move engine to engine/

engine/src/channel.h

@@ -0,0 +1,78 @@
+#ifndef CHANNEL_H
+#define CHANNEL_H
+
+// cppcheck-suppress missingIncludeSystem
+#include <jack/jack.h>
+#include <stdatomic.h>
+
+#define LOOP_BUF_SIZE  (5 * 48000)
+
+#define MAX_MIDI_EVENTS 1024
+
+#define MAX_SCENES 16
+
+typedef enum {
+    CHANNEL_AUDIO,
+    CHANNEL_MIDI
+} channel_type_t;
+
+typedef struct {
+    jack_nframes_t timestamp;   /* frame offset relative to loop start */
+    unsigned char  status;
+    unsigned char  note;
+    unsigned char  velocity;
+} midi_event_t;
+
+typedef enum {
+    STATE_IDLE,
+    STATE_RECORD,
+    STATE_LOOPING,
+    STATE_PAUSED
+} looper_state;
+
+typedef struct {
+    union {
+        float         audio_buffer[LOOP_BUF_SIZE];
+        midi_event_t  midi_events[MAX_MIDI_EVENTS];
+    } loop;
+    atomic_int    loop_count;
+    atomic_int    record_pos;
+    atomic_int    playback_pos;
+    atomic_int    state;
+    atomic_int    prev_state;
+} scene_t;
+
+struct channel_t {
+    channel_type_t type;
+    atomic_int    active;
+    jack_port_t  *audio_in;
+    jack_port_t  *audio_out;
+    jack_port_t  *midi_in;
+    jack_port_t  *midi_out;
+    scene_t       scenes[MAX_SCENES];
+    atomic_int    scene_count;
+    atomic_int    current_scene;
+};
+
+/* Globals declared in looper.c */
+extern struct channel_t *_Atomic channels;
+extern atomic_int  channel_capacity;
+extern atomic_int  channel_count;
+extern int         next_channel_id;
+
+/* Safe accessor for the real‑time thread (returns a snapshot of the current pointer) */
+static inline struct channel_t *get_channels_array(void) {
+    return atomic_load(&channels);
+}
+
+void channel_add(jack_client_t *client, int idx);
+void channel_remove(jack_client_t *client, int idx);
+void channel_add_midi(jack_client_t *client, int idx);
+
+/* Scene management (called from main loop) */
+void channel_add_scene(jack_client_t *client, int idx);
+void channel_remove_scene(jack_client_t *client, int idx);
+void channel_next_scene(jack_client_t *client, int idx);
+void channel_prev_scene(jack_client_t *client, int idx);
+
+#endif