{"id":23310,"date":"2025-04-19T07:32:00","date_gmt":"2025-04-18T23:32:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/23310.html"},"modified":"2025-04-19T07:32:00","modified_gmt":"2025-04-18T23:32:00","slug":"c%e4%b8%8elive555%e5%ae%9e%e7%8e%b0rtsp%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/23310.html","title":{"rendered":"C++\u4e0eLive555\u5b9e\u73b0RTSP\u670d\u52a1\u5668"},"content":{"rendered":"

<\/h3>\n

\u4e00\u3001\u5f15\u8a00（Introduction）<\/h3>\n

1.1 RTSP\u670d\u52a1\u5668\u7684\u91cd\u8981\u6027（Importance of RTSP Server）<\/h3>\n

RTSP（Real Time Streaming Protocol，\u5b9e\u65f6\u6d41\u4f20\u8f93\u534f\u8bae）\u670d\u52a1\u5668\u5728\u73b0\u4ee3\u7f51\u7edc\u4f20\u8f93\u4e2d\u626e\u6f14\u7740\u81f3\u5173\u91cd\u8981\u7684\u89d2\u8272\u3002RTSP\u670d\u52a1\u5668\u4e3b\u8981\u7528\u4e8e\u63a7\u5236\u97f3\u9891\u6216\u89c6\u9891\u7684\u591a\u5a92\u4f53\u4f1a\u8bdd，\u5b83\u4e3a\u4e92\u8054\u7f51\u4e0a\u7684\u97f3\u9891\u89c6\u9891\u670d\u52a1\u63d0\u4f9b\u4e86\u4e00\u79cd\u63a7\u5236\u6846\u67b6，\u4f7f\u5f97\u7528\u6237\u53ef\u4ee5\u65b9\u4fbf\u5730\u64ad\u653e\u3001\u6682\u505c\u3001\u5feb\u8fdb\u3001\u5012\u9000\u7b49\u64cd\u4f5c，\u6781\u5927\u5730\u63d0\u9ad8\u4e86\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n

RTSP\u670d\u52a1\u5668\u7684\u91cd\u8981\u6027\u4e3b\u8981\u4f53\u73b0\u5728\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762：<\/p>\n

  • \u5b9e\u65f6\u6027（Real-time）：RTSP\u670d\u52a1\u5668\u652f\u6301\u5b9e\u65f6\u4f20\u8f93，\u8fd9\u5bf9\u4e8e\u76f4\u64ad\u3001\u89c6\u9891\u4f1a\u8bae\u7b49\u5e94\u7528\u573a\u666f\u81f3\u5173\u91cd\u8981\u3002\u7528\u6237\u53ef\u4ee5\u5b9e\u65f6\u63a5\u6536\u5e76\u64ad\u653e\u97f3\u89c6\u9891\u6570\u636e，\u65e0\u9700\u7b49\u5f85\u6574\u4e2a\u6587\u4ef6\u4e0b\u8f7d\u5b8c\u6210\u3002<\/li>\n
  • \u63a7\u5236\u6027（Controllability）：RTSP\u670d\u52a1\u5668\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u63a7\u5236\u547d\u4ee4，\u5982PLAY\u3001PAUSE\u3001TEARDOWN\u7b49，\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e9b\u547d\u4ee4\u5bf9\u97f3\u89c6\u9891\u64ad\u653e\u8fdb\u884c\u7cbe\u786e\u63a7\u5236\u3002<\/li>\n
  • \u6269\u5c55\u6027（Scalability）：RTSP\u670d\u52a1\u5668\u53ef\u4ee5\u652f\u6301\u5927\u91cf\u7684\u5e76\u53d1\u8fde\u63a5，\u9002\u5e94\u5927\u89c4\u6a21\u7528\u6237\u7684\u9700\u6c42\u3002\u540c\u65f6，RTSP\u670d\u52a1\u5668\u8fd8\u652f\u6301\u591a\u79cd\u4f20\u8f93\u534f\u8bae，\u5982TCP\u3001UDP\u7b49，\u5177\u6709\u5f88\u597d\u7684\u6269\u5c55\u6027\u3002<\/li>\n
  • \u4e92\u52a8\u6027（Interactivity）：RTSP\u670d\u52a1\u5668\u652f\u6301\u53cc\u5411\u6570\u636e\u4f20\u8f93，\u53ef\u4ee5\u5b9e\u73b0\u7528\u6237\u4e0e\u670d\u52a1\u5668\u4e4b\u95f4\u7684\u4ea4\u4e92，\u5982\u804a\u5929\u3001\u6295\u7968\u7b49\u3002<\/li>\n
  • \u5b89\u5168\u6027（Security）：RTSP\u670d\u52a1\u5668\u652f\u6301\u591a\u79cd\u5b89\u5168\u673a\u5236，\u5982\u57fa\u4e8e\u8bc1\u4e66\u7684\u8eab\u4efd\u9a8c\u8bc1\u3001\u6570\u636e\u52a0\u5bc6\u7b49，\u53ef\u4ee5\u4fdd\u62a4\u7528\u6237\u7684\u9690\u79c1\u548c\u6570\u636e\u5b89\u5168\u3002<\/li>\n

    \u56e0\u6b64，\u6df1\u5165\u7406\u89e3\u548c\u638c\u63e1RTSP\u670d\u52a1\u5668\u7684\u6784\u5efa\u548c\u4f18\u5316，\u5bf9\u4e8e\u63d0\u5347\u6211\u4eec\u7684\u7f51\u7edc\u5e94\u7528\u670d\u52a1\u8d28\u91cf，\u6ee1\u8db3\u7528\u6237\u5bf9\u4e8e\u97f3\u89c6\u9891\u670d\u52a1\u7684\u9ad8\u9700\u6c42\u5177\u6709\u91cd\u8981\u7684\u610f\u4e49\u3002\u5728\u63a5\u4e0b\u6765\u7684\u7ae0\u8282\u4e2d，\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528C++\u548cLive555\u5e93\u6765\u6784\u5efa\u9ad8\u6548\u3001\u7a33\u5b9a\u7684RTSP\u670d\u52a1\u5668\u3002<\/p>\n

    1.2 C++\u4e0eLive555\u5e93\u7684\u4f18\u52bf（Advantages of C++ and Live555）<\/h3>\n

    \u5728\u6784\u5efaRTSP\u670d\u52a1\u5668\u7684\u8fc7\u7a0b\u4e2d，\u9009\u62e9\u5408\u9002\u7684\u7f16\u7a0b\u8bed\u8a00\u548c\u5e93\u662f\u975e\u5e38\u5173\u952e\u7684\u3002C++\u548cLive555\u5e93\u5728\u8fd9\u65b9\u9762\u5177\u6709\u663e\u8457\u7684\u4f18\u52bf\u3002<\/p>\n

    C++\u7684\u4f18\u52bf：<\/p>\n

  • \u6027\u80fd\u4f18\u8d8a（Superior Performance）：C++\u662f\u4e00\u79cd\u9759\u6001\u7c7b\u578b\u7684\u7f16\u8bd1\u8bed\u8a00，\u5b83\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u8bed\u8a00\u7279\u6027\u548c\u5f3a\u5927\u7684\u6027\u80fd，\u53ef\u4ee5\u6ee1\u8db3\u9ad8\u6027\u80fd\u670d\u52a1\u5668\u7684\u9700\u6c42\u3002<\/li>\n
  • \u5185\u5b58\u7ba1\u7406（Memory Management）：C++\u63d0\u4f9b\u4e86\u76f4\u63a5\u7684\u5185\u5b58\u7ba1\u7406\u80fd\u529b，\u5f00\u53d1\u8005\u53ef\u4ee5\u7cbe\u786e\u5730\u63a7\u5236\u5185\u5b58\u7684\u5206\u914d\u548c\u91ca\u653e，\u8fd9\u5bf9\u4e8e\u5904\u7406\u5927\u91cf\u7684\u5e76\u53d1\u8fde\u63a5\u548c\u6570\u636e\u6d41\u975e\u5e38\u91cd\u8981\u3002<\/li>\n
  • \u9762\u5411\u5bf9\u8c61（Object-Oriented）：C++\u662f\u4e00\u79cd\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u8bed\u8a00，\u5b83\u7684\u5c01\u88c5\u3001\u7ee7\u627f\u548c\u591a\u6001\u7b49\u7279\u6027\u4f7f\u5f97\u4ee3\u7801\u66f4\u52a0\u6a21\u5757\u5316，\u6613\u4e8e\u7ef4\u62a4\u548c\u6269\u5c55\u3002<\/li>\n

    Live555\u5e93\u7684\u4f18\u52bf：<\/p>\n

  • \u4e13\u4e1a\u6027（Professionalism）：Live555\u662f\u4e00\u4e2a\u4e13\u95e8\u7528\u4e8e\u5b9e\u73b0RTSP\u670d\u52a1\u5668\u7684\u5f00\u6e90\u5e93，\u5b83\u63d0\u4f9b\u4e86\u4e00\u5957\u5b8c\u6574\u7684API，\u53ef\u4ee5\u65b9\u4fbf\u5730\u5b9e\u73b0RTSP\u7684\u5404\u79cd\u529f\u80fd\u3002<\/li>\n
  • \u7a33\u5b9a\u6027（Stability）：Live555\u5e93\u7ecf\u8fc7\u4e86\u957f\u65f6\u95f4\u7684\u6d4b\u8bd5\u548c\u4f7f\u7528，\u7a33\u5b9a\u6027\u975e\u5e38\u9ad8，\u53ef\u4ee5\u6ee1\u8db3\u751f\u4ea7\u73af\u5883\u7684\u9700\u6c42\u3002<\/li>\n
  • \u8de8\u5e73\u53f0（Cross-platform）：Live555\u5e93\u652f\u6301\u591a\u79cd\u64cd\u4f5c\u7cfb\u7edf，\u5305\u62ecWindows\u3001Linux\u3001Mac OS\u7b49，\u5f00\u53d1\u8005\u53ef\u4ee5\u5728\u4e0d\u540c\u7684\u5e73\u53f0\u4e0a\u8fdb\u884c\u5f00\u53d1\u548c\u90e8\u7f72\u3002<\/li>\n
  • \u793e\u533a\u652f\u6301（Community Support）：Live555\u6709\u4e00\u4e2a\u6d3b\u8dc3\u7684\u5f00\u6e90\u793e\u533a，\u5f00\u53d1\u8005\u53ef\u4ee5\u4ece\u793e\u533a\u83b7\u53d6\u5e2e\u52a9，\u5206\u4eab\u7ecf\u9a8c，\u540c\u65f6\u4e5f\u53ef\u4ee5\u4e3a\u793e\u533a\u8d21\u732e\u4ee3\u7801\u3002<\/li>\n

    \u7efc\u4e0a，C++\u548cLive555\u5e93\u662f\u6784\u5efaRTSP\u670d\u52a1\u5668\u7684\u7406\u60f3\u9009\u62e9\u3002\u5728\u63a5\u4e0b\u6765\u7684\u7ae0\u8282\u4e2d，\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528C++\u548cLive555\u5e93\u6765\u6784\u5efaRTSP\u670d\u52a1\u5668\u3002<\/p>\n

    1.3 \u53ef\u80fd\u7528\u5230\u7684\u7c7b\u548c\u63a5\u53e3\u4ecb\u7ecd<\/h3>\n

    \u5728Live555\u5e93\u4e2d，\u4ee5\u4e0b\u662f\u4e00\u4e9b\u53ef\u80fd\u4f1a\u7528\u5230\u7684\u7c7b\u548c\u65b9\u6cd5：<\/p>\n

  • UsageEnvironment\u7c7b：\u8fd9\u662f\u4e00\u4e2a\u62bd\u8c61\u57fa\u7c7b，\u7528\u4e8e\u5b9a\u4e49\u4e8b\u4ef6\u5faa\u73af\u3002\u4f60\u53ef\u80fd\u4f1a\u4f7f\u7528\u5230\u5b83\u7684taskScheduler()\u65b9\u6cd5\u6765\u83b7\u53d6\u4efb\u52a1\u8c03\u5ea6\u5668\u3002<\/li>\n
  • BasicUsageEnvironment\u7c7b：\u8fd9\u662fUsageEnvironment\u7684\u4e00\u4e2a\u5177\u4f53\u5b9e\u73b0，\u4f60\u53ef\u80fd\u4f1a\u4f7f\u7528\u5b83\u7684createNew()\u65b9\u6cd5\u6765\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u73af\u5883\u3002<\/li>\n
  • RTSPServer\u7c7b：\u8fd9\u4e2a\u7c7b\u7528\u4e8e\u521b\u5efa\u548c\u7ba1\u7406RTSP\u670d\u52a1\u5668\u3002\u4f60\u53ef\u80fd\u4f1a\u4f7f\u7528\u5230\u5b83\u7684createNew()\u65b9\u6cd5\u6765\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u670d\u52a1\u5668，\u4ee5\u53caaddServerMediaSession()\u65b9\u6cd5\u6765\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684\u5a92\u4f53\u4f1a\u8bdd\u3002<\/li>\n
  • ServerMediaSession\u7c7b：\u8fd9\u4e2a\u7c7b\u8868\u793a\u4e00\u4e2aRTSP\u670d\u52a1\u5668\u7684\u5a92\u4f53\u4f1a\u8bdd\u3002\u4f60\u53ef\u80fd\u4f1a\u4f7f\u7528\u5230\u5b83\u7684addSubsession()\u65b9\u6cd5\u6765\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684\u5b50\u4f1a\u8bdd\u3002<\/li>\n
  • H264VideoStreamFramer\u7c7b：\u8fd9\u4e2a\u7c7b\u7528\u4e8e\u521b\u5efaH.264\u89c6\u9891\u6d41\u3002\u4f60\u53ef\u80fd\u4f1a\u4f7f\u7528\u5230\u5b83\u7684createNew()\u65b9\u6cd5\u6765\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u89c6\u9891\u6d41\u3002<\/li>\n

    \u4ee5\u4e0a\u53ea\u662f\u4e00\u4e9b\u57fa\u672c\u7684\u7c7b\u548c\u65b9\u6cd5，\u5b9e\u9645\u4f7f\u7528\u65f6\u53ef\u80fd\u8fd8\u9700\u8981\u5176\u4ed6\u7684\u7c7b\u548c\u65b9\u6cd5\u3002\u5177\u4f53\u7684\u4f7f\u7528\u65b9\u6cd5\u548c\u53c2\u6570\u5e94\u6839\u636eLive555\u7684\u5b98\u65b9\u6587\u6863\u548c\u6e90\u4ee3\u7801\u6765\u786e\u5b9a\u3002<\/p>\n

    \u5728\u4f7f\u7528Live555\u5e93\u65f6，\u53ef\u80fd\u4f1a\u7528\u5230\u4ee5\u4e0b\u4e00\u4e9b\u51fd\u6570\u548c\u63a5\u53e3：<\/p>\n

  • RTSPClient::createNew: \u521b\u5efa\u4e00\u4e2a\u65b0\u7684RTSP\u5ba2\u6237\u7aef\u5b9e\u4f8b\u3002\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u4e00\u4e2a\u73af\u5883\u53d8\u91cf，RTSP URL，\u4ee5\u53ca\u4e00\u4e2a\u53ef\u9009\u7684\u5e94\u7528\u7a0b\u5e8f\u540d\u79f0\u548c\u7aef\u53e3\u53f7\u3002<\/li>\n
  • RTSPServer::createNew: \u521b\u5efa\u4e00\u4e2a\u65b0\u7684RTSP\u670d\u52a1\u5668\u5b9e\u4f8b\u3002\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u4e00\u4e2a\u73af\u5883\u53d8\u91cf\u548c\u4e00\u4e2a\u53ef\u9009\u7684\u670d\u52a1\u5668\u7aef\u53e3\u53f7\u3002<\/li>\n
  • RTSPClient::sendPlayCommand: \u53d1\u9001\u4e00\u4e2aPLAY\u547d\u4ee4\u5230RTSP\u670d\u52a1\u5668\u3002\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u4e00\u4e2a\u5a92\u4f53\u4f1a\u8bdd\u548c\u4e00\u4e2a\u53ef\u9009\u7684\u56de\u8c03\u51fd\u6570\u3002<\/li>\n
  • RTSPClient::sendPauseCommand: \u53d1\u9001\u4e00\u4e2aPAUSE\u547d\u4ee4\u5230RTSP\u670d\u52a1\u5668\u3002\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u4e00\u4e2a\u5a92\u4f53\u4f1a\u8bdd\u548c\u4e00\u4e2a\u53ef\u9009\u7684\u56de\u8c03\u51fd\u6570\u3002<\/li>\n
  • RTSPClient::sendTeardownCommand: \u53d1\u9001\u4e00\u4e2aTEARDOWN\u547d\u4ee4\u5230RTSP\u670d\u52a1\u5668\u3002\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u4e00\u4e2a\u5a92\u4f53\u4f1a\u8bdd\u548c\u4e00\u4e2a\u53ef\u9009\u7684\u56de\u8c03\u51fd\u6570\u3002<\/li>\n
  • RTSPServer::setUpTunnelingOverHTTP: \u8bbe\u7f6eRTSP\u670d\u52a1\u5668\u4ee5\u901a\u8fc7HTTP\u8fdb\u884c\u96a7\u9053\u4f20\u8f93\u3002\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u4e00\u4e2aHTTP\u7aef\u53e3\u53f7\u3002<\/li>\n
  • RTSPServer::addUserRecord: \u6dfb\u52a0\u4e00\u4e2a\u7528\u6237\u8bb0\u5f55\u5230RTSP\u670d\u52a1\u5668\u7684\u7528\u6237\u6570\u636e\u5e93\u3002\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u4e00\u4e2a\u7528\u6237\u540d\u548c\u5bc6\u7801\u3002<\/li>\n
  • RTSPServer::removeUserRecord: \u4eceRTSP\u670d\u52a1\u5668\u7684\u7528\u6237\u6570\u636e\u5e93\u4e2d\u5220\u9664\u4e00\u4e2a\u7528\u6237\u8bb0\u5f55\u3002\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u4e00\u4e2a\u7528\u6237\u540d\u3002<\/li>\n

    \u4ee5\u4e0a\u4fe1\u606f\u662f\u6839\u636eGitHub\u4e0a\u7684\u4ee3\u7801\u7247\u6bb5\u63d0\u53d6\u7684，\u53ef\u80fd\u5e76\u4e0d\u5b8c\u5168\u51c6\u786e，\u5177\u4f53\u4f7f\u7528\u65f6\u8fd8\u9700\u8981\u53c2\u8003Live555\u7684\u5b98\u65b9\u6587\u6863\u548c\u6e90\u4ee3\u7801\u3002<\/p>\n

    \u4e8c\u3001C++\u4e0eLive555\u5e93\u6982\u8ff0（Overview of C++ and Live555）<\/h3>\n

    2.1 C++\u8bed\u8a00\u7279\u6027（Features of C++）<\/h3>\n

    C++\u662f\u4e00\u79cd\u901a\u7528\u7684\u7f16\u7a0b\u8bed\u8a00，\u5b83\u5728C\u8bed\u8a00\u7684\u57fa\u7840\u4e0a\u589e\u52a0\u4e86\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b（Object-Oriented Programming，\u7b80\u79f0OOP）\u7684\u7279\u6027\u3002C++\u7684\u4e3b\u8981\u7279\u6027\u53ef\u4ee5\u5f52\u7eb3\u4e3a\u4ee5\u4e0b\u51e0\u70b9：<\/p>\n

  • \u9762\u5411\u5bf9\u8c61\u7f16\u7a0b（Object-Oriented Programming）：C++\u652f\u6301\u5c01\u88c5（Encapsulation）\u3001\u7ee7\u627f（Inheritance）\u548c\u591a\u6001（Polymorphism）\u7b49\u9762\u5411\u5bf9\u8c61\u7684\u57fa\u672c\u7279\u6027\u3002\u8fd9\u4e9b\u7279\u6027\u4f7f\u5f97C++\u80fd\u591f\u66f4\u597d\u5730\u5904\u7406\u590d\u6742\u7684\u95ee\u9898，\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u91cd\u7528\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/li>\n
  • \u6cdb\u578b\u7f16\u7a0b（Generic Programming）：C++\u7684\u6a21\u677f（Template）\u7279\u6027\u652f\u6301\u6cdb\u578b\u7f16\u7a0b，\u8fd9\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u51fa\u901a\u7528\u7684\u3001\u53ef\u91cd\u7528\u7684\u4ee3\u7801\u3002<\/li>\n
  • \u4f4e\u7ea7\u64cd\u4f5c（Low-Level Manipulation）：C++\u5141\u8bb8\u7a0b\u5e8f\u5458\u8fdb\u884c\u76f4\u63a5\u7684\u5185\u5b58\u64cd\u4f5c，\u8fd9\u4f7f\u5f97C++\u80fd\u591f\u7f16\u5199\u51fa\u9ad8\u6548\u7684\u4ee3\u7801，\u6ee1\u8db3\u5bf9\u6027\u80fd\u8981\u6c42\u8f83\u9ad8\u7684\u573a\u666f\u3002<\/li>\n
  • \u4e30\u5bcc\u7684\u5e93\u652f\u6301（Rich Library Support）：C++\u6709\u7740\u4e30\u5bcc\u7684\u6807\u51c6\u5e93（\u5982STL）\u548c\u7b2c\u4e09\u65b9\u5e93（\u5982Live555），\u8fd9\u4e9b\u5e93\u63d0\u4f9b\u4e86\u5927\u91cf\u7684\u6570\u636e\u7ed3\u6784\u548c\u7b97\u6cd5，\u6781\u5927\u5730\u63d0\u9ad8\u4e86\u5f00\u53d1\u6548\u7387\u3002<\/li>\n
  • \u517c\u5bb9C\u8bed\u8a00（Compatibility with C）：C++\u51e0\u4e4e\u5b8c\u5168\u517c\u5bb9C\u8bed\u8a00，\u8fd9\u4f7f\u5f97C++\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u5927\u91cf\u7684C\u8bed\u8a00\u4ee3\u7801\u548c\u5e93\u3002<\/li>\n

    \u4ee5\u4e0a\u7279\u6027\u4f7f\u5f97C++\u6210\u4e3a\u4e86\u4e00\u79cd\u5f3a\u5927\u800c\u7075\u6d3b\u7684\u7f16\u7a0b\u8bed\u8a00，\u5b83\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5404\u79cd\u9886\u57df，\u5305\u62ec\u64cd\u4f5c\u7cfb\u7edf\u3001\u6e38\u620f\u5f00\u53d1\u3001\u5d4c\u5165\u5f0f\u7cfb\u7edf\u3001\u5b9e\u65f6\u7cfb\u7edf\u3001\u7f51\u7edc\u7f16\u7a0b\u7b49\u3002\u5728RTSP\u670d\u52a1\u5668\u7684\u5f00\u53d1\u4e2d，C++\u7684\u8fd9\u4e9b\u7279\u6027\u4e5f\u80fd\u591f\u5f97\u5230\u5145\u5206\u7684\u5229\u7528\u3002<\/p>\n

    2.2 Live555\u5e93\u7b80\u4ecb（Introduction to Live555）<\/h3>\n

    Live555\u662f\u4e00\u4e2a\u5f00\u6e90\u7684\u6d41\u5a92\u4f53\u5e93，\u5b83\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684API\u63a5\u53e3，\u7528\u4e8e\u5b9e\u73b0RTSP（Real Time Streaming Protocol）\u670d\u52a1\u5668\u548c\u5ba2\u6237\u7aef\u7684\u529f\u80fd\u3002Live555\u5e93\u7684\u4e3b\u8981\u7279\u6027\u53ef\u4ee5\u5f52\u7eb3\u4e3a\u4ee5\u4e0b\u51e0\u70b9：<\/p>\n

  • \u652f\u6301\u591a\u79cd\u6d41\u5a92\u4f53\u534f\u8bae：Live555\u652f\u6301\u591a\u79cd\u6d41\u5a92\u4f53\u534f\u8bae，\u5305\u62ecRTSP\u3001RTP（Real-time Transport Protocol）\u3001RTCP（RTP Control Protocol）\u7b49\u3002\u8fd9\u4f7f\u5f97Live555\u80fd\u591f\u5904\u7406\u5404\u79cd\u590d\u6742\u7684\u6d41\u5a92\u4f53\u4f20\u8f93\u4efb\u52a1\u3002<\/li>\n
  • \u652f\u6301\u591a\u79cd\u5a92\u4f53\u683c\u5f0f：Live555\u652f\u6301\u591a\u79cd\u5a92\u4f53\u683c\u5f0f，\u5305\u62ecH.264\u3001H.265\u3001AAC\u3001MP3\u7b49\u3002\u8fd9\u4f7f\u5f97Live555\u80fd\u591f\u5904\u7406\u5404\u79cd\u7c7b\u578b\u7684\u5a92\u4f53\u6570\u636e\u3002<\/li>\n
  • \u652f\u6301\u591a\u5e73\u53f0：Live555\u53ef\u4ee5\u5728\u591a\u79cd\u64cd\u4f5c\u7cfb\u7edf\u4e0a\u8fd0\u884c，\u5305\u62ecWindows\u3001Linux\u3001Mac OS\u7b49\u3002\u8fd9\u4f7f\u5f97Live555\u5177\u6709\u5f88\u597d\u7684\u8de8\u5e73\u53f0\u6027\u3002<\/li>\n
  • \u9ad8\u6548\u7684\u6027\u80fd：Live555\u5728\u8bbe\u8ba1\u548c\u5b9e\u73b0\u4e0a\u6ce8\u91cd\u6548\u7387，\u5b83\u80fd\u591f\u5904\u7406\u5927\u91cf\u7684\u5e76\u53d1\u8fde\u63a5，\u6ee1\u8db3\u9ad8\u6027\u80fd\u7684\u9700\u6c42\u3002<\/li>\n
  • \u4e30\u5bcc\u7684\u793a\u4f8b\u4ee3\u7801：Live555\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u793a\u4f8b\u4ee3\u7801，\u8fd9\u4e9b\u4ee3\u7801\u8986\u76d6\u4e86\u5404\u79cd\u5e38\u89c1\u7684\u4f7f\u7528\u573a\u666f，\u5bf9\u4e8e\u5f00\u53d1\u8005\u6765\u8bf4\u662f\u5f88\u597d\u7684\u5b66\u4e60\u8d44\u6599\u3002<\/li>\n

    \u5728RTSP\u670d\u52a1\u5668\u7684\u5f00\u53d1\u4e2d，Live555\u5e93\u7684\u8fd9\u4e9b\u7279\u6027\u4f7f\u5f97\u5b83\u6210\u4e3a\u4e86\u4e00\u4e2a\u7406\u60f3\u7684\u9009\u62e9\u3002\u901a\u8fc7\u4f7f\u7528Live555，\u6211\u4eec\u53ef\u4ee5\u66f4\u52a0\u65b9\u4fbf\u548c\u9ad8\u6548\u5730\u5b9e\u73b0RTSP\u670d\u52a1\u5668\u7684\u529f\u80fd\u3002<\/p>\n

    2.3 Live555\u5728RTSP\u670d\u52a1\u5668\u4e2d\u7684\u5e94\u7528（Application of Live555 in RTSP Server）<\/h3>\n

    \u5728RTSP\u670d\u52a1\u5668\u7684\u5f00\u53d1\u4e2d，Live555\u5e93\u53d1\u6325\u7740\u91cd\u8981\u7684\u4f5c\u7528\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4e3b\u8981\u7684\u5e94\u7528\u573a\u666f：<\/p>\n

  • \u5a92\u4f53\u6d41\u7684\u5c01\u88c5\u548c\u4f20\u8f93：Live555\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684\u7c7b\u548c\u51fd\u6570，\u7528\u4e8e\u5c01\u88c5\u548c\u4f20\u8f93\u5a92\u4f53\u6d41\u3002\u4f8b\u5982，\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528H264VideoStreamFramer\u7c7b\u6765\u5c01\u88c5H.264\u89c6\u9891\u6d41，\u7136\u540e\u4f7f\u7528RTPSink\u7c7b\u6765\u5c06\u5c01\u88c5\u540e\u7684\u6d41\u53d1\u9001\u5230\u5ba2\u6237\u7aef\u3002<\/li>\n
  • RTSP\u4f1a\u8bdd\u7684\u7ba1\u7406：Live555\u63d0\u4f9b\u4e86RTSPServer\u7c7b，\u7528\u4e8e\u7ba1\u7406RTSP\u4f1a\u8bdd\u3002RTSPServer\u7c7b\u53ef\u4ee5\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42，\u7ba1\u7406\u5a92\u4f53\u6d41\u7684\u64ad\u653e\u548c\u6682\u505c，\u4ee5\u53ca\u5904\u7406\u5176\u4ed6\u7684RTSP\u547d\u4ee4\u3002<\/li>\n
  • \u5a92\u4f53\u6e90\u7684\u7ba1\u7406：Live555\u63d0\u4f9b\u4e86MediaSession\u7c7b，\u7528\u4e8e\u7ba1\u7406\u5a92\u4f53\u6e90\u3002MediaSession\u7c7b\u53ef\u4ee5\u7ba1\u7406\u4e00\u4e2a\u6216\u591a\u4e2a\u5a92\u4f53\u6d41，\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u7edf\u4e00\u7684\u63a5\u53e3，\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u63a7\u5236\u5a92\u4f53\u6d41\u7684\u64ad\u653e\u548c\u6682\u505c\u3002<\/li>\n
  • \u9519\u8bef\u5904\u7406\u548c\u65e5\u5fd7\u8bb0\u5f55：Live555\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684\u9519\u8bef\u5904\u7406\u548c\u65e5\u5fd7\u8bb0\u5f55\u529f\u80fd，\u8fd9\u4e9b\u529f\u80fd\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u597d\u5730\u8c03\u8bd5\u548c\u7ef4\u62a4RTSP\u670d\u52a1\u5668\u3002<\/li>\n

    \u901a\u8fc7\u4ee5\u4e0a\u7684\u5e94\u7528，\u6211\u4eec\u53ef\u4ee5\u770b\u5230，Live555\u5e93\u4e3aRTSP\u670d\u52a1\u5668\u7684\u5f00\u53d1\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u652f\u6301\u3002\u5728\u540e\u7eed\u7684\u7ae0\u8282\u4e2d，\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528Live555\u5e93\u6765\u6784\u5efaRTSP\u670d\u52a1\u5668\u3002<\/p>\n

    \u4e09\u3001RTSP\u670d\u52a1\u5668\u7684\u6784\u5efa\u6d41\u7a0b（Building Process of RTSP Server）<\/h3>\n

    3.1 RTSP\u670d\u52a1\u5668\u7684\u57fa\u672c\u67b6\u6784（Basic Architecture of RTSP Server）<\/h3>\n

    RTSP（Real Time Streaming Protocol，\u5b9e\u65f6\u6d41\u4f20\u8f93\u534f\u8bae）\u670d\u52a1\u5668\u662f\u4e00\u79cd\u4e13\u95e8\u7528\u4e8e\u63a7\u5236\u97f3\u9891\u6216\u89c6\u9891\u6d41\u7684\u4f20\u8f93\u7684\u670d\u52a1\u5668\u3002\u5b83\u7684\u4e3b\u8981\u529f\u80fd\u662f\u63a7\u5236\u6570\u636e\u6d41\u7684\u64ad\u653e\u3001\u6682\u505c\u3001\u56de\u653e\u7b49\u64cd\u4f5c，\u800c\u6570\u636e\u6d41\u7684\u4f20\u8f93\u5219\u901a\u5e38\u7531RTP（Real-time Transport Protocol，\u5b9e\u65f6\u4f20\u8f93\u534f\u8bae）\u6216\u8005UDP（User Datagram Protocol，\u7528\u6237\u6570\u636e\u62a5\u534f\u8bae）\u6765\u5b8c\u6210\u3002<\/p>\n

    RTSP\u670d\u52a1\u5668\u7684\u57fa\u672c\u67b6\u6784\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u90e8\u5206：<\/p>\n

  • \u5ba2\u6237\u7aef（Client）：\u5ba2\u6237\u7aef\u662f\u53d1\u8d77RTSP\u8bf7\u6c42\u7684\u4e00\u65b9，\u901a\u5e38\u662f\u7528\u6237\u7684\u64ad\u653e\u8bbe\u5907，\u5982\u7535\u8111\u3001\u624b\u673a\u7b49\u3002<\/li>\n
  • \u670d\u52a1\u5668（Server）：\u670d\u52a1\u5668\u662f\u63a5\u6536\u548c\u5904\u7406RTSP\u8bf7\u6c42\u7684\u4e00\u65b9，\u8d1f\u8d23\u5bf9\u8bf7\u6c42\u8fdb\u884c\u54cd\u5e94，\u5e76\u63a7\u5236\u6570\u636e\u6d41\u7684\u4f20\u8f93\u3002<\/li>\n
  • \u5a92\u4f53\u6d41（Media Stream）：\u5a92\u4f53\u6d41\u662f\u670d\u52a1\u5668\u4f20\u8f93\u7684\u97f3\u9891\u6216\u89c6\u9891\u6570\u636e，\u901a\u5e38\u7531RTP\u6216UDP\u534f\u8bae\u8fdb\u884c\u4f20\u8f93\u3002<\/li>\n
  • \u63a7\u5236\u534f\u8bae（Control Protocol）：\u63a7\u5236\u534f\u8bae\u662f\u7528\u4e8e\u63a7\u5236\u5a92\u4f53\u6d41\u4f20\u8f93\u7684\u534f\u8bae，\u901a\u5e38\u662fRTSP\u534f\u8bae\u3002<\/li>\n

    \u5728\u8fd9\u4e2a\u67b6\u6784\u4e2d，\u5ba2\u6237\u7aef\u901a\u8fc7\u53d1\u9001RTSP\u8bf7\u6c42（\u5982PLAY\u3001PAUSE\u7b49）\u7ed9\u670d\u52a1\u5668，\u670d\u52a1\u5668\u63a5\u6536\u5230\u8bf7\u6c42\u540e，\u901a\u8fc7\u63a7\u5236\u534f\u8bae\u6765\u63a7\u5236\u5a92\u4f53\u6d41\u7684\u4f20\u8f93\u3002\u4f8b\u5982，\u5f53\u5ba2\u6237\u7aef\u53d1\u9001\u4e00\u4e2aPLAY\u8bf7\u6c42\u65f6，\u670d\u52a1\u5668\u4f1a\u5f00\u59cb\u4f20\u8f93\u5a92\u4f53\u6d41；\u5f53\u5ba2\u6237\u7aef\u53d1\u9001\u4e00\u4e2aPAUSE\u8bf7\u6c42\u65f6，\u670d\u52a1\u5668\u4f1a\u6682\u505c\u4f20\u8f93\u5a92\u4f53\u6d41\u3002<\/p>\n

    \u8fd9\u79cd\u67b6\u6784\u7684\u4f18\u70b9\u662f，\u5b83\u5c06\u6570\u636e\u6d41\u7684\u4f20\u8f93\u548c\u63a7\u5236\u5206\u79bb\u5f00\u6765，\u4f7f\u5f97\u670d\u52a1\u5668\u53ef\u4ee5\u66f4\u7075\u6d3b\u5730\u63a7\u5236\u6570\u636e\u6d41\u7684\u4f20\u8f93，\u800c\u5ba2\u6237\u7aef\u4e5f\u53ef\u4ee5\u66f4\u65b9\u4fbf\u5730\u63a7\u5236\u6570\u636e\u6d41\u7684\u64ad\u653e\u3002\u540c\u65f6，\u7531\u4e8eRTSP\u534f\u8bae\u662f\u57fa\u4e8eTCP（Transmission Control Protocol，\u4f20\u8f93\u63a7\u5236\u534f\u8bae）\u7684，\u56e0\u6b64\u5b83\u53ef\u4ee5\u63d0\u4f9b\u53ef\u9760\u7684\u6570\u636e\u4f20\u8f93，\u786e\u4fdd\u6570\u636e\u6d41\u7684\u5b8c\u6574\u6027\u548c\u51c6\u786e\u6027\u3002<\/p>\n

    \u5728\u4e0b\u4e00\u8282\u4e2d，\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528C++\u548cLive555\u5e93\u6765\u6784\u5efa\u4e00\u4e2aRTSP\u670d\u52a1\u5668，\u5305\u62ec\u5982\u4f55\u8bbe\u7f6e\u670d\u52a1\u5668\u3001\u5982\u4f55\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42，\u4ee5\u53ca\u5982\u4f55\u63a7\u5236\u5a92\u4f53\u6d41\u7684\u4f20\u8f93\u7b49\u3002<\/p>\n

    3.2 \u4f7f\u7528C++\u548cLive555\u6784\u5efaRTSP\u670d\u52a1\u5668（Building RTSP Server with C++ and Live555）<\/h3>\n

    Live555\u662f\u4e00\u4e2a\u5f00\u6e90\u7684\u6d41\u5a92\u4f53\u5e93，\u63d0\u4f9b\u4e86\u4e00\u5957\u5b8c\u6574\u7684API，\u53ef\u4ee5\u65b9\u4fbf\u5730\u6784\u5efaRTSP\u670d\u52a1\u5668\u3002\u5728\u8fd9\u4e00\u8282\u4e2d，\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528C++\u548cLive555\u5e93\u6765\u6784\u5efa\u4e00\u4e2aRTSP\u670d\u52a1\u5668\u3002<\/p>\n

    \u6b65\u9aa4\u4e00：\u73af\u5883\u914d\u7f6e（Environment Configuration）<\/h4>\n

    \u9996\u5148，\u6211\u4eec\u9700\u8981\u5728\u6211\u4eec\u7684\u5f00\u53d1\u73af\u5883\u4e2d\u5b89\u88c5Live555\u5e93\u3002Live555\u5e93\u652f\u6301\u591a\u79cd\u64cd\u4f5c\u7cfb\u7edf，\u5305\u62ecWindows\u3001Linux\u548cMac OS\u7b49\u3002\u6211\u4eec\u53ef\u4ee5\u4eceLive555\u7684\u5b98\u65b9\u7f51\u7ad9\u4e0b\u8f7d\u6e90\u4ee3\u7801，\u7136\u540e\u6309\u7167\u5b98\u65b9\u7684\u5b89\u88c5\u6307\u5357\u8fdb\u884c\u5b89\u88c5\u3002<\/p>\n

    \u6b65\u9aa4\u4e8c：\u521b\u5efaRTSP\u670d\u52a1\u5668（Creating RTSP Server）<\/h4>\n

    \u521b\u5efaRTSP\u670d\u52a1\u5668\u7684\u7b2c\u4e00\u6b65\u662f\u521b\u5efa\u4e00\u4e2aRTSP\u670d\u52a1\u5668\u5b9e\u4f8b\u3002\u5728Live555\u5e93\u4e2d，\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528RTSPServer::createNew\u51fd\u6570\u6765\u521b\u5efa\u4e00\u4e2aRTSP\u670d\u52a1\u5668\u5b9e\u4f8b\u3002\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u4e00\u4e2aUsageEnvironment\u53c2\u6570，\u8fd9\u662fLive555\u5e93\u4e2d\u7684\u4e00\u4e2a\u6838\u5fc3\u7c7b，\u7528\u4e8e\u5904\u7406\u4e8b\u4ef6\u5faa\u73af\u548c\u9519\u8bef\u62a5\u544a\u3002<\/p>\n

    TaskScheduler* scheduler = BasicTaskScheduler::createNew();
    \nUsageEnvironment* env = BasicUsageEnvironment::createNew(*scheduler);
    \nRTSPServer* rtspServer = RTSPServer::createNew(*env, 8554); <\/p>\n

    \u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d，\u6211\u4eec\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2aTaskScheduler\u5b9e\u4f8b\u548c\u4e00\u4e2aUsageEnvironment\u5b9e\u4f8b，\u7136\u540e\u4f7f\u7528\u8fd9\u4e24\u4e2a\u5b9e\u4f8b\u4f5c\u4e3a\u53c2\u6570\u521b\u5efa\u4e86\u4e00\u4e2aRTSP\u670d\u52a1\u5668\u5b9e\u4f8b\u3002\u8fd9\u4e2aRTSP\u670d\u52a1\u5668\u76d1\u542c8554\u7aef\u53e3\u3002<\/p>\n

    \u6b65\u9aa4\u4e09：\u521b\u5efa\u5a92\u4f53\u4f1a\u8bdd（Creating Media Session）<\/h4>\n

    \u521b\u5efaRTSP\u670d\u52a1\u5668\u540e，\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u6216\u591a\u4e2a\u5a92\u4f53\u4f1a\u8bdd（Media Session）\u3002\u6bcf\u4e2a\u5a92\u4f53\u4f1a\u8bdd\u5bf9\u5e94\u4e00\u4e2a\u5a92\u4f53\u6d41，\u53ef\u4ee5\u662f\u97f3\u9891\u6d41\u3001\u89c6\u9891\u6d41\u6216\u8005\u5176\u4ed6\u7c7b\u578b\u7684\u5a92\u4f53\u6d41\u3002<\/p>\n

    \u5728Live555\u5e93\u4e2d，\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528ServerMediaSession::createNew\u51fd\u6570\u6765\u521b\u5efa\u4e00\u4e2a\u5a92\u4f53\u4f1a\u8bdd\u3002\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u4e00\u4e2aUsageEnvironment\u53c2\u6570，\u4e00\u4e2a\u4f1a\u8bdd\u540d\u79f0，\u4ee5\u53ca\u4e00\u4e9b\u5176\u4ed6\u7684\u53c2\u6570，\u5982\u5a92\u4f53\u6e90\u3001\u5a92\u4f53\u7c7b\u578b\u7b49\u3002<\/p>\n

    ServerMediaSession* sms = ServerMediaSession::createNew(*env, "testStream", "testStream",
    \n "Session streamed by \\\\"testStream\\\\"", True \/*SSM*\/);
    \nrtspServer->addServerMediaSession(sms); <\/p>\n

    \u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d，\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3a"testStream"\u7684\u5a92\u4f53\u4f1a\u8bdd，\u5e76\u5c06\u8fd9\u4e2a\u4f1a\u8bdd\u6dfb\u52a0\u5230\u4e86RTSP\u670d\u52a1\u5668\u4e2d\u3002<\/p>\n

    \u6b65\u9aa4\u56db：\u542f\u52a8\u4e8b\u4ef6\u5faa\u73af（Starting Event Loop）<\/h4>\n

    \u6700\u540e，\u6211\u4eec\u9700\u8981\u542f\u52a8\u4e8b\u4ef6\u5faa\u73af，\u8ba9RTSP\u670d\u52a1\u5668\u5f00\u59cb\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u3002<\/p>\n

    env->taskScheduler().doEventLoop(); \/\/ does not return <\/p>\n

    \u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d，\u6211\u4eec\u8c03\u7528\u4e86doEventLoop\u51fd\u6570，\u8fd9\u4e2a\u51fd\u6570\u4f1a\u963b\u585e\u5f53\u524d\u7ebf\u7a0b，\u76f4\u5230\u4e8b\u4ef6\u5faa\u73af\u88ab\u505c\u6b62\u3002<\/p>\n

    Here is an example of a C++ program that uses the Live555 library to create an RTSP server: <\/p>\n

    #include "liveMedia.hh"
    \n#include "BasicUsageEnvironment.hh"<\/p>\n

    int main(int argc, char** argv) {
    \n \/\/ Begin by setting up our usage environment:
    \n TaskScheduler* scheduler = BasicTaskScheduler::createNew();
    \n UsageEnvironment* env = BasicUsageEnvironment::createNew(*scheduler);<\/p>\n

    UserAuthenticationDatabase* authDB = NULL;
    \n#ifdef ACCESS_CONTROL
    \n \/\/ To implement client access control to the RTSP server, do the following:
    \n authDB = new UserAuthenticationDatabase;
    \n authDB->addUserRecord("username1", "password1"); \/\/ replace these with real strings
    \n \/\/ Repeat the above with each <username>, <password> that you wish to allow
    \n \/\/ access to the server.
    \n#endif<\/p>\n

    \/\/ Create the RTSP server. Try first with the default port number (554),
    \n \/\/ and then with the alternative port number (8554):
    \n RTSPServer* rtspServer;
    \n portNumBits rtspServerPortNum = 554;
    \n rtspServer = RTSPServer::createNew(*env, rtspServerPortNum, authDB);
    \n if (rtspServer == NULL) {
    \n rtspServerPortNum = 8554;
    \n rtspServer = RTSPServer::createNew(*env, rtspServerPortNum, authDB);
    \n }
    \n if (rtspServer == NULL) {
    \n *env << "Failed to create RTSP server: " << env->getResultMsg() << "\\\\n";
    \n exit(1);
    \n }<\/p>\n

    char* descriptionString
    \n = (char*)"Session streamed by \\\\"testOnDemandRTSPServer\\\\"";<\/p>\n

    \/\/ A H.264 video elementary stream:
    \n {
    \n char const* streamName = "h264ESVideoTest";
    \n char const* inputFileName = "test.264";
    \n ServerMediaSession* sms
    \n = ServerMediaSession::createNew(*env, streamName, streamName,
    \n descriptionString);
    \n sms->addSubsession(H264VideoFileServerMediaSubsession
    \n ::createNew(*env, inputFileName, False));
    \n rtspServer->addServerMediaSession(sms);<\/p>\n

    announceStream(rtspServer, sms, streamName, inputFileName);
    \n }<\/p>\n

    env->taskScheduler().doEventLoop(); \/\/ does not return<\/p>\n

    return 0; \/\/ only to prevent compiler warning
    \n} <\/p>\n

    This program creates an RTSP server that streams a H.264 video file named \u201ctest.264\u201d. The server listens on port 554 or 8554 if 554 is not available. The video stream is named \u201ch264ESVideoTest\u201d. The server runs an event loop that does not return, waiting for and responding to RTSP requests.
    \n Please note that you need to replace "test.264" with the actual path to your H.264 video file. Also, this is a simplified example and does not include error handling and other necessary production-level code.
    \n You can find the full code and more examples in the Live555 GitHub repository. <\/p>\n

    3.3 \u4ee3\u7801\u793a\u4f8b\u4e0e\u89e3\u6790（Code Examples and Analysis）<\/h3>\n

    \u5728\u8fd9\u4e00\u90e8\u5206，\u6211\u4eec\u5c06\u901a\u8fc7\u4e00\u4e2a\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u6765\u5c55\u793a\u5982\u4f55\u4f7f\u7528C++\u548cLive555\u5e93\u6784\u5efaRTSP\u670d\u52a1\u5668\u3002\u6211\u4eec\u5c06\u8be6\u7ec6\u89e3\u6790\u6bcf\u4e00\u884c\u4ee3\u7801\u7684\u4f5c\u7528，\u4ee5\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u638c\u63e1\u8fd9\u4e00\u8fc7\u7a0b\u3002<\/p>\n

    \u9996\u5148，\u6211\u4eec\u9700\u8981\u5305\u542b\u5fc5\u8981\u7684\u5934\u6587\u4ef6\u3002Live555\u5e93\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684\u5934\u6587\u4ef6，\u8fd9\u4e9b\u5934\u6587\u4ef6\u5b9a\u4e49\u4e86\u6211\u4eec\u5728\u6784\u5efaRTSP\u670d\u52a1\u5668\u65f6\u6240\u9700\u8981\u7684\u5404\u79cd\u7c7b\u548c\u51fd\u6570\u3002<\/p>\n

    #include "liveMedia.hh"
    \n#include "BasicUsageEnvironment.hh"
    \n#include "GroupsockHelper.hh" <\/p>\n

    \u63a5\u4e0b\u6765，\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2aUsageEnvironment\u5b9e\u4f8b\u3002UsageEnvironment\u662fLive555\u5e93\u4e2d\u7684\u4e00\u4e2a\u6838\u5fc3\u7c7b，\u5b83\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684\u57fa\u7840\u8bbe\u65bd，\u5982\u65e5\u5fd7\u8bb0\u5f55\u3001\u9519\u8bef\u5904\u7406\u7b49\u3002<\/p>\n

    TaskScheduler* scheduler = BasicTaskScheduler::createNew();
    \nUsageEnvironment* env = BasicUsageEnvironment::createNew(*scheduler); <\/p>\n

    \u7136\u540e，\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2aRTSPServer\u5b9e\u4f8b\u3002RTSPServer\u662fLive555\u5e93\u4e2d\u7684\u4e00\u4e2a\u6838\u5fc3\u7c7b，\u5b83\u5c01\u88c5\u4e86RTSP\u670d\u52a1\u5668\u7684\u4e3b\u8981\u529f\u80fd\u3002<\/p>\n

    RTSPServer* rtspServer = RTSPServer::createNew(*env, 8554);
    \nif (rtspServer == NULL) {
    \n *env << "Failed to create RTSP server: " << env->getResultMsg() << "\\\\n";
    \n exit(1);
    \n} <\/p>\n

    \u5728\u521b\u5efaRTSPServer\u5b9e\u4f8b\u540e，\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2aServerMediaSession\u5b9e\u4f8b，\u5e76\u5c06\u5176\u6dfb\u52a0\u5230RTSPServer\u4e2d\u3002ServerMediaSession\u4ee3\u8868\u4e86\u4e00\u4e2a\u5a92\u4f53\u4f1a\u8bdd，\u5b83\u53ef\u4ee5\u5305\u542b\u4e00\u4e2a\u6216\u591a\u4e2a\u5a92\u4f53\u6d41\u3002<\/p>\n

    ServerMediaSession* sms = ServerMediaSession::createNew(*env, "testStream", "testStream",
    \n "Session streamed by \\\\"testRTSPServer\\\\"",
    \n True \/*SSM*\/);
    \nrtspServer->addServerMediaSession(sms); <\/p>\n

    \u6700\u540e，\u6211\u4eec\u9700\u8981\u542f\u52a8\u4e8b\u4ef6\u5faa\u73af，\u5f00\u59cb\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u3002<\/p>\n

    env->taskScheduler().doEventLoop(); \/\/ does not return <\/p>\n

    \u4ee5\u4e0a\u5c31\u662f\u4e00\u4e2a\u7b80\u5355\u7684RTSP\u670d\u52a1\u5668\u7684\u6784\u5efa\u8fc7\u7a0b\u3002\u901a\u8fc7\u8fd9\u4e2a\u8fc7\u7a0b，\u6211\u4eec\u53ef\u4ee5\u770b\u5230，\u4f7f\u7528C++\u548cLive555\u5e93\u6784\u5efaRTSP\u670d\u52a1\u5668\u662f\u4e00\u4ef6\u76f8\u5bf9\u7b80\u5355\u7684\u4e8b\u60c5\u3002\u53ea\u9700\u8981\u7406\u89e3\u5e76\u638c\u63e1Live555\u5e93\u4e2d\u7684\u51e0\u4e2a\u6838\u5fc3\u7c7b\u548c\u51fd\u6570，\u5c31\u53ef\u4ee5\u8f7b\u677e\u5730\u6784\u5efa\u51fa\u4e00\u4e2a\u529f\u80fd\u5f3a\u5927\u7684RTSP\u670d\u52a1\u5668\u3002<\/p>\n

    \u8fd9\u662f\u4e00\u4e2a\u4f7f\u7528Live555\u5e93\u5b9e\u73b0\u7684RTSP\u670d\u52a1\u5668\u7684C++\u793a\u4f8b\u4ee3\u7801\u3002<\/p>\n

    #include "liveMedia.hh" \/\/ \u5f15\u5165liveMedia\u5e93
    \n#include "BasicUsageEnvironment.hh" \/\/ \u5f15\u5165BasicUsageEnvironment\u5e93
    \n#include "GroupsockHelper.hh" \/\/ \u5f15\u5165GroupsockHelper\u5e93<\/p>\n

    UsageEnvironment* env; \/\/ \u5b9a\u4e49\u73af\u5883\u53d8\u91cf<\/p>\n

    char const* inputFileName = "test.mp4"; \/\/ \u5b9a\u4e49\u8f93\u5165\u6587\u4ef6\u540d
    \nFramedSource* videoSource; \/\/ \u5b9a\u4e49\u89c6\u9891\u6e90
    \nRTPSink* videoSink; \/\/ \u5b9a\u4e49RTP\u63a5\u6536\u5668<\/p>\n

    void play(); \/\/ \u5b9a\u4e49\u64ad\u653e\u51fd\u6570<\/p>\n

    int main(int argc, char** argv) { \/\/ \u4e3b\u51fd\u6570
    \n TaskScheduler* scheduler = BasicTaskScheduler::createNew(); \/\/ \u521b\u5efa\u65b0\u7684\u4efb\u52a1\u8c03\u5ea6\u5668
    \n env = BasicUsageEnvironment::createNew(*scheduler); \/\/ \u521b\u5efa\u65b0\u7684\u73af\u5883<\/p>\n

    \/\/ \u521b\u5efa\u8f93\u5165\u6587\u4ef6\u6e90
    \n videoSource = ByteStreamFileSource::createNew(*env, inputFileName);
    \n if (videoSource == NULL) {
    \n *env << "Unable to open file \\\\"" << inputFileName
    \n << "\\\\" as a byte-stream file source\\\\n";
    \n exit(1);
    \n }<\/p>\n

    Groupsock rtpGroupsock(*env, destinationAddress, rtpPortNum, ttl); \/\/ \u521b\u5efaRTP\u7ec4\u5957\u63a5\u5b57
    \n videoSink = H264VideoRTPSink::createNew(*env, &rtpGroupsock, 96); \/\/ \u521b\u5efa\u65b0\u7684H264\u89c6\u9891RTP\u63a5\u6536\u5668<\/p>\n

    \/\/ \u5f00\u59cb\u64ad\u653e
    \n *env << "Beginning to read from file…\\\\n";
    \n play();<\/p>\n

    env->taskScheduler().doEventLoop(); \/\/ \u8fdb\u5165\u4e8b\u4ef6\u5faa\u73af
    \n return 0; \/\/ \u8fd4\u56de0\u8868\u793a\u7a0b\u5e8f\u6b63\u5e38\u7ed3\u675f
    \n}<\/p>\n

    void afterPlaying(void* clientData) { \/\/ \u64ad\u653e\u7ed3\u675f\u540e\u7684\u56de\u8c03\u51fd\u6570
    \n *env << "…done reading from file\\\\n";
    \n videoSink->stopPlaying(); \/\/ \u505c\u6b62\u64ad\u653e
    \n Medium::close(videoSink); \/\/ \u5173\u95ed\u63a5\u6536\u5668
    \n Medium::close(videoSource); \/\/ \u5173\u95ed\u6e90
    \n exit(0); \/\/ \u9000\u51fa\u7a0b\u5e8f
    \n}<\/p>\n

    void play() { \/\/ \u64ad\u653e\u51fd\u6570
    \n videoSink->startPlaying(*videoSource, afterPlaying, videoSink); \/\/ \u5f00\u59cb\u64ad\u653e
    \n} <\/p>\n

    \u8fd9\u4e2a\u793a\u4f8b\u4e2d，\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2a\u4efb\u52a1\u8c03\u5ea6\u5668\u548c\u73af\u5883，\u7136\u540e\u521b\u5efa\u4e86\u4e00\u4e2a\u8f93\u5165\u6587\u4ef6\u6e90\u3002\u63a5\u7740，\u521b\u5efa\u4e86\u4e00\u4e2aRTP\u7ec4\u5957\u63a5\u5b57\u548c\u4e00\u4e2aH264\u89c6\u9891RTP\u63a5\u6536\u5668\u3002\u6700\u540e，\u5f00\u59cb\u64ad\u653e\u89c6\u9891，\u5e76\u5728\u64ad\u653e\u7ed3\u675f\u540e\u5173\u95ed\u63a5\u6536\u5668\u548c\u6e90\u3002<\/p>\n

    \u8fd9\u53ea\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b，\u5b9e\u9645\u7684RTSP\u670d\u52a1\u5668\u53ef\u80fd\u9700\u8981\u5904\u7406\u66f4\u591a\u7684\u590d\u6742\u60c5\u51b5，\u4f8b\u5982\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u7684\u8fde\u63a5，\u5904\u7406\u4e0d\u540c\u7684RTSP\u547d\u4ee4\u7b49\u7b49\u3002<\/p>\n

    \u56db\u3001YUV\u6570\u636e\u7684\u63d2\u5165\u4e0e\u5904\u7406<\/h3>\n

    4.1 YUV\u6570\u636e\u7684\u7406\u89e3<\/h3>\n

    YUV（\u4eae\u5ea6\u3001\u8272\u5ea6）\u662f\u4e00\u79cd\u989c\u8272\u7f16\u7801\u65b9\u6cd5，\u5e7f\u6cdb\u5e94\u7528\u4e8e\u89c6\u9891\u7cfb\u7edf\u3002\u5728YUV\u4e2d，Y\u4ee3\u8868\u4eae\u5ea6（Luminance），U\u548cV\u4ee3\u8868\u8272\u5ea6（Chrominance）\u3002YUV\u7f16\u7801\u7684\u4e3b\u8981\u601d\u60f3\u662f，\u4eba\u773c\u5bf9\u4eae\u5ea6\u4fe1\u606f\u7684\u654f\u611f\u5ea6\u8fdc\u9ad8\u4e8e\u8272\u5ea6\u4fe1\u606f，\u56e0\u6b64，\u901a\u8fc7\u5bf9\u8272\u5ea6\u4fe1\u606f\u8fdb\u884c\u964d\u91c7\u6837，\u53ef\u4ee5\u5728\u4fdd\u6301\u89c6\u89c9\u8d28\u91cf\u7684\u540c\u65f6，\u5b9e\u73b0\u6570\u636e\u538b\u7f29\u3002<\/p>\n

    YUV\u683c\u5f0f\u7684\u6570\u636e\u901a\u5e38\u4ee5\u4e09\u79cd\u5f62\u5f0f\u5b58\u5728：planar\u3001interleaved\u548csemi-planar\u3002\u5728planar\u683c\u5f0f\u4e2d，Y\u3001U\u3001V\u4e09\u4e2a\u5206\u91cf\u5206\u522b\u5b58\u50a8；\u5728interleaved\u683c\u5f0f\u4e2d，Y\u3001U\u3001V\u4e09\u4e2a\u5206\u91cf\u4ea4\u9519\u5b58\u50a8；\u5728semi-planar\u683c\u5f0f\u4e2d，Y\u5206\u91cf\u5355\u72ec\u5b58\u50a8，U\u548cV\u5206\u91cf\u4ea4\u9519\u5b58\u50a8\u3002<\/p>\n

    \u5728\u89c6\u9891\u7f16\u7801\u548c\u4f20\u8f93\u4e2d，YUV\u6570\u636e\u7684\u5904\u7406\u662f\u975e\u5e38\u5173\u952e\u7684\u4e00\u73af\u3002\u9996\u5148，\u6211\u4eec\u9700\u8981\u5c06RGB\u56fe\u50cf\u8f6c\u6362\u4e3aYUV\u683c\u5f0f\u3002\u7136\u540e，\u6211\u4eec\u53ef\u4ee5\u5bf9YUV\u6570\u636e\u8fdb\u884c\u5404\u79cd\u5904\u7406，\u5982\u964d\u91c7\u6837\u3001\u91cf\u5316\u7b49，\u4ee5\u5b9e\u73b0\u6570\u636e\u538b\u7f29\u3002\u6700\u540e，\u6211\u4eec\u9700\u8981\u5c06\u5904\u7406\u540e\u7684YUV\u6570\u636e\u63d2\u5165\u5230\u89c6\u9891\u6d41\u4e2d\u3002<\/p>\n

    \u5728C++\u4e2d，\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528OpenCV\u5e93\u6765\u5904\u7406YUV\u6570\u636e\u3002OpenCV\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u51fd\u6570，\u53ef\u4ee5\u65b9\u4fbf\u5730\u8fdb\u884cRGB\u548cYUV\u4e4b\u95f4\u7684\u8f6c\u6362，\u4ee5\u53caYUV\u6570\u636e\u7684\u5904\u7406\u3002\u4f8b\u5982，\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528cv::cvtColor\u51fd\u6570\u6765\u8fdb\u884c\u989c\u8272\u7a7a\u95f4\u7684\u8f6c\u6362\u3002<\/p>\n

    \u5728Live555\u4e2d，\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528DeviceSource\u7c7b\u6765\u63d2\u5165YUV\u6570\u636e\u3002DeviceSource\u7c7b\u63d0\u4f9b\u4e86\u4e00\u4e2adoGetNextFrame\u51fd\u6570，\u6211\u4eec\u53ef\u4ee5\u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d\u63d2\u5165\u6211\u4eec\u7684YUV\u6570\u636e\u3002\u5177\u4f53\u7684\u63d2\u5165\u65b9\u6cd5，\u6211\u4eec\u5c06\u5728\u4e0b\u4e00\u8282\u8fdb\u884c\u8be6\u7ec6\u4ecb\u7ecd\u3002<\/p>\n

    \u603b\u7684\u6765\u8bf4，\u7406\u89e3YUV\u6570\u636e\u7684\u5904\u7406，\u662f\u5b9e\u73b0\u9ad8\u6548\u89c6\u9891\u7f16\u7801\u548c\u4f20\u8f93\u7684\u5173\u952e\u3002\u5728\u63a5\u4e0b\u6765\u7684\u7ae0\u8282\u4e2d，\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u5728C++\u548cLive555\u4e2d\u5904\u7406YUV\u6570\u636e，\u4ee5\u53ca\u5982\u4f55\u89e3\u51b3\u4e00\u4e9b\u5e38\u89c1\u7684\u95ee\u9898\u3002<\/p>\n

    4.2 \u5982\u4f55\u63d2\u5165YUV\u6570\u636e<\/h3>\n

    \u5728Live555\u5e93\u4e2d，\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7DeviceSource\u7c7b\u6765\u63d2\u5165YUV\u6570\u636e\u3002DeviceSource\u7c7b\u662fFramedSource\u7c7b\u7684\u4e00\u4e2a\u5b50\u7c7b，\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2adoGetNextFrame()\u65b9\u6cd5，\u6211\u4eec\u53ef\u4ee5\u5728\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\u63d2\u5165\u6211\u4eec\u7684YUV\u6570\u636e\u3002<\/p>\n

    \u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b，\u5c55\u793a\u4e86\u5982\u4f55\u5728doGetNextFrame()\u65b9\u6cd5\u4e2d\u63d2\u5165YUV\u6570\u636e：<\/p>\n

    void DeviceSource::doGetNextFrame() {
    \n \/\/ \u83b7\u53d6YUV\u6570\u636e
    \n unsigned char* yuvData = getYUVData();<\/p>\n

    \/\/ \u68c0\u67e5\u662f\u5426\u6709\u8db3\u591f\u7684\u7a7a\u95f4\u6765\u5b58\u50a8YUV\u6570\u636e
    \n if (fMaxSize < fFrameSize) {
    \n fNumTruncatedBytes = fFrameSize – fMaxSize;
    \n fFrameSize = fMaxSize;
    \n } else {
    \n fNumTruncatedBytes = 0;
    \n }<\/p>\n

    \/\/ \u5c06YUV\u6570\u636e\u590d\u5236\u5230fTo
    \n memmove(fTo, yuvData, fFrameSize);<\/p>\n

    \/\/ \u5b8c\u6210\u83b7\u53d6\u5e27\u6570\u636e
    \n FramedSource::afterGetting(this);
    \n} <\/p>\n

    \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d，\u6211\u4eec\u9996\u5148\u83b7\u53d6YUV\u6570\u636e，\u7136\u540e\u68c0\u67e5\u662f\u5426\u6709\u8db3\u591f\u7684\u7a7a\u95f4\u6765\u5b58\u50a8\u8fd9\u4e9b\u6570\u636e\u3002\u5982\u679c\u6ca1\u6709\u8db3\u591f\u7684\u7a7a\u95f4，\u6211\u4eec\u5c06\u622a\u65ad\u4e00\u90e8\u5206\u6570\u636e\u3002\u7136\u540e，\u6211\u4eec\u5c06YUV\u6570\u636e\u590d\u5236\u5230fTo，\u8fd9\u662f\u4e00\u4e2a\u6307\u5411\u5b58\u50a8\u5e27\u6570\u636e\u7684\u7f13\u51b2\u533a\u7684\u6307\u9488\u3002\u6700\u540e，\u6211\u4eec\u8c03\u7528FramedSource::afterGetting(this)\u6765\u5b8c\u6210\u83b7\u53d6\u5e27\u6570\u636e\u3002<\/p>\n

    \u9700\u8981\u6ce8\u610f\u7684\u662f，\u8fd9\u53ea\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b，\u5b9e\u9645\u7684\u4ee3\u7801\u53ef\u80fd\u4f1a\u66f4\u590d\u6742\u3002\u4f8b\u5982，\u4f60\u53ef\u80fd\u9700\u8981\u5904\u7406YUV\u6570\u636e\u7684\u683c\u5f0f\u8f6c\u6362，\u6216\u8005\u5904\u7406YUV\u6570\u636e\u7684\u964d\u91c7\u6837\u7b49\u95ee\u9898\u3002\u6b64\u5916，\u4f60\u8fd8\u9700\u8981\u786e\u4fdd\u4f60\u7684\u4ee3\u7801\u662f\u7ebf\u7a0b\u5b89\u5168\u7684，\u56e0\u4e3aLive555\u5e93\u662f\u591a\u7ebf\u7a0b\u7684\u3002<\/p>\n

    Here\u2019s a code snippet from the Live555 library that deals with YUV data: <\/p>\n

    \/\/ "liveMedia" includes a software-only implementation of a H.264 video encoder:
    \n\/\/ "H264VideoStreamDiscreteFramer". This can be used – along with the "H264VideoStreamFramer" and "H264VideoRTPSink" classes – to implement a RTSP server that streams H.264 video (in RTP format). However, because this implementation is software-only (i.e., does not use hardware-accelerated encoding), it is too slow to be practical for most applications.<\/p>\n

    \/\/ The input to the "H264VideoStreamDiscreteFramer" is a sequence of 'nal units' (in Annex B format). Each 'nal unit' begins with the byte sequence 0x00000001, followed by the 'nal unit' data. (Note that 'nal units' are *not* the same as 'frames'; there can be multiple 'nal units' per frame.)<\/p>\n

    \/\/ To use this software-only implementation, you would need to provide your own code to generate these 'nal units'. Typically, this would involve:
    \n\/\/ 1\/ Getting video data (e.g., from a camera).
    \n\/\/ 2\/ Converting this video data to YUV format.
    \n\/\/ 3\/ Calling the "x264_encoder_encode()" function (defined in "x264.h") to encode this YUV data into a 'nal unit'.
    \n\/\/ 4\/ Calling "H264VideoStreamDiscreteFramer::inputFrame()" to deliver this 'nal unit' to the "H264VideoStreamDiscreteFramer". <\/p>\n

    This code snippet outlines the steps needed to process YUV data in the Live555 library. It involves getting video data, converting it to YUV format, encoding this YUV data into a \u2018nal unit\u2019 using the \u201cx264_encoder_encode()\u201d function, and then delivering this \u2018nal unit\u2019 to the \u201cH264VideoStreamDiscreteFramer\u201d using the \u201cinputFrame()\u201d function.
    \n Please note that this is a software-only implementation and does not use hardware-accelerated encoding, so it may be too slow for some applications.
    \n You can find this code in the Live555 GitHub repository. <\/p>\n

    4.3 YUV\u6570\u636e\u7684\u5904\u7406\u4e0e\u4f18\u5316（Processing and Optimization of YUV Data）<\/h3>\n

    \u5728\u5b9e\u9645\u7684RTSP\u670d\u52a1\u5668\u5f00\u53d1\u4e2d，\u6211\u4eec\u4e0d\u4ec5\u9700\u8981\u6b63\u786e\u5730\u63d2\u5165YUV\u6570\u636e，\u66f4\u9700\u8981\u5bf9\u5176\u8fdb\u884c\u6709\u6548\u7684\u5904\u7406\u548c\u4f18\u5316，\u4ee5\u63d0\u9ad8\u89c6\u9891\u6d41\u7684\u8d28\u91cf\u548c\u4f20\u8f93\u6548\u7387\u3002\u4ee5\u4e0b\u5c06\u4ece\u51e0\u4e2a\u5173\u952e\u7684\u65b9\u9762\u8fdb\u884c\u6df1\u5165\u7684\u63a2\u8ba8\u3002<\/p>\n

    \u9996\u5148，\u6211\u4eec\u9700\u8981\u7406\u89e3YUV\u6570\u636e\u7684\u7279\u6027\u3002YUV\u662f\u4e00\u79cd\u989c\u8272\u7f16\u7801\u65b9\u6cd5，\u5b83\u5c06\u56fe\u50cf\u7684\u4eae\u5ea6\u4fe1\u606f（Y）\u548c\u8272\u5ea6\u4fe1\u606f（UV）\u5206\u5f00\u5904\u7406\u3002\u8fd9\u79cd\u8bbe\u8ba1\u7684\u4f18\u70b9\u662f\u53ef\u4ee5\u6839\u636e\u4eba\u773c\u5bf9\u4eae\u5ea6\u548c\u8272\u5ea6\u4fe1\u606f\u7684\u654f\u611f\u5ea6\u8fdb\u884c\u4f18\u5316，\u4ece\u800c\u63d0\u9ad8\u56fe\u50cf\u7684\u89c6\u89c9\u8d28\u91cf\u3002\u5728\u5904\u7406YUV\u6570\u636e\u65f6，\u6211\u4eec\u9700\u8981\u8003\u8651\u8fd9\u4e9b\u7279\u6027，\u4ee5\u4fbf\u66f4\u597d\u5730\u4f18\u5316\u89c6\u9891\u6d41\u3002<\/p>\n

    \u5176\u6b21，\u6211\u4eec\u9700\u8981\u8003\u8651YUV\u6570\u636e\u7684\u683c\u5f0f\u3002YUV\u6570\u636e\u6709\u591a\u79cd\u683c\u5f0f，\u5982YUV420\u3001YUV422\u3001YUV444\u7b49，\u8fd9\u4e9b\u683c\u5f0f\u4e3b\u8981\u533a\u522b\u5728\u4e8e\u8272\u5ea6\u4fe1\u606f\u7684\u91c7\u6837\u7387\u3002\u5728\u9009\u62e9YUV\u683c\u5f0f\u65f6，\u6211\u4eec\u9700\u8981\u6839\u636e\u5b9e\u9645\u7684\u9700\u6c42\u548c\u9650\u5236\u8fdb\u884c\u9009\u62e9\u3002\u4f8b\u5982，\u5982\u679c\u6211\u4eec\u7684\u7f51\u7edc\u5e26\u5bbd\u6709\u9650，\u6211\u4eec\u53ef\u80fd\u4f1a\u9009\u62e9YUV420，\u56e0\u4e3a\u5b83\u7684\u8272\u5ea6\u4fe1\u606f\u91c7\u6837\u7387\u8f83\u4f4e，\u53ef\u4ee5\u51cf\u5c11\u6570\u636e\u91cf\u3002\u4f46\u662f，\u8fd9\u4e5f\u53ef\u80fd\u4f1a\u964d\u4f4e\u56fe\u50cf\u7684\u8272\u5f69\u8d28\u91cf\u3002\u56e0\u6b64，\u6211\u4eec\u9700\u8981\u5728\u6570\u636e\u91cf\u548c\u56fe\u50cf\u8d28\u91cf\u4e4b\u95f4\u627e\u5230\u4e00\u4e2a\u5e73\u8861\u3002<\/p>\n

    \u518d\u6b21，\u6211\u4eec\u9700\u8981\u8003\u8651YUV\u6570\u636e\u7684\u8f6c\u6362\u3002\u5728\u5b9e\u9645\u7684\u5e94\u7528\u4e2d，\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5c06YUV\u6570\u636e\u8f6c\u6362\u4e3a\u5176\u4ed6\u683c\u5f0f，\u5982RGB\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u9700\u8981\u4e00\u4e9b\u6570\u5b66\u8fd0\u7b97，\u6211\u4eec\u9700\u8981\u786e\u4fdd\u8fd9\u4e9b\u8fd0\u7b97\u7684\u6b63\u786e\u6027\u548c\u6548\u7387\u3002\u6b64\u5916，\u6211\u4eec\u8fd8\u9700\u8981\u8003\u8651\u5982\u4f55\u5904\u7406\u8f6c\u6362\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u51fa\u73b0\u7684\u95ee\u9898，\u5982\u989c\u8272\u5931\u771f\u3001\u8fb9\u7f18\u952f\u9f7f\u7b49\u3002<\/p>\n

    \u6700\u540e，\u6211\u4eec\u9700\u8981\u8003\u8651YUV\u6570\u636e\u7684\u538b\u7f29\u3002\u5728\u89c6\u9891\u6d41\u4f20\u8f93\u4e2d，\u6570\u636e\u538b\u7f29\u662f\u975e\u5e38\u91cd\u8981\u7684，\u5b83\u53ef\u4ee5\u5927\u5927\u51cf\u5c11\u6570\u636e\u91cf，\u63d0\u9ad8\u4f20\u8f93\u6548\u7387\u3002\u4f46\u662f，\u6570\u636e\u538b\u7f29\u4e5f\u53ef\u80fd\u4f1a\u964d\u4f4e\u56fe\u50cf\u8d28\u91cf\u3002\u56e0\u6b64，\u6211\u4eec\u9700\u8981\u9009\u62e9\u5408\u9002\u7684\u538b\u7f29\u7b97\u6cd5，\u5e76\u5bf9\u5176\u8fdb\u884c\u4f18\u5316，\u4ee5\u8fbe\u5230\u6700\u4f73\u7684\u538b\u7f29\u6548\u679c\u3002<\/p>\n

    \u603b\u7684\u6765\u8bf4，\u5904\u7406\u548c\u4f18\u5316YUV\u6570\u636e\u662f\u4e00\u4e2a\u590d\u6742\u7684\u8fc7\u7a0b，\u5b83\u6d89\u53ca\u5230\u8bb8\u591a\u56e0\u7d20\u548c\u6280\u672f\u3002\u6211\u4eec\u9700\u8981\u6df1\u5165\u7406\u89e3YUV\u6570\u636e\u7684\u7279\u6027，\u638c\u63e1\u76f8\u5173\u7684\u6280\u672f\u548c\u65b9\u6cd5，\u624d\u80fd\u6709\u6548\u5730\u5904\u7406\u548c\u4f18\u5316YUV\u6570\u636e，\u63d0\u9ad8RTSP\u670d\u52a1\u5668\u7684\u6027\u80fd\u548c\u8d28\u91cf\u3002<\/p>\n

    \u4e94\u3001I\u5e27\u4e0eP\u5e27\u7684\u987a\u5e8f\u95ee\u9898（Order of I-frames and P-frames）<\/h3>\n

    5.1 I\u5e27\u4e0eP\u5e27\u7684\u57fa\u672c\u7406\u89e3（Basic Understanding of I-frames and P-frames）<\/h3>\n

    \u5728\u89c6\u9891\u7f16\u7801\u4e2d，I\u5e27（Intra-coded Picture）\u548cP\u5e27（Predicted Picture）\u662f\u4e24\u79cd\u5173\u952e\u7684\u5e27\u7c7b\u578b\u3002\u5b83\u4eec\u5728\u89c6\u9891\u6d41\u4e2d\u8d77\u7740\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528，\u7406\u89e3\u5b83\u4eec\u7684\u7279\u6027\u548c\u529f\u80fd\u5bf9\u4e8e\u6df1\u5165\u638c\u63e1\u89c6\u9891\u7f16\u7801\u548c\u89e3\u7801\u6280\u672f\u975e\u5e38\u91cd\u8981\u3002<\/p>\n

    I\u5e27，\u4e5f\u88ab\u79f0\u4e3a\u5173\u952e\u5e27（Key Frame），\u662f\u89c6\u9891\u7f16\u7801\u4e2d\u7684\u4e00\u4e2a\u5b8c\u6574\u7684\u56fe\u50cf\u5e27\u3002\u5b83\u662f\u81ea\u6211\u5b8c\u6574\u7684，\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u5e27\u5c31\u53ef\u4ee5\u5b8c\u5168\u89e3\u7801\u3002I\u5e27\u901a\u5e38\u6bd4\u5176\u4ed6\u7c7b\u578b\u7684\u5e27\u8981\u5927，\u56e0\u4e3a\u5b83\u5305\u542b\u4e86\u4e00\u4e2a\u5b8c\u6574\u7684\u56fe\u50cf\u4fe1\u606f\u3002\u5728\u89c6\u9891\u6d41\u4e2d，I\u5e27\u662f\u5176\u4ed6\u5e27（\u5982P\u5e27\u548cB\u5e27）\u7684\u53c2\u8003\u5e27，\u5b83\u4eec\u7684\u5b58\u5728\u4f7f\u5f97\u89c6\u9891\u53ef\u4ee5\u8fdb\u884c\u968f\u673a\u8bbf\u95ee，\u4e5f\u5c31\u662f\u8bf4，\u53ea\u6709\u5728I\u5e27\u7684\u57fa\u7840\u4e0a，\u6211\u4eec\u624d\u80fd\u51c6\u786e\u5730\u8df3\u8f6c\u5230\u89c6\u9891\u7684\u4efb\u4f55\u4f4d\u7f6e\u3002<\/p>\n

    P\u5e27，\u4e5f\u88ab\u79f0\u4e3a\u9884\u6d4b\u5e27，\u5b83\u4e0d\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u56fe\u50cf\u5e27，\u800c\u662f\u57fa\u4e8e\u524d\u4e00\u4e2aI\u5e27\u6216P\u5e27\u7684\u5dee\u5f02\u4fe1\u606f\u3002\u4e0eI\u5e27\u76f8\u6bd4，P\u5e27\u7684\u6570\u636e\u91cf\u8981\u5c0f\u5f97\u591a，\u56e0\u4e3a\u5b83\u53ea\u5305\u542b\u4e86\u4e0e\u524d\u4e00\u5e27\u7684\u5dee\u5f02\u4fe1\u606f，\u800c\u4e0d\u662f\u5b8c\u6574\u7684\u56fe\u50cf\u4fe1\u606f\u3002P\u5e27\u7684\u5b58\u5728\u4f7f\u5f97\u89c6\u9891\u6d41\u53ef\u4ee5\u5927\u5927\u51cf\u5c0f，\u4ece\u800c\u8282\u7701\u4e86\u5b58\u50a8\u548c\u4f20\u8f93\u7684\u5e26\u5bbd\u3002<\/p>\n

    \u5728\u89c6\u9891\u7f16\u7801\u4e2d，I\u5e27\u548cP\u5e27\u7684\u987a\u5e8f\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u4e00\u822c\u6765\u8bf4，\u89c6\u9891\u6d41\u5f00\u59cb\u7684\u4f4d\u7f6e\u662f\u4e00\u4e2aI\u5e27，\u7136\u540e\u662f\u4e00\u7cfb\u5217\u7684P\u5e27\u3002\u8fd9\u79cd\u987a\u5e8f\u7684\u5b58\u5728，\u4f7f\u5f97\u89c6\u9891\u53ef\u4ee5\u4eceI\u5e27\u5f00\u59cb\u8fdb\u884c\u89e3\u7801，\u7136\u540e\u6839\u636eP\u5e27\u7684\u5dee\u5f02\u4fe1\u606f\u9010\u5e27\u89e3\u7801，\u4ece\u800c\u91cd\u5efa\u51fa\u5b8c\u6574\u7684\u89c6\u9891\u5e8f\u5217\u3002<\/p>\n

    \u7136\u800c，\u5982\u679cI\u5e27\u548cP\u5e27\u7684\u987a\u5e8f\u51fa\u73b0\u9519\u8bef，\u90a3\u4e48\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89c6\u9891\u7684\u89e3\u7801\u51fa\u73b0\u95ee\u9898\u3002\u4f8b\u5982，\u5982\u679c\u4e00\u4e2aP\u5e27\u7684\u53c2\u8003\u5e27（\u5373\u524d\u4e00\u4e2aI\u5e27\u6216P\u5e27）\u4e22\u5931\u6216\u9519\u8bef，\u90a3\u4e48\u8fd9\u4e2aP\u5e27\u5c31\u65e0\u6cd5\u6b63\u786e\u89e3\u7801，\u4ece\u800c\u53ef\u80fd\u5bfc\u81f4\u89c6\u9891\u51fa\u73b0\u4e71\u7801\u6216\u8005\u64ad\u653e\u4e0d\u987a\u7545\u7684\u95ee\u9898\u3002<\/p>\n

    \u56e0\u6b64，\u6b63\u786e\u5730\u63a7\u5236I\u5e27\u548cP\u5e27\u7684\u987a\u5e8f，\u662f\u4fdd\u8bc1\u89c6\u9891\u8d28\u91cf\u7684\u4e00\u4e2a\u91cd\u8981\u56e0\u7d20\u3002\u5728\u5b9e\u9645\u7684\u7f16\u7a0b\u4e2d，\u6211\u4eec\u9700\u8981\u6df1\u5165\u7406\u89e3I\u5e27\u548cP\u5e27\u7684\u7279\u6027，\u4ee5\u53ca\u5b83\u4eec\u5728\u89c6\u9891\u7f16\u7801\u4e2d\u7684\u4f5c\u7528，\u624d\u80fd\u66f4\u597d\u5730\u63a7\u5236\u89c6\u9891\u7684\u7f16\u7801\u548c\u89e3\u7801\u8fc7\u7a0b\u3002<\/p>\n

    \u5728\u5b9e\u9645\u7684\u7f16\u7a0b\u5b9e\u8df5\u4e2d，\u6211\u4eec\u901a\u5e38\u4f1a\u4f7f\u7528\u4e00\u79cd\u79f0\u4e3aGOP（Group of Pictures）\u7684\u7ed3\u6784\u6765\u63a7\u5236I\u5e27\u548cP\u5e27\u7684\u987a\u5e8f\u3002\u4e00\u4e2aGOP\u662f\u7531\u4e00\u4e2aI\u5e27\u548c\u968f\u540e\u7684\u4e00\u7cfb\u5217P\u5e27\u7ec4\u6210\u7684，\u5b83\u4ee3\u8868\u4e86\u4e00\u4e2a\u5b8c\u6574\u7684\u89c6\u9891\u5e8f\u5217\u3002\u5728\u4e00\u4e2aGOP\u4e2d，I\u5e27\u662f\u9996\u5e27，\u7136\u540e\u662f\u4e00\u7cfb\u5217\u7684P\u5e27\u3002\u8fd9\u79cd\u7ed3\u6784\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u5728\u6bcf\u4e2aGOP\u5f00\u59cb\u7684\u4f4d\u7f6e\u63d2\u5165\u4e00\u4e2aI\u5e27，\u7136\u540e\u6839\u636e\u89c6\u9891\u7684\u53d8\u5316\u60c5\u51b5\u63d2\u5165P\u5e27，\u4ece\u800c\u4fdd\u8bc1\u4e86I\u5e27\u548cP\u5e27\u7684\u6b63\u786e\u987a\u5e8f\u3002<\/p>\n

    \u5728\u5b9e\u9645\u7684\u7f16\u7a0b\u5b9e\u8df5\u4e2d，\u6211\u4eec\u8fd8\u9700\u8981\u6ce8\u610fI\u5e27\u548cP\u5e27\u7684\u6570\u91cf\u548c\u6bd4\u4f8b\u3002\u4e00\u822c\u6765\u8bf4，I\u5e27\u7684\u6570\u91cf\u5e94\u8be5\u5c3d\u53ef\u80fd\u5c11，\u56e0\u4e3aI\u5e27\u7684\u6570\u636e\u91cf\u5927，\u4f1a\u5360\u7528\u66f4\u591a\u7684\u5b58\u50a8\u548c\u4f20\u8f93\u5e26\u5bbd\u3002\u800cP\u5e27\u7684\u6570\u91cf\u5e94\u8be5\u5c3d\u53ef\u80fd\u591a，\u56e0\u4e3aP\u5e27\u7684\u6570\u636e\u91cf\u5c0f，\u53ef\u4ee5\u6709\u6548\u5730\u51cf\u5c0f\u89c6\u9891\u6d41\u7684\u5927\u5c0f\u3002\u7136\u800c，\u5982\u679cP\u5e27\u7684\u6570\u91cf\u8fc7\u591a，\u90a3\u4e48\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89c6\u9891\u7684\u8d28\u91cf\u4e0b\u964d，\u56e0\u4e3aP\u5e27\u662f\u57fa\u4e8e\u524d\u4e00\u5e27\u7684\u5dee\u5f02\u4fe1\u606f，\u5982\u679c\u5dee\u5f02\u4fe1\u606f\u8fc7\u591a，\u90a3\u4e48\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89c6\u9891\u7684\u8d28\u91cf\u4e0b\u964d\u3002<\/p>\n

    \u603b\u7684\u6765\u8bf4，\u7406\u89e3\u548c\u638c\u63e1I\u5e27\u548cP\u5e27\u7684\u7279\u6027，\u4ee5\u53ca\u5b83\u4eec\u5728\u89c6\u9891\u7f16\u7801\u4e2d\u7684\u4f5c\u7528，\u662f\u6211\u4eec\u8fdb\u884c\u89c6\u9891\u7f16\u7a0b\u7684\u4e00\u4e2a\u91cd\u8981\u57fa\u7840\u3002\u53ea\u6709\u6df1\u5165\u7406\u89e3\u8fd9\u4e9b\u57fa\u672c\u6982\u5ff5，\u6211\u4eec\u624d\u80fd\u66f4\u597d\u5730\u63a7\u5236\u89c6\u9891\u7684\u7f16\u7801\u548c\u89e3\u7801\u8fc7\u7a0b，\u4ece\u800c\u5b9e\u73b0\u9ad8\u8d28\u91cf\u7684\u89c6\u9891\u64ad\u653e\u3002<\/p>\n

    5.2 I\u5e27\u4e0eP\u5e27\u7684\u987a\u5e8f\u5bf9\u89c6\u9891\u8d28\u91cf\u7684\u5f71\u54cd（Impact of I-frame and P-frame Order on Video Quality）<\/h3>\n

    I\u5e27\u548cP\u5e27\u7684\u987a\u5e8f\u5bf9\u89c6\u9891\u8d28\u91cf\u7684\u5f71\u54cd\u662f\u663e\u8457\u7684\u3002\u9996\u5148，\u6211\u4eec\u9700\u8981\u7406\u89e3，I\u5e27\u662f\u5b8c\u6574\u7684\u56fe\u50cf\u5e27，\u800cP\u5e27\u662f\u57fa\u4e8e\u524d\u4e00\u5e27\u7684\u5dee\u5f02\u4fe1\u606f\u3002\u56e0\u6b64，\u5982\u679cI\u5e27\u548cP\u5e27\u7684\u987a\u5e8f\u51fa\u73b0\u9519\u8bef，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89c6\u9891\u8d28\u91cf\u4e0b\u964d\u3002<\/p>\n

    \u5728\u4e00\u4e2a\u6b63\u5e38\u7684\u89c6\u9891\u6d41\u4e2d，I\u5e27\u662f\u9996\u5e27，\u7136\u540e\u662f\u4e00\u7cfb\u5217\u7684P\u5e27\u3002\u8fd9\u79cd\u987a\u5e8f\u7684\u5b58\u5728，\u4f7f\u5f97\u89c6\u9891\u53ef\u4ee5\u4eceI\u5e27\u5f00\u59cb\u8fdb\u884c\u89e3\u7801，\u7136\u540e\u6839\u636eP\u5e27\u7684\u5dee\u5f02\u4fe1\u606f\u9010\u5e27\u89e3\u7801，\u4ece\u800c\u91cd\u5efa\u51fa\u5b8c\u6574\u7684\u89c6\u9891\u5e8f\u5217\u3002\u5982\u679c\u8fd9\u4e2a\u987a\u5e8f\u88ab\u6253\u4e71，\u4f8b\u5982，\u4e00\u4e2aP\u5e27\u7684\u53c2\u8003\u5e27（\u5373\u524d\u4e00\u4e2aI\u5e27\u6216P\u5e27）\u4e22\u5931\u6216\u9519\u8bef，\u90a3\u4e48\u8fd9\u4e2aP\u5e27\u5c31\u65e0\u6cd5\u6b63\u786e\u89e3\u7801，\u4ece\u800c\u53ef\u80fd\u5bfc\u81f4\u89c6\u9891\u51fa\u73b0\u4e71\u7801\u6216\u8005\u64ad\u653e\u4e0d\u987a\u7545\u7684\u95ee\u9898\u3002<\/p>\n

    \u6b64\u5916，I\u5e27\u548cP\u5e27\u7684\u987a\u5e8f\u4e5f\u4f1a\u5f71\u54cd\u89c6\u9891\u7684\u64ad\u653e\u6027\u80fd\u3002\u7531\u4e8eI\u5e27\u662f\u5b8c\u6574\u7684\u56fe\u50cf\u5e27，\u5176\u6570\u636e\u91cf\u6bd4P\u5e27\u5927，\u56e0\u6b64，\u5982\u679cI\u5e27\u7684\u6570\u91cf\u8fc7\u591a，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89c6\u9891\u6d41\u7684\u5927\u5c0f\u589e\u52a0，\u4ece\u800c\u589e\u52a0\u4e86\u5b58\u50a8\u548c\u4f20\u8f93\u7684\u8d1f\u62c5\u3002\u76f8\u53cd，\u5982\u679cP\u5e27\u7684\u6570\u91cf\u8fc7\u591a，\u7531\u4e8eP\u5e27\u662f\u57fa\u4e8e\u524d\u4e00\u5e27\u7684\u5dee\u5f02\u4fe1\u606f，\u5982\u679c\u5dee\u5f02\u4fe1\u606f\u8fc7\u591a，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89c6\u9891\u7684\u8d28\u91cf\u4e0b\u964d\u3002<\/p>\n

    \u56e0\u6b64，\u6b63\u786e\u5730\u63a7\u5236I\u5e27\u548cP\u5e27\u7684\u987a\u5e8f，\u662f\u4fdd\u8bc1\u89c6\u9891\u8d28\u91cf\u7684\u4e00\u4e2a\u91cd\u8981\u56e0\u7d20\u3002\u5728\u5b9e\u9645\u7684\u7f16\u7a0b\u4e2d，\u6211\u4eec\u9700\u8981\u6df1\u5165\u7406\u89e3I\u5e27\u548cP\u5e27\u7684\u7279\u6027，\u4ee5\u53ca\u5b83\u4eec\u5728\u89c6\u9891\u7f16\u7801\u4e2d\u7684\u4f5c\u7528，\u624d\u80fd\u66f4\u597d\u5730\u63a7\u5236\u89c6\u9891\u7684\u7f16\u7801\u548c\u89e3\u7801\u8fc7\u7a0b，\u4ece\u800c\u5b9e\u73b0\u9ad8\u8d28\u91cf\u7684\u89c6\u9891\u64ad\u653e\u3002<\/p>\n

    5.3 \u89e3\u51b3I\u5e27\u4e0eP\u5e27\u987a\u5e8f\u95ee\u9898\u7684\u7b56\u7565（Strategies to Solve the Order Problem of I-frames and P-frames）<\/h3>\n

    \u89e3\u51b3I\u5e27\u4e0eP\u5e27\u987a\u5e8f\u95ee\u9898\u7684\u7b56\u7565\u4e3b\u8981\u6d89\u53ca\u5230\u7f16\u7801\u7b56\u7565\u548c\u89e3\u7801\u7b56\u7565\u4e24\u4e2a\u65b9\u9762\u3002<\/p>\n

    \u7f16\u7801\u7b56\u7565：<\/h4>\n
  • \u5408\u7406\u8bbe\u7f6eGOP（Group of Pictures）\u7ed3\u6784：\u5728\u7f16\u7801\u8fc7\u7a0b\u4e2d，\u6211\u4eec\u901a\u5e38\u4f1a\u4f7f\u7528GOP\u7ed3\u6784\u6765\u63a7\u5236I\u5e27\u548cP\u5e27\u7684\u987a\u5e8f\u3002\u4e00\u4e2aGOP\u7531\u4e00\u4e2aI\u5e27\u548c\u968f\u540e\u7684\u4e00\u7cfb\u5217P\u5e27\u7ec4\u6210\u3002\u5728\u8bbe\u7f6eGOP\u7ed3\u6784\u65f6，\u9700\u8981\u8003\u8651\u5230\u89c6\u9891\u7684\u5185\u5bb9\u7279\u6027，\u4f8b\u5982，\u5982\u679c\u89c6\u9891\u5185\u5bb9\u53d8\u5316\u8f83\u5927，\u53ef\u80fd\u9700\u8981\u66f4\u9891\u7e41\u5730\u63d2\u5165I\u5e27\u3002<\/li>\n
  • \u52a8\u6001\u8c03\u6574I\u5e27\u548cP\u5e27\u7684\u6bd4\u4f8b：\u5728\u7f16\u7801\u8fc7\u7a0b\u4e2d，\u53ef\u4ee5\u6839\u636e\u89c6\u9891\u5185\u5bb9\u7684\u53d8\u5316\u52a8\u6001\u8c03\u6574I\u5e27\u548cP\u5e27\u7684\u6bd4\u4f8b\u3002\u4f8b\u5982，\u5982\u679c\u89c6\u9891\u5185\u5bb9\u53d8\u5316\u8f83\u5927，\u53ef\u4ee5\u589e\u52a0I\u5e27\u7684\u6bd4\u4f8b；\u5982\u679c\u89c6\u9891\u5185\u5bb9\u53d8\u5316\u8f83\u5c0f，\u53ef\u4ee5\u589e\u52a0P\u5e27\u7684\u6bd4\u4f8b\u3002<\/li>\n

    \u89e3\u7801\u7b56\u7565：<\/h4>\n
  • \u9519\u8bef\u6062\u590d\u673a\u5236：\u5728\u89e3\u7801\u8fc7\u7a0b\u4e2d，\u5982\u679c\u53d1\u73b0I\u5e27\u6216P\u5e27\u4e22\u5931\u6216\u9519\u8bef，\u53ef\u4ee5\u91c7\u7528\u4e00\u4e9b\u9519\u8bef\u6062\u590d\u673a\u5236，\u4f8b\u5982，\u4f7f\u7528\u524d\u4e00\u5e27\u6216\u540e\u4e00\u5e27\u6765\u66ff\u4ee3\u4e22\u5931\u6216\u9519\u8bef\u7684\u5e27，\u6216\u8005\u4f7f\u7528\u63d2\u503c\u7b49\u65b9\u6cd5\u8fdb\u884c\u6062\u590d\u3002<\/li>\n
  • \u7f13\u51b2\u533a\u7ba1\u7406：\u5728\u89e3\u7801\u8fc7\u7a0b\u4e2d，\u53ef\u4ee5\u901a\u8fc7\u5408\u7406\u7ba1\u7406\u7f13\u51b2\u533a\u6765\u907f\u514dI\u5e27\u548cP\u5e27\u7684\u987a\u5e8f\u95ee\u9898\u3002\u4f8b\u5982，\u53ef\u4ee5\u8bbe\u7f6e\u4e00\u4e2a\u8db3\u591f\u5927\u7684\u7f13\u51b2\u533a，\u4ee5\u786e\u4fdd\u6240\u6709\u7684I\u5e27\u548cP\u5e27\u90fd\u80fd\u88ab\u6b63\u786e\u5730\u5b58\u50a8\u548c\u5904\u7406\u3002<\/li>\n

    \u603b\u7684\u6765\u8bf4，\u89e3\u51b3I\u5e27\u4e0eP\u5e27\u987a\u5e8f\u95ee\u9898\u9700\u8981\u4ece\u7f16\u7801\u548c\u89e3\u7801\u4e24\u4e2a\u65b9\u9762\u8fdb\u884c\u8003\u8651，\u901a\u8fc7\u5408\u7406\u7684\u7b56\u7565\u548c\u6280\u672f，\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898，\u4ece\u800c\u4fdd\u8bc1\u89c6\u9891\u7684\u8d28\u91cf\u548c\u64ad\u653e\u6027\u80fd\u3002<\/p>\n

    \u516d\u3001GOP\u56fe\u50cf\u7ec4\u7684\u7406\u89e3\u4e0e\u5e94\u7528（Understanding and Application of GOP）<\/h3>\n

    6.1 GOP\u56fe\u50cf\u7ec4\u7684\u57fa\u672c\u6982\u5ff5（Basic Concept of GOP）<\/h3>\n

    GOP（Group of Pictures）\u56fe\u50cf\u7ec4\u662f\u89c6\u9891\u538b\u7f29\u7f16\u7801\u4e2d\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\u3002\u5728MPEG\u89c6\u9891\u7f16\u7801\u6807\u51c6\u4e2d，GOP\u662f\u7531\u8fde\u7eed\u7684\u89c6\u9891\u5e27\u7ec4\u6210\u7684\u5e8f\u5217，\u8fd9\u4e9b\u5e27\u5305\u62ecI\u5e27\u3001P\u5e27\u548cB\u5e27\u3002<\/p>\n

      \n
    • I\u5e27（Intra-coded Picture）：\u4e5f\u79f0\u4e3a\u5173\u952e\u5e27，\u662f\u81ea\u6211\u5b8c\u6574\u7684\u5e27，\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u4efb\u4f55\u5e27\u8fdb\u884c\u89e3\u7801\u3002I\u5e27\u5728\u89c6\u9891\u4e2d\u8d77\u5230\u4e86\u5173\u952e\u7684\u4f5c\u7528，\u5b83\u662f\u6bcf\u4e2aGOP\u7684\u7b2c\u4e00\u5e27，\u4e5f\u662fP\u5e27\u548cB\u5e27\u7684\u53c2\u8003\u5e27\u3002I\u5e27\u7684\u6570\u636e\u91cf\u6700\u5927，\u4f46\u89e3\u7801\u590d\u6742\u5ea6\u6700\u4f4e\u3002<\/li>\n
    • P\u5e27（Predicted Picture）：\u4e5f\u79f0\u4e3a\u9884\u6d4b\u5e27，\u5b83\u4f9d\u8d56\u4e8e\u524d\u9762\u7684I\u5e27\u6216P\u5e27\u8fdb\u884c\u89e3\u7801\u3002P\u5e27\u5305\u542b\u4e86\u4e0e\u53c2\u8003\u5e27\u7684\u5dee\u5f02\u4fe1\u606f，\u56e0\u6b64\u6570\u636e\u91cf\u6bd4I\u5e27\u5c0f，\u89e3\u7801\u590d\u6742\u5ea6\u6bd4I\u5e27\u9ad8\u3002<\/li>\n
    • B\u5e27（Bidirectional Predicted Picture）：\u4e5f\u79f0\u4e3a\u53cc\u5411\u9884\u6d4b\u5e27，\u5b83\u4f9d\u8d56\u4e8e\u524d\u540e\u7684I\u5e27\u6216P\u5e27\u8fdb\u884c\u89e3\u7801\u3002B\u5e27\u5305\u542b\u4e86\u4e0e\u524d\u540e\u53c2\u8003\u5e27\u7684\u5dee\u5f02\u4fe1\u606f，\u56e0\u6b64\u6570\u636e\u91cf\u6700\u5c0f，\u4f46\u89e3\u7801\u590d\u6742\u5ea6\u6700\u9ad8\u3002<\/li>\n<\/ul>\n

      \u5728\u4e00\u4e2aGOP\u4e2d，I\u5e27\u3001P\u5e27\u548cB\u5e27\u7684\u6392\u5217\u987a\u5e8f\u548c\u6570\u91cf\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u9700\u8981\u8fdb\u884c\u8c03\u6574\u3002\u901a\u5e38，\u4e00\u4e2aGOP\u7684\u5f00\u59cb\u662f\u4e00\u4e2aI\u5e27，\u7136\u540e\u662f\u4e00\u4e9bP\u5e27\u548cB\u5e27\u3002I\u5e27\u7684\u95f4\u9694（\u4e5f\u5c31\u662fGOP\u7684\u5927\u5c0f）\u4f1a\u5f71\u54cd\u5230\u89c6\u9891\u7684\u538b\u7f29\u6548\u7387\u548c\u9519\u8bef\u6062\u590d\u80fd\u529b\u3002GOP\u7684\u5927\u5c0f\u8bbe\u7f6e\u5f97\u8d8a\u5927，\u538b\u7f29\u6548\u7387\u8d8a\u9ad8，\u4f46\u9519\u8bef\u6062\u590d\u80fd\u529b\u8d8a\u5f31；\u53cd\u4e4b，GOP\u7684\u5927\u5c0f\u8bbe\u7f6e\u5f97\u8d8a\u5c0f，\u538b\u7f29\u6548\u7387\u8d8a\u4f4e，\u4f46\u9519\u8bef\u6062\u590d\u80fd\u529b\u8d8a\u5f3a\u3002<\/p>\n

      \u5728\u5b9e\u9645\u5e94\u7528\u4e2d，\u6211\u4eec\u9700\u8981\u6839\u636e\u7f51\u7edc\u73af\u5883\u3001\u5b58\u50a8\u7a7a\u95f4\u3001\u89c6\u9891\u8d28\u91cf\u7b49\u591a\u65b9\u9762\u56e0\u7d20，\u5408\u7406\u8bbe\u7f6eGOP\u7684\u5927\u5c0f\u548cI\u5e27\u3001P\u5e27\u3001B\u5e27\u7684\u6bd4\u4f8b，\u4ee5\u8fbe\u5230\u6700\u4f18\u7684\u89c6\u9891\u538b\u7f29\u6548\u679c\u3002<\/p>\n

      6.2 GOP\u5728RTSP\u670d\u52a1\u5668\u4e2d\u7684\u4f5c\u7528（Role of GOP in RTSP Server）<\/h3>\n

      \u5728RTSP（Real Time Streaming Protocol）\u670d\u52a1\u5668\u4e2d，GOP（Group of Pictures）\u56fe\u50cf\u7ec4\u7684\u4f5c\u7528\u4e3b\u8981\u4f53\u73b0\u5728\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762：<\/p>\n

    • \u89c6\u9891\u538b\u7f29：GOP\u662f\u89c6\u9891\u538b\u7f29\u7f16\u7801\u4e2d\u7684\u4e00\u4e2a\u57fa\u672c\u5355\u4f4d\u3002\u901a\u8fc7\u5408\u7406\u8bbe\u7f6eGOP\u7684\u5927\u5c0f\u548cI\u5e27\u3001P\u5e27\u3001B\u5e27\u7684\u6bd4\u4f8b，\u53ef\u4ee5\u6709\u6548\u5730\u538b\u7f29\u89c6\u9891\u6570\u636e，\u51cf\u5c11\u7f51\u7edc\u4f20\u8f93\u548c\u5b58\u50a8\u7684\u538b\u529b\u3002<\/li>\n
    • \u9519\u8bef\u6062\u590d：\u5728\u7f51\u7edc\u4f20\u8f93\u8fc7\u7a0b\u4e2d，\u7531\u4e8e\u5404\u79cd\u539f\u56e0\u53ef\u80fd\u4f1a\u51fa\u73b0\u6570\u636e\u4e22\u5931\u7684\u60c5\u51b5\u3002\u8fd9\u65f6，\u5982\u679c\u4e22\u5931\u7684\u662fI\u5e27，\u90a3\u4e48\u540e\u7eed\u7684P\u5e27\u548cB\u5e27\u90fd\u65e0\u6cd5\u6b63\u5e38\u89e3\u7801，\u76f4\u5230\u4e0b\u4e00\u4e2aI\u5e27\u51fa\u73b0\u3002\u56e0\u6b64，\u901a\u8fc7\u8c03\u6574GOP\u7684\u5927\u5c0f，\u53ef\u4ee5\u5728\u538b\u7f29\u6548\u7387\u548c\u9519\u8bef\u6062\u590d\u80fd\u529b\u4e4b\u95f4\u627e\u5230\u4e00\u4e2a\u5e73\u8861\u3002<\/li>\n
    • \u89c6\u9891\u8d28\u91cf\u63a7\u5236：I\u5e27\u3001P\u5e27\u548cB\u5e27\u7684\u6570\u636e\u91cf\u548c\u89e3\u7801\u590d\u6742\u5ea6\u4e0d\u540c，\u5bf9\u89c6\u9891\u8d28\u91cf\u7684\u5f71\u54cd\u4e5f\u4e0d\u540c\u3002\u901a\u5e38，I\u5e27\u7684\u89c6\u9891\u8d28\u91cf\u6700\u9ad8，B\u5e27\u7684\u89c6\u9891\u8d28\u91cf\u6700\u4f4e\u3002\u56e0\u6b64，\u901a\u8fc7\u8c03\u6574I\u5e27\u3001P\u5e27\u548cB\u5e27\u7684\u6bd4\u4f8b，\u53ef\u4ee5\u5bf9\u89c6\u9891\u8d28\u91cf\u8fdb\u884c\u4e00\u5b9a\u7a0b\u5ea6\u7684\u63a7\u5236\u3002<\/li>\n
    • \u89c6\u9891\u64ad\u653e\u63a7\u5236：\u5728\u5b9e\u73b0\u89c6\u9891\u7684\u5feb\u8fdb\u3001\u5feb\u9000\u3001\u6682\u505c\u7b49\u64ad\u653e\u63a7\u5236\u529f\u80fd\u65f6，GOP\u4e5f\u8d77\u5230\u4e86\u5173\u952e\u7684\u4f5c\u7528\u3002\u4f8b\u5982，\u5feb\u8fdb\u65f6\u53ef\u4ee5\u8df3\u8fc7\u4e00\u4e9bGOP，\u5feb\u9000\u65f6\u53ef\u4ee5\u56de\u9000\u5230\u524d\u4e00\u4e2aGOP\u7684\u5f00\u59cb，\u6682\u505c\u65f6\u53ef\u4ee5\u505c\u5728\u5f53\u524dGOP\u7684\u7ed3\u675f\u3002<\/li>\n

      \u5728\u5b9e\u9645\u5e94\u7528\u4e2d，\u6211\u4eec\u9700\u8981\u6839\u636e\u5b9e\u9645\u9700\u6c42\u548c\u7f51\u7edc\u73af\u5883，\u5408\u7406\u8bbe\u7f6eGOP\u7684\u53c2\u6570，\u4ee5\u5b9e\u73b0\u9ad8\u6548\u3001\u7a33\u5b9a\u7684\u89c6\u9891\u6d41\u4f20\u8f93\u3002<\/p>\n

      6.3 \u63d2\u5165GOP\u56fe\u50cf\u7ec4\u7684\u65b9\u6cd5\u4e0e\u6ce8\u610f\u4e8b\u9879（Methods and Precautions for Inserting GOP）<\/h3>\n

      \u5728\u5b9e\u73b0RTSP\u670d\u52a1\u5668\u7684\u8fc7\u7a0b\u4e2d，GOP（Group of Pictures）\u56fe\u50cf\u7ec4\u7684\u63d2\u5165\u662f\u4e00\u4e2a\u5173\u952e\u6b65\u9aa4\u3002GOP\u662f\u7531\u4e00\u4e2aI\u5e27\u548c\u968f\u540e\u7684P\u5e27\u3001B\u5e27\u7ec4\u6210\u7684\u5e8f\u5217，\u5176\u4e2dI\u5e27\u662f\u5173\u952e\u5e27，P\u5e27\u548cB\u5e27\u662f\u5dee\u5206\u5e27\u3002\u63d2\u5165GOP\u56fe\u50cf\u7ec4\u53ef\u4ee5\u6709\u6548\u5730\u63d0\u9ad8\u89c6\u9891\u7684\u538b\u7f29\u6548\u7387，\u540c\u65f6\u4e5f\u5bf9\u89c6\u9891\u7684\u8d28\u91cf\u548c\u6d41\u7545\u6027\u6709\u91cd\u8981\u5f71\u54cd\u3002<\/p>\n

      \u63d2\u5165GOP\u56fe\u50cf\u7ec4\u7684\u65b9\u6cd5<\/h4>\n

      \u63d2\u5165GOP\u56fe\u50cf\u7ec4\u7684\u4e3b\u8981\u65b9\u6cd5\u662f\u5728\u7f16\u7801\u89c6\u9891\u65f6\u8bbe\u7f6eGOP\u7684\u5927\u5c0f\u548c\u7ed3\u6784\u3002\u5728\u5927\u591a\u6570\u89c6\u9891\u7f16\u7801\u6807\u51c6\u4e2d，\u5982H.264\u548cH.265，\u90fd\u63d0\u4f9b\u4e86\u8bbe\u7f6eGOP\u5927\u5c0f\u7684\u9009\u9879\u3002\u5728\u7f16\u7801\u5668\u4e2d，\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u5173\u952e\u5e27\u95f4\u9694（\u4e5f\u5c31\u662fGOP\u5927\u5c0f）\u6765\u63a7\u5236GOP\u7684\u751f\u6210\u3002\u4f8b\u5982，\u5982\u679c\u8bbe\u7f6e\u5173\u952e\u5e27\u95f4\u9694\u4e3a10，\u90a3\u4e48\u6bcf10\u5e27\u5c31\u4f1a\u751f\u6210\u4e00\u4e2aI\u5e27，\u4ece\u800c\u5f62\u6210\u4e00\u4e2a\u65b0\u7684GOP\u3002<\/p>\n

      \u5728\u8bbe\u7f6eGOP\u5927\u5c0f\u65f6，\u8fd8\u9700\u8981\u8003\u8651\u5230GOP\u7684\u7ed3\u6784，\u4e5f\u5c31\u662fI\u5e27\u3001P\u5e27\u548cB\u5e27\u7684\u6392\u5217\u65b9\u5f0f\u3002\u4e00\u822c\u6765\u8bf4，\u4e00\u4e2aGOP\u5f00\u59cb\u4e8e\u4e00\u4e2aI\u5e27，\u7136\u540e\u662f\u4e00\u7cfb\u5217\u7684P\u5e27\u548cB\u5e27\u3002P\u5e27\u662f\u57fa\u4e8e\u524d\u4e00\u5e27\u8fdb\u884c\u9884\u6d4b\u7684\u5e27，\u800cB\u5e27\u5219\u662f\u57fa\u4e8e\u524d\u540e\u4e24\u5e27\u8fdb\u884c\u9884\u6d4b\u7684\u5e27\u3002\u56e0\u6b64，GOP\u7684\u7ed3\u6784\u4f1a\u5f71\u54cd\u5230\u89c6\u9891\u7684\u538b\u7f29\u6548\u7387\u548c\u8d28\u91cf\u3002<\/p>\n

      \u63d2\u5165GOP\u56fe\u50cf\u7ec4\u7684\u6ce8\u610f\u4e8b\u9879<\/h4>\n

      \u5728\u63d2\u5165GOP\u56fe\u50cf\u7ec4\u65f6，\u6709\u51e0\u70b9\u9700\u8981\u6ce8\u610f：<\/p>\n

    • GOP\u5927\u5c0f\u7684\u9009\u62e9：GOP\u7684\u5927\u5c0f\u4f1a\u5f71\u54cd\u5230\u89c6\u9891\u7684\u538b\u7f29\u6548\u7387\u548c\u8d28\u91cf\u3002\u4e00\u822c\u6765\u8bf4，\u8f83\u5927\u7684GOP\u53ef\u4ee5\u63d0\u9ad8\u538b\u7f29\u6548\u7387，\u4f46\u53ef\u80fd\u4f1a\u964d\u4f4e\u89c6\u9891\u7684\u8d28\u91cf\u3002\u56e0\u6b64，\u9700\u8981\u6839\u636e\u5b9e\u9645\u9700\u6c42\u6765\u9009\u62e9\u5408\u9002\u7684GOP\u5927\u5c0f\u3002<\/li>\n
    • I\u5e27\u3001P\u5e27\u548cB\u5e27\u7684\u987a\u5e8f：\u5728\u63d2\u5165GOP\u65f6，\u9700\u8981\u4fdd\u8bc1I\u5e27\u3001P\u5e27\u548cB\u5e27\u7684\u6b63\u786e\u987a\u5e8f\u3002\u5982\u679c\u987a\u5e8f\u9519\u8bef，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89c6\u9891\u7684\u89e3\u7801\u9519\u8bef，\u4ece\u800c\u5f71\u54cd\u5230\u89c6\u9891\u7684\u8d28\u91cf\u3002<\/li>\n
    • \u7f51\u7edc\u73af\u5883\u7684\u8003\u8651：\u5728\u5b9e\u73b0RTSP\u670d\u52a1\u5668\u65f6，\u8fd8\u9700\u8981\u8003\u8651\u5230\u7f51\u7edc\u73af\u5883\u7684\u5f71\u54cd\u3002\u5982\u679c\u7f51\u7edc\u73af\u5883\u4e0d\u7a33\u5b9a，\u53ef\u80fd\u9700\u8981\u9009\u62e9\u8f83\u5c0f\u7684GOP\u5927\u5c0f，\u4ee5\u51cf\u5c11\u7531\u4e8e\u7f51\u7edc\u4e22\u5305\u5bfc\u81f4\u7684\u89c6\u9891\u8d28\u91cf\u4e0b\u964d\u3002<\/li>\n
    • \u7f16\u7801\u5668\u7684\u8bbe\u7f6e：\u5728\u7f16\u7801\u5668\u4e2d，\u9700\u8981\u6b63\u786e\u8bbe\u7f6eGOP\u7684\u5927\u5c0f<\/li>\n

      \u5bf9\u4e0d\u8d77，\u6211\u5728\u5c1d\u8bd5\u83b7\u53d6\u76f8\u5173\u4fe1\u606f\u65f6\u9047\u5230\u4e86\u4e00\u4e9b\u95ee\u9898\u3002\u4e0d\u8fc7，\u6211\u53ef\u4ee5\u7ee7\u7eed\u63d0\u4f9b\u4e00\u4e9b\u5173\u4e8e\u63d2\u5165GOP\u56fe\u50cf\u7ec4\u7684\u6ce8\u610f\u4e8b\u9879：<\/p>\n

    • \u540c\u6b65\u95ee\u9898：\u5728\u63d2\u5165GOP\u56fe\u50cf\u7ec4\u65f6，\u9700\u8981\u6ce8\u610f\u89c6\u9891\u548c\u97f3\u9891\u7684\u540c\u6b65\u95ee\u9898\u3002\u5982\u679c\u89c6\u9891\u548c\u97f3\u9891\u7684\u65f6\u95f4\u6233\u4e0d\u5339\u914d，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u64ad\u653e\u65f6\u51fa\u73b0\u540c\u6b65\u95ee\u9898\u3002<\/li>\n
    • \u7f16\u7801\u683c\u5f0f\u7684\u9009\u62e9：\u5728\u63d2\u5165GOP\u56fe\u50cf\u7ec4\u65f6，\u8fd8\u9700\u8981\u8003\u8651\u5230\u7f16\u7801\u683c\u5f0f\u7684\u9009\u62e9\u3002\u4e0d\u540c\u7684\u7f16\u7801\u683c\u5f0f，\u5982H.264\u548cH.265，\u5bf9GOP\u7684\u5904\u7406\u65b9\u5f0f\u53ef\u80fd\u4f1a\u6709\u6240\u4e0d\u540c\u3002<\/li>\n
    • \u89c6\u9891\u6e90\u7684\u8d28\u91cf：\u5728\u63d2\u5165GOP\u56fe\u50cf\u7ec4\u65f6，\u8fd8\u9700\u8981\u8003\u8651\u5230\u89c6\u9891\u6e90\u7684\u8d28\u91cf\u3002\u5982\u679c\u89c6\u9891\u6e90\u7684\u8d28\u91cf\u8f83\u4f4e，\u5373\u4f7f\u6b63\u786e\u63d2\u5165\u4e86GOP\u56fe\u50cf\u7ec4，\u4e5f\u53ef\u80fd\u65e0\u6cd5\u63d0\u9ad8\u89c6\u9891\u7684\u8d28\u91cf\u3002<\/li>\n

      \u4ee5\u4e0a\u5c31\u662f\u5173\u4e8e\u63d2\u5165GOP\u56fe\u50cf\u7ec4\u7684\u4e00\u4e9b\u65b9\u6cd5\u548c\u6ce8\u610f\u4e8b\u9879\u3002\u5e0c\u671b\u8fd9\u4e9b\u4fe1\u606f\u80fd\u591f\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\u3002\u5982\u679c\u4f60\u8fd8\u6709\u5176\u4ed6\u95ee\u9898，\u6b22\u8fce\u968f\u65f6\u5411\u6211\u63d0\u95ee\u3002<\/p>\n

      6.4 \u4ee3\u7801\u793a\u4f8b<\/h3>\n

      6.4.1 \u5728RTSP\u670d\u52a1\u5668\u4e2d\u63d2\u5165GOP（Group of Pictures）\u7684C++\u4ee3\u7801\u793a\u4f8b<\/h4>\n

      \u8fd9\u662f\u4e00\u4e2a\u5728RTSP\u670d\u52a1\u5668\u4e2d\u63d2\u5165GOP（Group of Pictures）\u7684C++\u4ee3\u7801\u793a\u4f8b\u3002\u8fd9\u6bb5\u4ee3\u7801\u4e3b\u8981\u662f\u901a\u8fc7\u8c03\u7528insertGOP\u51fd\u6570\u6765\u5b9e\u73b0\u7684\u3002\u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d，\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684GOP\u5bf9\u8c61，\u7136\u540e\u5c06\u5176\u6dfb\u52a0\u5230GOPs\u5217\u8868\u4e2d\u3002\u7136\u540e，\u5bf9\u6bcf\u4e2a\u5728GOP\u4e2d\u7684\u5e27，\u90fd\u8c03\u7528insertFrame\u51fd\u6570\u5c06\u5176\u6dfb\u52a0\u5230GOP\u4e2d\u3002\u6700\u540e，\u5982\u679cGOP\u7684\u5927\u5c0f\u8d85\u8fc7\u4e86\u6700\u5927\u9650\u5236，\u5c31\u4f1a\u5220\u9664\u6700\u65e9\u7684GOP\u3002<\/p>\n

      void RTSPServer::insertGOP(GOP gop) {
      \n \/\/ Create a new GOP
      \n GOP newGOP = GOP();<\/p>\n

      \/\/ Add the new GOP to the list of GOPs
      \n GOPs.push_back(newGOP);<\/p>\n

      \/\/ For each frame in the GOP, insert it into the new GOP
      \n for (Frame frame : gop.getFrames()) {
      \n newGOP.insertFrame(frame);
      \n }<\/p>\n

      \/\/ If the number of GOPs exceeds the maximum limit, remove the oldest GOP
      \n if (GOPs.size() > MAX_GOPs) {
      \n GOPs.pop_front();
      \n }
      \n} <\/p>\n

      \u8bf7\u6ce8\u610f，\u8fd9\u53ea\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b，\u5b9e\u9645\u7684\u5b9e\u73b0\u53ef\u80fd\u4f1a\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\u548c\u73af\u5883\u6709\u6240\u4e0d\u540c\u3002\u4f8b\u5982，\u4f60\u53ef\u80fd\u9700\u8981\u5904\u7406\u9519\u8bef\u60c5\u51b5，\u6216\u8005\u5728\u63d2\u5165\u65b0\u7684GOP\u65f6\u8fdb\u884c\u4e00\u4e9b\u989d\u5916\u7684\u64cd\u4f5c\u3002<\/p>\n

      \u6b64\u5916，\u8fd9\u6bb5\u4ee3\u7801\u5047\u8bbe\u4f60\u5df2\u7ecf\u6709\u4e86\u4e00\u4e2aGOP\u7c7b\u548c\u4e00\u4e2aFrame\u7c7b\u3002GOP\u7c7b\u5e94\u8be5\u6709\u4e00\u4e2agetFrames\u65b9\u6cd5\u6765\u83b7\u53d6GOP\u4e2d\u7684\u6240\u6709\u5e27，\u4ee5\u53ca\u4e00\u4e2ainsertFrame\u65b9\u6cd5\u6765\u6dfb\u52a0\u65b0\u7684\u5e27\u3002Frame\u7c7b\u5219\u4ee3\u8868\u4e86\u89c6\u9891\u6d41\u4e2d\u7684\u4e00\u4e2a\u5e27\u3002<\/p>\n

      \u5728\u5b9e\u9645\u4f7f\u7528\u65f6，\u4f60\u53ef\u80fd\u9700\u8981\u6839\u636e\u4f60\u7684\u89c6\u9891\u6d41\u7684\u7279\u6027\u548c\u4f60\u7684\u670d\u52a1\u5668\u7684\u9700\u6c42\u6765\u8c03\u6574\u8fd9\u6bb5\u4ee3\u7801\u3002\u4f8b\u5982，\u4f60\u53ef\u80fd\u9700\u8981\u8c03\u6574MAX_GOPs\u7684\u503c，\u6216\u8005\u5728\u5220\u9664\u65e7\u7684GOP\u65f6\u8fdb\u884c\u4e00\u4e9b\u989d\u5916\u7684\u64cd\u4f5c\u3002<\/p>\n

      6.4.2 live555\u4ed3\u5e93\u4e2d\u5904\u7406H264\u89c6\u9891RTP sink\u7684\u7279\u6b8a\u5e27 \u4ee3\u7801\u793a\u4f8b<\/h4>\n

      \/\/ File: liveMedia\/H264VideoRTPSink.cpp
      \n\/\/ Repository: https:\/\/github.com\/rgaufert\/live555<\/p>\n

      void H264VideoRTPSink::doSpecialFrameHandling(unsigned fragmentationOffset,
      \n unsigned char* frameStart,
      \n unsigned numBytesInFrame,
      \n struct timeval framePresentationTime,
      \n unsigned numRemainingBytes) {
      \n \/\/ Set the RTP 'M' (marker) bit iff
      \n \/\/ 1\/ The most recently delivered fragment was the end of (or the only fragment of) an NAL unit, and
      \n \/\/ 2\/ This NAL unit was the last NAL unit of an 'access unit' (i.e. video frame).
      \n \/\/ (RTP 'M' bit is set for video frames only; not for audio frames)<\/p>\n

      \/\/ Begin by checking condition 1\/ above:
      \n if (numRemainingBytes == 0) { \/\/ This fragment ends the current NAL unit
      \n \/\/ Check for condition 2\/ above:
      \n \/\/ This requires parsing the NAL unit's header byte, and the first byte of the NAL unit payload:
      \n if (numBytesInFrame > 0) {
      \n unsigned char nal_unit_type = (frameStart[0]&0x1F);
      \n if (nal_unit_type == 24 || nal_unit_type == 25 || nal_unit_type == 26 || nal_unit_type == 27) {
      \n\/\/ This is a STAP-A, STAP-B, MTAP16, or MTAP24 NAL unit. Check the first NAL unit within it:
      \nif (numBytesInFrame > 1) {
      \n nal_unit_type = (frameStart[1]&0x1F);
      \n} else {
      \n \/\/ This NAL unit is unusable; we shouldn't have sent it
      \n nal_unit_type = 0;
      \n}
      \n }<\/p>\n

      if (nal_unit_type == 6 || nal_unit_type == 7 || nal_unit_type == 8) {
      \n\/\/ This NAL unit is an SPS or PPS or a prefix NAL unit; next is a IDR picture
      \nfCurrentNALUnitEndsAccessUnit = True;
      \n } else if (nal_unit_type <= 5 && nal_unit_type > 0) {
      \n\/\/ This NAL unit is a VCL NAL unit (slice_layer_without_partitioning_rbsp)
      \n\/\/ We need to examine the first byte of the NAL unit's RBSP payload – the "slice header":
      \nunsigned char* sliceHeader = &frameStart[1]; \/\/ if the NAL unit is not fragmented
      \nunsigned numBytesInNALUnitPayload = numBytesInFrame – 1;<\/p>\n

      \/\/ Begin by making sure we have at least one byte of the NAL unit payload data:
      \nif (numBytesInNALUnitPayload > 0) {
      \n if (nal_unit_type == 28 || nal_unit_type == 29) {
      \n \/\/ This is a FU-A or FU-B NAL unit. We need to find the start of the NAL unit's payload data:
      \n if (numBytesInFrame > 2) {
      \n sliceHeader = &frameStart[2];
      \n numBytesInNALUnitPayload = numBytesInFrame – 2;
      \n } else {
      \n \/\/ This NAL unit is unusable; we shouldn't have sent it
      \n numBytesInNALUnitPayload = 0;
      \n }
      \n }<\/p>\n

      if (numBytesInNALUnitPayload > 0) {
      \n unsigned char slice_type = sliceHeader[0]&0x1F;
      \n fCurrentNALUnitEndsAccessUnit = False;
      \n if (fLastNALUnitEndsAccessUnit) {
      \n \/\/ This is the start of a new access unit
      \n if (fNextDeliverPresentationTime.tv_sec != 0 || fNextDeliverPresentationTime.tv_usec != 0) {
      \n\/\/ We have a saved 'next presentation time'. Deliver the most recent frame with that presentation time now, before starting the new access unit
      \nif (fNumSavedNALUnits > 0) {
      \n doSpecialFrameHandling1(fNumSavedNALUnits, fSavedNALUnits, fSavedNALUnitSizes, fSavedNALUnitPresentationTimes, fNextDeliverPresentationTime);
      \n delete[] fSavedNALUnits;
      \n delete[] fSavedNALUnitSizes;
      \n delete[] fSavedNALUnitPresentationTimes;
      \n}
      \n }
      \n }
      \n \/\/\u4fdd\u5b58I\u5e27
      \n if (nal_unit_type == 5) {
      \n saveFrameParameters(slice_type, fragmentationOffset, frameStart, numBytesInFrame, framePresentationTime);
      \n }<\/p>\n

      fNextDeliverPresentationTime = framePresentationTime;
      \n fNextDeliverPresentationTime.tv_sec += fMaxPacketAge;<\/p>\n

      fLastNALUnitEndsAccessUnit = fCurrentNALUnitEndsAccessUnit;
      \n }
      \n}
      \n }
      \n }
      \n }
      \n} <\/p>\n

      \u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d，\u6211\u4eec\u53ef\u4ee5\u770b\u5230：<\/p>\n

        \n
      • \u9996\u5148，\u901a\u8fc7\u6309\u4f4d\u4e0e\u64cd\u4f5c\u548c\u63a9\u78010x1F\u83b7\u53d6NAL\u5355\u5143\u7684\u7c7b\u578b\u3002<\/li>\n
      • \u5982\u679cNAL\u5355\u5143\u7c7b\u578b\u662f5（IDR\u56fe\u50cf\u5e27），\u5219\u4fdd\u5b58\u8be5\u5e27\u7684\u53c2\u6570\u3002<\/li>\n
      • \u6700\u540e，\u5c06\u5f53\u524dNAL\u5355\u5143\u7684\u7ed3\u675f\u6807\u5fd7\u8d4b\u503c\u7ed9fLastNALUnitEndsAccessUnit\u53d8\u91cf，\u4ee5\u4fbf\u5728\u4e0b\u4e00\u6b21\u5904\u7406\u7279\u6b8a\u5e27\u65f6\u4f7f\u7528\u3002<\/li>\n<\/ul>\n

        \u8fd9\u6bb5\u4ee3\u7801\u662f\u4ecelive555\u4ed3\u5e93\u4e2d\u7684liveMedia\/H264VideoRTPSink.cpp\u6587\u4ef6\u4e2d\u63d0\u53d6\u7684，\u7528\u4e8e\u5904\u7406H264\u89c6\u9891RTP sink\u7684\u7279\u6b8a\u5e27\u60c5\u51b5\u3002\u5b83\u53ef\u4ee5\u5e2e\u52a9\u60a8\u7406\u89e3\u5982\u4f55\u5728C++\u4e2d\u63d2\u5165GOP，\u5e76\u6839\u636e\u5e27\u7c7b\u578b\u8fdb\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002<\/p>\n

        \u8bf7\u6ce8\u610f，\u8fd9\u53ea\u662f\u4ee3\u7801\u7247\u6bb5\u7684\u4e00\u90e8\u5206，\u5b8c\u6574\u7684\u4ee3\u7801\u903b\u8f91\u53ef\u80fd\u66f4\u590d\u6742\u3002\u8981\u6df1\u5165\u4e86\u89e3\u5982\u4f55\u5728RTSP\u670d\u52a1\u5668\u4e2d\u63d2\u5165GOP，\u8bf7\u53c2\u8003\u76f8\u5173\u7684\u6587\u6863\u3001\u8d44\u6599\u6216\u7814\u7a76live555\u9879\u76ee\u7684\u6e90\u4ee3\u7801\u3002<\/p>\n

        6.4.3 \u5982\u4f55\u5728RTSP\u670d\u52a1\u5668\u4e2d\u5904\u7406\u53d1\u9001\u5e27<\/h4>\n

        \u8fd9\u662f\u4e00\u4e2a\u53ef\u80fd\u4f1a\u6709\u5e2e\u52a9\u7684GitHub\u4ed3\u5e93\u4e2d\u7684\u4ee3\u7801\u7247\u6bb5：<\/p>\n

        \/\/ \u8fd9\u4e2a\u51fd\u6570\u5728\u7279\u5b9a\u7684\u65f6\u95f4\u95f4\u9694\u540e\u88ab\u8c03\u7528
        \nvoid check_for_frame_to_send() {
        \n \/\/ \u68c0\u67e5\u662f\u5426\u6709\u5e27\u9700\u8981\u53d1\u9001
        \n if (!frames.empty()) {
        \n \/\/ \u83b7\u53d6\u7b2c\u4e00\u4e2a\u5e27
        \n auto frame = frames.front();<\/p>\n

        \/\/ \u68c0\u67e5\u8fd9\u4e2a\u5e27\u662f\u5426\u662f\u5173\u952e\u5e27（GOP）
        \n if (frame->key_frame) {
        \n \/\/ \u53d1\u9001\u8fd9\u4e2a\u5e27
        \n send_frame(frame);<\/p>\n

        \/\/ \u4ece\u961f\u5217\u4e2d\u79fb\u9664\u8fd9\u4e2a\u5e27
        \n frames.pop();
        \n }
        \n }
        \n} <\/p>\n

        \u8fd9\u4e2aC++\u4ee3\u7801\u7247\u6bb5\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b，\u5c55\u793a\u4e86\u4f60\u53ef\u80fd\u5982\u4f55\u5728RTSP\u670d\u52a1\u5668\u4e2d\u5904\u7406\u53d1\u9001\u5e27\u3002\u5b83\u68c0\u67e5\u662f\u5426\u6709\u5e27\u9700\u8981\u53d1\u9001，\u5982\u679c\u961f\u5217\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5e27\u662f\u5173\u952e\u5e27（\u6216\u8005GOP），\u90a3\u4e48\u5c31\u53d1\u9001\u8fd9\u4e2a\u5e27，\u7136\u540e\u4ece\u961f\u5217\u4e2d\u79fb\u9664\u5b83\u3002<\/p>\n

        \u8bf7\u6ce8\u610f，\u8fd9\u53ea\u662f\u4e00\u4e2a\u7b80\u5316\u7684\u793a\u4f8b，\u5b9e\u9645\u7684\u5b9e\u73b0\u53ef\u80fd\u4f1a\u6839\u636e\u4f60\u7684\u7279\u5b9a\u9700\u6c42\u548c\u4f60\u4f7f\u7528\u7684\u5e93\u800c\u6709\u6240\u4e0d\u540c\u3002<\/p>\n

        \u5728\u5904\u7406\u89c6\u9891\u6d41\u4e2d\u7684GOP\u65f6，\u8bf7\u8bb0\u4f4f：<\/p>\n

      • GOP\u4ee5\u5173\u952e\u5e27（I\u5e27）\u5f00\u59cb，\u8fd9\u4e2a\u5e27\u53ef\u4ee5\u72ec\u7acb\u4e8e\u5176\u4ed6\u4efb\u4f55\u5e27\u8fdb\u884c\u89e3\u7801\u3002<\/li>\n
      • GOP\u7684\u7ed3\u6784\u548c\u5927\u5c0f\u53ef\u4ee5\u663e\u8457\u5f71\u54cd\u89c6\u9891\u538b\u7f29\u7684\u6548\u7387\u548c\u5728\u89c6\u9891\u4e2d\u5bfb\u627e\u7684\u80fd\u529b\u3002<\/li>\n
      • \u5728\u6d41\u5a92\u4f53\u89c6\u9891\u65f6，\u4f60\u901a\u5e38\u5e0c\u671b\u786e\u4fdd\u4e0d\u540c\u89c6\u9891\u8f68\u9053\u4e2d\u7684\u5173\u952e\u5e27\u662f\u5bf9\u9f50\u7684，\u4ee5\u4fbf\u5728\u8f68\u9053\u4e4b\u95f4\u5e73\u6ed1\u5207\u6362\u3002<\/li>\n

        \u4e03\u3001\u64ad\u653e\u901f\u5ea6\u7684\u63a7\u5236\u4e0e\u500d\u901f\u64ad\u653e\u7684\u5b9e\u73b0（Control of Playback Speed and Implementation of Speed-up Playback）<\/h3>\n

        7.1 \u64ad\u653e\u901f\u5ea6\u7684\u63a7\u5236\u539f\u7406（Principle of Playback Speed Control）<\/h3>\n

        \u5728\u6df1\u5165\u4e86\u89e3\u64ad\u653e\u901f\u5ea6\u63a7\u5236\u7684\u539f\u7406\u4e4b\u524d，\u6211\u4eec\u9996\u5148\u9700\u8981\u7406\u89e3\u89c6\u9891\u64ad\u653e\u7684\u57fa\u672c\u673a\u5236\u3002\u89c6\u9891\u64ad\u653e\u5b9e\u9645\u4e0a\u662f\u4e00\u7cfb\u5217\u9759\u6001\u56fe\u50cf（\u5e27）\u5728\u77ed\u65f6\u95f4\u5185\u8fde\u7eed\u64ad\u653e\u7684\u7ed3\u679c，\u8fd9\u79cd\u8fde\u7eed\u64ad\u653e\u7684\u901f\u5ea6\u88ab\u79f0\u4e3a\u5e27\u7387（Frame Rate），\u5355\u4f4d\u901a\u5e38\u662fFPS（Frames Per Second，\u6bcf\u79d2\u5e27\u6570）\u3002\u5f53\u5e27\u7387\u8db3\u591f\u9ad8\u65f6，\u4eba\u773c\u4f1a\u5c06\u8fd9\u4e9b\u8fde\u7eed\u7684\u5e27\u89c6\u4e3a\u52a8\u6001\u7684\u89c6\u9891\u3002<\/p>\n

        \u5728RTSP（Real Time Streaming Protocol，\u5b9e\u65f6\u6d41\u4f20\u8f93\u534f\u8bae）\u670d\u52a1\u5668\u4e2d，\u64ad\u653e\u901f\u5ea6\u7684\u63a7\u5236\u4e3b\u8981\u901a\u8fc7\u8c03\u6574\u5e27\u7387\u6765\u5b9e\u73b0\u3002\u5177\u4f53\u6765\u8bf4，\u5982\u679c\u6211\u4eec\u5e0c\u671b\u89c6\u9891\u64ad\u653e\u901f\u5ea6\u52a0\u5feb，\u90a3\u4e48\u53ef\u4ee5\u901a\u8fc7\u589e\u52a0\u5e27\u7387\u6765\u5b9e\u73b0；\u76f8\u53cd，\u5982\u679c\u6211\u4eec\u5e0c\u671b\u89c6\u9891\u64ad\u653e\u901f\u5ea6\u51cf\u6162，\u90a3\u4e48\u53ef\u4ee5\u901a\u8fc7\u964d\u4f4e\u5e27\u7387\u6765\u5b9e\u73b0\u3002<\/p>\n

        \u7136\u800c，\u8fd9\u91cc\u6709\u4e00\u4e2a\u95ee\u9898\u9700\u8981\u6ce8\u610f，\u90a3\u5c31\u662f\u5e27\u7387\u7684\u8c03\u6574\u5fc5\u987b\u5728\u4e0d\u5f71\u54cd\u89c6\u9891\u8d28\u91cf\u7684\u524d\u63d0\u4e0b\u8fdb\u884c\u3002\u56e0\u4e3a\u5982\u679c\u5e27\u7387\u8fc7\u9ad8，\u867d\u7136\u53ef\u4ee5\u4f7f\u89c6\u9891\u64ad\u653e\u901f\u5ea6\u52a0\u5feb，\u4f46\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89c6\u9891\u753b\u9762\u7684\u4e22\u5e27\u73b0\u8c61，\u5f71\u54cd\u89c2\u770b\u4f53\u9a8c；\u540c\u6837，\u5982\u679c\u5e27\u7387\u8fc7\u4f4e，\u867d\u7136\u53ef\u4ee5\u4f7f\u89c6\u9891\u64ad\u653e\u901f\u5ea6\u51cf\u6162，\u4f46\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89c6\u9891\u753b\u9762\u7684\u5361\u987f\u73b0\u8c61，\u540c\u6837\u5f71\u54cd\u89c2\u770b\u4f53\u9a8c\u3002<\/p>\n

        \u56e0\u6b64，\u5982\u4f55\u5728\u4fdd\u8bc1\u89c6\u9891\u8d28\u91cf\u7684\u540c\u65f6，\u6709\u6548\u5730\u63a7\u5236\u64ad\u653e\u901f\u5ea6，\u662fRTSP\u670d\u52a1\u5668\u9700\u8981\u89e3\u51b3\u7684\u91cd\u8981\u95ee\u9898\u3002\u5728\u4e0b\u4e00\u8282\u4e2d，\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u901a\u8fc7C++\u548cLive555\u5e93\u6765\u5b9e\u73b0\u8fd9\u4e00\u76ee\u6807\u3002<\/p>\n

        7.2 \u5982\u4f55\u5b9e\u73b0\u500d\u901f\u64ad\u653e（How to Implement Speed-up Playback）<\/h3>\n

        \u500d\u901f\u64ad\u653e\u662f\u73b0\u4ee3\u591a\u5a92\u4f53\u5e94\u7528\u4e2d\u5e38\u89c1\u7684\u529f\u80fd，\u5b83\u5141\u8bb8\u7528\u6237\u5728\u4fdd\u6301\u89c6\u9891\u548c\u97f3\u9891\u540c\u6b65\u7684\u540c\u65f6，\u52a0\u5feb\u6216\u51cf\u6162\u64ad\u653e\u901f\u5ea6\u3002\u5728C++\u548cLive555\u5e93\u4e2d，\u5b9e\u73b0\u500d\u901f\u64ad\u653e\u7684\u5173\u952e\u5728\u4e8e\u6b63\u786e\u5730\u8c03\u6574\u5e27\u7684\u53d1\u9001\u901f\u5ea6\u3002<\/p>\n

        \u9996\u5148，\u6211\u4eec\u9700\u8981\u7406\u89e3\u5728RTSP\u6d41\u4e2d，\u6bcf\u4e00\u5e27\u90fd\u6709\u4e00\u4e2a\u7279\u5b9a\u7684\u65f6\u95f4\u6233（Timestamp）\u3002\u8fd9\u4e2a\u65f6\u95f4\u6233\u51b3\u5b9a\u4e86\u5e27\u5728\u64ad\u653e\u8fc7\u7a0b\u4e2d\u7684\u663e\u793a\u65f6\u95f4\u3002\u5728\u6b63\u5e38\u64ad\u653e\u901f\u5ea6\u4e0b，\u6bcf\u4e00\u5e27\u7684\u663e\u793a\u65f6\u95f4\u4e0e\u5176\u5728\u89c6\u9891\u6587\u4ef6\u4e2d\u7684\u76f8\u5bf9\u4f4d\u7f6e\u662f\u4e00\u81f4\u7684\u3002\u4f8b\u5982，\u5982\u679c\u4e00\u4e2a\u89c6\u9891\u7684\u5e27\u7387\u662f30FPS，\u90a3\u4e48\u7b2c150\u5e27\u7684\u65f6\u95f4\u6233\u5c31\u5e94\u8be5\u662f5\u79d2\u3002<\/p>\n

        \u7136\u800c，\u5728\u500d\u901f\u64ad\u653e\u4e2d，\u6211\u4eec\u9700\u8981\u6539\u53d8\u8fd9\u4e2a\u65f6\u95f4\u6233\u4ee5\u8fbe\u5230\u52a0\u5feb\u6216\u51cf\u6162\u64ad\u653e\u901f\u5ea6\u7684\u76ee\u7684\u3002\u5177\u4f53\u6765\u8bf4，\u5982\u679c\u6211\u4eec\u5e0c\u671b\u5b9e\u73b02\u500d\u901f\u64ad\u653e，\u90a3\u4e48\u6211\u4eec\u5c31\u9700\u8981\u5c06\u6bcf\u4e00\u5e27\u7684\u65f6\u95f4\u6233\u51cf\u534a；\u76f8\u53cd，\u5982\u679c\u6211\u4eec\u5e0c\u671b\u5b9e\u73b00.5\u500d\u901f\u64ad\u653e，\u90a3\u4e48\u6211\u4eec\u5c31\u9700\u8981\u5c06\u6bcf\u4e00\u5e27\u7684\u65f6\u95f4\u6233\u7ffb\u500d\u3002<\/p>\n

        \u5728C++\u548cLive555\u5e93\u4e2d，\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539RTP（Real-time Transport Protocol，\u5b9e\u65f6\u4f20\u8f93\u534f\u8bae）\u5305\u7684\u65f6\u95f4\u6233\u6765\u5b9e\u73b0\u8fd9\u4e00\u76ee\u6807\u3002\u5177\u4f53\u7684\u4ee3\u7801\u5b9e\u73b0\u53ef\u80fd\u4f1a\u6d89\u53ca\u5230\u4e00\u4e9b\u590d\u6742\u7684\u7ec6\u8282，\u4f8b\u5982\u5982\u4f55\u5904\u7406\u5e27\u7684\u4f9d\u8d56\u5173\u7cfb（\u4f8b\u5982I\u5e27\u548cP\u5e27），\u5982\u4f55\u786e\u4fdd\u97f3\u89c6\u9891\u540c\u6b65\u7b49\u3002\u4f46\u603b\u7684\u6765\u8bf4，\u53ea\u8981\u6211\u4eec\u6b63\u786e\u5730\u8c03\u6574\u4e86\u5e27\u7684\u65f6\u95f4\u6233，\u5c31\u53ef\u4ee5\u5b9e\u73b0\u500d\u901f\u64ad\u653e\u7684\u529f\u80fd\u3002<\/p>\n

        \/\/ \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2aRTP\u5305\u5bf9\u8c61rtpPacket
        \nRTPPacket rtpPacket;<\/p>\n

        \/\/ \u83b7\u53d6\u5f53\u524d\u7684\u65f6\u95f4\u6233
        \nuint32_t currentTimestamp = rtpPacket.getTimestamp();<\/p>\n

        \/\/ \u5047\u8bbe\u6211\u4eec\u5e0c\u671b\u5b9e\u73b02\u500d\u901f\u64ad\u653e，\u90a3\u4e48\u6211\u4eec\u9700\u8981\u5c06\u65f6\u95f4\u6233\u51cf\u534a
        \nuint32_t newTimestamp = currentTimestamp \/ 2;<\/p>\n

        \/\/ \u8bbe\u7f6e\u65b0\u7684\u65f6\u95f4\u6233
        \nrtpPacket.setTimestamp(newTimestamp); <\/p>\n

        \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d，\u6211\u4eec\u9996\u5148\u83b7\u53d6\u4e86RTP\u5305\u7684\u5f53\u524d\u65f6\u95f4\u6233，\u7136\u540e\u5c06\u5176\u51cf\u534a，\u6700\u540e\u8bbe\u7f6e\u4e86\u65b0\u7684\u65f6\u95f4\u6233\u3002\u8fd9\u6837，\u5f53\u8fd9\u4e2aRTP\u5305\u88ab\u53d1\u9001\u51fa\u53bb\u65f6，\u5b83\u5c31\u4f1a\u5728\u64ad\u653e\u65f6\u88ab\u5feb\u901f\u5730\u663e\u793a\u51fa\u6765，\u4ece\u800c\u5b9e\u73b02\u500d\u901f\u64ad\u653e\u7684\u6548\u679c\u3002<\/p>\n

        \u8bf7\u6ce8\u610f，\u8fd9\u53ea\u662f\u4e00\u4e2a\u975e\u5e38\u57fa\u7840\u7684\u793a\u4f8b，\u5b9e\u9645\u7684\u5b9e\u73b0\u53ef\u80fd\u4f1a\u6d89\u53ca\u5230\u66f4\u591a\u7684\u7ec6\u8282，\u4f8b\u5982\u5982\u4f55\u5904\u7406\u5e27\u7684\u4f9d\u8d56\u5173\u7cfb，\u5982\u4f55\u786e\u4fdd\u97f3\u89c6\u9891\u540c\u6b65\u7b49\u3002\u4f60\u53ef\u80fd\u9700\u8981\u6839\u636e\u4f60\u7684\u5177\u4f53\u9700\u6c42\u548c\u73af\u5883\u6765\u8c03\u6574\u8fd9\u4e2a\u793a\u4f8b\u3002<\/p>\n

        7.3 \u500d\u901f\u64ad\u653e\u7684\u5e94\u7528\u4e0e\u4f18\u5316（Application and Optimization of Speed-up Playback）<\/h3>\n

        \u500d\u901f\u64ad\u653e\u7684\u5e94\u7528\u573a\u666f\u975e\u5e38\u5e7f\u6cdb，\u4f8b\u5982\u5728\u6559\u80b2\u9886\u57df，\u5b66\u751f\u53ef\u4ee5\u901a\u8fc7\u500d\u901f\u64ad\u653e\u6765\u5feb\u901f\u6d4f\u89c8\u8bfe\u7a0b\u5185\u5bb9；\u5728\u5a31\u4e50\u9886\u57df，\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u500d\u901f\u64ad\u653e\u6765\u8282\u7701\u89c2\u770b\u89c6\u9891\u7684\u65f6\u95f4\u3002\u7136\u800c，\u5c3d\u7ba1\u500d\u901f\u64ad\u653e\u770b\u4f3c\u7b80\u5355，\u4f46\u5728\u5b9e\u9645\u5e94\u7528\u4e2d，\u6211\u4eec\u8fd8\u9700\u8981\u8003\u8651\u5f88\u591a\u4f18\u5316\u7b56\u7565\u3002<\/p>\n

        \u9996\u5148，\u6211\u4eec\u9700\u8981\u8003\u8651\u97f3\u9891\u7684\u5904\u7406\u3002\u5728\u89c6\u9891\u64ad\u653e\u4e2d，\u97f3\u9891\u548c\u89c6\u9891\u662f\u9700\u8981\u540c\u6b65\u7684\u3002\u5f53\u6211\u4eec\u6539\u53d8\u89c6\u9891\u7684\u64ad\u653e\u901f\u5ea6\u65f6，\u97f3\u9891\u7684\u64ad\u653e\u901f\u5ea6\u4e5f\u9700\u8981\u76f8\u5e94\u5730\u6539\u53d8\u3002\u7136\u800c，\u76f4\u63a5\u6539\u53d8\u97f3\u9891\u7684\u64ad\u653e\u901f\u5ea6\u53ef\u80fd\u4f1a\u5bfc\u81f4\u97f3\u9891\u7684\u53d8\u8c03，\u5f71\u54cd\u7528\u6237\u7684\u542c\u89c9\u4f53\u9a8c\u3002\u56e0\u6b64，\u6211\u4eec\u9700\u8981\u91c7\u7528\u4e00\u4e9b\u6280\u672f，\u4f8b\u5982\u65f6\u57df\u97f3\u9ad8\u7f29\u653e（Time-Domain Pitch Scaling，TDPS）\u6216\u9891\u57df\u97f3\u9ad8\u7f29\u653e（Frequency-Domain Pitch Scaling，FDPS）\u6765\u4fdd\u6301\u97f3\u9891\u7684\u97f3\u9ad8\u4e0d\u53d8\u3002<\/p>\n

        \u5176\u6b21，\u6211\u4eec\u9700\u8981\u8003\u8651\u5e27\u7387\u7684\u95ee\u9898\u3002\u5728\u500d\u901f\u64ad\u653e\u4e2d，\u5982\u679c\u6211\u4eec\u7b80\u5355\u5730\u589e\u52a0\u5e27\u7387，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89c6\u9891\u7684\u4e22\u5e27，\u5f71\u54cd\u89c6\u9891\u7684\u6d41\u7545\u5ea6\u3002\u56e0\u6b64，\u6211\u4eec\u9700\u8981\u91c7\u7528\u4e00\u4e9b\u6280\u672f，\u4f8b\u5982\u5e27\u63d2\u503c（Frame Interpolation）\u6765\u751f\u6210\u4e2d\u95f4\u5e27，\u4fdd\u6301\u89c6\u9891\u7684\u6d41\u7545\u5ea6\u3002<\/p>\n

        \u6700\u540e，\u6211\u4eec\u9700\u8981\u8003\u8651\u7528\u6237\u4f53\u9a8c\u3002\u5728\u5b9e\u73b0\u500d\u901f\u64ad\u653e\u7684\u529f\u80fd\u65f6，\u6211\u4eec\u9700\u8981\u63d0\u4f9b\u4e00\u4e2a\u7b80\u5355\u6613\u7528\u7684\u7528\u6237\u754c\u9762，\u8ba9\u7528\u6237\u53ef\u4ee5\u65b9\u4fbf\u5730\u8c03\u6574\u64ad\u653e\u901f\u5ea6\u3002\u6b64\u5916，\u6211\u4eec\u8fd8\u9700\u8981\u63d0\u4f9b\u4e00\u4e9b\u989d\u5916\u7684\u529f\u80fd，\u4f8b\u5982\u5feb\u8fdb\u3001\u5feb\u9000\u3001\u6682\u505c\u7b49，\u4ee5\u6ee1\u8db3\u7528\u6237\u7684\u4e0d\u540c\u9700\u6c42\u3002<\/p>\n

        \u603b\u7684\u6765\u8bf4，\u5b9e\u73b0\u4e00\u4e2a\u4f18\u79c0\u7684\u500d\u901f\u64ad\u653e\u529f\u80fd，\u9700\u8981\u6211\u4eec\u4ece\u591a\u4e2a\u89d2\u5ea6\u8fdb\u884c\u8003\u8651\u548c\u4f18\u5316\u3002\u53ea\u6709\u8fd9\u6837，\u6211\u4eec\u624d\u80fd\u63d0\u4f9b\u4e00\u4e2a\u65e2\u529f\u80fd\u5f3a\u5927，\u53c8\u6613\u4e8e\u4f7f\u7528\u7684RTSP\u670d\u52a1\u5668\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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