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Fix buffering issue

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This commit is contained in:
Anthony Wang 2023-01-21 21:18:06 -05:00
parent 495b1fa59b
commit 2d4f9323c6
Signed by: a
GPG key ID: 42A5B952E6DD8D38
3 changed files with 39 additions and 78 deletions
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14
lambeat.scm
View file

@ -2,18 +2,16 @@
(include "music.scm")
; Bitrate is the number time to sample the music function each second
(define bitrate 8000)
(define bitrate 44100)
; Get the music as a list sampled at the bitrate
(define (play t end)
(cons (music t)
(cons ((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)))) (music t))
(if (< t end)
(play (+ t (/ 1 bitrate)) end)
'())))
; 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 16))
(play 0 100)

8
lib.scm
View file

@ -5,12 +5,18 @@
(- (* 4 m) 1)
(- 3 (* 4 m)))))
; Square wave with a period of 1 second
(define (square t)
(let ((m (floor-remainder t 1)))
(if (< m 0.5) 1 -1)))
; Creates a note
(define (note freq start len)
(lambda (t) (
if (or (< t start) (>= t (+ start len)))
0
freq)))
(* 1/4 (tri (* 1.5 t freq))))))
;
; Gets the frequency of a particular pitch
(define (getfreq octave pitch)

95
music.scm
View file

@ -1,75 +1,32 @@
(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)
(define (music t)
(apply + (map (lambda (x)
(apply (lambda (octave pitch start len) ((note (getfreq octave pitch) start len) t)) x))
'(
(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)))))
; opening notes
(2 2 0 .1)
(2 6 .1 .1)
(2 9 .2 .1)
(3 1 .3 1.2)
(2 0 2 .1)
(2 4 2.1 .1)
(2 7 2.2 .1)
(2 11 2.3 .6)
(1 10 3 .1)
(2 2 3.1 .1)
(2 5 3.2 .1)
(2 9 3.3 .6)
(1 7 4 .1)
(1 11 4.1 .1)
(2 2 4.2 .1)
(2 6 4.3 4.2)
(define (music t)
(+ (* 1/2 (tri (* t (melody (floor-remainder (* t 8) 64)))))
(* 1/4 (tri (* t (base (floor-remainder (* t 8) 32)))))))
; A melody
(2 6 9 2.5)
(2 7 11.5 .5)
(2 6 12 .5)
(2 2 12.5 .5)
(2 9 13 1)
))))