fix: nhãn của soundfont hiển thị sai và không load được instrument

app/core/vst_engine.py

@@ -1,6 +1,7 @@
 # SonicForge Studio VST / VSTi Engine Service
 import os
 import numpy as np
+from ctypes import c_int, c_char_p, c_void_p
 
 def midi_note_to_freq(note_number: int) -> float:
     return 440.0 * (2.0 ** ((note_number - 69) / 12.0))
@@ -72,6 +73,12 @@ def check_pyfluidsynth_safe():
 HAS_PEDALBOARD = check_pedalboard_safe()
 HAS_PYFLUIDSYNTH = check_pyfluidsynth_safe()
 
+def ensure_pyfluidsynth():
+    global HAS_PYFLUIDSYNTH
+    if not HAS_PYFLUIDSYNTH:
+        HAS_PYFLUIDSYNTH = check_pyfluidsynth_safe()
+    return HAS_PYFLUIDSYNTH
+
 if HAS_PEDALBOARD:
     try:
         from pedalboard import VST3Plugin, Pedalboard, Gain, MidiMessage
@@ -165,32 +172,54 @@ class PluginManager:
             return None
 
     def list_soundfont_instruments(self, sf_id: str):
-        if not HAS_PYFLUIDSYNTH:
+        if not ensure_pyfluidsynth():
             return []
-        dirs = [self.sf_dir]
-        if self.upload_sf_dir:
-            dirs.append(self.upload_sf_dir)
-        for d in dirs:
+        search_dirs = []
+        if os.path.isdir(self.sf_dir):
+            search_dirs.append(self.sf_dir)
+        if self.upload_sf_dir and os.path.isdir(self.upload_sf_dir) and self.upload_sf_dir != self.sf_dir:
+            search_dirs.append(self.upload_sf_dir)
+        for d in search_dirs:
             for f in os.listdir(d):
+                if not (f.endswith(".sf2") or f.endswith(".sf3")):
+                    continue
                 base = os.path.splitext(f)[0]
                 if base == sf_id or base == sf_id.replace("sf_", ""):
                     path = os.path.join(d, f)
                     try:
-                        fl = fluidsynth.FluidSynth(sample_rate=44100, gain=0.2)
+                        fl = fluidsynth.Synth()
                         fid = fl.sfload(path)
-                        count = fl.sfont_get_preset_count(fid)
+                        if fid < 0:
+                            fl.delete()
+                            continue
                         presets = []
-                        for pi in range(count):
-                            try:
-                                name = fl.sfont_get_preset_name(fid, pi)
-                                bank, prog = fl.sfont_get_preset_bank_num(fid, pi), fl.sfont_get_preset_prog_num(fid, pi)
-                                presets.append({"bank": bank, "program": prog, "name": name})
-                            except Exception:
-                                pass
+                        # Use fluid_sfont_get_preset + fluid_preset_get_name C API
+                        _fl = fluidsynth._fl
+                        _fl.fluid_synth_get_sfont_by_id.restype = c_void_p
+                        _fl.fluid_preset_get_name.restype = c_char_p
+                        _fl.fluid_sfont_get_preset.restype = c_void_p
+                        sfont_ptr = _fl.fluid_synth_get_sfont_by_id(c_void_p(fl.synth), c_int(fid))
+                        if sfont_ptr:
+                            for bank in range(0, 2):
+                                for prog_num in range(0, 128):
+                                    try:
+                                        preset = fluidsynth.fluid_sfont_get_preset(sfont_ptr, c_int(bank), c_int(prog_num))
+                                    except Exception:
+                                        break
+                                    if preset:
+                                        name_ptr = fluidsynth.fluid_preset_get_name(preset)
+                                        if name_ptr:
+                                            name_val = c_char_p(name_ptr).value
+                                            if name_val:
+                                                presets.append({
+                                                    "bank": bank,
+                                                    "program": prog_num,
+                                                    "name": name_val.decode("utf-8", errors="replace")
+                                                })
                         fl.delete()
-                        return presets
+                        return presets[:256]
                     except Exception:
-                        pass
+                        import traceback; traceback.print_exc()
         return []
 
     def list_available(self) -> dict: