At Wed, 28 Jan 2004 18:05:46 +0100,
Florian Schmidt wrote:
>
>
> Hi, as far as i understand it, the copy plugin does nothing but copy its
> input to its output. I wonder if it would be easily possible to extend
> this plugin to copy to multiple slave pcms. This way it would be
> (easily?) possible to "distribute" a stereo signal to 4 or even 6
> channels.
route (and plug) plugin already can do that.
for example,
pcm.ch40dup {
type route
slave.pcm surround40
slave.channels 4
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
}
pcm.ch51dup {
type route
slave.pcm surround51
slave.channels 6
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
ttable.0.4 0.5
ttable.1.4 0.5
ttable.0.5 0.5
ttable.1.5 0.5
}
and you can play two channel WAV like
% aplay -Dch40dup 2ch-stereo.wav
% aplay -Dch51dup 2ch-stereo.wav
for 4.0 and 5.1 surrounds, respectively.
of course, this is just copy of left/right samples, no dolby prologic
effect is included ;)
Takashi
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