[erlang-questions] Generating sine waves and/or audio stream output
Fri Mar 26 10:35:21 CET 2010
You've done all the hard work!
Thanks Willem. I'll write a function to write a wav header and report
back: I've got one I wrote in C somewhere; might be interesting to
compare the two.
I'll also look into streaming to audio (there is esdl, an erlang binding
for sdl, but that looks a bit hefty, and doesn'ty work with smp enabled
On 25/03/2010 19:04, Willem de Jong wrote:
> Hmm, I had forgotten about some of the complexities involved.
> I do not have a function that writes wav files. I put the pcm data
> that is generated by this into a flash file. For wav files you have to
> do add a header and framing, I believe.
> I added a function that puts together the parts of the sound. You can
> write it to a file like this:
> > file:write_file("sinus.raw", sound:sound(440, 3, 0.5, sinus)).
> (440 hertz, 3 seconds, volume 0.5 (50%), sinus wave form).
> This file will be in "raw" format (pcm without headers). With the
> current settings the sample rate is 22050, mono, sample size 16 bits
> big endian.
Ivan A. Uemlianin
Speech Technology Research and Development
"Froh, froh! Wie seine Sonnen, seine Sonnen fliegen"
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