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Compose an actual song

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This commit is contained in:
Anthony Wang 2023-01-06 20:13:43 -06:00
parent 4f243c6f49
commit 495b1fa59b
Signed by: a
GPG key ID: 42A5B952E6DD8D38
4 changed files with 70 additions and 20 deletions
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BIN
example.wav Normal file
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4
lambeat.scm
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@ -6,7 +6,7 @@
; Get the music as a list sampled at the bitrate
(define (play t end)
(cons (* 1/4 (tri (* t (music t))))
(cons (music t)
(if (< t end)
(play (+ t (/ 1 bitrate)) end)
'())))
@ -16,4 +16,4 @@
(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 4))
(play 0 16))

2
lib.scm
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@ -14,4 +14,4 @@
; Gets the frequency of a particular pitch
(define (getfreq octave pitch)
(* 55 (ash 1 octave) (expt 2 (/ pitch 13))))
(* 55 (ash 1 octave) (expt 2 (/ pitch 12))))

84
music.scm
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@ -1,25 +1,75 @@
(include "lib.scm")
; https://musiclab.chromeexperiments.com/Song-Maker/song/5761928473608192
; https://musiclab.chromeexperiments.com/Song-Maker/song/6414430911070208
(define (melody t)
(apply + (map (lambda (x)
(apply (lambda (octave pitch start len) ((note (getfreq octave pitch) start len) (- t 32))) x))
'(
; (2 5 0 1/4)
; (3 0 1 1/2)
; (2 8 3 1/4)
; (2 7 4 1/2)
; (2 5 6 1/4)
; (3 1 7 1/4)
; (3 0 8 1/4)
; (2 5 0 4)
; (3 0 8 4)
; (2 3 18 1)
; (2 10 20 1)
; (3 0 22 1)
; (3 1 24 1)
; (3 0 26 1)
; (2 10 27 1)
; (2 5 28 1)
; (3 0 30 1)
; (2 5 32 4)
; (3 0 38 4)
; (2 3 42 1)
; (3 1 44 1)
; (3 1 48 1)
; (2 10 49 1)
; (3 0 50 1)
; (3 1 51 1)
; (2 10 52 1)
; (2 8 53 1)
; (2 10 54 1)
; (3 0 56 1)
; (3 1 58 1)
; (3 0 60 1)
; (2 8 62 1)
(2 5 1 2)
(3 0 7 2)
(2 10 15 2)
(3 1 19 2)
(3 0 21 2)
(2 10 29 1)
(3 0 30 2)
))))
(define (base t)
(apply + (map (lambda (x)
(apply (lambda (octave pitch start len) ((note (getfreq octave pitch) start len) t)) x))
'(
(2 5 1 1)
(2 8 4 1)
(3 5 7 1)
(3 0 9 1)
(2 10 10 1)
(2 8 12 1)
(2 7 15 1)
(2 8 17 1)
(2 7 18 1)
(3 3 19 1)
(2 8 21 1)
(3 0 22 1)
(3 3 23 1)
(3 5 25 1)
(3 0 30 1)
(3 3 31 1)))))
(1 5 1 1)
(1 8 4 1)
(2 5 7 1)
(2 0 9 1)
(1 10 10 1)
(1 8 12 1)
(1 7 15 1)
(1 8 17 1)
(1 7 18 1)
(2 3 19 1)
(1 8 21 1)
(2 0 22 1)
(2 3 23 1)
(2 5 25 1)
(2 5 29 1)
(2 0 30 1)
(2 3 31 1)))))
(define (music t)
(melody (* t 8)))
(+ (* 1/2 (tri (* t (melody (floor-remainder (* t 8) 64)))))
(* 1/4 (tri (* t (base (floor-remainder (* t 8) 32)))))))