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diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..4ba763d
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,23 @@
+[tool.poetry]
+name = "turntable"
+version = "0.1.0"
+description = "Turntable audio monitoring"
+authors = ["Correl Roush <correl@gmail.com>"]
+license = "MIT"
+
+[tool.poetry.dependencies]
+python = "^3.8"
+pyalsaaudio = "^0.9.0"
+pydejavu = {git = "https://github.com/worldveil/dejavu.git"}
+requests = "^2.24.0"
+
+[tool.poetry.dev-dependencies]
+black = "^20.8b1"
+mypy = "^0.782"
+
+[tool.poetry.scripts]
+turntable = "turntable.cli:main"
+
+[build-system]
+requires = ["poetry>=0.12"]
+build-backend = "poetry.masonry.api"
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/turntable/__init__.py b/turntable/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/turntable/audio.py b/turntable/audio.py
new file mode 100644
index 0000000..31ef7fd
--- /dev/null
+++ b/turntable/audio.py
@@ -0,0 +1,62 @@
+from collections import deque
+import logging
+import math
+from multiprocessing import Process, Queue
+from multiprocessing.connection import Connection
+from typing import Deque, List, Tuple, Union
+
+import alsaaudio  # type: ignore
+
+from turntable.models import PCM
+
+logger = logging.getLogger(__name__)
+
+
+class Listener(Process):
+    def __init__(
+        self,
+        pcm_in: "Queue[PCM]",
+        device: str,
+        sample_length: int = 30,
+        framerate: int = 44100,
+        channels: int = 2,
+        period_size: int = 1024,
+    ) -> None:
+        super().__init__()
+        logger.info("Initializing Listener")
+        self.pcm_in = pcm_in
+        self.framerate = framerate
+        self.channels = channels
+        self.capture = alsaaudio.PCM(
+            device=device,
+            type=alsaaudio.PCM_CAPTURE,
+            format=alsaaudio.PCM_FORMAT_S16_LE,
+            periodsize=period_size,
+            rate=framerate,
+            channels=channels,
+        )
+        available_channels: List[int] = self.capture.getchannels()
+        available_rates: Union[int, Tuple[int, int]] = self.capture.getrates()
+        if channels not in available_channels:
+            raise ValueError(f"Unsupported channel count: {channels}")
+        if isinstance(available_rates, int):
+            framerate = available_rates
+        elif framerate not in range(*available_rates):
+            raise ValueError(f"Unsupported framerate: {framerate}")
+        logger.info(
+            "Listener started on '%s' [rate=%d, channels=%d, periodsize=%d]",
+            device,
+            framerate,
+            channels,
+            period_size,
+        )
+
+    def run(self) -> None:
+        while True:
+            length, data = self.capture.read()
+            if length > 0:
+                self.pcm_in.put(PCM(self.framerate, self.channels, data))
+            else:
+                logger.warning(
+                    "Sampler error (length={}, bytes={})".format(length, len(data))
+                )
diff --git a/turntable/cli.py b/turntable/cli.py
new file mode 100644
index 0000000..52bf19c
--- /dev/null
+++ b/turntable/cli.py
@@ -0,0 +1,79 @@
+import argparse
+import importlib.metadata
+import json
+import logging
+from multiprocessing import Queue
+import os
+from typing import Any, Dict
+
+from dejavu import Dejavu  # type: ignore
+
+from turntable.audio import Listener
+from turntable.icecast import Icecast
+from turntable.models import PCM
+from turntable.turntable import (
+    Event,
+    NewMetadata,
+    StartedPlaying,
+    StoppedPlaying,
+    Turntable,
+)
+
+VERSION = importlib.metadata.version("turntable")
+
+
+def main() -> None:
+    logging.basicConfig(level=logging.INFO)
+    print(f"Turntable {VERSION}")
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--config", default=os.path.expanduser("~/.config/turntable.json")
+    )
+    args = parser.parse_args()
+    with open(args.config, "r") as config_file:
+        config: Dict[str, Any] = json.load(config_file)
+
+    pcm_in: "Queue[PCM]" = Queue()
+    events: "Queue[Event]" = Queue()
+
+    audio_config = config.get("audio", dict())
+    listener = Listener(
+        pcm_in,
+        audio_config.get("device", "default"),
+        framerate=audio_config.get("framerate", 44100),
+        channels=audio_config.get("channels", 2),
+        period_size=audio_config.get("period_size", 4096),
+    )
+
+    dejavu = Dejavu(config.get("dejavu", dict()))
+
+    player = Turntable(listener.framerate, listener.channels, dejavu, pcm_in, events)
+
+    icecast_config = config.get("icecast", dict())
+    icecast = Icecast(
+        host=icecast_config.get("host", "localhost"),
+        port=icecast_config.get("port", 8000),
+        mountpoint=icecast_config.get("mountpoint", "stream.mp3"),
+        user=icecast_config.get("admin_user", "admin"),
+        password=icecast_config.get("admin_password", "hackme"),
+    )
+
+    processes = [listener, player]
+    for process in processes:
+        process.daemon = True
+        process.start()
+    try:
+        icecast.set_title("<Idle>")
+        while event := events.get():
+            logging.info("Event: %s", event)
+            if isinstance(event, StartedPlaying):
+                icecast.set_title("<Record starting...>")
+            elif isinstance(event, StoppedPlaying):
+                icecast.set_title("<Idle>")
+            elif isinstance(event, NewMetadata):
+                icecast.set_title(event.title)
+    except KeyboardInterrupt:
+        for process in processes:
+            if process.is_alive():
+                process.terminate()
diff --git a/turntable/icecast.py b/turntable/icecast.py
new file mode 100644
index 0000000..203dc64
--- /dev/null
+++ b/turntable/icecast.py
@@ -0,0 +1,28 @@
+import logging
+import os
+
+import requests
+
+logger = logging.getLogger(__name__)
+
+
+class Icecast:
+    def __init__(self, host: str, port: int, mountpoint: str, user: str, password: str):
+        self.host = host
+        self.port = port
+        self.mountpoint = mountpoint
+        self.credentials = (user, password)
+
+    def set_title(self, title: str):
+        try:
+            requests.get(
+                f"http://{self.host}:{self.port}/admin/metadata",
+                params={
+                    "mount": os.path.join("/", self.mountpoint),
+                    "mode": "updinfo",
+                    "song": title,
+                },
+                auth=self.credentials,
+            )
+        except requests.RequestException as e:
+            logger.warning("Failed to update icecast metadata: %s", e)
diff --git a/turntable/models.py b/turntable/models.py
new file mode 100644
index 0000000..d954281
--- /dev/null
+++ b/turntable/models.py
@@ -0,0 +1,49 @@
+from collections import deque
+from dataclasses import dataclass
+from typing import Deque, Iterable, Optional, Union
+
+
+class PCM:
+    """16-bit raw PCM audio."""
+
+    def __init__(
+        self,
+        framerate: int,
+        channels: int,
+        data: bytes = b"",
+        maxlen: Optional[int] = None,
+    ):
+        self.framerate = framerate
+        self.channels = channels
+        self._data: Deque[int] = deque(data, maxlen)
+
+    @property
+    def raw(self):
+        return bytes(self._data)
+
+    @property
+    def framesize(self):
+        # Two bytes for each channel
+        return self.channels * 2
+
+    def __getitem__(self, key: Union[int, slice]) -> "PCM":
+        """Address raw data by frame."""
+        if isinstance(key, int):
+            start = key * self.framesize
+            stop = start + self.framesize
+            return PCM(self.framerate, self.channels, self.raw[start:stop])
+        else:
+            start = key.start * self.framesize if key.start is not None else None
+            stop = key.stop * self.framesize if key.stop is not None else None
+            step = key.step * self.framesize if key.step is not None else None
+            return PCM(self.framerate, self.channels, self.raw[start:stop:step])
+
+    def __iter__(self) -> "Iterable[PCM]":
+        """Iterate over raw data by frame."""
+        for i in range(0, len(self._data), self.framesize):
+            yield PCM(self.framerate, self.channels, self.raw[i : i + self.framesize])
+
+    def append(self, other: "PCM") -> None:
+        if other.framerate != self.framerate or other.channels != self.channels:
+            raise ValueError("Cannot append incompatible PCM audio")
+        self._data.extend(other._data)
diff --git a/turntable/turntable.py b/turntable/turntable.py
new file mode 100644
index 0000000..ba72417
--- /dev/null
+++ b/turntable/turntable.py
@@ -0,0 +1,166 @@
+import audioop
+from dataclasses import dataclass
+import enum
+import logging
+from multiprocessing import Process, Queue
+from multiprocessing.connection import Connection
+import struct
+import time
+from typing import Any, Callable, Dict, Iterable, List, Optional, Set, Tuple
+import wave
+
+from dejavu import Dejavu  # type: ignore
+from dejavu.base_classes.base_recognizer import BaseRecognizer  # type: ignore
+import dejavu.config.settings  # type: ignore
+
+
+from turntable.models import PCM
+
+logger = logging.getLogger(__name__)
+
+
+FINGERPRINT_IDENTIFY_SECONDS = 5
+FINGERPRINT_STORE_SECONDS = 30
+SAMPLE_SECONDS = 30
+SILENCE_THRESHOLD = 100
+STOP_DELAY = 5
+
+
+class State(enum.Enum):
+    idle = "idle"
+    playing = "playing"
+    silent = "silent"
+
+
+class Event:
+    @property
+    def type(self) -> str:
+        return self.__class__.__name__
+
+    def __repr__(self) -> str:
+        return f"<{self.type}>"
+
+
+class StartedPlaying(Event):
+    ...
+
+
+class StoppedPlaying(Event):
+    ...
+
+
+@dataclass
+class NewMetadata(Event):
+    title: str
+
+
+class PCMRecognizer(BaseRecognizer):
+    def pcm_to_channel_data(self, pcm: PCM) -> List[List[int]]:
+        def to_ints(data: bytes) -> List[int]:
+            return list(struct.unpack("{}h".format(len(data) // 2), data))
+
+        stream = to_ints(pcm.raw)
+        return [stream[channel :: pcm.channels] for channel in range(pcm.channels)]
+
+    def recognize(self, pcm: PCM) -> Dict[str, Any]:
+        data = self.pcm_to_channel_data(pcm)
+        t = time.time()
+        matches, fingerprint_time, query_time, align_time = self._recognize(*data)
+        t = time.time() - t
+        return {
+            dejavu.config.settings.TOTAL_TIME: t,
+            dejavu.config.settings.FINGERPRINT_TIME: fingerprint_time,
+            dejavu.config.settings.QUERY_TIME: query_time,
+            dejavu.config.settings.ALIGN_TIME: align_time,
+            dejavu.config.settings.RESULTS: matches,
+        }
+
+
+class Turntable(Process):
+    def __init__(
+        self,
+        framerate: int,
+        channels: int,
+        dejavu: Dejavu,
+        pcm_in: "Queue[PCM]",
+        events_out: "Queue[Event]",
+    ) -> None:
+        super().__init__()
+        maxlen = channels * 2 * framerate * SAMPLE_SECONDS
+        self.buffer = PCM(framerate=framerate, channels=channels, maxlen=maxlen)
+        self.recognizer = PCMRecognizer(dejavu)
+        self.pcm_in = pcm_in
+        self.events_out = events_out
+        self.state: State = State.idle
+        self.identified = False
+        self.captured = False
+        self.last_update: float = time.time()
+
+    def run(self) -> None:
+        logger.info("Initializing Turntable")
+        while fragment := self.pcm_in.get():
+            self.buffer.append(fragment)
+            maximum = audioop.max(fragment.raw, 2)
+            self.update_audiolevel(maximum)
+
+    def update_audiolevel(self, level: int):
+        newstate = self.state
+        now = time.time()
+        if self.state == State.idle:
+            # Transition to playing if there's sufficient audio.
+            if level > SILENCE_THRESHOLD:
+                self.transition(State.playing, now)
+        elif self.state == State.playing:
+            # Transition to silent when the audio drops out.
+            if level <= SILENCE_THRESHOLD:
+                self.transition(State.silent, now)
+            elif (
+                now - self.last_update >= FINGERPRINT_IDENTIFY_SECONDS
+                and self.identified == False
+            ):
+                sample = self.buffer[
+                    0 : self.buffer.framerate * FINGERPRINT_IDENTIFY_SECONDS
+                ]
+                identification = self.recognizer.recognize(sample)
+                logger.debug("Dejavu results: %s", identification)
+                if results := identification[dejavu.config.settings.RESULTS]:
+                    self.events_out.put(
+                        NewMetadata(
+                            results[0][dejavu.config.settings.SONG_NAME].decode("utf-8")
+                        )
+                    )
+                self.identified = True
+            elif (
+                now - self.last_update >= FINGERPRINT_STORE_SECONDS
+                and self.captured == False
+            ):
+                sample = self.buffer[
+                    0 : self.buffer.framerate * FINGERPRINT_STORE_SECONDS
+                ]
+                with wave.open("/tmp/fingerprint.wav", "wb") as wavfile:
+                    wavfile.setsampwidth(2)
+                    wavfile.setnchannels(sample.channels)
+                    wavfile.setframerate(sample.framerate)
+                    wavfile.writeframesraw(sample.raw)
+                logger.info("Captured waveform for fingerprinting")
+                self.captured = True
+
+        elif self.state == State.silent:
+            # Transition back to playing if audio returns within STOP_DELAY
+            # seconds, otherwise transition to idle.
+            if level > SILENCE_THRESHOLD:
+                self.transition(State.playing, now)
+            elif now - self.last_update >= STOP_DELAY:
+                self.transition(State.idle, now)
+
+    def transition(self, to_state: State, updated_at: float):
+        self.state = to_state
+        self.last_update = updated_at
+        logger.debug("State: %s", self.state)
+
+        if to_state == State.idle:
+            self.events_out.put(StoppedPlaying())
+            self.identified = False
+            self.captured = False
+        elif to_state == State.playing:
+            self.events_out.put(StartedPlaying())