====== Project: Algorithmic Soundscapes ======
{{tag>project hardware software electronics audio music hadez}}
===== Wat? =====
Have a c-oneliner generate something you can directly pipe into /dev/dsp or aplay.
For an example (this actually started it) check out [[http://www.youtube.com/watch?v=qlrs2Vorw2Y|this YouTube video]].

The code usually follows the basic pattern of
<code>main(t){for(t=0;;++t)putchar(  X  );}</code>
Where X is a formula based on t.  You can compile it as follows:

  # code in code.c
  gcc -xc -lm code.c
  ./code | aplay

If you don't want to compile it yourself, you can use an online service like http://wurstcaptures.untergrund.net/music/ to render the first few seconds of your track.

You can also compile it inline and have it play directly:

  echo "main(t){for(t=0;;++t)putchar(  X  );}"|gcc -xc -lm -&&./a.out|aplay

Note the -lm in both cases which links against the math library so you can use sin, cos, tan, et al.

===== Collection =====
^Formula ^Who ^Comment ^
|<code>(t|t>>8)>>(t>>7)|(t<<6|t<<8)>>(t>>11)|(t<<7|t<<11)>>(t>>11)</code> |[[leute:hadez]] | |
|<code>(t|t>>17)>>(t>>7)|(t<<2|t<<8)>>(t>>11)|(t<<2|t<<11)>>(t>>17)</code> |h0uz3 |cool morse blips after a while |
|<code>(int)sin(t>>16)|(t|t>>8)</code> |[[leute:hadez]] |slow chippy bassline |
|<code>(t>>9&t>>8)*(t>>3)</code> |h0uz3 | Ready for a horror trip? Just add some LSD... |
|<code>(t>>8|t-2)&(2-t|8<<t)</code> |h0uz3 | Symmetries are for pussies |
|<code>((t>>8|t-2)&(2-t|8<<t))<<((t>>8|t-2)&(2-t|8<<t))>>((t>>8|t-2)&(2-t|8<<t))</code> |h0uz3 | Downward spiral |
|<code>((t>>3|t<<7)|t>>11)|t>>16</code> |h0uz3 | Time to wake up, huh? |
|<code>((((t>>3|t<<7)|t>>11)|t>>16)&23)</code> |h0uz3 | 23 makes everything a little more sane |
|<code>((sin((t%17)*3.1415*0.5)*100)<<t/90)|(sin(t*t*3.1415*0.5)*50)</code>]]|[[leute:samuirai]]|dramatic space aliens|
|<code>((t>>4)|(t<<4)&0x11111+t/1000)</code>|[[leute:tv]]|Baby-[[https://github.com/krebscode/painload/tree/master/K%C3%BCbelwagen|Kübelwagen]]-Alarm-Therapist #x1 [pre]|
|<code>t<700000?((t/2000%2?t<<3:t<<2)>>(t/10000%3)<<t/100000)
:t<800000?-t*t*t>>(t/1000)|t/(800000-t)
:t<805000?t<<(t/500)
:/*"fin"*/1/(t-t)</code>|[[leute:tv]]|Alarm-Symphony #x2 (w/happy end)|
|<code>((t>>7)* 0xff) * (t & 0xff)/32 & ~(t / 127)</code>|bdwheele| Almost pac-man |
|Stereo Version: http://preview.tinyurl.com/65pjn98 | sso | 8-Bit Psytrance? Try at 22050Hz Sampling Rate! |
|<code>((t>>10)<<((t>>4)%([8,9,10,11][(t>>11)%4]-(t>>15)%4)))</code>|tito|Boss level|

===== Tips & Tricks =====
  * add multiple voices using eg. bitwise or "**|**"
  * use operators and bitmasks! +,-,*,/ and &,^,|,<<,>>
  * exploit math functions (sin, cos, tan, ...)
  * shift left for higher notes "**<<**"
  * shift right for lower notes "**>>**"
  * add rhythm by shifting everything right by a right-shift of t "(formula)**>>(t>>N)**", the bigger N, the higher the rhythm frequency
  * as with everything algorithmically generated: prime numbers are your friend! they make it sound so much more interesting by yielding less repetitive output
  * build chords!
    * note 1: <code>(t<<6|t<<8)>>(t>>11)</code>
    * note 2: <code>(t<<7|t<<11)>>(t>>11)</code>
    * combine: <code>(t<<6|t<<8)>>(t>>11)|(t<<7|t<<11)>>(t>>11)</code>