Subject: Re: [linux-audio-dev] LADSPA hard_rt_capable
From: Kai Vehmanen (kaiv_AT_wakkanet.fi)
Date: Mon Dec 11 2000 - 21:40:57 EET
On Mon, 11 Dec 2000, Steve Harris wrote:
> (which I can do just by changing the chunk size, I think ecasound can do
> this). Its a bit more tricky for plugins that do parameter watching
> though.
Hmm, you could use ecasound's controllers for this. So something like:
ecasound -b:32 -t:5 -i somedata.wav -o /dev/dsp -eli:1191,1,1,1,0 -kl:3,0.5,100,5.0
That would play 5 seconds of somedata.wav applying your flanger plugin (id
1191), using a linear fade-in controller to control the lfo-freq (3rd
param), sliding from 0.5 to 100Hz during the 5 seconds. Hmm, and for more
useful stats, /dev/dsp should be replaced with 'null'. Here's some results
(dual-celeron 466):
###| ~/CVS |$ time ecasound -b:32 -t:5 -i /empty1/track04.wav -o null -eli:1191,1,1,1,0 -kl:3,0.5,100,5.0
[...]
17.63user 0.05system 0:17.69elapsed 99%
###| ~/CVS |$ time ecasound -b:4096 -t:5 -i /empty1/track04.wav -o null -eli:1191,1,1,1,0 -kl:3,0.5,100,5.0
[...]
0.71user 0.07system 0:00.78elapsed 99%CPU
For comparison, same test using the simple amplify effect:
###| ~/CVS |$ time ecasound -b:32 -t:5 -i /empty1/track04.wav -o null -ea:100 -kl:1,0.5,100,5.0
[...]
0.32user 0.02system 0:00.34elapsed 99%CPU
###| ~/CVS |$ time ecasound -b:4096 -t:5 -i /empty1/track04.wav -o null -ea:100 -kl:1,0.5,100,5.0
[...]
0.25user 0.06system 0:00.30elapsed 100%
... so as expected, it does have quite an effect. Btw; -b:x specifies the
block size in sample frames. This is also the parameter refresh-rate (yup,
the legendary "bad design" :)).
-- . http://www.eca.cx ... [ audio software for linux ] /\ . . http://www.eca.cx/sculpscape [ my armchair-tunes mp3/ra/wav ]
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