Re: [linux-audio-dev] Audio over Ethernet / Livewire

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Subject: Re: [linux-audio-dev] Audio over Ethernet / Livewire
From: Dan Hollis (goemon_AT_sasami.anime.net)
Date: Tue Jun 22 2004 - 22:02:27 EEST


On 22 Jun 2004, Michael Ost wrote:
> On Mon, 2004-06-21 at 23:20, Benno Senoner wrote:
> > we could divide 400 bytes into 100 midi events consisting in:
> > 1 byte timestamp relative to the audio fragment (0-127) , this would
> > limit the fragmentsize to max 256 frames
> > 3 byte midi payload
> A couple of thoughts:
> Midi seems very compressable. You'd get a lot of 0x90s and 0x80s, for
> instance. Is that worth pursuing?

You dont want to compress if you want any kind of predictable latency.

> Is some sort of 'sequence' number needed to make sure packets arrived in
> the right order? Or perhaps UDP manages that...?

No, udp has no sequencing. You'll need to define your own sequencing
protocol.

You don't have to worry about out-of-sequence though unless you have
multipath. On a local LAN with ethernet switch, it should be impossible to
get out of sequence packets.

> We're (Muse) also very interested in this sort of technology. We'd most
> likely want to run VNC alongside a protocol like this. Do you think that
> would saturate a 100 base T network?

VNC *alone* can saturate 100bt single handedly.

If you want to do that youll want GbE. Fortunately GbE is dead cheap these
days.

-Dan


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