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from __future__ import annotations
import logging
from typing import TYPE_CHECKING
from faster_whisper_server.audio import Audio, AudioStream
from faster_whisper_server.text_utils import Transcription, common_prefix, to_full_sentences, word_to_text
if TYPE_CHECKING:
from collections.abc import AsyncGenerator
from faster_whisper_server.api_models import TranscriptionWord
from faster_whisper_server.asr import FasterWhisperASR
logger = logging.getLogger(__name__)
class LocalAgreement:
def __init__(self) -> None:
self.unconfirmed = Transcription()
def merge(self, confirmed: Transcription, incoming: Transcription) -> list[TranscriptionWord]:
# https://github.com/ufal/whisper_streaming/blob/main/whisper_online.py#L264
incoming = incoming.after(confirmed.end - 0.1)
prefix = common_prefix(incoming.words, self.unconfirmed.words)
logger.debug(f"Confirmed: {confirmed.text}")
logger.debug(f"Unconfirmed: {self.unconfirmed.text}")
logger.debug(f"Incoming: {incoming.text}")
if len(incoming.words) > len(prefix):
self.unconfirmed = Transcription(incoming.words[len(prefix) :])
else:
self.unconfirmed = Transcription()
return prefix
# TODO: needs a better name
def needs_audio_after(confirmed: Transcription) -> float:
full_sentences = to_full_sentences(confirmed.words)
return full_sentences[-1][-1].end if len(full_sentences) > 0 else 0.0
def prompt(confirmed: Transcription) -> str | None:
sentences = to_full_sentences(confirmed.words)
return word_to_text(sentences[-1]) if len(sentences) > 0 else None
async def audio_transcriber(
asr: FasterWhisperASR,
audio_stream: AudioStream,
min_duration: float,
) -> AsyncGenerator[Transcription, None]:
local_agreement = LocalAgreement()
full_audio = Audio()
confirmed = Transcription()
async for chunk in audio_stream.chunks(min_duration):
full_audio.extend(chunk)
audio = full_audio.after(needs_audio_after(confirmed))
transcription, _ = await asr.transcribe(audio, prompt(confirmed))
new_words = local_agreement.merge(confirmed, transcription)
if len(new_words) > 0:
confirmed.extend(new_words)
yield confirmed
logger.debug("Flushing...")
confirmed.extend(local_agreement.unconfirmed.words)
yield confirmed
logger.info("Audio transcriber finished")