我正在开发一个小型VOIP客户端应用程序，在C中运行在Linux中。我面临的问题是我需要声学回声消除，而我无法使其正常工作。
基于pjsip示例之一的源代码是
/* $Id: simple_pjsua.c 3553 2011-05-05 06:14:19Z nanang $ */
/*
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
*
* 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
*/
#include <pjsua-lib/pjsua.h>
#define THIS_FILE "APP"
#define SIP_DOMAIN "mydomain"
#define SIP_USER "myuser"
#define SIP_PASSWD "mypass"
#define SIP_REALM "myrealm"
#define SIP_SCHEME "myscheme"
static void call_on_dtmf_callback(pjsua_call_id call_id, int dtmf);
struct pjsua_player_eof_data {
pj_pool_t *pool;
pjsua_player_id player_id;
};
struct pjsua_player_eof_data *eof_data = NULL;
struct timeval t_rly;
pjmedia_echo_state *ec;
pjmedia_frame play_frame, rec_frame;
/* 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);
pjsua_call_get_info(call_id, &ci);
PJ_LOG(2, (THIS_FILE, "Incoming call from %.*s!!",
(int) ci.remote_info.slen,
ci.remote_info.ptr));
/* Automatically answer incoming calls with 200/OK */
pjsua_call_answer(call_id, 200, NULL, NULL);
}
/* 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(2, (THIS_FILE, "Call %d state=%.*s", call_id,
(int) ci.state_text.slen,
ci.state_text.ptr));
}
/* 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);
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);
}
}
/* Display error and exit application */
static void error_exit(const char *title, pj_status_t status) {
pjsua_perror(THIS_FILE, title, status);
pjsua_destroy();
exit(1);
}
/*
* main()
*
* argv[1] may contain URL to call.
*/
int main(int argc, char *argv[]) {
pjsua_acc_id acc_id;
pj_status_t status;
/* Create pjsua first! */
status = pjsua_create();
if (status != PJ_SUCCESS) error_exit("Error in pjsua_create()", status);
/* Init pjsua */
{
pjsua_config cfg;
pjsua_logging_config log_cfg;
pjsua_media_config media_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;
cfg.max_calls = 1;
pjsua_logging_config_default(&log_cfg);
log_cfg.console_level = 6;
pjsua_media_config_default(&media_cfg);
media_cfg.ec_options = PJMEDIA_ECHO_DEFAULT;
media_cfg.ec_tail_len = 250;
status = pjsua_init(&cfg, &log_cfg, &media_cfg);
// status = pjsua_init(&cfg, &log_cfg, NULL);
if (status != PJ_SUCCESS) error_exit("Error in pjsua_init()", status);
pj_pool_t *pool = pjsua_pool_create("my_echo", 1000, 1000);
status = pjmedia_echo_create(pool, 16000, 320, 500, 500, PJMEDIA_ECHO_DEFAULT, &ec);
play_frame.buf = pj_pool_alloc(pool, 320);
rec_frame.buf = pj_pool_alloc(pool, 320);
}
/* 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);
}
/* Initialization is done, now start pjsua */
status = pjsua_start();
if (status != PJ_SUCCESS) error_exit("Error starting pjsua", status);
/* 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_REALM);
cfg.cred_info[0].scheme = pj_str(SIP_SCHEME);
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);
}
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);
}
char option[10];
while (1) {
if (fgets(option, sizeof (option), stdin) == NULL) {
puts("EOF while reading stdin, will quit now..");
break;
}
if (option[0] == 'q')
break;
}
/* Destroy pjsua */
pjsua_destroy();
return 0;
}
回显取消器已创建，但未运行，如日志所示：
16:10:45.203 speex !warning: No playback frame available (your application is buggy and/or got xruns)
16:10:45.207 speex !warning: Auto-filling the buffer (your application is buggy and/or got xruns)
16:10:45.216 speex !warning: internal playback buffer corruption?
16:10:45.221 speex !warning: Auto-filling the buffer (your application is buggy and/or got xruns)
16:10:45.279 speex warning: Had to discard a playback frame (your application is buggy and/or got xruns)
16:10:45.393 speex warning: Auto-filling the buffer (your application is buggy and/or got xruns)
16:10:45.462 speex warning: Had to discard a playback frame (your application is buggy and/or got xruns)
16:10:45.522 speex warning: Auto-filling the buffer (your application is buggy and/or got xruns)
16:10:45.562 speex warning: Had to discard a playback frame (your application is buggy and/or got xruns)
Pjsip版本：2.4
任何人都能说出遗失的内容吗？
感谢。