wip: refactor into crates

crates/tek_sequencer/src/midi.rs

@@ -0,0 +1,36 @@
+use crate::*;
+use tek_jack::jack::*;
+
+/// MIDI message serialized to bytes
+pub type MIDIMessage = Vec<u8>;
+
+/// Collection of serialized MIDI messages
+pub type MIDIChunk = [Vec<MIDIMessage>];
+
+/// Add "all notes off" to the start of a buffer.
+pub fn all_notes_off (output: &mut MIDIChunk) {
+    let mut buf = vec![];
+    let msg = MidiMessage::Controller { controller: 123.into(), value: 0.into() };
+    let evt = LiveEvent::Midi { channel: 0.into(), message: msg };
+    evt.write(&mut buf).unwrap();
+    output[0].push(buf);
+}
+
+/// Return boxed iterator of MIDI events
+pub fn parse_midi_input (input: MidiIter) -> Box<dyn Iterator<Item=(usize, LiveEvent, &[u8])> + '_> {
+    Box::new(input.map(|RawMidi { time, bytes }|(
+        time as usize,
+        LiveEvent::parse(bytes).unwrap(),
+        bytes
+    )))
+}
+
+/// Write to JACK port from output buffer (containing notes from sequence and/or monitor)
+pub fn write_midi_output (writer: &mut MidiWriter, output: &MIDIChunk, frames: usize) {
+    for time in 0..frames {
+        for event in output[time].iter() {
+            writer.write(&RawMidi { time: time as u32, bytes: &event })
+                .expect(&format!("{event:?}"));
+        }
+    }
+}