Equalizer, alsaequal

[Gerrelt]

Hi all, Béla, 

Somebody asked me a question about running an equalizer with squeezelite. This person used "Alsaequal".
I've looked into it, and it works quite nice.

See:
http://www.thedigitalmachine.net/alsaequal.html

and:

http://www.raspberrypi.org/forums/viewtopic.php?f=28&t=72008&p=519643&hilit=equalizer#p519643

I've searched the repo, but it isn't available on piCore. Would it be possible to get it running on piCore? 

Greetings,
    Gerrelt.

[bmarkus]

Hi

I will add it.

Béla

[Gerrelt]

Great, thanx! 

[bmarkus]

Added to repo. Just built, not tested. Let me know is it OK or not, need changes, etc.

[Misalf]

Sounds useful. Mind provide it for x86, too?

[bmarkus]

Sounds useful. Mind provide it for x86, too?

Done, added to repo

[Gerrelt]

Hi Béla,

 Thank you for your fast response.

I've tested it, but it does not seem to work. This is how I tried it:

First I installed it with tce:

Code: [Select]

tce-load -wi alsaequal.tcz
then I made a asound.conf file:

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sudo nano -c /etc/asound.conf
with this content:

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ctl.equal {
   type equal;
}

pcm.plugequal {
    type equal;
    slave.pcm "plughw:0,0";
}

pcm.!default{
         type plug;
         slave.pcm plugequal;
}
but when I try to use it with this command:

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alsamixer -D equal
I get:

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ALSA lib dlmisc.c:252:(snd1_dlobj_cache_get) Cannot open shared library /usr/local/lib/alsa-lib/libasound_module_ctl_equal.so
cannot open mixer: No such device or address
Then I tried to fix this by creating a symbolic link:

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cd /usr/local/lib/alsa-lib/
sudo ln -s /tmp/tcloop/alsaequal/usr/local/lib/libasound_module_ctl_equal.so libasound_module_ctl_equal.so
But then I get this error:

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Failed to load plugin "/usr/lib/ladspa/caps.so": /usr/lib/ladspa/caps.so: cannot open shared object file: No such file or directory
This one I tried to fix with this:

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cd /usr/lib
sudo mkdir ladspa
cd ladspa
sudo ln -s /tmp/tcloop/caps/usr/local/lib/ladspa/caps.so caps.so
But then I get this error:

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Unable to find label "Eq" in plugin library file "/usr/lib/ladspa/caps.so".
and now I am stuck..
Are the fixes I do correct? If so, is there a problem with this caps.so module?

Greetings,
    Gerrelt.

[bmarkus]

I do not see

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ldconfig
after creating symlink(s) to .so

[Gerrelt]

I've retried it, but now with the ldconfig, but I still get the same error message.

[Gerrelt]

It looks like I am running into this bug?  :

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=722143

[Gerrelt]

I just noticed that on Raspbian they are using a test- this version:

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pi@2-Blueberry-Keuken ~ $ sudo apt-cache show libasound2-plugin-equal
Package: libasound2-plugin-equal
Source: alsaequal
Version: 0.6-4
Architecture: armhf
According to this site this is a "TestingStable Version": https://packages.qa.debian.org/a/alsaequal.html
The one offered on the "DigitalMachine" site is probably an older "stable" version?

And this is interesting, this is from the releasenotes from 0.6-6 :

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* Fix Eq CAPS plugin name (Closes: #721355)
I think we need version 0.6-6 for this to work.


edit: just noticed 0.6-4 is called "stable"

[bmarkus]

There may be an issue with location where ALSA expect the plugin or version. I'm not familiar with such deails of ALSA and no time to investigate. I kindly advice you and other members interesting to play with it. They are small apps, easy to build, even not using the GNU autotools.

[Gerrelt]

OK, no problem, I will give it a try.

[lykkedk]

I had same experience, when i tried compiling the alsaequal myself, last week.

I ended up, with the conclusion, that the Eq must be renamed to Eq10 in the "makefiles" etc... in the build directory.

I tried some changes, but didnt work out... i will try tomorrow again i think, an post the results here

Jesper.

[Gerrelt]

Hi Jesper,

 I just discovered, by browsing through the sourcecode, you can tell alsaequal to use Eq10 instead of Eq.

You would have to ad a "module" to the asound.conf. My asound.conf now looks like this:

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ctl.equal {
   type equal;
   module "Eq10";
}

pcm.plugequal {
    type equal;
    slave.pcm "plughw:0,0";
    module "Eq10";
}

pcm.!default{
         type plug;
         slave.pcm plugequal;
}
Note that I added the module line twice.

But now I encounter a different, move vague problem. And the last time I did some programming in C is about 15 years ago...     (it's Java an C# I am using now)
So, understanding the code is a bit time consuming.

The error message I have now is:

Code: [Select]

ALSA lib ctl_equal.c:268:(_snd_ctl_equal_open) Problem with control file .alsaequal.bin, 3.
cannot open mixer: Operation not permitted
Sidenote: I also notice one can set the path to caps.so in the asound.conf. Might be usefull too.