![\"menu-r.4af5f7ec.gif\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418172222-68028a4e15389.gif\")
<\/p>\n \u672c\u6587\u8fd8\u6709\u914d\u5957\u7684\u7cbe\u54c1\u8d44\u6e90，\u70b9\u51fb\u83b7\u53d6 <\/p>\n
\u7b80\u4ecb：RTSP（\u5b9e\u65f6\u6d41\u5a92\u4f53\u534f\u8bae）\u670d\u52a1\u5668\u5141\u8bb8\u5ba2\u6237\u7aef\u63a7\u5236\u548c\u540c\u6b65\u591a\u5a92\u4f53\u6570\u636e\u7684\u4f20\u8f93\u3002\u672c\u6587\u5c06\u8be6\u89e3\u4e00\u4e2aC\u8bed\u8a00\u5b9e\u73b0\u7684"rtsp_server"\u6e90\u7801，\u6db5\u76d6\u57fa\u7840\u6982\u5ff5\u3001\u6e90\u7801\u7ed3\u6784\u3001RTSP\u8bf7\u6c42\u5904\u7406\u3001RTP\/RTCP\u534f\u8bae\u5e94\u7528\u3001\u5b9e\u73b0\u7ec6\u8282\u3001\u7f16\u8bd1\u8fd0\u884c\u4ee5\u53ca\u8c03\u8bd5\u6d4b\u8bd5\u7b49\u73af\u8282，\u65e8\u5728\u5e2e\u52a9\u7406\u89e3RTSP\u670d\u52a1\u5668\u7684\u5de5\u4f5c\u539f\u7406\u548c\u5b9e\u73b0\u65b9\u6cd5，\u63d0\u5347\u7f51\u7edc\u670d\u52a1\u5f00\u53d1\u6280\u80fd\u3002 ![\"rtsp_server](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418172222-68028a4e26374.png\")
<\/p>\n
RTSP（Real Time Streaming Protocol）\u662f\u4e00\u79cd\u7f51\u7edc\u63a7\u5236\u534f\u8bae，\u4e13\u4e3a\u6d41\u5a92\u4f53\u670d\u52a1\u3002\u5176\u4e3b\u8981\u529f\u80fd\u662f\u5728\u670d\u52a1\u5668\u548c\u5ba2\u6237\u7aef\u4e4b\u95f4\u5efa\u7acb\u548c\u63a7\u5236\u5a92\u4f53\u4f1a\u8bdd\u3002RTSP\u8d1f\u8d23\u7ba1\u7406\u5a92\u4f53\u4f20\u8f93，\u5141\u8bb8\u5ba2\u6237\u7aef\u5728\u63a5\u6536\u6570\u636e\u7684\u540c\u65f6，\u5bf9\u5a92\u4f53\u7684\u64ad\u653e\u3001\u6682\u505c\u3001\u5feb\u8fdb\u7b49\u8fdb\u884c\u63a7\u5236\u3002 <\/p>\n
\u4e0eRTSP\u7d27\u5bc6\u76f8\u5173\u7684\u662fRTP（Real-time Transport Protocol）\u548cRTCP（Real-time Control Protocol）\u3002RTSP\u7528\u4e8e\u5efa\u7acb\u548c\u63a7\u5236\u5a92\u4f53\u4f1a\u8bdd，\u800cRTP\u8d1f\u8d23\u5a92\u4f53\u6570\u636e\u7684\u4f20\u8f93\u548c\u65f6\u95f4\u540c\u6b65\u3002RTCP\u5219\u63d0\u4f9b\u8d28\u91cf\u53cd\u9988\u548c\u4f1a\u8bdd\u7edf\u8ba1\u4fe1\u606f\u3002RTSP\u901a\u5e38\u4e0d\u8d1f\u8d23\u5a92\u4f53\u6570\u636e\u7684\u4f20\u8f93，\u8fd9\u662fRTP\u7684\u5de5\u4f5c\u3002RTCP\u5219\u662f\u4e3a\u4e86\u63a7\u5236RTP\u6d41\u7684\u8d28\u91cf，\u5982\u4e22\u5305\u7387\u3001\u5ef6\u8fdf\u7b49\u6307\u6807\u7684\u53cd\u9988\u3002 <\/p>\n
RTSP\u534f\u8bae\u662f\u4e00\u4e2a\u5e94\u7528\u5c42\u534f\u8bae，\u901a\u5e38\u8fd0\u884c\u5728TCP\u6216UDP\u4e4b\u4e0a，\u9ed8\u8ba4\u7aef\u53e3\u4e3a554\u3002\u5b83\u5141\u8bb8\u7528\u6237\u8fdc\u7a0b\u63a7\u5236\u6d41\u5a92\u4f53\u670d\u52a1\u5668，\u4f8b\u5982\u70b9\u64ad\u3001\u6682\u505c\u3001\u5feb\u8fdb\u3001\u5feb\u9000\u7b49\u64cd\u4f5c\u3002RTSP\u5177\u6709\u4f1a\u8bdd\u63a7\u5236\u673a\u5236，\u80fd\u591f\u7ba1\u7406\u5a92\u4f53\u7684\u5b9e\u65f6\u4f20\u8f93，\u4e14\u5177\u5907\u9ad8\u53ef\u9760\u6027\u548c\u826f\u597d\u7684\u6269\u5c55\u6027，\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8e\u89c6\u9891\u76d1\u63a7\u3001\u89c6\u9891\u70b9\u64ad\u548c\u7f51\u7edc\u4f1a\u8bae\u7b49\u9886\u57df\u3002 <\/p>\n
rtsp_server \u662f\u4e00\u4e2a\u590d\u6742\u7684\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u5e94\u7528，\u65e8\u5728\u5b9e\u73b0 RTSP \u534f\u8bae\u7684\u6240\u6709\u6838\u5fc3\u529f\u80fd\u3002\u5b83\u88ab\u8bbe\u8ba1\u4e3a\u9ad8\u5ea6\u6a21\u5757\u5316，\u4ee5\u4fc3\u8fdb\u53ef\u6269\u5c55\u6027\u548c\u7ef4\u62a4\u6027\u3002rtsp_server \u7684\u4e3b\u8981\u6a21\u5757\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u90e8\u5206： <\/p>\n
rtsp_server \u7684\u6838\u5fc3\u6587\u4ef6\u5206\u5e03\u5927\u81f4\u5982\u4e0b： <\/p>\n
\u5728 rtsp_server \u4e2d，\u4f1a\u8bdd\u662f\u901a\u8fc7\u4e00\u4e2a\u7ed3\u6784\u4f53 session_t \u6765\u7ba1\u7406\u7684，\u5176\u5b9a\u4e49\u5982\u4e0b： <\/p>\n
typedef struct {
\n char id[SESSION_ID_LENGTH]; \/\/ \u552f\u4e00\u4f1a\u8bdd\u6807\u8bc6\u7b26
\n int state; \/\/ \u5f53\u524d\u4f1a\u8bdd\u72b6\u6001
\n time_t timestamp; \/\/ \u4f1a\u8bdd\u65f6\u95f4\u6233
\n struct in_addr client_ip; \/\/ \u5ba2\u6237\u7aef IP \u5730\u5740
\n uint16_t client_port; \/\/ \u5ba2\u6237\u7aef\u7aef\u53e3
\n \/\/ \u5176\u4ed6\u5b57\u6bb5…
\n} session_t;<\/p>\n
\u6bcf\u4e2a\u4f1a\u8bdd\u90fd\u6709\u4e00\u4e2a\u552f\u4e00\u7684 id \u7528\u4e8e\u6807\u8bc6， state \u5b57\u6bb5\u8868\u793a\u4f1a\u8bdd\u7684\u5f53\u524d\u72b6\u6001（\u5982\u7b49\u5f85\u8ba4\u8bc1\u3001\u6d3b\u8dc3\u3001\u5df2\u5173\u95ed\u7b49）\u3002 timestamp \u5b57\u6bb5\u7528\u4e8e\u8ddf\u8e2a\u4f1a\u8bdd\u7684\u751f\u547d\u5468\u671f\u3002 <\/p>\n
\u5a92\u4f53\u6d41\u7684\u63a7\u5236\u901a\u8fc7 stream_t \u7ed3\u6784\u4f53\u8fdb\u884c\u7ba1\u7406，\u5176\u5b9a\u4e49\u5982\u4e0b： <\/p>\n
typedef struct {
\n char uri[URI_LENGTH]; \/\/ \u6d41\u7684 URI
\n int state; \/\/ \u6d41\u7684\u72b6\u6001
\n int stream_type; \/\/ \u6d41\u7684\u7c7b\u578b（\u5982\u97f3\u9891\u3001\u89c6\u9891）
\n \/\/ \u6307\u5411\u5a92\u4f53\u6570\u636e\u7684\u6307\u9488\u7b49…
\n} stream_t;<\/p>\n
stream_t \u5305\u542b\u4e86\u6d41\u7684 URI， state \u5b57\u6bb5\u8868\u793a\u5f53\u524d\u6d41\u7684\u72b6\u6001（\u4f8b\u5982，\u662f\u5426\u6b63\u5728\u64ad\u653e\u3001\u6682\u505c\u7b49）， stream_type \u8868\u793a\u5a92\u4f53\u6d41\u7684\u7c7b\u578b\u3002 <\/p>\n
\u7f51\u7edc\u4f20\u8f93\u76f8\u5173\u7684\u6570\u636e\u7ed3\u6784 connection_t \u7528\u4e8e\u7ba1\u7406\u4e0e\u5ba2\u6237\u7aef\u7684\u8fde\u63a5，\u5176\u5b9a\u4e49\u5982\u4e0b： <\/p>\n
typedef struct {
\n int sock; \/\/ socket \u63cf\u8ff0\u7b26
\n struct sockaddr_in client_addr; \/\/ \u5ba2\u6237\u7aef\u5730\u5740
\n int timeout; \/\/ \u8d85\u65f6\u8bbe\u7f6e
\n struct pollfd pfd; \/\/ poll \u4e8b\u4ef6\u63cf\u8ff0\u7b26
\n \/\/ \u5176\u4ed6\u5b57\u6bb5…
\n} connection_t;<\/p>\n
connection_t \u4e2d\u5305\u542b\u4e86 socket \u63cf\u8ff0\u7b26 sock ，\u5ba2\u6237\u7aef\u5730\u5740\u4fe1\u606f client_addr ，\u8fde\u63a5\u7684\u8d85\u65f6\u65f6\u95f4 timeout ，\u4ee5\u53ca\u7528\u4e8e poll \u7cfb\u7edf\u8c03\u7528\u7684 pfd \u7ed3\u6784\u3002 <\/p>\n
\u4ee5\u4e0a\u5c31\u662f rtsp_server \u6e90\u7801\u7ed3\u6784\u7684\u5173\u952e\u6570\u636e\u7ed3\u6784\u3002\u5728\u4e0b\u4e00\u7ae0\u8282\u4e2d，\u6211\u4eec\u5c06\u6df1\u5165\u5206\u6790 RTSP \u8bf7\u6c42\u7684\u5904\u7406\u6d41\u7a0b\u3002 <\/p>\n
RTSP\u534f\u8bae\u4f5c\u4e3a\u4e00\u79cd\u63a7\u5236\u5a92\u4f53\u4f1a\u8bdd\u7684\u534f\u8bae，\u5176\u8bf7\u6c42\u6d88\u606f\u7684\u89e3\u6790\u662f\u6574\u4e2aRTSP\u901a\u4fe1\u4e2d\u7684\u57fa\u77f3\u3002\u89e3\u6790\u8bf7\u6c42\u6d88\u606f\u7684\u4e3b\u8981\u76ee\u7684\u662f\u7406\u89e3\u548c\u6267\u884c\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42，\u5982\u64ad\u653e\u3001\u6682\u505c\u3001\u505c\u6b62\u7b49\u64cd\u4f5c\u3002 <\/p>\n
\u8bf7\u6c42\u884c\u901a\u5e38\u5305\u62ecRTSP\u65b9\u6cd5\u3001URI\u4ee5\u53caRTSP\u534f\u8bae\u7248\u672c\u3002\u4f8b\u5982，\u4e00\u4e2a\u5178\u578b\u7684RTSP\u8bf7\u6c42\u884c\u662f DESCRIBE rtsp:\/\/***\/media.sdp RTSP\/1.0 \u3002\u8fd9\u4e2a\u8bf7\u6c42\u884c\u53ef\u4ee5\u89e3\u6790\u4e3a： <\/p>\n
\u89e3\u6790\u8bf7\u6c42\u884c\u7684\u4ee3\u7801\u7247\u6bb5\u5982\u4e0b： <\/p>\n
char *method = strtok(line, " "); \/\/ \u63d0\u53d6\u65b9\u6cd5
\nchar *uri = strtok(NULL, " "); \/\/ \u63d0\u53d6URI
\nchar *version = strtok(NULL, "\\\\r\\\\n"); \/\/ \u63d0\u53d6\u7248\u672c\u4fe1\u606f<\/p>\n
\/\/ \u53c2\u6570\u68c0\u67e5\u4e0e\u5904\u7406\u903b\u8f91…<\/p>\n
\u8bf7\u6c42\u5934\u5305\u542b\u4e86\u591a\u4e2a\u5b57\u6bb5，\u8fd9\u4e9b\u5b57\u6bb5\u63d0\u4f9b\u4e86\u8bf7\u6c42\u7684\u9644\u52a0\u4fe1\u606f\u3002\u6bd4\u5982 CSeq \u5b57\u6bb5\u6307\u660e\u4e86\u8bf7\u6c42\u7684\u5e8f\u5217\u53f7，\u7528\u4e8e\u540c\u6b65\u8bf7\u6c42\u548c\u54cd\u5e94\u3002\u89e3\u6790\u8bf7\u6c42\u5934\u7684\u4ee3\u7801\u7247\u6bb5\u53ef\u80fd\u5982\u4e0b： <\/p>\n
while (1) {
\n char *field_name = strtok(NULL, ": ");
\n char *field_value = strtok(NULL, "\\\\r\\\\n");
\n if (field_name == NULL || field_value == NULL) break; \/\/ \u8bed\u6cd5\u7ed3\u675f<\/p>\n
\/\/ \u5b57\u6bb5\u540d\u548c\u503c\u7684\u6620\u5c04\u5904\u7406…
\n}<\/p>\n
\u8bf7\u6c42\u5934\u7684\u89e3\u6790\u5e94\u652f\u6301\u591a\u884c\u5b57\u6bb5\u503c\u7684\u5904\u7406，\u4f8b\u5982 Session \u5b57\u6bb5\u53ef\u80fd\u8de8\u8d8a\u591a\u884c\u3002 <\/p>\n
RTSP\u54cd\u5e94\u6d88\u606f\u7684\u6784\u9020\u9700\u8981\u4e25\u683c\u6309\u7167RTSP\u534f\u8bae\u89c4\u8303\u6765\u6784\u9020\u54cd\u5e94\u884c\u548c\u54cd\u5e94\u5934，\u540c\u65f6\u643a\u5e26\u54cd\u5e94\u4f53\u3002 <\/p>\n
\u54cd\u5e94\u884c\u5305\u62ecRTSP\u7248\u672c\u3001\u72b6\u6001\u7801\u548c\u72b6\u6001\u7801\u63cf\u8ff0\u3002\u4f8b\u5982，\u6210\u529f\u7684\u54cd\u5e94\u53ef\u80fd\u5982\u4e0b\u6240\u793a： <\/p>\n
RTSP\/1.0 200 OK<\/p>\n
\u72b6\u6001\u7801 200 \u8868\u793a\u8bf7\u6c42\u5df2\u88ab\u6210\u529f\u5904\u7406\u3002 <\/p>\n
\u54cd\u5e94\u5934\u53ef\u4ee5\u5305\u542b\u591a\u79cd\u5b57\u6bb5，\u6bd4\u5982 Content-Type \u6307\u660e\u54cd\u5e94\u4f53\u7684\u7c7b\u578b， Content-Length \u6307\u660e\u54cd\u5e94\u4f53\u7684\u957f\u5ea6\u3002\u6784\u9020\u54cd\u5e94\u5934\u7684\u4ee3\u7801\u7247\u6bb5\u53ef\u80fd\u5982\u4e0b： <\/p>\n
void construct_response_head(char *buffer, int content_length, const char* content_type) {
\n snprintf(buffer, BUFFER_SIZE, "RTSP\/1.0 %d %s\\\\r\\\\n", 200, "OK");
\n strcat(buffer, "Content-Type: ");
\n strcat(buffer, content_type);
\n strcat(buffer, "\\\\r\\\\n");
\n strcat(buffer, "Content-Length: ");
\n strcat(buffer, content_length);
\n strcat(buffer, "\\\\r\\\\n\\\\r\\\\n");
\n}<\/p>\n
\u6784\u9020\u54cd\u5e94\u5934\u65f6，\u9700\u8981\u786e\u4fdd\u6b63\u786e\u8bbe\u7f6e\u5b57\u6bb5\u987a\u5e8f\u5e76\u7ec8\u6b62\u884c\u3002 <\/p>\n
\u4f1a\u8bdd\u72b6\u6001\u7ba1\u7406\u662fRTSP\u670d\u52a1\u5668\u7684\u91cd\u8981\u7ec4\u6210\u90e8\u5206，\u5b83\u8d1f\u8d23\u4f1a\u8bdd\u7684\u5efa\u7acb\u3001\u7ef4\u62a4\u548c\u7ed3\u675f\u3002 <\/p>\n
\u4f1a\u8bdd\u7684\u5efa\u7acb\u662f\u901a\u8fc7\u5ba2\u6237\u7aef\u53d1\u8d77DESCRIBE\u8bf7\u6c42，\u5e76\u901a\u8fc7\u670d\u52a1\u5668\u7684\u54cd\u5e94\u4e2d\u8fd4\u56de\u7684 Session \u5934\u5b57\u6bb5\u3002\u7ef4\u62a4\u4f1a\u8bdd\u901a\u5e38\u9700\u8981\u5b9a\u671f\u4ea4\u4e92\u5982OPTIONS\u6216PLAY\u8bf7\u6c42，\u4ee5\u7ef4\u6301\u4f1a\u8bdd\u7684\u6d3b\u8dc3\u72b6\u6001\u3002 <\/p>\n
\u4f1a\u8bdd\u7684\u5173\u95ed\u53ef\u4ee5\u901a\u8fc7\u5ba2\u6237\u7aef\u53d1\u9001TEARDOWN\u8bf7\u6c42\u6765\u5b8c\u6210，\u6216\u8005\u670d\u52a1\u5668\u7aef\u5728\u4e00\u5b9a\u6761\u4ef6\u4e0b\u81ea\u52a8\u5173\u95ed\u7a7a\u95f2\u7684\u4f1a\u8bdd\u3002\u6e05\u7406\u4f1a\u8bdd\u65f6，\u9700\u8981\u91ca\u653e\u670d\u52a1\u5668\u7aef\u6240\u6709\u4e0e\u8be5\u4f1a\u8bdd\u76f8\u5173\u7684\u8d44\u6e90\u3002 <\/p>\n
\u603b\u7ed3\u4ee5\u4e0a\u5185\u5bb9，RTSP\u8bf7\u6c42\u5904\u7406\u6d41\u7a0b\u6db5\u76d6\u4e86\u4ece\u89e3\u6790\u5ba2\u6237\u7aef\u8bf7\u6c42\u5230\u6784\u9020\u54cd\u5e94\u6d88\u606f，\u5e76\u7ba1\u7406\u4f1a\u8bdd\u72b6\u6001\u7684\u5b8c\u6574\u8fc7\u7a0b\u3002\u6bcf\u4e00\u73af\u8282\u90fd\u9700\u8981\u4e25\u683c\u9075\u5b88RTSP\u534f\u8bae\u7684\u6807\u51c6，\u786e\u4fdd\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u80fd\u591f\u6b63\u786e\u9ad8\u6548\u5730\u901a\u4fe1\u3002 <\/p>\n
RTP（Real-time Transport Protocol，\u5b9e\u65f6\u4f20\u8f93\u534f\u8bae）\u662f\u4e00\u79cd\u7f51\u7edc\u534f\u8bae，\u7528\u4e8e\u901a\u8fc7IP\u7f51\u7edc\u4f20\u8f93\u97f3\u9891\u548c\u89c6\u9891\u6d41\u3002\u5728\u591a\u5a92\u4f53\u901a\u4fe1\u7cfb\u7edf\u4e2d，RTP\u4e3b\u8981\u8d1f\u8d23\u6570\u636e\u7684\u7aef\u5230\u7aef\u4f20\u8f93\u529f\u80fd，\u786e\u4fdd\u5a92\u4f53\u6570\u636e\u53ef\u4ee5\u5b9e\u65f6\u3001\u8fde\u7eed\u5730\u4f20\u8f93\u7ed9\u63a5\u6536\u7aef\u3002RTP\u6570\u636e\u5305\u88ab\u5c01\u88c5\u5728UDP\u6570\u636e\u62a5\u6587\u4e2d\u8fdb\u884c\u4f20\u8f93，\u56e0\u4e3a\u5b83\u9700\u8981\u5feb\u901f\u4f20\u8f93，\u800cUDP\u6ca1\u6709\u590d\u6742\u7684\u8fde\u63a5\u5efa\u7acb\u8fc7\u7a0b，\u9002\u5408\u5b9e\u65f6\u901a\u4fe1\u3002 <\/p>\n
RTP\u6570\u636e\u5305\u7684\u7ed3\u6784\u5982\u4e0b： – RTP\u62a5\u5934：\u5305\u542b\u5e8f\u5217\u53f7\u3001\u65f6\u95f4\u6233\u3001SSRC（\u540c\u6b65\u6e90\u6807\u8bc6\u7b26）\u7b49\u4fe1\u606f\u3002 – \u8f7d\u8377：\u5b9e\u9645\u7684\u97f3\u9891\u6216\u89c6\u9891\u6570\u636e\u3002 <\/p>\n
***
\n ***
\n +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n |V=2|P|X| CC |M| PT | sequence number |
\n +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n | timestamp |
\n +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n | synchronization source (SSRC) identifier |
\n +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
\n | contributing source (CSRC) identifiers |
\n | …. |
\n +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<\/p>\n
\u5e8f\u5217\u53f7\u7528\u4e8e\u6570\u636e\u5305\u6392\u5e8f\u548c\u68c0\u6d4b\u4e22\u5931，\u65f6\u95f4\u6233\u8868\u793a\u5a92\u4f53\u6570\u636e\u5305\u7684\u91c7\u6837\u65f6\u95f4，SSRC\u7528\u4e8e\u6807\u8bc6\u540c\u6b65\u6e90\u3002 <\/p>\n
\u4e3a\u4e86\u5728\u63a5\u6536\u7aef\u4fdd\u6301\u5a92\u4f53\u6570\u636e\u7684\u540c\u6b65\u548c\u65f6\u5e8f，RTP\u4f7f\u7528\u4e86\u65f6\u95f4\u6233\u548c\u5e8f\u5217\u53f7\u4e24\u4e2a\u5173\u952e\u5b57\u6bb5\u3002\u65f6\u95f4\u6233\u53cd\u6620\u4e86\u6570\u636e\u5305\u4e2d\u7b2c\u4e00\u4e2a\u5b57\u8282\u7684\u91c7\u6837\u65f6\u95f4，\u5e8f\u5217\u53f7\u7528\u4e8e\u68c0\u6d4b\u6570\u636e\u5305\u4e22\u5931\u548c\u91cd\u6392\u5e8f\u3002\u63a5\u6536\u7aef\u6839\u636e\u8fd9\u4e9b\u4fe1\u606f\u53ef\u4ee5\u6267\u884c\u7f13\u51b2\u3001\u540c\u6b65\u4ee5\u53ca\u7ea0\u6b63\u5931\u5e8f\u7684\u6570\u636e\u5305\u3002 <\/p>\n
\u63a5\u6536\u7aef\u5904\u7406RTP\u6d41\u7684\u57fa\u672c\u903b\u8f91\u5982\u4e0b： 1. \u5229\u7528\u65f6\u95f4\u6233\u5224\u65ad\u6570\u636e\u5305\u7684\u91c7\u6837\u65f6\u95f4\u3002 2. \u901a\u8fc7\u5e8f\u5217\u53f7\u68c0\u6d4b\u548c\u91cd\u65b0\u6392\u5e8f\u5230\u8fbe\u7684\u6570\u636e\u5305\u3002 3. \u5982\u679c\u68c0\u6d4b\u5230\u4e22\u5305，\u53ef\u4ee5\u8fdb\u884c\u9519\u8bef\u9690\u85cf\u6216\u8bf7\u6c42\u91cd\u4f20（\u5982\u679c\u534f\u8bae\u652f\u6301）\u3002 <\/p>\n
RTCP（Real-time Control Protocol，\u5b9e\u65f6\u63a7\u5236\u534f\u8bae）\u4e0eRTP\u914d\u5408\u4f7f\u7528，\u63d0\u4f9b\u4f20\u8f93\u63a7\u5236\u529f\u80fd\u3002RTCP\u5468\u671f\u6027\u5730\u5728\u63a5\u6536\u7aef\u751f\u6210\u63a7\u5236\u4fe1\u606f，\u5e76\u5728\u53d1\u9001\u7aef\u6536\u96c6\u8fd9\u4e9b\u4fe1\u606f，\u4ee5\u76d1\u63a7\u6570\u636e\u4f20\u8f93\u7684\u8d28\u91cf\u548c\u7edf\u8ba1\u4fe1\u606f，\u5e76\u63d0\u4f9b\u53cd\u9988\u3002RTCP\u63a7\u5236\u5305\u901a\u5e38\u5305\u542b\u53d1\u9001\u8005\u62a5\u544a（SR）\u548c\u63a5\u6536\u8005\u62a5\u544a（RR），\u4ee5\u53ca\u5176\u4ed6\u7c7b\u578b\u7684\u63a7\u5236\u6d88\u606f，\u5982\u6e90\u63cf\u8ff0\u9879（SDES），\u5e94\u7528\u7279\u5b9a\u7684\u6d88\u606f（APP）\u7b49\u3002 <\/p>\n
RTCP\u7684\u53d1\u9001\u8005\u62a5\u544a（SR）\u793a\u4f8b\u5982\u4e0b： <\/p>\n
***
\n ***
\n +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n |V=2|P| RC | PT=SR=200 | length |
\n +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n | SSRC of sender |
\n +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
\n | NTP timestamp, most significant word |
\n +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n | NTP timestamp, least significant word |
\n +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n | RTP timestamp |
\n +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n | sender's packet count |
\n +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n | sender's octet count |
\n +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
\n | SSRC_1 (SSRC of first source) |
\n +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
\n | fraction lost | cumulative number of packets lost |
\n +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
\n | extended highest sequence number received |
\n +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
\n | inter-arrival jitter |
\n +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
\n | last SR (LSR) |
\n +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\n | delay since last SR (DLSR) |
\n +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
\n | SSRC_2 (SSRC of second source) |
\n +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
\n : … continued additional blocks :
\n +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+<\/p>\n
\u5728\u6bcf\u4e2a\u62a5\u544a\u4e2d，\u4f1a\u5305\u542b\u53d1\u9001\u7aef\u548c\u63a5\u6536\u7aef\u7684\u7edf\u8ba1\u4fe1\u606f，\u5982\u4e22\u5305\u7387\u3001\u6296\u52a8\u7b49\u3002 <\/p>\n
RTCP\u63d0\u4f9b\u4e86\u4e00\u4e2a\u53cd\u9988\u673a\u5236，\u63a5\u6536\u7aef\u53ef\u4ee5\u53d1\u9001RTCP\u63a5\u6536\u8005\u62a5\u544a（RR）\u7ed9\u53d1\u9001\u7aef，\u62a5\u544a\u4e2d\u5305\u542b\u63a5\u6536\u7aef\u5bf9\u5a92\u4f53\u8d28\u91cf\u7684\u8bc4\u4f30，\u4f8b\u5982\u4e22\u5305\u7387\u548c\u6296\u52a8\u3002\u53d1\u9001\u7aef\u6839\u636e\u8fd9\u4e9b\u53cd\u9988\u4fe1\u606f\u53ef\u4ee5\u8c03\u6574\u4f20\u8f93\u901f\u7387，\u8fdb\u884c\u62e5\u585e\u63a7\u5236\u4ee5\u4fdd\u8bc1\u8d28\u91cf\u3002 <\/p>\n
\u4f8b\u5982，\u5982\u679c\u68c0\u6d4b\u5230\u9ad8\u4e22\u5305\u7387，\u53d1\u9001\u7aef\u53ef\u80fd\u4f1a\u964d\u4f4e\u6bd4\u7279\u7387\u4ee5\u51cf\u5c11\u7f51\u7edc\u8d1f\u8f7d，\u53cd\u4e4b\u4ea6\u7136\u3002RTCP\u7684\u53cd\u9988\u8fd8\u53ef\u4ee5\u7528\u4e8e\u5176\u4ed6\u63a7\u5236\u529f\u80fd，\u5982\u5a92\u4f53\u540c\u6b65\u3001\u591a\u64ad\u7ba1\u7406\u3001\u4f1a\u8bae\u63a7\u5236\u7b49\u3002 <\/p>\n
RTP\/RTCP\u4e0eRTSP\u534f\u8bae\u6808\u4e4b\u95f4\u9700\u8981\u534f\u540c\u5de5\u4f5c\u4ee5\u786e\u4fdd\u5a92\u4f53\u6d41\u7684\u5b9e\u65f6\u4f20\u8f93\u548c\u63a7\u5236\u3002RTSP\u534f\u8bae\u8d1f\u8d23\u5efa\u7acb\u548c\u63a7\u5236\u5a92\u4f53\u4f1a\u8bdd，\u800cRTP\/RTCP\u8d1f\u8d23\u5b9e\u9645\u7684\u5a92\u4f53\u6570\u636e\u4f20\u8f93\u548c\u4f20\u8f93\u63a7\u5236\u3002\u5728\u4f1a\u8bdd\u5efa\u7acb\u65f6，RTSP\u534f\u5546RTP\u7684\u7aef\u53e3\u548c\u5a92\u4f53\u6d41\u53c2\u6570，\u968f\u540eRTP\/RTCP\u5728\u8fd9\u4e9b\u53c2\u6570\u7684\u6307\u5bfc\u4e0b\u5f00\u59cb\u6570\u636e\u4f20\u8f93\u3002 <\/p>\n
RTSP\u4ea4\u4e92\u6d41\u7a0b\u4e00\u822c\u4e3a： 1. \u53d1\u9001SETUP\u8bf7\u6c42，\u914d\u7f6e\u5a92\u4f53\u4f1a\u8bdd\u3002 2. \u53d1\u9001PLAY\u8bf7\u6c42，\u5f00\u59cb\u5a92\u4f53\u4f20\u8f93\u3002 3. RTP\/RTCP\u5f00\u59cb\u4f20\u8f93\u6570\u636e，\u540c\u65f6RTCP\u53d1\u9001\u63a7\u5236\u62a5\u544a\u3002 4. \u4f20\u8f93\u8fc7\u7a0b\u4e2d，RTSP\u53ef\u4ee5\u8c03\u6574\u4f1a\u8bdd\u53c2\u6570，\u6216\u8005\u53d1\u9001TEARDOWN\u7ec8\u6b62\u4f1a\u8bdd\u3002 <\/p>\n
\u5b9e\u65f6\u5a92\u4f53\u6d41\u9700\u8981\u9002\u5e94\u7f51\u7edc\u6761\u4ef6\u7684\u53d8\u5316，\u8fdb\u884c\u5b9e\u65f6\u63a7\u5236\u548c\u8c03\u6574\u3002RTCP\u7684\u53cd\u9988\u4fe1\u606f\u53ef\u4ee5\u6307\u5bfc\u53d1\u9001\u7aef\u8c03\u6574\u5176\u53d1\u9001\u901f\u7387，\u800cRTSP\u63d0\u4f9b\u4e86\u4f1a\u8bdd\u63a7\u5236\u7684\u624b\u6bb5\u3002\u4f8b\u5982，\u5728\u7f51\u7edc\u5e26\u5bbd\u4e0b\u964d\u65f6，\u53d1\u9001\u7aef\u53ef\u4ee5\u964d\u4f4e\u7f16\u7801\u6bd4\u7279\u7387，\u6216\u8005\u5728\u4e22\u5305\u4e25\u91cd\u65f6\u8bf7\u6c42\u91cd\u4f20\u91cd\u8981\u6570\u636e\u5305\u3002 <\/p>\n
\u5177\u4f53\u63a7\u5236\u52a8\u4f5c\u5305\u62ec： – \u52a8\u6001\u8c03\u6574\u7f16\u7801\u53c2\u6570，\u5982\u6bd4\u7279\u7387\u3001\u5e27\u7387\u3002 – \u5728\u68c0\u6d4b\u5230\u7f51\u7edc\u62e5\u585e\u65f6，\u91c7\u53d6\u9002\u5e94\u6027\u4f20\u8f93\u7b56\u7565\u3002 – \u6839\u636e\u4f1a\u8bdd\u72b6\u6001，\u63a7\u5236\u5a92\u4f53\u7684\u64ad\u653e\u3001\u6682\u505c\u6216\u505c\u6b62\u3002 <\/p>\n
\u4ee5\u4e0a\u7ec6\u8282\u5c55\u793a\u4e86RTP\u548cRTCP\u534f\u8bae\u5728\u5b9e\u65f6\u5a92\u4f53\u4f20\u8f93\u4e2d\u7684\u57fa\u672c\u5e94\u7528\u548c\u4ea4\u4e92\u673a\u5236\u3002\u8fd9\u4e9b\u534f\u8bae\u6808\u4e4b\u95f4\u7684\u5bc6\u5207\u914d\u5408\u662f\u5b9e\u73b0\u7a33\u5b9a\u3001\u9ad8\u8d28\u91cf\u7684\u5b9e\u65f6\u901a\u4fe1\u7cfb\u7edf\u7684\u57fa\u7840\u3002 <\/p>\n
\u7f51\u7edc\u5c42\u7684\u5b9e\u73b0\u6d89\u53ca\u5230\u5e95\u5c42\u7684\u7f51\u7edc\u901a\u4fe1，\u5305\u62ec\u76d1\u542c\u3001\u63a5\u6536\u3001\u53d1\u9001\u6570\u636e\u5305\u7b49\u64cd\u4f5c\u3002\u4ee5\u4e00\u4e2a\u5178\u578b\u7684\u57fa\u4e8e\u4e8b\u4ef6\u9a71\u52a8\u7684\u7f51\u7edc\u6846\u67b6\u4e3a\u4f8b，\u7f51\u7edc\u4e8b\u4ef6\u7684\u76d1\u542c\u4e0e\u5904\u7406\u901a\u5e38\u662f\u7531\u4e00\u4e2a\u4e8b\u4ef6\u5faa\u73af（event loop）\u6765\u9a71\u52a8\u7684，\u8be5\u5faa\u73af\u4f1a\u76d1\u63a7\u591a\u4e2asocket\u7684\u4e8b\u4ef6，\u5e76\u5728\u9002\u5f53\u7684\u65f6\u673a\u8c03\u7528\u76f8\u5e94\u7684\u56de\u8c03\u51fd\u6570\u5904\u7406\u8fd9\u4e9b\u4e8b\u4ef6\u3002 <\/p>\n
\/\/ \u793a\u4f8b\u4ee3\u7801：\u7f51\u7edc\u4e8b\u4ef6\u76d1\u542c\u4e0e\u5904\u7406\u4f2a\u4ee3\u7801<\/p>\n
\/\/ \u521d\u59cb\u5316socket
\nint socket_fd = socket(AF_INET, SOCK_STREAM, 0);
\n\/\/ \u8bbe\u7f6esocket\u4e3a\u975e\u963b\u585e\u6a21\u5f0f
\nfcntl(socket_fd, F_SETFL, O_NONBLOCK);<\/p>\n
\/\/ \u7ed1\u5b9a\u5730\u5740\u548c\u7aef\u53e3
\nstruct sockaddr_in server_addr;
\nmemset(&server_addr, 0, sizeof(server_addr));
\nserver_addr.sin_family = AF_INET;
\nserver_addr.sin_port = htons(554); \/\/ RTSP\u7aef\u53e3
\nserver_addr.sin_addr.s_addr = INADDR_ANY;<\/p>\n
bind(socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr));<\/p>\n
\/\/ \u76d1\u542c\u8fde\u63a5
\nlisten(socket_fd, SOMAXCONN);<\/p>\n
\/\/ \u4e8b\u4ef6\u5faa\u73af
\nwhile (running) {
\n \/\/ \u8c03\u7528\u5e95\u5c42\u51fd\u6570\u83b7\u53d6\u4e8b\u4ef6\u96c6\u5408
\n fd_set readfds;
\n FD_ZERO(&readfds);
\n FD_SET(socket_fd, &readfds);<\/p>\n
\/\/ \u7b49\u5f85\u4e8b\u4ef6
\n int n = select(socket_fd + 1, &readfds, NULL, NULL, NULL);<\/p>\n
\/\/ \u5904\u7406\u4e8b\u4ef6
\n if (FD_ISSET(socket_fd, &readfds)) {
\n \/\/ \u5904\u7406\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42\u6216\u63a5\u6536\u6570\u636e
\n struct sockaddr_in client_addr;
\n socklen_t client_len = sizeof(client_addr);
\n int client_fd = accept(socket_fd, (struct sockaddr*)&client_addr, &client_len);<\/p>\n
\/\/ \u5c06\u65b0socket\u52a0\u5165\u5230\u4e8b\u4ef6\u76d1\u542c
\n \/\/ …
\n }<\/p>\n
\/\/ \u5176\u4ed6\u4e8b\u4ef6\u5904\u7406
\n \/\/ …
\n}<\/p>\n
\u5728\u4e0a\u8ff0\u4f2a\u4ee3\u7801\u4e2d， socket \u3001 bind \u3001 listen \u3001 select \u3001 accept \u662f\u5173\u952e\u7684\u7cfb\u7edf\u8c03\u7528，\u5206\u522b\u7528\u4e8e\u521b\u5efasocket\u3001\u7ed1\u5b9a\u5730\u5740\u3001\u76d1\u542c\u8fde\u63a5\u8bf7\u6c42\u3001\u4e8b\u4ef6\u76d1\u542c\u548c\u63a5\u53d7\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42\u3002\u4e8b\u4ef6\u5faa\u73af\u4e2d\u8c03\u7528 select \u51fd\u6570\u6765\u5224\u65ad\u54ea\u4e9bsocket\u6587\u4ef6\u63cf\u8ff0\u7b26（file descriptor）\u662f"\u53ef\u8bfb"\u7684，\u968f\u540e\u5bf9"\u53ef\u8bfb"\u7684socket\u6267\u884c\u76f8\u5e94\u64cd\u4f5c，\u5982\u63a5\u53d7\u65b0\u7684\u8fde\u63a5\u6216\u8bfb\u53d6\u6570\u636e\u3002 <\/p>\n
\u7f51\u7edc\u7f13\u51b2\u533a\u7684\u7ba1\u7406\u5305\u62ec\u6570\u636e\u5305\u7684\u63a5\u6536\u3001\u7f13\u5b58\u3001\u8bfb\u53d6\u548c\u6e05\u7406\u7b49\u64cd\u4f5c\u3002\u5408\u7406\u7684\u7ba1\u7406\u65b9\u6cd5\u80fd\u591f\u63d0\u9ad8\u7f51\u7edcI\/O\u7684\u6027\u80fd，\u5e76\u51cf\u5c11\u6570\u636e\u4f20\u8f93\u7684\u5ef6\u8fdf\u3002\u7f13\u51b2\u533a\u7ba1\u7406\u901a\u5e38\u6d89\u53ca\u5185\u5b58\u5206\u914d\u3001\u6570\u636e\u5305\u7684\u987a\u5e8f\u63a7\u5236\u4ee5\u53ca\u5185\u5b58\u7684\u91ca\u653e\u3002 <\/p>\n
\u7f13\u51b2\u533a\u7684\u8bbe\u8ba1\u901a\u5e38\u9700\u8981\u8003\u8651\u4ee5\u4e0b\u51e0\u70b9： – \u52a8\u6001\u8c03\u6574\u7f13\u51b2\u533a\u5927\u5c0f\u4ee5\u9002\u5e94\u4e0d\u540c\u7684\u6570\u636e\u6d41\u91cf\u3002 – \u4f7f\u7528\u73af\u5f62\u7f13\u51b2\u533a（ring buffer）\u6765\u5b9e\u73b0\u9ad8\u6548\u7684\u6570\u636e\u5305\u5165\u961f\u548c\u51fa\u961f\u64cd\u4f5c\u3002 – \u4fdd\u8bc1\u6570\u636e\u5305\u7684\u987a\u5e8f\u6027\u548c\u540c\u6b65，\u5c24\u5176\u662f\u5bf9\u4e8eRTP\u6570\u636e\u6d41\u6765\u8bf4，\u6570\u636e\u5305\u7684\u987a\u5e8f\u76f4\u63a5\u5f71\u54cd\u5a92\u4f53\u64ad\u653e\u7684\u8fde\u8d2f\u6027\u3002 <\/p>\n
\/\/ \u73af\u5f62\u7f13\u51b2\u533a\u7684\u7b80\u5355\u5b9e\u73b0
\n#define BUFFER_SIZE 1024<\/p>\n
typedef struct {
\n uint8_t buffer[BUFFER_SIZE];
\n size_t read_pos;
\n size_t write_pos;
\n size_t bytes_used;
\n} RingBuffer;<\/p>\n
\/\/ \u6dfb\u52a0\u6570\u636e\u5230\u7f13\u51b2\u533a
\nvoid ring_buffer_add(RingBuffer* buf, const uint8_t* data, size_t size) {
\n \/\/ \u5faa\u73af\u5199\u5165\u6570\u636e，\u5904\u7406\u7f13\u51b2\u533a\u5927\u5c0f\u9650\u5236\u548c\u73af\u5f62\u7279\u6027
\n \/\/ …
\n}<\/p>\n
\/\/ \u4ece\u7f13\u51b2\u533a\u8bfb\u53d6\u6570\u636e
\nsize_t ring_buffer_read(RingBuffer* buf, uint8_t* data, size_t size) {
\n \/\/ \u5faa\u73af\u8bfb\u53d6\u6570\u636e，\u76f4\u5230size\u9650\u5236\u6216\u7f13\u51b2\u533a\u4e3a\u7a7a
\n \/\/ …
\n}<\/p>\n
\u73af\u5f62\u7f13\u51b2\u533a\u662f\u4e00\u79cd\u5faa\u73af\u961f\u5217\u7684\u5b9e\u73b0\u65b9\u5f0f，\u5728\u7f51\u7edc\u6570\u636e\u5305\u7684\u5904\u7406\u4e2d\u53ef\u4ee5\u6709\u6548\u5730\u51cf\u5c11\u6570\u636e\u5305\u62f7\u8d1d\u548c\u5185\u5b58\u5206\u914d\u7684\u6b21\u6570，\u63d0\u9ad8\u6570\u636e\u5904\u7406\u6548\u7387\u3002 <\/p>\n
\u97f3\u89c6\u9891\u6570\u636e\u6d41\u7684\u5904\u7406\u662f\u591a\u5a92\u4f53\u5e94\u7528\u7684\u6838\u5fc3，\u6d89\u53ca\u5230\u7f16\u89e3\u7801\u5668\u7684\u9009\u62e9\u3001\u7f16\u89e3\u7801\u8fc7\u7a0b\u7684\u6267\u884c\u548c\u6570\u636e\u5305\u7684\u751f\u6210\u3002\u7f16\u89e3\u7801\u8fc7\u7a0b\u901a\u5e38\u5305\u62ec\u5bf9\u539f\u59cb\u6570\u636e\u7684\u538b\u7f29\u7f16\u7801\u4ee5\u53ca\u5bf9\u63a5\u6536\u6570\u636e\u7684\u89e3\u7801\u64ad\u653e\u3002 <\/p>\n
\u4ee5H.264\u89c6\u9891\u7f16\u89e3\u7801\u4e3a\u4f8b，\u7f16\u89e3\u7801\u8fc7\u7a0b\u9700\u8981\u9075\u5faa\u4ee5\u4e0b\u6b65\u9aa4： <\/p>\n
\u89e3\u7801\u8fc7\u7a0b\u5219\u662f\u7f16\u7801\u7684\u9006\u8fc7\u7a0b，\u5373\u4eceRTP\u6570\u636e\u5305\u4e2d\u63d0\u53d6\u538b\u7f29\u7684\u97f3\u89c6\u9891\u6570\u636e，\u4f7f\u7528\u5bf9\u5e94\u7684\u89e3\u7801\u5668\u8fdb\u884c\u89e3\u7801，\u7136\u540e\u8f93\u51fa\u5230\u663e\u793a\u8bbe\u5907\u4e0a\u3002 <\/p>\n
\/\/ \u793a\u4f8b\u4ee3\u7801：H.264\u7f16\u7801\u6d41\u7a0b\u4f2a\u4ee3\u7801<\/p>\n
void encode_frame(uint8_t* raw_frame_data, size_t frame_size, …) {
\n \/\/ \u521d\u59cb\u5316\u7f16\u7801\u5668\u53c2\u6570
\n \/\/ …<\/p>\n
\/\/ \u5f00\u59cb\u7f16\u7801
\n int ret = avcodec_send_frame(encoder_ctx, frame);
\n while (ret >= 0) {
\n AVPacket packet;
\n ret = avcodec_receive_packet(encoder_ctx, &packet);
\n if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
\n break;
\n } else if (ret < 0) {
\n \/\/ \u7f16\u7801\u9519\u8bef\u5904\u7406
\n \/\/ …
\n }<\/p>\n
\/\/ \u5c06\u7f16\u7801\u540e\u7684\u6570\u636e\u5c01\u88c5\u5230RTP\u5305
\n \/\/ …
\n }
\n}<\/p>\n
\u97f3\u89c6\u9891\u540c\u6b65\u662f\u786e\u4fdd\u64ad\u653e\u8d28\u91cf\u7684\u5173\u952e\u90e8\u5206\u3002\u5728\u591a\u5a92\u4f53\u6570\u636e\u6d41\u4e2d，\u97f3\u9891\u548c\u89c6\u9891\u662f\u5206\u5f00\u4f20\u8f93\u7684，\u56e0\u6b64\u9700\u8981\u4e00\u4e2a\u673a\u5236\u6765\u4fdd\u8bc1\u4e24\u8005\u5728\u64ad\u653e\u65f6\u7684\u540c\u6b65\u3002 <\/p>\n
\u97f3\u89c6\u9891\u540c\u6b65\u7684\u4e3b\u8981\u7b56\u7565\u5305\u62ec： <\/p>\n
\/\/ \u793a\u4f8b\u4ee3\u7801：\u97f3\u89c6\u9891\u540c\u6b65\u4f2a\u4ee3\u7801<\/p>\n
\/\/ RTP\u65f6\u95f4\u6233\u7528\u4e8e\u540c\u6b65\u97f3\u89c6\u9891\u6570\u636e\u5305
\n\/\/ audioPTS \u548c videoPTS \u5206\u522b\u4e3a\u97f3\u9891\u548c\u89c6\u9891\u6570\u636e\u5305\u7684\u65f6\u95f4\u6233<\/p>\n
if (abs(audioPTS – videoPTS) > SOME_THRESHOLD) {
\n \/\/ \u65f6\u95f4\u6233\u5dee\u5f02\u8fc7\u5927，\u8c03\u6574\u89c6\u9891\u64ad\u653e\u901f\u5ea6
\n adjust_video_playback_speed();
\n} else {
\n \/\/ \u65f6\u95f4\u6233\u5dee\u5f02\u5728\u53ef\u63a5\u53d7\u8303\u56f4\u5185，\u6b63\u5e38\u64ad\u653e
\n play_audio_video();
\n}<\/p>\n
\u540c\u6b65\u673a\u5236\u7684\u5b9e\u73b0\u4f1a\u6839\u636e\u5177\u4f53\u7684\u7f16\u89e3\u7801\u683c\u5f0f\u548c\u64ad\u653e\u73af\u5883\u6709\u6240\u4e0d\u540c，\u4f46\u6838\u5fc3\u601d\u60f3\u662f\u4fdd\u8bc1\u97f3\u89c6\u9891\u6570\u636e\u5305\u5728\u64ad\u653e\u65f6\u8fbe\u5230\u540c\u6b65\u72b6\u6001\u3002 <\/p>\n
\u4e3a\u4e86\u786e\u4fdd\u5a92\u4f53\u6d41\u4f20\u8f93\u7684\u5b89\u5168\u6027，\u6e90\u7801\u5b9e\u73b0\u4e2d\u9700\u8981\u5305\u542b\u8ba4\u8bc1\u6388\u6743\u673a\u5236\u3002\u4e00\u4e2a\u5e38\u89c1\u7684\u505a\u6cd5\u662f\u4f7f\u7528RTSP\u7684\u8ba4\u8bc1\u673a\u5236，\u4f8b\u5982\u57fa\u672c\u8ba4\u8bc1（Basic Authentication）\u6216\u6458\u8981\u8ba4\u8bc1（Digest Authentication）\u3002 <\/p>\n
\u57fa\u672c\u8ba4\u8bc1\u8981\u6c42\u5ba2\u6237\u7aef\u5728\u8bf7\u6c42\u4e2d\u53d1\u9001\u7ecf\u8fc7Base64\u7f16\u7801\u7684\u7528\u6237\u540d\u548c\u5bc6\u7801，\u800c\u6458\u8981\u8ba4\u8bc1\u5219\u66f4\u4e3a\u590d\u6742，\u6d89\u53ca\u751f\u6210\u968f\u673a\u6570（nonce）\u3001\u6458\u8981\u503c（HMAC）\u7684\u8ba1\u7b97\u7b49\u3002 <\/p>\n
\/\/ \u793a\u4f8b\u4ee3\u7801：\u57fa\u672c\u8ba4\u8bc1\u5904\u7406\u4f2a\u4ee3\u7801<\/p>\n
\/\/ \u4ece\u8bf7\u6c42\u5934\u4e2d\u89e3\u6790\u51fa\u7528\u6237\u540d\u548c\u5bc6\u7801
\nchar* username;
\nchar* password;
\nparse_credentials_from_request(&username, &password);<\/p>\n
\/\/ \u5bf9\u7528\u6237\u540d\u548c\u5bc6\u7801\u8fdb\u884cBase64\u89e3\u7801
\nchar decoded_username[USERNAME_LEN];
\nchar decoded_password[PASSWORD_LEN];
\nbase64_decode(username, decoded_username);
\nbase64_decode(password, decoded_password);<\/p>\n
\/\/ \u9a8c\u8bc1\u7528\u6237\u540d\u548c\u5bc6\u7801
\nif (authenticate(username, password)) {
\n \/\/ \u8ba4\u8bc1\u6210\u529f
\n allow_request();
\n} else {
\n \/\/ \u8ba4\u8bc1\u5931\u8d25
\n deny_request();
\n}<\/p>\n
\u9664\u4e86\u8ba4\u8bc1\u6388\u6743\u673a\u5236，\u6570\u636e\u52a0\u5bc6\u4e5f\u662f\u4fdd\u969c\u4f20\u8f93\u5b89\u5168\u7684\u91cd\u8981\u63aa\u65bd\u3002\u5728\u5a92\u4f53\u6d41\u4f20\u8f93\u4e2d，SSL\/TLS\u534f\u8bae\u5e38\u88ab\u7528\u6765\u52a0\u5bc6RTSP\u548cRTP\u6570\u636e\u5305\u3002 <\/p>\n
SSL\/TLS\u534f\u8bae\u63d0\u4f9b\u6570\u636e\u52a0\u5bc6\u3001\u8eab\u4efd\u9a8c\u8bc1\u548c\u6570\u636e\u5b8c\u6574\u6027\u6821\u9a8c，\u786e\u4fdd\u6570\u636e\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u7684\u5b89\u5168\u3002\u5728\u6e90\u7801\u4e2d\u5b9e\u73b0SSL\/TLS\u52a0\u5bc6\u6d89\u53ca\u5230\u4f7f\u7528\u76f8\u5e94\u7684\u5e93\u51fd\u6570，\u5982OpenSSL，\u6765\u521d\u59cb\u5316SSL\u4e0a\u4e0b\u6587\u3001\u5904\u7406SSL\u63e1\u624b\u8fc7\u7a0b\u4ee5\u53ca\u52a0\u5bc6\u89e3\u5bc6\u4f20\u8f93\u6570\u636e\u3002 <\/p>\n
\/\/ \u793a\u4f8b\u4ee3\u7801：SSL\/TLS\u52a0\u5bc6\u4f20\u8f93\u4f2a\u4ee3\u7801<\/p>\n
\/\/ \u521d\u59cb\u5316SSL\u4e0a\u4e0b\u6587
\nSSL_CTX* ctx = SSL_CTX_new(SSLv23_server_method());
\nSSL_CTX_use_certificate_file(ctx, "server.crt", SSL_FILETYPE_PEM);
\nSSL_CTX_use_PrivateKey_file(ctx, "server.key", SSL_FILETYPE_PEM);<\/p>\n
\/\/ \u63a5\u53d7\u65b0\u8fde\u63a5\u5e76\u521d\u59cb\u5316SSL\u7ed3\u6784\u4f53
\nSSL* ssl = SSL_new(ctx);
\nBIO* bio = BIO_new_ssl_connect(ctx);
\nBIO_set_conn_hostname(bio, "ssl:\/\/client:443");<\/p>\n
\/\/ \u8fdb\u884cSSL\u63e1\u624b，\u534f\u5546\u52a0\u5bc6\u53c2\u6570
\nSSL_set_bio(ssl, bio, bio);
\nint ret = SSL_accept(ssl);
\nif (ret <= 0) {
\n \/\/ SSL\u63e1\u624b\u5931\u8d25\u5904\u7406
\n \/\/ …
\n}<\/p>\n
\/\/ \u52a0\u5bc6\u6570\u636e\u4f20\u8f93
\nwhile (SSL_read(ssl, buffer, sizeof(buffer)) > 0) {
\n \/\/ \u5904\u7406\u63a5\u6536\u5230\u7684\u6570\u636e
\n}<\/p>\n
\/\/ \u5173\u95edSSL\u8fde\u63a5
\nSSL_shutdown(ssl);
\nSSL_free(ssl);
\nSSL_CTX_free(ctx);<\/p>\n
SSL\/TLS\u7684\u5b9e\u73b0\u7ec6\u8282\u975e\u5e38\u590d\u6742，\u4e0a\u8ff0\u4ee3\u7801\u4ec5\u5c55\u793a\u4e86\u57fa\u672c\u7684SSL\/TLS\u4e0a\u4e0b\u6587\u521d\u59cb\u5316\u548c\u63e1\u624b\u8fc7\u7a0b，\u5b9e\u9645\u5f00\u53d1\u4e2d\u9700\u8981\u5904\u7406\u66f4\u591a\u7684\u7ec6\u8282，\u5982\u9519\u8bef\u5904\u7406\u3001\u91cd\u63e1\u624b\u7b56\u7565\u7b49\u3002 <\/p>\n
\u5728\u8fd9\u4e00\u7ae0\u8282\u4e2d，\u6211\u4eec\u5c06\u6df1\u5165\u4e86\u89e3\u5982\u4f55\u51c6\u5907\u548c\u6267\u884c rtsp_server \u6e90\u7801\u7684\u7f16\u8bd1\u4e0e\u8fd0\u884c\u3002\u8fd9\u4e00\u8fc7\u7a0b\u5bf9\u4e8eIT\u4e13\u4e1a\u4eba\u5458\u6765\u8bf4\u662f\u81f3\u5173\u91cd\u8981\u7684，\u56e0\u4e3a\u7406\u89e3\u6e90\u7801\u7684\u7f16\u8bd1\u548c\u8fd0\u884c\u673a\u5236\u662f\u8fdb\u884c\u5b9a\u5236\u5316\u5f00\u53d1\u548c\u95ee\u9898\u6392\u67e5\u7684\u57fa\u77f3\u3002 <\/p>\n
\u4e3a\u4e86\u786e\u4fdd\u7f16\u8bd1\u8fc7\u7a0b\u987a\u5229\u8fdb\u884c，\u9996\u5148\u9700\u8981\u642d\u5efa\u4e00\u4e2a\u5408\u9002\u7684\u5f00\u53d1\u73af\u5883\u3002\u8fd9\u5305\u62ec\u5b89\u88c5\u5fc5\u8981\u7684\u4f9d\u8d56\u5e93\u4ee5\u53ca\u914d\u7f6e\u5f00\u53d1\u5de5\u5177\u3002 <\/p>\n
\u4f9d\u8d56\u5e93\u662f\u6784\u5efa\u9879\u76ee\u7684\u57fa\u7840，\u7f3a\u4e4f\u4efb\u4f55\u4e00\u4e2a\u90fd\u53ef\u80fd\u5bfc\u81f4\u7f16\u8bd1\u5931\u8d25\u3002\u5bf9\u4e8e rtsp_server \u8fd9\u6837\u7684\u9879\u76ee\u6765\u8bf4，\u5e38\u89c1\u7684\u4f9d\u8d56\u5305\u62ec\u4f46\u4e0d\u9650\u4e8e\u4ee5\u4e0b\u51e0\u4e2a： <\/p>\n
\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u547d\u4ee4\u5b89\u88c5\u8fd9\u4e9b\u4f9d\u8d56\u5e93（\u4ee5Ubuntu\u7cfb\u7edf\u4e3a\u4f8b）： <\/p>\n
sudo apt-get update
\nsudo apt-get install libssl-dev libevent-dev ffmpeg libavcodec-dev libavformat-dev<\/p>\n
\u786e\u4fdd\u5b89\u88c5\u4e86\u652f\u6301C\/C++\u7684\u7f16\u8bd1\u5668，\u5982 gcc \u548c g++ \u3002\u6b64\u5916，\u5bf9\u4e8e\u6e90\u7801\u7ba1\u7406，\u4f7f\u7528 git \u662f\u975e\u5e38\u666e\u904d\u7684\u505a\u6cd5\u3002\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u547d\u4ee4\u6765\u5b89\u88c5\u8fd9\u4e9b\u5de5\u5177： <\/p>\n
sudo apt-get install build-essential git<\/p>\n
\u5b8c\u6210\u73af\u5883\u5b89\u88c5\u540e，\u6211\u4eec\u53ef\u4ee5\u5f00\u59cb\u4ece\u6e90\u7801\u5e93\u514b\u9686\u9879\u76ee\u4ee3\u7801： <\/p>\n
git clone <rtsp_server_repo_url><\/p>\n
\u6e90\u7801\u7f16\u8bd1\u662f\u5c06\u6e90\u4ee3\u7801\u6587\u4ef6\u8f6c\u6362\u4e3a\u53ef\u6267\u884c\u6587\u4ef6\u7684\u8fc7\u7a0b\u3002\u5728\u8fd9\u4e00\u90e8\u5206，\u6211\u4eec\u5c06\u8be6\u7ec6\u63a2\u8ba8\u5982\u4f55\u914d\u7f6e\u7f16\u8bd1\u9009\u9879，\u5e76\u8fdb\u884c\u5b89\u88c5\u3002 <\/p>\n
\u7f16\u8bd1\u5668\u914d\u7f6e\u9009\u9879\u5bf9\u4e8e\u9879\u76ee\u7684\u6027\u80fd\u548c\u529f\u80fd\u6709\u7740\u91cd\u8981\u5f71\u54cd\u3002\u5728 rtsp_server \u9879\u76ee\u4e2d，\u53ef\u4ee5\u901a\u8fc7 .\/configure \u811a\u672c\u6765\u8fdb\u884c\u7f16\u8bd1\u914d\u7f6e： <\/p>\n
.\/configure –prefix=<installation_path><\/p>\n
\u8fd9\u91cc\u7684 <installation_path> \u6307\u5b9a\u4e86\u5b89\u88c5\u76ee\u5f55，\u5982\u679c\u4e0d\u8bbe\u7f6e，\u9ed8\u8ba4\u4f1a\u5728 \/usr\/local \u4e0b\u5b89\u88c5\u3002\u6267\u884c\u6b64\u547d\u4ee4\u540e，\u811a\u672c\u4f1a\u68c0\u67e5\u7cfb\u7edf\u73af\u5883\u5e76\u751f\u6210\u9002\u5408\u5f53\u524d\u7cfb\u7edf\u7684Makefile\u3002 <\/p>\n
\u4e00\u65e6\u6709\u4e86\u6b63\u786e\u7684Makefile，\u6211\u4eec\u5c31\u53ef\u4ee5\u4f7f\u7528 make \u547d\u4ee4\u6765\u7f16\u8bd1\u9879\u76ee： <\/p>\n
make<\/p>\n
\u7f16\u8bd1\u5b8c\u6210\u540e，\u4f7f\u7528 make install \u547d\u4ee4\u6765\u5b89\u88c5\u7a0b\u5e8f： <\/p>\n
sudo make install<\/p>\n
\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d，\u53ef\u80fd\u4f1a\u9047\u5230\u4f9d\u8d56\u7f3a\u5931\u3001\u7f16\u8bd1\u9519\u8bef\u7b49\u95ee\u9898\u3002\u89e3\u51b3\u65b9\u6848\u901a\u5e38\u5305\u62ec\u5b89\u88c5\u7f3a\u5931\u7684\u4f9d\u8d56\u3001\u68c0\u67e5\u7f16\u8bd1\u5668\u7248\u672c\u548c\u6743\u9650\u8bbe\u7f6e\u7b49\u3002 <\/p>\n
\u7f16\u8bd1\u5b89\u88c5\u5b8c\u6210\u540e，\u6211\u4eec\u8fd8\u9700\u8981\u6839\u636e\u5b9e\u9645\u9700\u6c42\u5bf9\u914d\u7f6e\u6587\u4ef6\u8fdb\u884c\u4fee\u6539，\u5e76\u638c\u63e1\u5982\u4f55\u6b63\u786e\u542f\u52a8\u670d\u52a1\u3002 <\/p>\n
rtsp_server \u901a\u5e38\u5e26\u6709\u4e00\u4e9b\u9ed8\u8ba4\u914d\u7f6e\u6587\u4ef6，\u4f4d\u4e8e\u5b89\u88c5\u76ee\u5f55\u4e0b\u7684 conf \u6587\u4ef6\u5939\u4e2d\u3002\u7f16\u8f91\u8fd9\u4e9b\u6587\u4ef6\u6765\u6ee1\u8db3\u7279\u5b9a\u9700\u6c42： <\/p>\n
nano \/path\/to\/rtsp_server\/conf\/server.conf<\/p>\n
\u4fee\u6539\u914d\u7f6e\u6587\u4ef6\u65f6，\u9700\u8981\u7279\u522b\u6ce8\u610f\u7aef\u53e3\u53f7\u3001\u65e5\u5fd7\u7ea7\u522b\u3001\u5a92\u4f53\u8def\u5f84\u7b49\u53c2\u6570\u7684\u8bbe\u5b9a\u3002 <\/p>\n
\u542f\u52a8\u670d\u52a1\u524d，\u786e\u4fdd\u914d\u7f6e\u6587\u4ef6\u8def\u5f84\u6b63\u786e\u65e0\u8bef\u3002\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u547d\u4ee4\u542f\u52a8 rtsp_server ： <\/p>\n
rtsp_server -c \/path\/to\/rtsp_server\/conf\/server.conf<\/p>\n
\u5982\u679c\u9700\u8981\u8c03\u8bd5，\u53ef\u4ee5\u4f7f\u7528 -d \u53c2\u6570\u6765\u5f00\u542f\u8c03\u8bd5\u6a21\u5f0f： <\/p>\n
rtsp_server -d -c \/path\/to\/rtsp_server\/conf\/server.conf<\/p>\n
\u8c03\u8bd5\u6a21\u5f0f\u80fd\u591f\u8f93\u51fa\u66f4\u8be6\u7ec6\u7684\u65e5\u5fd7\u4fe1\u606f，\u5bf9\u4e8e\u95ee\u9898\u8bca\u65ad\u975e\u5e38\u6709\u7528\u3002 <\/p>\n
\u5728\u4e0b\u4e00\u7ae0\u8282\u4e2d，\u6211\u4eec\u5c06\u8ba8\u8bba\u5982\u4f55\u8fdb\u884c\u6e90\u7801\u8c03\u8bd5\u548c\u6d4b\u8bd5，\u8fd9\u5bf9\u4e8e\u4fdd\u8bc1 rtsp_server \u7684\u7a33\u5b9a\u8fd0\u884c\u81f3\u5173\u91cd\u8981\u3002 <\/p>\n
\u672c\u6587\u8fd8\u6709\u914d\u5957\u7684\u7cbe\u54c1\u8d44\u6e90，\u70b9\u51fb\u83b7\u53d6 <\/p>\n
\u7b80\u4ecb：RTSP（\u5b9e\u65f6\u6d41\u5a92\u4f53\u534f\u8bae）\u670d\u52a1\u5668\u5141\u8bb8\u5ba2\u6237\u7aef\u63a7\u5236\u548c\u540c\u6b65\u591a\u5a92\u4f53\u6570\u636e\u7684\u4f20\u8f93\u3002\u672c\u6587\u5c06\u8be6\u89e3\u4e00\u4e2aC\u8bed\u8a00\u5b9e\u73b0\u7684"rtsp_server"\u6e90\u7801，\u6db5\u76d6\u57fa\u7840\u6982\u5ff5\u3001\u6e90\u7801\u7ed3\u6784\u3001RTSP\u8bf7\u6c42\u5904\u7406\u3001RTP\/RTCP\u534f\u8bae\u5e94\u7528\u3001\u5b9e\u73b0\u7ec6\u8282\u3001\u7f16\u8bd1\u8fd0\u884c\u4ee5\u53ca\u8c03\u8bd5\u6d4b\u8bd5\u7b49\u73af\u8282，\u65e8\u5728\u5e2e\u52a9\u7406\u89e3RTSP\u670d\u52a1\u5668\u7684\u5de5\u4f5c\u539f\u7406\u548c\u5b9e\u73b0\u65b9\u6cd5，\u63d0\u5347\u7f51\u7edc\u670d\u52a1\u5f00\u53d1\u6280\u80fd\u3002 <\/p>\n
\u672c\u6587\u8fd8\u6709\u914d\u5957\u7684\u7cbe\u54c1\u8d44\u6e90，\u70b9\u51fb\u83b7\u53d6 <\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1.8k\u6b21\uff0c\u70b9\u8d5e27\u6b21\uff0c\u6536\u85cf30\u6b21\u3002\u672c\u6587\u8fd8\u6709\u914d\u5957\u7684\u7cbe\u54c1\u8d44\u6e90\uff0c\u70b9\u51fb\u83b7\u53d6 \u7b80\u4ecb\uff1aRTSP\uff08\u5b9e\u65f6\u6d41\u5a92\u4f53\u534f\u8bae\uff09\u670d\u52a1\u5668\u5141\u8bb8\u5ba2\u6237\u7aef\u63a7\u5236\u548c\u540c\u6b65\u591a\u5a92\u4f53\u6570\u636e\u7684\u4f20\u8f93\u3002\u672c\u6587\u5c06\u8be6\u89e3\u4e00\u4e2aC\u8bed\u8a00\u5b9e\u73b0\u7684"rtsp_server"\u6e90\u7801\uff0c\u6db5\u76d6\u57fa\u7840\u6982\u5ff5\u3001\u6e90\u7801\u7ed3\u6784\u3001RTSP\u8bf7\u6c42\u5904\u7406\u3001RTP\/RTCP\u534f\u8bae\u5e94\u7528\u3001\u5b9e\u73b0\u7ec6\u8282\u3001\u7f16\u8bd1\u8fd0\u884c\u4ee5\u53ca\u8c03\u8bd5\u6d4b\u8bd5\u7b49\u73af\u8282\uff0c\u65e8\u5728\u5e2e\u52a9\u7406\u89e3RTSP\u670d\u52a1\u5668\u7684\u5de5\u4f5c\u539f\u7406\u548c\u5b9e\u73b0\u65b9\u6cd5\uff0c\u63d0\u5347\u7f51\u7edc\u670d\u52a1\u5f00\u53d1\u6280\u80fd\u3002 1. RTSP\u534f\u8bae\u57fa…_rtsp\u6e90\u7801<\/p>\n","protected":false},"author":2,"featured_media":19005,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"topic":[],"class_list":["post-19007","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server"],"yoast_head":"\n