feat: add mock JACK test target and unit tests for carla host

engine/src/channel.c

@@ -95,18 +95,18 @@ void channel_remove_scene(jack_client_t *client, int idx) {
     /* shift remaining scenes down (atomic copy of fields) */
     for (int i = cs; i < sc - 1; i++) {
         atomic_store(&cur[idx].scenes[i].loop_count,
-                 atomic_load(&cur[idx].scenes[i + 1].loop_count));
+                     atomic_load(&cur[idx].scenes[i+1].loop_count));
         atomic_store(&cur[idx].scenes[i].record_pos,
-                 atomic_load(&cur[idx].scenes[i + 1].record_pos));
+                     atomic_load(&cur[idx].scenes[i+1].record_pos));
         atomic_store(&cur[idx].scenes[i].playback_pos,
-                 atomic_load(&cur[idx].scenes[i + 1].playback_pos));
+                     atomic_load(&cur[idx].scenes[i+1].playback_pos));
         atomic_store(&cur[idx].scenes[i].state,
-                 atomic_load(&cur[idx].scenes[i + 1].state));
+                     atomic_load(&cur[idx].scenes[i+1].state));
         atomic_store(&cur[idx].scenes[i].prev_state,
-                 atomic_load(&cur[idx].scenes[i + 1].prev_state));
+                     atomic_load(&cur[idx].scenes[i+1].prev_state));
         /* copy loop data (may race with RT thread; acceptable for this release) */
         memcpy(cur[idx].scenes[i].loop.audio_buffer,
-           cur[idx].scenes[i + 1].loop.audio_buffer,
+               cur[idx].scenes[i+1].loop.audio_buffer,
                LOOP_BUF_SIZE * sizeof(float));
     }
     atomic_fetch_sub(&cur[idx].scene_count, 1);

engine/src/looper.c

@@ -4,16 +4,16 @@
 #include "command.h"
 #include "midi.h"
 #include "queue.h"
-#include <fcntl.h>
 #include <jack/jack.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
 #include <jack/midiport.h>
 #include <math.h>
 #include <stdatomic.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/stat.h>
-#include <unistd.h>
 
 #define STATUS_FIFO "/tmp/looper_status"
 
@@ -31,23 +31,15 @@ static void looper_write_status(void) {
         int state = atomic_load(&cur[ch].scenes[sc_idx].state);
         const char *state_str;
         switch (state) {
-    case STATE_IDLE:
-      state_str = "IDLE";
-      break;
-    case STATE_RECORD:
-      state_str = "RECORD";
-      break;
-    case STATE_LOOPING:
-      state_str = "LOOPING";
-      break;
-    case STATE_PAUSED:
-      state_str = "PAUSED";
-      break;
-    default:
-      state_str = "UNKNOWN";
+            case STATE_IDLE:    state_str = "IDLE";    break;
+            case STATE_RECORD:  state_str = "RECORD";  break;
+            case STATE_LOOPING: state_str = "LOOPING"; break;
+            case STATE_PAUSED:  state_str = "PAUSED";  break;
+            default:            state_str = "UNKNOWN";
         }
-    int n = snprintf(buf, sizeof(buf), "CH=%d SC=%d STATE=%s\n", ch, sc_idx,
-                     state_str);
+        int n = snprintf(buf, sizeof(buf),
+                         "CH=%d SC=%d STATE=%s\n",
+                         ch, sc_idx, state_str);
         if (n > 0) {
             int ret = write(fd, buf, n);
             (void)ret;
@@ -260,7 +252,8 @@ int process_callback(jack_nframes_t nframes, void *arg) {
             if (rp < MAX_MIDI_EVENTS) {
               sc->loop.midi_events[rp].timestamp = ev.time;
               sc->loop.midi_events[rp].status = ev.buffer[0];
-              sc->loop.midi_events[rp].note = (ev.size > 1) ? ev.buffer[1] : 0;
+              sc->loop.midi_events[rp].note =
+                  (ev.size > 1) ? ev.buffer[1] : 0;
               sc->loop.midi_events[rp].velocity =
                   (ev.size > 2) ? ev.buffer[2] : 0;
               atomic_store(&sc->record_pos, rp + 1);
@@ -317,7 +310,8 @@ int process_callback(jack_nframes_t nframes, void *arg) {
               jack_midi_event_write(midi_out_buf, ev.time, ev.buffer, ev.size);
             }
           }
-      } break;
+        }
+        break;
       }
       if (state == STATE_LOOPING) {
         atomic_store(&sc->loop_count, atomic_load(&sc->record_pos));

engine/src/midi.c

@@ -82,7 +82,8 @@ void midi_handle_events(void *port_buffer, jack_nframes_t nframes) {
               queue_push(&cmd_queue_main_midi, cmd);
             } break;
             case 69: {
-              command_t cmd = {.type = CMD_ADD_SCENE, .channel = -1, .data = 0};
+              command_t cmd = {
+                  .type = CMD_ADD_SCENE, .channel = -1, .data = 0};
               queue_push(&cmd_queue_main_midi, cmd);
             } break;
             case 70: {

engine/src/pipe.c

@@ -7,8 +7,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/stat.h>
 #include <time.h>
+#include <sys/stat.h>
 #include <unistd.h>
 
 #define FIFO_PATH "/tmp/looper_cmd"
@@ -39,8 +39,7 @@ static void *pipe_thread_func(void *arg) {
         command_t cmd = {.type = CMD_ADD_CHANNEL, .channel = -1, .data = 0};
         queue_push(&cmd_queue_main_fifo, cmd);
       } else if (strcmp(line, "add_midi") == 0) {
-        command_t cmd = {
-            .type = CMD_ADD_MIDI_CHANNEL, .channel = -1, .data = 0};
+        command_t cmd = {.type = CMD_ADD_MIDI_CHANNEL, .channel = -1, .data = 0};
         queue_push(&cmd_queue_main_fifo, cmd);
       } else if (strcmp(line, "remove") == 0) {
         command_t cmd = {.type = CMD_REMOVE_CHANNEL, .channel = -1, .data = 0};