[opus] Questions regarding OPUS_APPLICATION_AUDIO vs OPUS_BANDWIDTH_NARROWBAND

[Tony]

I have an audio device whose 'driver' gives me Opus encoded frames using
OPUS_APPLICATION_AUDIO and max bandwidth set to OPUS_BANDWIDTH_NARROWBAND.
How does Opus encoder decide the center point of the 4K bandpass filter?
Is it done frame by frame?

-- 
Tony
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