pjsua.h

基于sip协议的网络电话源码

/* $Id: pjsua.h 1122 2007-04-02 11:22:49Z bennylp $ */
/* 
 * Copyright (C) 2003-2007 Benny Prijono <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
 */
#ifndef __PJSUA_H__
#define __PJSUA_H__

/**
 * @file pjsua.h
 * @brief PJSUA API.
 */


/* Include all PJSIP core headers. */
#include <pjsip.h>

/* Include all PJMEDIA headers. */
#include <pjmedia.h>

/* Include all PJMEDIA-CODEC headers. */
#include <pjmedia-codec.h>

/* Include all PJSIP-UA headers */
#include <pjsip_ua.h>

/* Include all PJSIP-SIMPLE headers */
#include <pjsip_simple.h>

/* Include all PJLIB-UTIL headers. */
#include <pjlib-util.h>

/* Include all PJLIB headers. */
#include <pjlib.h>


PJ_BEGIN_DECL


/**
 * @defgroup PJSUA_LIB PJSUA API - High Level Softphone API for C/C++ and Python
 * @ingroup PJSIP
 * @brief Very high level API for constructing SIP UA applications.
 * @{
 *
 * @section pjsua_api_intro A SIP User Agent API for C/C++ and Python
 *
 * PJSUA API is very high level API, available for C/C++ and Python language,
 * for constructing SIP multimedia user agent
 * applications. It wraps together the signaling and media functionalities
 * into an easy to use call API, provides account management, buddy
 * management, presence, instant messaging, along with multimedia
 * features such as conferencing, file streaming, local playback,
 * voice recording, and so on.
 *
 * @subsection pjsua_for_c_cpp C/C++ Binding
 * Application must link with <b>pjsua-lib</b> to use this API. In addition,
 * this library depends on the following libraries:
 *  - <b>pjsip-ua</b>, 
 *  - <b>pjsip-simple</b>, 
 *  - <b>pjsip-core</b>, 
 *  - <b>pjmedia</b>,
 *  - <b>pjmedia-codec</b>, 
 *  - <b>pjlib-util</b>, and
 *  - <b>pjlib</b>, 
 *
 * so application must also link with these libraries as well. For more 
 * information, please refer to 
 * <A HREF="http://www.pjsip.org/using.htm">Getting Started with PJSIP</A>
 * page.
 *
 * @subsection pjsua_for_python Python Binding
 *
 * The Python binding for PJSUA-API is implemented by <b>py_pjsua</b>
 * module, in <tt>pjsip-apps/py_pjsua</tt> directory. This module is
 * built by building <tt>py_pjsua</tt> project in <tt>pjsip_apps</tt>
 * Visual Studio workspace, or by invoking the usual <tt>setup.py</tt>
 * Python installer script.
 *
 * The Python script then can import the PJSUA-API Python module by
 * using <b>import py_pjsua</b> construct as usual.
 *
 *
 * @section pjsua_samples
 *
 * Few samples are provided both in C and Python.
 *
  - @ref page_pjsip_sample_simple_pjsuaua_c\n
    Very simple SIP User Agent with registration, call, and media, using
    PJSUA-API, all in under 200 lines of code.

  - @ref page_pjsip_samples_pjsua\n
    This is the reference implementation for PJSIP and PJMEDIA.
    PJSUA is a console based application, designed to be simple enough
    to be readble, but powerful enough to demonstrate all features
    available in PJSIP and PJMEDIA.\n

  - Python sample\n
    For a real simple Python sample application, have a look at
    <A HREF="http://www.pjsip.org/trac/browser/pjproject/trunk/pjsip-apps/src/py_pjsua/pjsua_app.py">
    <tt>pjsip-apps/src/py_pjsua/pjsua_app.py</tt></A> file.

 * @section root_using_pjsua_lib Using PJSUA API
 *
 * Please refer to @ref PJSUA_LIB_BASE on how to create and initialize the API.
 * And then see the Modules on the bottom of this page for more information
 * about specific subject.
 */ 



/*****************************************************************************
 * BASE API
 */

/**
 * @defgroup PJSUA_LIB_BASE PJSUA-API Basic API
 * @ingroup PJSUA_LIB
 * @brief Basic application creation/initialization, logging configuration, etc.
 * @{
 *
 * The base PJSUA API controls PJSUA creation, initialization, and startup, and
 * also provides various auxiliary functions.
 *
 * @section using_pjsua_lib Using PJSUA Library
 *
 * @subsection creating_pjsua_lib Creating PJSUA
 *
 * Before anything else, application must create PJSUA by calling #pjsua_create()
 * (or <tt>py_pjsua.create()</tt> from Python).
 * This, among other things, will initialize PJLIB, which is crucial before 
 * any PJLIB functions can be called, PJLIB-UTIL, and create a SIP endpoint.
 *
 * After this function is called, application can create a memory pool (with
 * #pjsua_pool_create()) and read configurations from command line or file to
 * build the settings to initialize PJSUA below.
 *
 * @subsection init_pjsua_lib Initializing PJSUA
 *
 * After PJSUA is created, application can initialize PJSUA by calling
 * #pjsua_init(). This function takes several optional configuration settings 
 * in the argument, if application wants to set them.
 *
 * @subsubsection init_pjsua_lib_c_cpp PJSUA-LIB Initialization (in C)
 * Sample code to initialize PJSUA in C code:
 \code

 #include <pjsua-lib/pjsua.h>

 #define THIS_FILE  __FILE__

 static pj_status_t app_init(void)
 {
    pjsua_config	 ua_cfg;
    pjsua_logging_config log_cfg;
    pjsua_media_config   media_cfg;
    pj_status_t status;

    // Must create pjsua before anything else!
    status = pjsua_create();
    if (status != PJ_SUCCESS) {
	pjsua_perror(THIS_FILE, "Error initializing pjsua", status);
	return status;
    }

    // Initialize configs with default settings.
    pjsua_config_default(&ua_cfg);
    pjsua_logging_config_default(&log_cfg);
    pjsua_media_config_default(&media_cfg);

    // At the very least, application would want to override
    // the call callbacks in pjsua_config:
    ua_cfg.cb.on_incoming_call = ...
    ua_cfg.cb.on_call_state = ..
    ...

    // Customize other settings (or initialize them from application specific
    // configuration file):
    ...

    // Initialize pjsua
    status = pjsua_init(&ua_cfg, &log_cfg, &media_cfg);
    if (status != PJ_SUCCESS) {
          pjsua_perror(THIS_FILE, "Error initializing pjsua", status);
	  return status;
    }
    .
    ...
 }
 \endcode
 *
 *
 * @subsubsection init_pjsua_lib_python PJSUA-LIB Initialization (in Python)
 * Sample code to initialize PJSUA in Python code:

 \code

import py_pjsua

#
# Initialize pjsua.
#
def app_init():
	# Create pjsua before anything else
	status = py_pjsua.create()
	if status != 0:
		err_exit("pjsua create() error", status)

	# We use default logging config for this sample
	log_cfg = py_pjsua.logging_config_default()

	# Create and initialize pjsua config
	# Note: for this Python module, thread_cnt must be 0 since Python
	#       doesn't like to be called from alien thread (pjsua's thread
	#       in this case)	    
	ua_cfg = py_pjsua.config_default()
	ua_cfg.thread_cnt = 0
	ua_cfg.user_agent = "PJSUA/Python 0.1"

	# Override callbacks. At the very least application would want to
	# override the call callbacks in pjsua_config
	ua_cfg.cb.on_incoming_call = ...
	ua_cfg.cb.on_call_state = ...

	# Use default media config for this cample
	med_cfg = py_pjsua.media_config_default()

	#
	# Initialize pjsua!!
	#
	status = py_pjsua.init(ua_cfg, log_cfg, med_cfg)
	if status != 0:
		err_exit("pjsua init() error", status)



# Utility: display PJ error and exit
#
def err_exit(title, rc):
	py_pjsua.perror(THIS_FILE, title, rc)
	exit(1)

 \endcode


 * @subsection other_init_pjsua_lib Other Initialization
 *
 * After PJSUA is initialized with #pjsua_init(), application will normally
 * need/want to perform the following tasks:
 *
 *  - create SIP transport with #pjsua_transport_create(). Application would
 *    to call #pjsua_transport_create() for each transport types that it
 *    wants to support (for example, UDP, TCP, and TLS). Please see
 *    @ref PJSUA_LIB_TRANSPORT section for more info.
 *  - create one or more SIP accounts with #pjsua_acc_add() or
 *    #pjsua_acc_add_local(). The SIP account is used for registering with
 *    the SIP server, if any. Please see @ref PJSUA_LIB_ACC for more info.
 *  - add one or more buddies with #pjsua_buddy_add(). Please see
 *    @ref PJSUA_LIB_BUDDY section for more info.
 *  - optionally configure the sound device, codec settings, and other
 *    media settings. Please see @ref PJSUA_LIB_MEDIA for more info.
 *
 *
 * @subsection starting_pjsua_lib Starting PJSUA
 *
 * After all initializations have been done, application must call
 * #pjsua_start() to start PJSUA. This function will check that all settings
 * have been properly configured, and apply default settings when they haven't,
 * or report error status when it is unable to recover from missing settings.
 *
 * Most settings can be changed during run-time. For example, application
 * may add, modify, or delete accounts, buddies, or change media settings
 * during run-time.
 *
 * @subsubsection starting_pjsua_lib_c C Example for Starting PJSUA
 * Sample code:
 \code
 static pj_status_t app_run(void)
 {
    pj_status_t status;

    // Start pjsua
    status = pjsua_start();
    if (status != PJ_SUCCESS) {
	pjsua_destroy();
	pjsua_perror(THIS_FILE, "Error starting pjsua", status);
	return status;
    }

    // Run application loop
    while (1) {
	char choice[10];
	
	printf("Select menu: ");
	fgets(choice, sizeof(choice), stdin);
	...
    }
 }
 \endcode

 * @subsubsection starting_pjsua_lib_python Python Example for starting PJSUA
 * For Python, starting PJSUA-LIB takes one more step, that is to initialize
 * Python worker thread to poll PJSUA-LIB. This step is necessary because
 * Python doesn't like it when it is called by an "alien" thread (that is,
 * thread that is not created using Python API).
 *
 * Because of this, we cannot use a worker thread in PJSUA-LIB, because then
 * the Python callback will be called by an "alien" thread and this would
 * crash Python (or raise assert() probably).
 *
 * So because worker thread is disabled, we need to create a worker thread
 * in Python. Note that this may not be necessary if we're creating a
 * GUI application, because then we can attach, for example, a GUI timer
 * object to poll the PJSUA-LIB. But because we're creating a console 
 * application which will block at <tt>sys.stdin.readline()</tt>, we need
 * to have a worker thread to poll PJSUA-LIB.

 \code

import thread

C_QUIT = 0


def app_start():
	# Done with initialization, start pjsua!!
	#
	status = py_pjsua.start()
	if status != 0:
		py_pjsua.destroy()
		err_exit("Error starting pjsua!", status)

	# Start worker thread
	thr = thread.start_new(worker_thread_main, (0,))
    
	print "PJSUA Started!!"

#
# Worker thread function.
# Python doesn't like it when it's called from an alien thread
# (pjsua's worker thread, in this case), so for Python we must
# disable worker thread in pjsua and poll pjsua from Python instead.
#
def worker_thread_main(arg):
	global C_QUIT
	thread_desc = 0
	status = py_pjsua.thread_register("python worker", thread_desc)
	if status != 0:
		py_pjsua.perror(THIS_FILE, "Error registering thread", status)
	else:
		while C_QUIT == 0:
			py_pjsua.handle_events(50)
		print "Worker thread quitting.."
		C_QUIT = 2


 \endcode
 */

/** Constant to identify invalid ID for all sorts of IDs. */
#define PJSUA_INVALID_ID	    (-1)

/** Call identification */
typedef int pjsua_call_id;

/** Account identification */
typedef int pjsua_acc_id;

/** Buddy identification */
typedef int pjsua_buddy_id;

/** File player identification */
typedef int pjsua_player_id;

/** File recorder identification */
typedef int pjsua_recorder_id;

/** Conference port identification */
typedef int pjsua_conf_port_id;



/**
 * Maximum proxies in account.
 */
#ifndef PJSUA_ACC_MAX_PROXIES
#   define PJSUA_ACC_MAX_PROXIES    8
#endif



/**
 * Logging configuration, which can be (optionally) specified when calling
 * #pjsua_init(). Application must call #pjsua_logging_config_default() to
 * initialize this structure with the default values.
 *
 * \par Sample Python Syntax:
 * \code
    # Python type: py_pjsua.Logging_Config
 
    log_cfg = py_pjsua.logging_config_default()
    log_cfg.level = 4
 * \endcode
 */
typedef struct pjsua_logging_config
{
    /**
     * Log incoming and outgoing SIP message? Yes!
     */
    pj_bool_t	msg_logging;

    /**
     * Input verbosity level. Value 5 is reasonable.
     */
    unsigned	level;

    /**
     * Verbosity level for console. Value 4 is reasonable.
     */
    unsigned	console_level;

    /**
     * Log decoration.
     */
    unsigned	decor;

    /**
     * Optional log filename.
     */
    pj_str_t	log_filename;

    /**
     * Optional callback function to be called to write log to 
     * application specific device. This function will be called for
     * log messages on input verbosity level.
     *
     * \par Sample Python Syntax:
     * \code
     # level:	integer
     # data:	string
     # len:	integer

     def cb(level, data, len):
	    print data,
     * \endcode
     */