc7\u539f\u751f\u7684EVS APP\u5b9e\u73b0\u5176\u5b9e\u662f\u76f8\u5f53\u4e0d\u5b8c\u5584\u7684\uff0c\u5728Android12\u4e2d\u4ec5\u652f\u6301\u7b80\u5355\u7684\u56fe\u50cf\u9884\u89c8\u3002<\/p>\n\n\n\n

\u6e90\u7801\u8def\u5f84\u4f4d\u4e8e\/packages\/services\/Car\/cpp\/evs\/apps\/default\uff0c\u7a0b\u5e8f\u5165\u53e3\u4f4d\u4e8eevs_app.cpp\u5185\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n

int main(int argc, char** argv)\n{\n    LOG(INFO) << \"EVS app starting\";\n    \/\/ Register a signal handler\n    registerSigHandler();\n    \/\/ Set up default behavior, then check for command line options\n    bool useVehicleHal = true;\n    bool printHelp = false;\n    const char* evsServiceName = \"default\";\n    int displayId = -1;\n    .....\n    android_pixel_format_t extMemoryFormat = HAL_PIXEL_FORMAT_RGBA_8888;\n    int32_t mockGearSignal = static_cast<int32_t>(VehicleGear::GEAR_REVERSE);\n    \/\/ Run forever, reacting to events as necessary\n\n    .....\n    LOG(INFO) << \"Entering running state\";\n    pEvsListener->run(pStateController);\n    LOG(ERROR) << \"EVS Listener stopped.  Exiting.\";\n    return EXIT_SUCCESS;\n}<\/code><\/pre>\n\n\n\n
\u5728EVS APP\u542f\u52a8\u65f6\uff0c\u4e3b\u8981\u505a\u4e86\u4ee5\u4e0b\u51e0\u4ef6\u4e8b\uff1a<\/p>\n\n\n\n
1.\u89e3\u6790\u4f20\u5165\u53c2\u6570\u5b9e\u73b0\u5dee\u5f02\u5316\u542f\u52a8\uff0c\u5177\u4f53\u53ef\u914d\u7f6e\u9879\u53ef\u4ee5\u901a\u8fc7\u8fd0\u884c\u65f6\u52a0\u5165–help\u53c2\u6570\u8fdb\u884c\u67e5\u770b\u3002<\/p>\n\n\n\n
2.\u8bfb\u53d6\u914d\u7f6e\u6587\u4ef6\uff0c\u901a\u8fc7\u89e3\u6790\u914d\u7f6e\u6587\u4ef6\u5177\u4f53\u5185\u5bb9\u83b7\u53d6\u786c\u4ef6\u4fe1\u606f.\u5728\u542f\u52a8\u65f6EVS\u4f1a\u4f18\u5148\u8bfb\u53d6\/system\/etc\/automotive\/evs\/config_override.json\uff0c\u8be5\u914d\u7f6e\u6587\u4ef6\u4e00\u822c\u662f\u7531OEM\u4ea7\u5546\u81ea\u884c\u914d\u7f6e\u7684\u3002\u5982\u679c\u8be5\u914d\u7f6e\u6587\u4ef6\u8bfb\u53d6\u5b58\u5728\u95ee\u9898\uff0c\u5219\u4f1a\u4ee5\u89e3\u6790\u914d\u7f6e\u6587\u4ef6\/system\/etc\/automotive\/evs\/config.json\u3002<\/p>\n\n\n\n
3.\u83b7\u53d6\u5e95\u5c42Evs Display\u64cd\u4f5c\u5bf9\u8c61\uff0cDisplay\u5c06\u6307\u5b9a\u5728\u591a\u4e2a\u5c4f\u5e55\u4e4b\u95f4\u7684\u5177\u4f53\u663e\u793a\u4f4d\u7f6e\u3002<\/p>\n\n\n\n
4.\u5728\u9700\u8981\u4f7f\u7528Vehicle HAL\u7684\u524d\u63d0\u4e0b\uff0c\u8fde\u63a5Vehicle HAL\uff0c\u8ba2\u9605\u8f66\u8f86\u6321\u4f4d\u4fe1\u606f\u4e0e\u8f6c\u5411\u706f\u4fe1\u606f\u3002\u5f53\u6570\u636e\u53d8\u5316\u65f6\u901a\u8fc7listener\u56de\u8c03\u5904\u7406\u3002<\/p>\n\n\n\n
5.\u5f00\u542fEvsStateControl\u72b6\u6001\u66f4\u65b0\u7ebf\u7a0b\uff0c\u5728\u8be5\u7ebf\u7a0b\u5185\u6839\u636e\u5916\u90e8\u8f93\u5165\u8c03\u6574EVS APP\u7684\u8fd0\u884c\u72b6\u6001\u4ee5\u53ca\u5b9e\u73b0\u5177\u4f53\u7684\u56fe\u50cf\u7ed8\u5236\u3002<\/p>\n\n\n\n
\u5728\u539f\u751fEVS APP\u7684\u5b9e\u73b0\u4e2d\uff0c\u91cd\u70b9\u5c31\u5728\u8fd9\u7b2c5\u4ef6\u4e8b\u4e0a\u3002\u8fd9\u91cc\u8d34\u4e0aEvsStateControl\u4e2d\u72b6\u6001\u66f4\u65b0\u5904\u7406\u7ebf\u7a0b\u7684\u90e8\u5206\u4ee3\u7801\uff1a<\/p>\n\n\n\n
void EvsStateControl::updateLoop()\n{\n    LOG(DEBUG) << \"Starting EvsStateControl update loop\";\n    bool run = true;\n    while (run)\n    {\n        \/\/ Process incoming commands\n        sp<IEvsDisplay> displayHandle;\n        {\n            std::lock_guard<std::mutex> lock(mLock);\n            while (!mCommandQueue.empty())\n            {\n                const Command& cmd = mCommandQueue.front();\n                switch (cmd.operation)\n                {\n                case Op::EXIT:\n                    run = false;\n                    break;\n                case Op::CHECK_VEHICLE_STATE:\n                .....\n            }\n            displayHandle = mDisplay.promote();\n        }\n        \/\/ Review vehicle state and choose an appropriate renderer\n        if (!selectStateForCurrentConditions())\n        {\n            break;\n        }\n        \/\/ If we have an active renderer, give it a chance to draw\n        if (mCurrentRenderer)\n        {\n          .....\n        }\n    }\n    LOG(WARNING) << \"EvsStateControl update loop ending\";\n    if (mCurrentRenderer)\n    {\n        \/\/ Deactive the renderer\n        mCurrentRenderer->deactivate();\n    }\n    mEvsStats.sendCollectedDataBlocking();\n    LOG(ERROR) << \"Shutting down app due to state control loop ending\";\n}<\/code><\/pre>\n\n\n\n
\u5728\u8be5\u7ebf\u7a0b\u4e2d\uff0c\u4e00\u76f4\u5468\u671f\u6027\u5faa\u73af\u505a\u4e09\u4ef6\u4e8b\uff1a<\/p>\n\n\n\n
1.\u83b7\u53d6\u5916\u90e8\u8f93\u5165\u7684command\u4fe1\u606f\uff0c\u5305\u542bEXIT\u3001CHECK_VEHICLE_STATE\u4e0eTOUCH_EVENT\u4e09\u7c7b\u3002\u539f\u751fAPP\u4e2d\u76ee\u524d\u4ec5\u5904\u7406\u4e86 EXIT  command\uff0c\u5176\u4f59\u5747\u672a\u5904\u7406\u3002<\/strong><\/p>\n\n\n\n
2.\u901a\u8fc7\u5bf9selectStateForCurrentConditions\u7684\u8c03\u7528\uff0c\u5bf9\u8f66\u8eab\u4fe1\u53f7\u2014\u2014\u6321\u4f4d\u4fe1\u606f\u4e0e\u8f6c\u5411\u7684\u4fe1\u606f\u505a\u5224\u65ad\uff0c\u7ed3\u5408\u914d\u7f6e\u7528\u4e8e\u88c1\u5b9a\u5f53\u524d\u7684\u7ed8\u5236\u6a21\u5f0f\u3002\u5982\u5f53\u524d\u5904\u4e8e\u5012\u6321\uff0c\u4e14\u5728\u8be5\u6a21\u5f0f\u4e0b\u53ea\u6709\u4e00\u4e2a\u6444\u50cf\u5934\uff0c\u5219\u4f1a\u9009\u62e9RenderDirectView\u6a21\u5f0f\uff0c\u5982\u679c\u5728\u8be5\u6a21\u5f0f\u4e0b\u5b58\u5728\u591a\u4e2a\u6444\u50cf\u5934\uff0c\u5219\u9009\u62e9RenderTopView\u6a21\u5f0f\u3002<\/strong><\/p>\n\n\n\n
3.\u5728\u7ed8\u5236\u6a21\u5f0f\u786e\u5b9a\u7684\u60c5\u51b5\u4e0b\uff0c\u8c03\u7528drawFrame\u63a5\u53e3\u8fdb\u884c\u56fe\u50cf\u7ed8\u5236\u3002<\/strong><\/p>\n\n\n\n
\u8fd9\u5c31\u662f\u539f\u751fEVS APP\u4e3b\u4f53\u4e0a\u6240\u5b9e\u73b0\u7684\u529f\u80fd\uff0c\u5f53\u7136\u8fd9\u91cc\u9762\u5176\u5b9e\u6709\u5f88\u591a\u7ec6\u8282\uff0c\u5177\u4f53\u5305\u62ec\uff1a<\/p>\n\n\n\n