{"id":938,"date":"2022-02-25T22:45:15","date_gmt":"2022-02-25T14:45:15","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=938"},"modified":"2022-06-11T02:44:10","modified_gmt":"2022-06-10T18:44:10","slug":"rtmp%e5%8d%8f%e8%ae%ae%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=938","title":{"rendered":"RTMP\u534f\u8bae\u5206\u6790-chunk\u683c\u5f0f"},"content":{"rendered":"\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u524d\u6587<a href=\"https:\/\/www.xianwaizhiyin.net\/?p=933\">\u300a\u4e3a\u4ec0\u4e48\u8981\u8bbe\u8ba1chunk\u5206\u7247\u300b<\/a> \u8bb2\u89e3\u4e86 \u5207\u7247 chunk \u7684\u597d\u5904\uff0c\u6240\u4ee5 \u5bf9\u4e8e RTMP \u534f\u8bae\u6765\u8bf4\uff0c\u4ed6\u7684 \u4f20\u8f93\u5355\u5143\u662f chunk\u3002\u4e00\u4e2a RTMP \u5305\u5c31\u662f\u4e00\u4e2a chunk\u3002\u6240\u4ee5 chunk \u7684\u683c\u5f0f\uff0c\u4e5f\u5c31\u662f RTMP \u62a5\u6587\u7684\u683c\u5f0f\u3002<\/p>\n\n\n\n<p>chunk \u7684\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"721\" height=\"232\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/02\/chunk-format-1-1.png\" alt=\"\" class=\"wp-image-942\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230 Chunk Header \u7531 3 \u90e8\u5206\u7ec4\u6210\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Basic Header<\/li><li>Message Header<\/li><li>Extended Timestamp<\/li><\/ol>\n\n\n\n<p>\u5148\u6765 \u8bb2\u89e3 <code class=\"prettyprint\" >Basic Header<\/code> \u7684\u683c\u5f0f\uff0c<code>Basic Header<\/code> \u7531 <code>fmt<\/code> + <code>chunk stream id<\/code> \u7ec4\u6210\uff0cfmt \uff08\u4e5f\u53eb chunk type\uff09\u56fa\u5b9a\u662f 2 \u4f4d\u3002\u4f46\u662f <code>cs id<\/code> \u53ef\u4ee5\u662f 6\u4f4d\uff0c\u4e5f\u53ef\u4ee5\u662f 14 \u4f4d\uff0c\u4e5f\u53ef\u4ee5\u662f 22 \u4f4d\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5 Basic Header \u53ef\u4ee5\u662f 1\u4e2a \u5b57\u8282\uff0c\u4e5f\u53ef\u4ee5\u662f2\u4e2a\u5b57\u8282\u6216\u8005 3\u4e2a\u5b57\u8282\uff0c\u8fd9\u91cc\u4e0d\u592a\u597d\u61c2\u4ed6\u7684\u53d8\u957f\u662f\u5982\u4f55\u5b9e\u73b0\u7684\u3002\u6211\u8be6\u7ec6\u8bb2\u4e00\u4e0b\u3002<\/p>\n\n\n\n<p>Basic Header \u5360\u4e00\u4e2a\u5b57\u8282\u7684\u60c5\u51b5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"210\" height=\"123\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/02\/chunk-format-1-2.png\" alt=\"\" class=\"wp-image-943\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230 \u524d\u9762 2\u4f4d \u662f <code class=\"prettyprint\" >fmt<\/code> \uff0c\u8fd9\u4e2a\u5b57\u6bb5\u4e3b\u8981\u7528\u5728\u540e\u9762\uff0c\u6682\u65f6\u4e0d\u8bb2\u3002\u7136\u540e\u8fd8\u5269 6 \u4f4d\u7a7a\u95f4\u6ca1\u7528\uff0c\u6240\u4ee5 cs id \u7684\u8303\u56f4\u5e94\u8be5\u662f 0 ~ (2^6 - 1) \uff0c\u4e5f\u5c31\u662f 0 ~ 63 \u3002\u4f46\u662f\u56e0\u4e3a\u8981\u5b9e\u73b0\u53d8\u957f\u6570\u636e\uff0c\u6240\u4ee5\u4e0d\u80fd \u76f4\u63a5\u662f\u7528 0~ 63\uff0c\u8981\u9884\u7559 \u4e00\u4e9b\u503c\u4f5c\u4e3a\u6807\u8bb0\u30020~2 \u5c31\u662f\u6807\u8bb0\uff0c\u4e5f\u5c31\u662f\u8bf4 \u8fd9 6\u4f4d\u7684\u6570\u636e\u4e0d\u80fd\u662f 0 \u52302\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5 Basic Header \u662f 1\u4e2a\u5b57\u8282\u7684\u60c5\u51b5\u4e0b\uff0c<code class=\"prettyprint\" >3 ~ 63<\/code> \u624d\u662f cs id \u7684\u53d6\u503c\u8303\u56f4\u3002<\/p>\n\n\n\n<p>\u63a5\u4e0b\u6765\u8bb2\u89e3 0 ~ 2 \u662f\u600e\u4e48\u5904\u7406\u7684\u3002<\/p>\n\n\n\n<p>1\uff0c\u7b2c\u4e00\u4e2a\u5b57\u8282\u7684\u540e6\u4f4d \u5982\u679c\u662f 000000\uff0c\u8bf4\u660e\u540e\u9762\u8fd8\u6709\u4e00\u4e2a\u5b57\u8282\uff0c\u5c31\u8bfb\u53d6\u540e\u9762\u7684\u4e00\u4e2a\u5b57\u8282\uff0c\u4e00\u4e2a\u5b57\u8282\u6700\u591a\u662f 2^8 = 256 \uff0c\u90a3\u662f\u4e0d\u662f\u8bf4\uff0c2\u5b57\u8282\u7684 \u60c5\u51b5\u4e0b cs id \u7684\u8303\u56f4 \u662f 0 ~ (2^8 - 1) \uff0c\u4e5f\u5c31\u662f 0 ~ 255\u3002\u4e0d\u662f\uff0c\u4e0d\u80fd\u8fd9\u6837\u7b97\uff0c\u56e0\u4e3a\u662f\u4e4b\u524d\u4e00\u4e2a\u5b57\u8282\u4e0d\u591f\u7528 \u624d\u6269\u5c55\u52302\u4e2a\u5b57\u8282\uff0c\u6240\u7b2c\u4e8c\u4e2a\u5b57\u8282\u7684\u8d77\u59cb\u503c\u662f64\uff0c\u4e0d\u662f\u4ece0\u5f00\u59cb\uff0c\u6240\u4ee5 cs id \u7684\u8303\u56f4 \u662f 64 ~ 255 + 64\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5 Basic Header \u662f 2\u4e2a\u5b57\u8282\u60c5\u51b5\u4e0b\uff0c<code class=\"prettyprint\" >cs id<\/code> \u7684\u8303\u56f4\u662f 64 ~319\uff0c <code>cs id<\/code> \u4e0d\u4f1a\u662f 64 \u4ee5\u4e0b\u7684\u503c\uff0c\u56e0\u4e3a\u90a3\u662f\u4e00\u4e2a\u5b57\u8282\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n<p>2\uff0c\u7b2c\u4e00\u4e2a\u5b57\u8282\u7684\u540e6\u4f4d \u5982\u679c\u662f 000001\uff0c\u4ee3\u8868\u540e\u9762\u8fd8\u67092\u4e2a\u5b57\u8282\uff0c\u4e24\u4e2a\u5b57\u8282\u80fd\u8868\u793a 0 ~ 65535\uff0c\u4f46\u662f\u8d77\u59cb\u503c\u662f64\uff0c\u6240\u4ee5 cs id \u7684\u8303\u56f4 \u662f 64 ~ 65535 + 64\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5 Basic Header \u662f 3\u4e2a\u5b57\u8282\u60c5\u51b5\u4e0b\uff0c<code class=\"prettyprint\" >cs id<\/code> \u7684\u8303\u56f4\u662f 64 ~ 65599\uff0c\u540c\u65f6 <code>cs id<\/code> \u4e0d\u4f1a\u662f 319 \u4ee5\u4e0b\u7684\u503c\uff0c\u56e0\u4e3a\u90a3\u662f\u4e24\u4e2a\u5b57\u8282\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n<p>\u7ea0\u6b63\uff1a3\u4e2a\u5b57\u8282\u60c5\u51b5\u4e0b <code class=\"prettyprint\" >cs id<\/code> \u53ef\u80fd\u662f 319 \u4ee5\u4e0b\u7684\u503c\uff0c\u53ea\u662fRTMP \u6807\u51c6\u8bf4\u5c3d\u91cf\u7528\u66f4\u5c11\u7684\u5b57\u8282\u3002319\u4ee5\u4e0b\u7684\u503c\u4e5f\u53ef\u4ee5\u75283\u5b57\u8282\u8868\u793a\uff0c\u53ea\u4e0d\u8fc7\u6ca1\u5fc5\u8981\u3002<\/p>\n\n\n\n<p>3\uff0c\u7b2c\u4e00\u4e2a\u5b57\u8282\u7684\u540e6\u4f4d \u5982\u679c\u662f 000002\uff0c\u4ee3\u8868\u8fd9\u4e2aRTMP \u5305\u662f\u4e00\u4e2a Protocol Control Messages\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u63a5\u4e0b\u6765\u5206\u6790 <code class=\"prettyprint\" >Message Header<\/code>\uff0c\u7531\u4e8e <code>Message Header<\/code> \u53d7\u5230 <code>Basic Header<\/code> \u7684 fmt \u5b57\u6bb5\u5f71\u54cd\uff0cfmt \u5360 2\u4f4d\uff0c\u6240\u4ee5 \u6709 4 \u79cd <code>Message Header<\/code> \u3002<\/p>\n\n\n\n<p>Message Header \u770b\u6807\u51c6\u6587\u6863\u8ddf \u8fd9\u7bc7\u6587\u7ae0 <a href=\"https:\/\/www.jianshu.com\/p\/b2d02d9d92eb\">\u300artmp\u534f\u8bae\u8be6\u89e3\u300b<\/a> \u5c31\u884c\uff0c\u8bb2\u5f97\u5f88\u8be6\u7ec6\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>Chunk header \u5df2\u7ecf\u8bb2\u89e3\u5b8c\u6bd5\uff0c\u8fd8\u6709\u4e24\u4e2a \u91cd\u70b9 \u6ca1\u6709\u8bb2\u89e3\u3002<\/p>\n\n\n\n<p>1\uff0cchunk stream id \u662f\u4ec0\u4e48\u4e1c\u897f\uff1f<\/p>\n\n\n\n<p>chunk stream id \u7f29\u5199\u662f <code class=\"prettyprint\" >cs id<\/code>\uff0c\u4e5f\u5c31\u662f RTMP \u5305\u5f00\u5934\u7684 1~3\u4e2a\u5b57\u8282\u90a3\u4e2a\u5730\u65b9\u7684\u6570\u636e\u3002\u8fd9\u4e2a <code>cs id<\/code> \u662f chunk \u6d41ID\uff0c\u6bcf\u4e2a TCP \u94fe\u63a5 \u53ef\u4ee5\u6709\u591a\u4e2a <code>cs id<\/code>\u3002 <code>cs id<\/code> \u8981\u7ed3\u5408 <code>message stream id<\/code> \u6765\u7406\u89e3\u3002<\/p>\n\n\n\n<p>2\uff0cmessage stream id \u662f\u4ec0\u4e48\u4e1c\u897f\u3002<\/p>\n\n\n\n<p>message stream id \u5c31\u662f\u6d88\u606f\u7684\u6d41ID\uff0c\u4f8b\u5982 \u97f3\u9891\u6d41\u7684 message stream id \u662f 1\uff0c\u89c6\u9891\u6d41\u7684 message stream id \u662f 2\u3002<\/p>\n\n\n\n<p>\u4f46\u662f \u89c6\u9891\u6d41\uff0c\u97f3\u9891\u6d41 \u5bf9\u5e94\u7684 <code class=\"prettyprint\" >cs id<\/code> \u53ef\u4ee5\u662f\u540c\u4e00\u4e2a\u3002\u8fd9\u5c31\u53eb\u591a\u8def\u590d\u7528\u3002\u591a\u4e2a\u6d41\u590d\u7528\u4e00\u4e2a\u6d41\u901a\u9053\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u63a5\u4e0b\u6765\u8bb2\u89e3\uff0c\u51e0\u79cd\u5e38\u7528\u7684 RTMP \u5305\uff0c\u62ec\u53f7() \u91cc\u9762\u7684\u503c\u662f message header \u91cc\u9762\u7684 type id \u3002<\/p>\n\n\n\n<p>1\uff0cSet Chunk Size (1)\uff1a\u901a\u77e5\u5bf9\u9762 \u81ea\u5df1\u4f1a\u6309\u7167 \u8fd9\u4e2a \u5927\u5c0f\u6765\u5207\u5206\u6570\u636e\u3002<\/p>\n\n\n\n<p>2\uff0cAbort Message (2)\uff1a\u4e2d\u65ad\uff0c\u5f88\u5c11\u4f7f\u7528\u3002<\/p>\n\n\n\n<p>3\uff0cWindow Acknowledgement Size (5)\uff1a\u544a\u8bc9\u53d1\u9001\u65b9\uff0c\u6211\u63a5\u53d7\u5230\u8fd9\u4e48\u591a\u7684\u6570\u636e\u4e4b\u540e\u5c31\u4f1a\u53d1 Acknowledgement (3) \u7684RTMP\u5305\u3002<\/p>\n\n\n\n<p>4\uff0cAcknowledgement (3) \uff1a\u786e\u8ba4\u5df2\u7ecf\u6536\u5230\u591a\u5c11\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u5b9e\u9645 Window Acknowledgement Size \u8ddf Acknowledgement \u975e\u5e38\u9e21\u808b\uff0c\u56e0\u4e3a TCP \u672c\u8eab\u6709\u6ed1\u52a8\u7a97\u53e3\u8ddfACK\u3002\u6240\u4ee5\u4e00\u822c Window Acknowledgement Size \u4f1a\u8bbe\u7f6e\u5f97\u975e\u5e38\u5927\u3002<\/p>\n\n\n\n<p>5\uff0cSet Peer Bandwidth (6)\uff1a\u5ba2\u6237\u7aef\u6216\u670d\u52a1\u7aef\u53d1\u9001\u8be5\u6d88\u606f\u6765\u9650\u5236\u5bf9\u7aef\u7684\u8f93\u51fa\u5e26\u5bbd\uff0c \u6807\u51c6\u6587\u6863\u91cc\u9762\u6ca1\u6709\u8bb2\u5f97\u5f88\u6e05\u695a\uff0c\u8fd9\u4e2a\u662f\u9650\u5236\u5e26\u5bbd\u662f\u600e\u4e48\u5b9e\u73b0\u4e86\uff0c\u7f51\u4e0a\u641c\u4e86\uff0c\u5927\u591a\u6570\u4e5f\u662f\u82f1\u6587\u7684\u76f4\u63a5\u7ffb\u8bd1\uff0c\u4e5f\u6ca1\u8bb2\u5f97\u7279\u522b\u6e05\u695a\uff0c\u8fd9\u4e2a\u903b\u8f91\u8981\u5728\u6e90\u7801\u91cc\u9762\u627e\uff0c\u5148\u57cb\u4e2a\u5751\uff0c\u540e\u7eed\u586b\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>RTMP \u91cc\u9762 \u7ecf\u5e38\u89c1\u5230\u7684\u4e00\u79cd\u5305 \u662f Action Message Format (AMF)\u3002\u770b\u540d\u5b57\u5c31\u77e5\u9053\uff0c\u8fd9\u662f\u4e00\u4e2a action \u5305\u3002\u8fd9\u79cd RTMP \u5305\u7684 message header \u91cc\u9762\u7684 type id \u662f 0x14<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c<code class=\"prettyprint\" >connect<\/code> \u5c31\u662f\u4e00\u4e2a AMF \u5305\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"776\" height=\"353\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/02\/chunk-format-1-3.png\" alt=\"\" class=\"wp-image-944\"\/><\/figure>\n\n\n\n<p><code class=\"prettyprint\" >releaseStream<\/code> \uff0c<code>FCPublish<\/code> \uff0c<code>createStream<\/code>\uff0c<code>_result<\/code> \u7b49\u7b49\u4e5f\u662f\u4e00\u4e2a AMF \u5305\uff0c\u4ed6\u4eec message header \u91cc\u9762\u7684 type id \u90fd\u662f 0x14\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"967\" height=\"335\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/02\/chunk-format-1-4.png\" alt=\"\" class=\"wp-image-940\"\/><\/figure>\n\n\n\n<p>\u8fd9\u79cd AMF \u5305\u91cc\u9762\u6709\u4e00\u4e2a \u5b57\u7b26\u4e32\uff0c\u8868\u793a\u8981\u6267\u884c\u54ea\u4e9b action \uff08\u52a8\u4f5c\uff09\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u4e0a\u9762\u7684RTMP chunk \u683c\u5f0f\uff0c\u662f RTMP \u534f\u8bae\u6808\u5185\u90e8\u7684\u4e1c\u897f\uff0c\u5bf9\u6211\u4eec\u8c03\u7528\u5c42\u6765\u8bf4\u662f\u900f\u660e\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u4ed6\u5185\u90e8\u5207\u6210\u591a\u5c11chunk\uff0cmessage header \u662f\u600e\u6837\u7684\uff0c\u6211\u4eec\u8c03\u7528\u5c42\u4e0d\u9700\u8981\u7279\u522b\u5173\u6ce8\u3002<\/p>\n\n\n\n<p>\u8c03\u7528\u5c42\u771f\u6b63\u4e22\u5411 RTMP \u534f\u8bae\u6808\u7684\u6570\u636e\u683c\u5f0f\u662f RTMP Message Format\u3002<\/p>\n\n\n\n<p><strong>\u91cd\u70b9\uff1a RTMP Chunk Format \u662f\u534f\u8bae\u6808\u5185\u90e8\u7684\uff0cRTMP Message Format \u662f\u8c03\u7528\u5c42\u81ea\u5df1\u7684\u3002<\/strong><\/p>\n\n\n\n<p>RTMP Message Format \u7684\u5934\u90e8\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"681\" height=\"276\" 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