[opus] Antw: [EXT] Opus merging streams

[Marc Lavallée]

Le 2022-03-24 à 10 h 54, Andrew Sonzogni a écrit :
>
> Hi Marc,
>
> Thanks for the quick reply.
>
> Then it’s not possible to mix those packets before decoding them ?
>
I don't think it's possible, but I'm not a codec expert, just a simple user.

> Because summing after Opus would mean 3-4 decode every 40ms (frame 
> size) and 3-4 queue of 1280o msg…
>
I think that the latency would be a little bit more than 80ms in the 
worst cases.
I could be wrong...

Marc

> Best regards,
>
> Andrew
>
> *De :* opus <opus-bounces at xiph.org> *De la part de* Marc Lavallée
> *Envoyé :* jeudi 24 mars 2022 15:23
> *À :* opus at xiph.org
> *Objet :* Re: [opus] Antw: [EXT] Opus merging streams
>
> Hi Andrew,
>
> I think you'd have to decode each packet independently, then sum the 
> results, making sure that packets (from different sources) all have 
> the same number of samples.
>
> Marc
>
> Le 2022-03-24 à 10 h 14, Andrew Sonzogni a écrit :
>
>     Hello,
>
>       
>
>     Yes, I mean mix multiple streams.
>
>       
>
>     Best regards,
>
>     Andrew Sonzogni
>
>       
>
>     -----Message d'origine-----
>
>     De : Ulrich Windl<Ulrich.Windl at rz.uni-regensburg.de>  <mailto:Ulrich.Windl at rz.uni-regensburg.de>
>
>     Envoyé : jeudi 24 mars 2022 15:00
>
>     À :andrew at safehear.fr;opus at xiph.org
>
>     Objet : Antw: [EXT] [opus] Opus merging streams
>
>       
>
>                 Andrew Sonzogni<andrew at safehear.fr>  <mailto:andrew at safehear.fr>  schrieb am 24.03.2022 um 14:46
>
>                 in
>
>     Nachricht<592e07eaa0e866e10543cf887948874d at mail.gmail.com>  <mailto:592e07eaa0e866e10543cf887948874d at mail.gmail.com>:
>
>         Hello !
>
>           
>
>           
>
>           
>
>         I have a question. I'm trying to use Opus on an embedded device which
>
>         communicate with several other devices with the same software.
>
>           
>
>         I wanted to know if it's possible to merge Opus packets from different
>
>         sources and then decode this merged packet through a normal opus_decode.
>
>       
>
>     "merge" means "concatenate"? Or "mix"?
>
>       
>
>           
>
>           
>
>           
>
>         I receive in real time 3 different streams of 40ms opus packets. As it
>
>         would be consuming too much CPU if I decode each packets and then sum
>
>         them together, I would like to decode them together.
>
>       
>
>     "sum" sounds like "mix", right?
>
>       
>
>           
>
>           
>
>           
>
>         Best regards,
>
>           
>
>         Andrew Sonzogni
>
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