T16: autosample VST2 via native bridge + SF2/SF3 export hoàn chỉnh, UI chip size/note_count, re-sample on preset change, tests

app/core/native_audio_service.py

@@ -445,8 +445,10 @@ class NativeAudioService:
 
     def render_vst2_offline(self, plugin_path, notes, bpm=120.0, sr=44100,
                             gain_db=0.0, pan=0.0, lim_active=False,
-                            threshold_db=-1.0, master_gain_db=0.0):
-        """Offline VST2: SF_VST2_Process (raw) + mixer_math (Python mirror)."""
+                            threshold_db=-1.0, master_gain_db=0.0, tail_sec=0.5):
+        """Offline VST2: SF_VST2_Process (raw) + mixer_math (Python mirror).
+
+        tail_sec: duoi im lang sau note cuoi (autosample muon release tail)."""
         with _LOCK:
             dll = self._load_vst2_dll()
             ctx = _Vst2Ctx(dll)
@@ -466,7 +468,7 @@ class NativeAudioService:
                     events.append((int((start_s + dur_s) * sr), "off", pitch, 0))
                     total = max(total, start_s + dur_s)
                 events.sort(key=lambda e: e[0])
-                n = int((max(total, 0.25) + 0.5) * sr)
+                n = int((max(total, 0.25) + float(tail_sec)) * sr)
                 out = np.zeros((2, n), dtype=np.float32)
                 block = 256
                 pos = 0

app/core/soundfont_converter.py

@@ -5,6 +5,27 @@ import logging
 import wave
 
 logger = logging.getLogger(__name__)
+def _ensure_fluidsynth_runtime() -> None:
+    """Dua thu muc chua libfluidsynth DLL vao PATH de pyfluidsynth import duoc
+    (find_library do theo PATH tren Windows). Khong lam gi tren non-Windows."""
+    if os.name != "nt":
+        return
+    root = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+    candidates = [
+        os.path.join(root, "native_host", "build", "Release", "fluidsynth_runtime"),
+        os.path.join(root, "native_host", "fluidsynth_runtime"),
+    ]
+    path = os.environ.get("PATH", "")
+    parts = [os.path.normcase(p) for p in path.split(os.pathsep)]
+    for d in candidates:
+        if os.path.isdir(d) and any(
+            f.lower().startswith("libfluidsynth") and f.lower().endswith(".dll")
+            for f in os.listdir(d)
+        ):
+            if os.path.normcase(d) not in parts:
+                os.environ["PATH"] = d + os.pathsep + path
+            return
+
 
 SF_TARGET_DIRS = [
     "/opt/daw_engine/soundfonts",
@@ -193,8 +214,8 @@ class SoundFontConverter:
                 # OGG loop pointers are relative to the individual decompressed sample
                 new_sloop = (startloop - start) if (startloop > start and startloop <= end) else 0
                 new_eloop = (endloop - start) if (endloop > start and endloop <= end) else 0
-                # Mark the sample as Ogg Vorbis compressed (FLUID_SAMPLETYPE_OGG_VORBIS = 0x20)
-                new_stype = sampletype | 0x20
+                # Mark the sample as Ogg Vorbis compressed (FLUID_SAMPLETYPE_OGG_VORBIS = 0x10)
+                new_stype = sampletype | 0x10
                 new_shdr += data[base:base + 20]                       # sample name
                 new_shdr += struct.pack("<IIIIi", new_start, new_end, new_sloop, new_eloop, rate)
                 new_shdr += data[base + 40:base + 44]                  # originalpitch, correction, samplelink
@@ -282,35 +303,28 @@ class SoundFontConverter:
         """Verify a SoundFont actually loads and renders audible audio (guards
         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.
+        Uses the high-level Synth() binding (sfload/get_samples).
         """
         if not os.path.exists(path):
             return False
+        _ensure_fluidsynth_runtime()
         try:
             import fluidsynth as _fs
             import numpy as np
-            _settings = _fs.new_fluid_settings()
-            _fl = _fs.new_fluid_synth(_settings)
+            _synth = _fs.Synth()
             try:
-                h = _fs.fluid_synth_sfload(_fl, path.encode("utf-8"), 1)
-                if h < 0:
+                fid = _synth.sfload(path)
+                if fid == -1:
                     return False
-                _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)
-                _fs.fluid_synth_write_float(
-                    _fl, frames, buf.ctypes.data, 0, 1,
-                    buf.ctypes.data + frames * 4, 0, 1
-                )
-                _fs.fluid_synth_noteoff(_fl, 0, 60)
-                rms = float(np.sqrt(np.mean(buf ** 2)))
+                _synth.program_select(0, fid, 0, 0)
+                _synth.noteon(0, 60, 100)
+                buf = _synth.get_samples(8820)  # int16 stereo, 0.2s
+                _synth.noteoff(0, 60)
+                rms = float(np.sqrt(np.mean((buf.astype(np.float32) / 32768.0) ** 2)))
                 return rms > 1e-4
             finally:
                 try:
-                    _fs.delete_fluid_synth(_fl)
+                    _synth.delete()
                 except Exception:
                     pass
         except Exception:
@@ -453,7 +467,7 @@ class SoundFontConverter:
                 new_loopstart = loopstart + new_start if (loopstart or loopend) else 0
                 new_loopend = loopend + new_start if (loopstart or loopend) else 0
                 # Clear the Ogg Vorbis flag; keep mono/left/right/linked flags
-                new_stype = sampletype & ~0x20
+                new_stype = sampletype & ~0x10
                 new_shdr += name
                 new_shdr += struct.pack("<IIIIi", new_start, new_end, new_loopstart, new_loopend, rate)
                 new_shdr += data[base + 40:base + 44]