Encode .WAV file to audio playable in mobile devices(.NET Xamarin)

The requirement is to complete a method to encode a .WAV audio file into a audio playable to use it in a xamarin project, The first part encodes to a RAW aac file is almost done needs to be verified if is generating the raw acc properly. Basically the process is: Wav to "Raw aac with adts" then Raw aac needs to be packet to m4a or mp3 container( or any other format playable extension). I attach the audio sample and the class.