PJSIP：没有声卡实现多路会话放音

    一台设备一般只有一个声卡，因此在一台设备上多路放音可以按照以下方法：

1、禁用声卡：调用函数：set_null_snd_dev()

2、然后就可以用play file模式模拟通话，具体代码如下：

import sys
import wave
import pjsua as pj
import thread
import _pjsua
from time import sleep

............................

                       # calculate wav time
                        wfile = wave.open("jason.wav")
                        time1 = (1.0 * wfile.getnframes ()) / wfile.getframerate ()
                        print str(time1) + "ms"
                        wfile.close()

                        # stream wav file
                        current_call.answer(200)
                        time.sleep(1)
                        player_id = lib.create_player("jason.wav",True)#True表示循环播放
                        lib.conf_connect(lib.player_get_slot(player_id),call.info().conf_slot)   
                        lib.conf_connect(call.info().conf_slot,lib.player_get_slot(player_id))
                        
                        time.sleep(CallDuration)

                        lib.conf_disconnect(lib.player_get_slot(player_id),call.info().conf_slot)  
                        lib.conf_disconnect(call.info().conf_slot,lib.player_get_slot(player_id))
                        lib.player_destroy(player_id)
        
                        call.hangup()

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