FEAT: thêm nút bypass cho track strip để bypass không qua mastering panel

app/core/soundfont_converter.py

@@ -280,31 +280,37 @@ class SoundFontConverter:
     @staticmethod
     def _sf3_plays_audio(path: str) -> bool:
         """Verify a SoundFont actually loads and renders audible audio (guards
-        against shipping malformed SF3 files that silently play nothing)."""
+        against shipping malformed SF3 files that silently play nothing).
+
+        Uses the low-level CFFI binding (new_fluid_synth / write_float) — the
+        high-level Synth() class does not exist in this binding, so it is never
+        used here.
+        """
         if not os.path.exists(path):
             return False
         try:
-            import fluidsynth
+            import fluidsynth as _fs
             import numpy as np
-            fl = fluidsynth.Synth()
+            _settings = _fs.new_fluid_settings()
+            _fl = _fs.new_fluid_synth(_settings)
             try:
-                h = fl.sfload(path)
+                h = _fs.fluid_synth_sfload(_fl, path.encode("utf-8"), 1)
                 if h < 0:
                     return False
-                fl.program_select(0, h, 0, 0)
-                fl.noteon(0, 60, 100)
+                _fs.fluid_synth_program_select(_fl, 0, h, 0, 0)
+                _fs.fluid_synth_noteon(_fl, 0, 60, 100)
                 frames = 8820  # 0.2s
                 buf = np.zeros(frames * 2, dtype=np.float32)
-                fluidsynth._fl.fluid_synth_write_float(
-                    fl.synth, frames, buf.ctypes.data, 0, 1,
+                _fs.fluid_synth_write_float(
+                    _fl, frames, buf.ctypes.data, 0, 1,
                     buf.ctypes.data + frames * 4, 0, 1
                 )
-                fl.noteoff(0, 60)
+                _fs.fluid_synth_noteoff(_fl, 0, 60)
                 rms = float(np.sqrt(np.mean(buf ** 2)))
                 return rms > 1e-4
             finally:
                 try:
-                    fl.delete()
+                    _fs.delete_fluid_synth(_fl)
                 except Exception:
                     pass
         except Exception: