274 lines
8.0 KiB
Python
274 lines
8.0 KiB
Python
"""Provide functionality to STT."""
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from __future__ import annotations
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from abc import ABC, abstractmethod
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import asyncio
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from dataclasses import asdict, dataclass
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import logging
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from typing import Any
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from aiohttp import StreamReader, web
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from aiohttp.hdrs import istr
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from aiohttp.web_exceptions import (
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HTTPBadRequest,
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HTTPNotFound,
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HTTPUnsupportedMediaType,
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)
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from homeassistant.components.http import HomeAssistantView
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from homeassistant.core import HomeAssistant, callback
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from homeassistant.helpers import config_per_platform, discovery
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from homeassistant.helpers.typing import ConfigType
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from homeassistant.setup import async_prepare_setup_platform
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from .const import (
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DOMAIN,
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AudioBitRates,
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AudioChannels,
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AudioCodecs,
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AudioFormats,
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AudioSampleRates,
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SpeechResultState,
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)
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_LOGGER = logging.getLogger(__name__)
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@callback
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def async_get_provider(hass: HomeAssistant, domain: str | None = None) -> Provider:
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"""Return provider."""
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if domain is None:
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domain = next(iter(hass.data[DOMAIN]))
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return hass.data[DOMAIN][domain]
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async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
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"""Set up STT."""
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providers = hass.data[DOMAIN] = {}
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async def async_setup_platform(p_type, p_config=None, discovery_info=None):
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"""Set up a TTS platform."""
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if p_config is None:
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p_config = {}
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platform = await async_prepare_setup_platform(hass, config, DOMAIN, p_type)
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if platform is None:
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return
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try:
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provider = await platform.async_get_engine(hass, p_config, discovery_info)
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if provider is None:
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_LOGGER.error("Error setting up platform %s", p_type)
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return
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provider.name = p_type
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provider.hass = hass
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providers[provider.name] = provider
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except Exception: # pylint: disable=broad-except
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_LOGGER.exception("Error setting up platform: %s", p_type)
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return
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setup_tasks = [
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asyncio.create_task(async_setup_platform(p_type, p_config))
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for p_type, p_config in config_per_platform(config, DOMAIN)
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]
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if setup_tasks:
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await asyncio.wait(setup_tasks)
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# Add discovery support
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async def async_platform_discovered(platform, info):
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"""Handle for discovered platform."""
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await async_setup_platform(platform, discovery_info=info)
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discovery.async_listen_platform(hass, DOMAIN, async_platform_discovered)
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hass.http.register_view(SpeechToTextView(providers))
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return True
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@dataclass
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class SpeechMetadata:
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"""Metadata of audio stream."""
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language: str
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format: AudioFormats
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codec: AudioCodecs
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bit_rate: AudioBitRates
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sample_rate: AudioSampleRates
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channel: AudioChannels
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def __post_init__(self) -> None:
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"""Finish initializing the metadata."""
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self.bit_rate = AudioBitRates(int(self.bit_rate))
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self.sample_rate = AudioSampleRates(int(self.sample_rate))
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self.channel = AudioChannels(int(self.channel))
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@dataclass
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class SpeechResult:
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"""Result of audio Speech."""
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text: str | None
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result: SpeechResultState
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class Provider(ABC):
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"""Represent a single STT provider."""
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hass: HomeAssistant | None = None
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name: str | None = None
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@property
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@abstractmethod
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def supported_languages(self) -> list[str]:
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"""Return a list of supported languages."""
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@property
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@abstractmethod
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def supported_formats(self) -> list[AudioFormats]:
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"""Return a list of supported formats."""
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@property
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@abstractmethod
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def supported_codecs(self) -> list[AudioCodecs]:
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"""Return a list of supported codecs."""
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@property
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@abstractmethod
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def supported_bit_rates(self) -> list[AudioBitRates]:
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"""Return a list of supported bit rates."""
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@property
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@abstractmethod
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def supported_sample_rates(self) -> list[AudioSampleRates]:
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"""Return a list of supported sample rates."""
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@property
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@abstractmethod
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def supported_channels(self) -> list[AudioChannels]:
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"""Return a list of supported channels."""
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@abstractmethod
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async def async_process_audio_stream(
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self, metadata: SpeechMetadata, stream: StreamReader
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) -> SpeechResult:
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"""Process an audio stream to STT service.
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Only streaming of content are allow!
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"""
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@callback
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def check_metadata(self, metadata: SpeechMetadata) -> bool:
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"""Check if given metadata supported by this provider."""
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if (
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metadata.language not in self.supported_languages
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or metadata.format not in self.supported_formats
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or metadata.codec not in self.supported_codecs
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or metadata.bit_rate not in self.supported_bit_rates
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or metadata.sample_rate not in self.supported_sample_rates
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or metadata.channel not in self.supported_channels
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):
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return False
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return True
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class SpeechToTextView(HomeAssistantView):
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"""STT view to generate a text from audio stream."""
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requires_auth = True
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url = "/api/stt/{provider}"
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name = "api:stt:provider"
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def __init__(self, providers: dict[str, Provider]) -> None:
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"""Initialize a tts view."""
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self.providers = providers
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async def post(self, request: web.Request, provider: str) -> web.Response:
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"""Convert Speech (audio) to text."""
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if provider not in self.providers:
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raise HTTPNotFound()
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stt_provider: Provider = self.providers[provider]
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# Get metadata
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try:
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metadata = metadata_from_header(request)
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except ValueError as err:
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raise HTTPBadRequest(text=str(err)) from err
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# Check format
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if not stt_provider.check_metadata(metadata):
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raise HTTPUnsupportedMediaType()
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# Process audio stream
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result = await stt_provider.async_process_audio_stream(
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metadata, request.content
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)
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# Return result
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return self.json(asdict(result))
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async def get(self, request: web.Request, provider: str) -> web.Response:
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"""Return provider specific audio information."""
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if provider not in self.providers:
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raise HTTPNotFound()
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stt_provider: Provider = self.providers[provider]
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return self.json(
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{
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"languages": stt_provider.supported_languages,
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"formats": stt_provider.supported_formats,
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"codecs": stt_provider.supported_codecs,
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"sample_rates": stt_provider.supported_sample_rates,
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"bit_rates": stt_provider.supported_bit_rates,
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"channels": stt_provider.supported_channels,
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}
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)
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def metadata_from_header(request: web.Request) -> SpeechMetadata:
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"""Extract STT metadata from header.
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X-Speech-Content:
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format=wav; codec=pcm; sample_rate=16000; bit_rate=16; channel=1; language=de_de
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"""
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try:
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data = request.headers[istr("X-Speech-Content")].split(";")
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except KeyError as err:
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raise ValueError("Missing X-Speech-Content header") from err
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fields = (
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"language",
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"format",
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"codec",
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"bit_rate",
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"sample_rate",
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"channel",
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)
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# Convert Header data
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args: dict[str, Any] = {}
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for entry in data:
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key, _, value = entry.strip().partition("=")
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if key not in fields:
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raise ValueError(f"Invalid field {key}")
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args[key] = value
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for field in fields:
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if field not in args:
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raise ValueError(f"Missing {field} in X-Speech-Content header")
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try:
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return SpeechMetadata(
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language=args["language"],
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format=args["format"],
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codec=args["codec"],
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bit_rate=args["bit_rate"],
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sample_rate=args["sample_rate"],
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channel=args["channel"],
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)
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except TypeError as err:
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raise ValueError(f"Wrong format of X-Speech-Content: {err}") from err
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