原文地址:http://blog.csdn.net/sukhoi27smk/article/details/10525011
要了解pjsip的使用,simple_pjsua.c是一个很好的例子,虽然代码只有短短的172行,却展示了pjsua-lib层的完整使用流程、注册流程和基本呼叫流程。
下面是学习过程中整理的simple_pjsua.c中的main函数主要流程:
先来看看pjsip-apps/src/samples/simple_pjsua.c的main函数
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int main(int argc, char *argv[])
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{
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pjsua_acc_id acc_id;
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pj_status_t status;
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status = pjsua_create();
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if (status != PJ_SUCCESS) error_exit("Error in pjsua_create()", status);
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if (argc > 1) {
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status = pjsua_verify_url(argv[1]);
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if (status != PJ_SUCCESS) error_exit("Invalid URL in argv", status);
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}
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{
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pjsua_config cfg;
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pjsua_logging_config log_cfg;
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pjsua_config_default(&cfg);
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cfg.cb.on_incoming_call = &on_incoming_call;
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cfg.cb.on_call_media_state = &on_call_media_state;
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cfg.cb.on_call_state = &on_call_state;
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pjsua_logging_config_default(&log_cfg);
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log_cfg.console_level = 4;
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status = pjsua_init(&cfg, &log_cfg, NULL);
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if (status != PJ_SUCCESS) error_exit("Error in pjsua_init()", status);
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}
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{
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pjsua_transport_config cfg;
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pjsua_transport_config_default(&cfg);
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cfg.port = 5060;
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status = pjsua_transport_create(PJSIP_TRANSPORT_UDP, &cfg, NULL);
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if (status != PJ_SUCCESS) error_exit("Error creating transport", status);
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}
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status = pjsua_start();
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if (status != PJ_SUCCESS) error_exit("Error starting pjsua", status);
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{
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pjsua_acc_config cfg;
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pjsua_acc_config_default(&cfg);
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cfg.id = pj_str("sip:" SIP_USER "@" SIP_DOMAIN);
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cfg.reg_uri = pj_str("sip:" SIP_DOMAIN);
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cfg.cred_count = 1;
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cfg.cred_info[0].realm = pj_str(SIP_DOMAIN);
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cfg.cred_info[0].scheme = pj_str("digest");
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cfg.cred_info[0].username = pj_str(SIP_USER);
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cfg.cred_info[0].data_type = PJSIP_CRED_DATA_PLAIN_PASSWD;
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cfg.cred_info[0].data = pj_str(SIP_PASSWD);
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status = pjsua_acc_add(&cfg, PJ_TRUE, &acc_id);
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if (status != PJ_SUCCESS) error_exit("Error adding account", status);
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}
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if (argc > 1) {
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pj_str_t uri = pj_str(argv[1]);
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status = pjsua_call_make_call(acc_id, &uri, 0, NULL, NULL, NULL);
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if (status != PJ_SUCCESS) error_exit("Error making call", status);
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}
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for (;;) {
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char option[10];
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puts("Press 'h' to hangup all calls, 'q' to quit");
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if (fgets(option, sizeof(option), stdin) == NULL) {
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puts("EOF while reading stdin, will quit now..");
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break;
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}
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if (option[0] == 'q')
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break;
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if (option[0] == 'h')
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pjsua_call_hangup_all();
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}
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pjsua_destroy();
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return 0;
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}
来电的回调函数
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static void on_incoming_call(pjsua_acc_id acc_id, pjsua_call_id call_id,
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pjsip_rx_data *rdata)
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{
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pjsua_call_info ci;
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PJ_UNUSED_ARG(acc_id);
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PJ_UNUSED_ARG(rdata);
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pjsua_call_get_info(call_id, &ci);
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PJ_LOG(3,(THIS_FILE, "Incoming call from %.*s!!",
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(int)ci.remote_info.slen,
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ci.remote_info.ptr));
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pjsua_call_answer(call_id, 200, NULL, NULL);
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}
呼叫状态改变的回调函数,没有做实质性的操作:
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static void on_call_state(pjsua_call_id call_id, pjsip_event *e)
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{
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pjsua_call_info ci;
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PJ_UNUSED_ARG(e);
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pjsua_call_get_info(call_id, &ci);
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PJ_LOG(3,(THIS_FILE, "Call %d state=%.*s", call_id,
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(int)ci.state_text.slen,
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ci.state_text.ptr));
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}
媒体状态改变的回调函数:
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static void on_call_media_state(pjsua_call_id call_id)
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{
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pjsua_call_info ci;
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pjsua_call_get_info(call_id, &ci);
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if (ci.media_status == PJSUA_CALL_MEDIA_ACTIVE) {
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pjsua_conf_connect(ci.conf_slot, 0);
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pjsua_conf_connect(0, ci.conf_slot);
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}
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}
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