shazam2mqtt 0.1.1a2

Shazam-to-MQTT bridge with Home Assistant auto-discovery

shazam2mqtt

Because vinyl, tapes, and CDs don't have an API.

shazam2mqtt is a Dockerised bridge that listens to your room, recognises whatever music is playing via Shazam, and publishes the result to MQTT — including Home Assistant auto-discovery.

Why shazam2mqtt?

Streaming services expose what you're playing natively. Physical media doesn't.

If you consume music on:

• Vinyl
• Cassette tapes
• CDs
• Radio
• ...or anything else that doesn't have a Spotify API endpoint

...then Home Assistant has no idea what's spinning. shazam2mqtt fixes that by placing a microphone near your speakers, fingerprinting the audio with Shazam, and pushing the track metadata straight into HA.

Your dashboard can now show:

• What's currently playing
• The artist and track name
• Album artwork (Picture Entity card)
• A link to the song on Apple Music, Spotify, Deezer
• Lyrics, release metadata, and related videos
• Whether the room is silent or loud

What it does

1. Noise-gated listening — continuously monitors ambient audio using an RMS threshold (NOISE_GATE_DB).
2. Smart capture — once audio is sustained for ~3 s, it records a 10-second clip.
3. Shazam identification — fingerprints the clip via xazam + shazamio_core.
4. MQTT publishing — pushes the track title, artist, and metadata to MQTT topics.
5. Home Assistant discovery — automatically registers 9 entities under one device (Now Playing, Artist, Track, Confidence, Matched, Status, Noise Level, Apple Music URL, Artwork URL) via the MQTT integration.
6. Rich JSON attributes — the Now Playing sensor carries lyrics, genres, Spotify/Deezer links, album metadata, and related YouTube videos as attributes.

Quick Start (Docker Compose)

1. Clone / copy this directory.
2. Create a .env file (or export variables):

DEVICE_NAME=living_room
MQTT_HOST=192.168.1.200
MQTT_USER=mqtt
MQTT_PASS=secret
NOISE_GATE_DB=-40
LISTEN_DURATION=10
COOLDOWN_SECONDS=60
SAME_SONG_COOLDOWN_SECONDS=300

3. Run:

docker compose up --build

Home Assistant will auto-discover the device under Settings → Devices & Services → MQTT.

Environment Variables

Variable	Default	Description
DEVICE_NAME	shazam	Prefix for the HA entity ID (living_room_shazam_now_playing)
MQTT_HOST	localhost	MQTT broker host
MQTT_PORT	1883	MQTT broker port
MQTT_USER	(none)	MQTT username
MQTT_PASS	(none)	MQTT password
NOISE_GATE_DB	-40	dBFS threshold. Audio quieter than this is considered silence.
LISTEN_DURATION	10	Seconds of audio to capture for Shazam recognition
COOLDOWN_SECONDS	60	Minimum seconds between recognition attempts
SAME_SONG_COOLDOWN_SECONDS	300	Extra cooldown if the same song repeats
HA_DISCOVERY_PREFIX	homeassistant	Home Assistant MQTT discovery prefix
HA_ENABLED	true	Set to false to disable HA discovery messages

Architecture

Mic ──► Noise Gate (RMS) ──► 10 s Capture ──► Shazam API ──► MQTT ──► Home Assistant
                    │
                    └── "listen_now" command from HA

• Idle loop reads 1-second audio chunks and checks RMS energy.
• Trigger requires 3 consecutive "loud" chunks (~3 s hysteresis) to avoid reacting to pops.
• State machine prevents overlapping captures and rate-limits the Shazam API.
• Command topic shazam2mqtt/<device_name>/command accepts listen_now for manual triggers.

MQTT Topics

Topic	Type	Payload example
shazam2mqtt/<name>/now_playing	state	Nothing Else Matters — Metallica
shazam2mqtt/<name>/status	status	playing / unknown / silence
shazam2mqtt/<name>/matched	binary	ON / OFF
shazam2mqtt/<name>/track	sensor	Nothing Else Matters
shazam2mqtt/<name>/artist	sensor	Metallica
shazam2mqtt/<name>/confidence	sensor	4
shazam2mqtt/<name>/apple_music_url	sensor	https://music.apple.com/...
shazam2mqtt/<name>/artwork_url	sensor	https://is1-ssl.mzstatic.com/...
shazam2mqtt/<name>/noise_level	sensor	-40.0
shazam2mqtt/<name>/command	command in	listen_now

Audio Backends

ALSA (default)

The docker-compose.yml passes /dev/snd into the container. This works on most headless Linux hosts.

PulseAudio / PipeWire

If your host uses PulseAudio, comment out the devices: block and uncomment the volumes: and PULSE_SERVER lines in docker-compose.yml.

Non-Docker Usage

pip install -e .
export DEVICE_NAME=my_room
export MQTT_HOST=192.168.1.200
python -m shazam2mqtt

Troubleshooting

• "No audio device found" — make sure the container has access to /dev/snd or the PulseAudio socket.
• "No matches" constantly — lower NOISE_GATE_DB (e.g. -50) or move the mic closer to the speakers.
• Entity not appearing in HA — check that the MQTT integration is enabled in Home Assistant and that HA_ENABLED=true.

License

MIT