break up into crates again

engine/time/time_note.rs

@@ -0,0 +1,35 @@
+pub struct NoteDuration;
+
+/// (pulses, name), assuming 96 PPQ
+pub const NOTE_DURATIONS: [(usize, &str);26] = [
+    (1,    "1/384"), (2,    "1/192"),
+    (3,    "1/128"), (4,    "1/96"),
+    (6,    "1/64"),  (8,    "1/48"),
+    (12,   "1/32"),  (16,   "1/24"),
+    (24,   "1/16"),  (32,   "1/12"),
+    (48,   "1/8"),   (64,   "1/6"),
+    (96,   "1/4"),   (128,  "1/3"),
+    (192,  "1/2"),   (256,  "2/3"),
+    (384,  "1/1"),   (512,  "4/3"),
+    (576,  "3/2"),   (768,  "2/1"),
+    (1152, "3/1"),   (1536, "4/1"),
+    (2304, "6/1"),   (3072, "8/1"),
+    (3456, "9/1"),   (6144, "16/1"),
+];
+
+impl NoteDuration {
+    /// Returns the next shorter length
+    pub fn prev (pulses: usize) -> usize {
+        for (length, _) in NOTE_DURATIONS.iter().rev() { if *length < pulses { return *length } }
+        pulses
+    }
+    /// Returns the next longer length
+    pub fn next (pulses: usize) -> usize {
+        for (length, _) in NOTE_DURATIONS.iter() { if *length > pulses { return *length } }
+        pulses
+    }
+    pub fn pulses_to_name (pulses: usize) -> &'static str {
+        for (length, name) in NOTE_DURATIONS.iter() { if *length == pulses { return name } }
+        ""
+    }
+}