How hard can it be? Audio processing

From	The Natural Philosopher <tnp@invalid.invalid>
Newsgroups	comp.lang.javascript
Subject	How hard can it be? Audio processing
Date	2021-03-23 12:10 +0000
Organization	A little, after lunch
Message-ID	<s3clre$o5j$1@dont-email.me> (permalink)

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In principle audio processing in more or less real time is simple. You 
need a 'call back' function that gets presented with one or more samples 
of digital audio, and you return one or more samples of modified data, 
modified by the state of some [global] variables (controls) and the 
state of the sample, and previous ones...in essence that is ALL digital 
signal processing does, or needs to do. The cleverness is in the 
algorithms that do the modification.

<rant>Until object orientation and computer scientists (after 
ArtStudents™, the next most dangerous class to be allowed near a 
computer) get in the way, and you need a 100k library just to even 
change the volume.

And as is usual with any API, the documentation tells you how to use it, 
but never why you might want to, and invents a huge number of new 
concepts that are completely unnecessary in order to preserve the 
sanctity of the CodeGurus™ who wrote the damn thing.
</rant>

So my question is this: what is the simplest and most minimal way to 
'intercept' a stereo  audio stream - might be from a file, might be from 
a radio station or live TV stream - in a browser and do so minimalist 
signal processing that is NOT provided by some 3rd party library, but 
actual self written code in terms of 'modify this sample dependent on 
the state of a global variable or variables, and previous samples'

Answers in less than 10k lines of code will get a virtual beer token


-- 
There is something fascinating about science. One gets such wholesale 
returns of conjecture out of such a trifling investment of fact.

Mark Twain

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How hard can it be? Audio processing The Natural Philosopher <tnp@invalid.invalid> - 2021-03-23 12:10 +0000
  Re: How hard can it be? Audio processing JJ <jj4public@gmail.com> - 2021-03-23 21:01 +0700
    Re: How hard can it be? Audio processing The Natural Philosopher <tnp@invalid.invalid> - 2021-03-23 17:17 +0000
      Re: How hard can it be? Audio processing JJ <jj4public@gmail.com> - 2021-03-24 23:16 +0700
        Re: How hard can it be? Audio processing The Natural Philosopher <tnp@invalid.invalid> - 2021-03-24 17:48 +0000
  Re: How hard can it be? Audio processing John G Harris <niam@jghnorth.org.uk.invalid> - 2021-03-24 18:38 +0000
    Re: How hard can it be? Audio processing The Natural Philosopher <tnp@invalid.invalid> - 2021-03-24 20:03 +0000
  Re: How hard can it be? Audio processing "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2021-03-24 18:01 -0700
    Re: How hard can it be? Audio processing The Natural Philosopher <tnp@invalid.invalid> - 2021-03-25 07:39 +0000
      Re: How hard can it be? Audio processing The Natural Philosopher <tnp@invalid.invalid> - 2021-03-25 07:50 +0000
        Re: How hard can it be? Audio processing "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2021-03-25 06:10 -0700

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