{"id":91326,"date":"2026-08-07T17:18:04","date_gmt":"2026-08-07T09:18:04","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/91326.html"},"modified":"2026-08-07T17:18:04","modified_gmt":"2026-08-07T09:18:04","slug":"ffmpeg-%e5%83%8f%e7%b4%a0%e6%a0%bc%e5%bc%8f%e8%bd%ac%e6%8d%a2%e4%b8%8e%e5%9b%be%e5%83%8f%e7%bc%a9%e6%94%be%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/91326.html","title":{"rendered":"FFmpeg \u50cf\u7d20\u683c\u5f0f\u8f6c\u6362\u4e0e\u56fe\u50cf\u7f29\u653e\u5b9e\u6218"},"content":{"rendered":"<\/p>\n<h4>\u76ee\u5f55<\/h4>\n<ul>\n<li>1. sws_getContext<\/li>\n<li>2. sws_scale<\/li>\n<li>3. \u7f16\u7801\u6d41\u7a0b<\/li>\n<li>\n<ul>\n<li>3.1 \u6253\u5f00\u89c6\u9891\u6587\u4ef6<\/li>\n<li>3.2 \u521d\u59cb\u5316\u89e3\u7801\u5668<\/li>\n<li>3.3 \u521d\u59cb\u5316\u97f3\u89c6\u9891\u7801\u6d41\u89e3\u6790\u5668<\/li>\n<li>3.4 \u521d\u59cb\u5316SDL\u90e8\u5206<\/li>\n<li>3.5 \u521d\u59cb\u5316\u56fe\u50cf\u8f6c\u6362\u4e0a\u4e0b\u6587<\/li>\n<li>3.6 \u8bfb\u53d6\u6587\u4ef6\u6570\u636e<\/li>\n<li>3.7 \u89e3\u6790\u97f3\u89c6\u9891\u88f8\u6d41\u6570\u636e<\/li>\n<li>3.8 \u89e3\u7801<\/li>\n<li>3.9 \u50cf\u7d20\u683c\u5f0f\u8f6c\u6362<\/li>\n<li>3.10 SDL\u6e32\u67d3<\/li>\n<li>3.11 \u51b2\u5237\u89e3\u7801\u5668<\/li>\n<li>3.12 \u5185\u5b58\u56de\u6536<\/li>\n<\/ul>\n<\/li>\n<li>4. \u4ee3\u7801\u5408\u96c6<\/li>\n<li>5. \u89c6\u9891\u6548\u679c\u622a\u56fe<\/li>\n<li>6. \u8fdb\u9636<\/li>\n<li>\n<ul>\n<li>6.1 \u5b9e\u73b0\u6e90\u7801<\/li>\n<li>6.2 \u8fd0\u884c\u622a\u56fe<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u5728ffmpeg\u4e2d\u5982\u679c\u9700\u8981\u4fee\u6539\u56fe\u50cf\u7684\u50cf\u7d20\u683c\u5f0f&#xff0c;\u6216\u8005\u4fee\u6539\u56fe\u50cf\u7684\u5bbd\u9ad8\u5927\u5c0f&#xff0c;\u6700\u7b80\u5355\u7684\u5c31\u662f\u4f7f\u7528sws_scale\u51fd\u6570\u8fdb\u884c\u8f6c\u6362&#xff01;<\/p>\n<p>\u5148\u524d\u5b66\u4e60\u4e86ffmpeg\u7684 \u7f16\u7801 \u548c \u89e3\u7801 \u64cd\u4f5c&#xff0c;\u57fa\u4e8e\u6b64&#xff0c;\u518d\u6765\u4e86\u89e3\u4e00\u4e0b\u50cf\u7d20\u683c\u5f0f\u7684\u8f6c\u6362&#xff01;<\/p>\n<p>\u8c03\u7528\u6d41\u7a0b&#xff1a;<\/p>\n<p><span class=\"token function\">sws_getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>  \u2192  \u521d\u59cb\u5316\u8f6c\u6362\u4e0a\u4e0b\u6587&#xff08;\u53ea\u8c03\u7528\u4e00\u6b21&#xff09;<br \/>\n       \u2193<br \/>\n<span class=\"token function\">sws_scale<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>       \u2192  \u6267\u884c\u5b9e\u9645\u8f6c\u6362&#xff08;\u6bcf\u5e27\u8c03\u7528&#xff09;<br \/>\n       \u2193<br \/>\n<span class=\"token function\">sws_freeContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> \u2192  \u91ca\u653e\u4e0a\u4e0b\u6587&#xff08;\u7ed3\u675f\u65f6\u8c03\u7528&#xff09;<\/p>\n<p>\u8fd0\u7528\u6d41\u7a0b&#xff1a;<\/p>\n<p>    \u89e3\u6790\u51fa\u4e00\u5e27              \u53d1\u9001\u89e3\u7801                \u63a5\u6536\u89e3\u7801            \u50cf\u7d20\u683c\u5f0f\u8f6c\u6362<br \/>\n<span class=\"token function\">av_parser_parse2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> \u2192 <span class=\"token function\">avcodec_send_packet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> \u2192 <span class=\"token function\">avcodec_receive_frame<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> \u2192 <span class=\"token function\">sws_scale<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h2>1. sws_getContext<\/h2>\n<p>sws_getContext \u662f FFmpeg \u7684 libswscale \u5e93\u4e2d\u7528\u4e8e\u521d\u59cb\u5316\u56fe\u50cf\u8f6c\u6362\u4e0a\u4e0b\u6587\u7684\u6838\u5fc3\u51fd\u6570\u3002\u5b83\u7684\u4e3b\u8981\u4efb\u52a1\u662f\u521b\u5efa\u4e00\u4e2a SwsContext \u7ed3\u6784\u4f53\u3002<\/p>\n<p>\u2460\u51fd\u6570\u539f\u578b<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">SwsContext<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">sws_getContext<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> srcW<span class=\"token punctuation\">,<\/span>                   <span class=\"token comment\">\/\/ \u6e90\u56fe\u50cf\u5bbd\u5ea6<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> srcH<span class=\"token punctuation\">,<\/span>                   <span class=\"token comment\">\/\/ \u6e90\u56fe\u50cf\u9ad8\u5ea6<\/span><br \/>\n    <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">AVPixelFormat<\/span> srcFormat<span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u6e90\u50cf\u7d20\u683c\u5f0f<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> dstW<span class=\"token punctuation\">,<\/span>                   <span class=\"token comment\">\/\/ \u76ee\u6807\u5bbd\u5ea6<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> dstH<span class=\"token punctuation\">,<\/span>                   <span class=\"token comment\">\/\/ \u76ee\u6807\u9ad8\u5ea6<\/span><br \/>\n    <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">AVPixelFormat<\/span> dstFormat<span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u76ee\u6807\u50cf\u7d20\u683c\u5f0f<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> flags<span class=\"token punctuation\">,<\/span>                  <span class=\"token comment\">\/\/ \u7f29\u653e\u7b97\u6cd5\u6807\u5fd7<\/span><br \/>\n    SwsFilter <span class=\"token operator\">*<\/span>srcFilter<span class=\"token punctuation\">,<\/span>       <span class=\"token comment\">\/\/ \u6e90\u6ee4\u6ce2\u5668&#xff08;\u901a\u5e38 NULL&#xff09;<\/span><br \/>\n    SwsFilter <span class=\"token operator\">*<\/span>dstFilter<span class=\"token punctuation\">,<\/span>       <span class=\"token comment\">\/\/ \u76ee\u6807\u6ee4\u6ce2\u5668&#xff08;\u901a\u5e38 NULL&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">double<\/span> <span class=\"token operator\">*<\/span>param         <span class=\"token comment\">\/\/ \u7b97\u6cd5\u53c2\u6570&#xff08;\u901a\u5e38 NULL&#xff09;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u2461\u53c2\u6570\u8bf4\u660e<\/p>\n<table>\n<tr>\u53c2\u6570\u7c7b\u578b\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>srcW<\/td>\n<td>int<\/td>\n<td>\u6e90\u56fe\u50cf\u5bbd\u5ea6&#xff08;\u50cf\u7d20&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>srcH<\/td>\n<td>int<\/td>\n<td>\u6e90\u56fe\u50cf\u9ad8\u5ea6&#xff08;\u50cf\u7d20&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>srcFormat<\/td>\n<td>enum AVPixelFormat<\/td>\n<td>\u6e90\u50cf\u7d20\u683c\u5f0f&#xff08;\u5982 AV_PIX_FMT_YUV420P\u3001AV_PIX_FMT_RGB24&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>dstW<\/td>\n<td>int<\/td>\n<td>\u76ee\u6807\u56fe\u50cf\u5bbd\u5ea6&#xff08;\u50cf\u7d20&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>dstH<\/td>\n<td>int<\/td>\n<td>\u76ee\u6807\u56fe\u50cf\u9ad8\u5ea6&#xff08;\u50cf\u7d20&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>dstFormat<\/td>\n<td>enum AVPixelFormat<\/td>\n<td>\u76ee\u6807\u50cf\u7d20\u683c\u5f0f&#xff08;\u5982 AV_PIX_FMT_YUV420P\u3001AV_PIX_FMT_RGB24&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>flags<\/td>\n<td>int<\/td>\n<td>\u7f29\u653e\u7b97\u6cd5\u6807\u5fd7&#xff08;\u5982 SWS_BILINEAR\u3001SWS_BICUBIC\u3001SWS_LANCZOS&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>srcFilter<\/td>\n<td>SwsFilter *<\/td>\n<td>\u6e90\u6ee4\u6ce2\u5668&#xff0c;\u4e00\u822c\u4e0d\u7528&#xff0c;\u586b NULL<\/td>\n<\/tr>\n<tr>\n<td>dstFilter<\/td>\n<td>SwsFilter *<\/td>\n<td>\u76ee\u6807\u6ee4\u6ce2\u5668&#xff0c;\u4e00\u822c\u4e0d\u7528&#xff0c;\u586b NULL<\/td>\n<\/tr>\n<tr>\n<td>param<\/td>\n<td>const double *<\/td>\n<td>\u7b97\u6cd5\u53c2\u6570&#xff0c;\u4e00\u822c\u4e0d\u7528&#xff0c;\u586b NULL<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5e38\u7528 flags \u7b97\u6cd5<\/p>\n<table>\n<tr>\u6807\u5fd7\u8bf4\u660e\u901f\u5ea6\/\u8d28\u91cf<\/tr>\n<tbody>\n<tr>\n<td>SWS_FAST_BILINEAR<\/td>\n<td>\u5feb\u901f\u53cc\u7ebf\u6027<\/td>\n<td>\u5feb&#xff0c;\u8d28\u91cf\u5c1a\u53ef<\/td>\n<\/tr>\n<tr>\n<td>SWS_BILINEAR<\/td>\n<td>\u53cc\u7ebf\u6027<\/td>\n<td>\u4e2d\u7b49<\/td>\n<\/tr>\n<tr>\n<td>SWS_BICUBIC<\/td>\n<td>\u53cc\u4e09\u6b21<\/td>\n<td>\u8f83\u6162&#xff0c;\u8d28\u91cf\u597d<\/td>\n<\/tr>\n<tr>\n<td>SWS_LANCZOS<\/td>\n<td>Lanczos<\/td>\n<td>\u6162&#xff0c;\u8d28\u91cf\u6700\u597d<\/td>\n<\/tr>\n<tr>\n<td>SWS_POINT<\/td>\n<td>\u6700\u8fd1\u90bb<\/td>\n<td>\u6700\u5feb&#xff0c;\u7f29\u653e\u65f6\u7528<\/td>\n<\/tr>\n<tr>\n<td>SWS_AREA<\/td>\n<td>\u9762\u79ef\u6cd5\u7f29\u5c0f<\/td>\n<td>\u7f29\u5c0f\u56fe\u7247\u63a8\u8350<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u2462\u8fd4\u56de\u503c<\/p>\n<ul>\n<li>\u6210\u529f&#xff1a;\u8fd4\u56de\u4e00\u4e2a\u6307\u5411 SwsContext \u7ed3\u6784\u4f53\u7684\u6307\u9488<\/li>\n<li>\u5931\u8d25&#xff1a;\u8fd4\u56de NULL<\/li>\n<\/ul>\n<p>\u2463\u4f7f\u7528\u793a\u4f8b<\/p>\n<p><span class=\"token comment\">\/\/ yuv420\u8f6crgb24<\/span><br \/>\nSwsContext <span class=\"token operator\">*<\/span>sws_ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">sws_getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">800<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">600<\/span><span class=\"token punctuation\">,<\/span> AV_PIX_FMT_YUV420P<span class=\"token punctuation\">,<\/span>          <span class=\"token comment\">\/\/ \u6e90\u683c\u5f0f<\/span><br \/>\n                                     <span class=\"token number\">640<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">,<\/span> AV_PIX_FMT_RGB24<span class=\"token punctuation\">,<\/span>            <span class=\"token comment\">\/\/ \u76ee\u6807\u683c\u5f0f<\/span><br \/>\n                                     SWS_BILINEAR<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ SWS_BILINEAR \u53cc\u7ebf\u6027\u63d2\u503c\u7b97\u6cd5<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>sws_ctx<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;sws_getContext failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>2. sws_scale<\/h2>\n<p>\u4f7f\u7528 sws_getContext \u521b\u5efa\u7684\u4e0a\u4e0b\u6587&#xff0c;\u5c06\u6e90\u56fe\u50cf\u6570\u636e\u8f6c\u6362\u4e3a\u76ee\u6807\u56fe\u50cf\u6570\u636e\u3002<\/p>\n<p>\u2460\u51fd\u6570\u539f\u578b<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">sws_scale<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">SwsContext<\/span> <span class=\"token operator\">*<\/span>c<span class=\"token punctuation\">,<\/span>               <span class=\"token comment\">\/\/ \u4e0a\u4e0b\u6587<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">uint8_t<\/span> <span class=\"token operator\">*<\/span><span class=\"token keyword\">const<\/span> srcSlice<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>   <span class=\"token comment\">\/\/ \u6e90\u6570\u636e\u6307\u9488\u6570\u7ec4<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> srcStride<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>             <span class=\"token comment\">\/\/ \u6e90\u6bcf\u884c\u5b57\u8282\u6570&#xff08;linesize&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> srcSliceY<span class=\"token punctuation\">,<\/span>                     <span class=\"token comment\">\/\/ \u4ece\u7b2c\u51e0\u884c\u5f00\u59cb\u5904\u7406<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> srcSliceH<span class=\"token punctuation\">,<\/span>                     <span class=\"token comment\">\/\/ \u5904\u7406\u591a\u5c11\u884c<\/span><br \/>\n    <span class=\"token keyword\">uint8_t<\/span> <span class=\"token operator\">*<\/span><span class=\"token keyword\">const<\/span> dst<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>              <span class=\"token comment\">\/\/ \u76ee\u6807\u6570\u636e\u6307\u9488\u6570\u7ec4<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> dstStride<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span>              <span class=\"token comment\">\/\/ \u76ee\u6807\u6bcf\u884c\u5b57\u8282\u6570<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u2461\u53c2\u6570\u8bf4\u660e<\/p>\n<table>\n<tr>\u53c2\u6570\u7c7b\u578b\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>c<\/td>\n<td>SwsContext *<\/td>\n<td>\u7531 sws_getContext \u521b\u5efa\u7684\u8f6c\u6362\u4e0a\u4e0b\u6587<\/td>\n<\/tr>\n<tr>\n<td>srcSlice[]<\/td>\n<td>const uint8_t *const []<\/td>\n<td>\u6e90\u56fe\u50cf\u5404\u5e73\u9762\u6570\u636e\u6307\u9488\u6570\u7ec4&#xff08;\u5bf9\u5e94 frame-&gt;data[]&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>srcStride[]<\/td>\n<td>const int []<\/td>\n<td>\u6e90\u5404\u5e73\u9762\u6bcf\u884c\u5b57\u8282\u6570&#xff08;\u5bf9\u5e94 frame-&gt;linesize[]&#xff0c;\u6ce8\u610f\u662f\u5b57\u8282\u4e0d\u662f\u50cf\u7d20&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>srcSliceY<\/td>\n<td>int<\/td>\n<td>\u4ece\u6e90\u56fe\u50cf\u7684\u7b2c\u51e0\u884c\u5f00\u59cb\u5904\u7406&#xff08;\u901a\u5e38\u586b 0&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>srcSliceH<\/td>\n<td>int<\/td>\n<td>\u4ece\u6e90\u56fe\u50cf\u5904\u7406\u591a\u5c11\u884c&#xff08;\u901a\u5e38\u586b srcH&#xff0c;\u5373\u5168\u90e8&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>dst[]<\/td>\n<td>uint8_t *const []<\/td>\n<td>\u76ee\u6807\u56fe\u50cf\u5404\u5e73\u9762\u6570\u636e\u6307\u9488\u6570\u7ec4&#xff08;\u5bf9\u5e94 dst_frame-&gt;data[]&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>dstStride[]<\/td>\n<td>const int []<\/td>\n<td>\u76ee\u6807\u5404\u5e73\u9762\u6bcf\u884c\u5b57\u8282\u6570&#xff08;\u5bf9\u5e94 dst_frame-&gt;linesize[]&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u2462\u8fd4\u56de\u503c<\/p>\n<ul>\n<li>\u6210\u529f&#xff1a;\u8fd4\u56de\u8f93\u51fa\u7684\u884c\u6570<\/li>\n<li>\u5931\u8d25&#xff1a;\u8fd4\u56de\u4e00\u4e2a\u8d1f\u6570\u9519\u8bef\u7801<\/li>\n<\/ul>\n<p>\u2463\u4f7f\u7528\u793a\u4f8b \u76ee\u6807\u63a5\u6536\u7684frame_rgb24&#xff0c;\u9700\u8981\u7531\u4f7f\u7528\u8005\u5206\u914d\u5185\u5b58&#xff1b;<\/p>\n<p><span class=\"token comment\">\/\/ \u5b9a\u4e49\u5e76\u4e14\u5206\u914d\u5185\u5b58&#xff0c;\u7528\u4e8e\u63a5\u6536\u8f6c\u6362\u540e\u7684\u4e00\u5e27\u56fe\u50cf<\/span><br \/>\nAVFrame <span class=\"token operator\">*<\/span>frame_rgb24 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_frame_alloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nframe_rgb24<span class=\"token operator\">-&gt;<\/span>width <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">640<\/span><span class=\"token punctuation\">;<\/span><br \/>\nframe_rgb24<span class=\"token operator\">-&gt;<\/span>height <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">;<\/span><br \/>\nframe_rgb24<span class=\"token operator\">-&gt;<\/span>format <span class=\"token operator\">&#061;<\/span> AV_PIX_FMT_RGB24<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">av_frame_get_buffer<\/span><span class=\"token punctuation\">(<\/span>frame_rgb24<span class=\"token punctuation\">,<\/span> <span class=\"token number\">32<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ \u5206\u914d\u5185\u5b58<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u50cf\u7d20\u683c\u5f0f\u8f6c\u6362<\/span><br \/>\n<span class=\"token keyword\">int<\/span> height <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">sws_scale<\/span><span class=\"token punctuation\">(<\/span>sws_ctx<span class=\"token punctuation\">,<\/span>                          <span class=\"token comment\">\/\/ \u7531 sws_getContext \u521b\u5efa\u7684 SwsContext \u6307\u9488<\/span><br \/>\n                       frame<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span>                      <span class=\"token comment\">\/\/ \u6e90\u56fe\u50cf\u6570\u636e\u6307\u9488\u6570\u7ec4<\/span><br \/>\n                       frame<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">,<\/span>                  <span class=\"token comment\">\/\/ \u6e90\u56fe\u50cf\u6bcf\u884c\u7684\u5b57\u8282\u6570<\/span><br \/>\n                       <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>                                <span class=\"token comment\">\/\/ \u5904\u7406\u8d77\u59cb\u884c&#xff0c;\u901a\u5e38\u4e3a 0&#xff0c;\u8868\u793a\u4ece\u7b2c\u4e00\u884c\u5f00\u59cb<\/span><br \/>\n                       frame<span class=\"token operator\">-&gt;<\/span>height<span class=\"token punctuation\">,<\/span>                    <span class=\"token comment\">\/\/ \u8981\u5904\u7406\u7684\u884c\u6570&#xff0c;\u901a\u5e38\u4e3a\u6e90\u56fe\u50cf\u7684\u9ad8\u5ea6<\/span><br \/>\n                       frame_rgb24<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span>                <span class=\"token comment\">\/\/ \u76ee\u6807\u56fe\u50cf\u6570\u636e\u6307\u9488\u6570\u7ec4<\/span><br \/>\n                       frame_rgb24<span class=\"token operator\">-&gt;<\/span>linesize             <span class=\"token comment\">\/\/ \u76ee\u6807\u56fe\u50cf\u6bcf\u884c\u7684\u5b57\u8282\u6570<\/span><br \/>\n             <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;<\/span> height<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;sws_scale failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>3. \u7f16\u7801\u6d41\u7a0b<\/h2>\n<h3>3.1 \u6253\u5f00\u89c6\u9891\u6587\u4ef6<\/h3>\n<p>std<span class=\"token double-colon punctuation\">::<\/span>ifstream ifs<span class=\"token punctuation\">;<\/span><br \/>\nifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;800_600_25.h264&#034;<\/span><span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>ios<span class=\"token double-colon punctuation\">::<\/span>binary<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">is_open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;ifs open file failed!\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Error code: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Error message: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.2 \u521d\u59cb\u5316\u89e3\u7801\u5668<\/h3>\n<p><span class=\"token comment\">\/\/ \u67e5\u627e\u89e3\u7801\u5668<\/span><br \/>\n<span class=\"token keyword\">const<\/span> AVCodec <span class=\"token operator\">*<\/span>decodec <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_find_decoder<\/span><span class=\"token punctuation\">(<\/span>AV_CODEC_ID_H264<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>decodec<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_find_decoder failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u521b\u5efa\u89e3\u7801\u5668\u4e0a\u4e0b\u6587<\/span><br \/>\nAVCodecContext <span class=\"token operator\">*<\/span>decodec_ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_alloc_context3<\/span><span class=\"token punctuation\">(<\/span>decodec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>decodec_ctx<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_alloc_context3 failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6253\u5f00\u89e3\u7801\u5668\u4e0a\u4e0b\u6587<\/span><br \/>\n<span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_open2<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> decodec<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">!&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_open2 failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.3 \u521d\u59cb\u5316\u97f3\u89c6\u9891\u7801\u6d41\u89e3\u6790\u5668<\/h3>\n<p>AVCodecParserContext <span class=\"token operator\">*<\/span>parser_ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_parser_init<\/span><span class=\"token punctuation\">(<\/span>AV_CODEC_ID_H264<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>parser_ctx<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;av_parser_init failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.4 \u521d\u59cb\u5316SDL\u90e8\u5206<\/h3>\n<p><span class=\"token function\">SDL_Init<\/span><span class=\"token punctuation\">(<\/span>SDL_INIT_VIDEO<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u521b\u5efa\u7a97\u53e3<\/span><br \/>\nSDL_Window <span class=\"token operator\">*<\/span>sdl_win <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">SDL_CreateWindow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;xxxxxxxx&#034;<\/span><span class=\"token punctuation\">,<\/span> SDL_WINDOWPOS_UNDEFINED<span class=\"token punctuation\">,<\/span> SDL_WINDOWPOS_UNDEFINED<span class=\"token punctuation\">,<\/span><br \/>\n                                       <span class=\"token number\">640<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">,<\/span> SDL_WINDOW_OPENGL<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u521b\u5efa\u6e32\u67d3\u5668<\/span><br \/>\nSDL_Renderer <span class=\"token operator\">*<\/span>render <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">SDL_CreateRenderer<\/span><span class=\"token punctuation\">(<\/span>sdl_win<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> SDL_RENDERER_TARGETTEXTURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u521b\u5efa \u7eb9\u7406|\u6750\u8d28<\/span><br \/>\nSDL_Texture <span class=\"token operator\">*<\/span>texture <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">SDL_CreateTexture<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">,<\/span> SDL_PIXELFORMAT_RGB24<span class=\"token punctuation\">,<\/span> SDL_TEXTUREACCESS_STREAMING<span class=\"token punctuation\">,<\/span><br \/>\n                                         <span class=\"token number\">640<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8bbe\u7f6e\u7ebf\u6027\u63d2\u503c&#xff08;\u6297\u952f\u9f7f&#xff09;<\/span><br \/>\n<span class=\"token function\">SDL_SetTextureScaleMode<\/span><span class=\"token punctuation\">(<\/span>texture<span class=\"token punctuation\">,<\/span> SDL_ScaleModeLinear<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>3.5 \u521d\u59cb\u5316\u56fe\u50cf\u8f6c\u6362\u4e0a\u4e0b\u6587<\/h3>\n<p>SwsContext <span class=\"token operator\">*<\/span>sws_ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">sws_getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">800<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">600<\/span><span class=\"token punctuation\">,<\/span> AV_PIX_FMT_YUV420P<span class=\"token punctuation\">,<\/span>          <span class=\"token comment\">\/\/ \u6e90\u683c\u5f0f<\/span><br \/>\n                                     <span class=\"token number\">640<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">,<\/span> AV_PIX_FMT_RGB24<span class=\"token punctuation\">,<\/span>            <span class=\"token comment\">\/\/ \u76ee\u6807\u683c\u5f0f<\/span><br \/>\n                                     SWS_BILINEAR<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ SWS_BILINEAR \u53cc\u7ebf\u6027\u63d2\u503c\u7b97\u6cd5<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>sws_ctx<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;sws_getContext failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.6 \u8bfb\u53d6\u6587\u4ef6\u6570\u636e<\/h3>\n<p><span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8bfb\u53d6\u6587\u4ef6\u6570\u636e<\/span><br \/>\n    ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    size_in <span class=\"token operator\">&#061;<\/span> ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">gcount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8bfb\u53d6\u5931\u8d25\u6216\u8bfb\u53d6\u5b8c\u6bd5<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;&#061;<\/span> size_in<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;ifs.read end!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ other code &#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.7 \u89e3\u6790\u97f3\u89c6\u9891\u88f8\u6d41\u6570\u636e<\/h3>\n<p>data_in <span class=\"token operator\">&#061;<\/span> buf<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&lt;<\/span> size_in<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u89e3\u6790\u97f3\u89c6\u9891\u88f8\u6d41\u6570\u636e&#xff0c;\u4ece\u4e2d\u5206\u79bb\u51fa\u4e00\u5e27\u4e00\u5e27\u7684\u538b\u7f29\u7f16\u7801\u6570\u636e<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> re <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_parser_parse2<\/span><span class=\"token punctuation\">(<\/span>parser_ctx<span class=\"token punctuation\">,<\/span> decodec_ctx<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>pkt<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>pkt<span class=\"token operator\">-&gt;<\/span>size<span class=\"token punctuation\">,<\/span><br \/>\n                         data_in<span class=\"token punctuation\">,<\/span> size_in<span class=\"token punctuation\">,<\/span> AV_NOPTS_VALUE<span class=\"token punctuation\">,<\/span> AV_NOPTS_VALUE<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    data_in <span class=\"token operator\">&#043;&#061;<\/span> re<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5904\u7406\u4e86\u591a\u5c11&#xff0c;\u6307\u9488\u79fb\u4f4d\u591a\u5c11<\/span><br \/>\n    size_in <span class=\"token operator\">-&#061;<\/span> re<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5904\u7406\u4e86\u591a\u5c11&#xff0c;\u51cf\u53bb\u591a\u5c11&#xff0c;\u5c0f\u4e8e\u7b49\u4e8e0&#xff0c;\u5219\u8bf4\u660e\u8bfb\u53d6\u7684\u5b57\u8282\u5df2\u7ecf\u5904\u7406\u5b8c\u6bd5<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>pkt<span class=\"token operator\">-&gt;<\/span>size<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ other code &#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.8 \u89e3\u7801<\/h3>\n<p><span class=\"token comment\">\/\/ \u53d1\u9001\u89e3\u7801<\/span><br \/>\nret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_send_packet<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">!&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_send_packet failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&lt;&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u63a5\u6536\u89e3\u7801<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_receive_frame<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> frame<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">AVERROR<\/span><span class=\"token punctuation\">(<\/span>EAGAIN<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> ret <span class=\"token operator\">||<\/span> AVERROR_EOF <span class=\"token operator\">&#061;&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_receive_frame failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ other code &#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.9 \u50cf\u7d20\u683c\u5f0f\u8f6c\u6362<\/h3>\n<p><span class=\"token keyword\">int<\/span> height <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">sws_scale<\/span><span class=\"token punctuation\">(<\/span>sws_ctx<span class=\"token punctuation\">,<\/span>                          <span class=\"token comment\">\/\/ \u7531 sws_getContext \u521b\u5efa\u7684 SwsContext \u6307\u9488<\/span><br \/>\n                       frame<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span>                      <span class=\"token comment\">\/\/ \u6e90\u56fe\u50cf\u6570\u636e\u6307\u9488\u6570\u7ec4<\/span><br \/>\n                       frame<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">,<\/span>                  <span class=\"token comment\">\/\/ \u6e90\u56fe\u50cf\u6bcf\u884c\u7684\u5b57\u8282\u6570<\/span><br \/>\n                       <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>                                <span class=\"token comment\">\/\/ \u5904\u7406\u8d77\u59cb\u884c&#xff0c;\u901a\u5e38\u4e3a 0&#xff0c;\u8868\u793a\u4ece\u7b2c\u4e00\u884c\u5f00\u59cb<\/span><br \/>\n                       frame<span class=\"token operator\">-&gt;<\/span>height<span class=\"token punctuation\">,<\/span>                    <span class=\"token comment\">\/\/ \u8981\u5904\u7406\u7684\u884c\u6570&#xff0c;\u901a\u5e38\u4e3a\u6e90\u56fe\u50cf\u7684\u9ad8\u5ea6<\/span><br \/>\n                       frame_rgb24<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span>                <span class=\"token comment\">\/\/ \u76ee\u6807\u56fe\u50cf\u6570\u636e\u6307\u9488\u6570\u7ec4<\/span><br \/>\n                       frame_rgb24<span class=\"token operator\">-&gt;<\/span>linesize             <span class=\"token comment\">\/\/ \u76ee\u6807\u56fe\u50cf\u6bcf\u884c\u7684\u5b57\u8282\u6570<\/span><br \/>\n             <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;<\/span> height<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;sws_scale failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>frame_rgb24<span class=\"token operator\">-&gt;<\/span>pts <span class=\"token operator\">&#061;<\/span> pts<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>3.10 SDL\u6e32\u67d3<\/h3>\n<p><span class=\"token function\">SDL_UpdateTexture<\/span><span class=\"token punctuation\">(<\/span>texture<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">SDL_RenderClear<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">SDL_RenderCopy<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">,<\/span> texture<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">SDL_RenderPresent<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>3.11 \u51b2\u5237\u89e3\u7801\u5668<\/h3>\n<p>ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_send_packet<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">!&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_send_packet failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&lt;&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_receive_frame<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> frame<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">AVERROR<\/span><span class=\"token punctuation\">(<\/span>EAGAIN<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> ret <span class=\"token operator\">||<\/span> AVERROR_EOF <span class=\"token operator\">&#061;&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_receive_packet failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u50cf\u7d20\u683c\u5f0f\u8f6c\u6362<\/span><br \/>\n    <span class=\"token function\">sws_scale<\/span><span class=\"token punctuation\">(<\/span>sws_ctx<span class=\"token punctuation\">,<\/span> frame<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span> frame<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> frame<span class=\"token operator\">-&gt;<\/span>height<span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    frame_rgb24<span class=\"token operator\">-&gt;<\/span>pts <span class=\"token operator\">&#061;<\/span> pts<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> pts <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;- &#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6e32\u67d3rgb24\u7c7b\u578b<\/span><br \/>\n    <span class=\"token function\">SDL_UpdateTexture<\/span><span class=\"token punctuation\">(<\/span>texture<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">SDL_RenderClear<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">SDL_RenderCopy<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">,<\/span> texture<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">SDL_RenderPresent<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.12 \u5185\u5b58\u56de\u6536<\/h3>\n<p>FAILED<span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5185\u5b58\u56de\u6536<\/span><br \/>\n    ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">av_frame_free<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>frame<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">av_packet_free<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">avcodec_free_context<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>decodec_ctx<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">av_parser_close<\/span><span class=\"token punctuation\">(<\/span>parser_ctx<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">av_frame_free<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>frame_rgb24<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">sws_free_context<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>sws_ctx<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>texture<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">SDL_DestroyTexture<\/span><span class=\"token punctuation\">(<\/span>texture<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">SDL_DestroyRenderer<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sdl_win<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">SDL_DestroyWindow<\/span><span class=\"token punctuation\">(<\/span>sdl_win<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">SDL_Quit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h2>4. \u4ee3\u7801\u5408\u96c6<\/h2>\n<p>\u8bfb\u53d6\u672c\u5730h.264\u89c6\u9891\u6587\u4ef6&#xff0c;\u89e3\u7801\u540e&#xff0c;\u7531800&#215;600,YUV420P\u8f6c\u6362\u4e3a640&#215;480,RGB24&#xff0c;\u518d\u901a\u8fc7SDL2\u6e32\u67d3&#xff1b;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fstream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;thread&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;chrono&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">extern<\/span> <span class=\"token string\">&#034;C&#034;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;libavcodec\/avcodec.h&#034;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;libavutil\/avutil.h&#034;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;libswscale\/swscale.h&#034;<\/span><\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;SDL.h&#034;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6253\u5370\u9519\u8bef\u4fe1\u606f<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">av_strerror<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> buf <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">undef<\/span> <span class=\"token expression\">main<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">av_version_info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6253\u5f00\u89c6\u9891\u6587\u4ef6<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>ifstream ifs<span class=\"token punctuation\">;<\/span><br \/>\n    ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;800_600_25.h264&#034;<\/span><span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>ios<span class=\"token double-colon punctuation\">::<\/span>binary<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">is_open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;ifs open file failed!\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Error code: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Error message: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><br \/>\n    <span class=\"token comment\">\/\/\/ \u521d\u59cb\u5316\u89e3\u7801\u5668<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u67e5\u627e\u89e3\u7801\u5668<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> AVCodec <span class=\"token operator\">*<\/span>decodec <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_find_decoder<\/span><span class=\"token punctuation\">(<\/span>AV_CODEC_ID_H264<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>decodec<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_find_decoder failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u89e3\u7801\u5668\u4e0a\u4e0b\u6587<\/span><br \/>\n    AVCodecContext <span class=\"token operator\">*<\/span>decodec_ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_alloc_context3<\/span><span class=\"token punctuation\">(<\/span>decodec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>decodec_ctx<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_alloc_context3 failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6253\u5f00\u89e3\u7801\u5668\u4e0a\u4e0b\u6587<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_open2<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> decodec<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">!&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_open2 failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><br \/>\n    <span class=\"token comment\">\/\/\/ \u521d\u59cb\u5316\u97f3\u89c6\u9891\u7801\u6d41\u89e3\u6790\u5668<\/span><\/p>\n<p>    AVCodecParserContext <span class=\"token operator\">*<\/span>parser_ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_parser_init<\/span><span class=\"token punctuation\">(<\/span>AV_CODEC_ID_H264<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>parser_ctx<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;av_parser_init failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316SDL\u90e8\u5206<\/span><br \/>\n    <span class=\"token function\">SDL_Init<\/span><span class=\"token punctuation\">(<\/span>SDL_INIT_VIDEO<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u521b\u5efa\u7a97\u53e3<\/span><br \/>\n    SDL_Window <span class=\"token operator\">*<\/span>sdl_win <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">SDL_CreateWindow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;xxxxxxxx&#034;<\/span><span class=\"token punctuation\">,<\/span> SDL_WINDOWPOS_UNDEFINED<span class=\"token punctuation\">,<\/span> SDL_WINDOWPOS_UNDEFINED<span class=\"token punctuation\">,<\/span><br \/>\n                                           <span class=\"token number\">640<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">,<\/span> SDL_WINDOW_OPENGL<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u521b\u5efa\u6e32\u67d3\u5668<\/span><br \/>\n    SDL_Renderer <span class=\"token operator\">*<\/span>render <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">SDL_CreateRenderer<\/span><span class=\"token punctuation\">(<\/span>sdl_win<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> SDL_RENDERER_TARGETTEXTURE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u521b\u5efa \u7eb9\u7406|\u6750\u8d28<\/span><br \/>\n    SDL_Texture <span class=\"token operator\">*<\/span>texture <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">SDL_CreateTexture<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">,<\/span> SDL_PIXELFORMAT_RGB24<span class=\"token punctuation\">,<\/span> SDL_TEXTUREACCESS_STREAMING<span class=\"token punctuation\">,<\/span><br \/>\n                                             <span class=\"token number\">640<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u7ebf\u6027\u63d2\u503c&#xff08;\u6297\u952f\u9f7f&#xff09;<\/span><br \/>\n    <span class=\"token function\">SDL_SetTextureScaleMode<\/span><span class=\"token punctuation\">(<\/span>texture<span class=\"token punctuation\">,<\/span> SDL_ScaleModeLinear<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><br \/>\n    <span class=\"token comment\">\/\/\/ \u521d\u59cb\u5316\u56fe\u50cf\u8f6c\u6362\u4e0a\u4e0b\u6587<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ yuv420\u8f6crgb24<\/span><br \/>\n    SwsContext <span class=\"token operator\">*<\/span>sws_ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">sws_getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">800<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">600<\/span><span class=\"token punctuation\">,<\/span> AV_PIX_FMT_YUV420P<span class=\"token punctuation\">,<\/span>          <span class=\"token comment\">\/\/ \u6e90\u683c\u5f0f<\/span><br \/>\n                                         <span class=\"token number\">640<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">,<\/span> AV_PIX_FMT_RGB24<span class=\"token punctuation\">,<\/span>            <span class=\"token comment\">\/\/ \u76ee\u6807\u683c\u5f0f<\/span><br \/>\n                                         SWS_BILINEAR<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ SWS_BILINEAR \u53cc\u7ebf\u6027\u63d2\u503c\u7b97\u6cd5<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>sws_ctx<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;sws_getContext failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> pts <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>data_in <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> size_in <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    AVPacket <span class=\"token operator\">*<\/span>pkt <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_packet_alloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    AVFrame <span class=\"token operator\">*<\/span>frame <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_frame_alloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5b9a\u4e49\u5e76\u4e14\u5206\u914d\u5185\u5b58&#xff0c;\u7528\u4e8e\u63a5\u6536\u8f6c\u6362\u540e\u7684\u4e00\u5e27\u56fe\u50cf<\/span><br \/>\n    AVFrame <span class=\"token operator\">*<\/span>frame_rgb24 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_frame_alloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    frame_rgb24<span class=\"token operator\">-&gt;<\/span>width <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">640<\/span><span class=\"token punctuation\">;<\/span>                       <span class=\"token comment\">\/\/ encodec_ctx-&gt;width<\/span><br \/>\n    frame_rgb24<span class=\"token operator\">-&gt;<\/span>height <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">;<\/span>                      <span class=\"token comment\">\/\/ encodec_ctx-&gt;height<\/span><br \/>\n    frame_rgb24<span class=\"token operator\">-&gt;<\/span>format <span class=\"token operator\">&#061;<\/span> AV_PIX_FMT_RGB24<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ encodec_ctx-&gt;pix_fmt<\/span><br \/>\n    <span class=\"token function\">av_frame_get_buffer<\/span><span class=\"token punctuation\">(<\/span>frame_rgb24<span class=\"token punctuation\">,<\/span> <span class=\"token number\">32<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8bfb\u53d6\u6587\u4ef6\u6570\u636e<\/span><br \/>\n        ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        size_in <span class=\"token operator\">&#061;<\/span> ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">gcount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8bfb\u53d6\u5931\u8d25\u6216\u8bfb\u53d6\u5b8c\u6bd5<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;&#061;<\/span> size_in<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;ifs.read end!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        data_in <span class=\"token operator\">&#061;<\/span> buf<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&lt;<\/span> size_in<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u89e3\u6790\u97f3\u89c6\u9891\u88f8\u6d41\u6570\u636e&#xff0c;\u4ece\u4e2d\u5206\u79bb\u51fa\u4e00\u5e27\u4e00\u5e27\u7684\u538b\u7f29\u7f16\u7801\u6570\u636e<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> re <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_parser_parse2<\/span><span class=\"token punctuation\">(<\/span>parser_ctx<span class=\"token punctuation\">,<\/span> decodec_ctx<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>pkt<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>pkt<span class=\"token operator\">-&gt;<\/span>size<span class=\"token punctuation\">,<\/span><br \/>\n                                 data_in<span class=\"token punctuation\">,<\/span> size_in<span class=\"token punctuation\">,<\/span> AV_NOPTS_VALUE<span class=\"token punctuation\">,<\/span> AV_NOPTS_VALUE<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            data_in <span class=\"token operator\">&#043;&#061;<\/span> re<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5904\u7406\u4e86\u591a\u5c11&#xff0c;\u6307\u9488\u79fb\u4f4d\u591a\u5c11<\/span><br \/>\n            size_in <span class=\"token operator\">-&#061;<\/span> re<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5904\u7406\u4e86\u591a\u5c11&#xff0c;\u51cf\u53bb\u591a\u5c11&#xff0c;\u5c0f\u4e8e\u7b49\u4e8e0&#xff0c;\u5219\u8bf4\u660e\u8bfb\u53d6\u7684\u5b57\u8282\u5df2\u7ecf\u5904\u7406\u5b8c\u6bd5<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>pkt<span class=\"token operator\">-&gt;<\/span>size<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u53d1\u9001\u89e3\u7801<\/span><br \/>\n                ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_send_packet<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">!&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_send_packet failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><\/p>\n<p>                <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&lt;&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token comment\">\/\/ \u63a5\u6536\u89e3\u7801<\/span><br \/>\n                    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_receive_frame<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> frame<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">AVERROR<\/span><span class=\"token punctuation\">(<\/span>EAGAIN<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> ret <span class=\"token operator\">||<\/span> AVERROR_EOF <span class=\"token operator\">&#061;&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_receive_frame failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token comment\">\/\/ \u50cf\u7d20\u683c\u5f0f\u8f6c\u6362<\/span><br \/>\n                    <span class=\"token keyword\">int<\/span> height <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">sws_scale<\/span><span class=\"token punctuation\">(<\/span>sws_ctx<span class=\"token punctuation\">,<\/span>                          <span class=\"token comment\">\/\/ \u7531 sws_getContext \u521b\u5efa\u7684 SwsContext \u6307\u9488<\/span><br \/>\n                                           frame<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span>                      <span class=\"token comment\">\/\/ \u6e90\u56fe\u50cf\u6570\u636e\u6307\u9488\u6570\u7ec4<\/span><br \/>\n                                           frame<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">,<\/span>                  <span class=\"token comment\">\/\/ \u6e90\u56fe\u50cf\u6bcf\u884c\u7684\u5b57\u8282\u6570<\/span><br \/>\n                                           <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>                                <span class=\"token comment\">\/\/ \u5904\u7406\u8d77\u59cb\u884c&#xff0c;\u901a\u5e38\u4e3a 0&#xff0c;\u8868\u793a\u4ece\u7b2c\u4e00\u884c\u5f00\u59cb<\/span><br \/>\n                                           frame<span class=\"token operator\">-&gt;<\/span>height<span class=\"token punctuation\">,<\/span>                    <span class=\"token comment\">\/\/ \u8981\u5904\u7406\u7684\u884c\u6570&#xff0c;\u901a\u5e38\u4e3a\u6e90\u56fe\u50cf\u7684\u9ad8\u5ea6<\/span><br \/>\n                                           frame_rgb24<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span>                <span class=\"token comment\">\/\/ \u76ee\u6807\u56fe\u50cf\u6570\u636e\u6307\u9488\u6570\u7ec4<\/span><br \/>\n                                           frame_rgb24<span class=\"token operator\">-&gt;<\/span>linesize             <span class=\"token comment\">\/\/ \u76ee\u6807\u56fe\u50cf\u6bcf\u884c\u7684\u5b57\u8282\u6570<\/span><br \/>\n                                 <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;<\/span> height<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;sws_scale failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><\/p>\n<p>                    frame_rgb24<span class=\"token operator\">-&gt;<\/span>pts <span class=\"token operator\">&#061;<\/span> pts<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> pts <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token comment\">\/\/ \u6e32\u67d3rgb24\u7c7b\u578b<\/span><br \/>\n                    <span class=\"token function\">SDL_UpdateTexture<\/span><span class=\"token punctuation\">(<\/span>texture<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token function\">SDL_RenderClear<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token function\">SDL_RenderCopy<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">,<\/span> texture<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token function\">SDL_RenderPresent<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token comment\">\/\/ \u7761\u7720 40 \u6beb\u79d2<\/span><br \/>\n                    <span class=\"token comment\">\/\/std::this_thread::sleep_for(std::chrono::milliseconds(40));<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u51b2\u5237\u89e3\u7801\u5668<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_send_packet<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">!&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_send_packet failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&lt;&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_receive_frame<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> frame<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">AVERROR<\/span><span class=\"token punctuation\">(<\/span>EAGAIN<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> ret <span class=\"token operator\">||<\/span> AVERROR_EOF <span class=\"token operator\">&#061;&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_receive_packet failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u50cf\u7d20\u683c\u5f0f\u8f6c\u6362<\/span><br \/>\n        <span class=\"token function\">sws_scale<\/span><span class=\"token punctuation\">(<\/span>sws_ctx<span class=\"token punctuation\">,<\/span> frame<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span> frame<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> frame<span class=\"token operator\">-&gt;<\/span>height<span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        frame_rgb24<span class=\"token operator\">-&gt;<\/span>pts <span class=\"token operator\">&#061;<\/span> pts<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> pts <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;- &#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6e32\u67d3rgb24\u7c7b\u578b<\/span><br \/>\n        <span class=\"token function\">SDL_UpdateTexture<\/span><span class=\"token punctuation\">(<\/span>texture<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> frame_rgb24<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">SDL_RenderClear<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">SDL_RenderCopy<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">,<\/span> texture<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">SDL_RenderPresent<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>FAILED<span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5185\u5b58\u56de\u6536<\/span><br \/>\n    ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">av_frame_free<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>frame<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">av_packet_free<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">avcodec_free_context<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>decodec_ctx<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">av_parser_close<\/span><span class=\"token punctuation\">(<\/span>parser_ctx<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">av_frame_free<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>frame_rgb24<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">sws_free_context<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>sws_ctx<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>texture<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">SDL_DestroyTexture<\/span><span class=\"token punctuation\">(<\/span>texture<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">SDL_DestroyRenderer<\/span><span class=\"token punctuation\">(<\/span>render<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sdl_win<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">SDL_DestroyWindow<\/span><span class=\"token punctuation\">(<\/span>sdl_win<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">SDL_Quit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>5. \u89c6\u9891\u6548\u679c\u622a\u56fe<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260807091803-6a75a2cb6d302.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>6. \u8fdb\u9636<\/h2>\n<p>\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<br \/>\n\/\/\/ \u9700\u6c42&#xff1a;<br \/>\n\/\/\/     1.\u8bfb\u53d6800_600_25.h264\u89c6\u9891\u6587\u4ef6&#xff1b;<br \/>\n\/\/\/     2.\u89e3\u7801&#xff1b;<br \/>\n\/\/\/     3.\u5c06\u5bbd\u9ad8\u4fee\u6539\u4e3a640&#215;480&#xff0c;\u50cf\u7d20\u683c\u5f0f\u4ece YUV420P \u8f6c\u6362\u4e3a YUV444P&#xff1b;<br \/>\n\/\/\/     4.\u7f16\u7801&#xff1b;<br \/>\n\/\/\/     5.\u5199\u5165640_480.h264\u6587\u4ef6&#xff1b;<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/p>\n<p>\u6839\u636e FFmpeg H264\u89c6\u9891\u7f16\u7801\u5168\u6d41\u7a0b\u89e3\u6790 &#043; FFmpeg H264\u89c6\u9891\u89e3\u7801\u5168\u6d41\u7a0b\u89e3\u6790 \u518d\u52a0\u4e0a\u672c\u7bc7\u5b66\u4e60\u7684\u5185\u5bb9&#xff0c;\u53ef\u4ee5\u5b8c\u6210&#xff01;<\/p>\n<h3>6.1 \u5b9e\u73b0\u6e90\u7801<\/h3>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fstream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;thread&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;chrono&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">extern<\/span> <span class=\"token string\">&#034;C&#034;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;libavcodec\/avcodec.h&#034;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;libavutil\/avutil.h&#034;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;libswscale\/swscale.h&#034;<\/span><\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6253\u5370\u9519\u8bef\u4fe1\u606f<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">av_strerror<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> buf <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/\/ \u9700\u6c42&#xff1a;<\/span><br \/>\n<span class=\"token comment\">\/\/\/     1.\u8bfb\u53d6800_600_25.h264\u89c6\u9891\u6587\u4ef6&#xff1b;<\/span><br \/>\n<span class=\"token comment\">\/\/\/     2.\u89e3\u7801&#xff1b;<\/span><br \/>\n<span class=\"token comment\">\/\/\/     3.\u5c06\u5bbd\u9ad8\u4fee\u6539\u4e3a640&#215;480&#xff0c;\u50cf\u7d20\u683c\u5f0f\u4ece YUV420P \u8f6c\u6362\u4e3a YUV444P&#xff1b;<\/span><br \/>\n<span class=\"token comment\">\/\/\/     4.\u7f16\u7801&#xff1b;<\/span><br \/>\n<span class=\"token comment\">\/\/\/     5.\u5199\u5165640_480.h264\u6587\u4ef6&#xff1b;<\/span><br \/>\n<span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">av_version_info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6253\u5f00\u89c6\u9891\u6587\u4ef6<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>ifstream ifs<span class=\"token punctuation\">;<\/span><br \/>\n    ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;800_600_25.h264&#034;<\/span><span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>ios<span class=\"token double-colon punctuation\">::<\/span>binary<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">is_open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;ifs open file failed!\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Error code: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Error message: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><br \/>\n    <span class=\"token comment\">\/\/\/ \u521d\u59cb\u5316\u89e3\u7801\u5668<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u67e5\u627e\u89e3\u7801\u5668<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> AVCodec <span class=\"token operator\">*<\/span>decodec <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_find_decoder<\/span><span class=\"token punctuation\">(<\/span>AV_CODEC_ID_H264<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>decodec<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_find_decoder failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u89e3\u7801\u5668\u4e0a\u4e0b\u6587<\/span><br \/>\n    AVCodecContext <span class=\"token operator\">*<\/span>decodec_ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_alloc_context3<\/span><span class=\"token punctuation\">(<\/span>decodec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>decodec_ctx<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_alloc_context3 failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6253\u5f00\u89e3\u7801\u5668\u4e0a\u4e0b\u6587<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_open2<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> decodec<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">!&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_open2 failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><br \/>\n    <span class=\"token comment\">\/\/\/ \u521d\u59cb\u5316\u97f3\u89c6\u9891\u7801\u6d41\u89e3\u6790\u5668<\/span><\/p>\n<p>    AVCodecParserContext <span class=\"token operator\">*<\/span>parser_ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_parser_init<\/span><span class=\"token punctuation\">(<\/span>AV_CODEC_ID_H264<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>parser_ctx<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;av_parser_init failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6253\u5f00\u8f93\u51fa\u6587\u4ef6<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>ofstream ofd<span class=\"token punctuation\">;<\/span><br \/>\n    ofd<span class=\"token punctuation\">.<\/span><span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;640_480.h264&#034;<\/span><span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>ios<span class=\"token double-colon punctuation\">::<\/span>binary<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u4e00\u5b9a\u8981\u4ee5\u4e8c\u8fdb\u5236\u65b9\u5f0f\u6253\u5f00<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ofd<span class=\"token punctuation\">.<\/span><span class=\"token function\">is_open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;ofd open failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Error code: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> errno <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Error message: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><br \/>\n    <span class=\"token comment\">\/\/\/ \u521d\u59cb\u5316\u7f16\u7801\u5668<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u67e5\u627e\u7f16\u7801\u5668<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> AVCodec <span class=\"token operator\">*<\/span>encodec <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_find_encoder<\/span><span class=\"token punctuation\">(<\/span>AV_CODEC_ID_H264<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>encodec<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_find_encoder failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u7f16\u7801\u5668\u4e0a\u4e0b\u6587<\/span><br \/>\n    AVCodecContext <span class=\"token operator\">*<\/span>encodec_ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_alloc_context3<\/span><span class=\"token punctuation\">(<\/span>encodec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>encodec_ctx<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_alloc_context3 failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u57fa\u7840\u4fe1\u606f<\/span><br \/>\n    encodec_ctx<span class=\"token operator\">-&gt;<\/span>width <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">640<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    encodec_ctx<span class=\"token operator\">-&gt;<\/span>height <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    encodec_ctx<span class=\"token operator\">-&gt;<\/span>time_base <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">25<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    encodec_ctx<span class=\"token operator\">-&gt;<\/span>pix_fmt <span class=\"token operator\">&#061;<\/span> AV_PIX_FMT_YUV444P<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6253\u5f00\u7f16\u7801\u5668\u4e0a\u4e0b\u6587<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> re <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_open2<\/span><span class=\"token punctuation\">(<\/span>encodec_ctx<span class=\"token punctuation\">,<\/span> encodec<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">!&#061;<\/span> re<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_open2 failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>re<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><br \/>\n    <span class=\"token comment\">\/\/\/ \u521d\u59cb\u5316\u56fe\u50cf\u8f6c\u6362\u4e0a\u4e0b\u6587<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ yuv420\u8f6cyuv444<\/span><br \/>\n    SwsContext <span class=\"token operator\">*<\/span>sws_ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">sws_getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">800<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">600<\/span><span class=\"token punctuation\">,<\/span> AV_PIX_FMT_YUV420P<span class=\"token punctuation\">,<\/span>          <span class=\"token comment\">\/\/ \u6e90\u683c\u5f0f<\/span><br \/>\n                                         <span class=\"token number\">640<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">,<\/span> AV_PIX_FMT_YUV444P<span class=\"token punctuation\">,<\/span>          <span class=\"token comment\">\/\/ \u76ee\u6807\u683c\u5f0f<\/span><br \/>\n                                         SWS_BILINEAR<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ SWS_BILINEAR \u53cc\u7ebf\u6027\u63d2\u503c\u7b97\u6cd5<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> pts <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>data_in <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> size_in <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    AVPacket <span class=\"token operator\">*<\/span>pkt <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_packet_alloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    AVFrame <span class=\"token operator\">*<\/span>frame <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_frame_alloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5b9a\u4e49\u5e76\u4e14\u5206\u914d\u5185\u5b58&#xff0c;\u7528\u4e8e\u63a5\u6536\u8f6c\u6362\u540e\u7684\u4e00\u5e27\u56fe\u50cf<\/span><br \/>\n    AVFrame <span class=\"token operator\">*<\/span>frame_yuv444 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_frame_alloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    frame_yuv444<span class=\"token operator\">-&gt;<\/span>width <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">640<\/span><span class=\"token punctuation\">;<\/span>                       <span class=\"token comment\">\/\/ encodec_ctx-&gt;width<\/span><br \/>\n    frame_yuv444<span class=\"token operator\">-&gt;<\/span>height <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">480<\/span><span class=\"token punctuation\">;<\/span>                      <span class=\"token comment\">\/\/ encodec_ctx-&gt;height<\/span><br \/>\n    frame_yuv444<span class=\"token operator\">-&gt;<\/span>format <span class=\"token operator\">&#061;<\/span> AV_PIX_FMT_YUV444P<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ encodec_ctx-&gt;pix_fmt<\/span><br \/>\n    <span class=\"token function\">av_frame_get_buffer<\/span><span class=\"token punctuation\">(<\/span>frame_yuv444<span class=\"token punctuation\">,<\/span> <span class=\"token number\">32<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8bfb\u53d6\u6587\u4ef6\u6570\u636e<\/span><br \/>\n        ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        size_in <span class=\"token operator\">&#061;<\/span> ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">gcount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8bfb\u53d6\u5931\u8d25\u6216\u8bfb\u53d6\u5b8c\u6bd5<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;&#061;<\/span> size_in<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;ifs.read end!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        data_in <span class=\"token operator\">&#061;<\/span> buf<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&lt;<\/span> size_in<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u89e3\u6790\u97f3\u89c6\u9891\u88f8\u6d41\u6570\u636e&#xff0c;\u4ece\u4e2d\u5206\u79bb\u51fa\u4e00\u5e27\u4e00\u5e27\u7684\u538b\u7f29\u7f16\u7801\u6570\u636e<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> re <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">av_parser_parse2<\/span><span class=\"token punctuation\">(<\/span>parser_ctx<span class=\"token punctuation\">,<\/span> decodec_ctx<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>pkt<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>pkt<span class=\"token operator\">-&gt;<\/span>size<span class=\"token punctuation\">,<\/span><br \/>\n                                 data_in<span class=\"token punctuation\">,<\/span> size_in<span class=\"token punctuation\">,<\/span> AV_NOPTS_VALUE<span class=\"token punctuation\">,<\/span> AV_NOPTS_VALUE<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            data_in <span class=\"token operator\">&#043;&#061;<\/span> re<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5904\u7406\u4e86\u591a\u5c11&#xff0c;\u6307\u9488\u79fb\u4f4d\u591a\u5c11<\/span><br \/>\n            size_in <span class=\"token operator\">-&#061;<\/span> re<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5904\u7406\u4e86\u591a\u5c11&#xff0c;\u51cf\u53bb\u591a\u5c11&#xff0c;\u5c0f\u4e8e\u7b49\u4e8e0&#xff0c;\u5219\u8bf4\u660e\u8bfb\u53d6\u7684\u5b57\u8282\u5df2\u7ecf\u5904\u7406\u5b8c\u6bd5<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>pkt<span class=\"token operator\">-&gt;<\/span>size<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u53d1\u9001\u89e3\u7801<\/span><br \/>\n                ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_send_packet<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">!&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_send_packet failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><\/p>\n<p>                <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&lt;&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token comment\">\/\/ \u63a5\u6536\u89e3\u7801<\/span><br \/>\n                    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_receive_frame<\/span><span class=\"token punctuation\">(<\/span>decodec_ctx<span class=\"token punctuation\">,<\/span> frame<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">AVERROR<\/span><span class=\"token punctuation\">(<\/span>EAGAIN<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> ret <span class=\"token operator\">||<\/span> AVERROR_EOF <span class=\"token operator\">&#061;&#061;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;<\/span> ret<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_receive_frame failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token comment\">\/\/ \u50cf\u7d20\u683c\u5f0f\u8f6c\u6362<\/span><br \/>\n                    <span class=\"token keyword\">int<\/span> height <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">sws_scale<\/span><span class=\"token punctuation\">(<\/span>sws_ctx<span class=\"token punctuation\">,<\/span>                          <span class=\"token comment\">\/\/ \u7531 sws_getContext \u521b\u5efa\u7684 SwsContext \u6307\u9488<\/span><br \/>\n                                           frame<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span>                      <span class=\"token comment\">\/\/ \u6e90\u56fe\u50cf\u6570\u636e\u6307\u9488\u6570\u7ec4<\/span><br \/>\n                                           frame<span class=\"token operator\">-&gt;<\/span>linesize<span class=\"token punctuation\">,<\/span>                  <span class=\"token comment\">\/\/ \u6e90\u56fe\u50cf\u6bcf\u884c\u7684\u5b57\u8282\u6570<\/span><br \/>\n                                           <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>                                <span class=\"token comment\">\/\/ \u5904\u7406\u8d77\u59cb\u884c&#xff0c;\u901a\u5e38\u4e3a 0&#xff0c;\u8868\u793a\u4ece\u7b2c\u4e00\u884c\u5f00\u59cb<\/span><br \/>\n                                           frame<span class=\"token operator\">-&gt;<\/span>height<span class=\"token punctuation\">,<\/span>                    <span class=\"token comment\">\/\/ \u8981\u5904\u7406\u7684\u884c\u6570&#xff0c;\u901a\u5e38\u4e3a\u6e90\u56fe\u50cf\u7684\u9ad8\u5ea6<\/span><br \/>\n                                           frame_yuv444<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span>                <span class=\"token comment\">\/\/ \u76ee\u6807\u56fe\u50cf\u6570\u636e\u6307\u9488\u6570\u7ec4<\/span><br \/>\n                                           frame_yuv444<span class=\"token operator\">-&gt;<\/span>linesize             <span class=\"token comment\">\/\/ \u76ee\u6807\u56fe\u50cf\u6bcf\u884c\u7684\u5b57\u8282\u6570<\/span><br \/>\n                                 <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&gt;<\/span> height<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;sws_scale failed! ret &#061; &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ret <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">goto<\/span> FAILED<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><\/p>\n<p>                    frame_yuv444<span class=\"token operator\">-&gt;<\/span>pts <span class=\"token operator\">&#061;<\/span> pts<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token comment\">\/\/ \u53d1\u9001\u7f16\u7801<\/span><br \/>\n                    <span class=\"token keyword\">int<\/span> re <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_send_frame<\/span><span class=\"token punctuation\">(<\/span>encodec_ctx<span class=\"token punctuation\">,<\/span> frame_yuv444<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>re <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_send_frame failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>re<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><\/p>\n<p>                    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>re <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token comment\">\/\/ \u63a5\u6536\u7f16\u7801\u540e\u7684\u6570\u636e\u5305<\/span><br \/>\n                        <span class=\"token keyword\">int<\/span> re <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_receive_packet<\/span><span class=\"token punctuation\">(<\/span>encodec_ctx<span class=\"token punctuation\">,<\/span> pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>re <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token function\">AVERROR<\/span><span class=\"token punctuation\">(<\/span>EAGAIN<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> re <span class=\"token operator\">&#061;&#061;<\/span> AVERROR_EOF<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                            <span class=\"token comment\">\/\/ \u76ee\u524d\u8fd8\u6ca1\u6709\u6570\u636e\u6216\u5df2\u7ecf\u5230\u7ed3\u5c3e<\/span><br \/>\n                            <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>re <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;avcodec_receive_packet failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                            <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>re<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                            <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token punctuation\">}<\/span><\/p>\n<p>                        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> pts <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        ofd<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>pkt<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span> pkt<span class=\"token operator\">-&gt;<\/span>size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                        <span class=\"token comment\">\/\/ \u91ca\u653e<\/span><br \/>\n                        <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><\/p>\n<p>                    <span class=\"token comment\">\/\/ \u7761\u7720 40 \u6beb\u79d2<\/span><br \/>\n<span class=\"token comment\">\/\/                    std::this_thread::sleep_for(std::chrono::milliseconds(40));<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u51b2\u5237\u7f16\u7801\u5668<\/span><br \/>\n    re <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_send_frame<\/span><span class=\"token punctuation\">(<\/span>encodec_ctx<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>re <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span>  <span class=\"token string\">&#034;avcodec_send_frame failed!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">PrintErr<\/span><span class=\"token punctuation\">(<\/span>re<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>re <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            re <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">avcodec_receive_packet<\/span><span class=\"token punctuation\">(<\/span>encodec_ctx<span class=\"token punctuation\">,<\/span> pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>re <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token function\">AVERROR<\/span><span class=\"token punctuation\">(<\/span>EAGAIN<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>re <span class=\"token operator\">&#061;&#061;<\/span> AVERROR_EOF<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>re <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> pts <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;- &#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            ofd<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>pkt<span class=\"token operator\">-&gt;<\/span>data<span class=\"token punctuation\">,<\/span> pkt<span class=\"token operator\">-&gt;<\/span>size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">av_packet_unref<\/span><span class=\"token punctuation\">(<\/span>pkt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>FAILED<span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5185\u5b58\u56de\u6536<\/span><br \/>\n    ifs<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span 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