How to destroy the pjsua player? Help.

[eastern.silence@xxxxxxxxxxx (tonioann)]

Hello,
Guys, in recent days,I was plagued with a problem about pjsua player.
Details is like this: When Client AA make a call to Client BB.
BB will call function pjsua_call_answer() in on_incoming_call() 
(NOTICE: At this time, Client BB's CPU usage is 5%-10% by taskmgr.exe in WinXP). 
Then, AA sends a request to BB with pjsua_call_send_im(). 
At the same time, BB receives the request from AA in on_pager() and plays the wavefile.wav to AA.
Related source codes as following:
 
typedef struct
{
    pjsua_conf_port_id call_port;
    pjsua_conf_port_id player_port;
    pjsua_player_id player_id;
}ClientInfo;
ClientInfo g_ClientInfo;    //global variable
 
//-----------source code in on_pager()
pjsua_player_id  player_id;
pjsua_conf_port_id  player_port;
pjmedia_port  *port;
 
pjsua_player_create(&pj_str("wavefile.wav"), PJMEDIA_FILE_NO_LOOP, &player_id);
player_port = pjsua_player_get_conf_port(player_id);
pjsua_player_get_port(player_id, &port);
 
g_ClientInfo.call_port = incoming_call_port;
g_ClientInfo.player_port = player_port;
g_ClientInfo.player_id = player_id;
 
pjmedia_wav_player_set_eof_cb(port, NULL, &on_playfile_done);
pjsua_player_set_pos(player_id, 0);
pjsua_conf_connect(player_port, incoming_call_port);
//source code on_ pager() end
 
//-----------source code in on_playfile_done()
pj_status_t on_playfile_done(pjmedia_port *port, void *usr_data)
{
    PJ_UNUSED_ARG(port);
    PJ_UNUSED_ARG(usr_data);
 
    pj_status_t status;
    status = pjsua_conf_disconnect(g_ClientInfo.player_port, g_ClientInfo.call_port);
    status = pjsua_player_destroy(g_Clientinfo.player_id);
    return status;
}
//source code in on_playfile_done() end
 
I can hear the wavefile.wav in Client AA, but when destroy the player with pjsua_player_destroy(),
the Client BB's CPU usage is up to 20%-30%, unless you hangup the call.
So, my problem is: How to destroy the player to release all resource?
How to make the CPU usage returns to the normal rate, that is 5%-10%?
By the way, we need the call works normally during the communication.
PS, my working environment is Windows XP, Visual Studio 2008 and PJSIP 1.8.5
 
I am looking forward to your reply and thanks.Happy new year!
 
---------------------------------------------------- 
Regards, Tonio 
E-mail?eastern.silence at foxmail.com
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