Initial Commit

lufs_mqtt.py

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+import time
+import numpy as np
+import sounddevice as sd
+import pyloudnorm as pyln
+import paho.mqtt.client as mqtt
+
+# MQTT
+MQTT_HOST = "10.40.0.2"
+MQTT_PORT = 1883
+
+TOPIC_M = "stream/audio/lufs/momentary"
+TOPIC_S = "stream/audio/lufs/shortterm"
+TOPIC_I = "stream/audio/lufs/integrated"
+DEVICE = "default"
+
+# Audio
+RATE = 48000
+CHANNELS = 2
+
+def find_scarlett():
+    for i, d in enumerate(sd.query_devices()):
+        name = d["name"].lower()
+        if "scarlett" in name and d["max_input_channels"] >= 2:
+            return i
+    raise RuntimeError("Scarlett stereo input not found")
+
+# Windows
+M_WINDOW = 0.4
+S_WINDOW = 3.0
+UPDATE = 0.25
+
+meter = pyln.Meter(RATE)
+
+integrated_buffer = np.array([], dtype=np.float32)
+shortterm_buffer = np.array([], dtype=np.float32)
+
+RESET_TOPIC = "stream/audio/lufs/reset"
+
+reset_requested = False
+
+
+def on_message(client, userdata, msg):
+    global reset_requested
+
+    if msg.topic == RESET_TOPIC:
+        print("Resetting integrated LUFS")
+        reset_requested = True
+
+client = mqtt.Client()
+
+client.on_message = on_message
+
+client.connect(MQTT_HOST, MQTT_PORT)
+
+client.subscribe(RESET_TOPIC)
+
+client.loop_start()
+
+print("LUFS → MQTT running")
+
+while True:
+
+    try:
+        samples = sd.rec(
+            int(UPDATE * RATE),
+            samplerate=RATE,
+            channels=CHANNELS,
+            device=DEVICE,
+            dtype="float32",
+        )
+        sd.wait()
+
+    except Exception as e:
+        print(f"Audio route changed / device unavailable: {e}")
+        time.sleep(2)
+        continue
+
+    mono = samples.flatten()
+
+    if reset_requested:
+        integrated_buffer = np.array([], dtype=np.float32)
+        reset_requested = False
+
+    integrated_buffer = np.concatenate(
+        [integrated_buffer, mono]
+    )[-RATE * 60 * 120:]
+
+    shortterm_buffer = np.concatenate(
+        [shortterm_buffer, mono]
+    )[-int(S_WINDOW * RATE):]
+
+    try:
+
+        m_samples = shortterm_buffer[
+            -int(M_WINDOW * RATE):
+        ]
+
+        momentary = meter.integrated_loudness(
+            m_samples
+        )
+
+        shortterm = meter.integrated_loudness(
+            shortterm_buffer
+        )
+
+        integrated = meter.integrated_loudness(
+            integrated_buffer
+        )
+
+        client.publish(
+            TOPIC_M,
+            f"{momentary:.1f}",
+            retain=True
+        )
+
+        client.publish(
+            TOPIC_S,
+            f"{shortterm:.1f}",
+            retain=True
+        )
+
+        client.publish(
+            TOPIC_I,
+            f"{integrated:.1f}",
+            retain=True
+        )
+
+        print(
+            f"\rM {momentary:.1f} "
+            f"S {shortterm:.1f} "
+            f"I {integrated:.1f}",
+            end=""
+        )
+
+    except Exception:
+        pass

readme.md

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+# LUFS MQTT Viewer
+
+A simple script to broadcast a sound sources LUFS over MQTT

requirements.txt

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+cffi==2.0.0
+numpy==2.4.6
+paho-mqtt==2.1.0
+pycparser==3.0
+pyloudnorm==0.2.0
+scipy==1.17.1
+sounddevice==0.5.5