Re-factor HTTP server code
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Michael Hansen
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4 changed files with 376 additions and 317 deletions
282
mimic3-http/mimic3_http/app.py
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282
mimic3-http/mimic3_http/app.py
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#!/usr/bin/env python3
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# Copyright 2022 Mycroft AI Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import argparse
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import dataclasses
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import hashlib
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import io
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import logging
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import typing
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import wave
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from dataclasses import dataclass
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from pathlib import Path
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from urllib.parse import parse_qs
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from uuid import uuid4
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import quart_cors
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from mimic3_tts import AudioResult, Mimic3TextToSpeechSystem, SSMLSpeaker
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from quart import (
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Quart,
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Response,
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jsonify,
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render_template,
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request,
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send_from_directory,
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)
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from ._resources import _DIR, _PACKAGE
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from .args import _MISSING
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_LOGGER = logging.getLogger(__name__)
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def get_app(args: argparse.Namespace, mimic3: Mimic3TextToSpeechSystem, temp_dir: str):
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"""Create and return Quart application for Mimic 3 HTTP server"""
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_TEMP_DIR: typing.Optional[Path] = None
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if args.cache_dir != _MISSING:
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if args.cache_dir is None:
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# Use temporary directory
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_TEMP_DIR = Path(temp_dir)
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else:
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# Use user-supplied cache directory
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_TEMP_DIR = Path(args.cache_dir)
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_TEMP_DIR.mkdir(parents=True, exist_ok=True)
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if _TEMP_DIR:
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_LOGGER.debug("Cache directory: %s", _TEMP_DIR)
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@dataclass
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class TextToWavParams:
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"""Synthesis parameters used for caching"""
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text: str
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voice: str = args.voice
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noise_scale: float = args.noise_scale
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noise_w: float = args.noise_w
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length_scale: float = args.length_scale
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ssml: bool = False
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text_language: typing.Optional[str] = None
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@property
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def cache_key(self) -> str:
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return hashlib.md5(repr(self).encode()).hexdigest()
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def text_to_wav(params: TextToWavParams, no_cache: bool = False) -> bytes:
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"""Synthesize text into audio.
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Returns: WAV bytes
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"""
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_LOGGER.debug(params)
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if _TEMP_DIR and (not no_cache):
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# Look up in cache
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maybe_wav_path = _TEMP_DIR / f"{params.cache_key}.wav"
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if maybe_wav_path.is_file():
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_LOGGER.debug("Loading WAV from cache: %s", maybe_wav_path)
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wav_bytes = maybe_wav_path.read_bytes()
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return wav_bytes
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mimic3.voice = params.voice
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mimic3.settings.length_scale = params.length_scale
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mimic3.settings.noise_scale = params.noise_scale
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mimic3.settings.noise_w = params.noise_w
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with io.BytesIO() as wav_io:
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wav_file: wave.Wave_write = wave.open(wav_io, "wb")
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wav_params_set = False
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with wav_file:
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try:
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if params.ssml:
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# SSML
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results = SSMLSpeaker(mimic3).speak(params.text)
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else:
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# Plain text
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mimic3.begin_utterance()
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mimic3.speak_text(
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params.text, text_language=params.text_language
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)
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results = mimic3.end_utterance()
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for result in results:
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# Add audio to existing WAV file
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if isinstance(result, AudioResult):
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if not wav_params_set:
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wav_file.setframerate(result.sample_rate_hz)
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wav_file.setsampwidth(result.sample_width_bytes)
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wav_file.setnchannels(result.num_channels)
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wav_params_set = True
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wav_file.writeframes(result.audio_bytes)
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except Exception as e:
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if not wav_params_set:
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# Set default parameters so exception can propagate
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wav_file.setframerate(22050)
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wav_file.setsampwidth(2)
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wav_file.setnchannels(1)
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raise e
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wav_bytes = wav_io.getvalue()
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if _TEMP_DIR and (not no_cache):
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# Store in cache
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wav_path = _TEMP_DIR / f"{params.cache_key}.wav"
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wav_path.write_bytes(wav_bytes)
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_LOGGER.debug("Cached WAV at %s", wav_path.absolute())
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return wav_bytes
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# -----------------------------------------------------------------------------
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_TEMPLATES_DIR = _DIR / "templates"
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app = Quart(_PACKAGE, template_folder=str(_TEMPLATES_DIR))
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app.secret_key = str(uuid4())
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if args.debug:
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app.config["TEMPLATES_AUTO_RELOAD"] = True
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app = quart_cors.cors(app)
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# -----------------------------------------------------------------------------
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_CSS_DIR = _DIR / "css"
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_IMG_DIR = _DIR / "img"
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def _to_bool(s: str) -> bool:
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return s.strip().lower() in {"true", "1", "yes", "on"}
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@app.route("/img/<path:filename>", methods=["GET"])
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async def img(filename) -> Response:
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"""Image static endpoint."""
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return await send_from_directory(_IMG_DIR, filename)
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@app.route("/css/<path:filename>", methods=["GET"])
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async def css(filename) -> Response:
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"""CSS static endpoint."""
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return await send_from_directory(_CSS_DIR, filename)
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@app.route("/")
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async def app_index():
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"""Main page."""
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return await render_template("index.html")
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@app.route("/api/tts", methods=["GET", "POST"])
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async def app_tts() -> Response:
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"""Speak text to WAV."""
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tts_args: typing.Dict[str, typing.Any] = {}
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_LOGGER.debug("Request args: %s", request.args)
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voice = request.args.get("voice")
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if voice is not None:
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tts_args["voice"] = str(voice)
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# TTS settings
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noise_scale = request.args.get("noiseScale")
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if noise_scale is not None:
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tts_args["noise_scale"] = float(noise_scale)
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noise_w = request.args.get("noiseW")
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if noise_w is not None:
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tts_args["noise_w"] = float(noise_w)
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length_scale = request.args.get("lengthScale")
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if length_scale is not None:
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tts_args["length_scale"] = float(length_scale)
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# Set SSML flag either from arg or content type
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ssml_str = request.args.get("ssml")
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if ssml_str is not None:
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tts_args["ssml"] = _to_bool(ssml_str)
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elif request.content_type == "application/ssml+xml":
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tts_args["ssml"] = True
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text_language = request.args.get("textLanguage")
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if text_language is not None:
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tts_args["text_language"] = str(text_language)
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# Text can come from POST body or GET ?text arg
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if request.method == "POST":
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text = (await request.data).decode()
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else:
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text = request.args.get("text", "")
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assert text, "No text provided"
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# Cache settings
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no_cache_str = request.args.get("noCache", "")
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no_cache = _to_bool(no_cache_str)
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wav_bytes = text_to_wav(
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TextToWavParams(text=text, **tts_args), no_cache=no_cache
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)
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return Response(wav_bytes, mimetype="audio/wav")
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@app.route("/api/voices", methods=["GET"])
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async def api_voices():
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voices_dict = {v.key: v for v in mimic3.get_voices()}
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voices = sorted(voices_dict.values(), key=lambda v: v.key)
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return jsonify([dataclasses.asdict(v) for v in voices])
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@app.route("/process", methods=["GET", "POST"])
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async def api_process():
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"""MaryTTS-compatible /process endpoint"""
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voice = args.voice
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if request.method == "POST":
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data = parse_qs((await request.data).decode())
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text = data.get("INPUT_TEXT", [""])[0]
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if "VOICE" in data:
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voice = str(data.get("VOICE", [voice])[0]).strip()
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else:
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text = request.args.get("INPUT_TEXT", "")
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voice = str(request.args.get("VOICE", voice)).strip()
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voice = voice or args.voice
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# Assume SSML if text begins with an angle bracket
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ssml = text.strip().startswith("<")
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_LOGGER.debug("Speaking with voice '%s': %s", voice, text)
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wav_bytes = text_to_wav(
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TextToWavParams(
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text=text,
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voice=voice,
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ssml=ssml,
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length_scale=args.length_scale,
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noise_scale=args.noise_scale,
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noise_w=args.noise_w,
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)
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)
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return Response(wav_bytes, mimetype="audio/wav")
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@app.errorhandler(Exception)
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async def handle_error(err) -> typing.Tuple[str, int]:
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"""Return error as text."""
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_LOGGER.exception(err)
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return (f"{err.__class__.__name__}: {err}", 500)
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return app
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