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

Dan Reardon dtr29 at hotmail.com
Wed Jan 2 20:19:01 CET 2013


Is zeromq's implementation of PGM independent of the message queuing ?
Could we use it for audio over wifi ?  Has anyone else used it for audio over wifi ?


From: steven.mccoy at miru.hk
Date: Wed, 2 Jan 2013 13:58:09 -0500
To: zeromq-dev at lists.zeromq.org
Subject: Re: [zeromq-dev] use zeromq for pgm audio broadcast to android devices ?

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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