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

From: Paul Davis <paul@email-addr-hidden>
Date: Mon Oct 30 2006 - 21:55:33 EET

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
Received on Tue Oct 31 00:15:02 2006

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