The desired_data_size in "le_audio_rx.c"

Question

I want to know where did the "desired_data_size" value in le_audio_rx_data_handler come from? 
 And why "data_size != desired_data_size" means the pkt is bad frame? 
 
 Thank you for your reply.

Amanda Hsieh · Accepted Answer

Before establishing the ISO stream, the unicast client will read the codec support capability information from the unicast server, and then set it to the specific configuration. After that, the unicast server already knows which kind of configuration (sampling rate, bitrate ...) it configured by the unicast server, and then knows the expected received data size. 
 Ref: https://github.com/nrfconnect/sdk-nrf/blob/87dfbdb86fd90233b676dd17a10ab11bbc5e6b59/applications/nrf5340_audio/src/bluetooth/bt_stream/unicast/unicast_server.c#L352

The desired_data_size in "le_audio_rx.c"

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