How to process JavaScript blob in python?

Question

I want to process an audio blob in python that is received via socketio from a javascript client.

I want the audio data as numpy array to process it, but I don't seem to be able to convert the blob properly.

The audio blob contains:

[Float32Array[32768], Float32Array[32768]]

In python, I tried:

@socketio.on('gotaudio')
def get_audio(blob):  
    //CONVERT THE BLOB
    data = blob[0]
    dat = np.array(json.loads(data));
    //DO SOME SIGNAL PROCESSING
    fftData=abs(np.fft.rfft(dat))**2;
    ....

But this throws the error:

TypeError: expected string or buffer

How can I transform the audio blob correctly so that it can be processed with np.fft?

Answer 1

Have you tried using base64.b64decode() on it first? (base64 is in the standard lib)

It would help to get an example blob.