wip: prototype chains/stacks

src/device/sequencer/midi.rs

@@ -0,0 +1,52 @@
+pub struct MIDISequence {
+    channels: [MIDISequenceChannel;16],
+}
+
+pub struct MIDISequenceChannel {
+    number: u8,
+    notes: [MIDISequenceVoice;128],
+}
+
+pub type MIDISequenceVoice = std::collections::BTreeMap<u32, NoteEvent>;
+
+#[derive(Clone)]
+pub enum NoteEvent {
+    On(u8),
+    Off(u8),
+}
+
+const VOICE_EMPTY: MIDISequenceVoice = MIDISequenceVoice::new();
+
+impl MIDISequence {
+    fn new () -> Self {
+        Self {
+            channels: [
+                MIDISequenceChannel::new(1),
+                MIDISequenceChannel::new(2),
+                MIDISequenceChannel::new(3),
+                MIDISequenceChannel::new(4),
+                MIDISequenceChannel::new(5),
+                MIDISequenceChannel::new(6),
+                MIDISequenceChannel::new(7),
+                MIDISequenceChannel::new(8),
+                MIDISequenceChannel::new(9),
+                MIDISequenceChannel::new(10),
+                MIDISequenceChannel::new(11),
+                MIDISequenceChannel::new(12),
+                MIDISequenceChannel::new(13),
+                MIDISequenceChannel::new(14),
+                MIDISequenceChannel::new(15),
+                MIDISequenceChannel::new(16),
+            ]
+        }
+    }
+}
+
+impl MIDISequenceChannel {
+    fn new (number: u8) -> Self {
+        Self {
+            number,
+            notes: [VOICE_EMPTY;128]
+        }
+    }
+}