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<p><a href="https://netease.im/price/live"><span style="color: rgb(0, 56, 132);">https://netease.im/price/live</span></a><span style="color: rgb(57, 57, 57);"> 网易云信价格</span></p><p><a href="https://github.com/netease-im/weapp-netcall"><span style="color: rgb(0, 56, 132);">https://github.com/netease-im/weapp-netcall</span></a><span style="color: rgb(57, 57, 57);"> </span><span style="font-size: 16px; color: rgb(36, 41, 46); background-color: rgb(255, 255, 255);">网易云信视频DEMO小程序版本(以下简称视频小程序DEMO)是一套结合网易云信直播点播能力,基于微信小程序平台原生开发的视频直播点播小程序。为开发者演示直播推流、直播播放、点播播放等能力。</span></p><p><span style="font-size: 16px; color: rgb(36, 41, 46); background-color: rgb(255, 255, 255);"><br/></span></p><p><span style="font-size: 16px; color: rgb(36, 41, 46); background-color: rgb(255, 255, 255);">anyRTC官方网址:</span><a href="https://www.anyrtc.io/resoure"><span style="font-size: 16px; color: rgb(3, 102, 214); background-color: rgb(255, 255, 255);">https://www.anyrtc.io</span></a><span style="color: rgb(57, 57, 57);"> </span><a href="https://github.com/anyRTC/anyRTC-RTMPC-Android"><span style="color: rgb(0, 56, 132);">https://github.com/anyRTC/anyRTC-RTMPC-Android</span></a><span style="color: rgb(57, 57, 57);"> </span><span style="font-size: 16px; color: rgb(36, 41, 46); background-color: rgb(255, 255, 255);">基于RTMP和RTC混合引擎的在线视频连麦互动直播</span></p><p><span style="font-size: 16px; color: rgb(36, 41, 46); background-color: rgb(255, 255, 255);"><br/></span></p><p><span style="font-size: 16px; color: rgb(36, 41, 46); background-color: rgb(255, 255, 255);"><br/></span></p><p><span style="color: rgb(57, 57, 57);">阿里云直播方案 </span><a href="https://www.aliyun.com/solution/media?spm=5176.166693.1146454.44.6bb12c66mpHmgR"><span style="color: rgb(0, 56, 132);">https://www.aliyun.com/solution/media?spm=5176.166693.1146454.44.6bb12c66mpHmgR</span></a></p><p><br/></p><p><!--5f39ae17-8c62-4a45-bc43-b32064c9388a:W3siYmxvY2tJZCI6IjkzMTgtMTU0MzYzOTc5MzA0NiIsImJsb2NrVHlwZSI6ImltYWdlIiwic3R5bGVzIjp7ImJhY2stY29sb3IiOiIiLCJwYWRkaW5nIjoiIiwiaGVpZ2h0IjoyODgsIndpZHRoIjo2MjB9LCJ0eXBlIjoiaW1hZ2UiLCJzb3VyY2UiOiJodHRwczovL25vdGUueW91ZGFvLmNvbS95d3MvcmVzLzMzOTkvV0VCUkVTT1VSQ0U5YTMzMGUxYWVlOTIzYTdiNTU5MWQ2NTMzNzFlYmZiNiJ9XQ==--></p><p><!--5f39ae17-8c62-4a45-bc43-b32064c9388a:[{"blockId":"3688-1543638319384","blockType":"paragraph","styles":{"align":"left","indent":0,"text-indent":0,"line-height":1.75,"back-color":"","padding":""},"type":"paragraph","richText":{"data":[{"char":"h","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"t","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"t","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"p","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"s","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":":","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"/","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"/","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"n","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"e","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"t","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"e","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"a","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"s","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"e","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":".","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"i","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"m","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"/","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"p","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"r","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"i","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"c","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"e","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"/","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"l","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"i","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"v","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":"e","styles":{"underline":true,"color":"#003884","href":"https://netease.im/price/live"}},{"char":" 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src="/ueditor/php/upload/image/20181201/1543641029884687.png" title="1543641029884687.png" alt="截图.png"/></p><p><br/></p><p><br/></p><h1 class="title-article" style="box-sizing: inherit; outline: 0px; margin: 0px; padding: 0px; font-size: 24px; word-wrap: break-word; color: rgb(51, 51, 51); font-family: "SF Pro Display", Roboto, Noto, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">rtmp hls web-rtc推流协议介绍</h1><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">推流,指的是把采集阶段封包好的内容传输到服务器的过程。介绍一下目前有主流的推送协议,以及各自的优缺点。</p><ul style="list-style-type: none;" class=" list-paddingleft-2"><li><p>RTMP<br style="box-sizing: border-box; outline: 0px; margin: 0px; padding: 0px; word-wrap: break-word;"/></p></li></ul><p><br style="box-sizing: border-box; outline: 0px; margin: 0px; padding: 0px; word-wrap: break-word; color: rgb(51, 51, 51); font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; font-size: 14px; white-space: normal; background-color: rgb(255, 255, 255);"/></p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">RTMP是Real Time Messaging Protocol(实时消息传输协议)的缩写,是Adobe公司为Flash/AIR平台和服务器之间音、视频及数据传输开发的实时消息传送协议。RTMP协议基于TCP,包括RTMP基本协议及RTMPT/RTMPS/RTMPE等多种变种。</p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">RTMP协议中,视频必须是H264编码,音频必须是AAC或MP3编码,且多以flv格式封包。RTMP是目前最主流的流媒体传输协议,对CDN支持良好,实现难度较低,是大多数的直播平台的选择。</p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">不过RTMP有着一个最大的不足——不支持浏览器,且Adobe已不再更新。因此直播服务要支持浏览器的话,需要另外的推送协议支持。</p><ul style="list-style-type: none;" class=" list-paddingleft-2"><li><p>HLS<br style="box-sizing: border-box; outline: 0px; margin: 0px; padding: 0px; word-wrap: break-word;"/></p></li></ul><p><br style="box-sizing: border-box; outline: 0px; margin: 0px; padding: 0px; word-wrap: break-word; color: rgb(51, 51, 51); font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; font-size: 14px; white-space: normal; background-color: rgb(255, 255, 255);"/></p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">Http Live Streaming是由Apple公司定义的基于HTTP的流媒体实时传输协议。它的原理是将整个流分为多个小的文件来下载,每次只下载若干个。服务器端会将最新的直播数据生成新的小文件,客户端只要不停的按顺序播放从服务器获取到的文件,就实现了直播。基本上,HLS是以点播的技术实现了直播的体验。因为每个小文件的时长很短,客户端可以很快地切换码率,以适应不同带宽条件下的播放。</p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">分段推送的技术特点,决定了HLS的延迟一般会高于普通的流媒体直播协议。</p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">传输内容包括两部分:一是M3U8描述文件,二是TS媒体文件。TS媒体文件中的视频必须是H264编码,音频必须是AAC或MP3编码。</p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">由于数据通过HTTP协议传输,所以完全不用考虑防火墙或者代理的问题,而且分段文件的时长很短,不过HLS的 </p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(79, 79, 79); font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; background-color: rgb(255, 255, 255);"> iOS和 Android 都天然支持这种协议,配置简单,直接使用 video 标签即可</span></p><ul style="list-style-type: none;" class=" list-paddingleft-2"><li><p>WebRTC</p></li><li><p><span style="color: rgb(79, 79, 79); font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; background-color: rgb(255, 255, 255);"><span style="color: rgb(79, 79, 79); font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; background-color: rgb(255, 255, 255);">google推出WebRTC,</span>使用RTP协议传输。</span><br/></p></li></ul><p><br style="box-sizing: border-box; outline: 0px; margin: 0px; padding: 0px; word-wrap: break-word; color: rgb(51, 51, 51); font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; font-size: 14px; white-space: normal; background-color: rgb(255, 255, 255);"/></p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">WebRTC(Web Real-Time Communication),即“源自网页即时通信”。WebRTC是一个支持浏览器进行实时语音、视频对话的开源协议。WebRTC的支持者甚多,Google、Mozilla、Opera推动其成为W3C推荐标准。</p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">WebRTC支持目前的主流浏览器,并且基于SRTP和UDP,即便在网络信号一般的情况下也具备较好的稳定性。</p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">此外,WebRTC可以实现点对点通信,通信双方延时低,是实现“连麦”功能比较好的选择。</p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);">拉流是指服务器已有直播内容,用指定地址进行拉取的过程。</p><p style="box-sizing: border-box; outline: 0px; margin-top: 0px; margin-bottom: 16px; padding: 0px; color: rgb(79, 79, 79); line-height: 26px; overflow-x: auto; word-wrap: break-word; font-family: -apple-system, "SF UI Text", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif, SimHei, SimSun; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(51, 51, 51); font-family: Arial; font-size: 14px; background-color: rgb(255, 255, 255);">下面介绍一下这三种解码的效率如何:采用MediaCodec的硬件加速解码与libvpx相比,fps没有明显的变化保持在28左右,但是cpu的利用率可以减少一半,这样就可以解放CPU去执行其他的任务,UI响应会更及时,带来更好的用户体验。</span></p><p><br/></p><p><br/></p><h1 class="header" style="box-sizing: inherit; font-size: 2rem; margin: 0px 0px 1rem; font-family: " pingfang="" helvetica="" microsoft="" yahei="" noto="" sans="" cjk="" line-height:="" padding:="" min-height:="" word-break:="" word-wrap:="" color:="" white-space:="" background-color:="">RTMP、WebRTC、UDP 三种互动直播方案的优劣比较</h1><p>原文 https://www.oschina.net/news/95208/osc-yuanchuanghui-wuhan-421<br/></p><p>那么互动直播是怎样实现的呢?主要有以下几种可以实现的技术方案:</p><p><br/></p><ol class=" list-paddingleft-2" style="list-style-type: decimal;"><li><p>基于RTMP 和 CDN 技术的连麦</p></li><li><p>基于 WebRTC(P2P)与旁路直播的连麦</p></li><li><p>基于低延时网络的连麦</p></li></ol><p><br/></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">那这三种技术方案该如何权衡选择呢?它们又有何优劣呢?<br style="box-sizing: inherit;"/></p><h3 style="box-sizing: inherit; font-family: " pingfang="" helvetica="" microsoft="" yahei="" noto="" sans="" cjk="" line-height:="" margin:="" 1.2em="" 0px="" font-weight:="" padding:="" font-size:="" border:="" color:="" white-space:="" background-color:=""><span style="box-sizing: inherit; font-weight: 700;">基于 RTMP 技术的连麦</span></h3><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><img src="/ueditor/php/upload/image/20181201/1543642017213810.png" class="zoom-in-cursor" style="box-sizing: border-box; border: 0px; margin: auto; max-width: 80%; vertical-align: middle; height: auto !important; cursor: zoom-in;"/></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">当有连麦者时,则主播端和连麦端,都分别推一路 RTMP 流到 CDN,CDN 再将这两路 RTMP 流发送给观众端,观众端将两路 RTMP 流合成为一个画面。<br style="box-sizing: inherit;"/></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">RTMP 是基于 TCP 的标准协议,与 CDN 架构兼容,对客户来说在现有单向直播架构上,接入成本比较低,但是缺点也很明显:</p><ul class=" list-paddingleft-2" style="box-sizing: inherit; padding: 0px 0px 0px 2.5em; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><li><p style="box-sizing: inherit; margin-top: 0px; margin-bottom: 0px; line-height: 28px;">主播与连麦者交互时,声音会产生干扰,形成回音;</p></li></ul><ul class=" list-paddingleft-2" style="box-sizing: inherit; padding: 0px 0px 0px 2.5em; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><li><p style="box-sizing: inherit; margin-top: 0px; margin-bottom: 0px; line-height: 28px;">播与连麦者进行交互,在 CDN 中传输延时较大;</p></li></ul><ul class=" list-paddingleft-2" style="box-sizing: inherit; padding: 0px 0px 0px 2.5em; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><li><p style="box-sizing: inherit; margin-top: 0px; margin-bottom: 0px; line-height: 28px;">观众端要接收两条视频流,带宽、流量消耗过大,并且两路视频流解码播放,耗费CPU等资源也非常多。</p></li></ul><h3 style="box-sizing: inherit; font-family: " pingfang="" helvetica="" microsoft="" yahei="" noto="" sans="" cjk="" line-height:="" margin:="" 1.2em="" 0px="" font-weight:="" padding:="" font-size:="" border:="" color:="" white-space:="" background-color:=""><span style="box-sizing: inherit; font-weight: 700;">基于 WebRTC 方式的连麦</span></h3><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><span style="box-sizing: inherit; font-weight: 700;"><img src="/ueditor/php/upload/image/20181201/1543642018779796.png" class="zoom-in-cursor" style="box-sizing: border-box; border: 0px; margin: auto; max-width: 80%; vertical-align: middle; height: auto !important; cursor: zoom-in;"/></span></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">WebRTC 是 Google 公司的开源技术,降低了音视频通信的接入门槛。也有公司采用该项技术实现连麦。主播与连麦 用户采用 P2P 方式进行交互,然后在主播端进行混流,然后在 CDN 上进行混流,发送到观众端。</p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">WebRTC 的好处在于用户体验好,不需要安装东西,分享一个链接就可以看。</p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">但这套方案需要主播端上传两路视频:一路 P2P 与连麦者进行交互,一路使用 RTMP 推到 CDN。还要下载一路视频:连麦者P2P发送过来的交互数据。对主播端带宽需求较高。</p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">另外,主播端需要进行多路视频的编码、解码,又对主播端设备配置要求较高。而由于主播端和连麦者经过 CDN 合并成一路,无法实现主播端和连麦者视频大小窗口切换。<br style="box-sizing: inherit;"/></p><h3 style="box-sizing: inherit; font-family: " pingfang="" helvetica="" microsoft="" yahei="" noto="" sans="" cjk="" line-height:="" margin:="" 1.2em="" 0px="" font-weight:="" padding:="" font-size:="" border:="" color:="" white-space:="" background-color:=""><span style="box-sizing: inherit; font-weight: 700;">基于低延时网络的连麦</span><br style="box-sizing: inherit;"/></h3><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">基于 UDP 的私有协议与 RTMP 相比具有先天的优势,它是面向无连接的,避免了 TCP 做网络质量控制所需要的开销,能够做到比较低的延迟。<br style="box-sizing: inherit;"/></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">但是私有协议的兼容性不好,如果采用该方案也需要解决一系列的技术问题:</p><ul class=" list-paddingleft-2" style="box-sizing: inherit; padding: 0px 0px 0px 2.5em; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><li><p style="box-sizing: inherit; margin-top: 0px; margin-bottom: 0px; line-height: 28px;">UDP 的可靠性传输如丢包重传、网络抖动的处理</p></li></ul><ul class=" list-paddingleft-2" style="box-sizing: inherit; padding: 0px 0px 0px 2.5em; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><li><p style="box-sizing: inherit; margin-top: 0px; margin-bottom: 0px; line-height: 28px;">网路拥塞的控制算法</p></li></ul><ul class=" list-paddingleft-2" style="box-sizing: inherit; padding: 0px 0px 0px 2.5em; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><li><p style="box-sizing: inherit; margin-top: 0px; margin-bottom: 0px; line-height: 28px;">在全球节点的部署与智能调度</p></li></ul><ul class=" list-paddingleft-2" style="box-sizing: inherit; padding: 0px 0px 0px 2.5em; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><li><p style="box-sizing: inherit; margin-top: 0px; margin-bottom: 0px; line-height: 28px;">各种端的全面支持</p></li></ul><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">而以上问题都是在短期内很难实现的。<br style="box-sizing: inherit;"/></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:="">基于 RTMP 和 CDN 技术的连麦方案,对于产品来说非常可靠稳定,但可靠的同时延时也在增大,且使用两路 RTMP 推流拉流既耗带宽又耗 CPU。基于 WebRTC P2P 方式的连麦,接入门槛低,用户体验好,却对主播端带宽及设备配置要求较高。基于低延时网络的连麦看起来很美,但私有协议的兼容性令人头大。</p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><span style="color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" background-color:="">以视频直播技术为核心,围绕互动直播技术的思考与实践、低延时的 P2P HLS 直播技术实践、连麦直播技术在微信小程序上的探索和实践、视频压缩目前的情况和进展、使用阿里云 VR 技术构建优酷流畅清晰 VR 直播体验,5 个前沿直播技术主题,与你进行一场关于视频直播,面对面的技术对话。</span></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><span style="color: rgba(0, 0, 0, 0.87); font-family: " pingfang="" helvetica="" microsoft="" yahei="" noto="" sans="" cjk="" font-size:="" background-color:="">用UDP有一个很大的问题,就是运营商限流一般都会先拿UDP开刀,所以为了均衡性能和可用性,可能需要混合UDP和TCP的方案。</span></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><span style="color: rgba(0, 0, 0, 0.87); font-family: " pingfang="" helvetica="" microsoft="" yahei="" noto="" sans="" cjk="" font-size:="" background-color:="">目前主流的是RTMP 份额估计60-80%</span></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><span style="color: rgba(0, 0, 0, 0.87); font-family: " pingfang="" helvetica="" microsoft="" yahei="" noto="" sans="" cjk="" font-size:="" background-color:=""><br/></span></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><span style="color: rgba(0, 0, 0, 0.87); font-family: " pingfang="" helvetica="" microsoft="" yahei="" noto="" sans="" cjk="" font-size:="" background-color:=""></span></p><h1 class="title" style="box-sizing: border-box; font-size: 34px; margin: 20px 0px 0px; font-family: -apple-system, " sf="" ui="" pingfang="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" line-height:="" color:="" white-space:="" background-color:="" word-break:="" break-word="">WebRTC为什么不能做直播平台</h1><p><strong>WebRTC定义:</strong></p><p>WebRTC is a free, open projectthat provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.</p><p>Our mission:To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.</p><p>The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others. This page is maintained by the Google Chrome team.</p><p>——来自WebRTC官网</p><p>定义说明了WebRTC可以为浏览器,手机和物联网设备构建富媒体和高质量的实时通信应用。按照定义来说,WebRTC做直播理论上是没有问题的。但是现实情况不容乐观!我们主要从以下几个方面来说一下:</p><h1>浏览器</h1><p>如果直接使用WebRTC直接推流直播的话,目前Google浏览器最多可以支持6-8个人,人数再多的话,浏览器就崩溃了。不是使用直播推流不就可以了。理论上也是这样的,但是现实很残酷。Chrome虽然可以用相关的js的API获取到摄像头和麦克风的数据。但是如果长时间直播,Chrome的稳定性堪忧,我们项目的经验是,chrome这样运行24小时以上内存占用很厉害,而且容易崩溃。</p><h1>网络</h1><p>如果不直接推流,而是通过WebRTC把流推给中转服务器,这样是可行的。完全没有问题。<strong>中国的网络环境相对于美国来说是比较差的</strong>,“人多就会卡”这是一些人使用WebRTC做直播的感受。5G普及的时候,这个问题可以得到解决。</p><h1>使用规模</h1><p>如果你有10万粉丝同时观看的话,通过推流(标准流大概14kb)到中转服务器,分发给10万观众,那么你的服务器宽带大概需要:100000x40KB=4000MB=4G。按照Ucloud直播云的价格计算的话,一天的费用大概是:500x1.1+3500x0.9=3700。这是10万人一天的宽带费用。据蓝鲸TMT的测算,按照去年的标准来算,直播平台的带宽通常取本月带宽峰值月结,如果按照峰值100万人来结算,<strong>就意味着带宽为1.5T,1.5T现在市场价最低大约是每月3000万(1T=1024G)。</strong></p><h1>音视频编码部分</h1><p>vpx编码器太弱,专利原因无法使用H264,所以需要自己改H264或者H265的代码。WebRTC人声编码还是很可疑的,<strong>但是对于音乐和非人声效果很糟糕</strong>。</p><h1>兼容性</h1><p>你要保证你的用户使用的都是支持WebRTC的浏览器。<strong>那些用IE8的怎么办?</strong></p><p>所以WebRTC在当前阶段来说,成为直播平台还是有很多障碍的。</p><p>那么问题来了,现在的直播平台是怎么做的呢?</p><p>我们来大体了解一下。</p><p><br/></p><p><br/></p><p><img data-original-src="//upload-images.jianshu.io/upload_images/4010229-50fa78298a280423.jpg" data-original-width="418" data-original-height="183" data-original-format="image/jpeg" data-original-filesize="16887" class="" style="cursor: zoom-in;" src="//upload-images.jianshu.io/upload_images/4010229-50fa78298a280423.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/418/format/webp"/></p><p>直播的整体流程</p><p>直播视频采集端,由主播通过摄像头手机等采集设备,采集视音频流,编码后采用RTMP协议推流到直播流服务器。这里采用H.264编码对视频流进行编码,使用AAC对音频流进行编码,采用这两种编码的原因是hls协议要求使用这两种编码。 接下来直播服务器会对从采集端推送的流进行一定的处理。比如,hls协议会将视频流切片成一个个的TS视频文件缓存在服务器中,同时生成一个m3u8文件记录了视频流中的包含的TS文件。 之后如果有播放器请求某一个直播链接,服务器会使用RTMP或者hls协议将流推送到播放器。那么我们该如果根据情况选择这两种协议呢。首先,我们需要明确一点,这两种协议各有利弊。如下所示:</p><p>RTMP:RTMP(Real Time Messaging Protocol)实时消息传送协议是Adobe Systems公司为Flash播放器和服务器之间音频、视频和数据传输开发的开放协议。支持FlashPlayer等网页播放器,移动端支持Vitamio。延迟在三秒左右,实时性较高。</p><p>HLS (HTTP Live Streaming),Apple的动态码率自适应技术。主要用于PC和Apple终端的音视频服务。包括一个m3u(8)的索引文件,TS媒体分片文件和key加密串文件。支持Apple原生产品,Android3.0以上的提供原生支持,桌面端的浏览器提供插件支持,例如:JWPlayer。根据TS长度不同,一般会有10s的延迟。</p><p>综合以上因素,我们认为如果对实时性要求较高,那么使用RTMP会比较好。网页端使用RTMP会比较好,因为Flash Player原生支持,而大多数的浏览器都会安装Flash player。而在移动端如果对实时性要求不高,那么采用hls比较好,因为ios包括3.0以上的安卓都原生支持hls协议。接下来本文将根据以上的三个步骤的具体实现分别展开说明,为了篇幅考虑,我们会将一些内容放到子文章中。</p><h1>视频采集与编码</h1><p>视频采集可以有多重途径,比如通过电脑摄像头,通过OBS等录屏软件进行录屏,通过手机摄像头采集。由于目前户外直播和移动互联网很火,所以我们就选择实现在安卓设备上通过摄像头采集视频流。 为了实现这一功能,我们使用了一个开源项目javacv 它包含了一些在计算机视觉领域应用比较多的库,我们主要使用的是它的FFMpeg库。使用FFMpeg的FFMpegFrameRecoder类,我们能够方便地将从android摄像头采集到的帧传输到服务器。具体的通过Camera和FFMpeg推流到服务器的实现请看我们的另一篇文章Android使用FFMpeg实现推送视频直播流到服务器。另外FFMpeg也支持H.264和AAC编码。</p><h1>直播流服务器</h1><p>关于直播服务器,我们选择使用我们中国人开发的一个开源项目——srs,它支持RTMP/HTTP/RTSP等协议的流输入,支持RTMP/HDS/HLS/HTTP等协议的流输出,同时它也支持集群。给作者点赞。</p><p>关于srs的安装和使用可以直接看它在github上的wiki,这里不再赘述。需要注意的一点是该项目在centos 6.x 和ubunut12.x上能正常编译通过,但是在比如我使用的ubuntu14.04上会有一些依赖包的缺失。所以为了方便考虑的话,读者可以在centos和ubuntu12.x上进行测试。</p><h1>播放器</h1><p>我们在试验的过程中,使用多种播放器和库在全平台实现了rtmp和hls的播放。在网页端使用了videojs,在安卓端使用vitamio。具体的实现请看我们的另外一篇如何在网页端和移动端播放rtmp和hls视频流</p><h1>总结</h1><p>当然本文中的解决方案只是最简单的,对于直播服务器集群,直播间的创建和管理,直播间直播密码和权限,内容分发网络CDN都没有进行深入的研究。但是通过本实验性项目,我认为对于我们了解整个直播的业务流程还是很有帮助的。</p><p><strong>一些名词释义:</strong></p><p>Real Time Messaging Protocol (RTMP) was initially a proprietary protocol developed by Macromedia for streaming audio, video and data over the Internet, between a Flash player and a server. Macromedia is now owned by Adobe, which has released an incomplete version of the specification of the protocol for public use. (reference from wikipedia )</p><p>Flash Player是天生能够播放RTMP流的,所以RTMP流可以在网页上得到很好的支持,另外也有很多其他浏览器能够支持播放RTMP流,如比较知名的JW player,videoJS。另外RTMP流的延迟只有3s,比较适合一些实时性和互动性较高的直播。</p><p>AAC(Advanced Audio Coding),中文名:高级音频编码,出现于1997年,基于MPEG-2的音频编码技术。由Fraunhofer IIS、杜比实验室、AT&T、Sony等公司共同开发,目的是取代MP3格式。2000年,MPEG-4标准出现后,AAC重新集成了其特性,加入了SBR技术和PS技术,为了区别于传统的MPEG-2 AAC又称为MPEG-4 AAC。</p><p>HLS (HTTP Live Streaming),Apple的动态码率自适应技术。主要用于PC和Apple终端的音视频服务。包括一个m3u(8)的索引文件,TS媒体分片文件和key加密串文件。</p><p><br/><br/>作者:壹颗香菜<br/>链接:https://www.jianshu.com/p/11de091cfd0b<br/>來源:简书<br/>简书著作权归作者所有,任何形式的转载都请联系作者获得授权并注明出处。</p><p><strong>参考资料:</strong></p><p>WebRTC官网:https://webrtc.org/ (需要科学上网)</p><p>知乎:https://www.zhihu.com/question/25497090</p><p>Ucloud:https://docs.ucloud.cn/video/ulive/charge</p><p>In Coding:http://www.sixwolf.net/blog/2016/01/29/直播解决方案-搭建你自己的直播平台/</p><p><br/><br/>作者:壹颗香菜<br/>链接:https://www.jianshu.com/p/11de091cfd0b<br/>來源:简书<br/>简书著作权归作者所有,任何形式的转载都请联系作者获得授权并注明出处。</p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><span style="color: rgba(0, 0, 0, 0.87); font-family: " pingfang="" helvetica="" microsoft="" yahei="" noto="" sans="" cjk="" font-size:="" background-color:=""></span><br/></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><span style="color: rgba(0, 0, 0, 0.87); font-family: " pingfang="" helvetica="" microsoft="" yahei="" noto="" sans="" cjk="" font-size:="" background-color:=""><br/></span></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><span style="color: rgba(0, 0, 0, 0.87); font-family: " pingfang="" helvetica="" microsoft="" yahei="" noto="" sans="" cjk="" font-size:="" background-color:=""><br/></span></p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(51, 51, 51); font-family: " pingfang="" lantinghei="" open="" hiragino="" sans="" microsoft="" wenquanyi="" micro="" white-space:="" background-color:=""><br/></p><p><br/></p><p>原文<a href="https://www.cnblogs.com/lidabo/p/7233154.html" _src="https://www.cnblogs.com/lidabo/p/7233154.html">https://www.cnblogs.com/lidabo/p/7233154.html</a> </p><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">RTMP协议是Real Time Message Protocol(实时信息传输协议)的缩写,它是由Adobe公司提出的一种应用层的协议,用来解决多媒体数据传输流的多路复用(Multiplexing)和分包(packetizing)的问题。随着VR技术的发展,视频直播等领域逐渐活跃起来,RTMP作为业内广泛使用的协议也重新被相关开发者重视起来。正好最近在从事这方面的工作,在此记录下自己对RTMP的理解,文章内容多翻译自英文版RTMP文档,按照本人的理解重新整理,希望可以帮助想要了解RTMP协议的朋友,也方面自己日后查阅。<br/><a id="more"></a></p><hr style="font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; font-size: 13px; white-space: normal; background-color: rgb(255, 255, 255);"/><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"> </p><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="line-height: 1.5; font-size: xx-small;"><strong>1. 总体介绍:</strong></span><br/>RTMP协议是应用层协议,是要靠底层可靠的传输层协议(通常是TCP)来保证信息传输的可靠性的。在基于传输层协议的链接建立完成后,RTMP协议也要客户端和服务器通过“握手”来建立基于传输层链接之上的RTMP Connection链接,在Connection链接上会传输一些控制信息,如SetChunkSize,SetACKWindowSize。其中CreateStream命令会创建一个Stream链接,用于传输具体的音视频数据和控制这些信息传输的命令信息。RTMP协议传输时会对数据做自己的格式化,这种格式的消息我们称之为RTMP Message,而实际传输的时候为了更好地实现多路复用、分包和信息的公平性,发送端会把Message划分为带有Message ID的Chunk,每个Chunk可能是一个单独的Message,也可能是Message的一部分,在接受端会根据chunk中包含的data的长度,message id和message的长度把chunk还原成完整的Message,从而实现信息的收发。<br/><span style="line-height: 1.5; font-size: xx-small;"><strong>2. 握手</strong></span><br/>要建立一个有效的RTMP Connection链接,首先要“<strong>握手</strong>”:客户端要向服务器发送C0,C1,C2(按序)三个chunk,服务器向客户端发送S0,S1,S2(按序)三个chunk,然后才能进行有效的信息传输。RTMP协议本身并没有规定这6个Message的具体传输顺序,但RTMP协议的实现者需要保证这几点:<br/>- 客户端要等收到S1之后才能发送C2<br/>- 客户端要等收到S2之后才能发送其他信息(控制信息和真实音视频等数据)<br/>- 服务端要等到收到C0之后发送S1<br/>- 服务端必须等到收到C1之后才能发送S2<br/>- 服务端必须等到收到C2之后才能发送其他信息(控制信息和真实音视频等数据)<br/>如果每次发送一个握手chunk的话握手顺序会是这样:<br/><br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/RTMP-HandShake.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/RTMP-HandShake.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/><br/>理论上来讲只要满足以上条件,如何安排6个Message的顺序都是可以的,但实际实现中为了在保证握手的身份验证功能的基础上尽量减少通信的次数,一般的发送顺序是这样的,这一点可以通过wireshark抓ffmpeg推流包进行验证:<br/>|client|Server |<br/>|---C0+C1—->|<br/>|<--S0+S1+S2– |<br/>|---C2----> |<br/><br/><span style="line-height: 1.5; font-size: xx-small;"><strong>3. RTMP Chunk Stream</strong></span></p><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">Chunk Stream是对传输RTMP Chunk的流的逻辑上的抽象,客户端和服务器之间有关RTMP的信息都在这个流上通信。这个流上的操作也是我们关注RTMP协议的重点。</p><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="line-height: 1.5; font-size: xx-small;"><strong>3.1 Message(消息)</strong></span></p><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">这里的Message是指满足该协议格式的、可以切分成Chunk发送的消息,消息包含的字段如下:</p><ul style="margin-left: 30px; padding-left: 0px; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; font-size: 13px; white-space: normal; background-color: rgb(255, 255, 255);" class=" list-paddingleft-2"><li><p>Timestamp(时间戳):消息的时间戳(但不一定是当前时间,后面会介绍),4个字节</p></li><li><p>Length(长度):是指Message Payload(消息负载)即音视频等信息的数据的长度,3个字节</p></li><li><p>TypeId(类型Id):消息的类型Id,1个字节</p></li><li><p style="line-height: 1.5; margin: 10px auto;">Message Stream ID(消息的流ID):每个消息的唯一标识,划分成Chunk和还原Chunk为Message的时候都是根据这个ID来辨识是否是同一个消息的Chunk的,4个字节,并且以小端格式存储</p><p><span style="line-height: 1.5; font-size: xx-small;"><strong>3.2 Chunking(Message分块)</strong></span></p><p style="line-height: 1.5; margin: 10px auto;">RTMP在收发数据的时候并不是以Message为单位的,而是把Message拆分成Chunk发送,而且必须在一个Chunk发送完成之后才能开始发送下一个Chunk。每个Chunk中带有MessageID代表属于哪个Message,接受端也会按照这个id来将chunk组装成Message。<br/>为什么RTMP要将Message拆分成不同的Chunk呢?通过拆分,数据量较大的Message可以被拆分成较小的“Message”,这样就可以避免优先级低的消息持续发送阻塞优先级高的数据,比如在视频的传输过程中,会包括视频帧,音频帧和RTMP控制信息,如果持续发送音频数据或者控制数据的话可能就会造成视频帧的阻塞,然后就会造成看视频时最烦人的卡顿现象。同时对于数据量较小的Message,可以通过对Chunk Header的字段来压缩信息,从而减少信息的传输量。(具体的压缩方式会在后面介绍)<br/>Chunk的默认大小是128字节,在传输过程中,通过一个叫做Set Chunk Size的控制信息可以设置Chunk数据量的最大值,在发送端和接受端会各自维护一个Chunk Size,可以分别设置这个值来改变自己这一方发送的Chunk的最大大小。大一点的Chunk减少了计算每个chunk的时间从而减少了CPU的占用率,但是它会占用更多的时间在发送上,尤其是在低带宽的网络情况下,很可能会阻塞后面更重要信息的传输。小一点的Chunk可以减少这种阻塞问题,但小的Chunk会引入过多额外的信息(Chunk中的Header),少量多次的传输也可能会造成发送的间断导致不能充分利用高带宽的优势,因此并不适合在高比特率的流中传输。在实际发送时应对要发送的数据用不同的Chunk Size去尝试,通过抓包分析等手段得出合适的Chunk大小,并且在传输过程中可以根据当前的带宽信息和实际信息的大小动态调整Chunk的大小,从而尽量提高CPU的利用率并减少信息的阻塞机率。<br/><span style="line-height: 1.5; font-size: xx-small;"><strong>3.3 Chunk Format(块格式)</strong></span><br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/QQ20160228-0@2x.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/QQ20160228-0@2x.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/><strong>3.3.1 Basic Header(基本的头信息)</strong>:<br/>包含了chunk stream ID(流通道Id)和chunk type(chunk的类型),chunk stream id一般被简写为CSID,用来唯一标识一个特定的流通道,chunk type决定了后面Message Header的格式。Basic Header的长度可能是1,2,或3个字节,其中chunk type的长度是固定的(占2位,注意单位是位,bit),Basic Header的长度取决于CSID的大小,在足够存储这两个字段的前提下最好用尽量少的字节从而减少由于引入Header增加的数据量。<br/>RTMP协议支持用户自定义[3,65599]之间的CSID,0,1,2由协议保留表示特殊信息。0代表Basic Header总共要占用2个字节,CSID在[64,319]之间,1代表占用3个字节,CSID在[64,65599]之间,2代表该chunk是控制信息和一些命令信息,后面会有详细的介绍。<br/>chunk type的长度固定为2位,因此CSID的长度是(6=8-2)、(14=16-2)、(22=24-2)中的一个。<br/>当Basic Header为1个字节时,CSID占6位,6位最多可以表示64个数,因此这种情况下CSID在[0,63]之间,其中用户可自定义的范围为[3,63]。<br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/chunk-basicheader1.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/chunk-basicheader1.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/>当Basic Header为2个字节时,CSID占14位,此时协议将与chunk type所在字节的其他位都置为0,剩下的一个字节来表示CSID-64,这样共有8个二进制位来存储CSID,8位可以表示[0,255]共256个数,因此这种情况下CSID在[64,319],其中319=255+64。<br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/chunk-basicheader2.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/chunk-basicheader2.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/>当Basic Header为3个字节时,CSID占22位,此时协议将[2,8]字节置为1,余下的16个字节表示CSID-64,这样共有16个位来存储CSID,16位可以表示[0,65535]共65536个数,因此这种情况下CSID在[64,65599],其中65599=65535+64,<strong>需要注意的是,Basic Header是采用小端存储的方式,越往后的字节数量级越高,因此通过这3个字节每一位的值来计算CSID时,应该是:<第三个字节的值>x256+<第二个字节的值>+64<!--第二个字节的值--><!--第三个字节的值--><!--第二个字节的值--><!--第三个字节的值--><!--第二个字节的值--><!--第三个字节的值--></strong><br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/chunk-basicheader2.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/chunk-basicheader2.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/>可以看到2个字节和3个字节的Basic Header所能表示的CSID是有交集的[64,319],但实际实现时还是应该秉着最少字节的原则使用2个字节的表示方式来表示[64,319]的CSID。</p><p style="line-height: 1.5; margin: 10px auto;"><strong>3.3.2 Message Header(消息的头信息)</strong>:<br/>包含了要发送的实际信息(可能是完整的,也可能是一部分)的描述信息。Message Header的格式和长度取决于Basic Header的chunk type,共有4种不同的格式,由上面所提到的Basic Header中的fmt字段控制。其中第一种格式可以表示其他三种表示的所有数据,但由于其他三种格式是基于对之前chunk的差量化的表示,因此可以更简洁地表示相同的数据,实际使用的时候还是应该采用尽量少的字节表示相同意义的数据。以下按照字节数从多到少的顺序分别介绍这4种格式的Message Header。<br/><strong>Type=0:</strong><br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/chunk-messageheader0.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/chunk-messageheader0.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/>type=0时Message Header占用11个字节,其他三种能表示的数据它都能表示,但在chunk stream的开始的第一个chunk和头信息中的时间戳后退(即值与上一个chunk相比减小,通常在回退播放的时候会出现这种情况)的时候必须采用这种格式。</p></li><ul style="list-style-type: square;" class=" list-paddingleft-2"><li><p><strong>Set Chunk Size(Message Type ID=1):</strong>设置chunk中Data字段所能承载的最大字节数,默认为128B,通信过程中可以通过发送该消息来设置chunk Size的大小(不得小于128B),而且通信双方会各自维护一个chunkSize,两端的chunkSize是独立的。比如当A想向B发送一个200B的Message,但默认的chunkSize是128B,因此就要将该消息拆分为Data分别为128B和72B的两个chunk发送,如果此时先发送一个设置chunkSize为256B的消息,再发送Data为200B的chunk,本地不再划分Message,B接受到Set Chunk Size的协议控制消息时会调整的接受的chunk的Data的大小,也不用再将两个chunk组成为一个Message。<br/>以下为代表Set Chunk Size消息的chunk的Data:<br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/set-chunksize.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/set-chunksize.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/>其中第一位必须为0,chunk Size占31个位,最大可代表2147483647=0x7FFFFFFF=231-1,但实际上所有大于16777215=0xFFFFFF的值都用不上,因为chunk size不能大于Message的长度,表示Message的长度字段是用3个字节表示的,最大只能为0xFFFFFF。</p></li><li><p><strong>Abort Message(Message Type ID=2)</strong>:当一个Message被切分为多个chunk,接受端只接收到了部分chunk时,发送该控制消息表示发送端不再传输同Message的chunk,接受端接收到这个消息后要丢弃这些不完整的chunk。Data数据中只需要一个CSID,表示丢弃该CSID的所有已接收到的chunk。<br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/abort%EF%BC%8Dmessage.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/abort%EF%BC%8Dmessage.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a></p></li><li><p><strong>Acknowledgement(Message Type ID=3):</strong>当收到对端的消息大小等于窗口大小(Window Size)时接受端要回馈一个ACK给发送端告知对方可以继续发送数据。窗口大小就是指收到接受端返回的ACK前最多可以发送的字节数量,返回的ACK中会带有从发送上一个ACK后接收到的字节数。<br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/ACK-message.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/ACK-message.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a></p></li><li><p><strong>Window Acknowledgement Size(Message Type ID=5):</strong>发送端在接收到接受端返回的两个ACK间最多可以发送的字节数。<br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/ACK-windowsize.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/ACK-windowsize.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a></p></li><li><p><strong>Set Peer Bandwidth(Message Type ID=6):</strong>限制对端的输出带宽。接受端接收到该消息后会通过设置消息中的Window ACK Size来限制已发送但未接受到反馈的消息的大小来限制发送端的发送带宽。如果消息中的Window ACK Size与上一次发送给发送端的size不同的话要回馈一个Window Acknowledgement Size的控制消息。<br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/Peer-Bandwidth.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/Peer-Bandwidth.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a></p></li><li><p>Hard(Limit Type=0):接受端应该将Window Ack Size设置为消息中的值</p></li><li><p>Soft(Limit Type=1):接受端可以讲Window Ack Size设为消息中的值,也可以保存原来的值(前提是原来的Size小与该控制消息中的Window Ack Size)</p></li><li><p>Dynamic(Limit Type=2):如果上次的Set Peer Bandwidth消息中的Limit Type为0,本次也按Hard处理,否则忽略本消息,不去设置Window Ack Size。</p></li><li><p>timestamp(时间戳):占用3个字节,因此它最多能表示到16777215=0xFFFFFF=2<br/>24-1, 当它的值超过这个最大值时,这三个字节都置为1,这样实际的timestamp会转存到Extended Timestamp字段中,接受端在判断timestamp字段24个位都为1时就会去Extended timestamp中解析实际的时间戳。</p></li><li><p>message length(消息数据的长度):占用3个字节,表示实际发送的消息的数据如音频帧、视频帧等数据的长度,单位是字节。注意这里是Message的长度,也就是chunk属于的Message的总数据长度,而不是chunk本身Data的数据的长度。</p></li><li><p>message type id(消息的类型id):占用1个字节,表示实际发送的数据的类型,如8代表音频数据、9代表视频数据。</p></li><li><p style="line-height: 1.5; margin: 10px auto;">msg stream id(消息的流id):占用4个字节,表示该chunk所在的流的ID,和Basic Header的CSID一样,它采用小端存储的方式,<br/><strong>Type = 1:</strong><br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/chunk-messageheader1.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/chunk-messageheader1.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/>type=1时Message Header占用7个字节,省去了表示msg stream id的4个字节,表示此chunk和上一次发的chunk所在的流相同,如果在发送端只和对端有一个流链接的时候可以尽量去采取这种格式。<br/>timestamp delta:占用3个字节,注意这里和type=0时不同,存储的是和上一个chunk的时间差。类似上面提到的timestamp,当它的值超过3个字节所能表示的最大值时,三个字节都置为1,实际的时间戳差值就会转存到Extended Timestamp字段中,接受端在判断timestamp delta字段24个位都为1时就会去Extended timestamp中解析时机的与上次时间戳的差值。<br/><strong>Type = 2:</strong><br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/chunk-messageheader2.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/chunk-messageheader2.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/>type=2时Message Header占用3个字节,相对于type=1格式又省去了表示消息长度的3个字节和表示消息类型的1个字节,表示此chunk和上一次发送的chunk所在的流、消息的长度和消息的类型都相同。余下的这三个字节表示timestamp delta,使用同type=1<br/><strong>Type = 3</strong><br/>0字节!!!好吧,它表示这个chunk的Message Header和上一个是完全相同的,自然就不用再传输一遍了。当它跟在Type=0的chunk后面时,表示和前一个chunk的时间戳都是相同的。什么时候连时间戳都相同呢?就是一个Message拆分成了多个chunk,这个chunk和上一个chunk同属于一个Message。而当它跟在Type=1或者Type=2的chunk后面时,表示和前一个chunk的时间戳的差是相同的。比如第一个chunk的Type=0,timestamp=100,第二个chunk的Type=2,timestamp delta=20,表示时间戳为100+20=120,第三个chunk的Type=3,表示timestamp delta=20,时间戳为120+20=140<br/><strong>3.3.3 Extended Timestamp(扩展时间戳)</strong>:<br/>上面我们提到在chunk中会有时间戳timestamp和时间戳差timestamp delta,并且它们不会同时存在,只有这两者之一大于3个字节能表示的最大数值0xFFFFFF=16777215时,才会用这个字段来表示真正的时间戳,否则这个字段为0。扩展时间戳占4个字节,能表示的最大数值就是0xFFFFFFFF=4294967295。当扩展时间戳启用时,timestamp字段或者timestamp delta要全置为1,表示应该去扩展时间戳字段来提取真正的时间戳或者时间戳差。注意扩展时间戳存储的是完整值,而不是减去时间戳或者时间戳差的值。<br/><strong>3.3.4 Chunk Data(块数据)</strong>:<br/>用户层面上真正想要发送的与协议无关的数据,长度在(0,chunkSize]之间。<br/><strong>3.3.5 chunk表示例1</strong><br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/sample-chunk1.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/sample-chunk1.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/>首先包含第一个Message的chunk的Chunk Type为0,因为它没有前面可参考的chunk,timestamp为1000,表示时间戳。type为0的header占用11个字节,假定chunkstreamId为3<127,因此Basic Header占用1个字节,再加上Data的32个字节,因此第一个chunk共44=11+1+32个字节。<br/>第二个chunk和第一个chunk的CSID,TypeId,Data的长度都相同,因此采用Chunk Type=2,timestamp delta=1020-1000=20,因此第二个chunk占用36=3+1+32个字节。<br/>第三个chunk和第二个chunk的CSID,TypeId,Data的长度和时间戳差都相同,因此采用Chunk Type=3省去全部Message Header的信息,占用33=1+32个字节。<br/>第四个chunk和第三个chunk情况相同,也占用33=1+32个字节。<br/>最后实际发送的chunk如下:<br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/sample-chunk1-result.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/sample-chunk1-result.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a></p><p style="line-height: 1.5; margin: 10px auto;"><strong>3.3.6 chunk表示例2</strong><br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/sample-chunk2.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/sample-chunk2.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/>注意到Data的Length=307>128,因此这个Message要切分成几个chunk发送,第一个chunk的Type=0,Timestamp=1000,承担128个字节的Data,因此共占用140=11+1+128个字节。<br/>第二个chunk也要发送128个字节,其他字段也同第一个chunk,因此采用Chunk Type=3,此时时间戳也为1000,共占用129=1+128个字节。<br/>第三个chunk要发送的Data的长度为307-128-128=51个字节,还是采用Type=3,共占用1+51=52个字节。<br/>最后实际发送的chunk如下:<br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/sample-chunk2-result.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/sample-chunk2-result.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/><span style="line-height: 1.5; font-size: xx-small;"><strong>3.4 协议控制消息(Protocol Control Message)</strong></span><br/>在RTMP的chunk流会用一些特殊的值来代表协议的控制消息,它们的Message Stream ID必须为0(代表控制流信息),CSID必须为2,Message Type ID可以为1,2,3,5,6,具体代表的消息会在下面依次说明。控制消息的接受端会忽略掉chunk中的时间戳,收到后立即生效。</p></li></ul></ul><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4. 不同类型的RTMP Message</strong></p><ul style="margin-left: 30px; padding-left: 0px; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; font-size: 13px; white-space: normal; background-color: rgb(255, 255, 255);" class=" list-paddingleft-2"><li><p>Command Message(命令消息,Message Type ID=17或20):表示在客户端盒服务器间传递的在对端执行某些操作的命令消息,如connect表示连接对端,对端如果同意连接的话会记录发送端信息并返回连接成功消息,publish表示开始向对方推流,接受端接到命令后准备好接受对端发送的流信息,后面会对比较常见的Command Message具体介绍。当信息使用AMF0编码时,Message Type ID=20,AMF3编码时Message Type ID=17.</p></li><li><p>Data Message(数据消息,Message Type ID=15或18):传递一些元数据(MetaData,比如视频名,分辨率等等)或者用户自定义的一些消息。当信息使用AMF0编码时,Message Type ID=18,AMF3编码时Message Type ID=15.</p></li><li><p>Shared Object Message(共享消息,Message Type ID=16或19):表示一个Flash类型的对象,由键值对的集合组成,用于多客户端,多实例时使用。当信息使用AMF0编码时,Message Type ID=19,AMF3编码时Message Type ID=16.</p></li><li><p>Audio Message(音频信息,Message Type ID=8):音频数据。</p></li><li><p>Video Message(视频信息,Message Type ID=9):视频数据。</p></li><li><p>Aggregate Message (聚集信息,Message Type ID=22):多个RTMP子消息的集合</p></li><li><p>User Control Message Events(用户控制消息,Message Type ID=4):告知对方执行该信息中包含的用户控制事件,比如Stream Begin事件告知对方流信息开始传输。和前面提到的协议控制信息(Protocol Control Message)不同,这是在RTMP协议层的,而不是在RTMP chunk流协议层的,这个很容易弄混。该信息在chunk流中发送时,Message Stream ID=0,Chunk Stream Id=2,Message Type Id=4。<br/>———<strong>下面对以上7种信息具体介绍</strong>———-<br/><strong>4.1 Command Message(命令消息,Message Type ID=17或20)</strong><br/>发送端发送时会带有命令的名字,如connect,TransactionID表示此次命令的标识,Command Object表示相关参数。接受端收到命令后,会返回以下三种消息中的一种:_result 消息表示接受该命令,对端可以继续往下执行流程,_error消息代表拒绝该命令要执行的操作,method name消息代表要在之前命令的发送端执行的函数名称。这三种回应的消息都要带有收到的命令消息中的TransactionId来表示本次的回应作用于哪个命令。<br/>可以认为发送命令消息的对象有两种,一种是NetConnection,表示双端的上层连接,一种是NetStream,表示流信息的传输通道,控制流信息的状态,如Play播放流,Pause暂停。<br/><strong>4.1.1 NetConnection Commands(连接层的命令)</strong><br/>用来管理双端之间的连接状态,同时也提供了异步远程方法调用(RPC)在对端执行某方法,以下是常见的连接层的命令:<br/><strong>4.1.1.1 connect</strong>:用于客户端向服务器发送连接请求,消息的结构如下:</p></li></ul><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Name(命令名字)</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">命令的名字,如”connect”</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Transaction ID(事务ID)</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">恒为1</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object(命令包含的参数对象)</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">键值对集合表示的命令参数</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Optional User Arguments(额外的用户参数)</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">用户自定义的额外信息</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">第三个字段中的Command Object中会涉及到很多键值对,这里不再一一列出,使用时可以参考协议的官方文档。<br/>消息的回应有两种,_result表示接受连接,_error表示连接失败</p><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4.1.1.2 Call</strong>:用于在对端执行某函数,即常说的RPC:远程进程调用,消息的结构如下:</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Procedure Name(进程名)</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">要调用的进程名称</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Transaction ID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number|如果想要对端响应的话置为非0值,否则置为0</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;"><br/></td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">命令参数</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Optional Arguents</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">用户自定义参数</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">如果消息中的TransactionID不为0的话,对端需要对该命令做出响应,响应的消息结构如下:</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Name(命令名)</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">命令的名称</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">TransactionID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">上面接收到的命令消息中的TransactionID</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">命令参数</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Optional Arguments</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">用户自定义参数</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4.1.1.3 Create Stream</strong>:创建传递具体信息的通道,从而可以在这个流中传递具体信息,传输信息单元为Chunk。</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Name(命令名)</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">“createStream”</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">TransactionID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">上面接收到的命令消息中的TransactionID</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">命令参数</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Optional Arguments</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">用户自定义参数</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4.1.2 NetStream Commands(流连接上的命令)</strong></p><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">Netstream建立在NetConnection之上,通过NetConnection的createStream命令创建,用于传输具体的音频、视频等信息。在传输层协议之上只能连接一个NetConnection,但一个NetConnection可以建立多个NetStream来建立不同的流通道传输数据。<br/>以下会列出一些常用的NetStream Commands,服务端收到命令后会通过onStatus的命令来响应客户端,表示当前NetStream的状态。<br/>onStatus命令的消息结构如下:</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Name</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">“onStatus”</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">TransactionID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">恒为0</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">NULL</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">对onSatus命令来说不需要这个字段</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Info Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">AMF类型的Object,至少包含以下三个属性:1,“level”,String类型,可以为“warning”、”status”、”error”中的一种;2,”code”,String类型,代表具体状态的关键字,比如”NetStream.Play.Start”表示开始播流;3,”description”,String类型,代表对当前状态的描述,提供对当前状态可读性更好的解释,除了这三种必要信息,用户还可以自己增加自定义的键值对</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4.1.2.1 play(播放):</strong>由客户端向服务器发起请求从服务器端接受数据(如果传输的信息是视频的话就是请求开始播流),可以多次调用,这样本地就会形成一组数据流的接收者。注意其中有一个reset字段,表示是覆盖之前的播流(设为true)还是重新开始一路播放(设为false)。<br/>play命令的结构如下:</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">命令名</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">“play”</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">事务ID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">恒为0</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">命令参数对象</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Null</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">不需要此字段,设为空</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">流名称</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">要播放的流的名称</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">开始位置</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">可选参数,表示从何时开始播流,以秒为单位。默认为-2,代表选取对应该流名称的直播流,即当前正在推送的流开始播放,如果对应该名称的直播流不存在,就选取该名称的流的录播版本,如果这也没有,当前播流端要等待直到对端开始该名称的流的直播。如果传值-1,那么只会选取直播流进行播放,即使有录播流也不会播放;如果传值或者正数,就代表从该流的该时间点开始播放,如果流不存在的话就会自动播放播放列表中的下一个流</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">周期</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">可选参数,表示回退的最小间隔单位,以秒为单位计数。默认值为-1,代表直到直播流不再可用或者录播流停止后才能回退播放;如果传值为0,代表从当前帧开始播放</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">重置</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Boolean</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">可选参数,true代表清除之前的流,重新开始一路播放,false代表保留原来的流,向本地的播放列表中再添加一条播放流</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4.1.2.2 play2(播放):</strong>和上面的play命令不同的是,play2命令可以将当前正在播放的流切换到同样数据但不同比特率的流上,服务器端会维护多种比特率的文件来供客户端使用play2命令来切换。</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Name</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">“play2”</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">TransactionID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">恒为0</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">NULL,对onSatus命令来说不需要这个字段</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;"><br/></td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">parameters</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">AMF编码的Flash对象,包括了一些用于描述flash.net.NetstreamPlayOptions ActionScript obejct的参数</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4.1.2.3 deleteStream(删除流):</strong>用于客户端告知服务器端本地的某个流对象已被删除,不需要再传输此路流。</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Name</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">“deleteStream”</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">TransactionID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">恒为0</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">NULL,对onSatus命令来说不需要这个字段</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;"><br/></td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Stream ID(流ID)</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">本地已删除,不再需要服务器传输的流的ID</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4.1.2.4 receiveAudio(接收音频):</strong>通知服务器端该客户端是否要发送音频<br/>receiveAudio命令结构如下:</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Name</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">“receiveAudio”</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">TransactionID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">恒为0</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">NULL</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">对onSatus命令来说不需要这个字段</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Bool Flag</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Boolean</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">true表示发送音频,如果该值为false,服务器端不做响应,如果为true的话,服务器端就会准备接受音频数据,会向客户端回复NetStream.Seek.Notify和NetStream.Play.Start的Onstatus命令告知客户端当前流的状态</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4.1.2.5 receiveVideo(接收视频):</strong>通知服务器端该客户端是否要发送视频<br/>receiveVideo命令结构如下:</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Name</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">“receiveVideo”</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">TransactionID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">恒为0</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">NULL</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">对onSatus命令来说不需要这个字段</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Bool Flag</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Boolean</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">true表示发送视频,如果该值为false,服务器端不做响应,如果为true的话,服务器端就会准备接受视频数据,会向客户端回复NetStream.Seek.Notify和NetStream.Play.Start的Onstatus命令告知客户端当前流的状态</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4.1.2.6 publish(推送数据):</strong>由客户端向服务器发起请求推流到服务器。<br/>publish命令结构如下:</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Name</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">“publish”</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">TransactionID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">恒为0</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">NULL,对onSatus命令来说不需要这个字段</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;"><br/></td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Publishing Name(推流的名称)</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">流名称|</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Publishing Type(推流类型)</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">“live”、”record”、”append”中的一种。live表示该推流文件不会在服务器端存储;record表示该推流的文件会在服务器应用程序下的子目录下保存以便后续播放,如果文件已经存在的话删除原来所有的内容重新写入;append也会将推流数据保存在服务器端,如果文件不存在的话就会建立一个新文件写入,如果对应该流的文件已经存在的话保存原来的数据,在文件末尾接着写入</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4.1.2.7 seek(定位流的位置):</strong>定位到视频或音频的某个位置,以毫秒为单位。<br/>seek命令的结构如下:</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Name</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">“seek”</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">TransactionID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">恒为0</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">NULL,对onSatus命令来说不需要这个字段</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;"><br/></td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">milliSeconds</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">定位到该文件的xx毫秒处|</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><strong>4.1.2.8 pause(暂停):</strong>客户端告知服务端停止或恢复播放。<br/>pause命令的结构如下:</p><table><thead><tr class="firstRow"><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">字段</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">类型</th><th style="background-color: rgb(250, 250, 250); border-color: silver; border-collapse: collapse; padding: 8px 14px;">说明</th></tr></thead><tbody><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Name</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">String</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">“pause”</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">TransactionID</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">恒为0</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Command Object</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">NULL,对onSatus命令来说不需要这个字段</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;"><br/></td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Pause/Unpause Flag</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Boolean</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">true表示暂停,false表示恢复</td></tr><tr><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">milliSeconds</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">Number</td><td style="font-size: 12px; border-color: silver; border-collapse: collapse; padding: 8px 14px;">暂停或者恢复的时间,以毫秒为单位|</td></tr></tbody></table><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">如果Pause为true即表示客户端请求暂停的话,服务端暂停对应的流会返回NetStream.Pause.Notify的onStatus命令来告知客户端当前流处于暂停的状态,当Pause为false时,服务端会返回NetStream.Unpause.Notify的命令来告知客户端当前流恢复。如果服务端对该命令响应失败,返回_error信息。</p><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="line-height: 1.5; font-size: xx-small;"><strong>5. 代表流程</strong></span><br/><strong>5.1 推流流程</strong><br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/publish-flow.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/publish-flow.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/><br/><strong>5.2 播流流程</strong><br/><a class="fancy-ctn fancybox" title="" href="http://7xpoty.com1.z0.glb.clouddn.com/play-flow.png" rel="fancy-group" style="color: navy; text-decoration-line: none;"><img title="" src="http://7xpoty.com1.z0.glb.clouddn.com/play-flow.png" alt="" style="border: 0px; max-width: 900px; height: auto;"/></a><br/><br/><span style="line-height: 1.5; font-size: xx-small;"><strong>6. 新手建议</strong></span></p><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">如果读者仔细读完了上面讲的RTMP协议,想必会觉得RTMP协议非常繁琐,事实也确实是这样,RTMP协议中充斥着很多冗余的字段,比如三次握手中的时间戳的校对,还有一些特殊的命令,如FCPublish、UnFCPublish等,但在实际实现中为了保证更大兼容性通常还是要处理这些看似多余的命令。加上Adobe对RTMP协议的实现细节有些并没有按照协议来或者协议中没有写清楚自己搞了一套实现,其他应用开发时还要兼容Adobe错误的实现,从而使的RTMP也一直为开发者所诟病。但不管怎样,RTMP确实提供了一种能够全面并且实现简单的协议来保证流信息的传输,这方面暂时还没有一种更完善更简洁的协议能够取代它在视频流开发中的地位。<br/>新人一开始接触RTMP的时候肯定会觉得头大,这也是RTMP协议不简洁的后果。建议读者在学习时先过一遍协议理解大概的概念和流程,然后对照wireshark抓的包,和协议进行比对,这样将理论和实践结合,应该会理解的更快一点。</p><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"> </p><p style="font-size: 13px; line-height: 1.5; margin: 10px auto; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">from:http://mingyangshang.github.io/2016/03/06/RTMP协议/</p><p><br/></p><p><br/></p><p><br/></p>
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