Audio Fingerprinting
How can i do that?


Generate a 370 ms long Hann window, take a 370 ms chunk of your audio, then multiply them together, sample-by-sample.  You're just taking a chunk of audio and fading it in and out at the ends to get rid of any glitches at the start and stop of the chunk.


  What is meant by 28/32?


I'm not sure.  I'd guess it means that the waveforms overlap by 28/32 = 87.5%.  This just means that the chunks of audio you read should overlap with chunks you've already read.

Presumably your sample rate is 44100 Hz, and the window length is 214 = 16384 samples = 371.5 ms?  So 


Generate a 16384-point Hann window and store it in memory
Read audio from sample 0 to sample 16383
Multiply them together to get a windowed chunk
Do FFT or whatever other processing on the windowed chunk
Read audio from sample ~2048 to 2048 + 16384 (87.% overlap with previous chunk)
Multiply with window to get a windowed chunk
Do FFT or whatever
Read audio from sample ~4096 to 4096 + 16384
...


The numbers are probably off-by-one, but you get the idea.