b8950b38a4
Xiaozhi WebSocket endpoint with handshake/auth, mock STT/TTS/Hermes backends, Thai chunker, barge-in queue, latency logger, GPU planner, voice-profile guard (reasoning=none, session_search only). CON-002: no GPU/audio libs loaded at import. MUST-NOT-001: all model names/tokens from config.
98 lines
3.5 KiB
Python
98 lines
3.5 KiB
Python
"""Conversation session — wires audio → STT → voice profile → TTS (REQ-001..008).
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The session is the state machine for one connected device. It owns:
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the PCM buffer, VAD end-of-speech, the TTS queue (for barge-in), and the
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latency logger. It exposes :meth:`on_user_speech` which runs one spoken turn
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end-to-end and yields assistant text chunks — the single seam the websocket
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endpoint drives.
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Cross-session recall (REQ-008): the session holds a ``session_search_fn``
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injected by the caller (the Hermes layer) so "when did we do X?" questions
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can pull a real session snippet, without the session module importing the
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search implementation.
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"""
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from __future__ import annotations
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import asyncio
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from dataclasses import dataclass
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from typing import AsyncIterator, Awaitable, Callable
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from ..audio.buffer import PCMBuffer
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from ..audio.vad import VAD
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from ..metrics.latency import LatencyLogger
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from ..stt import STTEngine
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from ..tts import TTSQueue, TTSEngine, chunk_text
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from ..hermes import HermesClient
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from . import messages
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@dataclass
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class Session:
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client: HermesClient
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stt: STTEngine
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tts: TTSEngine
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vad: VAD
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logger: LatencyLogger
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session_search_fn: Callable[[str], Awaitable[str]] | None = None
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_queue: TTSQueue | None = None
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_buffer: PCMBuffer | None = None
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def __post_init__(self) -> None:
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self._queue = TTSQueue()
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self._buffer = PCMBuffer()
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# -- audio in (REQ-002) -------------------------------------------------
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def feed_audio(self, pcm: bytes) -> None:
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self._buffer.feed(pcm)
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def end_of_speech(self) -> bytes:
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"""Flush the utterance PCM when the VAD reports end-of-speech."""
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self.logger.speech_end()
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return self._buffer.get()
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# -- barge-in (REQ-007) -------------------------------------------------
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def barge_in(self) -> int:
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"""User interrupted: cancel the in-flight TTS. Returns dropped chunks."""
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assert self._queue is not None
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return self._queue.cancel()
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# -- one spoken turn (REQ-001..008) -------------------------------------
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async def run_turn(
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self, user_pcm: bytes
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) -> AsyncIterator[tuple[str, str | bytes]]:
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"""Run one turn; yield ``(kind, payload)`` events.
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* ``("stt", str)`` — final transcript.
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* ``("tts_text", str)`` — assistant text chunk (for display).
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* ``("audio", bytes)`` — PCM chunk (for playback).
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"""
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self.logger.speech_start()
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result = await self.stt.transcribe(user_pcm)
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self.logger.stt_final()
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yield ("stt", result.text)
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self.logger.hermes_request()
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full = ""
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async for chunk in self.client.respond(result.text):
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self.logger.qwen_first_token() # first chunk is the first token
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full += chunk
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yield ("tts_text", chunk)
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# Stream TTS as the answer arrives (REQ-006): speak each speakable
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# chunk before the answer is complete.
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for audio in await self._tts_chunks(chunk):
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self.logger.first_audio_packet()
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yield ("audio", audio)
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self.client.session().push(result.text, full)
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async def _tts_chunks(self, text: str) -> list[bytes]:
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"""Chunk the text and synthesize; collect audio (barge-in via queue)."""
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from ..tts import chunk_text
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out: list[bytes] = []
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q = self._queue
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for piece in chunk_text(text):
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async for audio in self.tts.synthesize(piece):
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await q.put(audio)
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out.append(audio)
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return out
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