840 lines
36 KiB
Python
840 lines
36 KiB
Python
"""Wake-word ("Hey Hermes") detection — hands-free session trigger.
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One always-on hotword listener shared by CLI, TUI and desktop GUI (a single owner,
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gated by ``wake_surface_enabled``). Engines live in :mod:`tools.wake_word_engines`;
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this module owns config, the capture loop and the process-wide listener singleton.
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Capture reuses voice mode's 16 kHz mono int16 ``sounddevice`` path on a daemon
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thread; callers ``pause()`` while a voice turn holds the mic and ``resume()`` once
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idle (two input streams on one device is unreliable cross-platform).
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"""
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from __future__ import annotations
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import logging
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import os
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import queue
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import sys
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import threading
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import time
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from contextlib import suppress
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Any, Callable, Dict, Optional
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from tools.wake_word_engines import _Engine, _OpenWakeWordEngine, _PorcupineEngine, _SherpaKwsEngine, _sub
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logger = logging.getLogger(__name__)
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SAMPLE_RATE = 16000 # 16 kHz mono int16 — Whisper-native and what every engine expects.
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# Minimum gap between two wake fires, so one "hey hermes" can't retrigger across
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# several frames while the caller is still reacting.
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_FIRE_COOLDOWN_SECONDS = 2.0
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_START_TIMEOUT_SECONDS = 5.0
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# Ambient-speech rejection: N consecutive over-threshold frames before firing
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# (a stray phoneme spikes one frame; a real phrase holds several).
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_DEFAULT_CONFIRMATION_FRAMES = 3
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# Dead-mic detection: an int16 stream whose peak stays at/below _SILENCE_PEAK for
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# this many consecutive seconds is flagged silent (desktop push-to-talk and the
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# backend listener capture differently, so one can work while the other is all zeros).
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_SILENCE_PEAK = 10
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_SILENCE_ALERT_SECONDS = 10
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# provider alias -> (engine class name on this module, lazy_deps feature).
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# Unknown providers probe as openwakeword but fail to build.
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_PROVIDERS: Dict[str, tuple[str, str]] = {
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"porcupine": ("_PorcupineEngine", "wake.porcupine"),
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**{k: ("_SherpaKwsEngine", "wake.sherpa") for k in ("sherpa", "sherpa-onnx", "kws", "open")},
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**{k: ("_OpenWakeWordEngine", "wake.openwakeword") for k in ("openwakeword", "oww", "local")},
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}
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class WakeWordInUse(RuntimeError):
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"""Raised when another surface or process owns the wake-word listener."""
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# ── Config ──
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# capture: "local" (PortAudio on the backend host), "client" (desktop/TUI streams int16
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# frames via wake.feed), or "auto" (local when a device exists, else client).
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_DEFAULTS: Dict[str, Any] = {
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"enabled": False, "surface": "auto", "input_device": None, "capture": "auto",
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"provider": "openwakeword", "phrase": "hey hermes", "sensitivity": 0.6,
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"confirmation_frames": _DEFAULT_CONFIRMATION_FRAMES, "start_new_session": True,
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}
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# Bundled "hey hermes" model (tools/wakewords/) — the default; alias names resolve
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# to it, not to an openWakeWord built-in.
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_BUNDLED_MODEL_NAME = "hey_hermes"
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_BUNDLED_MODEL_ALIASES = frozenset({"", "hey_hermes", "hey hermes", "hermes"})
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def _bundled_wakeword_path(framework: str = "onnx") -> str:
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"""Path to the shipped hey_hermes model (.onnx/.tflite) for ``framework``."""
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ext = "tflite" if str(framework).strip().lower() == "tflite" else "onnx"
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return os.path.join(os.path.dirname(__file__), "wakewords", f"{_BUNDLED_MODEL_NAME}.{ext}")
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def _is_macos_arm64() -> bool:
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import platform
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return sys.platform == "darwin" and platform.machine() == "arm64"
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def default_inference_framework() -> str:
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"""tflite on macOS ARM64, onnx elsewhere: openWakeWord's ONNX embedding model
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scores near-zero on Apple Silicon — the detector arms but never fires."""
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return "tflite" if _is_macos_arm64() else "onnx"
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_warned_onnx_coerced = False
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def resolve_inference_framework(cfg: Dict[str, Any]) -> str:
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"""Effective openWakeWord backend: explicit ``openwakeword.inference_framework`` or
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the platform default. Explicit ``onnx`` on macOS ARM64 is provably dead, so it is
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coerced to tflite with a one-time warning (a pre-fix pin must not stay deaf)."""
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global _warned_onnx_coerced
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framework = str(_sub(cfg, "openwakeword").get("inference_framework") or "").strip().lower()
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if not framework:
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return default_inference_framework()
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if framework == "onnx" and _is_macos_arm64():
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if not _warned_onnx_coerced:
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_warned_onnx_coerced = True
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logger.warning("wake: openwakeword.inference_framework='onnx' is set but ONNX's "
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"embedding model never fires on macOS ARM64 (openWakeWord #336) — "
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"using tflite instead. Set inference_framework to '' (auto) or "
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"'tflite' in config.yaml to silence this.")
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return "tflite"
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return framework
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def ensure_tflite_runtime() -> bool:
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"""Make ``import tflite_runtime.interpreter`` resolve, returning success. openWakeWord hardcodes
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that import but only declares ``tflite-runtime`` on Linux; on macOS the wheel is ``ai-edge-litert``,
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so alias it in-process (site-packages untouched)."""
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try:
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import tflite_runtime.interpreter # noqa: F401
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return True
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except ImportError:
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pass
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try:
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from ai_edge_litert import interpreter as _litert # type: ignore[import-not-found]
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except ImportError:
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return False
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import types
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pkg = types.ModuleType("tflite_runtime")
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pkg.__path__ = [] # type: ignore[attr-defined] # mark as package
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sys.modules.setdefault("tflite_runtime", pkg)
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sys.modules["tflite_runtime.interpreter"] = _litert
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logger.debug("wake word: bridged tflite_runtime -> ai_edge_litert")
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return True
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def load_wake_word_config() -> Dict[str, Any]:
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"""Return the ``wake_word`` config section, shape-guarded to a dict."""
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cfg = None
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with suppress(Exception):
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from hermes_cli.config import load_config
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cfg = load_config().get("wake_word")
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return cfg if isinstance(cfg, dict) else {}
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def _get(cfg: Dict[str, Any], key: str) -> Any:
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val = cfg.get(key)
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return _DEFAULTS.get(key) if val is None else val
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def _clamped(cfg: Dict[str, Any], key: str, cast, lo, hi):
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"""Numeric config value via ``cast``, defaulting on junk, clamped to lo..hi."""
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try:
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n = cast(_get(cfg, key))
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except (TypeError, ValueError):
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n = cast(_DEFAULTS[key])
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return min(max(n, lo), hi)
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def _provider(cfg: Dict[str, Any]) -> str:
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return str(_get(cfg, "provider")).strip().lower() or "openwakeword"
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def _input_device(cfg: Dict[str, Any]) -> int | str | None:
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"""Configured PortAudio input selector, preserving indices and names."""
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raw = _get(cfg, "input_device")
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return None if isinstance(raw, bool) else raw if raw is None or isinstance(raw, int) else (str(raw).strip() or None)
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def _sensitivity(cfg: Dict[str, Any]) -> float:
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return _clamped(cfg, "sensitivity", float, 0.0, 1.0)
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def _confirmation_frames(cfg: Dict[str, Any]) -> int:
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"""Consecutive over-threshold frames required to fire, clamped 1..10 (1 = single-frame)."""
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return _clamped(cfg, "confirmation_frames", int, 1, 10)
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def wake_phrase(cfg: Optional[Dict[str, Any]] = None) -> str:
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"""Human-facing wake phrase label (purely cosmetic; engine keys detection)."""
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cfg = cfg if cfg is not None else load_wake_word_config()
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return str(_get(cfg, "phrase")) or "hey hermes"
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def resolve_capture_mode(cfg: Optional[Dict[str, Any]] = None, *, prefer_client: bool = False,
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force_local: bool = False) -> str:
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"""Return ``local`` or ``client`` capture mode for this arm. ``prefer_client`` is set by remote
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desktop; ``force_local`` keeps CLI/TUI on the process mic. Under ``auto`` a working backend input
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always wins; client is the fallback only for a preferring surface with no usable backend mic —
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CLI/TUI stay local so status reports the real requirement rather than a path nothing will feed."""
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cfg = cfg if cfg is not None else load_wake_word_config()
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if force_local:
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return "local"
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raw = str(_get(cfg, "capture") or "auto").strip().lower()
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if raw in ("client", "remote", "external"):
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return "client"
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return "client" if raw != "local" and prefer_client and not _local_input_device_ready() else "local"
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def _input_channels(info: Any) -> int:
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ch = info.get("max_input_channels") if isinstance(info, dict) else getattr(info, "max_input_channels", 0)
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return int(ch or 0)
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def _local_input_device_ready() -> bool:
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"""True when PortAudio is importable and at least one input device exists."""
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try:
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sd, _ = _import_audio()
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devices = sd.query_devices()
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if isinstance(devices, dict):
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return _input_channels(devices) > 0
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# Also accept a resolvable default input (some hosts list devices oddly).
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return (any(_input_channels(d) > 0 for d in devices)
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or _input_channels(sd.query_devices(None, "input")) > 0)
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except Exception:
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return False
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def wake_surface_enabled(surface: str, cfg: Optional[Dict[str, Any]] = None) -> bool:
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"""Should ``surface`` (cli/tui/gui) host the listener? True when enabled and the configured
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surface is ``auto`` or this one; ``auto`` only makes it eligible — the lock admits one claimant."""
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cfg = cfg if cfg is not None else load_wake_word_config()
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want = str(_get(cfg, "surface")).strip().lower() or "auto"
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return bool(cfg.get("enabled")) and want in ("auto", surface.strip().lower())
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# ── Multi-profile phrase enrollment (open-vocabulary routing) ──
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def _active_profile_name() -> str:
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with suppress(Exception):
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from hermes_cli.profiles import get_active_profile_name
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return get_active_profile_name() or "default"
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return "default"
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def enrolled_profile_phrases() -> Dict[str, str]:
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"""Map ``profile name -> wake phrase`` for every wake-enabled profile, reading each profile's own
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``config.yaml`` raw (``load_config()`` targets only the ACTIVE profile). Phrase defaults to
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``"hey <profile>"``; the sherpa engine listens for all and routes to the match. Unreadable → skipped."""
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phrases: Dict[str, str] = {}
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with suppress(Exception):
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from hermes_cli.config import read_user_config_raw
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from hermes_cli.profiles import get_profile_dir, list_profiles
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for info in list_profiles():
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name = getattr(info, "name", None) or str(info)
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with suppress(Exception):
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wc = read_user_config_raw(Path(get_profile_dir(name)) / "config.yaml").get("wake_word") or {}
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if isinstance(wc, dict) and wc.get("enabled"):
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phrase = str(wc.get("phrase") or f"hey {name}").strip()
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if phrase:
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phrases[name] = phrase
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return phrases
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# ── Audio capture (lazy — never import sounddevice at module load) ──
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def _import_audio():
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import numpy as np
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import sounddevice as sd
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return sd, np
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def _audio_available() -> bool:
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with suppress(ImportError, OSError):
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return bool(_import_audio())
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return False
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def _describe_input_device(selector: int | str | None, sd=None) -> Dict[str, Any]:
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"""Resolve a PortAudio selector into JSON-safe diagnostics (``InputStream`` stays the
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authority on whether the device actually opens). Imports sounddevice unless ``sd`` is given."""
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details: Dict[str, Any] = {"selector": selector}
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try:
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sd = sd or _import_audio()[0]
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info = sd.query_devices(selector, "input")
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except Exception as e:
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details["error"] = str(e)
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return details
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if not isinstance(info, dict):
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return details
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if info.get("name"):
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details["name"] = str(info["name"])
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for key, out_key, cast in (("max_input_channels", "max_input_channels", int),
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("default_samplerate", "default_samplerate", float), ("hostapi", "hostapi_index", int)):
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if isinstance(info.get(key), (int, float)):
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details[out_key] = cast(info[key])
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if "hostapi_index" in details:
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with suppress(Exception):
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hostapi = sd.query_hostapis(details["hostapi_index"])
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if isinstance(hostapi, dict) and hostapi.get("name"):
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details["hostapi"] = str(hostapi["name"])
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return details
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def _resample_audio_frame(np, frame, output_length: int):
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"""Convert one native-rate capture block to an exact engine frame."""
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source = np.asarray(frame, dtype=np.float64).reshape(-1)
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if source.size == output_length:
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return np.asarray(frame, dtype=np.int16).reshape(-1)
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if source.size == 0:
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return np.zeros(output_length, dtype=np.int16)
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if source.size > output_length:
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# Average each source window when reducing (matches the desktop wake capture
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# path) so speech energy is retained instead of decimated.
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edges = np.linspace(0, source.size, output_length + 1, dtype=np.int64)
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values = np.add.reduceat(source, edges[:-1]) / np.diff(edges)
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else:
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# Unusual low-rate devices: interpolate up to the 16 kHz frame size.
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source_positions = np.arange(source.size, dtype=np.float64)
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values = np.interp(np.linspace(0, source.size - 1, output_length), source_positions, source)
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return np.rint(values).clip(-32768, 32767).astype(np.int16)
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def silent_audio_hint(details: Dict[str, Any]) -> str:
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"""Platform-specific remediation for an armed stream delivering silence."""
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if sys.platform == "darwin":
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return ("Microphone delivers only silence. Grant the Hermes backend "
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"microphone access in System Settings > Privacy & Security > "
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"Microphone, then toggle the wake word.")
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fix = ("Set wake_word.input_device to a different PortAudio input device"
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if sys.platform == "win32" else "Check the selected input device")
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selector = details.get("selector")
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label = str(details.get("name") or "").strip() or ("system default" if selector is None else str(selector))
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hostapi = str(details.get("hostapi") or "").strip()
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label = f"{label} ({hostapi})" if hostapi else label
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return f"Microphone delivers only silence from {label}. {fix}, then toggle the wake word."
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# ── Engines (implementations live in tools.wake_word_engines) ──
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def _build_engine(cfg: Dict[str, Any]) -> _Engine:
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provider = _provider(cfg)
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if provider not in _PROVIDERS:
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raise ValueError(f"Unknown wake_word provider: {provider!r}")
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return globals()[_PROVIDERS[provider][0]](cfg)
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# ── Requirements probe (for /wake status + enable path) ──
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def _stt_ready() -> bool:
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"""Is a speech-to-text provider configured and enabled? (A wake without STT arms the
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mic but every utterance dies at transcription — same bar as ``check_voice_requirements``.)"""
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with suppress(Exception):
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from tools.transcription_tools import _get_provider, _load_stt_config, is_stt_enabled
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stt_config = _load_stt_config()
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return is_stt_enabled(stt_config) and _get_provider(stt_config) != "none"
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return False
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def _tts_ready() -> bool:
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"""Can the configured TTS provider run (or install at first use)? PROBE, not an installer:
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``check_tts_requirements`` lazily pip-installs the SDK, which froze wake.status polls for a whole
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pip run. Uninstalled deps count as ready iff lazy installs are allowed; pip is never touched here."""
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try:
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from tools.tts_tool import _get_provider, _load_tts_config, check_tts_requirements
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provider = _get_provider(_load_tts_config())
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feature = f"tts.{provider}" if provider in ("edge", "elevenlabs", "mistral") else None
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if feature is not None:
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from tools import lazy_deps
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if not lazy_deps.is_available(feature):
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return lazy_deps._allow_lazy_installs()
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return bool(check_tts_requirements())
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except Exception:
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return False
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def check_wake_word_requirements(cfg: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
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"""Report whether wake-word detection can run, with a remediation hint."""
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cfg = cfg if cfg is not None else load_wake_word_config()
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provider = _provider(cfg)
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from tools import lazy_deps
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feature = _PROVIDERS.get(provider, ("", "wake.openwakeword"))[1]
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deps_ok = lazy_deps.is_available(feature)
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lazy_ok = lazy_deps._allow_lazy_installs()
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# The audio probe imports sounddevice + numpy — packages the lazy installer would
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# fetch — so only trust it once deps are installed; on a fresh install the engine
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# constructors' ``lazy_deps.ensure()`` + stream-open surface any real audio problem.
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audio_ok = _audio_available() if deps_ok else False
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# Loop is wake → record → STT → agent → TTS; without either end the mic hears you
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# and nothing perceptible happens — refuse with a hint.
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stt_ok, tts_ok = _stt_ready(), _tts_ready()
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# tflite needs a runtime openWakeWord doesn't declare off Linux; report it as a
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# remediation instead of arming a detector that can't fire.
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tflite_ok = (feature != "wake.openwakeword" or resolve_inference_framework(cfg) != "tflite"
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or ensure_tflite_runtime() or lazy_deps.is_available("wake.openwakeword.tflite") or lazy_ok)
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key_ok = provider != "porcupine" or bool((os.getenv("PORCUPINE_ACCESS_KEY") or "").strip())
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capture_mode = resolve_capture_mode(cfg)
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missing = " and ".join(n for n, ok in (("speech-to-text", stt_ok), ("text-to-speech", tts_ok)) if not ok)
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# Ordered remediation ladder: first true predicate wins.
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ladder = (
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(not key_ok, lambda: "Set PORCUPINE_ACCESS_KEY (free key at https://console.picovoice.ai)."),
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(not deps_ok and not lazy_ok, lambda: lazy_deps.feature_install_command(feature) or ""),
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(not tflite_ok,
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lambda: "The wake word needs the tflite runtime on this Mac: pip install ai-edge-litert"),
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(deps_ok and not audio_ok and capture_mode == "local",
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lambda: "Microphone capture needs sounddevice + numpy and a working audio device."),
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(bool(missing), lambda: (f"Wake word needs {missing} configured — run `hermes tools` "
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f"(Voice section) or see the voice-mode docs.")),
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)
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hint = next((make() for cond, make in ladder if cond), "")
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# Client capture needs deps (engine) but not a server-side PortAudio device.
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if capture_mode == "client":
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mic_ok = deps_ok or lazy_ok
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else:
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mic_ok = (deps_ok and audio_ok) or (not deps_ok and lazy_ok)
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if deps_ok and not audio_ok and not hint:
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hint = ("No local microphone on this backend. Remote desktop can stream "
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"the client mic — set wake_word.capture: client or use a desktop "
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"build with client-capture wake support.")
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return {
|
|
"available": key_ok and stt_ok and tts_ok and tflite_ok and mic_ok, "provider": provider,
|
|
"deps_available": deps_ok, "audio_available": audio_ok,
|
|
"local_input_available": _local_input_device_ready() if deps_ok else False,
|
|
"capture": capture_mode, "access_key_set": key_ok, "stt_available": stt_ok, "tts_available": tts_ok,
|
|
"phrase": wake_phrase(cfg), "hint": hint,
|
|
}
|
|
|
|
|
|
# ── Detector ──
|
|
|
|
@dataclass
|
|
class _Capture:
|
|
"""One armed audio source: a PortAudio stream (local) or the feed queue (client)."""
|
|
|
|
stream: Any = None # sounddevice.InputStream, None in client mode
|
|
queue: Any = None # client-capture frame queue, None in local mode
|
|
np: Any = None
|
|
rate: int = SAMPLE_RATE
|
|
frame_length: int = 1280 # samples per read at ``rate``
|
|
|
|
def read(self):
|
|
"""One raw block; None when no client frame arrived within 250 ms. Stream errors propagate."""
|
|
if self.stream is not None:
|
|
return self.stream.read(self.frame_length)[0]
|
|
with suppress(Exception):
|
|
return self.queue.get(timeout=0.25)
|
|
return None
|
|
|
|
def close(self) -> None:
|
|
with suppress(Exception):
|
|
if self.stream is not None:
|
|
self.stream.stop()
|
|
self.stream.close()
|
|
|
|
|
|
class WakeWordDetector:
|
|
"""Background hotword listener; fires ``on_wake()`` when the phrase is heard. The engine is built
|
|
once and kept across pause/resume — only the stream + reader thread cycle, so mic toggles are cheap."""
|
|
|
|
def __init__(self, engine: _Engine, on_wake: Callable[[], None], cooldown: float = _FIRE_COOLDOWN_SECONDS,
|
|
on_failure: Optional[Callable[["WakeWordDetector"], None]] = None,
|
|
input_device: int | str | None = None, external_audio: bool = False):
|
|
self.engine, self.on_wake, self.cooldown, self.on_failure = engine, on_wake, cooldown, on_failure
|
|
self.input_device, self.external_audio = input_device, bool(external_audio)
|
|
self.input_device_details: Dict[str, Any] = (
|
|
{"selector": "client", "name": "client capture", "hostapi": "remote"}
|
|
if self.external_audio else {"selector": input_device})
|
|
self._thread: Optional[threading.Thread] = None
|
|
self._stop, self._callback_inflight = threading.Event(), threading.Event()
|
|
self._lock, self._last_fire = threading.Lock(), 0.0
|
|
# Client-capture PCM queue (int16 mono frames). Local mode ignores this.
|
|
self._audio_q: "queue.Queue[Any]" = queue.Queue(maxsize=64)
|
|
# True when the stream is open but every frame is (near-)silence, so status
|
|
# surfaces can tell "armed" from "deaf".
|
|
self.audio_silent, self._silent_frames = False, 0
|
|
|
|
@property
|
|
def running(self) -> bool:
|
|
t = self._thread
|
|
return t is not None and t.is_alive()
|
|
|
|
def feed(self, pcm_int16) -> None:
|
|
"""Enqueue one int16 mono frame (or raw bytes) for client capture. Short frames are
|
|
zero-padded to ``engine.frame_length``, long ones split; on overflow the oldest is dropped."""
|
|
if not self.external_audio:
|
|
return
|
|
try:
|
|
import numpy as np
|
|
except Exception:
|
|
return
|
|
if isinstance(pcm_int16, (bytes, bytearray, memoryview)):
|
|
arr = np.frombuffer(pcm_int16, dtype=np.int16)
|
|
else:
|
|
arr = np.asarray(pcm_int16, dtype=np.int16).reshape(-1)
|
|
fl = int(self.engine.frame_length)
|
|
if fl <= 0:
|
|
return
|
|
for offset in range(0, int(arr.shape[0]), fl):
|
|
chunk = arr[offset : offset + fl]
|
|
if chunk.shape[0] < fl:
|
|
chunk = np.pad(chunk, (0, fl - chunk.shape[0]))
|
|
try:
|
|
self._audio_q.put_nowait(chunk)
|
|
except Exception:
|
|
# Drop oldest on overflow so we stay real-time
|
|
with suppress(Exception):
|
|
self._audio_q.get_nowait()
|
|
with suppress(Exception):
|
|
self._audio_q.put_nowait(chunk)
|
|
|
|
def start(self) -> None:
|
|
"""Open the mic (or client feeder) and begin listening. Idempotent."""
|
|
with self._lock:
|
|
if self.running:
|
|
return
|
|
self._stop.clear()
|
|
ready = threading.Event()
|
|
startup_errors: list[BaseException] = []
|
|
self._thread = threading.Thread(target=self._run, args=(ready, startup_errors),
|
|
daemon=True, name="wake-word")
|
|
self._thread.start()
|
|
if not ready.wait(_START_TIMEOUT_SECONDS):
|
|
self._halt_thread()
|
|
raise TimeoutError("Timed out while opening the wake-word microphone.")
|
|
if startup_errors:
|
|
self._halt_thread()
|
|
raise RuntimeError("Failed to open the wake-word microphone.") from startup_errors[0]
|
|
|
|
# pause/resume keep the engine; stop tears it down.
|
|
def pause(self) -> None:
|
|
self._halt_thread()
|
|
|
|
def resume(self) -> None:
|
|
self.start()
|
|
|
|
def stop(self) -> None:
|
|
self._halt_thread()
|
|
self.engine.close()
|
|
|
|
def _halt_thread(self) -> None:
|
|
with self._lock:
|
|
self._stop.set()
|
|
t = self._thread
|
|
if t is not None and t is not threading.current_thread():
|
|
t.join(timeout=2.0)
|
|
if self._thread is t:
|
|
self._thread = None
|
|
|
|
def _dispatch_wake(self) -> None:
|
|
try:
|
|
self.on_wake()
|
|
except Exception as e:
|
|
logger.warning("wake word callback failed: %s", e)
|
|
finally:
|
|
self._callback_inflight.clear()
|
|
|
|
def _open_capture(self, frame_length: int) -> _Capture:
|
|
"""Open the audio source; raises on any local-mic failure."""
|
|
if self.external_audio:
|
|
with suppress(Exception): # drain stale frames from a previous arm
|
|
while True:
|
|
self._audio_q.get_nowait()
|
|
logger.info("wake word: client-capture mode (frame=%d, rate=%d) — waiting for wake.feed",
|
|
frame_length, SAMPLE_RATE)
|
|
return _Capture(queue=self._audio_q, frame_length=frame_length)
|
|
|
|
try:
|
|
sd, np = _import_audio()
|
|
except (ImportError, OSError) as e:
|
|
logger.error("wake word: audio libraries unavailable: %s", e)
|
|
raise
|
|
details = self.input_device_details = _describe_input_device(self.input_device, sd)
|
|
# Capture at the device's native rate when PortAudio reports one; frames are resampled to the engine.
|
|
cap, rate = _Capture(np=np), details.get("default_samplerate")
|
|
if isinstance(rate, (int, float)) and not isinstance(rate, bool) and rate > 0:
|
|
with suppress(OverflowError, ValueError):
|
|
cap.rate = int(round(rate))
|
|
cap.frame_length = max(1, int(round(frame_length * cap.rate / SAMPLE_RATE)))
|
|
logger.info("wake word: opening microphone device=%s selector=%r hostapi=%s "
|
|
"default_rate=%s capture_rate=%d engine_rate=%d", details.get("name") or "system default",
|
|
self.input_device, details.get("hostapi") or "unknown",
|
|
details.get("default_samplerate") or "unknown", cap.rate, SAMPLE_RATE)
|
|
try:
|
|
cap.stream = sd.InputStream(device=self.input_device, samplerate=cap.rate, channels=1,
|
|
dtype="int16", blocksize=cap.frame_length)
|
|
cap.stream.start()
|
|
except Exception as e:
|
|
logger.error("wake word: failed to open microphone: %s", e)
|
|
raise
|
|
return cap
|
|
|
|
def _note_silence(self, frame, silent_alert_frames: int) -> None:
|
|
"""Track consecutive near-zero frames; flag/unflag ``audio_silent``. ``frame`` is None when
|
|
no client frame arrived (counts as silence for status, but is never logged as a dead mic)."""
|
|
try:
|
|
peak = 0 if frame is None or not len(frame) else int(abs(frame).max())
|
|
except Exception:
|
|
peak = _SILENCE_PEAK + 1
|
|
if peak <= _SILENCE_PEAK:
|
|
self._silent_frames += 1
|
|
if self._silent_frames == silent_alert_frames:
|
|
self.audio_silent = True
|
|
if frame is not None:
|
|
logger.warning("wake word: mic delivers only silence (peak<=%d for %ds); %s",
|
|
_SILENCE_PEAK, _SILENCE_ALERT_SECONDS,
|
|
silent_audio_hint(self.input_device_details))
|
|
elif self._silent_frames:
|
|
if self.audio_silent:
|
|
logger.info("wake word: mic audio detected — stream healthy")
|
|
self._silent_frames, self.audio_silent = 0, False
|
|
|
|
def _fire(self) -> None:
|
|
"""Honor the cooldown, then run ``on_wake`` on its own thread (once)."""
|
|
now = time.monotonic()
|
|
if now - self._last_fire < self.cooldown:
|
|
logger.debug("wake word: detection within cooldown — ignored")
|
|
return
|
|
self._last_fire = now
|
|
logger.info("wake word: phrase detected — firing callback")
|
|
if not self._callback_inflight.is_set():
|
|
self._callback_inflight.set()
|
|
threading.Thread(target=self._dispatch_wake, daemon=True, name="wake-word-callback").start()
|
|
|
|
def _run(self, ready: threading.Event, startup_errors: list[BaseException]) -> None:
|
|
frame_length = self.engine.frame_length
|
|
try:
|
|
cap = self._open_capture(frame_length)
|
|
except Exception as e:
|
|
startup_errors.append(e)
|
|
ready.set()
|
|
return
|
|
# Drop buffered audio/feature state so a resume right after a voice turn can't
|
|
# re-fire on audio captured before the pause (wake → voice → resume → wake loop).
|
|
with suppress(Exception):
|
|
self.engine.reset()
|
|
logger.info("wake word: listening (frame=%d, rate=%d, external=%s)",
|
|
frame_length, SAMPLE_RATE, self.external_audio)
|
|
ready.set()
|
|
failed = False
|
|
silent_alert_frames = max(1, int(_SILENCE_ALERT_SECONDS * SAMPLE_RATE / max(1, frame_length)))
|
|
try:
|
|
while not self._stop.is_set():
|
|
try:
|
|
data = cap.read()
|
|
except Exception as e:
|
|
logger.warning("wake word: stream read error: %s", e)
|
|
failed = not self._stop.is_set()
|
|
break
|
|
if data is None: # no client frames yet — counts as silence for status
|
|
self._note_silence(None, silent_alert_frames)
|
|
continue
|
|
frame = data[:, 0] if getattr(data, "ndim", 1) == 2 else data
|
|
if cap.rate != SAMPLE_RATE:
|
|
frame = _resample_audio_frame(cap.np, frame, frame_length)
|
|
self._note_silence(frame, silent_alert_frames)
|
|
try:
|
|
if self.engine.process(frame):
|
|
self._fire()
|
|
except Exception as e:
|
|
logger.debug("wake word: engine error: %s", e)
|
|
finally:
|
|
cap.close()
|
|
logger.info("wake word: stream closed")
|
|
if failed and self.on_failure is not None:
|
|
self.on_failure(self)
|
|
|
|
|
|
# ── Process-wide singleton (mirrors hermes_cli.voice's continuous API) ──
|
|
|
|
_detector: Optional[WakeWordDetector] = None
|
|
_detector_owner: object | None = None
|
|
_detector_file_lock = None
|
|
_detector_lock = threading.Lock()
|
|
|
|
|
|
def _lock_path() -> Path:
|
|
from hermes_constants import get_default_hermes_root
|
|
return get_default_hermes_root() / "runtime" / "wake-word.lock"
|
|
|
|
|
|
def _flock(handle, acquire: bool) -> None:
|
|
"""Non-blocking exclusive lock (or unlock) of one byte / whole file, per OS."""
|
|
if os.name == "nt":
|
|
import msvcrt
|
|
if acquire: # msvcrt needs at least one byte to lock
|
|
handle.seek(0, os.SEEK_END)
|
|
if handle.tell() == 0:
|
|
handle.write(b"\0")
|
|
handle.flush()
|
|
handle.seek(0)
|
|
msvcrt.locking(handle.fileno(), msvcrt.LK_NBLCK if acquire else msvcrt.LK_UNLCK, 1)
|
|
else:
|
|
import fcntl
|
|
fcntl.flock(handle.fileno(), (fcntl.LOCK_EX | fcntl.LOCK_NB) if acquire else fcntl.LOCK_UN)
|
|
|
|
|
|
def _acquire_machine_lock(path: Optional[Path] = None):
|
|
"""Acquire the cross-process microphone lease, or raise WakeWordInUse."""
|
|
lock_path = path or _lock_path()
|
|
lock_path.parent.mkdir(parents=True, exist_ok=True)
|
|
handle = open(lock_path, "a+b")
|
|
try:
|
|
_flock(handle, True)
|
|
except OSError as e: # BlockingIOError is an OSError: lock held elsewhere
|
|
handle.close()
|
|
raise WakeWordInUse("Wake-word microphone is already owned.") from e
|
|
return handle
|
|
|
|
|
|
def _release_machine_lock(handle) -> None:
|
|
if handle is None:
|
|
return
|
|
try:
|
|
_flock(handle, False)
|
|
except OSError:
|
|
pass
|
|
finally:
|
|
handle.close()
|
|
|
|
|
|
def _teardown_locked(close: Callable[[], None]) -> None:
|
|
"""Forget the singleton and run ``close``, always releasing the machine lease (caller holds the lock)."""
|
|
global _detector, _detector_owner, _detector_file_lock
|
|
lock_handle = _detector_file_lock
|
|
_detector = _detector_owner = _detector_file_lock = None
|
|
try:
|
|
close()
|
|
finally:
|
|
_release_machine_lock(lock_handle)
|
|
|
|
|
|
def _owned_detector(owner: object) -> Optional[WakeWordDetector]:
|
|
"""The armed detector iff ``owner`` holds the lease (caller holds the lock)."""
|
|
return _detector if _detector is not None and _detector_owner is owner else None
|
|
|
|
|
|
def _detector_failed(detector: WakeWordDetector) -> None:
|
|
"""Release ownership if the active microphone stream dies unexpectedly."""
|
|
with _detector_lock:
|
|
if _detector is detector:
|
|
_teardown_locked(detector.engine.close)
|
|
|
|
|
|
def start_listening(on_wake: Callable[[], None], *, owner: object, config: Optional[Dict[str, Any]] = None,
|
|
external_audio: bool = False) -> WakeWordDetector:
|
|
"""Claim, build, and start the detector. Idempotent for the same owner; a different owner
|
|
(or process) gets :class:`WakeWordInUse`. Raises if engine construction fails (missing deps /
|
|
access key / model) — callers should probe :func:`check_wake_word_requirements` first."""
|
|
if owner is None:
|
|
raise ValueError("wake-word owner must not be None")
|
|
|
|
global _detector, _detector_owner, _detector_file_lock
|
|
with _detector_lock:
|
|
if _detector is not None:
|
|
if _detector_owner is not owner:
|
|
raise WakeWordInUse("Wake-word microphone is already owned.")
|
|
_detector.on_wake = on_wake
|
|
_detector.resume()
|
|
return _detector
|
|
_detector_file_lock = _acquire_machine_lock()
|
|
try:
|
|
cfg = config if config is not None else load_wake_word_config()
|
|
_detector = WakeWordDetector(_build_engine(cfg), on_wake, on_failure=_detector_failed,
|
|
input_device=_input_device(cfg), external_audio=external_audio)
|
|
_detector_owner = owner
|
|
_detector.start()
|
|
return _detector
|
|
except Exception:
|
|
with suppress(Exception):
|
|
_teardown_locked(_detector.stop if _detector is not None else lambda: None)
|
|
raise
|
|
|
|
|
|
def _owned_call(owner: object, action: Optional[Callable[[WakeWordDetector], None]] = None) -> bool:
|
|
"""Under the lock, True iff ``owner`` holds the lease; also runs ``action(detector)`` when given."""
|
|
with _detector_lock:
|
|
det = _owned_detector(owner)
|
|
if det is None:
|
|
return False
|
|
if action is not None:
|
|
action(det)
|
|
return True
|
|
|
|
|
|
def owns_listener(owner: object) -> bool:
|
|
return _owned_call(owner)
|
|
|
|
|
|
def pause_listening(*, owner: object) -> bool:
|
|
"""Release the microphone only when ``owner`` holds the lease."""
|
|
return _owned_call(owner, WakeWordDetector.pause)
|
|
|
|
|
|
def resume_listening(*, owner: object) -> bool:
|
|
"""Re-open the microphone only when ``owner`` holds the lease."""
|
|
return _owned_call(owner, WakeWordDetector.resume)
|
|
|
|
|
|
def stop_listening(*, owner: object) -> bool:
|
|
"""Fully stop the detector only when ``owner`` holds the lease."""
|
|
return _owned_call(owner, lambda det: _teardown_locked(det.stop))
|
|
|
|
|
|
def _current_detector() -> Optional[WakeWordDetector]:
|
|
with _detector_lock:
|
|
return _detector
|
|
|
|
|
|
def is_listening() -> bool:
|
|
return (det := _current_detector()) is not None and det.running
|
|
|
|
|
|
def audio_is_silent() -> bool:
|
|
"""True when the armed stream opens fine but delivers only silence (dead mic), so
|
|
detection can never fire; status shows "listening but the microphone appears silent"."""
|
|
return (det := _current_detector()) is not None and det.audio_silent
|
|
|
|
|
|
def get_input_device_status(cfg: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
|
|
"""Return configured/active PortAudio input diagnostics for status UIs."""
|
|
if (det := _current_detector()) is not None:
|
|
return dict(det.input_device_details)
|
|
return _describe_input_device(_input_device(cfg if cfg is not None else load_wake_word_config()))
|
|
|
|
|
|
def get_last_match() -> Optional[tuple[str, str]]:
|
|
"""(matched phrase, profile) of the most recent wake fire when the engine reports
|
|
per-phrase matches (sherpa multi-profile routing); None otherwise."""
|
|
return None if (det := _current_detector()) is None else getattr(det.engine, "last_match", None)
|
|
|
|
|
|
def feed_audio(*, owner: object, pcm_int16) -> bool:
|
|
"""Push client-captured PCM into ``owner``'s armed detector; True when accepted."""
|
|
with _detector_lock:
|
|
det = _owned_detector(owner)
|
|
if det is None or not det.external_audio:
|
|
return False
|
|
det.feed(pcm_int16)
|
|
return True
|
|
|
|
|
|
def detector_frame_info() -> Dict[str, Any]:
|
|
"""Sample rate + frame length for client capture streamers."""
|
|
if (det := _current_detector()) is None:
|
|
return {"sample_rate": SAMPLE_RATE, "frame_length": 1280}
|
|
return {"sample_rate": SAMPLE_RATE, "external_audio": bool(det.external_audio),
|
|
"frame_length": int(getattr(det.engine, "frame_length", 1280) or 1280)}
|