Re: [Alsa-user] splitting a 4 channel usb sound card into master and headphone

[Charles M. <key...@gm...>]

Hi Samuel.

I think I have a similar problem with the Audient iD14
<https://audient.com/products/audio-interfaces/id14/overview/>. Maybe we
could collaborate?

I haven't received many responses from the mailing list, so grateful for
Robert Bielik's suggestion.

Looks like the dshare
<http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html#pcm_plugins_dshare>
plugin
has some parameters I'm not familiar with. What's new?! :-) Hope I can find
information to demystify. Will share when I do. Please do the same.

As a backup I have started reading Linux Device Drivers
<https://lwn.net/Kernel/LDD3/> and have asked Audient for their help.

Here are some other resources I have found.

A close look at ALSA <http://www.volkerschatz.com/noise/alsa.html>
Linux ALSA sound notes <http://www.sabi.co.uk/Notes/linuxSoundALSA.html>
Writing an ALSA Driver
<http://www.alsa-project.org/~tiwai/writing-an-alsa-driver/index.html>
ALSA Runtime arguments in configuration files
<http://www.alsa-project.org/alsa-doc/alsa-lib/confarg.html>

My strategy has just been to read and reread and keep trying to figure it
out. I imagine it's going to take some time. :-)

Charles

On Thu, Feb 1, 2018 at 11:09 PM Samuel Nicholas <nic...@gm...>
wrote:

> Hi,
>
> I have a Pioneer DDJ-WeGO, 4 channel USB device that outputs stereo
> master and stereo headphone.
> I've been scouring the internet trying to find out how I can possibly
> split up the ports as it presents as a surround 4.0 device.
>
> So far I've come up with nothing except an remapping in pulseaudio
> that is super ugly to use.
> I really would like to solve this at the lowest possible layer.
>
> U have udev rules to discriminate the device working fine.
>
> Is there any way to do this with alsa?
>
> Cheers for any help,
> Samuel.
>
>
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-- 
Charles Mulder
Software Engineer/Musician
mobile: +27 83 653 3698
phone: +27 27 948 2592
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