Hello,
I am trying to develop UAC on pjsua2 library basis, windows 7 platform.
And I have a problem to set custom SDP offer in INVITE message. I used
onCallSdpCreated() virtual method to set PCMU/8000 and PCMA/8000 codecs
only:
class MyCall : public Call
{
...
virtual void onCallSdpCreated( OnCallSdpCreatedParam &prm );
...
};
void MyCall::onCallSdpCreated( OnCallSdpCreatedParam &prm )
{
// ?hanging prm.sdp.wholeSdp string according to my codecs
prm.sdp.wholeSdp = ?v=0\r\n...
}
This doesn?t work. In INVITE message I see initial automatically generated
SDP offer as before.
It seems there are two variants.
1) It?s not enough to change prm.sdp.wholeSdp only.I need to do some more
actions to apply changes. If so, please, give me a hint what I should do.
2) It?s a bug. I used a debugger to see a call stack. Here it is
MyCall.cpp: MyCall::onCallSdpCreated( OnCallSdpCreatedParam &prm )
Endpoint.cpp: Endpoint::on_call_sdp_created(..., pjmedia_sdp_session *sdp,
...)
Pjsua_media.c: pjsua_media_channel_create_sdp(..., pjmedia_sdp_session
**p_sdp,...)
Pjsua_call.c: on_make_call_med_tp_complete(...)
on_make_call_med_tp_complete() function sends INVITE message. But my custom
SDP offer is not available here. To get it available the signature should
be Endpoint::on_call_sdp_created (?, pjmedia_sdp_session **sdp, ?). But
this doesn?t solve the problem. The pointers to SDP string are not valid
because prm.sdp.wholeSdp string out of scope here. As soon as I made
OnCallSdpCreatedParam prm be static (just for experiment) in
Endpoint::on_call_sdp_created() my SIP UA sends SDP offer I want.
Thank you
Maxim S
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