how can i make pjsua as recvonly vid ua

zhuyongwen@xxxxxxxxxxxxxxxxx (zhuyongwen at made-in-china.com) · Wed, 11 Nov 2015 11:23:08 +0800

Hi all, 
    i video call , when one ua-a doens't got any camer , the other side(ua-b) will show a picutre like below :

so i try to make the ua-b as one video recvonly ,

in my ua-b my code like this  : 
on_pjsip_media_state(pjsua_call_id cid ) {
*******

if(type==VIDEO)
{
    pjsua_call_vid_strm_op_param param;
    pjsua_call_vid_strm_param_default(&param);
    param.dir = PJMEDIA_DIR_DECODEING;
    pjsua_call_set_vid_strm(cid,PJSUA_CALL_VID_STREM_CHANGE_DIR, &param);
}
**********
}

but it doen't work , the sdp will still sendrecv;

v=0
o=- 3656229426 3656229428 IN IP4 221.226.184.166
s=pjmedia
b=AS:621
t=0 0
a=X-nat:0
m=audio 54641 RTP/AVP 98 96
c=IN IP4 221.226.184.166
b=TIAS:64000
a=sendrecv
a=rtpmap:98 speex/16000
a=rtpmap:96 telephone-event/8000
a=fmtp:96 0-16
a=ice-ufrag:6e5d1ad4
a=ice-pwd:63cb6bfc
a=rtcp:61445 IN IP4 192.168.17.153
a=candidate:Rdde2b8a6 1 UDP 16777215 221.226.184.166 54641 typ relay raddr 192.168.28.106 rport 10383
a=candidate:Rc0a81199 2 UDP 16777214 192.168.17.153 61445 typ relay raddr 192.168.28.106 rport 10384
m=video 63261 RTP/AVP 97
c=IN IP4 221.226.184.166
b=TIAS:512000
a=sendrecv
a=rtpmap:97 H264/90000
a=fmtp:97 profile-level-id=42e01e; packetization-mode=1
a=ice-ufrag:2213260d
a=ice-pwd:6b89030a
a=rtcp:53440 IN IP4 221.226.184.166
a=candidate:Rdde2b8a6 1 UDP 16777215 221.226.184.166 63261 typ relay raddr 192.168.28.106 rport 10385
a=candidate:Rdde2b8a6 2 UDP 16777214 221.226.184.166 53440 typ relay raddr 192.168.28.106 rport 10386

so how can i make ua-b just recv the vid stream?  thx a lot..

Best regards.
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