From mboxrd@z Thu Jan  1 00:00:00 1970
From: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Subject: Re: Couple of questions
Date: Fri, 17 Mar 2006 20:27:32 +0000
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To: Takashi Iwai <tiwai@suse.de>
Cc: Lee Revell <rlrevell@joe-job.com>, alsa-devel@alsa-project.org
List-Id: alsa-devel@alsa-project.org

On Fri, 2006-03-17 at 11:13 +0100, Takashi Iwai wrote:

> 
> The period size is same, but the copy is not done like LLLLRRRR.
> 
> As default, the whole buffer is divided to number of channels.  For
> example, using two channels,
> 
> 	|LLLLLLL..|RRRRRRR....|
> 	|<--- buffer_size --->|
> 
> and using six channels,
> 
> 	|1111....|2222....|.....|6666....|
> 	|<-------- buffer_size --------->|
> 
> where each channel has a length of (period_size * periods) samples.
> Unless the buffer size is changed, this assignment of each channel
> also isn't changed.
> 
> The above is the default behavior.  You can change the assignment as
> you like by defining proper copy and silence callback, too.  For
> mmap, you need to define CHANNEL_INFO ioctl, too.
> 

Presumably this is what happens at the start, but when doing a single
period update presumably it is split LLLLRRRR on non interleaved



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