[gentoo-user] "X11 forwarding" so to say ... but for audio

[gentoo-user] "X11 forwarding" so to say ... but for audio

[Meino.Cramer]

Hi,

I am experimenting with microcrontrollers, dev-boards
and other stuff a lot.
Nowaday these "post stamps" are quite capable and often
run linux of some kind.

The beaglebone and the Orange PI PC are of those, even
running an X11 server.

X11 forwarding is quite handy in this cases...but I miss the
audio.

I am already tangled up in cables ... and dont want to add
just another cable to route the audio signal to my PC.

Is there any other way to get the audio from the (in this case)
Orange PI PC board to my PC in a way, that dont need cables
and is easily reconfigurable, if I will change the board
to something different?

Thanks a lot in advance for any help!

Best regards
Meino

PS: @James: Do you know the NodeMCU Lua v3 board? ;)

Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Fernando Rodriguez]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 07/18/2016 01:16 AM, Meino.Cramer@gmx.de wrote:
> Hi,
> 
> I am experimenting with microcrontrollers, dev-boards
> and other stuff a lot.
> Nowaday these "post stamps" are quite capable and often
> run linux of some kind.
> 
> The beaglebone and the Orange PI PC are of those, even
> running an X11 server.
> 
> X11 forwarding is quite handy in this cases...but I miss the
> audio.
> 
> I am already tangled up in cables ... and dont want to add
> just another cable to route the audio signal to my PC.
> 
> Is there any other way to get the audio from the (in this case)
> Orange PI PC board to my PC in a way, that dont need cables
> and is easily reconfigurable, if I will change the board
> to something different?
> 
> Thanks a lot in advance for any help!
> 
> Best regards
> Meino
> 
> PS: @James: Do you know the NodeMCU Lua v3 board? ;)

PulseAudio.

https://askubuntu.com/questions/371687/how-to-carry-audio-over-ssh


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Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Meino.Cramer]

Fernando Rodriguez <cyklonite@gmail.com> [16-07-18 07:32]:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
> 
> On 07/18/2016 01:16 AM, Meino.Cramer@gmx.de wrote:
> > Hi,
> > 
> > I am experimenting with microcrontrollers, dev-boards
> > and other stuff a lot.
> > Nowaday these "post stamps" are quite capable and often
> > run linux of some kind.
> > 
> > The beaglebone and the Orange PI PC are of those, even
> > running an X11 server.
> > 
> > X11 forwarding is quite handy in this cases...but I miss the
> > audio.
> > 
> > I am already tangled up in cables ... and dont want to add
> > just another cable to route the audio signal to my PC.
> > 
> > Is there any other way to get the audio from the (in this case)
> > Orange PI PC board to my PC in a way, that dont need cables
> > and is easily reconfigurable, if I will change the board
> > to something different?
> > 
> > Thanks a lot in advance for any help!
> > 
> > Best regards
> > Meino
> > 
> > PS: @James: Do you know the NodeMCU Lua v3 board? ;)
> 
> PulseAudio.
> 
> https://askubuntu.com/questions/371687/how-to-carry-audio-over-ssh
> 
> 
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Hi Fernando,

thanks for the link! Will check that...

Best 
Meino

Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Erik Marsk]

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Jack is another option:
https://github.com/jackaudio/jackaudio.github.com/wiki/WalkThrough_User_NetJack
https://github.com/jackaudio/jackaudio.github.com/wiki/WalkThrough_User_NetJack2

-- Emanuele Rusconi

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Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Stroller]

> On 18 Jul 2016, at 06:16, meino.cramer@gmx.de wrote:
> 
> X11 forwarding is quite handy in this cases...but I miss the
> audio.

It might be worth looking at xpra if you want both together.

I would choose the 0.17.x release - Portage is bang up to date with the latest version.

http://xpra.org/trac/wiki/Versions

Any problems, use the xpra mailing list and you'll find the developer very helpful and responsive.

http://lists.devloop.org.uk/mailman/listinfo/shifter-users

Stroller.

Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Meino.Cramer]

Stroller <stroller@stellar.eclipse.co.uk> [16-07-19 04:44]:
> 
> > On 18 Jul 2016, at 06:16, meino.cramer@gmx.de wrote:
> > 
> > X11 forwarding is quite handy in this cases...but I miss the
> > audio.
> 
> It might be worth looking at xpra if you want both together.
> 
> I would choose the 0.17.x release - Portage is bang up to date with the latest version.
> 
> http://xpra.org/trac/wiki/Versions
> 
> Any problems, use the xpra mailing list and you'll find the developer very helpful and responsive.
> 
> http://lists.devloop.org.uk/mailman/listinfo/shifter-users
> 
> Stroller.

Hi Stroller,

thanks for pointing me to this one! :)

But... 

I got some messages from the build process, I dont understand...

The XPRA-Wiki say for the building process:
    Gentoo
    The xpra ebuilds in portage are reasonably up to date, just avoid the outdated versions shipped as "stable"


So I did this:
    vemerge x11-wm/xpra-0.17.4
as root ("vemerge" is a little script I wrote which simply put the =
before and 's around the package name.)

This gives me:
Calculating dependencies |

!!! Problem resolving dependencies for =x11-wm/xpra-0.17.4                                                ... done!

!!! The ebuild selected to satisfy "=x11-wm/xpra-0.17.4" has unmet requirements.
- x11-wm/xpra-0.17.4::gentoo USE="client clipboard lzo opengl x264 x265 -csc -cups -dec_av2 -libav -lz4 -pulseaudio -server -sound -vpx -webp" ABI_X86="64" PYTHON_TARGETS="python2_7"

  The following REQUIRED_USE flag constraints are unsatisfied:
    client? ( x264? ( dec_av2 ) x265? ( dec_av2 ) )

  The above constraints are a subset of the following complete expression:
    any-of ( python_targets_python2_7 ) clipboard? ( any-of ( server client ) ) opengl? ( client ) any-of ( client server ) client? ( x264? ( dec_av2 ) x265? ( dec_av2 ) ) any-of ( python_targets_python2_7 )



Not really sure what that means I added the following line

x11-wm/xpra x264

to package.use/.

and received the same message again.

Any advice how to get this compiled is very appreciated! ;)

Thanks a lot in advance for any help!
Best regards,
Meino

Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Neil Bothwick]

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On Tue, 19 Jul 2016 07:08:24 +0200, Meino.Cramer@gmx.de wrote:

> !!! The ebuild selected to satisfy "=x11-wm/xpra-0.17.4" has unmet
> requirements.
> - x11-wm/xpra-0.17.4::gentoo USE="client clipboard lzo opengl x264 x265
> -csc -cups -dec_av2 -libav -lz4 -pulseaudio -server -sound -vpx -webp"
> ABI_X86="64" PYTHON_TARGETS="python2_7"
> 
>   The following REQUIRED_USE flag constraints are unsatisfied:
>     client? ( x264? ( dec_av2 ) x265? ( dec_av2 ) )

It means that if you have client you need x264 and x265 and those both
require dec_av2, which is the one you don't have set.


-- 
Neil Bothwick

Smoking Can Damage Your Health....Unless us Non-Smokers do it first!

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Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Fernando Rodriguez]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 07/19/2016 03:49 AM, Neil Bothwick wrote:
> On Tue, 19 Jul 2016 07:08:24 +0200, Meino.Cramer@gmx.de wrote:
> 
>> !!! The ebuild selected to satisfy "=x11-wm/xpra-0.17.4" has unmet
>> requirements.
>> - x11-wm/xpra-0.17.4::gentoo USE="client clipboard lzo opengl x264 x265
>> -csc -cups -dec_av2 -libav -lz4 -pulseaudio -server -sound -vpx -webp"
>> ABI_X86="64" PYTHON_TARGETS="python2_7"
>>
>>   The following REQUIRED_USE flag constraints are unsatisfied:
>>     client? ( x264? ( dec_av2 ) x265? ( dec_av2 ) )
> 
> It means that if you have client you need x264 and x265 and those both
> require dec_av2, which is the one you don't have set.
> 
> 

I thought it meant that if you have client AND (x264 OR x265) then you
need dec_av2. client doesn't require x264 or x265 by itself.
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Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Neil Bothwick]

[-- Attachment #1: Type: text/plain, Size: 705 bytes --]

On Tue, 19 Jul 2016 07:21:33 -0400, Fernando Rodriguez wrote:

> >>   The following REQUIRED_USE flag constraints are unsatisfied:
> >>     client? ( x264? ( dec_av2 ) x265? ( dec_av2 ) )  
> > 
> > It means that if you have client you need x264 and x265 and those both
> > require dec_av2, which is the one you don't have set.
> > 
> >   
> 
> I thought it meant that if you have client AND (x264 OR x265) then you
> need dec_av2. client doesn't require x264 or x265 by itself.

Doesn't that use || ? Anyway, he has client and x264, so dec_av2 is
needed.


-- 
Neil Bothwick

Never argue with an idiot. First, they bring you down to their level.
Then they beat you with experience.

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Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Fernando Rodriguez]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 07/19/2016 08:17 AM, Neil Bothwick wrote:
> On Tue, 19 Jul 2016 07:21:33 -0400, Fernando Rodriguez wrote:
> 
>>>>   The following REQUIRED_USE flag constraints are unsatisfied:
>>>>     client? ( x264? ( dec_av2 ) x265? ( dec_av2 ) )  
>>>
>>> It means that if you have client you need x264 and x265 and those both
>>> require dec_av2, which is the one you don't have set.
>>>
>>>   
>>
>> I thought it meant that if you have client AND (x264 OR x265) then you
>> need dec_av2. client doesn't require x264 or x265 by itself.
> 
> Doesn't that use || ? Anyway, he has client and x264, so dec_av2 is
> needed.
> 

No, || means "any of", see [1]. And I believe in that case portage will translate
it to "any-of" or something like that. These are just nested conditionals. It can
be confusing even for someone with programming background. I suppose portage
could translate that into a more human friendly form but with many nesting levels
it will get ugly any way you put it.

And yes, dec_av2 is what he needs (unless he doesn't need x264 and x265 support).
I was just clearing the point about the meaning of the message.

[1] https://devmanual.gentoo.org/general-concepts/dependencies/

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Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Meino.Cramer]

Fernando Rodriguez <cyklonite@gmail.com> [16-07-19 16:24]:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
> 
> On 07/19/2016 08:17 AM, Neil Bothwick wrote:
> > On Tue, 19 Jul 2016 07:21:33 -0400, Fernando Rodriguez wrote:
> > 
> >>>>   The following REQUIRED_USE flag constraints are unsatisfied:
> >>>>     client? ( x264? ( dec_av2 ) x265? ( dec_av2 ) )  
> >>>
> >>> It means that if you have client you need x264 and x265 and those both
> >>> require dec_av2, which is the one you don't have set.
> >>>
> >>>   
> >>
> >> I thought it meant that if you have client AND (x264 OR x265) then you
> >> need dec_av2. client doesn't require x264 or x265 by itself.
> > 
> > Doesn't that use || ? Anyway, he has client and x264, so dec_av2 is
> > needed.
> > 
> 
> No, || means "any of", see [1]. And I believe in that case portage will translate
> it to "any-of" or something like that. These are just nested conditionals. It can
> be confusing even for someone with programming background. I suppose portage
> could translate that into a more human friendly form but with many nesting levels
> it will get ugly any way you put it.
> 
> And yes, dec_av2 is what he needs (unless he doesn't need x264 and x265 support).
> I was just clearing the point about the meaning of the message.
> 
> [1] https://devmanual.gentoo.org/general-concepts/dependencies/
> 
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> 

Hi all-taht-are-helping-me :)

...I am currently facing more fundamental problems. Background:
I run an Orange PI PC (Allwinner H3 quadcore, 1.2GHz), which has
an HDMI connector, but this would mean an additional cable. Since
the Orange PI PC cannot be powered via USB, currently there
is a power cable and an ethernet cable around here (next is to 
replace the ethernet cable by a wlan connection, but first I need
some sound...)

The traditional ssh -X user@host and then starting a X-applications
runs quite well and even monsters like open office are quite
useable...until those applications with sound.

I tried xpra and (with your help! THX! :) it is spitting warnings
and is to slow even when using application, which do not create
sound.

I dont want pulseaudio. I tried that several times on my dekstop
Linux PC and it screws up things for reasons unknown to me. I will
not exclude the person in front of my monitor as one of the sources
of those problems...but why to give it another chance.

Jack-net isnt available fon Armbian as server application (Armbian
is running on the Orange PI PC).

I dont like HDMI since it is a monitor thingy and does not integrate
into the desktop well, since it is a physical switch. 

Any other chance to get X11 talking to me without any addtional cable?

Best regards,
Meino

Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Fernando Rodriguez]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 07/19/2016 10:37 AM, Meino.Cramer@gmx.de wrote:
> Fernando Rodriguez <cyklonite@gmail.com> [16-07-19 16:24]:
> On 07/19/2016 08:17 AM, Neil Bothwick wrote:
>>>> On Tue, 19 Jul 2016 07:21:33 -0400, Fernando Rodriguez wrote:
>>>>
>>>>>>>   The following REQUIRED_USE flag constraints are unsatisfied:
>>>>>>>     client? ( x264? ( dec_av2 ) x265? ( dec_av2 ) )  
>>>>>>
>>>>>> It means that if you have client you need x264 and x265 and those both
>>>>>> require dec_av2, which is the one you don't have set.
>>>>>>
>>>>>>   
>>>>>
>>>>> I thought it meant that if you have client AND (x264 OR x265) then you
>>>>> need dec_av2. client doesn't require x264 or x265 by itself.
>>>>
>>>> Doesn't that use || ? Anyway, he has client and x264, so dec_av2 is
>>>> needed.
>>>>
> 
> No, || means "any of", see [1]. And I believe in that case portage will translate
> it to "any-of" or something like that. These are just nested conditionals. It can
> be confusing even for someone with programming background. I suppose portage
> could translate that into a more human friendly form but with many nesting levels
> it will get ugly any way you put it.
> 
> And yes, dec_av2 is what he needs (unless he doesn't need x264 and x265 support).
> I was just clearing the point about the meaning of the message.
> 
> [1] https://devmanual.gentoo.org/general-concepts/dependencies/
> 
>>
> 
> Hi all-taht-are-helping-me :)
> 
> ...I am currently facing more fundamental problems. Background:
> I run an Orange PI PC (Allwinner H3 quadcore, 1.2GHz), which has
> an HDMI connector, but this would mean an additional cable. Since
> the Orange PI PC cannot be powered via USB, currently there
> is a power cable and an ethernet cable around here (next is to 
> replace the ethernet cable by a wlan connection, but first I need
> some sound...)
> 
> The traditional ssh -X user@host and then starting a X-applications
> runs quite well and even monsters like open office are quite
> useable...until those applications with sound.
> 
> I tried xpra and (with your help! THX! :) it is spitting warnings
> and is to slow even when using application, which do not create
> sound.
> 
> I dont want pulseaudio. I tried that several times on my dekstop
> Linux PC and it screws up things for reasons unknown to me. I will
> not exclude the person in front of my monitor as one of the sources
> of those problems...but why to give it another chance.

You're not alone. Sadly as you're finding out, that is the state of such
applications. PulseAudio being the most widely used will probably
be the easiest to setup and find answers when you run into trouble.

On my laptops I disabled the pulseaudio use flag so none of my applications
is using it (except Bluez) but I keep it installed and running for bluetooth
audio. That way it cannot screw things up (except bluetooth audio but that 
doesn't work without it anyways). Yours would be a similar use case.

> Jack-net isnt available fon Armbian as server application (Armbian
> is running on the Orange PI PC).
> 
> I dont like HDMI since it is a monitor thingy and does not integrate
> into the desktop well, since it is a physical switch. 
> 
> Any other chance to get X11 talking to me without any addtional cable?
> 
> Best regards,
> Meino
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 

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Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Meino.Cramer]

Fernando Rodriguez <cyklonite@gmail.com> [16-07-19 17:44]:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
> 
> On 07/19/2016 10:37 AM, Meino.Cramer@gmx.de wrote:
> > Fernando Rodriguez <cyklonite@gmail.com> [16-07-19 16:24]:
> > On 07/19/2016 08:17 AM, Neil Bothwick wrote:
> >>>> On Tue, 19 Jul 2016 07:21:33 -0400, Fernando Rodriguez wrote:
> >>>>
> >>>>>>>   The following REQUIRED_USE flag constraints are unsatisfied:
> >>>>>>>     client? ( x264? ( dec_av2 ) x265? ( dec_av2 ) )  
> >>>>>>
> >>>>>> It means that if you have client you need x264 and x265 and those both
> >>>>>> require dec_av2, which is the one you don't have set.
> >>>>>>
> >>>>>>   
> >>>>>
> >>>>> I thought it meant that if you have client AND (x264 OR x265) then you
> >>>>> need dec_av2. client doesn't require x264 or x265 by itself.
> >>>>
> >>>> Doesn't that use || ? Anyway, he has client and x264, so dec_av2 is
> >>>> needed.
> >>>>
> > 
> > No, || means "any of", see [1]. And I believe in that case portage will translate
> > it to "any-of" or something like that. These are just nested conditionals. It can
> > be confusing even for someone with programming background. I suppose portage
> > could translate that into a more human friendly form but with many nesting levels
> > it will get ugly any way you put it.
> > 
> > And yes, dec_av2 is what he needs (unless he doesn't need x264 and x265 support).
> > I was just clearing the point about the meaning of the message.
> > 
> > [1] https://devmanual.gentoo.org/general-concepts/dependencies/
> > 
> >>
> > 
> > Hi all-taht-are-helping-me :)
> > 
> > ...I am currently facing more fundamental problems. Background:
> > I run an Orange PI PC (Allwinner H3 quadcore, 1.2GHz), which has
> > an HDMI connector, but this would mean an additional cable. Since
> > the Orange PI PC cannot be powered via USB, currently there
> > is a power cable and an ethernet cable around here (next is to 
> > replace the ethernet cable by a wlan connection, but first I need
> > some sound...)
> > 
> > The traditional ssh -X user@host and then starting a X-applications
> > runs quite well and even monsters like open office are quite
> > useable...until those applications with sound.
> > 
> > I tried xpra and (with your help! THX! :) it is spitting warnings
> > and is to slow even when using application, which do not create
> > sound.
> > 
> > I dont want pulseaudio. I tried that several times on my dekstop
> > Linux PC and it screws up things for reasons unknown to me. I will
> > not exclude the person in front of my monitor as one of the sources
> > of those problems...but why to give it another chance.
> 
> You're not alone. Sadly as you're finding out, that is the state of such
> applications. PulseAudio being the most widely used will probably
> be the easiest to setup and find answers when you run into trouble.
> 
> On my laptops I disabled the pulseaudio use flag so none of my applications
> is using it (except Bluez) but I keep it installed and running for bluetooth
> audio. That way it cannot screw things up (except bluetooth audio but that 
> doesn't work without it anyways). Yours would be a similar use case.
> 
> > Jack-net isnt available fon Armbian as server application (Armbian
> > is running on the Orange PI PC).
> > 
> > I dont like HDMI since it is a monitor thingy and does not integrate
> > into the desktop well, since it is a physical switch. 
> > 
> > Any other chance to get X11 talking to me without any addtional cable?
> > 
> > Best regards,
> > Meino
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> 
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> 

Hi Fernando,

thanks for your kind help! :)

ok...I will give pulseaudio another try...(sigh)

Before I start...
If my memory serves me right...is it true, that X11 starts
automagically pulseaudio , if it founds it?

And if so: How can I prevent that?

Next problem is: that armbian offers a LOT of pulseaudio
related packages...any hint what I need to install as a
minimalistic solution (this is an embedded device with
far less resources and far less hoursepower...)?

And: What do I need to install on my GENTOO PC?

Thanks a lot in advance for any help!

Best regards,
Meino

Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Marc Joliet]

[-- Attachment #1: Type: text/plain, Size: 1843 bytes --]

On Tuesday 19 July 2016 18:08:24 Meino.Cramer@gmx.de wrote:
> Fernando Rodriguez <cyklonite@gmail.com> [16-07-19 17:44]:
[...]
> 
> Hi Fernando,
> 
> thanks for your kind help! :)
> 
> ok...I will give pulseaudio another try...(sigh)
> 
> Before I start...
> If my memory serves me right...is it true, that X11 starts
> automagically pulseaudio , if it founds it?

Well, not quite.

> And if so: How can I prevent that?

Specifically, applications that request pulseaudio (via dbus, IIUC) will cause 
it to start automatically, regardless of whether they're graphical or not 
(e.g., on my home server MPD causes pulseaudio to start).  This can, however, 
be prevented by setting "autospawn=no" in .config/pulse/client.conf.

> Next problem is: that armbian offers a LOT of pulseaudio
> related packages...any hint what I need to install as a
> minimalistic solution (this is an embedded device with
> far less resources and far less hoursepower...)?

I have no experience here, sorry.

> And: What do I need to install on my GENTOO PC?

Well, at minimum media-sound/pulseaudio.  I'm not sure of anything to 
recommend here, so I'll defer to the Gentoo wiki: 
https://wiki.gentoo.org/wiki/PulseAudio.  Also see the upstream documentation: 
https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/.  In 
particular check out the module documentation, since if you go the pulseaudio 
route you'll probably be setting up a tunnel, so I would suggest searching 
there for "tunnel" (although I'm not up to speed on what's currently possible 
in PA land, so maybe there's a better way).

> Thanks a lot in advance for any help!
> 
> Best regards,
> Meino

HTH
-- 
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup

[-- Attachment #2: This is a digitally signed message part. --]
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Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Fernando Rodriguez]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 07/19/2016 12:08 PM, Meino.Cramer@gmx.de wrote:
> 
> Hi Fernando,
> 
> thanks for your kind help! :)
> 
> ok...I will give pulseaudio another try...(sigh)
> 
> Before I start...
> If my memory serves me right...is it true, that X11 starts
> automagically pulseaudio , if it founds it?

It used to be like that (through a .desktop file IIRC) but if you're
using systemd it now installs a systemd user unit, that's how I start
it. I think it still installs the .desktop files cause I deleted those
a while back and I remember getting them as a config update (etc-update)
recently.

> And if so: How can I prevent that?
> 
> Next problem is: that armbian offers a LOT of pulseaudio
> related packages...any hint what I need to install as a
> minimalistic solution (this is an embedded device with
> far less resources and far less hoursepower...)?
> 
> And: What do I need to install on my GENTOO PC?
> 
> Thanks a lot in advance for any help!
> 
> Best regards,
> Meino
> 
> 
> 
> 

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Re: [gentoo-user] "X11 forwarding" so to say ... but for audio

[Fernando Rodriguez]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 07/19/2016 12:30 PM, Marc Joliet wrote:
> On Tuesday 19 July 2016 18:08:24 Meino.Cramer@gmx.de wrote:
>> Fernando Rodriguez <cyklonite@gmail.com> [16-07-19 17:44]:
> [...]
>>
>> Hi Fernando,
>>
>> thanks for your kind help! :)
>>
>> ok...I will give pulseaudio another try...(sigh)
>>
>> Before I start...
>> If my memory serves me right...is it true, that X11 starts
>> automagically pulseaudio , if it founds it?
> 
> Well, not quite.
> 
>> And if so: How can I prevent that?
> 
> Specifically, applications that request pulseaudio (via dbus, IIUC) will cause 
> it to start automatically, regardless of whether they're graphical or not 
> (e.g., on my home server MPD causes pulseaudio to start).  This can, however, 
> be prevented by setting "autospawn=no" in .config/pulse/client.conf.

That too. I don't know if x11 forwarding uses dbus activation though and with
a minimal setup he won't have any programs to start it.

>> Next problem is: that armbian offers a LOT of pulseaudio
>> related packages...any hint what I need to install as a
>> minimalistic solution (this is an embedded device with
>> far less resources and far less hoursepower...)?
> 
> I have no experience here, sorry.
> 
>> And: What do I need to install on my GENTOO PC?
> 
> Well, at minimum media-sound/pulseaudio.  I'm not sure of anything to 
> recommend here, so I'll defer to the Gentoo wiki: 
> https://wiki.gentoo.org/wiki/PulseAudio.  Also see the upstream documentation: 
> https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/.  In 
> particular check out the module documentation, since if you go the pulseaudio 
> route you'll probably be setting up a tunnel, so I would suggest searching 
> there for "tunnel" (although I'm not up to speed on what's currently possible 
> in PA land, so maybe there's a better way).
> 

I think you just need the pulseaudio with the X and alsa use flags (and any other
flags you need to get it to emerge). I don't know exactly cause I just noticed that
I have a lot more stuff enabled than I need. You definitely don't want alsa-plugin or
your ALSA programs will use pulseaudio.

>> Thanks a lot in advance for any help!
>>
>> Best regards,
>> Meino
> 
> HTH
> 

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[gentoo-user] Re: "X11 forwarding" so to say ... but for audio

[James]

 <Meino.Cramer <at> gmx.de> writes:
 
> Hi,
<edit>
> PS:  <at> James: Do you know the NodeMCU Lua v3 board? ;)

Ju talkin to me?  Ju talkin to me?   
If so, sorry, had a major hardware issues where I lost a few days....

No not specifically, but that does not matter, embedded is embedded
and it's always broken, until you find the magic (hardware) tweaks
and codes that make it submissive, so let's take a walk thru your issues.

PS, I'm close on my install apparatus so when that is done I intend to
populate my micro Data Center with all sorts of new hardware boards
(get an embedded list ready).


> I am experimenting with microcrontrollers, dev-boards
> and other stuff a lot.
> Nowaday these "post stamps" are quite capable and often
> run linux of some kind.
> The beaglebone and the Orange PI PC are of those, even
> running an X11 server.
> X11 forwarding is quite handy in this cases...but I miss the
> audio.

Why not try to get (gentoo) linux running a arm64v8 board, with  gigs
of ram and gigE and such so you can run a low power workstation from a
board taped (mounted) to the back of the monitor? There are many
and once you get gentoo installed, then choose a minimal DE like
lxde, xfce or lxqt? Audio and video on the same board. Here's
one example (not sure there is a published gentoo port, yet), 
for less than $50::

http://www.cnx-software.com/2016/02/29/odroid-c2-64-bit-arm-development-board-is-now-available-for-purchase-for-40/

This is just an example. I'm not current atm on the latest offerings.
Most run debian, which is fine for now until you finish a gentoo port,
or find one on the IRC channel   gentoo-embedded@gentoo.org

> I am already tangled up in cables ... and dont want to add
> just another cable to route the audio signal to my PC.

Make sure you keep straight your 'line level' signals and the 
boosted output signals, I test with a 3" speaker or small to make
sure a valid audio signal is first exiting an embedded board jack.
If you want a routeable audio protocol (?) You could always use midi::

http://www.instructables.com/id/Send-and-Receive-MIDI-with-Arduino/

Hit me up with private email, if you get stuck, but, I'm kinda swamped
right now.....


Some embedded boards have an RF chip for radio broadcast, that is low power,
so you could just broadcast to a receive and a pair of connected/powered
speakers, just for grins. (I have no boards doing this currently, as I have
way too much audio gear that is idle atm.) But that sort of arrangement will
need an externally powered audio amp to get the dB levels up. I know 
one guy that just broadcasts to his home theatre  hardware for SS-7
audio on an embedded board and just lies to his friends about how
he does it....(I traced out the wire and looked at the board to figure
it out.....  Datasheets are your friend. Motorola/Freescale/<whatever they
call themselves> has a plethora of arm cores and robust audio chips,
including a full spectrum analyzer so you can specify what will end
up with before you build something.....


> Is there any other way to get the audio from the (in this case)
> Orange PI PC board to my PC in a way, that dont need cables
> and is easily reconfigurable, if I will change the board
> to something different?

Meino. Your best bet is do write up a spec of what you want, go to
the gentoo-embedded IRC channel (yuck, I hate IRC, as you know) and
ask for a turnkey (monkey see monkey do) low cost recommendation.
Or go to one of the debian embedded lists and ask for a cheap solution.
Also, research the Rf spectrum rules in the country you are in 
before selecting Rf broadcast chips on a dev board, just to be legal.
Germany is rather 'tight assed' about this, if I recall correctly.
Here in the US, some TV sidebands are available for experimentation
as broadcasters abandon those freqs.

http://blog.rfvenue.com/more-on-the-fccs-proposed-new-rules-for-licensed-and-unlicensed-microphones/

http://www.digitaltrends.com/how-to/how-to-stream-audio-video-in-your-home/

Or you buy an embedded board that has an HDMI output and a stereo
output jack, you would have what you need. Some 32 bit arm boards will
have both of these and a minimized X11 Desktop environment will fly
on them, minus 3D stuff. Look at the video chip and research that it has a
bit of video ram with it, just to be safe. There are lots of new embedded
boards coming out every week, so do the latest research and make sure
at least debian is readily available from the hardware vendor. There is
some 'bait and switch' going on among the smaller players.

http://www.96boards.org/products/


rspi3::
https://www.amazon.com/Raspberry-Pi-RASP-PI-3-Model-Motherboard/dp/B01CD5VC92

** do your own research**

> Thanks a lot in advance for any help!
> Best regards
> Meino


hth,
James