How to select different S/PDIFoutput ports on a SBLive!

How to select different S/PDIFoutput ports on a SBLive!

[Gerard Janssen]

Hi,

Some time ago, I posted a similar message, but I never got a reply.

The SBLive! card can support four SPDIF output channels, indicated as
SPDIF#0 - 3, which are located on the 12 pins or the 40 pins external
connector (depending on the type of card).
When I play a file to "spdif" or "iec958:AES0=0x42,AES1 = 0x82,AES2 =
0x02,AES3 = 0x02", the signal is send to the SPDIF#1 output. When I use
"front" or "center_lfe", I can get music out of SPDIF#0-3 depending on the
ALSA-mixer settings, however, the way the settings have to be chosen is not
straight forward (trial and error). So apparently all SPDIF outputs are
"available".

I would like to select/address all four SPDIF outputs of the SBLive! card.
Now I have the following questions:

1. How can the SPDIF output port be changed when using the "spdif" or
"iec958" in the alsa player. I tried to change the channel value of AES2,
but this had no effect at all.

2. I tried to find the location where the SPDIF output port is set in the
alsa code for the emu10k1. I also searched the emufx-code, since the spdif
outputs come directly from the fx8010 processor, but I did not find it.
Where is the SPDIF output port set? How can it be changed?

B.t.w. I did find only three SPDIF channel status registers (SPCS0-2). Why
are there only three SPCS's in stead of four?

Gerard Janssen 




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Re: [Alsa-user] How to select different S/PDIFoutput ports on a SBLive!

[Jaroslav Kysela]

On Sat, 31 Aug 2002, Gerard Janssen wrote:

> Hi,
> 
> Some time ago, I posted a similar message, but I never got a reply.
> 
> The SBLive! card can support four SPDIF output channels, indicated as
> SPDIF#0 - 3, which are located on the 12 pins or the 40 pins external
> connector (depending on the type of card).
> When I play a file to "spdif" or "iec958:AES0=0x42,AES1 = 0x82,AES2 =
> 0x02,AES3 = 0x02", the signal is send to the SPDIF#1 output. When I use
> "front" or "center_lfe", I can get music out of SPDIF#0-3 depending on the
> ALSA-mixer settings, however, the way the settings have to be chosen is not
> straight forward (trial and error). So apparently all SPDIF outputs are
> "available".
> 
> I would like to select/address all four SPDIF outputs of the SBLive! card.
> Now I have the following questions:
> 
> 1. How can the SPDIF output port be changed when using the "spdif" or
> "iec958" in the alsa player. I tried to change the channel value of AES2,
> but this had no effect at all.

It's not possible. Actually, DSP code supports optical and coaxial digital 
outs for LiveDrive, but I haven't information about physical connections 
for them by hand.

> 2. I tried to find the location where the SPDIF output port is set in the
> alsa code for the emu10k1. I also searched the emufx-code, since the spdif
> outputs come directly from the fx8010 processor, but I did not find it.
> Where is the SPDIF output port set? How can it be changed?

Look for EXTIN_TOSLINK_L and EXTIN_COAX_SPDIF_L in emufx.c

> B.t.w. I did find only three SPDIF channel status registers (SPCS0-2). Why
> are there only three SPCS's in stead of four?

I think that the emu10k1 chip shomehow merges signals from two S/PDIF 
inputs into one.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project  http://www.alsa-project.org
SuSE Linux    http://www.suse.com



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Re: Re: [Alsa-user] How to select different S/PDIFoutput ports on a SBLive!

[Gerard Janssen]

Hi Jaroslav,

>> The SBLive! card can support four SPDIF output channels, indicated as
>> SPDIF#0 - 3, which are located on the 12 pins or the 40 pins external
>> connector (depending on the type of card).
>> When I play a file to "spdif" or "iec958:AES0=0x42,AES1 = 0x82,AES2 =
>> 0x02,AES3 = 0x02", the signal is send to the SPDIF#1 output. When I use
>> "front" or "center_lfe", I can get music out of SPDIF#0-3 depending on the
>> ALSA-mixer settings, however, the way the settings have to be chosen is not
>> straight forward (trial and error). So apparently all SPDIF outputs are
>> "available".
>> 
>> I would like to select/address all four SPDIF outputs of the SBLive! card.
>> Now I have the following questions:
>> 
>> 1. How can the SPDIF output port be changed when using the "spdif" or
>> "iec958" in the alsa player. I tried to change the channel value of AES2,
>> but this had no effect at all.
>
>It's not possible. Actually, DSP code supports optical and coaxial digital 
>outs for LiveDrive, but I haven't information about physical connections 
>for them by hand.
>
>> 2. I tried to find the location where the SPDIF output port is set in the
>> alsa code for the emu10k1. I also searched the emufx-code, since the spdif
>> outputs come directly from the fx8010 processor, but I did not find it.
>> Where is the SPDIF output port set? How can it be changed?
>
>Look for EXTIN_TOSLINK_L and EXTIN_COAX_SPDIF_L in emufx.c
>
>> B.t.w. I did find only three SPDIF channel status registers (SPCS0-2). Why
>> are there only three SPCS's in stead of four?
>
>I think that the emu10k1 chip shomehow merges signals from two S/PDIF 
>inputs into one.

I tried to find the spdif output port addresses by changing the register
addresses of EXTOUT_TOSLINK_L/R in emu10k1.h to all 16 possible output
address pairs between (00 - 1f). To do this, I removed the extout_mask
check in emufx.c in the piece of code given below. I found the addresses of
the four spdif output ports of the SBLive! card (I did/could not check this
for the Audigity) and they are as follows: spdifo#0 = (0x02,0x03), which is
the standard output, spdifo#1 = (0x04,0x05), spdifo#2 = (0x06,0x07) and
spdifo#3 = (0x08,0x09).

So in principle it seems to be possible to create 8 digital output channels
on the SBLive!, however at the cost of some of its standard
functionalities, namely the outputs of the center_lfe, headphone and rear
channels to the LiveDrive (I think?). 

Now, I would like to implement three additional spdif outputs in the same
way as the standard output, so without volume or tone control. I think,
this is an interesting extension of the functionality of the SBLive, since
by creating 8 independent digital outputs we get a functionality on a cheap
soundcard which is now only available at expensive (professional) soundcards.
The problem is that I am not a programmer, however, I would like to give it
a try where any help from the ALSA community is very much appreciated. I
have the following questions:

1. Is the code related to the standard spdif output in emufx.c, limited to
the following code lines or is there other code involved?
	if (emu->fx8010.extout_mask &
((1<<EXTOUT_TOSLINK_L)|(1<<EXTOUT_TOSLINK_R))) {
		/* IEC958 Optical Raw Playback Switch */

		for (z = 0; z < 2; z++) {
			SWITCH(icode, &ptr, tmp + 0, 8 + z, gpr + z);
			SWITCH_NEG(icode, &ptr, tmp + 1, gpr + z);
			SWITCH(icode, &ptr, tmp + 1, playback + SND_EMU10K1_PLAYBACK_CHANNELS +
z, tmp + 1);
			OP(icode, &ptr, iACC3, EXTOUT(EXTOUT_TOSLINK_L + z), GPR(tmp + 0),
GPR(tmp + 1), C_00000000);
		}
		snd_emu10k1_init_stereo_onoff_control(controls + i++, "IEC958 Optical Raw
Playback Switch", gpr, 0);
		gpr += 2;
	}

2. To what address does "tmp" refer in the OP instruction above?

3. Do I need to implement additional "Process FX Buses" (now there are 9
buses, indicated as GPR(0) - GPR(9), where GPR(8) and GPR(9) have the
comment S/PDIF left/right)?

4. I thought that the spdif channel status registers SPCS0-3 (I added an
SPCS3 on address 0x57 in emu10k1.h) were initialized in emu10k1_main.c.
However, after playing a wave file using aplay via spdif at 44.1 kHz, the
sample frequency in SPCS is changed from 48 kHz to 44.1 kHz. Also other
changes appear in some SPCS values, which I cannot trace back. Where in the
code is the SPCS value changed?

Regards,

Gerard Janssen


********************************************************************** 
Dr.ir. Gerard J.M. Janssen
Delft University of Technology 
Faculty of Information Technology and Systems (ITS) 
Telecommunications and Traffic Control Systems Group
P.O. Box 5031, 2600 GA Delft, The Netherlands 
Phone +31-15-2786736, Fax +31-15-2781774 
E-mail G.Janssen@ITS.TUDelft.NL 
**********************************************************************




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Re: Re: [Alsa-user] How to select different S/PDIFoutput ports on a SBLive!

[Takashi Iwai]

Hi,

(I removed alsa-users from Cc)

At Fri, 20 Sep 2002 10:56:01 +0200,
Gerard Janssen wrote:
> 
> I tried to find the spdif output port addresses by changing the register
> addresses of EXTOUT_TOSLINK_L/R in emu10k1.h to all 16 possible output
> address pairs between (00 - 1f). To do this, I removed the extout_mask
> check in emufx.c in the piece of code given below. I found the addresses of
> the four spdif output ports of the SBLive! card (I did/could not check this
> for the Audigity) and they are as follows: spdifo#0 = (0x02,0x03), which is
> the standard output, spdifo#1 = (0x04,0x05), spdifo#2 = (0x06,0x07) and
> spdifo#3 = (0x08,0x09).
> 
> So in principle it seems to be possible to create 8 digital output channels
> on the SBLive!, however at the cost of some of its standard
> functionalities, namely the outputs of the center_lfe, headphone and rear
> channels to the LiveDrive (I think?). 

it's interesting.
are signals sent to all spdif outs without changing any other reigisters?

> 
> Now, I would like to implement three additional spdif outputs in the same
> way as the standard output, so without volume or tone control. I think,
> this is an interesting extension of the functionality of the SBLive, since
> by creating 8 independent digital outputs we get a functionality on a cheap
> soundcard which is now only available at expensive (professional) soundcards.
> The problem is that I am not a programmer, however, I would like to give it
> a try where any help from the ALSA community is very much appreciated. I
> have the following questions:
> 
> 1. Is the code related to the standard spdif output in emufx.c, limited to
> the following code lines or is there other code involved?
> 	if (emu->fx8010.extout_mask &
> ((1<<EXTOUT_TOSLINK_L)|(1<<EXTOUT_TOSLINK_R))) {
> 		/* IEC958 Optical Raw Playback Switch */
> 
> 		for (z = 0; z < 2; z++) {
> 			SWITCH(icode, &ptr, tmp + 0, 8 + z, gpr + z);
> 			SWITCH_NEG(icode, &ptr, tmp + 1, gpr + z);
> 			SWITCH(icode, &ptr, tmp + 1, playback + SND_EMU10K1_PLAYBACK_CHANNELS +
> z, tmp + 1);
> 			OP(icode, &ptr, iACC3, EXTOUT(EXTOUT_TOSLINK_L + z), GPR(tmp + 0),
> GPR(tmp + 1), C_00000000);
> 		}
> 		snd_emu10k1_init_stereo_onoff_control(controls + i++, "IEC958 Optical Raw
> Playback Switch", gpr, 0);
> 		gpr += 2;
> 	}

the code above implements a switch for "raw" playback (e.g. ac3).
at the first step, you can skip this switch and route wet signals like
others.

> 
> 2. To what address does "tmp" refer in the OP instruction above?

initialized at the beginning of the function.  it's 0x88.
as imagined from its name, it's a temporary GPR.

> 3. Do I need to implement additional "Process FX Buses" (now there are 9
> buses, indicated as GPR(0) - GPR(9), where GPR(8) and GPR(9) have the
> comment S/PDIF left/right)?

we might need more two FX buses for all 4 separate outputs (see below
my comments).
GPR(8) and (9) are used for raw playback, so additionally we need more
if 4 raw playbacks are needed, too.

> 4. I thought that the spdif channel status registers SPCS0-3 (I added an
> SPCS3 on address 0x57 in emu10k1.h) were initialized in emu10k1_main.c.
> However, after playing a wave file using aplay via spdif at 44.1 kHz, the
> sample frequency in SPCS is changed from 48 kHz to 44.1 kHz. Also other
> changes appear in some SPCS values, which I cannot trace back. Where in the
> code is the SPCS value changed?

SPCS is changed in snd_emu10k1_spdif_put() (in emumixer.c).
the value is changed if you open the pcm with arguments like
AES0=xxx.


the necessary changes would be to add controls to change other SPCS
registers via mixer (and more "raw playback" switches if necessary).

basically, the routing can be controlled via a mixer control element.
that is, to which FX bus and how much the signal is sent.
on the current code, you cannot separate spdif #1 and #2, since both
use the same center/lfe source.  thus, we can define new FX channels
for them and mix if neceessary.

even with the current code, you can change the routing like the
following:

SPDIF #0
	normal spdif playback
	% aplay -Dspdif ...

SPDIF #1
	(adjust Wave Center Playback Volume
	        Wave LFE Playback Volume)
	% aplay -Dcenter_lfe ...

SPDIF #2
	(toggle Headphone Center Playback Switch,1
	    and Headphone LFE Playback Switch,1
	 adjust Headphone Playback Volume,1
	 in addition to the volumes for spdif#2)
	% aplay -Dcenter_lfe ...

SPDIF #3
	(adjust Wave Surround Playback Volume)
	% aplay -Drear ...


Takashi


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Re: Re: [Alsa-user] How to select different S/PDIFoutput ports on a SBLive!

[Jaroslav Kysela]

On Tue, 24 Sep 2002, Takashi Iwai wrote:

> Hi,
> 
> (I removed alsa-users from Cc)
> 
> At Fri, 20 Sep 2002 10:56:01 +0200,
> Gerard Janssen wrote:
> > 
> > I tried to find the spdif output port addresses by changing the register
> > addresses of EXTOUT_TOSLINK_L/R in emu10k1.h to all 16 possible output
> > address pairs between (00 - 1f). To do this, I removed the extout_mask
> > check in emufx.c in the piece of code given below. I found the addresses of
> > the four spdif output ports of the SBLive! card (I did/could not check this
> > for the Audigity) and they are as follows: spdifo#0 = (0x02,0x03), which is
> > the standard output, spdifo#1 = (0x04,0x05), spdifo#2 = (0x06,0x07) and
> > spdifo#3 = (0x08,0x09).
> > 
> > So in principle it seems to be possible to create 8 digital output channels
> > on the SBLive!, however at the cost of some of its standard
> > functionalities, namely the outputs of the center_lfe, headphone and rear
> > channels to the LiveDrive (I think?). 
> 
> it's interesting.
> are signals sent to all spdif outs without changing any other reigisters?
> 
> > 
> > Now, I would like to implement three additional spdif outputs in the same
> > way as the standard output, so without volume or tone control. I think,
> > this is an interesting extension of the functionality of the SBLive, since
> > by creating 8 independent digital outputs we get a functionality on a cheap
> > soundcard which is now only available at expensive (professional) soundcards.
> > The problem is that I am not a programmer, however, I would like to give it
> > a try where any help from the ALSA community is very much appreciated. I
> > have the following questions:
> > 
> > 1. Is the code related to the standard spdif output in emufx.c, limited to
> > the following code lines or is there other code involved?
> > 	if (emu->fx8010.extout_mask &
> > ((1<<EXTOUT_TOSLINK_L)|(1<<EXTOUT_TOSLINK_R))) {
> > 		/* IEC958 Optical Raw Playback Switch */
> > 
> > 		for (z = 0; z < 2; z++) {
> > 			SWITCH(icode, &ptr, tmp + 0, 8 + z, gpr + z);
> > 			SWITCH_NEG(icode, &ptr, tmp + 1, gpr + z);
> > 			SWITCH(icode, &ptr, tmp + 1, playback + SND_EMU10K1_PLAYBACK_CHANNELS +
> > z, tmp + 1);
> > 			OP(icode, &ptr, iACC3, EXTOUT(EXTOUT_TOSLINK_L + z), GPR(tmp + 0),
> > GPR(tmp + 1), C_00000000);
> > 		}
> > 		snd_emu10k1_init_stereo_onoff_control(controls + i++, "IEC958 Optical Raw
> > Playback Switch", gpr, 0);
> > 		gpr += 2;
> > 	}
> 
> the code above implements a switch for "raw" playback (e.g. ac3).
> at the first step, you can skip this switch and route wet signals like
> others.
> 
> > 
> > 2. To what address does "tmp" refer in the OP instruction above?
> 
> initialized at the beginning of the function.  it's 0x88.
> as imagined from its name, it's a temporary GPR.
> 
> > 3. Do I need to implement additional "Process FX Buses" (now there are 9
> > buses, indicated as GPR(0) - GPR(9), where GPR(8) and GPR(9) have the
> > comment S/PDIF left/right)?
> 
> we might need more two FX buses for all 4 separate outputs (see below
> my comments).
> GPR(8) and (9) are used for raw playback, so additionally we need more
> if 4 raw playbacks are needed, too.
> 
> > 4. I thought that the spdif channel status registers SPCS0-3 (I added an
> > SPCS3 on address 0x57 in emu10k1.h) were initialized in emu10k1_main.c.
> > However, after playing a wave file using aplay via spdif at 44.1 kHz, the
> > sample frequency in SPCS is changed from 48 kHz to 44.1 kHz. Also other
> > changes appear in some SPCS values, which I cannot trace back. Where in the
> > code is the SPCS value changed?
> 
> SPCS is changed in snd_emu10k1_spdif_put() (in emumixer.c).
> the value is changed if you open the pcm with arguments like
> AES0=xxx.
> 
> 
> the necessary changes would be to add controls to change other SPCS
> registers via mixer (and more "raw playback" switches if necessary).
> 
> basically, the routing can be controlled via a mixer control element.
> that is, to which FX bus and how much the signal is sent.
> on the current code, you cannot separate spdif #1 and #2, since both
> use the same center/lfe source.  thus, we can define new FX channels
> for them and mix if neceessary.

We're very tight with GPRs with the current firmware. Implementing next 
features will require the firmware linker / manager in the user space.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project  http://www.alsa-project.org
SuSE Linux    http://www.suse.com



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Re: How to select different S/PDIFoutput ports on a SBLive!

[Gerard Janssen]

Hi,

Takashi wrote

>Gerard Janssen wrote:
>> 
>> I tried to find the spdif output port addresses by changing the register
>> addresses of EXTOUT_TOSLINK_L/R in emu10k1.h to all 16 possible output
>> address pairs between (00 - 1f). To do this, I removed the extout_mask
>> check in emufx.c in the piece of code given below. I found the addresses of
>> the four spdif output ports of the SBLive! card (I did/could not check this
>> for the Audigity) and they are as follows: spdifo#0 = (0x02,0x03), which is
>> the standard output, spdifo#1 = (0x04,0x05), spdifo#2 = (0x06,0x07) and
>> spdifo#3 = (0x08,0x09).
>> 
>> So in principle it seems to be possible to create 8 digital output channels
>> on the SBLive!, however at the cost of some of its standard
>> functionalities, namely the outputs of the center_lfe, headphone and rear
>> channels to the LiveDrive (I think?). 
>
>it's interesting.
>are signals sent to all spdif outs without changing any other reigisters?

In this experiment, I just changed the address of EXTOUT_TOSLINK_L/R in
emu10k1.h. When using <aplay -D spdif "test.wav"> the signal is routed to
the respective SPDIF output ports coreesponding to the chosen
EXTOUT_TOSLINK_L/R adresses as mentioned above. 

>> 
>> Now, I would like to implement three additional spdif outputs in the same
>> way as the standard output, so without volume or tone control. I think,
>> this is an interesting extension of the functionality of the SBLive, since
>> by creating 8 independent digital outputs we get a functionality on a cheap
>> soundcard which is now only available at expensive (professional)
soundcards.
>> The problem is that I am not a programmer, however, I would like to give it
>> a try where any help from the ALSA community is very much appreciated. I
>> have the following questions:
>> 
>> 1. Is the code related to the standard spdif output in emufx.c, limited to
>> the following code lines or is there other code involved?
>> 	if (emu->fx8010.extout_mask &
>> ((1<<EXTOUT_TOSLINK_L)|(1<<EXTOUT_TOSLINK_R))) {
>> 		/* IEC958 Optical Raw Playback Switch */
>> 
>> 		for (z = 0; z < 2; z++) {
>> 			SWITCH(icode, &ptr, tmp + 0, 8 + z, gpr + z);
>> 			SWITCH_NEG(icode, &ptr, tmp + 1, gpr + z);
>> 			SWITCH(icode, &ptr, tmp + 1, playback + SND_EMU10K1_PLAYBACK_CHANNELS +
>> z, tmp + 1);
>> 			OP(icode, &ptr, iACC3, EXTOUT(EXTOUT_TOSLINK_L + z), GPR(tmp + 0),
>> GPR(tmp + 1), C_00000000);
>> 		}
>> 		snd_emu10k1_init_stereo_onoff_control(controls + i++, "IEC958 Optical Raw
>> Playback Switch", gpr, 0);
>> 		gpr += 2;
>> 	}
>
>the code above implements a switch for "raw" playback (e.g. ac3).
>at the first step, you can skip this switch and route wet signals like
>others.

OK, in a following experiment I will try to route the "Process FX Buses"
directly to the SPDIF outputs using:
OP(icode, &ptr, iACC3, EXTOUT(EXTOUT_X_L + z), GPR(FX_Bus_Y +z),
C_00000000, C_00000000);
and neglect the current routings.

>> 
>> 3. Do I need to implement additional "Process FX Buses" (now there are 9
>> buses, indicated as GPR(0) - GPR(9), where GPR(8) and GPR(9) have the
>> comment S/PDIF left/right)?
>
>we might need more two FX buses for all 4 separate outputs (see below
>my comments).
>GPR(8) and (9) are used for raw playback, so additionally we need more
>if 4 raw playbacks are needed, too.
>
>the necessary changes would be to add controls to change other SPCS
>registers via mixer (and more "raw playback" switches if necessary).
>
>basically, the routing can be controlled via a mixer control element.
>that is, to which FX bus and how much the signal is sent.
>on the current code, you cannot separate spdif #1 and #2, since both
>use the same center/lfe source.  thus, we can define new FX channels
>for them and mix if neceessary.

I added SPCS3 on address 0x57, and increased the spdif_bits array form 3 to
4 locations in emu10k1.h. Further, SPCS3 was initialized in emu10k1_main.c.
Is this sufficient to make it active and remove the sharing of SPCS2 for
SPDIF2&3? 

>even with the current code, you can change the routing like the
>following:
>
>SPDIF #0
>	normal spdif playback
>	% aplay -Dspdif ...
>
>SPDIF #1
>	(adjust Wave Center Playback Volume
>	        Wave LFE Playback Volume)
>	% aplay -Dcenter_lfe ...
>
>SPDIF #2
>	(toggle Headphone Center Playback Switch,1
>	    and Headphone LFE Playback Switch,1
>	adjust Headphone Playback Volume,1
>	in addition to the volumes for spdif#2)
>	% aplay -Dcenter_lfe ...
>
>SPDIF #3
>	(adjust Wave Surround Playback Volume)
>	% aplay -Drear ...
>
Ok, my preference is to have a direct rout towards the SPDIF outputs
without amplitude or tone control. A switch to choose between either the
original application with the LiveDrive and its routings/controls or four
SPDIF outputs with or without further controls could be a solution.

Thanks,

Gerard





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Re: How to select different S/PDIFoutput ports on a SBLive!

[Gerard Janssen]

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