From mboxrd@z Thu Jan 1 00:00:00 1970 From: Randy Cushman Subject: Re: Inexplicable mixer control creation Date: Fri, 16 Mar 2007 13:45:08 -0400 Message-ID: <45FAD7A4.4040408@earthlink.net> References: <45F1830D.9020609@earthlink.net> <45F73FF4.1000902@earthlink.net> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1425991865==" Return-path: Received: from mta9.adelphia.net (mta9.adelphia.net [68.168.78.199]) by alsa0.perex.cz (Postfix) with ESMTP id 6F84E245DA for ; Fri, 16 Mar 2007 18:45:25 +0100 (CET) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@lists.sourceforge.net Errors-To: alsa-devel-bounces@lists.sourceforge.net To: Takashi Iwai Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org This is a multi-part message in MIME format. --===============1425991865== Content-Type: multipart/alternative; boundary="------------090109070200040707030301" This is a multi-part message in MIME format. --------------090109070200040707030301 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Takashi Iwai wrote: > At Tue, 13 Mar 2007 20:21:08 -0400, > Randy Cushman wrote: > >> In attempting to implement my proposed mixer control name changes (see >> "[Alsa-devel] RFC: Enhance AD AC '97 mixer control names") I have >> encountered behavior that makes no sense to me: If module >> snd_ac97_codec does not create a control with the name 'PCM Playback >> Volume' then something else creates a control with that name. Not >> surprisingly, this phantom control serves no useful purpose in my >> environment, as it has no affect on AC '97 control registers. >> > > This is done by softvol plugin used in the default configuration for > many onboard chip drivers. See alsa-lib/src/conf/cards/*.conf. > > I haven't spent much time in alsa-lib. I'll take a look. This may be a good time to mention that I am unable to access the Mercurial repository. If I try to access http://hg-mirror.alsa-project.org in a web browser or use the "hg clone" command, I get "HTTP Error 403: Forbidden". Curiously, I can "hg diff" repositories I cloned previously. (I opened bugtrack ticket #2956 this morning.) In the mean time, I'll look at alsa-lib-1.0.14rc3. > That's actually a point that I missed. Many apps assume either > "Master" or "PCM" mixer exists. Thus, removing PCM isn't nice for > them. > > > Now I'm considering whether changing the volume names in the driver > level is actually a better choice. It's basically simpler, and I > prefer a simpler solution. OTOH, it may bring other messes because of > the name incompatibility like above. So, the cleanest solution would > be some mangling in the user-space, i.e. inside alsa-lib. But, it's > a bit harder way. > > I was planning to change the names by calling snd_ac97_rename_vol_ctl() from functions patch_ad1986_specific(), etc. in ac97_patch.c. I'll explore the alsa-lib approach. > So, before doing this -- we have to *seriously* consider to get > consensus what control names should be used as standard and how they > behave. Maybe better to start another thread for discussing this... > > I can start another thread. > Takashi > > > --------------090109070200040707030301 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Takashi Iwai wrote:

At Tue, 13 Mar 2007 20:21:08 -0400,
Randy Cushman wrote:

In attempting to implement my proposed mixer control name changes (see 
"[Alsa-devel] RFC: Enhance AD AC '97 mixer control names") I have 
encountered behavior that makes no sense to me:  If module 
snd_ac97_codec does not create a control with the name 'PCM Playback 
Volume' then something else creates a control with that name.  Not 
surprisingly, this phantom control serves no useful purpose in my 
environment, as it has no affect on AC '97 control registers.


This is done by softvol plugin used in the default configuration for
many onboard chip drivers.  See alsa-lib/src/conf/cards/*.conf.

I haven't spent much time in alsa-lib. I'll take a look.

This may be a good time to mention that I am unable to access the Mercurial repository. If I try to access http://hg-mirror.alsa-project.org in a web browser or use the "hg clone" command, I get "HTTP Error 403: Forbidden". Curiously, I can "hg diff" repositories I cloned previously. (I opened bugtrack ticket #2956 this morning.)

In the mean time, I'll look at alsa-lib-1.0.14rc3.

That's actually a point that I missed.  Many apps assume either
"Master" or "PCM" mixer exists.  Thus, removing PCM isn't nice for
them. 


Now I'm considering whether changing the volume names in the driver
level is actually a better choice.  It's basically simpler, and I
prefer a simpler solution.  OTOH, it may bring other messes because of
the name incompatibility like above.  So, the cleanest solution would
be some mangling in the user-space, i.e. inside alsa-lib.  But, it's
a bit harder way.

I was planning to change the names by calling snd_ac97_rename_vol_ctl() from functions patch_ad1986_specific(), etc. in ac97_patch.c. I'll explore the alsa-lib approach.

So, before doing this -- we have to *seriously* consider to get
consensus what control names should be used as standard and how they
behave.  Maybe better to start another thread for discussing this...

I can start another thread.

Takashi

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