wip: refactor into fewer crates

crates/device/src/sampler/sampler_midi.rs

@@ -0,0 +1,54 @@
+use crate::*;
+
+pub type MidiSample = (Option<u7>, Arc<RwLock<crate::Sample>>);
+
+impl Sampler {
+
+    /// Create [Voice]s from [Sample]s in response to MIDI input.
+    pub fn process_midi_in (&mut self, scope: &ProcessScope) {
+        let Sampler { midi_in, mapped, voices, .. } = self;
+        if let Some(ref midi_in) = midi_in {
+            for RawMidi { time, bytes } in midi_in.port().iter(scope) {
+                if let LiveEvent::Midi { message, .. } = LiveEvent::parse(bytes).unwrap() {
+                    match message {
+                        MidiMessage::NoteOn { ref key, ref vel } => {
+                            if let Some(ref sample) = mapped[key.as_int() as usize] {
+                                voices.write().unwrap().push(Sample::play(sample, time as usize, vel));
+                            }
+                        },
+                        MidiMessage::Controller { controller, value } => {
+                            // TODO
+                        }
+                        _ => {}
+                    }
+                }
+            }
+        }
+    }
+
+}
+
+impl Sample {
+    pub fn handle_cc (&mut self, controller: u7, value: u7) {
+        let percentage = value.as_int() as f64 / 127.;
+        match controller.as_int() {
+            20 => {
+                self.start = (percentage * self.end as f64) as usize;
+            },
+            21 => {
+                let length = self.channels[0].len();
+                self.end = length.min(
+                    self.start + (percentage * (length as f64 - self.start as f64)) as usize
+                );
+            },
+            22 => { /*attack*/ },
+            23 => { /*decay*/  },
+            24 => {
+                self.gain = percentage as f32 * 2.0;
+            },
+            26 => { /* pan */ }
+            25 => { /* pitch */ }
+            _ => {}
+        }
+    }
+}