805 lines
28 KiB
Python
805 lines
28 KiB
Python
"""Satellite code."""
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import asyncio
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import logging
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import math
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import time
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from enum import Enum, auto
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from pathlib import Path
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from typing import Callable, Optional, Set, Union
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from pyring_buffer import RingBuffer
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from wyoming.asr import Transcript
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from wyoming.audio import AudioChunk, AudioStart, AudioStop
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from wyoming.client import AsyncClient
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from wyoming.error import Error
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from wyoming.event import Event, async_write_event
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from wyoming.mic import MicProcessAsyncClient
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from wyoming.pipeline import PipelineStage, RunPipeline
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from wyoming.satellite import RunSatellite
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from wyoming.snd import SndProcessAsyncClient
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from wyoming.tts import Synthesize
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from wyoming.vad import VoiceStarted, VoiceStopped
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from wyoming.wake import Detect, Detection, WakeProcessAsyncClient
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from .settings import SatelliteSettings
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from .utils import multiply_volume, run_event_command, wav_to_events
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from .vad import SileroVad
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from .webrtc import WebRtcAudio
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_LOGGER = logging.getLogger()
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class State(Enum):
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NOT_STARTED = auto()
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STARTING = auto()
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STARTED = auto()
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RESTARTING = auto()
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STOPPING = auto()
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STOPPED = auto()
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# -----------------------------------------------------------------------------
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class SatelliteBase:
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def __init__(self, settings: SatelliteSettings) -> None:
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self.settings = settings
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self.server_id: Optional[str] = None
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self._state = State.NOT_STARTED
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self._state_changed = asyncio.Event()
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self._writer: Optional[asyncio.StreamWriter] = None
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self._mic_task: Optional[asyncio.Task] = None
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self._mic_webrtc: Optional[Callable[[bytes], bytes]] = None
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self._snd_task: Optional[asyncio.Task] = None
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self._snd_queue: "Optional[asyncio.Queue[Event]]" = None
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self._wake_task: Optional[asyncio.Task] = None
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self._wake_queue: "Optional[asyncio.Queue[Event]]" = None
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self._event_task: Optional[asyncio.Task] = None
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self._event_queue: "Optional[asyncio.Queue[Event]]" = None
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@property
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def is_running(self) -> bool:
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return self._state not in (State.STOPPING, State.STOPPED)
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@property
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def state(self) -> State:
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return self._state
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@state.setter
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def state(self, value: State) -> None:
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self._state = value
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self._state_changed.set()
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self._state_changed.clear()
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async def run(self) -> None:
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while self.is_running:
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try:
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if self.state == State.NOT_STARTED:
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await self._start()
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elif self.state == State.RESTARTING:
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await self._restart()
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elif self.state == State.STOPPING:
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await self._stop()
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elif self.state == State.STOPPED:
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await self.stopped()
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break
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else:
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await self._state_changed.wait()
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except Exception:
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if self.is_running:
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# Automatically restart
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_LOGGER.exception("Unexpected error running satellite")
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self.state = State.RESTARTING
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async def _start(self) -> None:
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self.state = State.STARTING
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await self._connect_to_services()
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self.state = State.STARTED
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await self.started()
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async def started(self) -> None:
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pass
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async def _stop(self) -> None:
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self.server_id = None
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self._writer = None
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await self._disconnect_from_services()
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self.state = State.STOPPED
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async def stop(self) -> None:
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self.state = State.STOPPING
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# Wait for STOPPED
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while self.state != State.STOPPED:
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await self._state_changed.wait()
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async def stopped(self) -> None:
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pass
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def set_server(self, server_id: str, writer: asyncio.StreamWriter) -> None:
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self.server_id = server_id
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self._writer = writer
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async def event_from_server(self, event: Event) -> None:
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"""Called when an event is received from the server."""
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if AudioChunk.is_type(event.type):
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# TTS audio
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await self.event_to_snd(event)
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elif AudioStart.is_type(event.type):
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# TTS started
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await self.event_to_snd(event)
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await self.trigger_tts_start()
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elif AudioStop.is_type(event.type):
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# TTS stopped
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await self.event_to_snd(event)
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await self.trigger_tts_stop()
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elif Detect.is_type(event.type):
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# Wake word detection started
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await self.trigger_detect()
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elif Detection.is_type(event.type):
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# Wake word detected
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_LOGGER.debug("Wake word detected")
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await self.trigger_detection(Detection.from_event(event))
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elif VoiceStarted.is_type(event.type):
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# STT start
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await self.trigger_stt_start()
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elif VoiceStopped.is_type(event.type):
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# STT stop
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await self.trigger_stt_stop()
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elif Transcript.is_type(event.type):
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# STT text
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_LOGGER.debug(event)
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await self.trigger_transcript(Transcript.from_event(event))
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elif Synthesize.is_type(event.type):
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# TTS request
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_LOGGER.debug(event)
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await self.trigger_synthesize(Synthesize.from_event(event))
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elif Error.is_type(event.type):
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_LOGGER.warning(event)
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await self.trigger_error(Error.from_event(event))
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# Forward everything except audio to event service
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if not AudioChunk.is_type(event.type):
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await self.forward_event(event)
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async def event_to_server(self, event: Event) -> None:
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"""Send an event to the server."""
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if self._writer is None:
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return
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await async_write_event(event, self._writer)
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async def _send_run_pipeline(self) -> None:
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if self.settings.wake.enabled:
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# Local wake word detection
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start_stage = PipelineStage.ASR
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else:
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# Remote wake word detection
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start_stage = PipelineStage.WAKE
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if self.settings.snd.enabled:
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# Play TTS response
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end_stage = PipelineStage.TTS
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else:
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# No audio output
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end_stage = PipelineStage.HANDLE
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run_pipeline = RunPipeline(start_stage=start_stage, end_stage=end_stage).event()
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await self.event_to_server(run_pipeline)
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await self.forward_event(run_pipeline)
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async def _restart(self) -> None:
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self.state = State.RESTARTING
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await self._disconnect_from_services()
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_LOGGER.debug("Restarting in %s second(s)", self.settings.restart_timeout)
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await asyncio.sleep(self.settings.restart_timeout)
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self.state = State.NOT_STARTED
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async def _connect_to_services(self) -> None:
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if self.settings.mic.enabled:
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_LOGGER.debug(
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"Connecting to mic service: %s",
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self.settings.mic.uri or self.settings.mic.command,
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)
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self._mic_task = asyncio.create_task(self._mic_task_proc())
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if self.settings.snd.enabled:
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_LOGGER.debug(
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"Connecting to snd service: %s",
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self.settings.snd.uri or self.settings.snd.command,
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)
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self._snd_task = asyncio.create_task(self._snd_task_proc())
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if self.settings.wake.enabled:
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_LOGGER.debug(
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"Connecting to wake service: %s",
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self.settings.wake.uri or self.settings.wake.command,
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)
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self._wake_task = asyncio.create_task(self._wake_task_proc())
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if self.settings.event.enabled:
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_LOGGER.debug(
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"Connecting to event service: %s",
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self.settings.event.uri or self.settings.event.command,
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)
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self._event_task = asyncio.create_task(self._event_task_proc())
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_LOGGER.info("Connected to services")
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async def _disconnect_from_services(self) -> None:
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if self._mic_task is not None:
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_LOGGER.debug("Stopping microphone service")
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self._mic_task.cancel()
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self._mic_task = None
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if self._snd_task is not None:
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_LOGGER.debug("Stopping sound service")
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self._snd_task.cancel()
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self._snd_task = None
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if self._wake_task is not None:
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_LOGGER.debug("Stopping wake service")
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self._wake_task.cancel()
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self._wake_task = None
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if self._event_task is not None:
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_LOGGER.debug("Stopping event service")
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self._event_task.cancel()
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self._event_task = None
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_LOGGER.debug("Disconnected from services")
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# -------------------------------------------------------------------------
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# Microphone
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# -------------------------------------------------------------------------
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async def event_from_mic(
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self, event: Event, audio_bytes: Optional[bytes] = None
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) -> None:
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pass
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def _make_mic_client(self) -> Optional[AsyncClient]:
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if self.settings.mic.command:
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program, *program_args = self.settings.mic.command
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return MicProcessAsyncClient(
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rate=self.settings.mic.rate,
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width=self.settings.mic.width,
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channels=self.settings.mic.channels,
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samples_per_chunk=self.settings.mic.samples_per_chunk,
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program=program,
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program_args=program_args,
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)
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if self.settings.mic.uri:
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return AsyncClient.from_uri(self.settings.mic.uri)
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return None
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async def _mic_task_proc(self) -> None:
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mic_client: Optional[AsyncClient] = None
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audio_bytes: Optional[bytes] = None
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if self.settings.mic.needs_webrtc and (self._mic_webrtc is None):
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_LOGGER.debug("Using webrtc audio enhancements")
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self._mic_webrtc = WebRtcAudio(
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self.settings.mic.auto_gain, self.settings.mic.noise_suppression
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)
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async def _disconnect() -> None:
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try:
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if mic_client is not None:
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await mic_client.disconnect()
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except Exception:
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pass # ignore disconnect errors
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while self.is_running:
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try:
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if mic_client is None:
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mic_client = self._make_mic_client()
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assert mic_client is not None
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await mic_client.connect()
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_LOGGER.debug("Connected to mic service")
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event = await mic_client.read_event()
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if event is None:
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_LOGGER.warning("Mic service disconnected")
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await _disconnect()
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mic_client = None # reconnect
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await asyncio.sleep(self.settings.mic.reconnect_seconds)
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continue
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# Audio processing
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if self.settings.mic.needs_processing and AudioChunk.is_type(
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event.type
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):
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chunk = AudioChunk.from_event(event)
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audio_bytes = self._process_mic_audio(chunk.audio)
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event = AudioChunk(
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rate=chunk.rate,
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width=chunk.width,
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channels=chunk.channels,
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audio=audio_bytes,
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).event()
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else:
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audio_bytes = None
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await self.event_from_mic(event, audio_bytes)
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except asyncio.CancelledError:
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break
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except Exception:
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_LOGGER.exception("Unexpected error in mic read task")
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await _disconnect()
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mic_client = None # reconnect
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await asyncio.sleep(self.settings.mic.reconnect_seconds)
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await _disconnect()
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def _process_mic_audio(self, audio_bytes: bytes) -> bytes:
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if self.settings.mic.volume_multiplier != 1.0:
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audio_bytes = multiply_volume(
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audio_bytes, self.settings.mic.volume_multiplier
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)
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if self._mic_webrtc is not None:
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audio_bytes = self._mic_webrtc(audio_bytes)
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return audio_bytes
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# -------------------------------------------------------------------------
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# Sound
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# -------------------------------------------------------------------------
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async def event_to_snd(self, event: Event) -> None:
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"""Send an event to the sound service."""
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if self._snd_queue is not None:
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self._snd_queue.put_nowait(event)
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def _make_snd_client(self) -> Optional[AsyncClient]:
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if self.settings.snd.command:
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program, *program_args = self.settings.snd.command
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return SndProcessAsyncClient(
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rate=self.settings.snd.rate,
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width=self.settings.snd.width,
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channels=self.settings.snd.channels,
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program=program,
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program_args=program_args,
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)
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if self.settings.snd.uri:
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return AsyncClient.from_uri(self.settings.snd.uri)
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return None
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async def _snd_task_proc(self) -> None:
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snd_client: Optional[AsyncClient] = None
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async def _disconnect() -> None:
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try:
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if snd_client is not None:
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await snd_client.disconnect()
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except Exception:
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pass # ignore disconnect errors
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while self.is_running:
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try:
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if self._snd_queue is None:
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self._snd_queue = asyncio.Queue()
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event = await self._snd_queue.get()
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if snd_client is None:
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snd_client = self._make_snd_client()
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assert snd_client is not None
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await snd_client.connect()
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_LOGGER.debug("Connected to snd service")
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# TODO: audio processing
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await snd_client.write_event(event)
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except asyncio.CancelledError:
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break
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except Exception:
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_LOGGER.exception("Unexpected error in snd read task")
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await _disconnect()
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snd_client = None # reconnect
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self._snd_queue = None
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await asyncio.sleep(self.settings.snd.reconnect_seconds)
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await _disconnect()
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async def _play_wav(self, wav_path: Optional[Union[str, Path]]) -> None:
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"""Send WAV as events to sound service."""
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if (not wav_path) or (not self.settings.snd.enabled):
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return
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for event in wav_to_events(
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wav_path,
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samples_per_chunk=self.settings.snd.samples_per_chunk,
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volume_multiplier=self.settings.snd.volume_multiplier,
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):
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await self.event_to_snd(event)
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# -------------------------------------------------------------------------
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# Wake
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# -------------------------------------------------------------------------
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async def event_from_wake(self, event: Event) -> None:
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pass
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async def event_to_wake(self, event: Event) -> None:
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if self._wake_queue is not None:
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self._wake_queue.put_nowait(event)
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def _make_wake_client(self) -> Optional[AsyncClient]:
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if self.settings.wake.command:
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program, *program_args = self.settings.wake.command
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return WakeProcessAsyncClient(
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rate=self.settings.wake.rate,
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width=self.settings.wake.width,
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channels=self.settings.wake.channels,
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program=program,
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program_args=program_args,
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)
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if self.settings.wake.uri:
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return AsyncClient.from_uri(self.settings.wake.uri)
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return None
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async def _wake_task_proc(self) -> None:
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wake_client: Optional[AsyncClient] = None
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to_client_task: Optional[asyncio.Task] = None
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from_client_task: Optional[asyncio.Task] = None
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pending: Set[asyncio.Task] = set()
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async def _disconnect() -> None:
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try:
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if wake_client is not None:
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await wake_client.disconnect()
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except Exception:
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pass # ignore disconnect errors
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while self.is_running:
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try:
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if self._wake_queue is None:
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self._wake_queue = asyncio.Queue()
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if wake_client is None:
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wake_client = self._make_wake_client()
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assert wake_client is not None
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await wake_client.connect()
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_LOGGER.debug("Connected to wake service")
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# Reset
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from_client_task = None
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to_client_task = None
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pending = set()
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self._wake_queue = asyncio.Queue()
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await self._send_wake_detect()
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if to_client_task is None:
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# From satellite to wake service
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to_client_task = asyncio.create_task(self._wake_queue.get())
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pending.add(to_client_task)
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if from_client_task is None:
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# From wake service to satellite
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from_client_task = asyncio.create_task(wake_client.read_event())
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pending.add(from_client_task)
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done, pending = await asyncio.wait(
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pending, return_when=asyncio.FIRST_COMPLETED
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)
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if to_client_task in done:
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assert to_client_task is not None
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event = to_client_task.result()
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to_client_task = None
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await wake_client.write_event(event)
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if from_client_task in done:
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assert from_client_task is not None
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event = from_client_task.result()
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from_client_task = None
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if event is None:
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_LOGGER.warning("Wake service disconnected")
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await _disconnect()
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wake_client = None # reconnect
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await asyncio.sleep(self.settings.wake.reconnect_seconds)
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continue
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# TODO: audio processing
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await self.event_from_wake(event)
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except asyncio.CancelledError:
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break
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except Exception:
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_LOGGER.exception("Unexpected error in wake read task")
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await _disconnect()
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wake_client = None # reconnect
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await asyncio.sleep(self.settings.wake.reconnect_seconds)
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await _disconnect()
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async def _send_wake_detect(self) -> None:
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"""Inform wake word service of which wake words to detect."""
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await self.event_to_wake(Detect(names=self.settings.wake.names).event())
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await self.trigger_detect()
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# -------------------------------------------------------------------------
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# Events
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# -------------------------------------------------------------------------
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async def trigger_streaming_start(self) -> None:
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await run_event_command(self.settings.event.streaming_start)
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async def trigger_streaming_stop(self) -> None:
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await run_event_command(self.settings.event.streaming_stop)
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async def trigger_detect(self) -> None:
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await run_event_command(self.settings.event.detect)
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async def trigger_detection(self, detection: Detection) -> None:
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await run_event_command(self.settings.event.detection, detection.name)
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await self._play_wav(self.settings.snd.awake_wav)
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async def trigger_transcript(self, transcript: Transcript) -> None:
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await run_event_command(self.settings.event.transcript, transcript.text)
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await self._play_wav(self.settings.snd.done_wav)
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async def trigger_stt_start(self) -> None:
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await run_event_command(self.settings.event.stt_start)
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async def trigger_stt_stop(self) -> None:
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await run_event_command(self.settings.event.stt_stop)
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async def trigger_synthesize(self, synthesize: Synthesize) -> None:
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await run_event_command(self.settings.event.synthesize, synthesize.text)
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async def trigger_tts_start(self) -> None:
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await run_event_command(self.settings.event.tts_start)
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async def trigger_tts_stop(self) -> None:
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await run_event_command(self.settings.event.tts_stop)
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async def trigger_error(self, error: Error) -> None:
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await run_event_command(self.settings.event.error, error.text)
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async def forward_event(self, event: Event) -> None:
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"""Forward an event to the event service."""
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if self._event_queue is not None:
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self._event_queue.put_nowait(event)
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def _make_event_client(self) -> Optional[AsyncClient]:
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if self.settings.event.uri:
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return AsyncClient.from_uri(self.settings.event.uri)
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return None
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async def _event_task_proc(self) -> None:
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event_client: Optional[AsyncClient] = None
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async def _disconnect() -> None:
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try:
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if event_client is not None:
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await event_client.disconnect()
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except Exception:
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pass # ignore disconnect errors
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while self.is_running:
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try:
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if self._event_queue is None:
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self._event_queue = asyncio.Queue()
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event = await self._event_queue.get()
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if event_client is None:
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event_client = self._make_event_client()
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assert event_client is not None
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await event_client.connect()
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_LOGGER.debug("Connected to event service")
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await event_client.write_event(event)
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except asyncio.CancelledError:
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break
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except Exception:
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_LOGGER.exception("Unexpected error in event read task")
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await _disconnect()
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event_client = None # reconnect
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self._event_queue = None
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await asyncio.sleep(self.settings.event.reconnect_seconds)
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await _disconnect()
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# -----------------------------------------------------------------------------
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class AlwaysStreamingSatellite(SatelliteBase):
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"""Satellite that always streams audio."""
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def __init__(self, settings: SatelliteSettings) -> None:
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super().__init__(settings)
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self.is_streaming = False
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async def event_from_server(self, event: Event) -> None:
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await super().event_from_server(event)
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if RunSatellite.is_type(event.type):
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self.is_streaming = True
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_LOGGER.info("Streaming audio")
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await self._send_run_pipeline()
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await self.trigger_streaming_start()
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elif Transcript.is_type(event.type):
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_LOGGER.info("Streaming audio")
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await self.trigger_streaming_start()
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async def event_from_mic(
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self, event: Event, audio_bytes: Optional[bytes] = None
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) -> None:
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if not self.is_streaming:
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return
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if AudioChunk.is_type(event.type):
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# Forward to server
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await self.event_to_server(event)
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# -----------------------------------------------------------------------------
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class VadStreamingSatellite(SatelliteBase):
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"""Satellite that only streams after speech is detected."""
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def __init__(self, settings: SatelliteSettings) -> None:
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if not settings.vad.enabled:
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raise ValueError("VAD is not enabled")
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super().__init__(settings)
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self.is_streaming = False
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self.vad = SileroVad(
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threshold=settings.vad.threshold, trigger_level=settings.vad.trigger_level
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)
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self.timeout_seconds: Optional[float] = None
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self.vad_buffer: Optional[RingBuffer] = None
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if settings.vad.buffer_seconds > 0:
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# Assume 16Khz, 16-bit mono samples
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vad_buffer_bytes = int(math.ceil(settings.vad.buffer_seconds * 16000 * 2))
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self.vad_buffer = RingBuffer(maxlen=vad_buffer_bytes)
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async def event_from_server(self, event: Event) -> None:
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await super().event_from_server(event)
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if RunSatellite.is_type(event.type):
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_LOGGER.info("Waiting for speech")
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async def event_from_mic(
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self, event: Event, audio_bytes: Optional[bytes] = None
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) -> None:
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if not AudioChunk.is_type(event.type):
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return
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if (
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self.is_streaming
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and (self.timeout_seconds is not None)
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and (time.monotonic() >= self.timeout_seconds)
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):
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# Time out during wake word recognition
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self.is_streaming = False
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self.timeout_seconds = None
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# Stop pipeline
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await self.event_to_server(AudioStop().event())
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_LOGGER.info("Waiting for speech")
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await self.trigger_streaming_stop()
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if not self.is_streaming:
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# Check VAD
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chunk: Optional[AudioChunk] = None
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if audio_bytes is None:
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# Need to unpack
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chunk = AudioChunk.from_event(event)
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audio_bytes = chunk.audio
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if not self.vad(audio_bytes):
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# No speech
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if self.vad_buffer is not None:
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self.vad_buffer.put(audio_bytes)
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return
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# Speech detected
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self.is_streaming = True
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_LOGGER.info("Streaming audio")
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await self._send_run_pipeline()
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await self.trigger_streaming_start()
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if self.settings.vad.wake_word_timeout is not None:
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self.timeout_seconds = (
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time.monotonic() + self.settings.vad.wake_word_timeout
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)
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else:
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self.timeout_seconds = None
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if self.vad_buffer is not None:
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# Send contents of VAD buffer first
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if chunk is None:
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chunk = AudioChunk.from_event(event)
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await self.event_to_server(
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AudioChunk(
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rate=chunk.rate,
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width=chunk.width,
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channels=chunk.channels,
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audio=self.vad_buffer.getvalue(),
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).event()
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)
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self._reset_vad()
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if self.is_streaming:
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# Forward to server
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await self.event_to_server(event)
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def _reset_vad(self):
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self.vad(None)
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if self.vad_buffer is not None:
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self.vad_buffer.put(bytes(self.vad_buffer.maxlen))
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# -----------------------------------------------------------------------------
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class WakeStreamingSatellite(SatelliteBase):
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"""Satellite that waits for local wake word detection before streaming."""
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def __init__(self, settings: SatelliteSettings) -> None:
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if not settings.wake.enabled:
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raise ValueError("Local wake word detection is not enabled")
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super().__init__(settings)
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self.is_streaming = False
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async def event_from_server(self, event: Event) -> None:
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await super().event_from_server(event)
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if RunSatellite.is_type(event.type) or Transcript.is_type(event.type):
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self.is_streaming = False
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await self._send_wake_detect()
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_LOGGER.info("Waiting for wake word")
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if Transcript.is_type(event.type):
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await self.trigger_streaming_stop()
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async def event_from_mic(
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self, event: Event, audio_bytes: Optional[bytes] = None
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) -> None:
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if not AudioChunk.is_type(event.type):
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return
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if self.is_streaming:
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# Forward to server
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await self.event_to_server(event)
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else:
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# Forward to wake word service
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await self.event_to_wake(event)
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async def event_from_wake(self, event: Event) -> None:
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if self.is_streaming:
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return
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if Detection.is_type(event.type):
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self.is_streaming = True
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_LOGGER.debug("Streaming audio")
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await self._send_run_pipeline()
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await self.trigger_detection(Detection.from_event(event))
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await self.trigger_streaming_start()
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