shithub: rc

ref: d15d7396ab5d78c794014a2273a877821b860644
dir: /bin/tune/

#!/bin/rc
fn usage{
	echo usage: $0 '[-p NSEMITONE]' '[-t PERCENT]'
	exit usage
}

p=0
t=100
while(~ $1 -?){
	switch($1){
	case -p
		p=$2
		shift
	case -t
		t=$2
		shift
	case *
		usage
	}
	shift
}
if(~ $#p 0 && ~ $#t 0)
	usage
eval `{awk -v p'='^$p -v t'='^$t '
BEGIN{
	c = ""
	if(p != 0){
		if(p < 0)
			p = 1.0 / (1.0594631 ^ -p)
		else if(p > 0){
			p = 1.0594631 ^ p
			if(p > 4.0)
				p = 4.0
		}
		c = "audio/stretch -s -r " p
		if(t != 100)
			c = c " | "
	}
	if(t != 100){
		if(t < 0)
			t = 1
		else if(t <= 100){
			t = 1.0 + (1 - t / 100)
			if(t > 4.0)
				t = 4.0
		}else{
			t = 100 / t
			if(t < 0.25)
				t = 0.25
		}
		c = c "audio/stretch -r " t
	}
	print c
}
'}