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Using Two Dac Simultaneously


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#1
Hello Snakeoilers Smile

I also asked this question to upmpdcli's coder J.F Dockes but is would not be enough...
The question is:  

"When i'm plug my two dacs at the same time to my Snakeoil os based streamer, Os accepts two of them. You know actually lms can give dac change possibility to user. My theory is if i modify the upmpdcli to accept two of my dacs, i can change my dacs on lms control client simultaneously. 
Is this possible?"

Especially the question is for you @agent_kith  Smile
Thanks!
 Reply
#2
(29-Oct-2020, 08:04 PM) merterbalci Wrote: Hello Snakeoilers Smile

I also asked this question to upmpdcli's coder J.F Dockes but is would not be enough...
The question is:  

"When i'm plug my two dacs at the same time to my Snakeoil os based streamer, Os accepts two of them. You know actually lms can give dac change possibility to user. My theory is if i modify the upmpdcli to accept two of my dacs, i can change my dacs on lms control client simultaneously. 
Is this possible?"

Especially the question is for you @agent_kith  Smile
Thanks!


That would be great to hear diferences between dacs in the fastest / easiest way possible. If someone change it for you you can even do a "Blind Test" between the two

I still have a Cambridge Audio Dacmagic100 and an HRT MusicStreammer III purely because i cannot decide witch one i prefer  Big Grin
Following the answer
 Reply
#3
(29-Oct-2020, 08:04 PM) merterbalci Wrote: Hello Snakeoilers Smile

I also asked this question to upmpdcli's coder J.F Dockes but is would not be enough...
The question is:  

"When i'm plug my two dacs at the same time to my Snakeoil os based streamer, Os accepts two of them. You know actually lms can give dac change possibility to user. My theory is if i modify the upmpdcli to accept two of my dacs, i can change my dacs on lms control client simultaneously. 
Is this possible?"

Especially the question is for you @agent_kith  Smile
Thanks!


Answer from Jean Francois (upmpdcli)

"I don't think it is, because there is no UPnP interface to do this. The
process which is choosing the output is MPD.

It's possible to define several audio outputs in the MPD configuration and
select one or several from an MPD client, but I'm even less of an expert on
this. In any case you can't do this through upmpdcli, it's impossible in
principle (with standard UPnP)."

It's clear now the keypoint is mpd.conf
http://mpd.wikia.com/wiki/Configuration#Audio_Outputs
But how? That's the new question Smile
 Reply
#4
(30-Oct-2020, 12:54 AM) merterbalci Wrote: It's clear now the keypoint is mpd.conf
http://mpd.wikia.com/wiki/Configuration#Audio_Outputs
But how? That's the new question Smile

That's where I will go first, as I reckon that is the easiest, but there are certain drawbacks, mainly because the audio output will not be in sync. But at least it gives you a PoC first step.

Once you get the PoC done, you may want to explore JACKd, or Pulse audio.

These two will do what you want. I personally think Pulse audio is detrimental to the sound, but I havn't tried JACKd yet. Look up on these two on the Internet, and see how it goes.

Technically you can use a computer and set it up as an active crossover. But it's not something I have explored myself.
Snakeoil Operating System - Music, your way!
 Reply
#5
(30-Oct-2020, 08:27 AM) agent_kith Wrote: ..mainly because the audio output will not be in sync.

Is this an inherent ALSA limitation? And JACK will solve this? And does it matter if source is PCM or DSD?

As you know, I asked about running 2 DACs from 2 USB ports simultaneously and thus, will be following this thread closely.
 Reply
#6
(30-Oct-2020, 08:27 AM) agent_kith Wrote:
(30-Oct-2020, 12:54 AM) merterbalci Wrote: It's clear now the keypoint is mpd.conf
http://mpd.wikia.com/wiki/Configuration#Audio_Outputs
But how? That's the new question Smile

That's where I will go first, as I reckon that is the easiest, but there are certain drawbacks, mainly because the audio output will not be in sync. But at least it gives you a PoC first step.

Once you get the PoC done, you may want to explore JACKd, or Pulse audio.

These two will do what you want. I personally think Pulse audio is detrimental to the sound, but I havn't tried JACKd yet. Look up on these two on the Internet, and see how it goes.

Technically you can use a computer and set it up as an active crossover. But it's not something I have explored myself.


That beats me Confused
Can you give me an code flow example about this? By the way i use the snakeoil in headless system so i have to use ssh codes... I'm not bad in theory but awful about coding Rolleyes
 Reply
#7
(30-Oct-2020, 02:13 PM) merterbalci Wrote: That beats me Confused
Can you give me an code flow example about this? By the way i use the snakeoil in headless system so i have to use ssh codes... I'm not bad in theory but awful about coding Rolleyes

Something like this: https://jackaudio.org/faq/multiple_devices.html
Snakeoil Operating System - Music, your way!
[-] The following 1 user Likes agent_kith's post:
  • merterbalci
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#8
(30-Oct-2020, 02:33 PM) agent_kith Wrote:
(30-Oct-2020, 02:13 PM) merterbalci Wrote: That beats me Confused
Can you give me an code flow example about this? By the way i use the snakeoil in headless system so i have to use ssh codes... I'm not bad in theory but awful about coding Rolleyes

Something like this: https://jackaudio.org/faq/multiple_devices.html


And i need a little support about creation of PoC please Tumble Weeds Sorry if i'm too demanding. Sad
 Reply
 

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