fix&feat: hiển thị tools chỉnh sửa audioclip

tests/test_sub_tab_dsp.py

@@ -42,3 +42,39 @@ def test_merge_back_to_parent():
     assert np.allclose(res[:900], 1.0)
     # Inside the edited range should be zero (except crossfades)
     assert np.allclose(res[1100:2900], 0.0)
+
+def test_apply_volume_automation_envelope():
+    sr = 44100
+    duration = 2.0
+    y = np.ones(int(sr * duration), dtype=np.float32) * 0.5  # Constant signal at -6dB
+
+    # Simple fade in from -inf to 0dB over 1 second
+    nodes = [
+        {"time": 0.0, "db": -60.0}, # Effectively -inf
+        {"time": 1.0, "db": 0.0},
+        {"time": 2.0, "db": 0.0},
+    ]
+    
+    y_automated = SubTabDSPEngine.apply_volume_automation_envelope(y, sr, nodes)
+
+    y_automated = SubTabDSPEngine.apply_volume_automation_envelope(y, sr, nodes)
+
+    # Check start: should be 0.5 * 10**(-30/20) due to clipping
+    expected_start_val = 0.5 * (10**(-30/20.0))
+    assert np.isclose(y_automated[0], expected_start_val, atol=1e-5)
+    
+    # Check at 0.5 seconds: interpolated to -15dB (halfway between -30dB and 0dB)
+    # y * (10 ** (-15 / 20))
+    expected_mid_val = 0.5 * (10**(-15/20.0))
+    assert np.isclose(y_automated[int(0.5 * sr)], expected_mid_val, atol=1e-5)
+
+    # Check at 1.0 seconds: should be 0.5 * (10**(0/20)) = 0.5
+    assert np.isclose(y_automated[int(1.0 * sr)], 0.5, atol=1e-5)
+
+    # Check at end: should be 0.5
+    assert np.isclose(y_automated[-1], 0.5, atol=1e-5)
+
+    # Test with empty nodes
+    y_no_nodes = SubTabDSPEngine.apply_volume_automation_envelope(y, sr, [])
+    assert np.array_equal(y_no_nodes, y)
+