Re: [Alsa-devel] Re: [OT] ALSA userspace API complexity

John Rigg
2006-01-10T01:51:35Z

On Tue, Jan 10, 2006 at 02:48:35AM +0200, Hannu Savolainen wrote:
> On Mon, 9 Jan 2006, John Rigg wrote:
>
> > Yes, but the CPU has plenty of other work to do. The sound cards that
> > would be worst affected by this are the big RME cards (non-interleaved) and
> > multiple ice1712 cards (non-interleaved blocks of interleaved data),
> ice1712 uses normal interleaving. There are no "non-interleaved blocks".

With two ice1712 cards I had to patch jackd for MMAP_COMPLEX
support to make them work together. My understanding was that the
individual cards use interleaved data, but when several are combined
the resulting blocks of data are not interleaved together. I realise the
usual way of dealing with this is to use the alsa route plugin with
ttable to interleave them, but I couldn't get it to work with these
cards.

John