How to obtaine local audioPcmData from producer’s track ？

mediasoup libraries
1

Remote audioPcmData can be obtained from the consumer’s track , but local track does not have valid PCM data

3

Implement the AudioDeviceDataObserver class, where pcm data can be obtained within the function onCaptureData. Even though, Trying various audio parameters, PCM data still cannot be played normally
And i don’t know why the local audioTrack is empty