feat: VST FX rack per-track + masterbus render via native_bridge

tests/test_render_engine.py

@@ -2,6 +2,7 @@ import os
 import json
 import pytest
 from app.core.render_engine import PythonRenderEngine
+import numpy as np
 
 def test_render_engine_init():
     engine = PythonRenderEngine()
@@ -87,3 +88,68 @@ def test_render_session_fx_reverb_scipy_fallback():
     assert buf.shape == (2, 44100)
     assert (buf != 0.0).any()
 
+
+_BRIDGE_TEST_PATH = r"C:/Users/locpham/SonicForgeStudio/native_bridge/build/Release/daw_vst_bridge.exe"
+
+
+def _peak(buf):
+    return float(np.max(np.abs(buf)))
+
+
+def test_render_track_fx_chain_gain_via_bridge(monkeypatch):
+    """Track fx_chain (builtin gain +6dB) qua native_bridge → biên độ x2."""
+    import numpy as np
+    if not os.path.isfile(_BRIDGE_TEST_PATH):
+        pytest.skip("bridge chưa build")
+    monkeypatch.setenv("SF_BRIDGE_PATH", _BRIDGE_TEST_PATH)
+    from app.api.v1 import plugins as pl
+    monkeypatch.setattr(pl.settings, "RENDER_ENGINE", "bridge")
+    engine = PythonRenderEngine()
+    base = _midi_track("__no_such_plugin__")
+    fx = _midi_track("__no_such_plugin__")
+    fx["vst_fx_chain"] = [{"type": "builtin", "id": "gain", "params": {"db": 6.0}}]
+    b0 = engine.render_session_container({"tracks": [base]}, {}, 120.0, 4, 44100)
+    b1 = engine.render_session_container({"tracks": [fx]}, {}, 120.0, 4, 44100)
+    assert _peak(b1) > 1.5 * _peak(b0)
+
+
+def test_render_project_master_fx_chain_gain_via_bridge(monkeypatch, tmp_path):
+    """Masterbus master.fx_chain (gain +6dB) qua native_bridge → peak x2."""
+    import numpy as np
+    if not os.path.isfile(_BRIDGE_TEST_PATH):
+        pytest.skip("bridge chưa build")
+    monkeypatch.setenv("SF_BRIDGE_PATH", _BRIDGE_TEST_PATH)
+    from app.api.v1 import plugins as pl
+    monkeypatch.setattr(pl.settings, "RENDER_ENGINE", "bridge")
+    engine = PythonRenderEngine()
+
+    def project(with_master):
+        track = _midi_track("__no_such_plugin__")
+        track["volume_db"] = -20.0  # tránh normalize (>1.0) làm hỏng tỉ lệ 2x
+        proj = {
+            "metadata": {"bpm": 120.0, "time_signature_numerator": 4},
+            "main_session": {"length_bars": 1.0, "tracks": [track]},
+            "section_store": {},
+        }
+        if with_master:
+            proj["main_session"]["master"] = {
+                "fx_chain": [{"type": "builtin", "id": "gain", "params": {"db": 6.0}}],
+                "bypass": False,
+            }
+        return proj
+
+    out0 = str(tmp_path / "no_master.wav")
+    out1 = str(tmp_path / "with_master.wav")
+    engine.render_project(project(False), out0)
+    engine.render_project(project(True), out1)
+    _, d0 = sf_read_peaks(out0)
+    _, d1 = sf_read_peaks(out1)
+    assert d1 > 1.5 * d0
+
+import soundfile as _sf
+
+def sf_read_peaks(path):
+    import numpy as np
+    data, _ = _sf.read(path, dtype="float32", always_2d=True)
+    return data, float(np.max(np.abs(data)))
+