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.br...@gmail.com>
> 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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這只是警告訊息。
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