Re: How to display mixer controls to the user? was:Re: [PATCH/RFC] emu10k1 multichannel PCM

[Takashi Iwai <tiwai@suse.de>]

At Sun, 14 Nov 2004 11:36:30 +0000,
James Courtier-Dutton wrote:
> 
> Lee Revell wrote:
> > On Fri, 2004-11-12 at 18:07 -0500, Lee Revell wrote:
> > 
> >>This patch is still missing a few things, like dynamic voice allocation
> >>and correctly setting the send routing, but it does work with JACK, and
> >>should not interfere with the operation of the other devices.   I tested
> >>it like so:
> > 
> > 
> > Here is a patch that adds the mixer controls for this device.  This
> > includes the previous patches (add multichannel support and add register
> > dump to /proc)  Unfortunately this adds 16 x 3 mixer controls... people
> > complain enough about the emu10k1 mixer already, so this might not be
> > well received in some circles.  I am not sure what to do about this.
> > The kX mixer probably has hundreds of controls, but they are arranged in
> > a tree structure.
> > 
> 
> I have similar problems with the mixer controls. If I add 
> p16v(24bit/96khz etc.) support to the emu10k1 driver, it will add a load 
> more controls. For example, the volume controls for the 96khz channel 
> are separate from the volume controls for emu10k1 48khz channels.
> Maybe we need to start discussing ways to separate out mixer controls 
> better.
> E.g.
> Global controls.
> Controls specific to a pcm device.
> Controls specific to a particular section of DSP code.

They can be specified via different iface values.  For example, the
above cases can be distinct with IFACE_MIXER, IFACE_PCM and IFACE_CARD
(or HWDEP), respectively.

IMO, the emu10k1 routing should go to IFACE_PCM instead of
IFACE_MIXER.  (Who wants to change it on the mixer?)
Well, we have to be still careful about the compatibility, though...


Takashi


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