Keysat
95524f4983
After five hotfix iterations on the WhisperX install (v0.12.0:0–:4) we
never got a working docker build. The fundamental constraint isn't
patchable from outside NVIDIA: NGC PyTorch on ARM64 (the only base that
runs on Spark 2's GB10 Blackwell) ships a custom-versioned torch
2.10.0a0+b558c98 that has no pre-built torchaudio match anywhere.
WhisperX → pyannote → torchaudio is a hard dependency chain we couldn't
satisfy without rebuilding torchaudio against torch 2.10's alpha API.
Walking away cleanly is better than another night of chasing.
Removed from the codebase:
- image/whisperx_container/* (Dockerfile + requirements + app/main.py)
- image/app/whisperx_install.py (install manager + SSH ship-context logic)
- image/Dockerfile COPY whisperx_container
- WHISPERX_* config keys in config.py
- whisperx service entry in services.py
- WhisperX-preferred branch in audio_proxy.py
- /api/whisperx/* endpoints in server.py
- install banner + progress dialog in index.html
- render + handlers in app.js
- .whisperx-install styles in style.css
Spark 2 cleaned in tandem (user-authorized): container removed,
~/whisperx-build/ removed, 5.4 GB of dangling image layers + 1.3 GB of
builder cache reclaimed. parakeet-asr and magpie-tts unaffected and
healthy throughout.
The audio path is back to exactly what shipped in v0.11.0:3:
POST /api/audio/transcribe-with-speakers
→ Parakeet (transcription) + Sortformer (diarization) in parallel
→ merged by timestamp into speaker-labeled blocks
v0.13.0:1+ will add the actually-needed fixes that the WhisperX detour
was meant to address:
1. memory cap on the parakeet-asr container so a long-audio crash
can't swap-thrash Spark 2 again
2. a chunking proxy in /api/audio/transcribe-with-speakers that
splits inputs >10 min before Sortformer
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
409 lines
17 KiB
Python
409 lines
17 KiB
Python
"""OpenAI-compatible audio proxy: lets any OpenAI-shaped client (Open WebUI,
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Home Assistant, etc.) talk to Parakeet (STT) and Magpie (TTS) through one URL.
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Endpoints exposed on spark-control's port (same as the dashboard):
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GET /v1/models — lists STT model + Magpie voices in OpenAI shape
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POST /v1/audio/speech — OpenAI TTS → Magpie /v1/audio/synthesize
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POST /v1/audio/transcriptions — forward to Parakeet (already OpenAI-compatible)
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Both downstream services already speak HTTP on the LAN; this module just adapts
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request/response shapes so OpenAI clients don't need a custom integration.
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When Parakeet returns a 500 (commonly the recurring CUDA wedge), the proxy
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returns a clearer 503 with Retry-After=60, and fires the deep-health probe in
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the background — which detects the wedge and triggers a rate-limited container
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restart inside seconds. The client's next attempt ~60s later then succeeds.
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"""
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from __future__ import annotations
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import asyncio
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import logging
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from typing import Any, Optional
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import httpx
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from fastapi import APIRouter, Form, HTTPException, Request, UploadFile, File
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from fastapi.responses import Response, StreamingResponse
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from pydantic import BaseModel
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from .config import Settings
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logger = logging.getLogger("spark-control.audio")
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# Magpie voice name encodes its language. Example:
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# Magpie-Multilingual.EN-US.Mia -> en-US
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# Magpie-Multilingual.ES-US.Diego -> es-US
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# Magpie-Multilingual.FR-FR.Pascal -> fr-FR
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def _lang_from_voice(voice: str) -> str:
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try:
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parts = voice.split(".")
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# parts = ["Magpie-Multilingual", "EN-US", "Mia"] (or with emotion suffix)
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if len(parts) >= 2 and "-" in parts[1]:
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lang_part = parts[1] # "EN-US"
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primary, region = lang_part.split("-", 1)
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return f"{primary.lower()}-{region.upper()}"
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except Exception:
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pass
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return "en-US"
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# Default voice: configurable, falls back to a sensible English voice if unset.
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DEFAULT_VOICE = "Magpie-Multilingual.EN-US.Mia"
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class SpeechRequest(BaseModel):
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"""OpenAI /v1/audio/speech request body."""
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model: Optional[str] = None # ignored — Magpie has one model
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input: str # the text to speak
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voice: Optional[str] = None # e.g. "Magpie-Multilingual.EN-US.Mia"
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response_format: Optional[str] = "wav" # only "wav" supported today
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speed: Optional[float] = 1.0 # ignored by Magpie
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# Magpie-specific extensions (clients may pass these through)
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language: Optional[str] = None
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sample_rate_hz: Optional[int] = 22050
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encoding: Optional[str] = "LINEAR_PCM"
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def build_router(settings: Settings, deep_health: Any = None) -> APIRouter:
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"""Build the audio proxy router.
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If `deep_health` is provided, 500s from Parakeet trigger an immediate
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background probe (which contains the same wedge-detect → auto-restart
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logic as the 5-minute periodic loop, but fires now instead of waiting).
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"""
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router = APIRouter()
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def _parakeet_base() -> str:
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return f"http://{settings.parakeet_host}:{settings.parakeet_port}"
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def _magpie_base() -> str:
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return f"http://{settings.magpie_host}:{settings.magpie_port}"
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# ---- /v1/models ----
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@router.get("/v1/models")
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async def list_models() -> dict:
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"""Advertise the STT model + a small voice menu so clients can
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populate their voice-picker UIs. Falls back gracefully if Magpie
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is offline (returns just the STT entry)."""
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data: list[dict] = [
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{
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"id": "parakeet-tdt-0.6b-v3",
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"object": "model",
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"owned_by": "nvidia",
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"kind": "stt",
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},
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]
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# Try to enumerate voices from Magpie; if unreachable, just skip.
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try:
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async with httpx.AsyncClient(timeout=5.0) as client:
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r = await client.get(f"{_magpie_base()}/v1/audio/list_voices")
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if r.status_code == 200:
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voices_by_locales = r.json()
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seen = set()
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for _locales, payload in voices_by_locales.items():
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for v in payload.get("voices", []):
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# Collapse emotion variants — expose only the base voice name.
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# "Magpie-Multilingual.EN-US.Mia.Angry" -> "Magpie-Multilingual.EN-US.Mia"
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parts = v.split(".")
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base = ".".join(parts[:3]) if len(parts) >= 3 else v
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if base not in seen:
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seen.add(base)
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data.append({
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"id": base,
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"object": "model",
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"owned_by": "nvidia",
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"kind": "tts",
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})
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except Exception as e:
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logger.warning("magpie voice list unavailable: %s", e)
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return {"object": "list", "data": data}
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# ---- /v1/audio/speech (TTS) ----
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@router.post("/v1/audio/speech")
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async def speech(body: SpeechRequest) -> Response:
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"""OpenAI-style TTS. Translates to Magpie's multipart synth call.
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Returns raw WAV bytes (Content-Type: audio/wav) — browsers and most
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clients play these directly.
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"""
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text = (body.input or "").strip()
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if not text:
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raise HTTPException(400, "input text is required")
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voice = body.voice or DEFAULT_VOICE
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language = body.language or _lang_from_voice(voice)
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sample_rate = int(body.sample_rate_hz or 22050)
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encoding = body.encoding or "LINEAR_PCM"
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form = {
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"text": text,
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"language": language,
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"voice": voice,
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"sample_rate_hz": str(sample_rate),
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"encoding": encoding,
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}
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try:
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async with httpx.AsyncClient(timeout=120.0) as client:
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r = await client.post(f"{_magpie_base()}/v1/audio/synthesize", data=form)
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except httpx.HTTPError as e:
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raise HTTPException(502, f"magpie unreachable: {e}")
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if r.status_code != 200:
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# Surface Magpie's error message verbatim so clients can debug voice/lang typos.
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raise HTTPException(r.status_code, r.text[:500])
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# Magpie returns WAV bytes already (Content-Type: audio/wav). Pass through.
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media_type = r.headers.get("content-type", "audio/wav")
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return Response(content=r.content, media_type=media_type)
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# ---- /v1/audio/transcriptions (STT) ----
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@router.post("/v1/audio/transcriptions")
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async def transcriptions(
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file: UploadFile = File(...),
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model: Optional[str] = Form(default=None),
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language: Optional[str] = Form(default=None),
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prompt: Optional[str] = Form(default=None),
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response_format: Optional[str] = Form(default="json"),
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temperature: Optional[float] = Form(default=None),
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) -> Response:
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"""Forward to Parakeet's already-OpenAI-compatible endpoint.
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We relay rather than redirect so clients only need to know one URL
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(spark-control's) — and so any future client-side rewrites of the
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request shape (e.g. translating Whisper-format params) happen here.
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"""
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body = await file.read()
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files = {"file": (file.filename or "audio.wav", body, file.content_type or "application/octet-stream")}
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data: dict[str, str] = {}
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if model: data["model"] = model
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if language: data["language"] = language
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if prompt: data["prompt"] = prompt
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if response_format: data["response_format"] = response_format
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if temperature is not None: data["temperature"] = str(temperature)
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try:
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async with httpx.AsyncClient(timeout=300.0) as client:
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r = await client.post(
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f"{_parakeet_base()}/v1/audio/transcriptions",
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files=files, data=data,
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)
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except httpx.HTTPError as e:
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raise HTTPException(502, f"parakeet unreachable: {e}")
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if r.status_code == 500:
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# Parakeet 500s are almost always the CUDA wedge (CUBLAS_*_ERROR
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# mid-attention). Kick deep-health to detect+restart in the
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# background, and return a clean retry signal to the client.
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err_snippet = r.text[:400]
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logger.warning("parakeet 500 — firing deep-health probe in background. detail=%s", err_snippet)
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if deep_health is not None:
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try:
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asyncio.create_task(deep_health.run_one("parakeet"))
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except Exception as e:
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logger.error("failed to schedule deep-health probe: %s", e)
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raise HTTPException(
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status_code=503,
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detail="Parakeet returned a transient error (likely CUDA wedge). Auto-restart triggered; retry in ~60s.",
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headers={"Retry-After": "60"},
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)
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if r.status_code != 200:
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raise HTTPException(r.status_code, r.text[:500])
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return Response(content=r.content, media_type=r.headers.get("content-type", "application/json"))
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# ---- /api/audio/transcribe-with-speakers (STT + diarization, merged) ----
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@router.post("/api/audio/transcribe-with-speakers")
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async def transcribe_with_speakers(
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file: UploadFile = File(...),
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) -> dict:
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"""Diarized transcription: run Parakeet ASR and Sortformer diarization on
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the same audio in parallel, then merge by timestamp.
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Response shape (designed for downstream UIs like recap-relay):
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{
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"duration": 90.5,
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"language": "en",
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"speakers_detected": ["Speaker_0", "Speaker_1"],
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"segments": [
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{"start_ms": 39308, "end_ms": 51000,
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"speaker": "Speaker_0", "text": "good morning i think..."},
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...
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],
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"models": {
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"transcription": "parakeet-tdt-0.6b-v3",
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"diarization": "nvidia/diar_sortformer_4spk-v1"
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}
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}
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Each segment is a block of consecutive words by the same speaker. Speaker
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labels are anonymous (Speaker_0, Speaker_1, ...) — name resolution is the
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caller's responsibility (LLM analysis with optional participant hints,
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or manual mapping UI).
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"""
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body = await file.read()
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if not body:
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raise HTTPException(400, "Empty file")
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filename = file.filename or "audio.wav"
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content_type = file.content_type or "application/octet-stream"
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# Parakeet ASR + Sortformer diarizer in parallel. (A WhisperX detour
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# lived here briefly — reverted in v0.13.0:0; see release notes.)
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async def _call_transcribe(client: httpx.AsyncClient) -> dict:
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files = {"file": (filename, body, content_type)}
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data = {"response_format": "verbose_json"}
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r = await client.post(
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f"{_parakeet_base()}/v1/audio/transcriptions",
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files=files, data=data,
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)
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r.raise_for_status()
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return r.json()
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async def _call_diarize(client: httpx.AsyncClient) -> dict:
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files = {"file": (filename, body, content_type)}
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r = await client.post(
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f"{_parakeet_base()}/v1/audio/diarize",
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files=files,
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)
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r.raise_for_status()
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return r.json()
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# Run both in parallel against the same Parakeet container — Sortformer
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# and Parakeet ASR are independent forward passes that share the GPU.
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try:
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async with httpx.AsyncClient(timeout=600.0) as client:
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stt, diar = await asyncio.gather(
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_call_transcribe(client),
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_call_diarize(client),
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)
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except httpx.HTTPStatusError as e:
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# Surface upstream errors. If transcribe wedged, kick deep-health.
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if e.response.status_code == 500 and deep_health is not None:
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try:
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asyncio.create_task(deep_health.run_one("parakeet"))
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except Exception:
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pass
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raise HTTPException(
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status_code=503,
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detail="Parakeet transient error (likely CUDA wedge). Auto-restart triggered; retry in ~60s.",
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headers={"Retry-After": "60"},
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)
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raise HTTPException(e.response.status_code, e.response.text[:500])
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except httpx.HTTPError as e:
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raise HTTPException(502, f"parakeet unreachable: {e}")
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merged = _merge_words_with_speakers(
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words=stt.get("words", []),
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diar_turns=diar.get("segments", []),
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)
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return {
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"duration": stt.get("duration") or diar.get("duration") or 0.0,
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"language": stt.get("language", "en"),
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"speakers_detected": diar.get("speakers_detected", []),
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"segments": merged,
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"models": {
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"transcription": stt.get("model") if isinstance(stt.get("model"), str) else "parakeet",
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"diarization": diar.get("model", "sortformer"),
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},
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}
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return router
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# ---- Merge helper: assign speaker to each word, then group into blocks ----
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def _assign_speaker_to_word(word_start_s: float, word_end_s: float, diar_turns: list[dict]) -> str:
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"""Find the diarization turn that contains this word, or has the most
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overlap with it. Returns the speaker label, or 'Speaker_unknown' if no
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turn overlaps at all."""
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word_mid = (word_start_s + word_end_s) / 2.0
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# Fast path: find the turn containing the midpoint
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for t in diar_turns:
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if t["start_s"] <= word_mid <= t["end_s"]:
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return t["speaker"]
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# Slow path: pick the turn with max overlap with the word's span
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best_speaker = "Speaker_unknown"
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best_overlap = 0.0
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for t in diar_turns:
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overlap = max(0.0, min(word_end_s, t["end_s"]) - max(word_start_s, t["start_s"]))
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if overlap > best_overlap:
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best_overlap = overlap
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best_speaker = t["speaker"]
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return best_speaker
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def _merge_words_with_speakers(words: list[dict], diar_turns: list[dict]) -> list[dict]:
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"""Group consecutive same-speaker words into blocks.
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Each input word: {"start": float_s, "end": float_s, "text": str} (Parakeet
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verbose_json format; values are seconds).
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Each input turn: {"start_s": float, "end_s": float, "speaker": str}.
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Output: [{"start_ms": int, "end_ms": int, "speaker": str, "text": str}, ...]
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Also breaks a block on a long silence gap (>1.5 s) even within the same
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speaker — keeps blocks readable in UI rendering.
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"""
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if not words:
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return []
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SILENCE_BREAK_S = 1.5
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def _join_words(parts: list[str]) -> str:
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"""Join word tokens with proper spacing. Different STT outputs vary —
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some include leading spaces in the word text (' morning'), some don't
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('morning'). Normalize by stripping each token then joining with one
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space; collapse multiple spaces. Keeps punctuation tight (no space
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before period/comma/etc.)."""
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cleaned = [p.strip() for p in parts if p and p.strip()]
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if not cleaned:
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return ""
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out = cleaned[0]
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for token in cleaned[1:]:
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# No leading space before pure-punctuation tokens
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if token and token[0] in ".,;:!?)]}'\"":
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out += token
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else:
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out += " " + token
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return out
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blocks: list[dict] = []
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cur_words: list[str] = []
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cur_speaker: Optional[str] = None
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cur_start_s: Optional[float] = None
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cur_end_s: Optional[float] = None
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for w in words:
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ws = float(w.get("start", 0.0))
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we = float(w.get("end", ws))
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wt = str(w.get("text", ""))
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spk = _assign_speaker_to_word(ws, we, diar_turns)
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is_new_block = (
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cur_speaker is None
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or spk != cur_speaker
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or (cur_end_s is not None and ws - cur_end_s > SILENCE_BREAK_S)
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)
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if is_new_block:
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if cur_speaker is not None:
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blocks.append({
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"start_ms": int(cur_start_s * 1000),
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"end_ms": int(cur_end_s * 1000),
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"speaker": cur_speaker,
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"text": _join_words(cur_words),
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})
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cur_words = [wt]
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cur_speaker = spk
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cur_start_s = ws
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cur_end_s = we
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else:
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cur_words.append(wt)
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cur_end_s = we
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if cur_speaker is not None and cur_words:
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blocks.append({
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"start_ms": int(cur_start_s * 1000),
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"end_ms": int(cur_end_s * 1000),
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"speaker": cur_speaker,
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"text": _join_words(cur_words),
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})
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return blocks
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