[AudioI] Octo: easiest way to perform a basic demonstration of all inputs and outputs

[Marc Lavallée]

Hi Chris,

I'm not from the AudioInjector team (so don't take my advice as 
authoritative).

My comprehension of audio on Linux is that if an ALSA device is opened 
for output (or input), for example using a sound file player, it can't 
be used by a second application (or process).

Usually a sound server is required, that sits on top of ALSA. It can be 
Pulseaudio, Jack or PipeWire (but it's not yet mainstream).
For anything serious, I have a preference for Jack, and Pulseaudio can 
be used along with Jack.
The signal flow would then be: Octo <-> ALSA <-> Jack <-> Pulseaudio

Marc

Le 2022-04-22 à 14 h 58, Chris Fernandez via People a écrit :
> Hello,
>
> I recently purchased an Octo and I am trying to demonstrate its 
> capabilities. I have connected it to a Raspberry Pi 3B+ with a fresh 
> install of Raspbian (v11). I've gone through the GitHub octo 
> installation instructions, and I have been able to play 1x audio 
> output from the AudioInjector card. Sound quality is good!
>
> However, I am struggling to get more than one audio output working at 
> a time. I've tried opening multiple instances of VLC media player to 
> play two different audio files. This works if I send one audio stream 
> to the AudioInjector, and another to HDMI. However, the AudioInjector 
> is only showing up as a single audio sink. I don't see how I can send 
> other audio streams to the other channels of the AudioInjector.
>
> I have spent a few days looking into this, and playing around with 
> aplay and other Asla tools. No luck for me so far.
>
> Is the basic installation from GitHub intended to default to a 1x 
> output mode? Are there other steps I need to do to enable multiple 
> independent outputs? Is there something like a tutorial or demo that I 
> could use to validate the hardware and test operation with 6x inputs 
> and 8x outputs? What is the easiest way to test the full functionality 
> of the Octo board?
>
> Any guidance would be greatly appreciated! Thanks in advance!
>
>      -Chris
>
> -- 
> Chris Fernandez
> chris at hardline.io
> 518-242-6475
> Hardline, Inc.
> 112 South Park Street
> San Francisco, CA 94107
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.audioinjector.net/pipermail/people/attachments/20220422/b329a0bc/attachment-0001.htm>