1 files changed, 25 insertions, 0 deletions
diff --git a/src/types.rs b/src/types.rs
index b9ff15f..dd450bb 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -1 +1,26 @@
 pub type Sample = f32;
+
+pub enum Pitch {
+    Freq(f32),
+    MIDI(f32),
+}
+
+impl Pitch {
+    pub fn to_midi(&self) -> f32 {
+        match *self {
+            Pitch::MIDI(x) => x,
+            Pitch::Freq(x) => 
+                12.0 * (x / 440.0).log2() + 69.0,
+        }
+    }
+    pub fn to_midi_pitch(&self) -> Pitch { Pitch::MIDI(self.to_midi()) }
+
+    pub fn to_freq(&self) -> f32 {
+        match *self {
+            Pitch::MIDI(x) =>
+                440.0 * (2.0f32).powf((x - 69.0) / 12.0),
+            Pitch::Freq(x) => x,
+        }
+    }
+    pub fn to_freq_pitch(&self) -> Pitch { Pitch::Freq(self.to_freq()) }
+}