Status of USB audio class 2 drivers in ALSA

Status of USB audio class 2 drivers in ALSA

[Anand Joseph]

I am working on building a multi-channel USB audio device using the
PIC32MX2 series with dual WM8731 audio codecs. The goal is a low cost
4 channel USB audio device. While this might not be the best
combination for
multi-channel audio, I do not have a better solution as the XMOS
series is not easily available in India. I would like to know the
status of USB audio class 2 support in ALSA and is there anyway I can
contribute. I did go through the USB specifications for audio class 2
devices, but an idea of the implementation in ALSA would help in
writing the firmware.

Regards,

Anand

Re: Status of USB audio class 2 drivers in ALSA

[Daniel Mack]

On 15.07.2012 23:03, Anand Joseph wrote:
> I am working on building a multi-channel USB audio device using the
> PIC32MX2 series with dual WM8731 audio codecs. The goal is a low cost
> 4 channel USB audio device. While this might not be the best
> combination for
> multi-channel audio, I do not have a better solution as the XMOS
> series is not easily available in India. I would like to know the
> status of USB audio class 2 support in ALSA and is there anyway I can
> contribute. I did go through the USB specifications for audio class 2
> devices, but an idea of the implementation in ALSA would help in
> writing the firmware.

UAC2 is mostly supported in ALSA since a while. Things that are missing
are exotic features like complex clock infrastructure handling and some
mixer extension units that haven't been observed in the wild yet.

In any case, the support that is there already is more than enough to
support a simple streaming device like the one you have in mind.

Let us know how your project goes and if you encounter any problems with
the drivers.


Daniel