[zeromq-dev] use zeromq for pgm audio broadcast to android devices ?

[Steven McCoy]

On 2 January 2013 13:27, Dan Reardon <dtr29 at hotmail.com> wrote:

>  (a) Has anyone used PGM over WIFI to devices yet? Anyone tried it with
> hundreds or thousands of phones? (b) How well does it (or should it) work?
>

WiFi always has scalability issues, some intelligence is probably requiring
deploying to large scale across many access points.


> (c) If the wifi / electrical environment is dirty, will zeroMQ's queuing
> mechanisms get in my way?
>

Yes.  ZeroMQ is asynchronous, it's about dumping data as fast as possible
to the destination, for audio you want low-latency unreliable messaging
requiring no round trips.


> "guaranteed delivery", as this is a real time broadcast, missing audio
> segments should be substituted with silence when the cannot
>

Spotify handles this a little better with white noise.

There is an option of FEC to improve quality in lossy environments.


> Is there any chance that anyone would want to implement Uflood, Ucast or
> any other protocol specifically designed for wifi?
>

WiFi generally means completely random data-loss due to radio interference,
wired paths suffer more predictable data-loss and typically burst outages.


> We may be in a position to provide a testbed environment for large-scale
> wifi testing if someone else wants to develop the code! Who should we be
> talking to? Anyone interested in being the lead archtect or developer if we
> can support testing?
>

I actually have some hardware that may be suitable for such testing, 29
small devices with limited CPU and memory that can be networked via radio
or cable.

-- 
Steve-o
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