[Live-devel] Need advice on best way to proceed.

Ben Rush ben at ben-rush.net
Thu Jun 2 11:42:39 PDT 2016


Fredrick,

Great, thanks for the info, at least. So, as far as the ONVIF backchannel
stuff is concerned:

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.

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.

Thanks again.

On Thu, Jun 2, 2016 at 4:08 AM Frederik De Ruyck <frederik.deruyck at vsk.be>
wrote:

> No there's no support in LiveMedia yet.
>
> 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).
>
> I hacked it into someone else his startings:
> https://github.com/alb423/live555_20140206
>
> 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.
>
> 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)
>
> The project uses UDP btw, I don't have it working with tcp yet.
>
> You will have to learn how LiveMedia works to get it done anyhow.
>
> Op 01-Jun-16 om 9:09 PM schreef Ben Rush:
>
> We have built a RTSP streaming server using Live555's server libraries:
>
> ....
> RTSPServer* rtspServer = RTSPServer::createNew(*usageEnvironment,
> StreamingOptions::PortNumber, NULL);
> ....
>
> 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?
>
>
>
>
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>
>
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