Re: [Linphone-developers] Using oRTP to send supplemental data besides the audio

[Vadim Lebedev]

You'll have problems with this approach.
It will be extremely difficult to avoid audio quality degradation.

Thanks
Vadim

Le 19 déc. 08 à 01:01, Steve Strobel a écrit :

> > > If I used just the one RTP session and sent some packets with the  
> > > G. 711u payload type
> > > and other packets as a different (maybe non-audio)  type...
>
> The more I think about this idea, the more I like it.  I could  
> provide a "compatibility mode" for use with other RTP devices.  But  
> on our devices, it might be fairly easy to implement and should  
> require no changes to oRTP.
>
> When sending data, I would first have to call  
> rtp_session_set_send_payload_type(), then restore it before sending  
> audio again.
>
> On the receiving end, the docs on  
> rtp_session_set_send_payload_type() say, "For payload type in  
> incoming packets, the application can be informed by registering for  
> the "payload_type_changed" signal, so that it can make the necessary  
> changes on the downstream decoder that deals with the payload of the  
> packets."  My "downstream decoder" could use that signal to switch  
> whether the received data was handled as audio or data, effectively  
> demultiplexing it.  Does anyone see a problem with that method?
>
> Thanks for any input,
> Steve
>
>
>
> ---
> Steve Strobel
> Link Communications, Inc.
> 1035 Cerise Rd
> Billings, MT 59101-7378
> (406) 245-5002 ext 102
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