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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