Listen to midi

common/src/commonMain/kotlin/nl/astraeus/vst/Note.kt

@@ -3,6 +3,7 @@ package nl.astraeus.vst
 import kotlin.math.max
 import kotlin.math.min
 import kotlin.math.pow
+import kotlin.math.round
 
 /**
  * User: rnentjes
@@ -15,17 +16,17 @@ enum class Note(
   val flat: String
 ) {
   NONE("---", "---"),
-  NO02("",""),
-  NO03("",""),
-  NO04("",""),
-  NO05("",""),
-  NO06("",""),
-  NO07("",""),
-  NO08("",""),
-  NO09("",""),
-  NO10("",""),
-  NO11("",""),
-  NO12("",""),
+  No02("C--","C--"),
+  NO03("C#-","Db-"),
+  NO04("D--","D--"),
+  NO05("D#-","Eb-"),
+  NO06("E--","E--"),
+  NO07("F--","F--"),
+  NO08("F#-","Gb-"),
+  NO09("G--","G--"),
+  NO10("G#-","Ab-"),
+  NO11("A#-","Bb-"),
+  NO12("B--","B--"),
   C0("C-0","C-0"),
   C0s("C#0","Db0"),
   D0("D-0","D-0"),
@@ -152,7 +153,7 @@ enum class Note(
   ;
 
   // 69 = A4.ordinal
-  val freq: Double = 440.0 * 2.0.pow((ordinal - 69)/12.0)
+  val freq: Double = round(440.0 * 2.0.pow((ordinal - 69)/12.0) * 100.0) / 100.0
   val cycleLength: Double = 1.0 / freq
   var sampleDelta: Double = 0.0
 
@@ -162,14 +163,12 @@ enum class Note(
     result = min(result, G9.ordinal)
     result = max(result, C0.ordinal)
 
-    entries.firstOrNull { it.ordinal == result } ?: this
+    fromMidi(result)
   } else {
     this
   }
 
   companion object {
-    var sampleRate: Int = 44100
-
     fun fromMidi(midi: Int): Note {
       // todo: add check
       return entries[midi]
@@ -177,10 +176,16 @@ enum class Note(
 
     fun updateSampleRate(rate: Int) {
       println("Setting sample rate to $rate")
-      sampleRate = rate
       for (note in Note.entries) {
-        note.sampleDelta = (1.0 / sampleRate.toDouble()) / note.cycleLength
+        note.sampleDelta = (1.0 / rate.toDouble()) / note.cycleLength
       }
     }
   }
 }
+
+// freq = 10Hz
+// cycleLength = 0.1
+// sampleRate = 48000
+// sampleDelta = 4800
+
+// (1.0 / freq) * sampleRate