Offline speech recognition vosk

def offline_speech_to_text(filename):
    config = recognize.Model(model='model')
    recognizer = recognize.StreamingRecognizer(config=config, sample_rate=16000)
    wf = wave.open(filename)
    while True:
        buf = wf.readframes(1024)
        if buf:
            recognizer.accept_audio(buf)
        else:
            break
    hypotheses = recognizer.result()
    return hypotheses[0].lower() if hypotheses else ""