[LAD] RME Digiface USB ? (Adrian Knoth)

[bart at magnetophon.nl]

Another solution for 4x ADAT i/o: 2 RME hammerfall cards, turned into
1 alsa virtual card.
I'm using 2 digi9636 cards and am getting rock-solid performance at
low latencies.

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 Today's Topics:

 1. Re: RME Digiface USB ? (Adrian Knoth)

 ----------------------------------------------------------------------

 Message: 1
 Date: Sat, 28 Jan 2017 15:50:02 +0100
 From: Adrian Knoth <adi at drcomp.erfurt.thur.de>
 To: Damien Zammit <damien.zammit at gmail.com>
 Cc: linux-audio-dev at lists.linuxaudio.org
 Subject: Re: [LAD] RME Digiface USB ?
 Message-ID: <20170128145002.GH22406 at ltw.loris.tv>
 Content-Type: text/plain; charset=us-ascii

 On Sat, Jan 28, 2017 at 07:27:21PM +1100, Damien Zammit wrote:

 > Hey,

 Hi!

 > Anyone got one of these? Does it work with GNU/Linux (yet)?
 > Curious about xrun performance with 4x ADAT i/o over USB2...

 Last time I spoke with someone from RME (that was probably back in
2012
 or 2013), they were unwilling to give us their USB drivers (let's say
to
 maintain their competitive edge) nor to document the protocol (why
would
 they, the driver is free to change it at any point in time).

 That said, I see three options:

 1. Get an EXBOX.UMA. 32in/32out ADAT/MIDI/USB. The company is super
 helful, provided all the specs and enabled me to write a working
driver:

 https://plus.google.com/+adiknoth/posts/PddEdbm7PNj

 The product is discontinued, but if you want to polish the driver a
bit,
 I can lend you mine indefinitely. Should be fully functional, only
the
 control software could use a decent UI (I tried HTML5 talking to an
 HTTP-to-MIDI server in Go but then had no time to finish it - cmdline
is
 ready, though)

 2. Reverse-Engineer the RME protocol. Probably lots for work.
Basically
 what folks did when FFADO started, but it's cumbersome to interpret
 individual bits in a long bitstream just to spot the individual
samples.
 And even then it'd be another six months to write the driver.

 3. Talk to RME (I can give you a contact) and try to get hold of
their
 driver sources or a protocol spec. Both is very unlikely, especially
 since they were repeatedly unwilling to reveal anything that involves
 the new TotalMix.

 The other option is to forget about USB2 and look at other connectors
 like Thunderbolt (ultimately external PCIe) or Ravenna/AVB. And last
not
 least, there's an ALSA driver for Dante somewhere.

 Speaking of Thunderbolt: if you just want 4xADAT, you can always put
an
 RME RayDat or one of the Marian cards in an external Thunderbolt
 enclosure.

 HTH

 -- 
 mail: adi at thur.de http://adi.thur.de PGP/GPG: key via keyserver

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