Re: Couple of questions

[Takashi Iwai <tiwai@suse.de>]

At Fri, 17 Mar 2006 20:27:32 +0000,
Adrian McMenamin wrote:
> 
> 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

No, as I wrote in the above, the assignment of each channel isn't
changed, i.e. the buffer position of each channel remains.

The middle layer handles the whole buffer simply as a bundle of
multiple mono streams.


Takashi


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