[Python] What frame rate to expect using Python sounddevice.InputStream on macbook?

I record audio on a macbook using this code:

def callback(indata, frame_count, time_info, status):
if status:
print('Error:', status)
frames.append(indata.copy())
...

with sd.InputStream(callback=callback, channels=1, samplerate=1600) as stream:
while True:
sd.sleep(100)



After 5 seconds passed I get only ~5000 frames in total and about 100 frames per sleep call. I don't understand why the frame count is so low, shouldn't it be 16000 frames per second?

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