[PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Mikael Magnusson]

[-- Attachment #1: Type: text/plain, Size: 307 bytes --]

This is the first in a set of five patches that add master volume and 
switch controls and front pcm channels via fxbus 8,9 to SB Live.

master_volume.patch:

Adds "Master Digital Playback Volume" which controls all six pcm 
playback channels.

Signed-Off-By: Mikael Magnusson <mikma@users.sourceforge.net>

[-- Attachment #2: master_volume.patch --]
[-- Type: text/x-patch, Size: 1020 bytes --]

diff -u alsa-kernel/pci/emu10k1/emufx.c alsa-kernel/pci/emu10k1/emufx.c
--- alsa-kernel/pci/emu10k1/emufx.c	21 Feb 2005 13:33:30 -0000
+++ alsa-kernel/pci/emu10k1/emufx.c	21 Feb 2005 13:33:52 -0000
@@ -934,7 +934,7 @@
 	return err;
 }
 
-#define SND_EMU10K1_GPR_CONTROLS	41
+#define SND_EMU10K1_GPR_CONTROLS	43
 #define SND_EMU10K1_INPUTS		10
 #define SND_EMU10K1_PLAYBACK_CHANNELS	8
 #define SND_EMU10K1_CAPTURE_CHANNELS	4
@@ -1780,6 +1780,19 @@
 	}
 
 	/*
+	 * Master Volume
+	 */
+	for (z = 0; z < 6; z++) {
+		SWITCH(icode, &ptr, playback + z, playback + z, gpr + 0);
+		VOLUME(icode, &ptr, playback + z, playback + z, gpr + 1);
+	}
+
+	snd_emu10k1_init_mono_onoff_control(controls + i++, "Master Digital Playback Switch", gpr + 0, 0);
+	snd_emu10k1_init_mono_control(controls + i++, "Master Digital Playback Volume", gpr + 1, 0);
+	gpr += 2;
+
+
+	/*
 	 *  Process tone control
 	 */
 	OP(icode, &ptr, iACC3, GPR(playback + SND_EMU10K1_PLAYBACK_CHANNELS + 0), GPR(playback + 0), C_00000000, C_00000000); /* left */

Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Jaroslav Kysela]

On Mon, 21 Feb 2005, Mikael Magnusson wrote:

> This is the first in a set of five patches that add master volume and 
> switch controls and front pcm channels via fxbus 8,9 to SB Live.

I still feel that it's broken idea. We have also problems with AC97
where the surround/center&lfe volumes are separate from AC97 Master Volume
control, too (at least for Sigmatel codecs).

We need a layer in user space to handle these issues where we can express
the control relations in very easy way and not mess the kernel with more 
dust which is not necessary.

It might be easy to write a small daemon which will create "Master Volume" 
control for SB cards at this time until a decent solution in alsa-lib is 
finished.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs


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Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Jaroslav Kysela]

On Tue, 22 Feb 2005, Mikael Magnusson wrote:

> Jaroslav Kysela wrote:
> > On Mon, 21 Feb 2005, Mikael Magnusson wrote:
> > 
> > 
> >>This is the first in a set of five patches that add master volume and 
> >>switch controls and front pcm channels via fxbus 8,9 to SB Live.
> > 
> > 
> > I still feel that it's broken idea. We have also problems with AC97
> > where the surround/center&lfe volumes are separate from AC97 Master Volume
> > control, too (at least for Sigmatel codecs).
> > 
> > We need a layer in user space to handle these issues where we can express
> > the control relations in very easy way and not mess the kernel with more 
> > dust which is not necessary.
> > 
> > It might be easy to write a small daemon which will create "Master Volume" 
> > control for SB cards at this time until a decent solution in alsa-lib is 
> > finished.
> > 
> > 						Jaroslav
> > 
> 
> I think a "Master Digital Volume" or separate controls for surround, 
> center and lfe are needed.
> 
> How are you otherwise going to implement a "Master Volume" control in 
> user space if you allow the user to change for example "Wave Surround" 
> and "Surround"?

As you noted here, the implemention of Master is only one abstraction view 
for this device. Other users might use the card as two virtual PCM devices 
(front = card1, rear = card2) and in this case is Master completely 
useless for this example.

The control API allow to lock the specific control for writing (and only 
application which locked the control can write to it), thus the user space 
implementation can use this feature.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs


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Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Mikael Magnusson]

Jaroslav Kysela wrote:
> On Mon, 21 Feb 2005, Mikael Magnusson wrote:
> 
> 
>>This is the first in a set of five patches that add master volume and 
>>switch controls and front pcm channels via fxbus 8,9 to SB Live.
> 
> 
> I still feel that it's broken idea. We have also problems with AC97
> where the surround/center&lfe volumes are separate from AC97 Master Volume
> control, too (at least for Sigmatel codecs).
> 
> We need a layer in user space to handle these issues where we can express
> the control relations in very easy way and not mess the kernel with more 
> dust which is not necessary.
> 
> It might be easy to write a small daemon which will create "Master Volume" 
> control for SB cards at this time until a decent solution in alsa-lib is 
> finished.
> 
> 						Jaroslav
> 

I think a "Master Digital Volume" or separate controls for surround, 
center and lfe are needed.

How are you otherwise going to implement a "Master Volume" control in 
user space if you allow the user to change for example "Wave Surround" 
and "Surround"?

/Mikael


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Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Mikael Magnusson]

Jaroslav Kysela wrote:
> On Tue, 22 Feb 2005, Mikael Magnusson wrote:
> 
> 
>>Jaroslav Kysela wrote:
>>
...
>>
>>I think a "Master Digital Volume" or separate controls for surround, 
>>center and lfe are needed.
>>
>>How are you otherwise going to implement a "Master Volume" control in 
>>user space if you allow the user to change for example "Wave Surround" 
>>and "Surround"?
> 
> 
> As you noted here, the implemention of Master is only one abstraction view 
> for this device. Other users might use the card as two virtual PCM devices 
> (front = card1, rear = card2) and in this case is Master completely 
> useless for this example.
> 
> The control API allow to lock the specific control for writing (and only 
> application which locked the control can write to it), thus the user space 
> implementation can use this feature.
> 
> 						Jaroslav

And how do I adjust the rear, center and lfe volumes if the controls are 
locked? Should I have to use the soft volume plugin?

/Mikael


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Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Jaroslav Kysela]

On Tue, 22 Feb 2005, Mikael Magnusson wrote:

> Jaroslav Kysela wrote:
> > On Tue, 22 Feb 2005, Mikael Magnusson wrote:
> > 
> > 
> >>Jaroslav Kysela wrote:
> >>
> ...
> >>
> >>I think a "Master Digital Volume" or separate controls for surround, 
> >>center and lfe are needed.
> >>
> >>How are you otherwise going to implement a "Master Volume" control in 
> >>user space if you allow the user to change for example "Wave Surround" 
> >>and "Surround"?
> > 
> > 
> > As you noted here, the implemention of Master is only one abstraction view 
> > for this device. Other users might use the card as two virtual PCM devices 
> > (front = card1, rear = card2) and in this case is Master completely 
> > useless for this example.
> > 
> > The control API allow to lock the specific control for writing (and only 
> > application which locked the control can write to it), thus the user space 
> > implementation can use this feature.
> > 
> > 						Jaroslav
> 
> And how do I adjust the rear, center and lfe volumes if the controls are 
> locked? Should I have to use the soft volume plugin?

You may create new rear/center/lfe volume controls in user space and 
define expression:

hw volume = master volume * output specific volume

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs


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Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Lee Revell]

On Tue, 2005-02-22 at 09:31 +0100, Jaroslav Kysela wrote:
> On Mon, 21 Feb 2005, Mikael Magnusson wrote:
> 
> > This is the first in a set of five patches that add master volume and 
> > switch controls and front pcm channels via fxbus 8,9 to SB Live.
> 
> I still feel that it's broken idea. We have also problems with AC97
> where the surround/center&lfe volumes are separate from AC97 Master Volume
> control, too (at least for Sigmatel codecs).
> 
> We need a layer in user space to handle these issues where we can express
> the control relations in very easy way and not mess the kernel with more 
> dust which is not necessary.
> 
> It might be easy to write a small daemon which will create "Master Volume" 
> control for SB cards at this time until a decent solution in alsa-lib is 
> finished.

I believe Mikael's patch is correct.  At least, partially.

There are two separate issues that the patch addresses.  One is that
unlike the Audigy configuration, the driver does not use separate FX
buses for front output and PCM.  So attenuating the front channels will
attenuate *all* PCM samples.  This has to be fixed in the driver.  And
it's essentially zero cost as the extra FX buses and GPRs are available.

The other issue is the lack of a master volume control.  Provided the
first issue is addressed, perex is correct in that this can be solved in
userspace.

Personally I feel that the entire patch should be applied, until the
required abstraction layer exists in alsa-lib.  The second part of the
patch can be trivially reverted when this is available.

Mikael, can you split your patch into the part that moves PCM and front
to separate FX buses, and the part that adds the master volume?

Lee



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Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Jaroslav Kysela]

On Tue, 22 Feb 2005, Lee Revell wrote:

> There are two separate issues that the patch addresses.  One is that
> unlike the Audigy configuration, the driver does not use separate FX
> buses for front output and PCM.  So attenuating the front channels will
> attenuate *all* PCM samples.  This has to be fixed in the driver.  And
> it's essentially zero cost as the extra FX buses and GPRs are available.

Sorry, but I don't understand very well why we need to have "PCM mix" FX
buses. We can do this "down-mix" in the DSP code, but it's better to do it
in application. My original DSP code for emu10k1 have only front, rear,
center+lfe FX buses (6). I must miss something important here.

> The other issue is the lack of a master volume control.  Provided the
> first issue is addressed, perex is correct in that this can be solved in
> userspace.
> 
> Personally I feel that the entire patch should be applied, until the
> required abstraction layer exists in alsa-lib.  The second part of the
> patch can be trivially reverted when this is available.

Maybe..

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs


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Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Mikael Magnusson]

Jaroslav Kysela wrote:
> On Tue, 22 Feb 2005, Lee Revell wrote:
> 
> 
>>There are two separate issues that the patch addresses.  One is that
>>unlike the Audigy configuration, the driver does not use separate FX
>>buses for front output and PCM.  So attenuating the front channels will
>>attenuate *all* PCM samples.  This has to be fixed in the driver.  And
>>it's essentially zero cost as the extra FX buses and GPRs are available.
> 
> 
> Sorry, but I don't understand very well why we need to have "PCM mix" FX
> buses. We can do this "down-mix" in the DSP code, but it's better to do it
> in application. My original DSP code for emu10k1 have only front, rear,
> center+lfe FX buses (6). I must miss something important here.
> 

I don't understand what you mean with "PCM mix". Are you thinking of the 
default output which are up-mixed to 5.1? The patch doesn't down-mix 5.1 
to front or something like that. It adds two fx inputs that are routed 
to front only and not up-mixed to 5.1. This is how the Audigy driver 
works. It also can make the configuration file a little cleaner, since 
it doesn't have to mute the up-mixed outputs.

/Mikael


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Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Jaroslav Kysela]

On Wed, 23 Feb 2005, Mikael Magnusson wrote:

> > Sorry, but I don't understand very well why we need to have "PCM mix" FX
> > buses. We can do this "down-mix" in the DSP code, but it's better to do it
> > in application. My original DSP code for emu10k1 have only front, rear,
> > center+lfe FX buses (6). I must miss something important here.
> > 
> 
> I don't understand what you mean with "PCM mix". Are you thinking of the 
> default output which are up-mixed to 5.1? The patch doesn't down-mix 5.1 
> to front or something like that. It adds two fx inputs that are routed 
> to front only and not up-mixed to 5.1. This is how the Audigy driver 
> works. It also can make the configuration file a little cleaner, since 
> it doesn't have to mute the up-mixed outputs.

I see now. My behaviour was to "duplicate" front to surround with "Wave 
Surround" controls and you propose to have FX buses which will route 
signal to both front & rear and separate FX buses to route signal to 
front only.

I don't see the real benefit. Both cases are correct and the alsa-lib
configuration won't be much different. Anyway, if you feel that it's
better, then go ahead...

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs


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Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Takashi Iwai]

At Wed, 23 Feb 2005 10:00:49 +0100 (CET),
Jaroslav wrote:
> 
> On Wed, 23 Feb 2005, Mikael Magnusson wrote:
> 
> > > Sorry, but I don't understand very well why we need to have "PCM mix" FX
> > > buses. We can do this "down-mix" in the DSP code, but it's better to do it
> > > in application. My original DSP code for emu10k1 have only front, rear,
> > > center+lfe FX buses (6). I must miss something important here.
> > > 
> > 
> > I don't understand what you mean with "PCM mix". Are you thinking of the 
> > default output which are up-mixed to 5.1? The patch doesn't down-mix 5.1 
> > to front or something like that. It adds two fx inputs that are routed 
> > to front only and not up-mixed to 5.1. This is how the Audigy driver 
> > works. It also can make the configuration file a little cleaner, since 
> > it doesn't have to mute the up-mixed outputs.
> 
> I see now. My behaviour was to "duplicate" front to surround with "Wave 
> Surround" controls and you propose to have FX buses which will route 
> signal to both front & rear and separate FX buses to route signal to 
> front only.
> 
> I don't see the real benefit. Both cases are correct and the alsa-lib
> configuration won't be much different. Anyway, if you feel that it's
> better, then go ahead...

IIRC, the problem was stated in the case that both front and
multi-channel streams are output at the same time.

I think this patch is fine (although not tested yet).  At least, it
will decrease the difference between Live and Audigy.


Takashi


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Re: [PATCH 1/5] emu10k1 SB Live: Master volume and front channels via fxbus 8,9

[Lee Revell]

On Wed, 2005-02-23 at 11:22 +0100, Takashi Iwai wrote:
> IIRC, the problem was stated in the case that both front and
> multi-channel streams are output at the same time.
> 
> I think this patch is fine (although not tested yet).  At least, it
> will decrease the difference between Live and Audigy.

Agreed.  This should be applied, as soon as we have some successful test
reports.  I would like for it to be in 1.0.9.  But we should be careful
as so many patches will have gone into the emu10k1 driver since 1.0.8.

I'll test this on my SBLive this weekend.  And update some of the bug
reports so the users who were really bothered by this can give some
feedback.

Lee





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