<html><body style="font-family: Helvetica,Arial,sans-serif; font-size: 12px;">Another solution for 4x ADAT i/o: 2 RME hammerfall cards, turned into 1 alsa virtual card.<br>I'm using 2 digi9636 cards and am getting rock-solid performance at low latencies.<br><br><blockquote><br>----- Original Message -----<br><div id="origionalMessageFromField" style="width:100%;background:rgb(228,228,228);"><div style="font-weight:bold;">From:</div> linux-audio-dev@lists.linuxaudio.org</div><br><div id="origionalMessageToField" style="font-weight:bold;">To:</div><linux-audio-dev@lists.linuxaudio.org><br><div id="origionalMessageSentField" style="font-weight:bold;">Cc:</div><br><div style="font-weight:bold;">Sent:</div>Sun, 29 Jan 2017 12:00:01 +0000<br><div id="origionalMessageSubjectField" style="font-weight:bold;">Subject:</div>Linux-audio-dev Digest, Vol 119, Issue 7<br><br><br>
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Today's Topics:<br><br>
1. Re: RME Digiface USB ? (Adrian Knoth)<br><br><br>
----------------------------------------------------------------------<br><br>
Message: 1<br>
Date: Sat, 28 Jan 2017 15:50:02 +0100<br>
From: Adrian Knoth <adi@drcomp.erfurt.thur.de><br>
To: Damien Zammit <damien.zammit@gmail.com><br>
Cc: linux-audio-dev@lists.linuxaudio.org<br>
Subject: Re: [LAD] RME Digiface USB ?<br>
Message-ID: <20170128145002.GH22406@ltw.loris.tv><br>
Content-Type: text/plain; charset=us-ascii<br><br>
On Sat, Jan 28, 2017 at 07:27:21PM +1100, Damien Zammit wrote:<br><br>
> Hey,<br><br>
Hi!<br><br>
> Anyone got one of these? Does it work with GNU/Linux (yet)?<br>
> Curious about xrun performance with 4x ADAT i/o over USB2...<br><br>
Last time I spoke with someone from RME (that was probably back in 2012<br>
or 2013), they were unwilling to give us their USB drivers (let's say to<br>
maintain their competitive edge) nor to document the protocol (why would<br>
they, the driver is free to change it at any point in time).<br><br>
That said, I see three options:<br><br>
1. Get an EXBOX.UMA. 32in/32out ADAT/MIDI/USB. The company is super<br>
helful, provided all the specs and enabled me to write a working driver:<br><br>
https://plus.google.com/+adiknoth/posts/PddEdbm7PNj<br><br>
The product is discontinued, but if you want to polish the driver a bit,<br>
I can lend you mine indefinitely. Should be fully functional, only the<br>
control software could use a decent UI (I tried HTML5 talking to an<br>
HTTP-to-MIDI server in Go but then had no time to finish it - cmdline is<br>
ready, though)<br><br>
2. Reverse-Engineer the RME protocol. Probably lots for work. Basically<br>
what folks did when FFADO started, but it's cumbersome to interpret<br>
individual bits in a long bitstream just to spot the individual samples.<br>
And even then it'd be another six months to write the driver.<br><br>
3. Talk to RME (I can give you a contact) and try to get hold of their<br>
driver sources or a protocol spec. Both is very unlikely, especially<br>
since they were repeatedly unwilling to reveal anything that involves<br>
the new TotalMix.<br><br><br>
The other option is to forget about USB2 and look at other connectors<br>
like Thunderbolt (ultimately external PCIe) or Ravenna/AVB. And last not<br>
least, there's an ALSA driver for Dante somewhere.<br><br>
Speaking of Thunderbolt: if you just want 4xADAT, you can always put an<br>
RME RayDat or one of the Marian cards in an external Thunderbolt<br>
enclosure.<br><br><br>
HTH<br><br>
-- <br>
mail: adi@thur.de http://adi.thur.de PGP/GPG: key via keyserver<br><br><br><br>
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End of Linux-audio-dev Digest, Vol 119, Issue 7<br>
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