I've made a sound/audio thing

[Zelphir Kaltstahl]

Hello Guile users!

Recently I've looked at "how to write a wav file?" and wrote some code to output 
in RIFF-WAVE fie format: 
https://notabug.org/ZelphirKaltstahl/guile-examples/src/master/sound/riff-wave. 
It only writes a file currently, and does not read in any files yet. Hopefully I 
will work on it more soon.

My idea is, that Guile should be kind of perfect for making functions, which 
output sample values. Just combining functions. I want to make more effects like 
fade-in and fade out, amplify, change of sample rate or whatever else is simple 
to do. Already implemented things like a function to make another function 
"stepped" (is what I call it), so that one only gives an integer and it will 
give the sample of the index that is that integer, considering a previously 
given step size.

I imagine, that it should be possible, to build good abstractions over sample 
values and then give helper functions allowing anyone to make their own effects 
and so on. When reading in files is implemented, one could easily write a little 
Guile code and apply effects to any wav file.

I know libsndfile exists and perhaps I should be using FFI to interface with it, 
but I still have not gotten around to learning more about how to use FFI and 
also I made the mistake of looking at the implementation of wav file format in 
the libsndfile library … biiig mistake :D Well, I also would probably not have 
learned as much about wav files and some bytevector and vector stuff, if I had 
used libsndfile. Though more about FFI …

Will see how far I take it : )

Best regards,
Zelphir

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repositories: https://notabug.org/ZelphirKaltstahl