some new songs and small modifications

1 files changed, 13 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 5fa7e79..23fffe2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -245,6 +245,19 @@ impl Default for Hertz {
     }
 }
 
+impl Semitones {
+    /// Return the octave of the semitone.
+    fn octave(self) -> (usize, usize) {
+        let translated = *self + 9f64;
+
+        let quotient = translated.div_euclid(12f64) as i64;
+
+        let rem = translated.rem_euclid(12f64) as usize;
+
+        ((quotient + 4) as usize, rem)
+    }
+}
+
 impl From<Semitones> for Hertz {
     fn from(st: Semitones) -> Self {
         (*Self::default() * STD_BASE.powf(*st)).into()