{"id":169,"date":"2010-10-27T12:44:50","date_gmt":"2010-10-27T04:44:50","guid":{"rendered":"http:\/\/www.myvoipapp.com\/blogs\/yxh\/?p=169"},"modified":"2019-02-12T20:11:56","modified_gmt":"2019-02-12T12:11:56","slug":"%e9%80%9a%e4%bf%a1%e5%8d%8f%e8%ae%ae%e4%b8%8e%e5%ad%97%e8%8a%82%e5%ba%8f%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.myvoipapp.com\/blogs\/yxh\/2010\/10\/27\/%e9%80%9a%e4%bf%a1%e5%8d%8f%e8%ae%ae%e4%b8%8e%e5%ad%97%e8%8a%82%e5%ba%8f%e9%97%ae%e9%a2%98\/","title":{"rendered":"\u901a\u4fe1\u534f\u8bae\u4e0e\u5b57\u8282\u5e8f\u95ee\u9898"},"content":{"rendered":"

\u4f20\u7edf\u7684\u901a\u4fe1\u534f\u8bae\u901a\u5e38\u91c7\u7528\u5b57\u8282\u5e8f\u8fdb\u884c\u5b9a\u4e49\uff0c\u4e0e\u73b0\u4ee3\u7684VOIP\u534f\u8bae\u91c7\u7528\u6587\u672c\u65b9\u5f0f\u5b9a\u4e49\u622a\u7136\u76f8\u53cd\u3002\u91c7\u7528\u5b57\u8282\u5e8f\u65b9\u5f0f\u7684\u4f18\u70b9\u662f\u6548\u7387\u9ad8\u3001\u8282\u7701\u7a7a\u95f4\uff0c\u4f46\u662f\u4e5f\u5f15\u5165\u4e86\u5f88\u591a\u7684\u95ee\u9898\uff0c\u5176\u4e2d\u6700\u666e\u904d\u7684\u5c31\u662fbig endian\u548clittle endian\u7684\u95ee\u9898\u3002<\/p>\n

x86CPU\u91c7\u7528little endian\u5b57\u8282\u5e8f\uff0c\u800cpower\u7cfb\u5217\u91c7\u7528big endian\u5b57\u8282\u5e8f\u3002little endian\u662f\u4f4e\u5730\u5740\u5b58\u653e\u6700\u4f4e\u6709\u6548\u5b57\u8282\uff0c\u800cbig endian\u662f\u6307\u4f4e\u5730\u5740\u5b58\u653e\u6700\u9ad8\u6709\u6548\u5730\u5740\u3002\u901a\u5e38\u53c8\u628abig endian\u79f0\u4e3a\u7f51\u7edc\u5b57\u8282\u5e8f\u3002<\/div>\n
big endian\u6bd4\u8f83\u7b26\u5408\u4eba\u7c7b\u7684\u601d\u7ef4\u4e60\u60ef\uff0c\u4f8b\u5982\u6570\u5b570x12345678\u5728CPU\u4e2d\u7684\u5b58\u50a8\u987a\u5e8f\u5982\u4e0b\uff1a<\/div>\n
\n

Big Endian<\/p>\n

\u4f4e\u5730\u5740\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u9ad8\u5730\u5740
\n—————————————–>
\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n|\u00a0\u00a0\u00a0\u00a0\u00a0 12\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 34\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 56\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 78\u00a0\u00a0\u00a0\u00a0 |
\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<\/p>\n

Little Endian<\/p>\n

\u4f4e\u5730\u5740\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u9ad8\u5730\u5740
\n—————————————–>
\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n|\u00a0\u00a0\u00a0\u00a0\u00a0 78\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 56\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 34\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 12\u00a0\u00a0\u00a0\u00a0 |
\n+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<\/p>\n<\/div>\n

\u5728\u901a\u4fe1\u534f\u8bae\u4e2d\uff0c\u5f80\u5f80\u91c7\u7528Big endian\u5b9a\u4e49\u3002<\/span><\/div>\n

\n<\/span><\/div>\n
\u5728\u901a\u4fe1\u534f\u8bae\u8bbe\u8ba1\u65f6\uff0c\u4f4d\u57df\u7684\u5b9a\u4e49\u4e5f\u6709\u8fd9\u4e2a\u987a\u5e8f\u7684\u95ee\u9898\u3002\u53e6\u5916\uff0c\u5bf916\/32\u4f4d\u6574\u6570\uff0c\u4e5f\u9700\u8981\u6ce8\u610f\u8fdb\u884c\u4e3b\u673a\u5b57\u8282\u5e8f\u548c\u7f51\u7edc\u5b57\u8282\u5e8f\u7684\u8f6c\u6362\u3002<\/span><\/div>\n

\n<\/span><\/div>\n
\u4e0b\u9762\u4ee5RTP\u534f\u8bae\u7684\u4e00\u4e2a\u5b9a\u4e49\u4e3a\u4f8b\uff1a<\/span><\/div>\n
\n
\"\"<\/a>
\n<\/span><\/div>\n
\u76f8\u5e94\u7684C\u4ee3\u7801\u5b9a\u4e49\u4e3a\uff1a<\/span><\/div>\n
struct RTPHeader
\n{
\n#ifdef RTP_BIG_ENDIAN
\nuint8_t version:2;
\nuint8_t padding:1;
\nuint8_t extension:1;
\nuint8_t csrccount:4;<\/span><\/div>\n
uint8_t marker:1;<\/div>\n
<\/span><\/p>\n
uint8_t payloadtype:7;<\/div>\n<\/div>\n

#else \/\/ little endian
\nuint8_t csrccount:4;
\nuint8_t extension:1;
\nuint8_t padding:1;
\nuint8_t version:2;<\/p>\n

uint8_t payloadtype:7;
\nuint8_t marker:1;
\n#endif \/\/ RTP_BIG_ENDIAN<\/p>\n

uint16_t sequencenumber;
\nuint32_t timestamp;
\nuint32_t ssrc;
\n};<\/p>\n

\u5176\u4e2d\uff0csequencenumber\uff0ctimestamp\uff0cssrc\u5728\u53d1\u9001\u548c\u63a5\u6536\u65f6\uff0c\u9700\u505a\u5b57\u8282\u5e8f\u8f6c\u6362\u3002C\u8bed\u8a00\u4e2d\uff0c\u5e38\u7528\u51fd\u6570\u4e3a\uff1ahtons,htonl,ntohl,ntohs\u3002<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

\u4f20\u7edf\u7684\u901a\u4fe1\u534f\u8bae\u901a\u5e38\u91c7\u7528\u5b57\u8282\u5e8f\u8fdb\u884c\u5b9a\u4e49\uff0c\u4e0e\u73b0\u4ee3\u7684VOIP\u534f\u8bae\u91c7\u7528\u6587\u672c\u65b9\u5f0f\u5b9a\u4e49\u622a\u7136\u76f8\u53cd\u3002\u91c7\u7528\u5b57\u8282\u5e8f\u65b9\u5f0f\u7684\u4f18\u70b9\u662f\u6548\u7387\u9ad8\u3001\u8282\u7701\u7a7a\u95f4\uff0c\u4f46\u662f\u4e5f\u5f15\u5165\u4e86\u5f88\u591a\u7684\u95ee\u9898\uff0c\u5176\u4e2d\u6700\u666e\u904d\u7684…<\/p>\n

Read More Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[53],"tags":[65,63,66,64],"class_list":["post-169","post","type-post","status-publish","format-standard","hentry","category-53","tag-big-endian","tag-byte-orders","tag-little-endian","tag-x86"],"_links":{"self":[{"href":"https:\/\/www.myvoipapp.com\/blogs\/yxh\/wp-json\/wp\/v2\/posts\/169","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.myvoipapp.com\/blogs\/yxh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.myvoipapp.com\/blogs\/yxh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.myvoipapp.com\/blogs\/yxh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.myvoipapp.com\/blogs\/yxh\/wp-json\/wp\/v2\/comments?post=169"}],"version-history":[{"count":6,"href":"https:\/\/www.myvoipapp.com\/blogs\/yxh\/wp-json\/wp\/v2\/posts\/169\/revisions"}],"predecessor-version":[{"id":1947,"href":"https:\/\/www.myvoipapp.com\/blogs\/yxh\/wp-json\/wp\/v2\/posts\/169\/revisions\/1947"}],"wp:attachment":[{"href":"https:\/\/www.myvoipapp.com\/blogs\/yxh\/wp-json\/wp\/v2\/media?parent=169"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.myvoipapp.com\/blogs\/yxh\/wp-json\/wp\/v2\/categories?post=169"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.myvoipapp.com\/blogs\/yxh\/wp-json\/wp\/v2\/tags?post=169"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}