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PJSIP学习笔记——从simple_pjsua.c示例程序了解PJSUA-LIB的基本使用流程

2013-08-29 15:43 741 查看
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

[cpp]
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/*
* main()
*
* argv[1] may contain URL to call.
*/
int main(int argc, char *argv[])
{
pjsua_acc_id acc_id;
pj_status_t status;

// 创建PJSIP
/* Create pjsua first! */
status = pjsua_create();
if (status != PJ_SUCCESS) error_exit("Error in pjsua_create()", status);

// 校验被叫SIP地址是否正确
/* If argument is specified, it's got to be a valid SIP URL */
if (argc > 1) {
status = pjsua_verify_url(argv[1]);
if (status != PJ_SUCCESS) error_exit("Invalid URL in argv", status);
}

// 初始化PJSUA,设置回调函数
/* Init pjsua */
{
pjsua_config cfg;
pjsua_logging_config log_cfg;

pjsua_config_default(&cfg);
cfg.cb.on_incoming_call = &on_incoming_call;
cfg.cb.on_call_media_state = &on_call_media_state;
cfg.cb.on_call_state = &on_call_state;

pjsua_logging_config_default(&log_cfg);
log_cfg.console_level = 4;

status = pjsua_init(&cfg, &log_cfg, NULL);
if (status != PJ_SUCCESS) error_exit("Error in pjsua_init()", status);
}

// 创建PJSIP的传输端口
/* Add UDP transport. */
{
pjsua_transport_config cfg;

pjsua_transport_config_default(&cfg);
cfg.port = 5060;
status = pjsua_transport_create(PJSIP_TRANSPORT_UDP, &cfg, NULL);
if (status != PJ_SUCCESS) error_exit("Error creating transport", status);
}

// 启动PJSIP
/* Initialization is done, now start pjsua */
status = pjsua_start();
if (status != PJ_SUCCESS) error_exit("Error starting pjsua", status);

// 设置SIP用户帐号
/* Register to SIP server by creating SIP account. */
{
pjsua_acc_config cfg;

pjsua_acc_config_default(&cfg);
cfg.id = pj_str("sip:" SIP_USER "@" SIP_DOMAIN);
cfg.reg_uri = pj_str("sip:" SIP_DOMAIN);
cfg.cred_count = 1;
cfg.cred_info[0].realm = pj_str(SIP_DOMAIN);
cfg.cred_info[0].scheme = pj_str("digest");
cfg.cred_info[0].username = pj_str(SIP_USER);
cfg.cred_info[0].data_type = PJSIP_CRED_DATA_PLAIN_PASSWD;
cfg.cred_info[0].data = pj_str(SIP_PASSWD);

status = pjsua_acc_add(&cfg, PJ_TRUE, &acc_id);
if (status != PJ_SUCCESS) error_exit("Error adding account", status);
}

// 发起一个呼叫
/* If URL is specified, make call to the URL. */
if (argc > 1) {
pj_str_t uri = pj_str(argv[1]);
status = pjsua_call_make_call(acc_id, &uri, 0, NULL, NULL, NULL);
if (status != PJ_SUCCESS) error_exit("Error making call", status);
}

// 循环等待
/* Wait until user press "q" to quit. */
for (;;) {
char option[10];

puts("Press 'h' to hangup all calls, 'q' to quit");
if (fgets(option, sizeof(option), stdin) == NULL) {
puts("EOF while reading stdin, will quit now..");
break;
}

if (option[0] == 'q')
break;

if (option[0] == 'h')
pjsua_call_hangup_all();
}

/* Destroy pjsua */
pjsua_destroy();

return 0;
}

来电的回调函数

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//来电回调函数
/* Callback called by the library upon receiving incoming call */
static void on_incoming_call(pjsua_acc_id acc_id, pjsua_call_id call_id,
pjsip_rx_data *rdata)
{
pjsua_call_info ci;

PJ_UNUSED_ARG(acc_id);
PJ_UNUSED_ARG(rdata);

// 获得呼叫信息
pjsua_call_get_info(call_id, &ci);

PJ_LOG(3,(THIS_FILE, "Incoming call from %.*s!!",
(int)ci.remote_info.slen,
ci.remote_info.ptr));

// 自动应答呼叫
/* Automatically answer incoming calls with 200/OK */
pjsua_call_answer(call_id, 200, NULL, NULL);
}

呼叫状态改变的回调函数,没有做实质性的操作:

[cpp]
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//呼叫状态改变的回调函数
/* Callback called by the library when call's state has changed */
static void on_call_state(pjsua_call_id call_id, pjsip_event *e)
{
pjsua_call_info ci;

PJ_UNUSED_ARG(e);

pjsua_call_get_info(call_id, &ci);
PJ_LOG(3,(THIS_FILE, "Call %d state=%.*s", call_id,
(int)ci.state_text.slen,
ci.state_text.ptr));
}

媒体状态改变的回调函数:

[cpp]
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//媒体状态改变的回调函数
/* Callback called by the library when call's media state has changed */
static void on_call_media_state(pjsua_call_id call_id)
{
pjsua_call_info ci;

pjsua_call_get_info(call_id, &ci);

// 当媒体为激活时,连接呼叫和声音设备
if (ci.media_status == PJSUA_CALL_MEDIA_ACTIVE) {
// When media is active, connect call to sound device.
pjsua_conf_connect(ci.conf_slot, 0);
pjsua_conf_connect(0, ci.conf_slot);
}
}
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