[LAU] What audio interface to use for a Linux-powered surround preamp?

[Kaza Kore]

Content Protection sucks!

Going via an analogue hole would be one way, but a pain in the arse. I wouldn't expect any prosumer, and even less professional, to allow you to bypass encryption though. Software solutions may show up...

Seems there is one HD switch/multiplexer available which does though. http://www.moomecard.com/index.php?option=com_content&view=article&id=10&Itemid=16 Output the separate audio and video you want (although audio is on 2x TOSLink.)

But obviously there is the worry that a new version of HDCP will be release tomorrow so bypassing in this manner is never ideal!

Dale.

> Date: Sun, 19 Feb 2012 14:11:14 +0100
> Subject: Re: [LAU] What audio interface to use for a Linux-powered surround preamp?
> From: jherland at gmail.com
> To: dj_kaza at hotmail.com
> CC: gheskett at wdtv.com; linux-audio-user at lists.linuxaudio.org
> 
> Thanks for your reply; some comments below.
> 
> 2012/2/19 Kaza Kore <dj_kaza at hotmail.com>:
> > As to video. There are some HDMI capture cards available, EG Black Magic if
> > on a tight budget, but from a quick reading it seems they all only support
> > the baseline of 2 channel audio on HDMI, rather than the possible 8
> > channels.
> 
> [...]
> 
> An added complication here, is that I want something that will work
> with HDCP (AFAICS, the prosumer video equipment you mention will not
> accept HDCP signals). Also, I'm not really in the market for lots of
> video equipment. I simply want something that can switch between
> mutiple HDMI sources (including consumer equipment such as BluRay/DVD
> players), and then split the chosen HDMI signal, so that video goes
> directly to the screen, and audio goes to my computer for further
> processing.
> 
> Hence, I'm not really in the market for prosumer/professional video
> equipment. I don't actually want the video signal into my computer at
> all. However, there is currently no (consumer-level) standard (except
> HDMI) for transferring multi-channel uncompressed digital audio
> between devices. Ideally, I'd want a device with HDMI input and
> HDMI(video) output, along with outputs for transmitting 8ch LPCM
> (decoded from the HDMI audio signal). The audio output could be
> something like 1 x ADAT, or even 4 x SPDIF (or AES/EBU) - I don't
> really care - as long as it could be straightforwardly connected to my
> computer.
> 
> > Or has the HDMI switch done away with the need for a lot of this? I would of
> > used a basic switch, which are available cheaply, then into the computer
> > using one of the above methods...
> 
> For now, I am using a cheap HDMI switch with an audio de-multiplexer
> that redirects the 2ch. bitstream to an SPDIF output. This is
> obviously not ideal, since it cannot handle >2ch LPCM (including the
> Dolby TrueHD or DTS-HD Master Audio formats), but it _is_ able to do
> the Dolby Digital and DTS formats that are compressed into the 2ch.
> stream. This is "good enough" for now, since most of my video material
> is DVDs (although the BluRay collection is growing slowly), and most
> of the high-quality audio is in computer files that I can play
> directly from the computer and thus does not have to traverse the HDMI
> switch.
> 
> Considering the direction technology is moving, I might have most
> video and audio accessible directly from the computer in the future,
> thus making the HDMI switch less important (only needed for things
> like console games, etc.)
> 
> 
> Have fun! :)
> 
> ...Johan
> 
> -- 
> Johan Herland, <jherland at gmail.com>
> www.herland.net
 		 	   		  
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