Multi rtp streams - thread issue

[Elio Francesconi]

Hi Sebastian,
I’ve found the issue, it is due to VoIP protocol, how it opens the rtp streams are opened by the endpoint.

My soft phone (linphone again) want a symmetric RTP and changes the destination port in case “udpsink” and “udpsrc” differs.
This is the scenario:

PIPELINE#1
audiotestsrc ! audioconvert ! alawenc ! rtppcmapay ! udpsink host=192.168.1.6 port=7078

PIPELINE#2
rtpbin  udpsrc caps=application/x-rtp,media=(string)audio,clock-rate=(int)8000,encoding-name=(string)PCMA port=5008 ! rtppcmadepay ! alawdec ! audioconvert ! audioresample ! osxaudiosink


GSTREAMER ————————————————> LINPHONE
ipadders: 192.168.1.3                                                 ipaddress: 192.168.1.6
port(random): 57401                                                   PORT:       7078

GSTREAMER <--------------------------------------------------- LINPHONE
ipadders: 192.168.1.3                                                 ipaddress: 192.168.1.6
port(random): 5008                                                   PORT:       7078

I was expecting this behaviour, but linphone sends the rtp packets to 57401 instead of 5008 (symmetric RTP)

 
So I was wondering if it is possible solving the issue creating the pipeline#1 using source port defined by the user, in my case: 5008

Thanks
Elio
On 31 Oct 2013, at 16:41, Sebastian Dröge <sebastian at centricular.com> wrote:

> On Do, 2013-10-31 at 14:51 +0100, Elio Francesconi wrote:
>> This is the pseudocode, where the app invoke RtpSink::loop and RtpSource::loop in two different threads(description of my pipeline is as described in the previous mail), it is based on these two example
>> http://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/tests/examples/rtp/server-alsasrc-PCMA.c
>> http://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/tests/examples/rtp/client-PCMA.c 
>> I was expecting to create multiple pipelines each one with their structures and with our interaction, I think I’m in wrong :-)
> 
> Nothing looking wrong in that code, but you could as well run both
> pipelines from the same thread with a single mainloop.
> 
> How exactly do they fail? Does the receiver receive any packets at all?
> Check that with a simpler pipeline that only has udpsrc and a fakesink.
> 
> -- 
> Sebastian Dröge <sebastian at centricular.com>
> Centricular Ltd - http://www.centricular.com
> Expertise, Straight from the Source
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