Cody Boone Ferguson
9e456b4750
In particular the following diff for each README.md (with all the
index.html files rebuilt):
-Watch the following [Our Favorite Universe](https://www.youtube.com/@OurFavoriteUniverse) YouTube show:
+Watch the [Our Favorite Universe](https://www.youtube.com/@OurFavoriteUniverse)
+YouTube show for this entry:
102 lines
2.7 KiB
Markdown
102 lines
2.7 KiB
Markdown
## Award presentation:
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Watch the [Our Favorite Universe](https://www.youtube.com/@OurFavoriteUniverse)
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YouTube show for this entry:
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> [IOCCC28 - 2024/straadt - Prize in sound coding](https://www.youtube.com/watch?v=QYFXRvt0VJo)
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## To build:
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``` <!---sh-->
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make all
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```
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## To use:
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``` <!---sh-->
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./prog
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```
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## Try:
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``` <!---sh-->
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./prog
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```
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and then play the resulting `prog.wav` using a sound player.
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## Judges' remarks:
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When you run the program, after several moments, a `prog.wav` sound file is produced.
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Using a sound player (you may find `sox(1)` is a good choice), you may enjoy the result.
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Can you figure out how it produces the various layers of instruments?
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## Author's remarks:
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### Obfuscations
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- "Helpful" formatting
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- Character salad
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- Loop exit trying to hide by a switch statement
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- Strong string encryption. By that I mean "fmt"=>"gnu".
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- A `/*{*/` that throws off bracket matching in vim. Begun the editor wars
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have! (Wait, I'm **on** the vim-team!)
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- `cm` and `ap` stands for "allpass" and "comb", respectively.
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- One effect was created with deliberate "memory corruption".
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To encourage tinkering I've obfuscated the song data and program (see Y()) less
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than the "library code". Sorry if you wanted to tinker with the library code!
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### Sound quality
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The sample rate of prog.wav is 256kHz because creating aliasing-free waveforms
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would require more code, but you can always oversample the audio and pass the
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anti-aliasing problem on to the audio player :-) However, the downsampler in my
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`mplayer(1)` is poor, but you can use the high-quality resampler in `sox(1)` to create a
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48kHz version:
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``` <!---c--->
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sox prog.wav -r 48000 prog.48kHz.wav
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```
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### Tricks (the condescending part)
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- Kick drum from sines, pitched up to create toms.
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- Roland TR-808 style hi-hats (a bunch of high-pass filtered square waves).
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- SID/C64-style snare drum (oscillates between noise and square wave).
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- There's some FM synthesis in the bass.
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- Schroeder reverberator a la Freeverb. The same building blocks are used for
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the echo effect.
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- Waveshaping/overdrive using tanh(x), ohh yeaaah..
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I used this Python snippet to generate `q0[2]` and `q0[3]`:
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``` <!---python-->
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def X(s): print(hex(int(s.replace("x","1").replace(".","0")[::-1],2))) # not for iopcc-use
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X(".x.x..xx.x.xx.xxx.xx.xxx..xx.xxx")
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X("x.xx.x.x.x.xxxxxx.xx.xxx.xxxxxxx")
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```
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<!--
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Copyright © 1984-2025 by Landon Curt Noll and Leonid A. Broukhis. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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