[Jackit-devel] [linux-audio-dev] Re: Multiplexing 4 channels on SPDIF

[Paul Davis]

On Mon, 2006-10-30 at 18:52 +0100, Fons Adriaensen wrote:

> 
>   -  hardware presents itself as 2 * 96 kHz
>   -  user wants to see a device with 4 * 48 kHz.

interestingly, ADAT devices do the opposite to get to SR's above 48kHZ:

	- hardware runs as N * 48 kHz channels
        - data is multiplexed across 2 channels at once
	- user sees N/2 channels at 96kHz

this is not done with ALSA plugins, but in the driver.

note that JACK wants if possible to sit close to the h/w, so an ALSA
plugin is not ideal. JACK uses mmap to read/write data from/to the
device, so the work of an ALSA plugin is hard ...

--p