fix: 音量持久化(node.volume 进配置 + 开时补写) -- 根因是 filter-chain 重建后音量回 1.0 导致爆音反复; feat: 电平贝塞尔图 + Web 控制台

生成配置.py

@@ -77,6 +77,12 @@ def default_sink_name() -> str:
 _TARGET = os.environ.get("CINEMA_SPATIAL_TARGET") or default_sink_name()
 TARGET_PROP = f'node.target = "{_TARGET}"  ' if _TARGET else ""
 
+# 虚拟声卡的音量。★ 必须写进配置, 否则重建后不保留:
+# filter-chain 重建时新节点没有历史音量, 会回到 1.0 → 整链直接削波爆音。
+# 0.25 ≈ -12dB, 给电影那种高峰值因子瞬态留足余量(见 README 第 10、11 条)。
+VOLUME = os.environ.get("CINEMA_SPATIAL_VOLUME", "0.25")
+VOL_PROP = f"node.volume = {VOLUME}  " if VOLUME else ""
+
 
 def hrir_block(indent: str) -> list[str]:
     """12 个卷积器 + 6 个分发 + 左右耳混音。输入端口: cp<dir>:In"""
@@ -115,7 +121,7 @@ def sink_51() -> list[str]:
     L += ["        ]",
           '        inputs  = [ "cpFL:In" "cpFR:In" "cpFC:In" "cpLFE:In" "cpBL:In" "cpBR:In" ]',
           '        outputs = [ "mixL:Out" "mixR:Out" ]', "      }",
-          "      capture.props  = { node.name = cinema_spatial_sink  media.class = Audio/Sink  "
+          f"      capture.props  = {{ {VOL_PROP}node.name = cinema_spatial_sink  media.class = Audio/Sink  "
           "audio.channels = 6  audio.position = [ FL FR FC LFE BL BR ] }",
           f'      playback.props = {{ node.name = cinema_spatial_out  {TARGET_PROP}'
           "audio.channels = 2  audio.position = [ FL FR ] }",
@@ -165,7 +171,7 @@ def sink_upmix() -> list[str]:
     L += ["        ]",
           '        inputs  = [ "copyFL:In" "copyFR:In" ]',
           '        outputs = [ "mixL:Out" "mixR:Out" ]', "      }",
-          "      capture.props  = { node.name = cinema_spatial_up_sink  media.class = Audio/Sink  "
+          f"      capture.props  = {{ {VOL_PROP}node.name = cinema_spatial_up_sink  media.class = Audio/Sink  "
           "audio.channels = 2  audio.position = [ FL FR ] }",
           f'      playback.props = {{ node.name = cinema_spatial_up_out  {TARGET_PROP}'
           "audio.channels = 2  audio.position = [ FL FR ] }",