From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Rigg Date: Tue, 10 Jan 2006 01:51:35 +0000 Subject: Re: [Alsa-devel] Re: [OT] ALSA userspace API complexity Message-Id: <20060110020017.GB5375@localhost.localdomain> List-Id: References: <20050726150837.GT3160@stusta.de> <200601091405.23939.rene@exactcode.de> <200601091812.55943.rene@exactcode.de> <20060109232043.GA5013@localhost.localdomain> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Hannu Savolainen Cc: John Rigg , David Lang , =?iso-8859-1?Q?Ren=E9?= Rebe , Jaroslav Kysela , Takashi Iwai , linux-sound@vger.kernel.org, ALSA development , LKML 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