levels example added

examples/levels/__main__.py

@@ -0,0 +1,43 @@
+from enum import IntEnum
+from math import log
+
+import obsws_python as obs
+
+LEVELTYPE = IntEnum(
+    "LEVELTYPE",
+    "VU POSTFADER PREFADER",
+    start=0,
+)
+
+
+def on_input_mute_state_changed(data):
+    """The current program scene has changed."""
+    print(f"{data.input_name} mute toggled")
+
+
+def on_input_volume_meters(data):
+    def fget(x):
+        return round(20 * log(x, 10), 1) if x > 0 else -200.0
+
+    for device in data.inputs:
+        name = device["inputName"]
+        if name == INPUT_DEVICE and device["inputLevelsMul"]:
+            left, right = device["inputLevelsMul"]
+            print(
+                f"{name} [L: {fget(left[LEVELTYPE.POSTFADER])}, R: {fget(right[LEVELTYPE.POSTFADER])}]",
+            )
+
+
+def main():
+    client = obs.EventClient(subs=(obs.Subs.LOW_VOLUME | obs.Subs.INPUTVOLUMEMETERS))
+    client.callback.register([on_input_volume_meters, on_input_mute_state_changed])
+
+    while cmd := input("<Enter> to exit>\n"):
+        if not cmd:
+            break
+
+
+if __name__ == "__main__":
+    INPUT_DEVICE = "Desktop Audio"
+
+    main()