文档
可以查看exosip osip的在线文档
http://www.antisip.com/doc/
在线文档 一般先看mainpage 会有库的一个整体说明。
其次看看 modules 会有一些使用说明。
exosip是对osip的封装 使用osip简单好用。 osip主要包括sip sdp 协议的解析 fmt 无限状态机 实现sip协议的会话状态(这个没有太深入理解) 其次还包括了对不同平台的线程 锁信号的封装实现跨平台。
osip 源代码框架详解
https://wenku.baidu.com/view/49462441be1e650e52ea9940.html?sxts=1557060265157
https://wenku.baidu.com/view/7cc81930b90d6c85ec3ac6de.html?rec_flag=default
https://wenku.baidu.com/view/f7988a6b011ca300a6c390ab.html
* osip 开发手册
https://wenku.baidu.com/view/fe5ccbebe009581b6bd9eb18.html?sxts=1557122790420
* osip 状态机的解释(ICT IST NICT NIST)
https://blog.csdn.net/candy1232009/article/details/3926868
https://blog.csdn.net/lbc2100/article/details/48342889
osip sdp 的操作
void sdpTest() { char *sdpStr = "v=0 " "o=- 3761910912 3761910915 IN IP4 47.112.105.194 " "s=butelmedia " "t=0 0 " "m=audio 5061 RTP/AVP 98 97 99 0 8 " "c=IN IP4 61.149.194.174 " "a=sendrecv " "a=rtpmap:98 speex/16000 " "a=rtpmap:97 speex/8000 " "a=rtpmap:99 speex/32000 " "a=rtpmap:0 PCMU/8000 " "a=rtpmap:8 PCMA/8000 " "a=ssrc:2066561799 cname:30000025 " "a=mid:audio-1 " "a=rtcp-mux " "a=audiodesc:mic_audio " "m=video 5061 RTP/AVP 97 " "c=IN IP4 61.149.194.174 " "a=sendrecv " "a=rtpmap:97 H264/90000 " "a=fmtp:97 profile-level-id=42e01e; packetization-mode=1 " "a=ssrc:931412768 cname:30000025 " "a=mid:video-1 " "a=rtcp-mux " "a=videodesc:camera " ; int ret = 0; sdp_message_t *sdp = NULL; char *pChar = NULL; ret = sdp_message_init (&sdp); if(0!=ret) { printf("sdp_message_init error %d ",ret); return; } ret = sdp_message_parse (sdp, sdpStr); if(0!=ret) { printf("parse error %d ",ret); return; } pChar = sdp_message_a_att_field_get(sdp,0,0); if (pChar) printf("%s ",pChar); int size = strlen("sendonly"); char * send = (char *)osip_malloc(size); memcpy(send,"sendonly",size); ret = sdp_message_a_attribute_add (sdp, 0, send, NULL); printf("sdp_message_a_attribute_add %d ",ret); ret = sdp_message_a_attribute_del (sdp, 0, "sendrecv"); printf("sdp_message_a_attribute_del %d ",ret); ret = sdp_message_to_str(sdp,&pChar); if(0!=ret) { printf("sdp_message_to_str %d ",ret); return; } printf("sdp_message_to_str: %s ",pChar); osip_free(pChar); sdp_message_free(sdp); }
备注: 添加到sdp_message_t 的信息 需要动态分配的信息 因为 sdp_message_free 会释放