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Q: Is this supported by the Live555 media server libraries?<br>
A: There is no support, you have to build it in yourself<br>
<br>
One of your streams will indeed return a=sendonly, check on that
string to detect the backchannel MediaSubsession.<br>
Instead of creating a FramedSource in your MediaSubsession you have
to create an RTPSink.<br>
Eventually you will call startPlaying on the sink and then you can
start sending data into the sink.<br>
<br>
You should read the onvif specs first to see how the communication
must be.<br>
There is a backchannel section.<br>
<a class="moz-txt-link-freetext" href="http://www.onvif.org/specs/stream/ONVIF-Streaming-Spec-v210.pdf">http://www.onvif.org/specs/stream/ONVIF-Streaming-Spec-v210.pdf</a><br>
<br>
<br>
<div class="moz-cite-prefix">Op 02-Jun-16 om 8:42 PM schreef Ben
Rush:<br>
</div>
<blockquote
cite="mid:CANV0r97fohiNfKbJkWiLbHFQKYtmH8jH8JNh2s=ahm1Sueop5A@mail.gmail.com"
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<div dir="ltr">Fredrick, <br>
<br>
Great, thanks for the info, at least. So, as far as the ONVIF
backchannel stuff is concerned: <br>
<br>
I noticed that, per the specification, it requires that one of
the streams be a=sendonly (for the "backchannel" stream). What
I'm confused about is this in particular. Is this supported by
the Live555 media server libraries? To me this means the server
itself should be receiving streaming content from the client
(right?), but I don't see anything in the server libraries for
*receiving* content. <br>
<br>
We've had a pretty basic use case up until now, and so some of
these more advanced server features may have escaped me. But,
I'm unable to find any way for the server to receive media
content from a client in the API. <br>
<br>
Thanks again. </div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Thu, Jun 2, 2016 at 4:08 AM Frederik De Ruyck
<<a moz-do-not-send="true"
href="mailto:frederik.deruyck@vsk.be">frederik.deruyck@vsk.be</a>>
wrote:<br>
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<p>No there's no support in LiveMedia yet.</p>
<p>We have to do the same so I'm implementing it myself atm.
You can use the RTSP require tag (which is optional) and
Onvif backchannel (which uses RTSP require).</p>
<p>I hacked it into someone else his startings: <a
moz-do-not-send="true"
href="https://github.com/alb423/live555_20140206"
target="_blank"><a class="moz-txt-link-freetext" href="https://github.com/alb423/live555_20140206">https://github.com/alb423/live555_20140206</a></a></p>
<p>I won't post my modifications to this github project
because the project is quite sloppy and it got worse
because I hard coded a lot of things.<br>
</p>
<p>I had to add RTSP require fields everywhere it was still
missing in the project (take a look at
RTSPClient::setRequestFields, modify every command if it's
backchannel related, add require to it)</p>
<p>The project uses UDP btw, I don't have it working with
tcp yet.<br>
</p>
<p>You will have to learn how LiveMedia works to get it done
anyhow.<br>
</p>
<br>
<div>Op 01-Jun-16 om 9:09 PM schreef Ben Rush:<br>
</div>
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<div dir="ltr">We have built a RTSP streaming server using
Live555's server libraries: <br>
<br>
....<br>
RTSPServer* rtspServer =
RTSPServer::createNew(*usageEnvironment,
StreamingOptions::PortNumber, NULL);<br>
....
<div><br>
</div>
<div>And so on. Works like a charm and we're very happy
with it. What we're needing now is a solution for
two-way audio, meaning we have a camera viewing a room
and we'd like a person in the room and the person
viewing the room to be able to talk with one another.
To reduce overhead we'd like to enable the audio to be
duplex, so it shares the same channel (much like
VOIP). I'm quite certain but I thought I'd ask:
there's no support for this in RTSP and therefore no
support for duplex audio in Live555's server
libraries, correct? <br>
<br>
<br>
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