I probably don't know any answers, but would like to make sure I
at least understand the question. Are you trying do AGC on a
pair-wise basis? Or, is it something else you're trying to do?
Thanks,
Robert Riches
> Date: Sun, 13 Oct 2013 15:02:42 +0200
> From: Paolo Bolzoni <paolo.bolzoni.brown@xxxxxxxxx>
> To: Uwe <upunkt@xxxxxxxxxxxxxx>
> Cc: alsa-user@xxxxxxxxxxxxxxxxxxxxx
>
> I guess I can split the six channels in three limiters using the multi
> plugin, but how I can join them back?
> In the ladspa are other limiters, but they do not have the "gain"
> control so they do not actually increase the
> volume. Just adding plain 20db of amplification distorts the sound...
> Maybe there is an "limited amplifier"
> or something?
>
> I am trying to set-up a chain of plugins to always get the max volume...
>
>
> On Sun, Oct 13, 2013 at 12:58 AM, Uwe <upunkt@xxxxxxxxxxxxxx> wrote:
> > the problem with the configuration, I think, is: the plugins can handle a
> > maximum of 2 channels.
> >
> > unfortunately, I cannot tell you exactly how, but it *should* be possible to
> > route 3 pairs of channels to separate instances of the plugins.
> >
> > such a setup might also make sense musically. it might be a good idea to
> > setup separate plugins for "center" and "bass" because the signal in the
> > channels differs significantly from the left/right channels in frequency
> > range and level.
> >
> > have fun, Uwe
> >
> >
> > 2013/10/12 Paolo Bolzoni <paolo.bolzoni.brown@xxxxxxxxx>
> >>
> >> Dear list,
> >> This is my .asoundrc, and the pair compressor + limiter works fine for
> >> stereo input:
> >>
> >> ----------- >8
> >> pcm.ladcomp_compressor {
> >> type ladspa
> >> slave.pcm "ladcomp_limiter";
> >> path "/usr/lib/ladspa";
> >> plugins [{
> >> label dysonCompress
> >> input {
> >> #peak limit, release time, fast ratio, ratio
> >> controls [0 1 0.5 0.99] }
> >> }]
> >> }
> >>
> >> pcm.ladcomp_limiter {
> >> type ladspa
> >> slave.pcm "plughw:Audigy2";
> >> path "/usr/lib/ladspa";
> >> plugins [{
> >> label fastLookaheadLimiter
> >> input {
> >> #InputGain(Db) -20 -> +20 ; Limit (db) -20 -> 0 ; Release
> >> time (s) 0.01 -> 2
> >> controls [ 20 -1 0.8 ] }
> >> }]
> >> }
> >> 8< -----------
> >>
> >> Unfortunately, it does not work for 6 channels.
> >>
> >> I.e., this one works fine (I setup my system to use a certain PCM
> >> via environment variable):
> >> $ ALSAPCM='pcm.ladcomp_compressor' speaker-test -c 2 -t wav -l 5
> >>
> >> This one does not and you hear only the left and right channels.
> >> $ ALSAPCM='pcm.ladcomp_compressor' speaker-test -c 6 -t wav -l 5
> >>
> >> Of course the hardware is wired correctly and this one works as expected:
> >> $ ALSAPCM='pcm.surround51' speaker-test -c 6 -t wav -l 5
> >>
> >>
> >> Since normally you have to select surround51 manually I thought that the
> >> problem could be in the output pcm, and I rewrote like this. But it is the
> >> same:
> >>
> >> ----------- >8
> >> #[...] analogous 51 compressor omitted
> >>
> >> pcm.plug51 {
> >> type plug
> >> slave.pcm "surround51"
> >> slave.channels 6
> >> }
> >>
> >> pcm.ladcomp_limiter51 {
> >> type ladspa
> >> slave.pcm "plug51"
> >> path "/usr/lib/ladspa"
> >> plugins [{
> >> label fastLookaheadLimiter
> >> input {
> >> #InputGain(Db) -20 -> +20 ; Limit (db) -20 -> 0 ; Release
> >> time (s) 0.01 -> 2
> >> controls [ 20 -1 0.8 ] }
> >> }]
> >> }
> >> 8< -----------
> >>
> >> Is there a way? Any insight?
> >>
> >> Yours faithfully,
> >> Paolo
> >>
> >>
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