from __future__ import annotations import asyncio from typing import AsyncGenerator, BinaryIO import numpy as np import soundfile as sf from numpy.typing import NDArray from faster_whisper_server.config import SAMPLES_PER_SECOND from faster_whisper_server.logger import logger def audio_samples_from_file(file: BinaryIO) -> NDArray[np.float32]: audio_and_sample_rate = sf.read( file, format="RAW", channels=1, samplerate=SAMPLES_PER_SECOND, subtype="PCM_16", dtype="float32", endian="LITTLE", ) audio = audio_and_sample_rate[0] return audio # type: ignore class Audio: def __init__( self, data: NDArray[np.float32] = np.array([], dtype=np.float32), start: float = 0.0, ) -> None: self.data = data self.start = start def __repr__(self) -> str: return f"Audio(start={self.start:.2f}, end={self.end:.2f})" @property def end(self) -> float: return self.start + self.duration @property def duration(self) -> float: return len(self.data) / SAMPLES_PER_SECOND def after(self, ts: float) -> Audio: assert ts <= self.duration return Audio(self.data[int(ts * SAMPLES_PER_SECOND) :], start=ts) def extend(self, data: NDArray[np.float32]) -> None: # logger.debug(f"Extending audio by {len(data) / SAMPLES_PER_SECOND:.2f}s") self.data = np.append(self.data, data) # logger.debug(f"Audio duration: {self.duration:.2f}s") # TODO: trim data longer than x class AudioStream(Audio): def __init__( self, data: NDArray[np.float32] = np.array([], dtype=np.float32), start: float = 0.0, ) -> None: super().__init__(data, start) self.closed = False self.modify_event = asyncio.Event() def extend(self, data: NDArray[np.float32]) -> None: assert not self.closed super().extend(data) self.modify_event.set() def close(self) -> None: assert not self.closed self.closed = True self.modify_event.set() logger.info("AudioStream closed") async def chunks( self, min_duration: float ) -> AsyncGenerator[NDArray[np.float32], None]: i = 0.0 # end time of last chunk while True: await self.modify_event.wait() self.modify_event.clear() if self.closed or self.duration - i >= min_duration: # If `i` shouldn't be set to `duration` after the yield # because by the time assignment would happen more data might have been added i_ = i i = self.duration # NOTE: probably better to just to a slice yield self.after(i_).data if self.closed: return