{"id":51129,"date":"2025-08-10T18:05:08","date_gmt":"2025-08-10T10:05:08","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/51129.html"},"modified":"2025-08-10T18:05:08","modified_gmt":"2025-08-10T10:05:08","slug":"%e5%a4%9a%e6%91%84%e5%83%8f%e5%a4%b4%e9%80%bb%e8%be%91%e8%9e%8d%e5%90%88%ef%bc%88logical-camera%ef%bc%89%e7%9a%84-cameraservice-%e5%ae%9e%e7%8e%b0%e6%9c%ba%e5%88%b6%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/51129.html","title":{"rendered":"\u591a\u6444\u50cf\u5934\u903b\u8f91\u878d\u5408\uff08Logical Camera\uff09\u7684 CameraService \u5b9e\u73b0\u673a\u5236\u8be6\u89e3"},"content":{"rendered":"<h2>\u591a\u6444\u50cf\u5934\u903b\u8f91\u878d\u5408\uff08Logical Camera\uff09\u7684 CameraService \u5b9e\u73b0\u673a\u5236\u8be6\u89e3<\/h2>\n<p>\u5173\u952e\u8bcd\uff1a Logical Camera\u3001CameraService\u3001\u591a\u6444\u878d\u5408\u3001\u7269\u7406\u6444\u50cf\u5934\u3001CameraMetadata\u3001CameraDeviceSession\u3001\u591a\u6a21\u7ec4\u3001\u52a8\u6001\u5207\u6d41\u3001AIDL \u67b6\u6784<\/p>\n<p>\u6458\u8981\uff1a \u968f\u7740\u624b\u673a\u5f71\u50cf\u7cfb\u7edf\u5411\u591a\u6a21\u7ec4\u6f14\u8fdb\uff0cAndroid \u67b6\u6784\u5f15\u5165 Logical Camera \u673a\u5236\uff0c\u901a\u8fc7 CameraService \u5c06\u591a\u4e2a\u7269\u7406\u6444\u50cf\u5934\u62bd\u8c61\u4e3a\u4e00\u4e2a\u903b\u8f91\u8bbe\u5907\uff0c\u5b9e\u73b0\u5e7f\u89d2\u3001\u957f\u7126\u3001\u4e3b\u6444\u7b49\u81ea\u52a8\u65e0\u7f1d\u5207\u6362\u4e0e\u56fe\u50cf\u878d\u5408\u3002\u5728 HAL3 \u67b6\u6784\u4e0e AIDL \u5316\u8fdb\u7a0b\u4e2d\uff0cLogical Camera \u5e76\u975e\u7b80\u5355\u7684 ID \u805a\u5408\uff0c\u800c\u662f\u6d89\u53ca\u5143\u6570\u636e\u534f\u5546\u3001\u8bf7\u6c42\u8def\u7531\u3001\u6d41\u914d\u7f6e\u590d\u7528\u7b49\u590d\u6742\u673a\u5236\u3002\u672c\u6587\u4ece CameraService \u6e90\u7801\u51fa\u53d1\uff0c\u8be6\u7ec6\u89e3\u6790\u5176\u5728 Logical Camera \u6ce8\u518c\u3001\u80fd\u529b\u58f0\u660e\u3001\u8bf7\u6c42\u8c03\u5ea6\u4e0e\u7269\u7406\u8f93\u51fa\u7ba1\u7406\u7b49\u73af\u8282\u7684\u5b9e\u73b0\u903b\u8f91\uff0c\u7ed3\u5408\u4e3b\u6d41\u5e73\u53f0\uff08\u5982\u9ad8\u901a\/MTK\uff09\u9002\u914d\u7ecf\u9a8c\uff0c\u7ed9\u51fa\u591a\u6444\u9879\u76ee\u5de5\u7a0b\u843d\u5730\u7684\u5173\u952e\u6307\u5bfc\u3002<\/p>\n<hr>\n<h3>\u76ee\u5f55<\/h3>\n<li>Logical Camera \u6982\u8ff0\u4e0e\u7cfb\u7edf\u5b9a\u4f4d\uff1a\u4e3a\u4f55\u9700\u8981\u903b\u8f91\u8bbe\u5907\u62bd\u8c61\uff1f<\/li>\n<li>CameraService \u4e2d\u7684 Logical Camera \u8bc6\u522b\u4e0e\u6ce8\u518c\u6d41\u7a0b<\/li>\n<li>CameraIdMap \u6784\u5efa\uff1a\u5982\u4f55\u7ed1\u5b9a\u591a\u4e2a Physical Camera \u6210\u4e00\u4e2a\u903b\u8f91\u8bbe\u5907<\/li>\n<li>CameraCharacteristics \u805a\u5408\u673a\u5236\uff1a\u80fd\u529b\u52a8\u6001\u5408\u5e76\u4e0e\u9650\u5236\u7b56\u7565<\/li>\n<li>\u8bf7\u6c42\u4e0b\u53d1\u8def\u5f84\u89e3\u6790\uff1aLogical \u2192 Physical \u7684\u52a8\u6001\u6620\u5c04\u4e0e\u8def\u7531\u63a7\u5236<\/li>\n<li>\u7269\u7406\u6d41\u914d\u7f6e\u4e0e Buffer \u7ba1\u7406\uff1a\u5982\u4f55\u62c6\u5206\u6d41 \u00d7 \u72ec\u7acb\u63a8\u9001<\/li>\n<li>\u591a\u6444\u534f\u540c\u884c\u4e3a\u652f\u6301\uff1a\u53d8\u7126\u878d\u5408\u3001\u573a\u666f\u5207\u6362\u4e0e\u56fe\u50cf\u5bf9\u9f50\u673a\u5236<\/li>\n<li>\u5de5\u7a0b\u5b9e\u6218\u5efa\u8bae\uff1aHAL \u80fd\u529b\u58f0\u660e\u3001Metadata \u6620\u5c04\u4e0e\u5e73\u53f0\u517c\u5bb9\u6027\u5dee\u5f02<\/li>\n<hr>\n<h4>\u4e00\u3001Logical Camera \u6982\u8ff0\u4e0e\u7cfb\u7edf\u5b9a\u4f4d\uff1a\u4e3a\u4f55\u9700\u8981\u903b\u8f91\u8bbe\u5907\u62bd\u8c61\uff1f<\/h4>\n<h5>1.1 \u591a\u6444\u65f6\u4ee3\u7684\u7cfb\u7edf\u6311\u6218<\/h5>\n<p>\u968f\u7740\u624b\u673a\u6444\u50cf\u6a21\u7ec4\u4e0d\u65ad\u6f14\u5316\uff0c\u4ece\u5355\u6444 \u2192 \u53cc\u6444 \u2192 \u4e09\u6444\uff08\u4e3b\u6444\u3001\u5e7f\u89d2\u3001\u957f\u7126\uff09\u6210\u4e3a\u884c\u4e1a\u4e3b\u6d41\u3002\u6bcf\u4e2a\u7269\u7406\u6444\u50cf\u5934\uff08Physical Camera\uff09\u62e5\u6709\u72ec\u7acb\u7684\u4f20\u611f\u5668\u4e0e\u6210\u50cf\u8def\u5f84\uff0c\u4f20\u7edf\u4e0a\u9700\u8981\u7528\u6237\u6216 App \u5206\u522b\u9009\u62e9\u6bcf\u4e2a cameraId \u8fdb\u884c\u64cd\u4f5c\uff0c\u8fd9\u5728\u7528\u6237\u4f53\u9a8c\u4e0e\u5f00\u53d1\u4e0a\u90fd\u4e0d\u53cb\u597d\u3002<\/p>\n<p>\u95ee\u9898\u8868\u73b0\uff1a<\/p>\n<ul>\n<li>App \u9700\u624b\u52a8\u679a\u4e3e cameraId \u8fdb\u884c\u5207\u6362\uff1b<\/li>\n<li>\u4e0d\u540c\u6a21\u7ec4\u6210\u50cf\u80fd\u529b\u4e0d\u4e00\u81f4\uff0c\u5207\u6362\u590d\u6742\uff1b<\/li>\n<li>\u5f71\u54cd\u6574\u4f53\u62cd\u7167\u54cd\u5e94\u6d41\u7545\u6027\u4e0e\u591a\u6a21\u7ec4\u534f\u540c\u3002<\/li>\n<\/ul>\n<hr>\n<h5>1.2 Logical Camera \u7684\u8bbe\u8ba1\u76ee\u6807<\/h5>\n<p>Android 8.0+ \u5f15\u5165\u4e86 Logical Camera \u6982\u5ff5\uff0c\u65e8\u5728\u4ee5 \u5355\u4e00 cameraId \u5bf9\u5916\u62bd\u8c61\u51fa\u591a\u4e2a\u7269\u7406\u6444\u50cf\u5934\u7684\u878d\u5408\u80fd\u529b\uff0c\u8ba9\u4e0a\u5c42 App \u65e0\u9700\u611f\u77e5\u5e95\u5c42\u591a\u6a21\u7ec4\u5207\u6362\u903b\u8f91\u3002<\/p>\n<p>\u6838\u5fc3\u4ef7\u503c\uff1a<\/p>\n<ul>\n<li>\u7edf\u4e00\u62bd\u8c61\uff1a\u4e00\u4e2a cameraId \u53ef\u4ee3\u8868\u591a\u4e2a Physical Camera\uff1b<\/li>\n<li>\u80fd\u529b\u805a\u5408\uff1a\u81ea\u52a8\u805a\u5408\u591a\u4e2a\u4f20\u611f\u5668\u53c2\u6570\u3001\u6d41\u652f\u6301\u683c\u5f0f\uff1b<\/li>\n<li>\u52a8\u6001\u5207\u6362\uff1a\u7cfb\u7edf\u5728\u4e0d\u540c\u7126\u6bb5\/\u5149\u7ebf\u6761\u4ef6\u4e0b\u9009\u62e9\u6700\u4f18\u6a21\u7ec4\uff1b<\/li>\n<li>\u534f\u540c\u878d\u5408\uff1a\u652f\u6301 zoom\u3001\u8d85\u5206\u3001\u591a\u66dd\u5149 HDR \u7b49\u590d\u5408\u529f\u80fd\u3002<\/li>\n<\/ul>\n<hr>\n<h5>1.3 \u7cfb\u7edf\u7ec4\u4ef6\u534f\u4f5c\u8def\u5f84<\/h5>\n<p>Logical Camera \u6d89\u53ca\u4ece HAL \u5230 Framework \u7684\u5168\u6808\u534f\u4f5c\uff1a<\/p>\n<p>Camera HAL\uff08\u591a\u4e2a physical device\uff09<br \/>\n     \u2193<br \/>\nCameraProvider \/ CameraService<br \/>\n     \u2193<br \/>\nLogical Camera \u903b\u8f91\u6ce8\u518c\uff08cameraId \u2192 device group\uff09<br \/>\n     \u2193<br \/>\nCamera2 API \/ CameraX\uff08\u5bf9 App \u66b4\u9732\u5355\u4e00\u63a5\u53e3\uff09<\/p>\n<p>\u5728\u7cfb\u7edf\u670d\u52a1\u5c42\uff08CameraService\uff09\u5b8c\u6210 device \u4fe1\u606f\u805a\u5408\u4e0e\u903b\u8f91 id \u6784\u5efa\uff1bFramework \u518d\u57fa\u4e8e CameraCharacteristics \u51b3\u5b9a\u662f\u5426\u5f00\u542f\u591a\u7269\u7406\u8bbe\u5907\u7684\u80fd\u529b\u4e0b\u53d1\uff08\u5982 setPhysicalCameraId\uff09\u3002<\/p>\n<hr>\n<h4>\u4e8c\u3001CameraService \u4e2d\u7684 Logical Camera \u8bc6\u522b\u4e0e\u6ce8\u518c\u6d41\u7a0b<\/h4>\n<h5>2.1 CameraProvider \u542f\u52a8\u4e0e\u8bbe\u5907\u679a\u4e3e<\/h5>\n<p>\u5728\u7cfb\u7edf\u542f\u52a8\u6216 camera provider \u542f\u52a8\u9636\u6bb5\uff0cCameraService \u4f1a\u901a\u8fc7 CameraProviderManager \u679a\u4e3e\u6240\u6709\u5e95\u5c42\u7269\u7406\u8bbe\u5907\uff0c\u8c03\u7528 getCameraIdList() \u83b7\u5f97\u6240\u6709\u6ce8\u518c\u7684 camera id\u3002<\/p>\n<p><span class=\"token comment\">\/\/ frameworks\/av\/services\/camera\/libcameraservice\/common\/CameraProviderManager.cpp<\/span><\/p>\n<p>status_t <span class=\"token class-name\">CameraProviderManager<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    mProvider<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">getCameraIdList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>cameraDeviceIds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u542b physical + logical<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6b64\u9636\u6bb5\u4f1a\u8bc6\u522b\u51fa\u54ea\u4e9b\u8bbe\u5907\u5c5e\u4e8e\u591a\u6a21\u7ec4\u7ed3\u6784\uff0c\u8bb0\u5f55\u5176 physical devices \u4fe1\u606f\u3002<\/p>\n<hr>\n<h5>2.2 \u5224\u65ad\u662f\u5426\u4e3a Logical Camera<\/h5>\n<p>\u6839\u636e HAL \u8fd4\u56de\u7684 metadata \u4e2d\u662f\u5426\u5b58\u5728\u4ee5\u4e0b\u5b57\u6bb5\u6765\u5224\u65ad\uff1a<\/p>\n<p>android<span class=\"token punctuation\">.<\/span>request<span class=\"token punctuation\">.<\/span>availablePhysicalCameraIds<\/p>\n<p>\u5982\u5b58\u5728\uff0c\u5219\u8be5 cameraId \u88ab\u89c6\u4e3a Logical Camera\uff0c\u5176\u5bf9\u5e94\u7684 physical camera ID \u4f1a\u88ab\u5b58\u50a8\u5728\uff1a<\/p>\n<p>mPhysicalDeviceMap<span class=\"token punctuation\">[<\/span>logicalCameraId<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">=<\/span> vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;<\/span> physicalIds<\/p>\n<p>\u8be5\u5b57\u6bb5\u6765\u81ea HAL \u7684 camera_metadata_t\uff0c\u7531 vendor \u5c42\u6839\u636e\u6a21\u7ec4\u5e03\u5c40\u4e0a\u62a5\uff0c\u5982\uff1a<\/p>\n<p>android.request.availablePhysicalCameraIds = [\\&#8221;2\\&#8221;, \\&#8221;3\\&#8221;]  \/\/ \u4e3b\u6444 + \u5e7f\u89d2<\/p>\n<hr>\n<h5>2.3 Logical Camera \u7684\u6ce8\u518c\u673a\u5236<\/h5>\n<p>\u4e00\u65e6\u8bc6\u522b\u4e3a Logical Camera\uff0cCameraService \u4f1a\u5c06\u5176\u901a\u8fc7 CameraDeviceInfo \u6ce8\u518c\u4e3a\u4e00\u4e2a\u201c\u53ef\u7528\u76f8\u673a\u201d\uff1a<\/p>\n<p>mDeviceInfoMap<span class=\"token punctuation\">[<\/span>logicalCameraId<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">CameraDeviceInfo<\/span><span class=\"token punctuation\">(<\/span>logicalId<span class=\"token punctuation\">,<\/span> physicalIds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8be5\u8fc7\u7a0b\u5b8c\u6210\u4ee5\u4e0b\u529f\u80fd\uff1a<\/p>\n<ul>\n<li>\u6620\u5c04 cameraId \u2192 CameraDeviceSession\uff08\u5185\u90e8\u6301\u6709\u591a\u4e2a PhysicalSession\uff09<\/li>\n<li>\u805a\u5408\u80fd\u529b\uff08\u901a\u8fc7 filterLogicalCameraMetadataLocked() \u5b9e\u73b0\uff09<\/li>\n<li>\u8bbe\u7f6e\u652f\u6301\u7684 stream \u7ec4\u5408<\/li>\n<li>\u786e\u4fdd\u5411 App \u63d0\u4f9b\u7684\u662f\u903b\u8f91\u805a\u5408\u540e\u7684 metadata<\/li>\n<\/ul>\n<hr>\n<h5>2.4 AIDL \u67b6\u6784\u4e0b\u7684\u5904\u7406\u5dee\u5f02\uff08Android 13+\uff09<\/h5>\n<p>\u5728 AIDL Camera HAL \u7ed3\u6784\u4e2d\uff0cCameraService \u4f1a\u901a\u8fc7\u5982\u4e0b\u8def\u5f84\u5904\u7406\uff1a<\/p>\n<ul>\n<li>ICameraProvider::getCameraIdList() \u2192 ICameraDevice::getCameraMetadata()<\/li>\n<li>\u5224\u65ad\u662f\u5426\u5b58\u5728\u591a\u4e2a\u5b50\u8bbe\u5907\uff08physicalDeviceInterfaces\uff09<\/li>\n<li>\u8c03\u7528 setPhysicalCameraMetadata() \u8bbe\u7f6e\u5bf9\u5e94\u7ed3\u6784\u4f53<\/li>\n<li>\u7edf\u4e00\u5728 CameraDeviceClient \u4e2d\u7ef4\u62a4 mPhysicalDeviceIds<\/li>\n<\/ul>\n<p>\u8be5\u67b6\u6784\u663e\u8457\u63d0\u5347\u4e86\u591a\u6a21\u7ec4\u914d\u7f6e\u80fd\u529b\u7684\u7075\u6d3b\u6027\uff0c\u5e76\u4e3a\u52a8\u6001\u6a21\u7ec4\uff08\u5982\u6f5c\u671b\u6a21\u7ec4\u3001\u52a8\u6001\u5bf9\u7126\u9635\u5217\uff09\u6253\u4e0b\u57fa\u7840\u3002<\/p>\n<hr>\n<h5>2.5 \u793a\u4f8b\u65e5\u5fd7\u5224\u65ad\u65b9\u6cd5<\/h5>\n<p>\u5728\u7cfb\u7edf logcat \u4e2d\uff0c\u53ef\u901a\u8fc7\u4ee5\u4e0b\u5173\u952e log \u8bc6\u522b Logical Camera \u52a0\u8f7d\uff1a<\/p>\n<p>CameraService: Adding logical camera device ID 0, physical devices: [2, 3]<br \/>\nCameraService: Camera 0 supports stream combination across physical devices<\/p>\n<p>\u5176\u4e2d\uff1a<\/p>\n<ul>\n<li>ID 0 \u662f\u903b\u8f91\u6444\u50cf\u5934\uff0c\u5bf9\u5916\u66b4\u9732\uff1b<\/li>\n<li>2, 3 \u4e3a\u5176\u7269\u7406\u8bbe\u5907\u6210\u5458\u3002<\/li>\n<\/ul>\n<hr>\n<h4>\u5c0f\u7ed3<\/h4>\n<p>Logical Camera \u7684\u5f15\u5165\uff0c\u662f Android Camera \u67b6\u6784\u4ece\u5355 sensor \u6a21\u5f0f\u8d70\u5411\u878d\u5408\u611f\u77e5\u7684\u91cd\u8981\u8f6c\u6298\u3002\u5728 CameraService \u5c42\uff0c\u5176\u4e0d\u4ec5\u662f ID \u805a\u5408\uff0c\u66f4\u627f\u62c5\u4e86\u80fd\u529b\u6620\u5c04\u3001\u7269\u7406 session \u7ba1\u7406\u4e0e\u6d41\u534f\u5546\u8c03\u5ea6\u7684\u804c\u8d23\u3002\u7406\u89e3\u8fd9\u4e00\u8fc7\u7a0b\u662f\u6df1\u5165\u638c\u63e1\u591a\u6444\u7cfb\u7edf\u8c03\u8bd5\u4e0e\u5de5\u7a0b\u9002\u914d\u7684\u57fa\u7840\u3002<\/p>\n<h4>\u4e09\u3001CameraIdMap \u6784\u5efa\uff1a\u5982\u4f55\u7ed1\u5b9a\u591a\u4e2a Physical Camera \u6210\u4e00\u4e2a\u903b\u8f91\u8bbe\u5907<\/h4>\n<h5>3.1 \u6570\u636e\u7ed3\u6784\u89c6\u89d2\uff1aCameraIdMap \u7684\u53cc\u5411\u6620\u5c04<\/h5>\n<p>\u5728 CameraService \u521d\u59cb\u5316\u8bbe\u5907\u5217\u8868\u8fc7\u7a0b\u4e2d\uff0c\u7cfb\u7edf\u901a\u8fc7 CameraProviderManager \u5b8c\u6210 cameraId \u5230\u5b9e\u9645\u8bbe\u5907\u63a5\u53e3\u7684\u6620\u5c04\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>mDeviceStatusMap\uff1acameraId \u2192 device \u72b6\u6001<\/li>\n<li>mCameraDeviceInterfaceMap\uff1acameraId \u2192 ICameraDevice \u63a5\u53e3\uff08AIDL\/HIDL\uff09<\/li>\n<li>mCameraIdMap\uff1acameraId \u2192 CameraDeviceInfo\uff08\u5305\u542b\u662f\u5426 logical\u3001physical ids\uff09<\/li>\n<\/ul>\n<p>\u5bf9\u4e8e Logical Camera\uff0c\u5b83\u7684 CameraIdMap \u5efa\u7acb\u5982\u4e0b\u7ed3\u6784\uff1a<\/p>\n<p><span class=\"token comment\">\/\/ cameraId: \\&#8221;0\\&#8221;\uff08\u903b\u8f91\uff09<\/span><br \/>\nmCameraIdMap<span class=\"token punctuation\">[<\/span><span class=\"token string\">\\&#8221;0\\&#8221;<\/span><span 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