181 lines
4.6 KiB
Python
181 lines
4.6 KiB
Python
from collections import namedtuple
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from dataclasses import dataclass, field
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from logging import getLogger
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from queue import Full, Queue
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from threading import Event, RLock
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from time import time
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from typing import Optional
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import sounddevice as sd
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from platypush.utils import wait_for_either
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AudioFrame = namedtuple('AudioFrame', ['data', 'timestamp'])
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@dataclass
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class PauseState:
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"""
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Data class to hold the boilerplate (state + synchronization events) for the
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audio recorder pause API.
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"""
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_paused_event: Event = field(default_factory=Event)
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_recording_event: Event = field(default_factory=Event)
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_state_lock: RLock = field(default_factory=RLock)
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@property
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def paused(self):
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with self._state_lock:
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return self._paused_event.is_set()
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def pause(self):
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"""
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Pause the audio recorder.
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"""
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with self._state_lock:
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self._paused_event.set()
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self._recording_event.clear()
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def resume(self):
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"""
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Resume the audio recorder.
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"""
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with self._state_lock:
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self._paused_event.clear()
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self._recording_event.set()
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def toggle(self):
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"""
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Toggle the audio recorder pause state.
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"""
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with self._state_lock:
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if self.paused:
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self.resume()
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else:
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self.pause()
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def wait_paused(self, timeout: Optional[float] = None):
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"""
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Wait until the audio recorder is paused.
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"""
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self._paused_event.wait(timeout=timeout)
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def wait_recording(self, timeout: Optional[float] = None):
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"""
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Wait until the audio recorder is resumed.
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"""
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self._recording_event.wait(timeout=timeout)
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class AudioRecorder:
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"""
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Audio recorder component that uses the sounddevice library to record audio
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from the microphone.
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"""
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def __init__(
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self,
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stop_event: Event,
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sample_rate: int,
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frame_size: int,
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channels: int,
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paused: bool = False,
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dtype: str = 'int16',
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queue_size: int = 100,
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):
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self.logger = getLogger(__name__)
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self._audio_queue: Queue[AudioFrame] = Queue(maxsize=queue_size)
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self.frame_size = frame_size
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self._stop_event = Event()
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self._upstream_stop_event = stop_event
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self._paused_state = PauseState()
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if paused:
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self._paused_state.pause()
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else:
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self._paused_state.resume()
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self.stream = sd.InputStream(
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samplerate=sample_rate,
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channels=channels,
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dtype=dtype,
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blocksize=frame_size,
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callback=self._audio_callback,
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)
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@property
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def paused(self):
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return self._paused_state.paused
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def __enter__(self):
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"""
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Start the audio stream.
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"""
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self._stop_event.clear()
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self.stream.start()
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return self
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def __exit__(self, *_):
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"""
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Stop the audio stream.
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"""
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self.stop()
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def _audio_callback(self, indata, *_):
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if self.should_stop() or self.paused:
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return
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try:
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self._audio_queue.put_nowait(AudioFrame(indata.reshape(-1), time()))
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except Full:
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self.logger.warning('Audio queue is full, dropping audio frame')
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def read(self, timeout: Optional[float] = None):
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"""
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Read an audio frame from the queue.
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:param timeout: Timeout in seconds. If None, the method will block until
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an audio frame is available.
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:return: Audio frame or None if the timeout has expired.
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"""
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try:
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return self._audio_queue.get(timeout=timeout)
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except TimeoutError:
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self.logger.debug('Audio queue is empty')
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return None
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def stop(self):
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"""
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Stop the audio stream.
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"""
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self._stop_event.set()
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self.stream.stop()
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def pause(self):
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"""
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Pause the audio stream.
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"""
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self._paused_state.pause()
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def resume(self):
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"""
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Resume the audio stream.
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"""
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self._paused_state.resume()
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def toggle(self):
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"""
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Toggle the audio stream pause state.
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"""
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self._paused_state.toggle()
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def should_stop(self):
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return self._stop_event.is_set() or self._upstream_stop_event.is_set()
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def wait(self, timeout: Optional[float] = None):
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"""
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Wait until the audio stream is stopped.
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"""
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wait_for_either(self._stop_event, self._upstream_stop_event, timeout=timeout)
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