How to use flask to receive wav file and load it with librosa?

Question

I received a wav file from the front end and got a FileStorage object with request.files.get('file'). How can I load it in librosa?

audio = request.files.get('file')
data, sampling_rate = librosa.load(audio)

and the error below showed
TypeError: expected str, bytes or os.PathLike object, not FileStorage

I tried to use read() function

audio = request.files.get('file').read()

but it still doesn't work
ValueError: _getfinalpathname: embedded null character in path

Answer 1

librosa uses soundfile and audioread to read audio, but expects a path to the audio file. If you want to read audio from file-like objects you can use soundfile as well. You can find the documentation for this here.

import soundfile as sf
import io

# ...

@app.route('/upload', methods=['GET', 'POST'])
def upload():
    if request.method == 'POST':
        file = request.files.get('file')
        if file:
            tmp = io.BytesIO(file.read())
            data, samplerate = sf.read(tmp)
            
            # ...

    return render_template('upload.html')