20 Dec
2010
20 Dec
'10
10:41 a.m.
2010/12/20 Oliver Jaun <olijaun(a)yahoo.com>om>:
Hello
I bought the natural drum samples (http://www.naturaldrum.com/). It contains
WAVs and presets for Kontakt and Halion. Now I'd like to create some
gigasampler files in order to use it with linuxsampler.
The documentation of the natural drum sample library is quite good. The only
thing missing is the "loudness" of each sample in order to map each sample
to a velocity level from 0-127.
Loudness is a complex beast (i.e., lots of psychoacoustics involved).
What would you recommend in order to calculate the
"peek" of each drum
sample automatically? Is there a library which could do this? I would also
be happy with a command line tool like this:
$ peek bla.wav
Peek value: 12345
I could then write a C++-App using libgig.
Any ideas? Libraries? Algorithms?
Something like this could do the trick for you (pseudocode):
attack = 0.99
level = 0
peek = 0
for each sample
level = (1 - attack) * level + attack * abs(sample)
peek = MAX(peek, level)
(I suppose that samples have 0 mean, i.e. DC component filtered out)
The attack thing should be close but less than 1, you can try different values.
Stefano