Rename plugins to external

applications/external/musictracker/tracker_engine/tracker.h

@@ -0,0 +1,38 @@
+#pragma once
+#include "tracker_notes.h"
+#include "tracker_song.h"
+
+typedef enum {
+    TrackerPositionChanged,
+    TrackerEndOfSong,
+} TrackerMessageType;
+
+typedef struct {
+    TrackerMessageType type;
+    union tracker_message_data {
+        struct {
+            uint8_t order_list_index;
+            uint8_t row;
+        } position;
+    } data;
+} TrackerMessage;
+
+typedef void (*TrackerMessageCallback)(TrackerMessage message, void* context);
+
+typedef struct Tracker Tracker;
+
+Tracker* tracker_alloc();
+
+void tracker_free(Tracker* tracker);
+
+void tracker_set_message_callback(Tracker* tracker, TrackerMessageCallback callback, void* context);
+
+void tracker_set_song(Tracker* tracker, const Song* song);
+
+void tracker_set_order_index(Tracker* tracker, uint8_t order_index);
+
+void tracker_set_row(Tracker* tracker, uint8_t row);
+
+void tracker_start(Tracker* tracker);
+
+void tracker_stop(Tracker* tracker);