24/96 Squeezeplay and External USB DAC

General discussion relating to the O2 Joggler, from the default O2 setup, to alternative operating systems and applications.
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jemhayward
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24/96 Squeezeplay and External USB DAC

Post by jemhayward » Wed Sep 12, 2012 7:13 pm

This is really just for the nerdy HiFi fans...
The Squeezebox Touch will play high resolution audio files, and with an amazing 3rd party app from a chap called "Triode" on the squeezebox forums, it will do this via USB. I use a Touch in my main HiFi system, and the sound, via an Audiolab MDAC is absolutely stunning. Although I dont *need* to do this with my Jogglers, I seem to feel I should be able to. However, my enthusiasm isn't matched by my linux programming skills.
The otherwise perfect SqueezeplayOS is limited to 16bit/44.1kHz by the configuration file asound.conf
I also have a squeezeplay oriented installation by Gordon Cooper, which at least thinks its playing the high res files, but it wont route out via USB.

Is there anyone else out there who has the relevant skills and nerdiness to work on getting this working with me?

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Mevi
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Re: 24/96 Squeezeplay and External USB DAC

Post by Mevi » Wed Sep 12, 2012 7:29 pm

I'm reading up on the audio capabilities of the Joggler at the moment, so your question is well timed. The STAC9202 sound chip in the Joggler is capable of 24bit and sample rates up to 192khz - up to 88khz via digital outs if you wanted to solder onto the audio chip to get optical or coax.

The question of using a USB sound card has been asked a couple of times on the forum before, so you should get an answer soon, but try a search on the forum and see if the changes you need to make are there.
I've Got The Moves Like Joggler

Windows XP Professional SP3 plus Tablet PC for O2 Joggler
http://www.jogglerwiki.com/forum/viewto ... ?f=2&t=305

How to build your own Windows XP for the Joggler
http://www.jogglerwiki.com/wiki/WindowsXP

gegs
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Re: 24/96 Squeezeplay and External USB DAC

Post by gegs » Wed Sep 12, 2012 11:36 pm

Try the Behringer UCA202 USB soundcard. It works out of the box if you use the USB sound switch, which I think is available as an executable script in SWF Manager in PnPIII. The Behringer UCA 202 has phono, 3.5mm headphone and optical S/PDIF outputs.

I don't know anything about USB sound capabilities or modifying sound configuration files for higher bitrate audio. The quality I get at the moment is pretty good for my mediocre hi-fi setup but I'd still be interested in improving the quality of the output (who wouldn't) if anybody else knows how.

The original sound.conf specified the bitrate (48k) but the simplified version I'm using makes no mention of this. I'm not sure what bitrate the output default is in this circumstance.

Wilberforce
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Re: 24/96 Squeezeplay and External USB DAC

Post by Wilberforce » Thu Sep 13, 2012 12:41 am

Check out:

http://forums.slimdevices.com/showthrea ... up-to-192k

Code: Select all

 settings = {mac="xx:xx:xx:xx:xx:xx",uuid="xxxxxxxxxxxxxxxxxxxx",alsaPlaybackDevice="plughw:0,0",alsaSampleSize=24,alsaPlaybackBufferTime=50000,alsaPlaybackPeriodCount=3,} 
in ~/.squeezeplay/userpath/settings/DesktopJive.lua

For the plughw, the first number is the card id and the second is the device. So if you

Code: Select all

 cat /proc/asound/cards 
to find the card id and

Code: Select all

cat /proc/asound/devices 
(look for playback device) for the device. Without the patch it will play stuff at its native sampling frequency up 96 khz (above that you''ll need the patch I think - my dac only goes upto to 96).

gegs
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Location: Edinburgh

Re: 24/96 Squeezeplay and External USB DAC

Post by gegs » Thu Sep 13, 2012 9:55 am

@Wilberforce - Thanks for the link. I'll give it a go when I have some time (probably not before the weekend).

Further down the thread wilbert-vb (not you, is it?) says this:
Thank you very much for this gem of information, I do want to add that the mentioned line results in a high CPU load. Top shows a load of 30%, fan is blowing.

When I modify the line to this, I have a normal CPU load of 1%:

Code: Select all

settings = {mac="xx:xx:xx:xx:xx:xx",uuid="yyy",alsaSampleSize =24,alsaPlaybackDevice="plughw:1,0",}
and fan is off.
Have you tried this method with the Joggler?

Wilberforce
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Re: 24/96 Squeezeplay and External USB DAC

Post by Wilberforce » Thu Sep 13, 2012 1:50 pm

@gegs

Cpu load is ~6% on my joggler. Unfortuantly, I think your dac is limited to 16bit, 44.4khz, but not to worry, It just means your flacs won't take up unnecessary disk space and you won't have to pay a premium for them - audiophoolery anyone?!

gegs
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Re: 24/96 Squeezeplay and External USB DAC

Post by gegs » Thu Sep 13, 2012 5:34 pm

Wilberforce wrote:...I think your dac is limited to 16bit, 44.4khz...
I was going to upgrade the DAC on my hi-fi set-up at some point and transfer the Behringer to the kitchen Joggler. Could you recommend a better DAC? Preferably under a hundred quid.

Wilberforce
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Re: 24/96 Squeezeplay and External USB DAC

Post by Wilberforce » Thu Sep 13, 2012 6:57 pm

I was going to upgrade the DAC on my hi-fi set-up at some point and transfer the Behringer to the kitchen Joggler. Could you recommend a better DAC? Preferably under a hundred quid.
I have a dacmagic, but these http://www.richersounds.com/product/dac ... teac-udh01 look pretty good value at the moment. Look out for asynchronous usb support and a decent power supply.

gegs
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Re: 24/96 Squeezeplay and External USB DAC

Post by gegs » Fri Sep 14, 2012 9:51 am

Thanks very much for that.

I think this will have to go on my Christmas list (of presents I'll buy for myself). Despite getting loads of hints for what my wife would like "from Santa" (and heaven help me if she doesn't get at least a couple of them), whenever I mention what I would like she goes all "techno-blind" on me and I get clothes and toiletries.

jemhayward
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Re: 24/96 Squeezeplay and External USB DAC

Post by jemhayward » Fri Sep 14, 2012 4:57 pm

So, it looks like it IS possible... I'm happy with SqueezeplayOS, so ideally I'd like a version of SqueezeplayOS (internal) that incorporates these mods. I don't think I have the skills to build one, hopefully someone here does (sounds like you do!)

Wilberforce
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Re: 24/96 Squeezeplay and External USB DAC

Post by Wilberforce » Sat Sep 15, 2012 2:00 am

You just need to edit:

Code: Select all

~/.squeezeplay/userpath/settings/DesktopJive.lua 
with a text editor (nano/vi). Your dac is limited to 24/96 on the usb, so the patches aren't necessary. Do this with some sort of ssh client (putty?) - I believe you will have to install the ssh server via one of the menus in squeezeplay ('additional features' or whatever it ended up being named ;D)

added:

I imagine it will look like this for you:

Code: Select all

settings = {mac="xx:xx:xx:xx:xx:xx",uuid="xxxxxxxxxxxxxxxxxxxx",alsaPlaybackDevice="plughw:1,0",alsaSampleSize=24,alsaPlaybackBufferTime=50000,alsaPlaybackPeriodCount=3,} 
note the:

Code: Select all

alsaPlaybackDevice="plughw:1,0" 
and use the mac and uuid that are already in there.

themystical
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Re: 24/96 Squeezeplay and External USB DAC

Post by themystical » Thu Sep 20, 2012 12:39 pm

Wilberforce wrote:
I have a dacmagic, but these http://www.richersounds.com/product/dac ... teac-udh01 look pretty good value at the moment. Look out for asynchronous usb support and a decent power supply.
This looks like an interesting DAC to run with the Joggler. Having looked at its manual, it seems to suggest that you need to install drivers prior to use and only drivers for Windows/Mac are provided. Googling suggests that it has been used with Squeezebox Touch which runs Linux? provided one uses a "Triode" add on? Would this DAC be compatible with the Openpeak OS on the Joggler?

Wilberforce
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Re: 24/96 Squeezeplay and External USB DAC

Post by Wilberforce » Thu Sep 20, 2012 8:03 pm

themystical wrote:
Wilberforce wrote:
I have a dacmagic, but these http://www.richersounds.com/product/dac ... teac-udh01 look pretty good value at the moment. Look out for asynchronous usb support and a decent power supply.
This looks like an interesting DAC to run with the Joggler. Having looked at its manual, it seems to suggest that you need to install drivers prior to use and only drivers for Windows/Mac are provided. Googling suggests that it has been used with Squeezebox Touch which runs Linux? provided one uses a "Triode" add on? Would this DAC be compatible with the Openpeak OS on the Joggler?
Yeah, like you say, the fact that it works with a squeezebox touch suggests that linux compatability is there.

Wilberforce
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Re: 24/96 Squeezeplay and External USB DAC

Post by Wilberforce » Thu Sep 20, 2012 9:34 pm

Wilberforce wrote: Yeah, like you say, the fact that it works with a squeezebox touch suggests that linux compatability is there.
Actually I think the original OS kernel version is too old to support class 2 usb audio devices, so whether or not it would work, I'm not too sure :D

themystical
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Re: 24/96 Squeezeplay and External USB DAC

Post by themystical » Fri Sep 21, 2012 8:18 am

Yes probably best to stick with class 1 usb audio devices until somebody actually tries a class 2 audio device with the Openpeak OS and confirms whether or not it is compatible. Thanks for your help Wilberforce.

jemhayward
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Re: 24/96 Squeezeplay and External USB DAC

Post by jemhayward » Fri Sep 21, 2012 9:36 am

I'm probably showing my ignorance here, but, I use the Triode USB on my "real" Squeezebox touch, and it works really well. Could I run the same thing on my squeezeplayOS joggler with the same result?

Wilberforce
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Re: 24/96 Squeezeplay and External USB DAC

Post by Wilberforce » Fri Sep 21, 2012 11:12 am

I believe his plugin uses a custom kernel / jive_alsa, both of which will be compiled for a ARM target (squeezebox touch). So the answer is, "no", not with out a bit of hacking/recompilation (for x86).

jemhayward
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Re: 24/96 Squeezeplay and External USB DAC

Post by jemhayward » Fri Sep 21, 2012 11:26 am

ah, yes, bit beyond my competence level...

I'll play with desktopjive.lua at the weekend and will report back...

jemhayward
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Re: 24/96 Squeezeplay and External USB DAC

Post by jemhayward » Sat Sep 22, 2012 5:40 pm

I've edited desktopjive.lua as above, but I'm still outputting 24 bit files as 16/44.1 through the USB. I think I may need to poke around inside asound.conf having read Roobarbs posts. Where will I find asound.conf?

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JimbobVFR400
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Re: 24/96 Squeezeplay and External USB DAC

Post by JimbobVFR400 » Sat Sep 22, 2012 5:50 pm

In /etc
Probably a good plan to back it up before changing.

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