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import os |
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import io |
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import wave |
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import struct |
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from flask import Flask, render_template, request, send_file, jsonify |
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from werkzeug.utils import secure_filename |
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app = Flask(__name__) |
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UPLOAD_FOLDER = '/tmp' |
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ALLOWED_EXTENSIONS = {'mp3', 'wav'} |
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app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER |
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def allowed_file(filename): |
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return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS |
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@app.route('/') |
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def index(): |
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return render_template('index.html') |
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@app.route('/process', methods=['POST']) |
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def process_file(): |
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if 'file' not in request.files: |
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return jsonify({'error': 'No file part'}), 400 |
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file = request.files['file'] |
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if file.filename == '': |
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return jsonify({'error': 'No selected file'}), 400 |
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if file and allowed_file(file.filename): |
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filename = secure_filename(file.filename) |
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filepath = os.path.join(app.config['UPLOAD_FOLDER'], filename) |
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file.save(filepath) |
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factor = int(request.form['factor']) |
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is_decrypting = filename.lower().endswith('.mp3') |
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try: |
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if is_decrypting: |
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output = deconvert_file(filepath, factor) |
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output_filename = 'deconverted_file.wav' |
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mimetype = 'audio/wav' |
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else: |
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output = convert_file(filepath, factor) |
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output_filename = 'converted_file.mp3' |
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mimetype = 'audio/mpeg' |
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os.remove(filepath) |
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return send_file( |
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io.BytesIO(output), |
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mimetype=mimetype, |
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as_attachment=True, |
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download_name=output_filename |
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) |
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except Exception as e: |
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os.remove(filepath) |
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return jsonify({'error': str(e)}), 500 |
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return jsonify({'error': 'Invalid file type'}), 400 |
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def convert_file(filepath, factor): |
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with wave.open(filepath, 'rb') as wav_file: |
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params = wav_file.getparams() |
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frames = wav_file.readframes(wav_file.getnframes()) |
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audio_data = struct.unpack(f'{len(frames)//params.sampwidth}h', frames) |
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modified_data = [int(sample * factor / 100) for sample in audio_data] |
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output = io.BytesIO() |
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with wave.open(output, 'wb') as wav_output: |
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wav_output.setparams(params) |
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wav_output.writeframes(struct.pack(f'{len(modified_data)}h', *modified_data)) |
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return output.getvalue() |
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def deconvert_file(filepath, factor): |
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with wave.open(filepath, 'rb') as wav_file: |
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params = wav_file.getparams() |
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frames = wav_file.readframes(wav_file.getnframes()) |
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audio_data = struct.unpack(f'{len(frames)//params.sampwidth}h', frames) |
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modified_data = [int(sample * 100 / factor) for sample in audio_data] |
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output = io.BytesIO() |
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with wave.open(output, 'wb') as wav_output: |
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wav_output.setparams(params) |
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wav_output.writeframes(struct.pack(f'{len(modified_data)}h', *modified_data)) |
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return output.getvalue() |
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if __name__ == '__main__': |
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app.run(debug=True) |
