decoding dtmf in real time

[denizsincar29]

hello. recently i cloned this repozitory and wanted to make it decode dtmf in real time. but i couldn't figure out how to do that.
i'm blind and i use a screenreading software to write this issue, so maybe markdown can be a little wrong.
the template is like this:

import sounddevice as sd
def callback(indata,frames,time,status):
    pass

with sd.InputStream(samplerate=48000,channels=1,dtype='float32',callback=callback):
    while True:
        continue

callback receives the data from the microphone.
please can you tell me how to implement that?