{"id":452,"date":"2022-02-19T12:24:01","date_gmt":"2022-02-19T04:24:01","guid":{"rendered":"https:\/\/www.fanyamin.com\/wordpress\/?p=452"},"modified":"2022-02-21T21:21:04","modified_gmt":"2022-02-21T13:21:04","slug":"webrtc-%e4%b9%8b%e6%8b%a5%e5%a1%9e%e6%8e%a7%e5%88%b6-%e7%90%86%e8%ae%ba%e7%af%87","status":"publish","type":"post","link":"https:\/\/www.fanyamin.com\/wordpress\/?p=452","title":{"rendered":"\u62e5\u585e\u63a7\u5236\u6280\u672f\u7b14\u8bb0\u4e00\uff1a\u7406\u8bba\u7bc7"},"content":{"rendered":"<table>\n<thead>\n<tr>\n<th><strong>Abstract<\/strong><\/th>\n<th>\u62e5\u585e\u63a7\u5236\u6280\u672f\u7684\u7b14\u8bb0\u4e00<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Authors<\/strong><\/td>\n<td><a href=\"https:\/\/www.fanyamin.com\">Walter Fan<\/a><\/td>\n<\/tr>\n<tr>\n<td>\u00a0<strong>Category<\/strong>\u00a0\u00a0\u00a0<\/td>\n<td>\u00a0learning\u00a0notes\u00a0\u00a0<\/td>\n<\/tr>\n<tr>\n<td><strong>Status<\/strong><\/td>\n<td>WIP<\/td>\n<\/tr>\n<tr>\n<td><strong>Updated<\/strong><\/td>\n<td>2022-2-10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h1>\u5f15\u8a00<\/h1>\n<p>\u5982\u679c\u5e26\u5bbd\u8db3\u591f\u7684\u8bdd, \u6ca1\u6709\u62e5\u585e,\u6ca1\u6709\u5927\u7684\u5ef6\u8fdf\u548c\u6296\u52a8, \u90a3\u4e48\u8bed\u97f3\u548c\u89c6\u9891\u7684\u53d1\u9001\u548c\u63a5\u6536\u90fd\u4f1a\u5f88\u987a\u6ed1,\u4e00\u5207\u4f1a\u5f88\u7f8e\u597d.<\/p>\n<p>\u73b0\u5b9e\u603b\u662f\u5f88\u6b8b\u9177\u7684, \u7f51\u7edc\u4f1a\u65ad, \u4f1a\u4e22\u5305, \u4f1a\u53d8\u6162\uff0c\u5728\u8def\u7531\u8282\u70b9\u4e0a\u4f1a\u6392\u961f\uff0c\u4f1a\u62e5\u585e\uff0c\u5c31\u8c61\u57ce\u5e02\u7684\u73af\u7ebf\u9053\u8def\uff0c\u5e73\u5e38\u8f66\u6765\u8f66\u5f80\uff0c\u9053\u8def\u901a\u7545\uff0c\u4e00\u5230\u4e0a\u4e0b\u73ed\u7684\u65f6\u5019\uff0c\u5927\u5927\u5c0f\u5c0f\u7684\u8f66\u8f86\u5c31\u8c61\u4e4c\u9f9f\u4e00\u6837\u6162\u6162\u5411\u524d\u722c\u3002<\/p>\n<p>\u89c6\u9891\u4f1a\u8bae\u9700\u8981\u4f4e\u5ef6\u8fdf\u548c\u9ad8\u5e26\u5bbd\uff0c\u53ef\u662f\u5b9e\u9645\u60c5\u51b5\u4e2d\uff0c\u9ad8\u5e26\u5bbd\u662f\u96be\u4ee5\u4fdd\u8bc1\u7684\uff0c\u4e00\u65e6\u7f51\u7edc\u51fa\u73b0\u62e5\u585e\uff0c\u539f\u672c\u5c31\u4e0d\u5bbd\u9614\u7684\u201c\u9a6c\u8def\u201d \u5835\u5f97\u66f4\u7a84\uff0c\u5ef6\u8fdf\u66f4\u5927\u3002\u8fd9\u65f6\u5019\uff0c\u5c31\u9700\u8981\u505a\u62e5\u585e\u63a7\u5236<\/p>\n<p>\u5728\u7f51\u7edc\u4f1a\u8bae\u4e2d\uff0c\u5982\u679c\u5ef6\u8fdf\u592a\u5927\uff0c\u5bf9\u5728\u7ebf\u4ea4\u6d41\u5c31\u4f1a\u4ea7\u751f\u5f71\u54cd\u3002\u8bed\u97f3\u4f1a\u611f\u89c9\u5f88\u660e\u663e\uff0c\u89c6\u9891\u76f8\u5bf9\u8fdf\u949d\u4e00\u4e9b\u3002<\/p>\n<p>\u4ee5\u89c6\u9891\u6765\u8bf4\uff0c\u636e\u7814\u7a76\uff0c\u5927\u81f4\u7684\u5173\u7cfb\u5982\u4e0b<\/p>\n<table>\n<thead>\n<tr>\n<th>\u5ef6\u8fdf<\/th>\n<th>\u611f\u89c9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0 ~ 400 \u6beb\u79d2<\/td>\n<td>\u5728\u4ea4\u6d41\u8fc7\u7a0b\u4e2d\u611f\u89c9\u4e0d\u5230\u5ef6\u8fdf<\/td>\n<\/tr>\n<tr>\n<td>400 ~ 800 \u6beb\u79d2<\/td>\n<td>\u80fd\u611f\u89c9\u5230\u5ef6\u8fdf\uff0c\u4f46\u4e0d\u5f71\u54cd\u6c9f\u901a\u548c\u4ea4\u6d41<\/td>\n<\/tr>\n<tr>\n<td>800 \u6beb\u79d2\u53ca\u4ee5\u4e0a<\/td>\n<td>\u80fd\u611f\u89c9\u5230\u5ef6\u8fdf\uff0c\u5e76\u4e14\u5f71\u54cd\u6c9f\u901a\u548c\u4ea4\u6d41<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4ee5\u4e00\u4e2a\u6bcf\u79d2 24 \u5e27 640*480 \u5206\u8fa8\u7387\uff0c\u4ee5 H.264 \u7f16\u7801\u7684\u89c6\u9891\u6d41\uff0c\u89c6\u9891\u7684\u6bd4\u7279\u7387\u548c\u7528\u6237\u611f\u89c9\u7684\u5173\u7cfb\u5982\u4e0b<\/p>\n<table>\n<thead>\n<tr>\n<th>\u6bd4\u7279\u7387<\/th>\n<th>\u611f\u89c9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>&gt; 800kbps<\/td>\n<td>\u7528\u6237\u5bf9\u89c6\u9891\u7684\u6e05\u6670\u5ea6\u611f\u5230\u6ee1\u610f\uff0c\u611f\u77e5\u4e0d\u5230\u89c6\u9891\u56fe\u50cf\u4fe1\u606f\u7684\u4e22\u5931<\/td>\n<\/tr>\n<tr>\n<td>480 ~ 800kbps<\/td>\n<td>\u7528\u6237\u5bf9\u89c6\u9891\u7684\u6e05\u6670\u5ea6\u57fa\u672c\u6ee1\u610f\uff0c\u6709\u4e9b\u4eba\u80fd\u611f\u77e5\u5230\u89c6\u9891\u56fe\u50cf\u4fe1\u606f\u7684\u4e22\u5931<\/td>\n<\/tr>\n<tr>\n<td>&lt; 480kbps<\/td>\n<td>\u7528\u6237\u5bf9\u89c6\u9891\u7684\u6e05\u6670\u5ea6\u5f88\u4e0d\u6ee1\u610f\uff0c\u5927\u591a\u6570\u65f6\u5019\u96be\u4ee5\u5206\u8fa8\u51fa\u56fe\u50cf\u7684\u7ec6\u8282<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h1>\u76f8\u5173\u6587\u6863<\/h1>\n<p>\u6807\u51c6\u5316\u7ec4\u7ec7\u6709\u4e24\u4e2a\u5de5\u4f5c\u7ec4\u5728\u4ece\u4e8b\u62e5\u585e\u63a7\u5236\u76f8\u5173\u7684\u7814\u7a76\u548c\u6807\u51c6\u5236\u8ba2<\/p>\n<p>\u4e00\u4e2a\u662f <a href=\"https:\/\/datatracker.ietf.org\/wg\/rmcat\/about\/\">rmcat<\/a> \u5de5\u4f5c\u7ec4\uff0c\u5168\u79f0\u662f RTP Media Congestion Avoidance Techniques \u5b9e\u65f6\u901a\u4fe1\u5a92\u4f53\u62e5\u585e\u907f\u514d\u6280\u672f\u5de5\u4f5c\u7ec4<\/p>\n<p>\u4e00\u4e2a\u662f <a href=\"https:\/\/datatracker.ietf.org\/wg\/avtcore\/about\/\">acvcore<\/a> \u5de5\u4f5c\u7ec4\uff0c\u5168\u79f0\u662f Audio\/Video Transport Core Maintenance (avtcore) \u97f3\u89c6\u9891\u4f20\u8f93\u6838\u5fc3\u7ef4\u62a4\u5de5\u4f5c\u7ec4<\/p>\n<p>rmcat \u5de5\u4f5c\u7ec4\u4e13\u6ce8\u4e8e\u62e5\u585e\u907f\u514d\u6280\u672f\uff0c\u53d1\u5e03\u4e86\u82e5\u5e72\u4e86\u62e5\u585e\u907f\u514d\u6280\u672f\u548c\u6d4b\u8bd5\u65b9\u6cd5\u76f8\u5173\u7684\u6587\u6863<\/p>\n<ul>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/draft-ietf-rmcat-rtp-cc-feedback\/\">draft-ietf-rmcat-rtp-cc-feedback-08<\/a><br \/>\n<strong>Sending RTP Control Protocol (RTCP) Feedback for Congestion Control in Interactive Multimedia Conferences<\/strong><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8298\/\">RFC 8298<\/a>\u00a0<em>(was draft-ietf-rmcat-scream-cc)<\/em><br \/>\n<strong>Self-Clocked Rate Adaptation for Multimedia<\/strong><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8382\/\">RFC 8382<\/a>\u00a0<em>(was draft-ietf-rmcat-sbd)<\/em><br \/>\n<strong>Shared Bottleneck Detection for Coupled Congestion Control for RTP Media<\/strong><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8593\/\">RFC 8593<\/a>\u00a0<em>(was draft-ietf-rmcat-video-traffic-model)<\/em><br \/>\n<strong>Video Traffic Models for RTP Congestion Control Evaluations<\/strong><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8698\/\">RFC 8698<\/a>\u00a0<em>(was draft-ietf-rmcat-nada)<\/em><br \/>\n<strong>Network-Assisted Dynamic Adaptation (NADA): A Unified Congestion Control Scheme for Real-Time Media<\/strong><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8699\/\">RFC 8699<\/a>\u00a0<em>(was draft-ietf-rmcat-coupled-cc)<\/em><br \/>\n<strong>Coupled Congestion Control for RTP Media<\/strong><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8836\/\">RFC 8836<\/a>\u00a0<em>(was draft-ietf-rmcat-cc-requirements)<\/em><br \/>\n<strong>Congestion Control Requirements for Interactive Real-Time Media<\/strong><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8867\/\">RFC 8867<\/a>\u00a0<em>(was draft-ietf-rmcat-eval-test)<\/em><br \/>\n<strong>Test Cases for Evaluating Congestion Control for Interactive Real-Time Media<\/strong><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8868\/\">RFC 8868<\/a>\u00a0<em>(was draft-ietf-rmcat-eval-criteria)<\/em><br \/>\n<strong>Evaluating Congestion Control for Interactive Real-Time Media<\/strong><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8869\/\">RFC 8869<\/a>\u00a0<em>(was draft-ietf-rmcat-wireless-tests)<\/em><br \/>\n<strong>Evaluation Test Cases for Interactive Real-Time Media over Wireless Networks<\/strong><\/p>\n<\/li>\n<\/ul>\n<p>acvcore \u5de5\u4f5c\u7ec4\u4e13\u6ce8\u4e8e\u97f3\u89c6\u9891\u7684\u4f20\u8f93\uff0c\u4e5f\u53d1\u5e03\u4e86\u51e0\u4e2a\u62e5\u585e\u63a7\u5236\u76f8\u5173\u7684\u6587\u6863<\/p>\n<ul>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc6679\/\">RFC 6679<\/a>\u00a0<em>(was draft-ietf-avtcore-ecn-for-rtp)<\/em><br \/>\n<strong>Explicit Congestion Notification (ECN) for RTP over UDP<\/strong><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8083\/\">RFC 8083<\/a>\u00a0<em>(was draft-ietf-avtcore-rtp-circuit-breakers)<\/em><br \/>\n<strong>Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions<\/strong><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8888\/\">RFC 8888<\/a>\u00a0<em>(was draft-ietf-avtcore-cc-feedback-message)<\/em><br \/>\n<strong>RTP Control Protocol (RTCP) Feedback for Congestion Control<\/strong><\/p>\n<\/li>\n<\/ul>\n<p>\u8fd8\u6709\u53e6\u5916\u4e00\u4e9b\u6587\u6863\u4e5f\u63d0\u53ca\u4e86\u62e5\u585e\u63a7\u5236\u76f8\u5173\u7684\u6280\u672f<\/p>\n<ul>\n<li><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc2914\/\">rfc2914<\/a>\u00a0<strong>Congestion Control Principles<\/strong><\/li>\n<li><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8085\/\">rfc8085<\/a>\u00a0<strong>UDP Usage Guidelines<\/strong><\/li>\n<li><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8834\/\">rfc8834<\/a>\u00a0<strong>Media Transport and Use of RTP in WebRTC<\/strong><\/li>\n<li><a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc5348\/\">rfc5348<\/a>\u00a0<strong>TCP Friendly Rate Control (TFRC): Protocol Specification<\/strong><\/li>\n<\/ul>\n<h2>\u76f8\u5173\u672f\u8bed<\/h2>\n<ul>\n<li>\n<p>RMCAT: RTP Media Congestion Avoidance Techniques \u5373 RTP \u5a92\u4f53\u62e5\u585e\u907f\u514d\u6280\u672f<\/p>\n<\/li>\n<li>\n<p>Queuing Delay \u6392\u961f\u5ef6\u8fdf<\/p>\n<\/li>\n<li>\n<p>Delay gradient \u5ef6\u8fdf\u68af\u5ea6<\/p>\n<\/li>\n<li>\n<p>Kalman filter \u5361\u5c14\u66fc\u6ee4\u6ce2<\/p>\n<\/li>\n<li>\n<p>inter-depature delta time \u53d1\u9001\u95f4\u9694\u65f6\u5dee<\/p>\n<\/li>\n<li>\n<p>inter-arrival delta time \u63a5\u6536\u95f4\u9694\u65f6\u5dee<\/p>\n<\/li>\n<li>\n<p>inter-group delay variation \u5305\u95f4\u5ef6\u8fdf\u53d8\u5316<\/p>\n<\/li>\n<li>\n<p>GCC: Google Congestion control \u8c37\u6b4c\u62e5\u585e\u63a7\u5236<\/p>\n<\/li>\n<li>\n<p>BBR: Bottleneck Bandwidth and Round-trip propagation time \u74f6\u9888\u5e26\u5bbd\u548c\u5f80\u8fd4\u4f20\u64ad\u65f6\u95f4<\/p>\n<\/li>\n<li>\n<p>PCC: Performance-oriented Congestion Control \u57fa\u4e8e\u6027\u80fd\u7684\u62e5\u585e\u63a7\u5236<\/p>\n<\/li>\n<li>\n<p>TCC: Transport-wide Congestion Control \u4f20\u8f93\u5e26\u5bbd\u63a7\u5236<\/p>\n<\/li>\n<li>\n<p>REMB: Receiver Estimated Maximum Bitrate \u63a5\u6536\u7aef\u4f30\u8ba1\u6700\u5927\u6bd4\u7279\u7387<\/p>\n<\/li>\n<li>\n<p>ECN: Explicit Congestion Notification (ECN) \u663e\u5f0f\u7684\u62e5\u585e\u901a\u77e5<\/p>\n<\/li>\n<li>\n<p>Starvation: \u9965\u997f\uff0c\u5982\u679c\u67d0\u4e2a\u4f20\u8f93\u901a\u9053\u7531\u4e8e\u5176\u4ed6\u4f20\u8f93\u901a\u9053\u62a2\u5360\u4e86\u5e26\u5bbd\u800c\u6ca1\u6709\u5f97\u5230\u6d41\u91cf\uff0c\u79f0\u4e3a\u9965\u997f<\/p>\n<\/li>\n<li>\n<p>TMMBR: Temporary Maximum Media Stream Bit Rate Request \u4e34\u65f6\u6700\u5927\u5a92\u4f53\u6d41\u5e26\u5bbd\u8bf7\u6c42<\/p>\n<\/li>\n<li>\n<p>TMMBN: Temporary Maximum Media Stream Bit Rate Notification \u4e34\u65f6\u6700\u5927\u5a92\u4f53\u6d41\u5e26\u5bbd\u901a\u77e5\uff0c \u8868\u793a TMMBR \u6536\u5230<\/p>\n<\/li>\n<li>\n<p>QP: Quantization Parameter, that ranges from 0 to 51. \u91cf\u5316\u53c2\u6570 QP \u8d8a\u5c0f\uff0c\u7ec6\u8282\u4fdd\u7559\u5f97\u8d8a\u591a\uff0c\u8d28\u91cf\u5c31\u66f4\u597d\uff0c \u53cd\u4e4b\u8d28\u91cf\u8d8a\u5dee\uff0c\u538b\u7f29\u7387\u66f4\u9ad8<\/p>\n<\/li>\n<\/ul>\n<h1>\u6280\u672f\u5b9e\u8df5<\/h1>\n<p>\u5de5\u4e1a\u754c\u7684\u6280\u672f\u5b9e\u8df5\u5e38\u5e38\u9886\u5148\u6807\u51c6\u6587\u6863\u4e00\u6b65\uff0c\u5b9e\u8df5\u5f62\u6210\u7406\u8bba\uff0c\u7406\u8bba\u6307\u5bfc\u5b9e\u8df5\uff0c\u5b9e\u8df5\u518d\u53cd\u8fc7\u6765\u5f71\u54cd\u548c\u9a8c\u8bc1\u7406\u8bba\uff0c\u4ece\u6765\u90fd\u662f\u8fd9\u6837\u4e00\u4e2a\u87ba\u65cb\u4e0a\u5347\u7684\u5faa\u73af\u3002<\/p>\n<p>\u5df2\u6709\u4e09\u79cd\u4e3b\u8981\u7684\u62e5\u585e\u907f\u514d\u7b97\u6cd5\u63d0\u51fa\u6765\uff0c \u8be6\u89c1\u4e0b\u8868<\/p>\n<table>\n<thead>\n<tr>\n<th>Feature<\/th>\n<th>GCC<\/th>\n<th>NADA<\/th>\n<th>SCReAM<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Metrics<\/td>\n<td>One-way delay variation,loss ratio<\/td>\n<td>One-way delay, loss ratio<\/td>\n<td>One-way delay, loss ratio<\/td>\n<\/tr>\n<tr>\n<td>Architecture<\/td>\n<td>Sender-side or hybrid<\/td>\n<td>Sender-side<\/td>\n<td>Sender-side<\/td>\n<\/tr>\n<tr>\n<td>Actuation mechanism<\/td>\n<td>Rate-based<\/td>\n<td>Rate-based<\/td>\n<td>Window-based<\/td>\n<\/tr>\n<tr>\n<td>Network support<\/td>\n<td>None<\/td>\n<td>ECN, PCN<\/td>\n<td>ECN<\/td>\n<\/tr>\n<tr>\n<td>Implementation status<\/td>\n<td>Chrome\/Edge, Firefox, Safari<\/td>\n<td>Ns-2 and Ns-3 simulators<\/td>\n<td>OpenWebRTC and simulator<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>1. GCC by Google<\/p>\n<p>Google Congestion Control (GCC) \u88ab\u5e94\u7528\u4e8e Chrome \u6d4f\u89c8\u5668\uff0c\u662f\u76f8\u5bf9\u6bd4\u8f83\u6210\u719f\u7684\u7b97\u6cd5.<\/p>\n<p>2. NADA by Cisco<\/p>\n<p>Network Assisted Dynamic Adaptation(NADA) \u7531\u601d\u79d1\u63d0\u51fa\uff0c\u8fd8\u672a\u5e94\u7528\u4e8e\u5b9e\u9645\u4ea7\u54c1\u4e2d\uff0c\u6709\u76f8\u5173\u7684\u6a21\u62df\u5668\u5b9e\u73b0<\/p>\n<p>3. SCReAM by Ericsson<\/p>\n<p>Self-Clocked Rate Adaptation for Multimedia(SCReAM) \u7531\u7231\u7acb\u4fe1\u63d0\u51fa\uff0c\u5e94\u7528\u4e8e OpenWebRTC\uff0c\u6709\u76f8\u5173\u7684\u6a21\u62df\u5668\u5b9e\u73b0<\/p>\n<h1>\u7b97\u6cd5\u8bbe\u8ba1<\/h1>\n<h2>\u76ee\u6807<\/h2>\n<p>\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u7684\u76ee\u6807\u662f\u4ea7\u751f\u5c3d\u53ef\u80fd\u63a5\u8fd1\u53ef\u7528\u7684\u7aef\u5230\u7aef\u5e26\u5bbd\u7684\u53d1\u9001\u901f\u7387\uff0c\u540c\u65f6\u4fdd\u6301\u961f\u5217\u5360\u7528\u5c3d\u53ef\u80fd\u4f4e\u3002<\/p>\n<p>\u6b64\u5916\uff0cWebRTC \u5e94\u7528\u7a0b\u5e8f\u751f\u6210\u7684\u5a92\u4f53\u6d41\u5e94\u8be5\u4e0e\u5176\u4ed6\u5e76\u53d1\u6d41\u516c\u5e73\u5730\u5171\u4eab\u7f51\u7edc\u5e26\u5bbd\u3002<\/p>\n<p>\u57fa\u672c\u8981\u6c42\uff1a\u5728\u6700\u591a\u51e0\u767e\u6beb\u79d2\u4e4b\u5185\uff0c\u63a5\u6536\u65b9\u80fd\u591f\u8fde\u8d2f\u6d41\u7545\u5730\u542c\u5230\u6216\u770b\u5230\u53d1\u9001\u65b9\u7684\u58f0\u97f3\uff0c\u56fe\u50cf\u6216\u89c6\u9891\u3002<\/p>\n<p>\u5177\u4f53\u8981\u6c42, \u53c2\u89c1 <a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc8836\">RFC8836<\/a><\/p>\n<ol>\n<li>\n<p>\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u5fc5\u987b\u5c1d\u8bd5\u4e3a\u4ea4\u4e92\u5f0f\u5b9e\u65f6\u6d41\u91cf\u63d0\u4f9b\u5c3d\u53ef\u80fd\u4f4e\u7684\u5ef6\u8fdf\u4f20\u8f93\uff0c\u540c\u65f6\u4ecd\u7136\u63d0\u4f9b\u6709\u7528\u7684\u5e26\u5bbd\u91cf\u3002<\/p>\n<\/li>\n<li>\n<p>\u8be5\u7b97\u6cd5\u5fc5\u987b\u5bf9\u5176\u4ed6\u6d41\u516c\u5e73\uff0c\u5305\u62ec\u5b9e\u65f6\u6d41\uff08\u4f8b\u5982\u81ea\u8eab\u7684\u5176\u4ed6\u5b9e\u4f8b\uff09\u548c TCP \u6d41\uff0c\u5305\u62ec\u957f\u671f\u5b58\u5728\u7684\u6d41\u548c\u7a81\u53d1\u6d41\u91cf\uff0c\u4f8b\u5982\u5178\u578b\u7684 Web \u6d4f\u89c8\u4f1a\u8bdd\u751f\u6210\u7684\u6d41\u91cf\u3002<\/p>\n<\/li>\n<li>\n<p>\u8be5\u7b97\u6cd5\u4e0d\u5e94\u8be5\u7531\u4e8e\u7ade\u4e89\u5e26\u5bbd\u800c\u4f7f\u5f97 TCP \u6d41\u9965\u997f\uff0c\u5e76\u4e14\u5e94\u8be5\u5c3d\u53ef\u80fd\u907f\u514d TCP \u6d41\u9965\u997f<\/p>\n<\/li>\n<li>\n<p>\u8be5\u7b97\u6cd5\u5e94\u8be5\u5c3d\u5feb\u9002\u5e94\u6d41\u5f00\u59cb\u65f6\u7684\u521d\u59cb\u7f51\u7edc\u6761\u4ef6\u3002<\/p>\n<\/li>\n<li>\n<p>\u5982\u679c RTP \u6d41\u505c\u6b62\u6216\u4e0d\u8fde\u7eed\u65f6\uff08\u4f8b\u5982\uff0c\u5f53\u4f7f\u7528 VAD \u8bed\u97f3\u6d3b\u52a8\u68c0\u6d4b\u65f6\uff09\uff0c\u7b97\u6cd5\u5e94\u8be5\u662f\u7a33\u5b9a\u7684\u3002<\/p>\n<\/li>\n<li>\n<p>\u5728\u53ef\u80fd\u7684\u60c5\u51b5\u4e0b\uff0c\u5f53 RTP \u6d41\u5171\u4eab\u4e00\u4e2a\u516c\u7528\u7684\u74f6\u9888\u65f6\uff0c\u7b97\u6cd5\u5e94\u8be5\u7efc\u5408\u8003\u8651\u5728\u4e24\u4e2a\u7aef\u70b9\u4e4b\u95f4\u53d1\u9001\u7684\u591a\u4e2a RTP \u6d41\u4e4b\u95f4\u7684\u4fe1\u606f\uff0c\u65e0\u8bba\u8fd9\u4e9b\u6d41\u662f\u5426\u590d\u7528\u76f8\u540c\u7684\u7aef\u53e3\u3002<\/p>\n<\/li>\n<li>\n<p>\u8be5\u7b97\u6cd5\u4e0d\u5e94\u8be5\u9700\u8981\u6765\u81ea\u7f51\u7edc\u5143\u7d20\u7684\u4efb\u4f55\u7279\u6b8a\u652f\u6301\u624d\u80fd\u4f20\u8fbe\u4e0e\u62e5\u585e\u76f8\u5173\u7684\u4fe1\u606f\u3002<\/p>\n<\/li>\n<li>\n<p>\u7531\u4e8e\u8fd9\u91cc\u5047\u8bbe\u662f\u4e00\u7ec4 RTP \u6d41\uff0c\u53cd\u5411\u901a\u9053\u901a\u5e38\u5e94\u8be5\u901a\u8fc7 RTP \u63a7\u5236\u534f\u8bae (RTCP) \u5b8c\u6210<\/p>\n<\/li>\n<li>\n<p>\u7531\u8be5\u7b97\u6cd5\u7ba1\u7406\u7684\u6d41\u548c\u5728\u74f6\u9888\u5904\u76f8\u4e92\u7ade\u4e89\u7684\u6d41\u53ef\u80fd\u5177\u6709\u4e0d\u540c\u7684\u5dee\u5206\u670d\u52a1\u4ee3\u7801\u70b9 (DSCP)\u00a0<a href=\"https:\/\/walterfan.github.io\/webrtc_note\/3.media\/webrtc_rcc.html#id26\">2<\/a>\u00a0[RFC5865] \u6807\u8bb0\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e\u6d41\u91cf\u7c7b\u578b\uff0c\u6216\u8005\u53ef\u80fd\u53d7\u57fa\u4e8e\u6d41\u7684 QoS \u7684\u7ea6\u675f\u3002<\/p>\n<\/li>\n<li>\n<p>\u8be5\u7b97\u6cd5\u5e94\u8be5\u5c06\u53cd\u5411\u4fe1\u9053(backchannel)\u4fe1\u606f\u7684\u610f\u5916\u7f3a\u5931, \u611f\u77e5\u4e3a\u4fe1\u9053\u8fc7\u5ea6\u4f7f\u7528\u95ee\u9898\u7684\u53ef\u80fd\u6307\u793a\uff0c\u5e76\u76f8\u5e94\u5730\u505a\u51fa\u53cd\u5e94, \u4ee5\u907f\u514d\u5bfc\u81f4\u62e5\u585e\u5d29\u6e83\u7684\u7a81\u53d1\u4e8b\u4ef6\u3002<\/p>\n<\/li>\n<li>\n<p>\u5f53\u5e94\u7528\u4e3b\u52a8\u961f\u5217\u7ba1\u7406 (AQM: Active Queue Management) \u7b97\u6cd5\u65f6\uff0c\u8be5\u7b97\u6cd5\u5e94\u8be5\u662f\u7a33\u5b9a\u7684\u5e76\u4fdd\u6301\u4f4e\u5ef6\u8fdf\u3002\u53e6\u8bf7\u6ce8\u610f\uff0c\u8fd9\u4e9b\u7b97\u6cd5\u53ef\u80fd\u9002\u7528\u4e8e\u74f6\u9888\u4e2d\u7684\u591a\u4e2a\u961f\u5217\u6216\u5355\u4e2a\u961f\u5217\u3002<\/p>\n<\/li>\n<\/ol>\n<p>\u7b80\u800c\u8a00\u4e4b\uff0c\u9488\u5bf9\u4ee5\u4e0b\u51e0\u4e2a\u4e3b\u8981\u7684\u6307\u6807\uff0c\u6709\u5982\u4e0b\u9700\u6c42<\/p>\n<table>\n<thead>\n<tr>\n<th>\u6307\u6807<\/th>\n<th>\u9700\u6c42<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u5ef6\u8fdf Latency<\/td>\n<td>\u5c3d\u53ef\u80fd\u4f4e\u4e8e 100ms<\/td>\n<\/tr>\n<tr>\n<td>\u4e22\u5305 Packet losses<\/td>\n<td>\u8d8a\u5c11\u8d8a\u597d\uff0c\u53ef\u5e94\u7528 FEC<\/td>\n<\/tr>\n<tr>\n<td>\u541e\u5410\u91cf Throughput<\/td>\n<td>\u8d8a\u9ad8\u8d8a\u597d<\/td>\n<\/tr>\n<tr>\n<td>\u7a81\u53d1\u6027 Burstiness<\/td>\n<td>\u8981\u4ea7\u751f\u4e00\u4e2a\u5e73\u6ed1\u7684\u53d1\u9001\u901f\u7387<\/td>\n<\/tr>\n<tr>\n<td>\u516c\u5e73\u6027 Fairness<\/td>\n<td>\u5e94\u5728\u5b9e\u65f6\u5a92\u4f53\u6d41\u548c\u6570\u636e\u6d41\u4e4b\u95f4\u516c\u5e73\u5730\u5206\u4eab\u5e26\u5bbd<\/td>\n<\/tr>\n<tr>\n<td>\u9965\u997f Starvation<\/td>\n<td>\u5a92\u4f53\u6d41\u4e0d\u5e94\u7531\u4e8e\u8fc7\u5ea6\u7ade\u4e89\u800c\u4f7f TCP \u6d41\u9965\u997f<\/td>\n<\/tr>\n<tr>\n<td>\u7f51\u7edc\u652f\u6301 Network support<\/td>\n<td>\u65e0\u9700\u7279\u522b\u7684\u7f51\u7edc\u652f\u6301\u5373\u53ef\u8fd0\u884c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u9009\u62e9<\/h2>\n<p>\u6ee1\u8db3\u8fd9\u4e9b\u8981\u6c42\u7684\u7b97\u6cd5\u8bbe\u8ba1\u9762\u4e34\u7740\u51e0\u4e2a\u9009\u62e9<\/p>\n<ol>\n<li>\n<p>The transport protocol <strong>\u4f20\u8f93\u534f\u8bae<\/strong><\/p>\n<\/li>\n<li>\n<p>Congestion detection <strong>\u62e5\u585e\u68c0\u6d4b<\/strong><\/p>\n<\/li>\n<li>\n<p>The actuation mechanism to be employed <strong>\u6240\u91c7\u7528\u7684\u9a71\u52a8\u673a\u5236<\/strong><\/p>\n<\/li>\n<\/ol>\n<p>\u901a\u8fc7\u7aef\u5230\u7aef\u7684\u5ea6\u91cf\u6765\u68c0\u6d4b\u62e5\u585e\u7684\u65b9\u6cd5\u53ef\u4ee5\u5206\u4e3a\u4e24\u5927\u7c7b\uff1a<\/p>\n<ol>\n<li>\n<p>\u57fa\u4e8e\u4e22\u5305\u7684\u7b97\u6cd5 Loss-based algorithms<\/p>\n<\/li>\n<li>\n<p>\u57fa\u4e8e\u5ef6\u8fdf\u7684\u7b97\u6cd5 Delay-based algorithms<\/p>\n<\/li>\n<\/ol>\n<p>\u62e5\u585e\u68c0\u6d4b\u53ef\u4ee5\u662f\u9690\u5f0f\u7684\uff08\u57fa\u4e8e\u5728\u7aef\u70b9\u6267\u884c\u7684\u7aef\u5230\u7aef\u6d4b\u91cf\uff09\uff0c\u4e5f\u53ef\u4ee5\u662f\u663e\u5f0f\u7684\uff08\u901a\u8fc7\u76d1\u89c6\u8def\u7531\u5668\u7684\u7f13\u51b2\u533a\u957f\u5ea6\uff0c\u5728\u7f51\u7edc\u5143\u7d20\u4e2d\u76f4\u63a5\u6d4b\u91cf\u62e5\u585e\uff09\u3002<\/p>\n<p>\u4e00\u822c\u6765\u8bf4\uff0c\u57fa\u4e8e\u5ef6\u8fdf\u7684\u7b97\u6cd5\u4f18\u4e8e\u57fa\u4e8e\u635f\u5931\u7684\u7b97\u6cd5\uff0c\u6709\u5982\u4e0b\u4e24\u4e2a\u539f\u56e0\uff1a<\/p>\n<ul>\n<li>\n<p>\u9996\u5148\uff0c\u57fa\u4e8e\u5ef6\u8fdf\u7684\u65b9\u6848\u53ef\u4ee5\u5728\u6570\u636e\u5305\u56e0\u7f13\u51b2\u533a\u6ea2\u51fa\u800c\u4e22\u5931\u4e4b\u524d\u68c0\u6d4b\u5230\u62e5\u585e\uff1b<\/p>\n<\/li>\n<li>\n<p>\u5176\u6b21\uff0c\u57fa\u4e8e\u635f\u5931\u7684\u7b97\u6cd5\u65e0\u6cd5\u63a7\u5236\u6392\u961f\u5ef6\u8fdf\uff0c\u56e0\u4e3a\u5b83\u4eec\u901a\u8fc7\u586b\u5145\u548c\u8017\u5c3d Internet \u7f13\u51b2\u533a\u4e0d\u65ad\u63a2\u6d4b\u7f51\u7edc\u53ef\u7528\u5e26\u5bbd\uff0c\u4ece\u800c\u4ea7\u751f\u663e\u7740\u7684\u5ef6\u8fdf\u53d8\u5316\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\n<p>\u663e\u5f0f\u63a7\u5236\u6392\u961f\u5ef6\u8fdf\u4e5f\u662f\u5fc5\u8981\u7684\uff0c\u56e0\u4e3a\u8fc7\u5927\u7684\u7f13\u51b2\u533a\u53ef\u80fd\u4f1a\u5bfc\u81f4\u51e0\u79d2\u7684\u5ef6\u8fdf<\/p>\n<\/li>\n<li>\n<p>\u9700\u8981\u8003\u8651\u7684\u4e00\u4e2a\u91cd\u8981\u95ee\u9898\u662f\u5728\u5c3d\u529b\u800c\u4e3a\u7684\u4e92\u8054\u7f51\u4e2d\u4e0e\u57fa\u4e8e\u635f\u5931\u7684\u6d41\u91cf\u7ade\u4e89\u65f6\uff0c\u9632\u6b62\u57fa\u4e8e\u5ef6\u8fdf\u7684\u6d41\u91cf\u88ab\u997f\u6b7b\u3002<\/p>\n<\/li>\n<li>\n<p>\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u53ef\u4ee5\u4f7f\u7528\u4ece\u7f51\u7edc\u5143\u7d20\u53d1\u9001\u5230\u7aef\u70b9\u7684\u663e\u5f0f\u62e5\u585e\u4fe1\u53f7\u6765\u8865\u5145\u7aef\u5230\u7aef\u6d4b\u91cf\uff0c\u4f8b\u5982\u901a\u8fc7\u4f7f\u7528\u663e\u5f0f\u62e5\u585e\u901a\u77e5 (ECN) \u673a\u5236\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u5173\u4e8e\u9a71\u52a8\u673a\u5236, \u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u6216\u8005\u8ba1\u7b97\u4e00\u4e2a\u00a0congestion window\u00a0(window-based approach) \uff0c\u6216\u8005\u663e\u5f0f\u8ba1\u7b97\u4e00\u4e2a\u00a0sending rate\u00a0(rate-based approach).<\/p>\n<p><strong>\u57fa\u4e8e\u901f\u7387\u7684\u673a\u5236\u7684\u4f7f\u7528\u4f7f\u5f97\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u8ba1\u7b97\u7684\u901f\u7387\u6765\u9a71\u52a8\u5a92\u4f53\u7f16\u7801\u5668\uff0c\u800c\u5728\u57fa\u4e8e\u7a97\u53e3\u7684\u7b97\u6cd5\u7684\u60c5\u51b5\u4e0b\uff0c\u5e94\u8be5\u6267\u884c\u4ece\u7a97\u53e3\u5230\u901f\u7387\u7684\u9002\u5f53\u8f6c\u6362\u3002<\/strong><\/p>\n<h1>\u5ea6\u91cf\u6307\u6807<\/h1>\n<ol>\n<li><strong>Packet Loss \u4e22\u5305<\/strong><\/li>\n<li><strong>RTT \u5f80\u8fd4\u65f6\u95f4<\/strong><\/li>\n<li><strong>Jitter \u6296\u52a8<\/strong><\/li>\n<li><strong>Delay<\/strong><br \/>\n4.1 One Way delay<br \/>\n4.2 One-Way Delay Variation (OWDV)<\/li>\n<\/ol>\n<p>\u524d 3 \u4e2a\u6307\u6807\u4e0d\u7528\u8bf4\u4e86\uff0cRTP \u534f\u8bae\u4e2d\u6709\u8be6\u7ec6\u8bf4\u660e\uff0c\u901a\u8fc7 RTCP \u4e5f\u80fd\u591f\u8ba1\u7b97\u51fa\u6765\uff0c\u53c2\u89c1\u4ee5\u524d\u5199\u7684\u7b14\u8bb0 <a href=\"https:\/\/www.jianshu.com\/p\/3a4142e54f73\">\u5b9e\u65f6\u4f20\u8f93\u534f\u8baeRTP \u548cRTCP<\/a><\/p>\n<p>One way delay (OWD)\u5355\u5411\u5ef6\u8fdf\u5f88\u7b80\u5355\uff0c\u8868\u793a\u63a5\u6536\u65f6\u95f4\u51cf\u53bb\u53d1\u9001\u65f6\u95f4\uff0c\u5982\u56fe\u6240\u793a\uff0c $$OWD = t_i - T_i$$<\/p>\n<p>\u800cOne-Way Delay Variation(OWDV) \u5355\u5411\u5ef6\u8fdf\u53d8\u5316\uff0c\u8868\u793a\u53d1\u9001\u95f4\u9694\u4e0e\u5230\u8fbe\u65f6\u95f4\u4e4b\u95f4\u7684\u5dee<br \/>\n$$OWDV = t<em>i - t<\/em>{i-1} - (T<em>i - T<\/em>{i-1})$$<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/1598924-f2577d12a7c568a0.png?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/480\" alt=\"\" \/><\/p>\n<p>OWDV \u7684\u503c\u6709\u4e09\u79cd\u60c5\u51b5:<\/p>\n<ul>\n<li>\n<ol>\n<li>OWDV &gt; 0: \u6392\u961f\u5ef6\u8fdf\u5728\u589e\u957f<\/li>\n<\/ol>\n<\/li>\n<li>\n<ol start=\"2\">\n<li>OWDV &lt; 0: \u6392\u961f\u5ef6\u8fdf\u5728\u51cf\u5c0f<\/li>\n<\/ol>\n<\/li>\n<li>\n<ol start=\"3\">\n<li>OWDV = 0: \u6392\u961f\u5ef6\u8fdf\u4fdd\u6301\u5728\u4e00\u4e2a\u6052\u5b9a\u7684\u503c:\n<ul>\n<li>3.1 \u62e5\u585e\u961f\u5217\u662f\u7a7a\u7684\uff1a\u53d1\u9001\u901f\u7387\u5c0f\u4e8e\u4f20\u8f93\u80fd\u529b\uff0c\u4e0d\u9700\u8981\u6392\u961f<\/li>\n<li>3.2 \u62e5\u585e\u961f\u5217\u662f\u6ee1\u7684\uff1a\u53d1\u9001\u901f\u7387\u5927\u4e8e\u4f20\u8f93\u80fd\u529b\uff0c\u6392\u961f\u5835\u4f4f\u4e86<\/li>\n<li>3.3 \u62e5\u585e\u961f\u5217\u662f\u7a7a\u7684\uff1a\u53d1\u9001\u901f\u7387\u7b49\u4e8e\u4f20\u8f93\u80fd\u529b\uff0c\u6392\u961f\u6709\u5e8f\u901a\u8fc7<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<p>\u7b2c 3 \u79cd\u60c5\u51b5\u4e0b\uff0c\u961f\u5217\u4fdd\u6301\u4e0d\u53d8\uff0cOWDV \u4ecb\u4e8e\u96f6\u548c\u5176\u6700\u5927\u503c\u4e4b\u95f4\u3002 \u8fd9\u662f\u4e00\u79cd\u79f0\u4e3a\u7ad9\u7acb\u961f\u5217\u7684\u4e0d\u826f\u60c5\u51b5\uff0c\u5b83\u4f1a\u4e0d\u65ad\u5ef6\u8fdf\u4f20\u5165\u6d41\u91cf\u3002 \u56e0\u6b64\uff0c\u4e3a\u4e86\u5728\u5145\u5206\u5229\u7528\u53ef\u7528\u5e26\u5bbd\u7684\u540c\u65f6\u4fdd\u8bc1\u8f83\u5c0f\u7684\u961f\u5217\u5360\u7528\uff0c\u7b97\u6cd5\u5fc5\u987b\u901a\u8fc7\u589e\u52a0\u5176\u53d1\u9001\u901f\u7387\u6765\u6301\u7eed\u63a2\u6d4b\u53ef\u7528\u5e26\u5bbd\uff0c\u76f4\u5230\u68c0\u6d4b\u5230\u6b63\u6392\u961f\u5ef6\u8fdf\u53d8\u5316\u3002 \u6b64\u65f6\uff0c\u53d1\u9001\u901f\u7387\u5e94\u8fc5\u901f\u964d\u4f4e\u3002 \u603b\u800c\u8a00\u4e4b\uff0c\u9700\u8981\u5f15\u5165\u4e00\u4e9b\u6392\u961f\u5ef6\u8fdf\u6765\u8fd0\u884c\u57fa\u4e8e\u5ef6\u8fdf\u53d8\u5316\u7684\u62e5\u585e\u63a7\u5236\u7b97\u6cd5<\/p>\n<h1>GCC<\/h1>\n<p>WebRTC \u4e2d\u5e94\u7528\u8f83\u5e7f\u7684\u662f Google \u63d0\u51fa\u6765\u7684 GCC(Google Congestion Control), \u5b83\u6709\u4e24\u4e2a\u7248\u672c<\/p>\n<ol>\n<li>\n<p>GCC v1:  \u901a\u8fc7 RTP abs_send_time header \u548c RTCP REMB message \u6269\u5c55\uff0c\u57fa\u4e8e\u4e22\u5305\u548c\u5ef6\u8fdf\u4f30\u7b97\u5e26\u5bbd\u5360\u7528\u548c\u662f\u5426\u6709\u62e5\u585e\uff0c\u4ece\u800c\u8c03\u6574\u5a92\u4f53\u6d41\u7684\u53d1\u9001\u901f\u7387\uff0c\u4e3b\u8981\u7684\u4f30\u7b97\u548c\u51b3\u7b56\u5728\u63a5\u6536\u65b9\uff0c\u91c7\u7528\u4e86\u5361\u5c14\u66fc\u6ee4\u6ce2<\/p>\n<\/li>\n<li>\n<p>GCC v2: \u901a\u8fc7 RTP transport wide cc sn header \u548c RTCP transport feedback message \u6269\u5c55\uff0c\u57fa\u4e8e\u4e22\u5305\u548c\u5ef6\u8fdf\u4f30\u7b97\u5e26\u5bbd\u5360\u7528\u548c\u662f\u5426\u6709\u62e5\u585e\uff0c\u4ece\u800c\u8c03\u6574\u5a92\u4f53\u6d41\u7684\u53d1\u9001\u901f\u7387\uff0c\u4e3b\u8981\u7684\u4f30\u7b97\u548c\u51b3\u7b56\u5728\u53d1\u9001\u65b9\uff0c\u91c7\u7528\u4e86\u7ebf\u6027\u56de\u5f52\u548c\u6700\u5c0f\u4e8c\u4e58\u6cd5<\/p>\n<\/li>\n<\/ol>\n<p>\u540e\u9762\u6709\u65f6\u95f4\u6765\u8be6\u7ec6\u8bb2\u8bb2  GCC v2 \u7684\u8bbe\u8ba1\u548c\u5b9e\u73b0<\/p>\n<h1>\u53c2\u8003\u8d44\u6599<\/h1>\n<ul>\n<li>\n<p><a href=\"https:\/\/c3lab.poliba.it\/images\/6\/65\/Gcc-analysis.pdf\">Analysis and Design of the Google Congestion Control for WebRTC<\/a><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/blog.mozilla.org\/webrtc\/what-is-rmcat-congestion-control\/\">What is RMCAT congestion control, and how will it affect WebRTC?<\/a><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/wg\/rmcat\/about\/\">RMCAT work group<\/a><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/wg\/rmcat\/documents\/\">RMCAT documents<\/a>: RTP Media Congestion Avoidance Techniques documents<\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc8825\">RFC8825<\/a>: Overview: Real-Time Protocols for Browser-Based Applications<\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc8836\">RFC8836<\/a>: Congestion Control Requirements for Interactive Real-Time Media<\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc8083\">RFC8083<\/a>: Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions<\/p>\n<\/li>\n<li>\n<p><a href=\"ttps:\/\/datatracker.ietf.org\/doc\/html\/rfc8698\">RFC8698 Network-Assisted Dynamic Adaptation (NADA): A Unified Congestion Control Scheme for Real-Time Media<\/a><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc8888\">RFC8888 RTP Control Protocol (RTCP) Feedback for Congestion Control<\/a><\/p>\n<\/li>\n<li>\n<p><a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc3168\">RFC3168 The Addition of Explicit Congestion Notification (ECN) to IP<\/a><\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Abstract \u62e5\u585e\u63a7\u5236\u6280\u672f\u7684\u7b14\u8bb0\u4e00 Authors Walter Fan \u00a0Category\u00a0\u00a0\u00a0 \u00a0learning\u00a0notes\u00a0\u00a0 Status WIP Updated 2022-2-10 \u5f15\u8a00 \u5982\u679c\u5e26\u5bbd\u8db3\u591f\u7684\u8bdd, \u6ca1\u6709\u62e5\u585e,\u6ca1\u6709\u5927\u7684\u5ef6\u8fdf\u548c\u6296\u52a8, \u90a3\u4e48\u8bed\u97f3\u548c\u89c6\u9891\u7684\u53d1\u9001\u548c\u63a5\u6536\u90fd\u4f1a\u5f88\u987a\u6ed1,\u4e00\u5207\u4f1a\u5f88\u7f8e\u597d. \u73b0\u5b9e\u603b\u662f\u5f88\u6b8b\u9177\u7684, \u7f51\u7edc\u4f1a\u65ad, \u4f1a\u4e22\u5305, \u4f1a\u53d8\u6162\uff0c\u5728\u8def\u7531\u8282\u70b9\u4e0a\u4f1a\u6392\u961f\uff0c\u4f1a\u62e5\u585e\uff0c\u5c31\u8c61\u57ce\u5e02\u7684\u73af\u7ebf\u9053\u8def\uff0c\u5e73\u5e38\u8f66\u6765\u8f66\u5f80\uff0c\u9053\u8def\u901a\u7545\uff0c\u4e00\u5230\u4e0a\u4e0b\u73ed\u7684\u65f6\u5019\uff0c\u5927\u5927\u5c0f\u5c0f\u7684\u8f66\u8f86\u5c31\u8c61\u4e4c\u9f9f\u4e00\u6837\u6162\u6162\u5411\u524d\u722c\u3002 \u89c6\u9891\u4f1a\u8bae\u9700\u8981\u4f4e\u5ef6\u8fdf\u548c\u9ad8\u5e26\u5bbd\uff0c\u53ef\u662f\u5b9e\u9645\u60c5\u51b5\u4e2d\uff0c\u9ad8\u5e26\u5bbd\u662f\u96be\u4ee5\u4fdd\u8bc1\u7684\uff0c\u4e00\u65e6\u7f51\u7edc\u51fa\u73b0\u62e5\u585e\uff0c\u539f\u672c\u5c31\u4e0d\u5bbd\u9614\u7684\u201c\u9a6c\u8def\u201d \u5835\u5f97\u66f4\u7a84\uff0c\u5ef6\u8fdf\u66f4\u5927\u3002\u8fd9\u65f6\u5019\uff0c\u5c31\u9700\u8981\u505a\u62e5\u585e\u63a7\u5236 \u5728\u7f51\u7edc\u4f1a\u8bae\u4e2d\uff0c\u5982\u679c\u5ef6\u8fdf\u592a\u5927\uff0c\u5bf9\u5728\u7ebf\u4ea4\u6d41\u5c31\u4f1a\u4ea7\u751f\u5f71\u54cd\u3002\u8bed\u97f3\u4f1a\u611f\u89c9\u5f88\u660e\u663e\uff0c\u89c6\u9891\u76f8\u5bf9\u8fdf\u949d\u4e00\u4e9b\u3002 \u4ee5\u89c6\u9891\u6765\u8bf4\uff0c\u636e\u7814\u7a76\uff0c\u5927\u81f4\u7684\u5173\u7cfb\u5982\u4e0b \u5ef6\u8fdf \u611f\u89c9 0 ~ 400 \u6beb\u79d2 \u5728\u4ea4\u6d41\u8fc7\u7a0b\u4e2d\u611f\u89c9\u4e0d\u5230\u5ef6\u8fdf 400 ~ 800 \u6beb\u79d2 \u80fd\u611f\u89c9\u5230\u5ef6\u8fdf\uff0c\u4f46\u4e0d\u5f71\u54cd\u6c9f\u901a\u548c\u4ea4\u6d41 800 \u6beb\u79d2\u53ca\u4ee5\u4e0a \u80fd\u611f\u89c9\u5230\u5ef6\u8fdf\uff0c\u5e76\u4e14\u5f71\u54cd\u6c9f\u901a\u548c\u4ea4\u6d41 \u4ee5\u4e00\u4e2a\u6bcf\u79d2 24 \u5e27 640*480 \u5206\u8fa8\u7387\uff0c\u4ee5 H.264 \u7f16\u7801\u7684\u89c6\u9891\u6d41\uff0c\u89c6\u9891\u7684\u6bd4\u7279\u7387\u548c\u7528\u6237\u611f\u89c9\u7684\u5173\u7cfb\u5982\u4e0b \u6bd4\u7279\u7387 \u611f\u89c9 &gt; 800kbps \u7528\u6237\u5bf9\u89c6\u9891\u7684\u6e05\u6670\u5ea6\u611f\u5230\u6ee1\u610f\uff0c\u611f\u77e5\u4e0d\u5230\u89c6\u9891\u56fe\u50cf\u4fe1\u606f\u7684\u4e22\u5931 480 ~ 800kbps \u7528\u6237\u5bf9\u89c6\u9891\u7684\u6e05\u6670\u5ea6\u57fa\u672c\u6ee1\u610f\uff0c\u6709\u4e9b\u4eba\u80fd\u611f\u77e5\u5230\u89c6\u9891\u56fe\u50cf\u4fe1\u606f\u7684\u4e22\u5931 &lt; [&hellip;] <a class=\"read-more\" href=\"https:\/\/www.fanyamin.com\/wordpress\/?p=452\" title=\"Permanent Link to: \u62e5\u585e\u63a7\u5236\u6280\u672f\u7b14\u8bb0\u4e00\uff1a\u7406\u8bba\u7bc7\">&rarr;Read&nbsp;more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-452","post","type-post","status-publish","format-standard","hentry","category-webrtc"],"_links":{"self":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/452"}],"collection":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=452"}],"version-history":[{"count":2,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/452\/revisions"}],"predecessor-version":[{"id":457,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/452\/revisions\/457"}],"wp:attachment":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=452"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=452"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=452"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}