scripts/libraries: Add a non-blocking mode to MicroSpeech.

This commit is contained in:
iabdalkader 2024-07-02 20:01:12 +02:00
parent 976aee80ae
commit fab5368329

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@ -61,6 +61,7 @@ class MicroSpeech:
self.audio_buffer = np.zeros((1, _SAMPLES_PER_STEP * 3), dtype=np.int16)
self.spectrogram = np.zeros((1, _SLICE_COUNT * _SLICE_SIZE), dtype=np.int8)
self.pred_history = np.zeros((_AVERAGE_WINDOW_SAMPLES, _CATEGORY_COUNT), dtype=np.float)
self.audio_started = False
audio.init(channels=1, frequency=_AUDIO_FREQUENCY, gain_db=24, samples=_SAMPLES_PER_STEP * 2)
def audio_callback(self, buf):
@ -78,11 +79,19 @@ class MicroSpeech:
self.pred_history = np.roll(self.pred_history, -1, axis=0)
self.pred_history[-1] = self.micro_speech.predict(self.spectrogram)[0]
def start_audio_streaming(self):
if self.audio_started is False:
self.spectrogram[:] = 0
self.pred_history[:] = 0
audio.start_streaming(self.audio_callback)
self.audio_started = True
def stop_audio_streaming(self):
audio.stop_streaming()
self.audio_started = False
def listen(self, timeout=0, callback=None, threshold=0.65, filter=["Yes", "No"]):
self.spectrogram[:] = 0
self.pred_history[:] = 0
# Start audio streaming
audio.start_streaming(self.audio_callback)
self.start_audio_streaming()
stat_ms = time.ticks_ms()
while True:
average_scores = np.mean(self.pred_history, axis=0)
@ -93,10 +102,12 @@ class MicroSpeech:
self.pred_history[:] = 0
self.spectrogram[:] = 0
if callback is None:
audio.stop_streaming()
if timeout != -1: # non-blocking mode
self.stop_audio_streaming()
return (label, average_scores)
callback(label, average_scores)
if timeout == -1: # non-blocking mode
return (None, average_scores)
if timeout != 0 and (time.ticks_ms() - stat_ms) > timeout:
audio.stop_streaming()
return (None, None)
self.stop_audio_streaming()
time.sleep_ms(1)