{"id":4281,"date":"2023-01-14T10:19:32","date_gmt":"2023-01-14T02:19:32","guid":{"rendered":"https:\/\/blog.coderfan.org\/?p=4281"},"modified":"2023-03-07T13:57:13","modified_gmt":"2023-03-07T05:57:13","slug":"android-native-use-libyuv-to-convert-formats","status":"publish","type":"post","link":"https:\/\/blog.coderfan.org\/en\/android-native-use-libyuv-to-convert-formats.html","title":{"rendered":"Android Native\u4f7f\u7528libyuv\u5b9e\u73b0Camera\u6570\u636e\u683c\u5f0f\u8f6c\u6362"},"content":{"rendered":"
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\n \t<\/i> Read Time:<\/span>2 Minute, 50 Second <\/div>\n\n <\/div>\n

During Android Camera development,we will encounter format convertation occasionally.Here we may have two conditions\uff1a<\/p>\n\n\n\n

1.Driver exchange data with HAL,may need format conversion.<\/p>\n\n\n\n

2.HAL exchange data with Native Service,may need format conversion.<\/p>\n\n\n\n

libyuv is a open-sourced and maintained by Google,which is designed for Video format conversion.By using this tool,we can handle format conversion easily between different kinds of formats.<\/p>\n\n\n\n

Background<\/h3>\n\n\n\n

Before using libyuv,we need to know some basis about Camera data format.<\/p>\n\n\n\n

First we need know a concept called Color Space,here we have two common Color Space species:RGB Color Space\u3001YUV Color Space,these two are most common during our development.<\/p>\n\n\n\n

RGB\u8272\u5f69\u7a7a\u95f4\u60f3\u5fc5\u5927\u5bb6\u90fd\u5f88\u4e86\u89e3\uff0c\u5728\u8be5\u8272\u5f69\u7a7a\u95f4\u5185\uff0c\u6211\u4eec\u4f7f\u7528\u4e09\u539f\u8272\u2014\u2014\u5373\u7ea2\u8272\uff08Red\uff09\u3001\u7eff\u8272\uff08Green\uff09\u4e0eBlue\uff08\u84dd\u8272\uff09\u6765\u8868\u793a\u6240\u6709\u7684\u989c\u8272\u7ec4\u5408\u3002\u6211\u4eec\u5728\u4f7f\u7528\u65f6\uff0c\u4e00\u822c\u8fd8\u589e\u52a0\u4e86\u4e00\u4e2a\u900f\u660e\u5ea6\uff08Alpha\uff09\u7684\u914d\u7f6e\uff0c\u6240\u4ee5\u901a\u5e38\u6211\u4eec\u4f1a\u5728\u4ee3\u7801\u4e2d\u770b\u5230RGBA\u8fd9\u6837\u7684\u5b57\u773c\uff0c\u8fd9\u8868\u793a\u6211\u4eec\u56fe\u50cf\u4e2d\u7684\u6700\u5c0f\u5355\u5143\uff08\u6211\u4eec\u79f0\u5176\u4e3a\u50cf\u7d20\uff09\u7684\u8272\u5f69\u4fe1\u606f\u5373\u901a\u8fc7RGBA\u7684\u5f62\u5f0f\u6765\u8868\u793a\u3002\u5728\u7a0b\u5e8f\u5185\u90e8\u8fdb\u884c\u8868\u8fbe\u65f6\uff0c\u6211\u4eec\u4e00\u822c\u8ba4\u4e3a\u6bcf\u4e00\u4e2a\u5206\u91cf\u5360\u4e00\u4e2a\u5b57\u8282\uff0c\u6240\u4ee5RGBA8888\u4ee3\u8868\u6bcf\u4e2a\u5206\u91cf\u53608\u4e2abit\uff0c\u4e00\u4e2a\u50cf\u7d20\u5360\u75284\u4e2a\u5b57\u8282\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n\n\n\n

\u53e6\u4e00\u4e2a\u6bd4\u8f83\u5e38\u89c1\u7684\u8272\u5f69\u7a7a\u95f4\u5373\u662fYUV\u8272\u5f69\u7a7a\u95f4\uff0c\u5728YUV\u8272\u5f69\u7a7a\u95f4\u4e2d\uff0c\u6211\u4eec\u5c06\u4e00\u4e2a\u50cf\u7d20\u7684\u8272\u5f69\u4fe1\u606f\u5206\u4e3a\u4e24\u90e8\u5206\uff1a\u4eae\u5ea6\u4fe1\u606f<\/strong>\u4e0e\u989c\u8272\u4fe1\u606f<\/strong>\u3002\u8fd9\u5176\u4e2dY\u4ee3\u8868\u4eae\u5ea6\u4fe1\u606f\uff08luminance\uff09\uff0c\u800cUV\u6574\u4f53\u4ee3\u8868\u989c\u8272\u4fe1\u606f\uff0cU\u8868\u793a\u8272\u5ea6\u4fe1\u606f\uff0c\u4e5f\u5c31\u662f\u8272\u8c03\uff0c\u800cV\u8868\u793a\u6d53\u5ea6\u4fe1\u606f\uff0c\u4e5f\u5c31\u662f\u9971\u548c\u5ea6\u3002\u5728\u65e9\u671f\u7684\u5f69\u8272\u7535\u89c6\u884c\u4e1a\uff0c\u5b66\u8005\u4eec\u4e5f\u5c06YUV\u79f0\u4e3aYCbCr\uff0c\u5176\u4e2dCr\u53cd\u6620\u7684\u662fRGB\u8f93\u5165\u4fe1\u53f7\u7ea2\u8272\u90e8\u5206\u4e0eRGB\u8f93\u5165\u4eae\u5ea6\u4e4b\u95f4\u7684\u5dee\u5f02\uff0c\u7b49\u4ef7\u4e8eV\uff1b\u800cCb\u53cd\u5e94\u7684\u662fRGB\u8f93\u5165\u4fe1\u53f7\u4e2d\u84dd\u8272\u90e8\u5206\u4e0eRGB\u8f93\u5165\u4eae\u5ea6\u4e4b\u95f4\u7684\u5dee\u5f02\uff0c\u7b49\u4ef7\u4e8eU\u3002<\/p>\n\n\n\n

\u5728YUV\u8272\u5f69\u7a7a\u95f4\u4e2d\uff0c\u6709\u4e00\u4e2a\u91c7\u6837\u7684\u6982\u5ff5\uff0c\u76ee\u524d\u5206\u4e3a\u4e09\u79cd\u91c7\u6837\uff1aYUV444\uff0cYUV422\uff0c\u4e0eYUV420\uff0c\u4e0d\u540c\u7684\u91c7\u6837\u4f1a\u5bfc\u81f4\u6bcf\u4e2a\u50cf\u7d20\u6240\u5360\u7528\u7684\u5185\u5b58\u5927\u5c0f\u4e0d\u540c\u3002<\/p>\n\n\n\n

\u5173\u4e8e\u8fd9\u4e09\u79cd\u91c7\u6837\u5f62\u5f0f\u7684\u4e0d\u540c\uff0c\u53ef\u4ee5\u53c2\u8003\u5982\u4e0b\u793a\u610f\u56fe,\u4ee5\u9ed1\u8272\u5b9e\u5fc3\u5706\u4ee3\u8868Y\u5206\u91cf\uff0c\u767d\u8272\u5b9e\u5fc3\u4ee3\u8868UV\u5206\u91cf\uff1a<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

\u7b80\u5355\u6765\u8bb2\uff1a<\/p>\n\n\n\n

\u5728YUV444\u91c7\u6837\u4e2d\uff0c\u6bcf\u4e00\u4e2aY\u5206\u91cf\uff0c\u5bf9\u5e94\u4e00\u7ec4UV\u5206\u91cf\uff0c\u6392\u5217\u5f62\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n

YYYYYYYY UV UV UV UV UV UV UV UV\uff08\u6bcf\u4e00\u4f4d\u4ee3\u88681bit\uff09<\/code><\/pre>\n\n\n\n
\u7531\u6b64\u53ef\u4ee5\u5f97\u51fa\uff0cYUV444\u91c7\u6837\u65f6\u6bcf\u4e00\u4e2a\u50cf\u7d20\u5360\u75283\u4e2a\u5b57\u8282\u3002<\/p>\n\n\n\n
\u5728YUV422\u91c7\u6837\u4e2d\uff0c\u6bcf\u4e24\u4e2aY\u5206\u91cf\uff0c\u5bf9\u5e94\u4e00\u7ec4UV\u5206\u91cf\uff0c\u5176\u6392\u5217\u5f62\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n
YYYYYYYY UV UV UV UV \uff08\u6bcf\u4e00\u4f4d\u4ee3\u88681bit\uff09<\/code><\/pre>\n\n\n\n
\u7531\u6b64\u53ef\u4ee5\u5f97\u51fa\uff0c\u5728YUV422\u91c7\u6837\u65f6\uff0c\u6bcf\u4e2a\u50cf\u7d20\u70b9\u5360\u75282\u4e2a\u5b57\u8282\u3002<\/p>\n\n\n\n
\u5728YUV420\u91c7\u6837\u4e2d\uff0c\u6bcf\u56db\u4e2aY\u5206\u91cf\uff0c\u5bf9\u5e94\u4e00\u7ec4UV\u5206\u91cf\uff0c\u5176\u6392\u5217\u5f62\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n
YYYYYYYY UV UV<\/code><\/pre>\n\n\n\n
\u7531\u6b64\u53ef\u4ee5\u5f97\u51fa\uff0c\u5728YUV420\u91c7\u6837\u65f6\uff0c\u6bcf\u4e2a\u50cf\u7d20\u70b9\u5360\u75281.5\u4e2a\u5b57\u8282\u3002<\/p>\n\n\n\n
\u5728\u4e86\u89e3YUV\u7684\u91c7\u6837\u6a21\u5f0f\u540e\uff0c\u6211\u4eec\u9700\u8981\u4e86\u89e3\u4e00\u4e0bYUV\u8272\u5f69\u7a7a\u95f4\u4e0b\u7684\u6570\u636e\u683c\u5f0f\u547d\u540d\u89c4\u683c\uff0c\u8fd9\u4e00\u70b9\u5f88\u91cd\u8981\uff0c\u521d\u5b66\u8005\u5f88\u5bb9\u6613\u8ff7\u7cca\uff08\u5305\u62ec\u6211\uff09\u3002\u7b80\u5355\u6765\u8bb2\uff0c\u8fd9\u91cc\u5b58\u5728\u4e24\u79cd\u547d\u540d\u89c4\u683c\uff1a\u5e26Plane\u6a21\u578b\u4e0e\u4e0d\u5e26Plane\u6a21\u578b\u7684<\/strong>\u3002\u4e0d\u5e26Plane\u6a21\u578b\u5373\u662f\u666e\u901a\u7684YUV\u547d\u540d\u89c4\u5219\uff0c\u6709\u70b9\u7c7b\u4f3c\u4e8eRGBA\u8fd9\u79cd\u547d\u540d\u89c4\u5219\uff0c\u6bd4\u5982YUYV\uff0cYYUV\uff0cUYVY\u7b49\uff0c\u6b64\u65f6\u6bcf\u4e2a\u5206\u91cf\u4f9d\u6b21\u6392\u5217\u5b58\u50a8\uff08\u6ca1\u6709\u5206\u5f00\uff09\uff0c\u4ece\u547d\u540d\u5c31\u53ef\u4ee5\u5f88\u597d\u5730\u7406\u89e3\u5176\u5185\u5b58\u5206\u5e03\u5f62\u5f0f\u3002\u800c\u5e26Plane\u6a21\u578b\u7684\u5219\u4f1a\u590d\u6742\u8bb8\u591a\uff0c\u8fd9\u91cc\u6211\u4eec\u7b80\u5355\u8bb2\u89e3\u4e00\u4e2aPlane\u7684\u6982\u5ff5\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u7406\u89e3\u4e3a\u201c\u901a\u9053\u201d\u7684\u610f\u601d\u3002\u4e86\u89e3\u8fd9\u4e2a\u6982\u5ff5\u5f88\u91cd\u8981\uff0c\u56e0\u4e3aPlane\u4f1a\u5f71\u54cdYUV\u5404\u4e2a\u5206\u91cf\u5728\u6211\u4eec\u5185\u5b58\u5185\u7684\u5206\u5e03\u3002<\/p>\n\n\n\n
\u4e00\u822c\u800c\u8a00\uff0cYUV\u7684Plane\u5206\u4e3a\u4e24\u79cd\uff1aThree-Plane\u4e0eTwo-Plane\u6a21\u5f0f\u3002<\/p>\n\n\n\n
\u7b80\u5355\u8bb2\u4e00\u4e0bThree-Plane\u4e0eTwo-plane\u7684\u5dee\u522b\uff1aThree-Plane\u5176\u5b9e\u662f\u5c06Y,U,V\u5206\u91cf\u5206\u522b\u5b58\u50a8\uff08\u53ef\u4ee5\u7406\u89e3\u4e3aY,U,V\u6bcf\u4e2a\u5206\u91cf\u4e00\u4e2a\u901a\u9053\uff09\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
\u5982YUV422\u91c7\u6837\uff0cThree-Plane\u6a21\u5f0f\uff1a<\/p>\n\n\n\n
\/\/U\u5728\u524d,V\u5728\u540e\uff0c\u6bcf\u4e2a\u5206\u91cf\u5355\u72ec\u4e00\u4e2aPlane\nYYYYYYYY\nUUUU\nVVVV\n\/\/V\u5728\u524d,U\u5728\u540e\uff0c\u6bcf\u4e2a\u5206\u91cf\u5355\u72ec\u4e00\u4e2aPlane\nYYYYYYYY\nVVVV\nUUUU<\/code><\/pre>\n\n\n\n
\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u5728Three-Plane\u6a21\u5f0f\u4e0bYUV\u7684\u6bcf\u4e00\u7c7b\u5206\u91cf\u90fd\u662f\u5355\u72ec\u505a\u96c6\u4e2d\u5b58\u50a8\u7684\uff0c\u4e00\u822c\u6211\u4eec\u5c06Y\u5206\u91cf\u4f18\u5148\u5b58\u50a8\uff0c\u5176\u6b21\u5c06U,V\u5206\u522b\u5b58\u50a8\uff1b\u800cU\u5728\u524d\u4e0eV\u5728\u524d\u8fd9\u4e24\u79cd\u5f62\u5f0f\uff0c\u6700\u7ec8\u5728\u5185\u5b58\u7684\u5206\u5e03\u90fd\u662f\u4e0d\u4e00\u6837\u7684\u3002<\/p>\n\n\n\n
\u5728Two-Plane\u6a21\u5f0f\u4e0b\uff1a<\/p>\n\n\n\n
\/\/U\u5728\u524d,V\u5728\u540e\uff0cY\u4e0eUV\u5206\u91cf\u5355\u72ec\u4e00\u4e2aPlane\nYYYYYYYY\nUVUVUVUV\n\/\/V\u5728\u524d,U\u5728\u540e\uff0cY\u4e0eUV\u5206\u91cf\u5355\u72ec\u4e00\u4e2aPlane\nYYYYYYYY\nVUVUVUVU<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u5c06\u4f8b\u4e3e\u4e00\u4e9b\u6211\u4eec\u6bd4\u8f83\u5e38\u89c1\u7684YUV\u6570\u636e\u683c\u5f0f\u5e76\u6807\u8bb0\u51fa\u5bf9\u5e94\u7684\u91c7\u6837\u6a21\u5f0f\u4e0ePlane\u6a21\u578b\uff1a<\/p>\n\n\n\n
\u540d\u79f0<\/td>\u91c7\u6837\u7c7b\u578b<\/td>Plane\u6a21\u578b<\/td>\u5907\u6ce8<\/td><\/tr>
NV24<\/td>YUV444<\/td>Two-Plane <\/td>U\u5728\u524d\uff0cV\u5728\u540e<\/td><\/tr>
NV42<\/td>YUV444 <\/td>Two-Plane<\/td>V\u5728\u524d\uff0cU\u5728\u540e<\/td><\/tr>
I444<\/td>YUV444 <\/td>Three-Plane<\/td>Y\uff0cU\uff0cV\u4f9d\u6b21\u5206\u522b\u5b58\u50a8<\/td><\/tr>
NV16<\/td>YUV422<\/td>Two-Plane <\/td>U\u5728\u524d\uff0cV\u5728\u540e <\/td><\/tr>
NV61 <\/td>YUV422 <\/td>Two-Plane <\/td>V\u5728\u524d\uff0cU\u5728\u540e <\/td><\/tr>
I422<\/td>YUV422  <\/td>Three-Plane <\/td>Y\uff0cU\uff0cV\u4f9d\u6b21\u5206\u522b\u5b58\u50a8\uff1bY\u5206\u91cf\u53d6\u503c\u4e3a16~240<\/td><\/tr>
J422<\/td>YUV422  <\/td>Three-Plane <\/td>Y\uff0cU\uff0cV\u4f9d\u6b21\u5206\u522b\u5b58\u50a8 \uff1bY\u5206\u91cf\u53d6\u503c\u4e3a\u5b8c\u6574\u76840~255<\/td><\/tr>
NV12<\/td>YUV420<\/td>Two-Plane  <\/td>U\u5728\u524d\uff0cV\u5728\u540e <\/td><\/tr>
NV21<\/td>YUV420 <\/td>Two-Plane  <\/td>V\u5728\u524d\uff0cU\u5728\u540e <\/td><\/tr>
I420<\/td>YUV420 <\/td>Three-Plane  <\/td>Y\uff0cU\uff0cV\u4f9d\u6b21\u5206\u522b\u5b58\u50a8\uff1bY\u5206\u91cf\u53d6\u503c\u4e3a16~240 <\/td><\/tr>
J420<\/td>YUV420  <\/td>Three-Plane <\/td>Y\uff0cU\uff0cV\u4f9d\u6b21\u5206\u522b\u5b58\u50a8 \uff1bY\u5206\u91cf\u53d6\u503c\u4e3a\u5b8c\u6574\u76840~255 <\/td><\/tr>
YV12<\/td>YUV420  <\/td>Three-Plane <\/td>Y\uff0cU\uff0cV\u4f9d\u6b21\u5206\u522b\u5b58\u50a8\uff1bY\u5206\u91cf\u53d6\u503c\u4e3a16~240  <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u683c\u5f0f\u8f6c\u6362<\/h3>\n\n\n\n
\u5728\u4e86\u89e3\u4e0a\u8ff0\u57fa\u672c\u6982\u5ff5\u540e\uff0c\u6211\u4eec\u56de\u5230\u672c\u7bc7\u6587\u7ae0\u7684\u6838\u5fc3\u2014\u2014\u683c\u5f0f\u8f6c\u6362\u3002\u5176\u5b9e\u683c\u5f0f\u8f6c\u6362\u6838\u5fc3\u5c31\u4e24\u70b9\uff1a<\/p>\n\n\n\n
1.\u4e0d\u540c\u8272\u5f69\u7a7a\u95f4\u7684\u683c\u5f0f\u8f6c\u6362<\/p>\n\n\n\n
2.\u76f8\u540c\u8272\u5f69\u7a7a\u95f4\u4e0b\u5404\u5206\u91cf\u7684\u91cd\u65b0\u6392\u5217<\/p>\n\n\n\n
\u600e\u4e48\u53bb\u7406\u89e3\u8fd9\u4e24\u70b9\u5462\uff0c\u5982\u679c\u53c2\u4e0e\u683c\u5f0f\u8f6c\u6362\u7684\u4e24\u4e2a\u6570\u636e\u7c7b\u578b\u90fd\u662f\u540c\u4e00\u8272\u5f69\u7a7a\u95f4\u4e0b\u7684\u4e0d\u540c\u683c\u5f0f\uff0c\u90a3\u4e48\u7b2c\u4e00\u6b65\u8981\u505a\u7684\u5c31\u662f\u8272\u5f69\u7a7a\u95f4\u7684\u8f6c\u6362\uff0c\u8fd9\u90e8\u5206\u6709\u73b0\u6210\u7684\u516c\u5f0f\u53ef\u53c2\u8003\uff0c\u5177\u4f53\u7ec6\u8282\u4e0d\u5728\u6b64\u5904\u5c55\u5f00\uff0c\u76f4\u63a5\u7ed9\u51fa\u516c\u5f0f\uff1a<\/p>\n\n\n\n
\/\/From RGB To YUV\nY =  0.299R + 0.587G + 0.114B\nU = -0.147R - 0.289G + 0.436B\nV =  0.615R - 0.515G - 0.100B\n\/\/From YUV To RGB\nR = Y + 1.140V\nG = Y - 0.395U - 0.581V\nB = Y + 2.032U<\/code><\/pre>\n\n\n\n
\u6839\u636e\u516c\u5f0f\u6211\u4eec\u53ef\u4ee5\u5199\u51fa\u76f8\u5e94\u7684\u683c\u5f0f\u7a7a\u95f4\u8f6c\u6362\u683c\u5f0f\uff08YUV To RGB\uff09:<\/p>\n\n\n\n
static inline float clamp(float v, float min, float max)\n{\n    if (v < min)\n        return min;\n    if (v > max)\n        return max;\n    return v;\n}\n\nstatic uint32_t yuvToRgbx(const unsigned char Y, const unsigned char Uin, const unsigned char Vin)\n{\n    float U = Uin - 128.0f;\n    float V = Vin - 128.0f;\n\n    float Rf = Y + 1.140f * V;\n    float Gf = Y - 0.395f * U - 0.581f * V;\n    float Bf = Y + 2.032f * U;\n    unsigned char R = (unsigned char)clamp(Rf, 0.0f, 255.0f);\n    unsigned char G = (unsigned char)clamp(Gf, 0.0f, 255.0f);\n    unsigned char B = (unsigned char)clamp(Bf, 0.0f, 255.0f);\n\n    return (R) | (G << 8) | (B << 16) | 0xFF000000; \n}<\/code><\/pre>\n\n\n\n
\u80af\u5b9a\u6709\u670b\u53cb\u6ce8\u610f\u5230\u4e86\u6b64\u5904\u5728\u8f6c\u6362\u65f6\u5f15\u5165\u4e86\u4e00\u4e2a\u5e38\u91cf128.0f\uff0c\u8fd9\u5728\u516c\u5f0f\u4e2d\u5e76\u672a\u63d0\u53ca\uff0c\u8fd9\u662f\u4e3a\u4e86\u907f\u514d\u5728\u683c\u5f0f\u8f6c\u6362\u8fc7\u7a0b\u4e2d\u5f15\u5165\u8bef\u5dee\uff0c\u5173\u4e8e\u8fd9\u90e8\u5206\u8bf4\u660e\u53ef\u4ee5\u53c2\u8003Link<\/a>\u3002<\/p>\n\n\n\n
\u5728\u76f8\u540c\u8272\u5f69\u7a7a\u95f4\u7684\u57fa\u7840\u4e0b\uff0c\u4e0d\u540c\u7684\u6570\u636e\u683c\u5f0f\u76f8\u5bf9\u6765\u8bf4\u5c31\u6bd4\u8f83\u7b80\u5355\u4e86\uff0c\u5176\u5b9e\u5c31\u662f\u5404\u5206\u91cf\u7684\u91cd\u65b0\u6392\u5217\uff0c\u5982NV21\u4e0eNV12\u7684\u8f6c\u6362\u90a3\u4e48\u5c31\u662f\u8bb2UV\u5206\u91cf\u7684\u6392\u5217\u8c03\u6574\u4e3a\u671f\u5f85\u503c\u5373\u53ef\u3002\u6240\u4ee5\u4e86\u89e3\u5404\u79cd\u6570\u636e\u683c\u5f0f\u7684\u5185\u5b58\u6392\u5217\u5f62\u5f0f\u5f88\u91cd\u8981\u3002<\/p>\n\n\n\n
\u5728\u6211\u4eec\u4f7f\u7528libyuv\u5e93\u6765\u5b8c\u6210\u6570\u636e\u683c\u5f0f\u8f6c\u6362\u65f6\uff0c\u6211\u4eec\u9700\u8981\u8fdb\u884c\u76f8\u5e94\u7684\u4e00\u4e9b\u914d\u7f6e\uff1a<\/p>\n\n\n\n
1.mk\u6216\u8005bp\u6587\u4ef6\u5185\u5bfc\u5165libyuv\uff0c\u4ee5bp\u4e3a\u4f8b\uff1a<\/p>\n\n\n\n
    shared_libs: [\n        ...\n        \"libEGL\",\n        \"libGLESv2\",\n        \"libyuv\",\n        \"liblog\",\n         ...\n    ],<\/code><\/pre>\n\n\n\n
2.\u5934\u6587\u4ef6\u5f15\u5165#include <libyuv.h><\/p>\n\n\n\n
\u8fd9\u91cc\u5c06\u4e3e\u4f8b\u8bf4\u660e\uff0c\u5c06YUYV\uff08\u4e0d\u5e26Plane\u6a21\u578b\uff09\u7684\u6570\u636e\u683c\u5f0f\u8f6c\u6362\u4e3aRGBA\u683c\u5f0f\uff1a<\/p>\n\n\n\n
void fillRGBAFromYUYV(\n\n             const BufferDesc& tgtBuff,\n\n             uint8_t* tgt,\n             void* imgData,\n             void* buf,\n             unsigned imgStride)\n{\nconst auto srcStrideInBytes = imgStride * 2;\nconst auto dstStrideInBytes = pDesc->stride * 4;\n    \/\/ \u8272\u5f69\u7a7a\u95f4\u8f6c\u6362\nauto result = libyuv::YUY2ToARGB((const uint8_t*)imgData,\n                                     srcStrideInBytes, \n                                     (uint8_t*)buf,\n                                     dstStrideInBytes, \n                                     pDesc->width,\n                                     pDesc->height);\nif (result)\n  {\n      ALOGE(\"Failed to convert YUYV to BGRA\");\n      return;\n}\n\n\nresult = libyuv::ABGRToARGB((uint8_t*)buf, dstStrideInBytes, tgt, dstStrideInBytes,\npDesc->width, pDesc->height);\nif (result)\n  {\n      ALOGE(\"Failed to convert BGRA to RGBA\");\n   }\n}<\/code><\/pre>\n\n\n\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0ctgtBuffer\u4e3a\u6211\u4eec\u6570\u636e\u683c\u5f0f\u7684\u6700\u7ec8\u53bb\u5411\uff0c\u53d6\u5176\u5bbd\u3001\u9ad8\u4e0eStride\u53c2\u6570\uff0c\u7528\u4e8e\u8ba1\u7b97\u5355\u884c\u6709\u6548\u6570\u636e\u7684\u5b57\u8282\u6570\u3002imgData\u4e3a\u539f\u59cb\u7684\u6570\u636ebuffer,buf\u7528\u4e8e\u5b58\u50a8\u8fdb\u884c\u8272\u5f69\u7a7a\u95f4\u53d8\u6362\u540e\u7684\u6570\u636e\uff0ctgt\u624d\u4ee3\u8868\u6211\u4eec\u6700\u7ec8\u8f6c\u6362\u540e\u7684\u6570\u636e\u5730\u5740\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u8c03\u7528\u4e86libyuv\u7684\u4e24\u4e2a\u51fd\u6570\uff1a<\/p>\n\n\n\n
1. libyuv::YUY2ToARG\uff0c\u8be5\u51fd\u6570\u5176\u5b9e\u662f\u5c06\u6211\u4eec\u7684\u6570\u636e\u4eceYUV\u8272\u5f69\u7a7a\u95f4\u8f6c\u6362\u5230\u4e86RGB\u7a7a\u95f4\uff0c\u5728RGB\u7a7a\u95f4\u5185\u7684\u6570\u636e\u683c\u5f0f\u4e3aBGRA\uff08\u8fd9\u662f\u56e0\u4e3alibyuv\u662f\u5c0f\u7aef\u6a21\u5f0f\uff0c\u800cAndroid\u5185\u7684RGBA\u4e3a\u5927\u7aef\uff09<\/p>\n\n\n\n
2. libyuv::ABGRToARGB \uff0c\u8f6c\u6362\u5927\u5c0f\u7aef\uff0c\u8c03\u6574\u5404\u5206\u91cf\u6b21\u5e8f<\/p>\n\n\n\n
\u4e0d\u8fc7\u5f53\u524d\u6211\u5bf9libyuv\u7684\u4e86\u89e3\u4ec5\u9650\u4e8e\u5982\u4f55\u4f7f\u7528\u800c\u5df2\uff0c\u540e\u9762\u6709\u673a\u4f1a\u518d\u8fdb\u884c\u66f4\u4e3a\u6df1\u5165\u7684\u4e86\u89e3\u3002<\/p>\n        
\n            
\n                \n                
\n                    \n                        \"Happy\"\n                    <\/a>\n                    
\n                        Happy                    <\/div>\n                    
\n                                                    1<\/span>\n                        \n                                                100<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sad\"\n                    <\/a>\n                    
\n                        Sad                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Excited\"\n                    <\/a>\n                    
\n                        Excited                    <\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Sleepy\"\n                    <\/a>\n                    
\n                        Sleepy                    <\/div>\n                    
\n                                                    0<\/span>\n                        \n                                                0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Angry\"\n                    <\/a>\n                    
Angry<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                        \n                    <\/div>\n                <\/div>\n\n                
\n                    \n                        \"Surprise\"\n                    <\/a>\n                    
Surprise<\/div>\n                    
\n                                                    0<\/span>\n                                                                        0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n            <\/div>\n        <\/div>","protected":false},"excerpt":{"rendered":"
Android Native\u4e2d\u4f7f\u7528libyuv\u8fdb\u884c\u6570\u636e\u683c\u5f0f\u8f6c\u6362\u7684\u4e00\u4e9b\u77e5\u8bc6\u8bb0\u5f55<\/p>","protected":false},"author":1,"featured_media":3796,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":1,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[18],"tags":[46,66],"class_list":["post-4281","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-operating-system","tag-android","tag-camera"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[]}},"aioseo_notices":[],"featured_image_urls":{"full":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1.png",1200,787,false],"thumbnail":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1-150x150.png",150,150,true],"medium":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1-300x197.png",300,197,true],"medium_large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1-768x504.png",768,504,true],"large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1-1024x672.png",1024,672,true],"1536x1536":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1.png",1200,787,false],"2048x2048":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1.png",1200,787,false],"trp-custom-language-flag":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1-18x12.png",18,12,true]},"post_excerpt_stackable":"
Android Native\u4e2d\u4f7f\u7528libyuv\u8fdb\u884c\u6570\u636e\u683c\u5f0f\u8f6c\u6362\u7684\u4e00\u4e9b\u77e5\u8bc6\u8bb0\u5f55<\/p>\n","category_list":"\u64cd\u4f5c\u7cfb\u7edf<\/a>","author_info":{"name":"FranzKafka95","url":"https:\/\/blog.coderfan.org\/en\/author\/yushenglonely95"},"comments_num":"0 comments","featured_image_urls_v2":{"full":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1.png",1200,787,false],"thumbnail":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1-150x150.png",150,150,true],"medium":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1-300x197.png",300,197,true],"medium_large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1-768x504.png",768,504,true],"large":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1-1024x672.png",1024,672,true],"1536x1536":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1.png",1200,787,false],"2048x2048":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1.png",1200,787,false],"trp-custom-language-flag":["https:\/\/blog.coderfan.org\/wp-content\/uploads\/2022\/02\/best-android-camera-1-18x12.png",18,12,true]},"post_excerpt_stackable_v2":"
Android Native\u4e2d\u4f7f\u7528libyuv\u8fdb\u884c\u6570\u636e\u683c\u5f0f\u8f6c\u6362\u7684\u4e00\u4e9b\u77e5\u8bc6\u8bb0\u5f55<\/p>\n","category_list_v2":"\u64cd\u4f5c\u7cfb\u7edf<\/a>","author_info_v2":{"name":"FranzKafka95","url":"https:\/\/blog.coderfan.org\/en\/author\/yushenglonely95"},"comments_num_v2":"0 comments","_links":{"self":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/4281","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/comments?post=4281"}],"version-history":[{"count":42,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/4281\/revisions"}],"predecessor-version":[{"id":4414,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/posts\/4281\/revisions\/4414"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/media\/3796"}],"wp:attachment":[{"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/media?parent=4281"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/categories?post=4281"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.coderfan.org\/en\/wp-json\/wp\/v2\/tags?post=4281"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}