Changes

5 changed files (+59/-43)

• README.md
  • @@ -1,4 +1,5 @@
    # Lambeat - Bytebeat in Scheme + Lambeat is a new way to make music using functional programming. It's heavily influenced by [Bytebeat](https://dollchan.net/bytebeat) and initially started out as an reimplementation of Bytebeat in Scheme. Since then, it's grown to be a delightful new way to make music with code. - You can use `guile main.scm | play -r 8000 -t s16 -v 0.25 -` to try it out. + ## Get started + First, install [Sox](https://sox.sourceforge.net/) and clone this repo. Write some music in `music.scm`. Enjoy your music with `guile lambeat.scm | play -r 8000 -t s16 -`!
• lambeat.scm (new)
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    + (use-modules (ice-9 binary-ports)) + (include "music.scm") + + (define bitrate 8000) + + ; Get the music as a list sampled at the bitrate + (define (play t) ( + cons (music t) (if (< t 30) + (play (+ t (/ 1 bitrate))) + '() + ) + )) + + ; Output the list in the s16 raw audio format + (for-each (lambda (a) ( + let ((b (modulo (inexact->exact (round (* (+ a 2) 32768))) 65536))) + cons + (put-u8 (current-output-port) (modulo b 256)) + (put-u8 (current-output-port) (quotient b 256)) + )) (play 0))
• lib.scm (new)
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    + (define (saw t) ( + let ((m (floor-remainder (+ t (/ 1 4)) 1))) + (if (< m 1/2) + (- (* 4 m) 1) + (- 3 (* 4 m))) + )) + + (define (note freq start len) ( + lambda (t) ( + if (or (< t start) (>= t (+ start len))) + 0 + (saw (* freq t)) + ) + )) + + (define (getfreq octave pitch) ( + * 55 (ash 1 octave) (expt 2 (/ pitch 13)) + ))
• main.scm (deleted)
  • @@ -1,41 +0,0 @@
    - (use-modules (ice-9 binary-ports)) - - (define bitrate 8000) - - (define (saw t) ( - let ((m (floor-remainder (+ t (/ 1 4)) 1))) - (if (< m 1/2) - (- (* 4 m) 1) - (- 3 (* 4 m))) - )) - - (define (note freq start len) ( - lambda (t) ( - if (or (< t start) (>= t (+ start len))) - 0 - (saw (* freq t)) - ) - )) - - (define (music t) (+ - ((note 523.25 0 1) t) - ((note 587.33 1 1) t) - ((note 659.25 2 1) t) - ((note 698.46 3 1) t) - ((note 783.99 4 1) t) - )) - - (define (play t) ( - cons (music t) (if (< t 5) - (play (+ t (/ 1 bitrate))) - '() - ) - )) - - ;(display (play 0)) - (for-each (lambda (a) ( - let ((b (modulo (inexact->exact (round (* (+ a 2) 32768))) 65536))) - cons - (put-u8 (current-output-port) (modulo b 256)) - (put-u8 (current-output-port) (quotient b 256)) - )) (play 0))
• music.scm (new)
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    + (include "lib.scm") + + (define (melody t) (+ + ((note (getfreq 3 4) 0 1/4) t) + ((note (getfreq 3 8) 1/4 1/4) t) + ((note (getfreq 3 4) 3/4 1/4) t) + ((note (getfreq 3 11) 1 1/4) t) + ((note (getfreq 3 4) 5/4 1/4) t) + ((note (getfreq 3 2) 3/2 1/4) t) + ((note (getfreq 3 8) 7/4 1/4) t) + ((note (getfreq 3 4) 9/4 1/4) t) + ((note (getfreq 3 11) 5/2 1/4) t) + ((note (getfreq 3 4) 11/4 1/4) t) + )) + + (define (music t) ( + melody (floor-remainder t 3) + ))