Re: [Alsa-user] Problem with multichannel LADSPA plugins
Hi!
For everyone interested in a solution to the problem below: Thanks to
Benjamin Eikel, there is a great Howto in the ALSA wiki now.
http://alsa.opensrc.org/Low-pass_filter_for_subwoofer_channel_(HOWTO)
It only works with ALSA version 1.0.14rc2 (or probably above).
Regards, Ingo
Benjamin Eikel schrieb:
>>>
>>> I am trying to setup a lowpass filter for my subwoofer channel. I used
>>> the configuration template which is given in the ALSA wiki
>>> (http://alsa.opensrc.org/SurroundSound) as a template.
>>>
>>> My asound.conf works when I use it like it is given below (sound from all
>>> speakers). But when I uncomment the second LADSPA plugin for the lowpass
>>> (plugin number 1), then I will only hear sound from the subwoofer (so
>>> only channel number 2 is processed lowpass_21to21). The other channels
>>> seem to be muted. I also tried the same setup which is given in the Wiki
>>> mentioned above, but this does not work at all (the delay_0.01s plugin is
>>> called delay_0,01s on my machine; it think it's because of the German
>>> locale; that's why I am using the ids for the LADSPA plugins now). I
>>> tried to set the policy of my first LADSPA plugin (number 0) to 'none',
>>> but this did not help. I was still hearing only the sound from the
>>> subwoofer. I tried to use 3 plugins for the 3 channels, each with policy
>>> none, but this did not work too. The ALSA documentation I found (e.g.
>>> http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html) is not
>>> very helpful at all (I am not sure how to set these bindings inside the
>>> plugins correctly). When I connect upmix_20to51 directly to upmix_21to51,
>>> the sound is working fine (of course without lowpass).
>>>
>>> I would greatly appreciate any hint about what I am doing wrong.
>>>
>>> Regards,
>>> Benjamin Eikel
>>>
>>> Package versions (I am using Debian unstable):
>>> libasound2 1.0.13-1
>>> alsa-utils 1.0.13-1
>>> alsa-base 1.0.13-2
>>>
>>> My asound.conf:
>>> pcm.upmix_21to51 {
>>> type plug
>>> slave.pcm surround51
>>> slave.channels 6
>>> ttable {
>>> 0.0 1 # front left
>>> 1.1 1 # front right
>>> 0.2 1 # rear left
>>> 1.3 1 # rear right
>>> 0.4 0.5 # center
>>> 1.4 0.5 # center
>>> 2.5 1 # subwoofer
>>> }
>>> }
>>>
>>> pcm.upmix_20to51 {
>>> type plug
>>> slave.pcm lowpass_21to21
>>> slave.channels 3
>>> ttable {
>>> 0.0 1 # left channel
>>> 1.1 1 # right channel
>>> 0.2 0.5 # mix left and right ...
>>> 1.2 0.5 # ... channel for subwoofer
>>> }
>>> }
>>>
>>> pcm.lowpass_21to21 {
>>> type ladspa
>>> slave.pcm upmix_21to51
>>> path "/usr/lib/ladspa"
>>> channels 3
>>> plugins {
>>> 0 {
>>> id 1098 # Identity (Audio) (1098/identity_audio)
>>> policy duplicate
>>> input.bindings.0 "Input";
>>> output.bindings.0 "Output";
>>> }
>>> #1 {
>>> #id 1672 # 4 Pole Low-Pass Filter with Resonance
>>> (FCRCIA)(1672/lp4pole_fcrcia_oa) #policy none
>>> #input.bindings.2 "Input";
>>> #output.bindings.2 "Output";
>>> #input {
>>> # controls [ 300 0 ]
>>> #}
>>> #}
>>> }
>>> }
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Re: [Alsa-user] Problem with multichannel LADSPA plugins
Am Montag, 29. Januar 2007 13:28 schrieb Ingo Müller:
> Hi!
>
> I didn't get this to work either on ALSA 1.0.13. What I was able to do
> is use one or more plugins on all channels as well as one or more
> plugins on the first channel and one or more on all. Everything else
> didn't work, like applying a plugin to the second (third, forth...)
> channel only, applying one plugin to each channel etc... When I tried
> such configurations, strange things happend such as mute channels
> without apperent reasons. Finally, I gave up. I hope that this is a bug,
> that will be fixed soon. If anyone has a working asoundrc file that does
> one of the things that I wasn't able to do, please post it here! That'd
> be great.
>
> Regards, Ingo
Hello Ingo,
a developer wrote an answer to my first post and stated that this behaviour
was a bug. This will be fixed in the next ALSA release.
Regards,
Benjamin
>
> Benjamin Eikel schrieb:
> > Hello,
> >
> > I am trying to setup a lowpass filter for my subwoofer channel. I used
> > the configuration template which is given in the ALSA wiki
> > (http://alsa.opensrc.org/SurroundSound) as a template.
> >
> > My asound.conf works when I use it like it is given below (sound from all
> > speakers). But when I uncomment the second LADSPA plugin for the lowpass
> > (plugin number 1), then I will only hear sound from the subwoofer (so
> > only channel number 2 is processed lowpass_21to21). The other channels
> > seem to be muted. I also tried the same setup which is given in the Wiki
> > mentioned above, but this does not work at all (the delay_0.01s plugin is
> > called delay_0,01s on my machine; it think it's because of the German
> > locale; that's why I am using the ids for the LADSPA plugins now). I
> > tried to set the policy of my first LADSPA plugin (number 0) to 'none',
> > but this did not help. I was still hearing only the sound from the
> > subwoofer. I tried to use 3 plugins for the 3 channels, each with policy
> > none, but this did not work too. The ALSA documentation I found (e.g.
> > http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html) is not
> > very helpful at all (I am not sure how to set these bindings inside the
> > plugins correctly). When I connect upmix_20to51 directly to upmix_21to51,
> > the sound is working fine (of course without lowpass).
> >
> > I would greatly appreciate any hint about what I am doing wrong.
> >
> > Regards,
> > Benjamin Eikel
> >
> > Package versions (I am using Debian unstable):
> > libasound2 1.0.13-1
> > alsa-utils 1.0.13-1
> > alsa-base 1.0.13-2
> >
> > My asound.conf:
> > pcm.upmix_21to51 {
> > type plug
> > slave.pcm surround51
> > slave.channels 6
> > ttable {
> > 0.0 1 # front left
> > 1.1 1 # front right
> > 0.2 1 # rear left
> > 1.3 1 # rear right
> > 0.4 0.5 # center
> > 1.4 0.5 # center
> > 2.5 1 # subwoofer
> > }
> > }
> >
> > pcm.upmix_20to51 {
> > type plug
> > slave.pcm lowpass_21to21
> > slave.channels 3
> > ttable {
> > 0.0 1 # left channel
> > 1.1 1 # right channel
> > 0.2 0.5 # mix left and right ...
> > 1.2 0.5 # ... channel for subwoofer
> > }
> > }
> >
> > pcm.lowpass_21to21 {
> > type ladspa
> > slave.pcm upmix_21to51
> > path "/usr/lib/ladspa"
> > channels 3
> > plugins {
> > 0 {
> > id 1098 # Identity (Audio) (1098/identity_audio)
> > policy duplicate
> > input.bindings.0 "Input";
> > output.bindings.0 "Output";
> > }
> > #1 {
> > #id 1672 # 4 Pole Low-Pass Filter with Resonance
> > (FCRCIA)(1672/lp4pole_fcrcia_oa) #policy none
> > #input.bindings.2 "Input";
> > #output.bindings.2 "Output";
> > #input {
> > # controls [ 300 0 ]
> > #}
> > #}
> > }
> > }
>
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Re: [Alsa-user] Problem with multichannel LADSPA plugins
Hi!
I didn't get this to work either on ALSA 1.0.13. What I was able to do
is use one or more plugins on all channels as well as one or more
plugins on the first channel and one or more on all. Everything else
didn't work, like applying a plugin to the second (third, forth...)
channel only, applying one plugin to each channel etc... When I tried
such configurations, strange things happend such as mute channels
without apperent reasons. Finally, I gave up. I hope that this is a bug,
that will be fixed soon. If anyone has a working asoundrc file that does
one of the things that I wasn't able to do, please post it here! That'd
be great.
Regards, Ingo
Benjamin Eikel schrieb:
> Hello,
>
> I am trying to setup a lowpass filter for my subwoofer channel. I used the
> configuration template which is given in the ALSA wiki
> (http://alsa.opensrc.org/SurroundSound) as a template.
>
> My asound.conf works when I use it like it is given below (sound from all
> speakers). But when I uncomment the second LADSPA plugin for the lowpass
> (plugin number 1), then I will only hear sound from the subwoofer (so only
> channel number 2 is processed lowpass_21to21). The other channels seem to be
> muted. I also tried the same setup which is given in the Wiki mentioned
> above, but this does not work at all (the delay_0.01s plugin is called
> delay_0,01s on my machine; it think it's because of the German locale; that's
> why I am using the ids for the LADSPA plugins now).
> I tried to set the policy of my first LADSPA plugin (number 0) to 'none', but
> this did not help. I was still hearing only the sound from the subwoofer.
> I tried to use 3 plugins for the 3 channels, each with policy none, but this
> did not work too.
> The ALSA documentation I found (e.g.
> http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html) is not very
> helpful at all (I am not sure how to set these bindings inside the plugins
> correctly).
> When I connect upmix_20to51 directly to upmix_21to51, the sound is working
> fine (of course without lowpass).
>
> I would greatly appreciate any hint about what I am doing wrong.
>
> Regards,
> Benjamin Eikel
>
> Package versions (I am using Debian unstable):
> libasound21.0.13-1
> alsa-utils1.0.13-1
> alsa-base 1.0.13-2
>
> My asound.conf:
> pcm.upmix_21to51 {
> type plug
> slave.pcm surround51
> slave.channels 6
> ttable {
> 0.0 1 # front left
> 1.1 1 # front right
> 0.2 1 # rear left
> 1.3 1 # rear right
> 0.4 0.5 # center
> 1.4 0.5 # center
> 2.5 1 # subwoofer
> }
> }
>
> pcm.upmix_20to51 {
> type plug
> slave.pcm lowpass_21to21
> slave.channels 3
> ttable {
> 0.0 1 # left channel
> 1.1 1 # right channel
> 0.2 0.5 # mix left and right ...
> 1.2 0.5 # ... channel for subwoofer
> }
> }
>
> pcm.lowpass_21to21 {
> type ladspa
> slave.pcm upmix_21to51
> path "/usr/lib/ladspa"
> channels 3
> plugins {
> 0 {
> id 1098 # Identity (Audio) (1098/identity_audio)
> policy duplicate
> input.bindings.0 "Input";
> output.bindings.0 "Output";
> }
> #1 {
> #id 1672 # 4 Pole Low-Pass Filter with Resonance
> (FCRCIA)(1672/lp4pole_fcrcia_oa)
> #policy none
> #input.bindings.2 "Input";
> #output.bindings.2 "Output";
> #input {
> # controls [ 300 0 ]
> #}
> #}
> }
> }
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Re: [Alsa-user] Problem with multichannel LADSPA plugins
Hello again, Am Mittwoch, 20. Dezember 2006 16:09 schrieb Jaroslav Kysela: > On Tue, 19 Dec 2006, Benjamin Eikel wrote: > > Hello, > > > > I am trying to setup a lowpass filter for my subwoofer channel. I used > > the configuration template which is given in the ALSA wiki > > (http://alsa.opensrc.org/SurroundSound) as a template. > > > > My asound.conf works when I use it like it is given below (sound from > > all speakers). But when I uncomment the second LADSPA plugin for the > > lowpass (plugin number 1), then I will only hear sound from the > > subwoofer (so only channel number 2 is processed lowpass_21to21). The > > other channels seem to be muted. I also tried the same setup which is > > given in the Wiki mentioned above, but this does not work at all (the > > delay_0.01s plugin is called delay_0,01s on my machine; it think it's > > because of the German locale; that's why I am using the ids for the > > LADSPA plugins now). I tried to set the policy of my first LADSPA plugin > > (number 0) to 'none', but this did not help. I was still hearing only > > the sound from the subwoofer. I tried to use 3 plugins for the 3 > > channels, each with policy none, but this did not work too. The ALSA > > documentation I found (e.g. > > http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html) is not > > very helpful at all (I am not sure how to set these bindings inside the > > plugins correctly). When I connect upmix_20to51 directly to > > upmix_21to51, the sound is working fine (of course without lowpass). > > > > I would greatly appreciate any hint about what I am doing wrong. > > It was a bug (thanks for this report). The patch (or full file) which > corrects "policy none" behaviour is here: > > http://hg.alsa-project.org/alsa-lib?fd=b838a4b481c2;file=src/pcm/pcm_ladspa >.c > > Or, please, wait for the alsa-lib 1.0.14rc2 package which will contain > this change. > > Jaroslav > > - > Jaroslav Kysela <[EMAIL PROTECTED]> > Linux Kernel Sound Maintainer > ALSA Project, SUSE Labs okay. I am not able to check this patch until the weekend. But thank you for the fast response and fix!! Regards, Benjamin Eikel - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Problem with multichannel LADSPA plugins
On Tue, 19 Dec 2006, Benjamin Eikel wrote: > Hello, > > I am trying to setup a lowpass filter for my subwoofer channel. I used > the configuration template which is given in the ALSA wiki > (http://alsa.opensrc.org/SurroundSound) as a template. > > My asound.conf works when I use it like it is given below (sound from > all speakers). But when I uncomment the second LADSPA plugin for the > lowpass (plugin number 1), then I will only hear sound from the > subwoofer (so only channel number 2 is processed lowpass_21to21). The > other channels seem to be muted. I also tried the same setup which is > given in the Wiki mentioned above, but this does not work at all (the > delay_0.01s plugin is called delay_0,01s on my machine; it think it's > because of the German locale; that's why I am using the ids for the > LADSPA plugins now). I tried to set the policy of my first LADSPA plugin > (number 0) to 'none', but this did not help. I was still hearing only > the sound from the subwoofer. I tried to use 3 plugins for the 3 > channels, each with policy none, but this did not work too. The ALSA > documentation I found (e.g. > http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html) is not > very helpful at all (I am not sure how to set these bindings inside the > plugins correctly). When I connect upmix_20to51 directly to > upmix_21to51, the sound is working fine (of course without lowpass). > > I would greatly appreciate any hint about what I am doing wrong. It was a bug (thanks for this report). The patch (or full file) which corrects "policy none" behaviour is here: http://hg.alsa-project.org/alsa-lib?fd=b838a4b481c2;file=src/pcm/pcm_ladspa.c Or, please, wait for the alsa-lib 1.0.14rc2 package which will contain this change. Jaroslav - Jaroslav Kysela <[EMAIL PROTECTED]> Linux Kernel Sound Maintainer ALSA Project, SUSE Labs - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
