From bc14d6a631a6305ae1647c7e45f98af35930052b Mon Sep 17 00:00:00 2001
From: Jake Zerrer <him@jakezerrer.com>
Date: Tue, 4 Nov 2025 09:30:49 -0500
Subject: Adding basic midi filter functions

---
 src/midi.clj    | 36 ++++++++++++++++++++++++++++++------
 src/scratch.clj | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 6 deletions(-)
 create mode 100644 src/scratch.clj

(limited to 'src')

diff --git a/src/midi.clj b/src/midi.clj
index fcd9d64..bfe075e 100644
--- a/src/midi.clj
+++ b/src/midi.clj
@@ -7,12 +7,13 @@
 (defn get-all-midi-device-info []
   (CoreMidiDeviceProvider/getMidiDeviceInfo))
 
+;; Move to tools.repl
 (defn print-all-midi-devices
   "Prints the names of all MIDI devices attached to the computer."
   []
   (doseq [^MidiDevice$Info device-info (get-all-midi-device-info)]
     (println (.getName device-info))))
-(print-all-midi-devices)
+
 (defn select-devices
   "Given device info list `devices`, return seq where device name is `device-name`.
   If tx? is true, returned devices will have unlimited transmitters.
@@ -186,15 +187,10 @@
                         (m/amb
                          (m/? rv)
                          (recur)))))))))))
-(def run
-  (echo "CoreMIDI4J - IAC Bus" 0 0))
 
 ;; CoreMidiSource is TX Device
 ;; CoreMidiDestination is RX Device
 
-(def close (run prn prn))
-(close)
-
 #_(defn >midi-messages->ch-stream
     [>midi-messages]
     (m/signal
@@ -213,10 +209,38 @@
                                   (swap! (first (get device channel)) disj data-1)))
                           :else :other))
                   (m/amb)))))))
+(defn >midi-messages->ch-stream
+  [>midi-messages]
+  (m/ap
+   (let [device (atom #{})
+         v (m/?< >midi-messages)]
+     (cond (instance? ShortMessage v)
+           (let [channel (.getChannel ^ShortMessage v)
+                 command (.getCommand ^ShortMessage v)
+                 data-1 (.getData1 ^ShortMessage v)]
+             (cond (= command ShortMessage/NOTE_ON)
+                   (swap! device conj data-1)
+                   (= command ShortMessage/NOTE_OFF)
+                   (swap! device disj data-1)))
+           :else (m/amb)))))
+
+(defn |short-messages
+  "Filter down to midi short messages"
+  [>messages]
+  (m/eduction (filter #(instance? ShortMessage %)) >messages))
+
+(defn |channels
+  [>messages]
+  (m/group-by #(.getChannel ^ShortMessage %) >messages))
 
 #_(defn >ch-stream [>device ch]
     (m/cp (m/?< (second (get >device ch)))))
 
+#_{ch {:notes {note aftertouch}
+       :pitch v
+       :control {controller value}
+       :program program}}
+
 ;; Goal:
 ;; Create function called `(receive-from-bus bus-name)`.
 ;; `bus-name` is the name of a midi bus on this machine. If a bus with that name
diff --git a/src/scratch.clj b/src/scratch.clj
new file mode 100644
index 0000000..77eb609
--- /dev/null
+++ b/src/scratch.clj
@@ -0,0 +1,36 @@
+(ns scratch
+  (:require [midi :refer [print-all-midi-devices >bus <bus] :as midi]
+            [missionary.core :as m]))
+
+#_(print-all-midi-devices)
+
+(def midi-keyboard  "CoreMIDI4J - Minilab3 MIDI")
+
+(def run
+  (<bus
+   midi-keyboard
+   #_
+   (fn [f] (m/ap
+             (let [[i] ]
+               (m/group-by #(.getCh %) ))
+             (println (m/?< f))))
+   (fn [f]
+     (m/ap
+       (let [[ch vs]
+             (m/?> 128 (midi/|channels (midi/|short-messages f)))]
+         (println "CH" ch (m/?< vs)))
+       #_
+       (let [[ch >ch-messages]
+             (m/?> 128 (midi/|channels (midi/|short-messages f)))
+             #_#_
+             [note >note-messages]
+             (m/?> 128 (midi/|notes >ch-messages))]
+         (println "CH" ch)
+         #_#_
+         (println "HELLO")
+         [ch note (m/?< >note-messages)])))))
+
+(def cancel
+  (run prn prn))
+(cancel)
+
-- 
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