Create app.py

app.py

@@ -0,0 +1,85 @@
+import os
+import io
+import wave
+import struct
+from flask import Flask, render_template, request, send_file, jsonify
+from werkzeug.utils import secure_filename
+
+app = Flask(__name__)
+
+UPLOAD_FOLDER = '/tmp'
+ALLOWED_EXTENSIONS = {'mp3', 'wav'}
+
+app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
+
+def allowed_file(filename):
+    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
+
+@app.route('/')
+def index():
+    return render_template('index.html')
+
+@app.route('/process', methods=['POST'])
+def process_file():
+    if 'file' not in request.files:
+        return jsonify({'error': 'No file part'}), 400
+    file = request.files['file']
+    if file.filename == '':
+        return jsonify({'error': 'No selected file'}), 400
+    if file and allowed_file(file.filename):
+        filename = secure_filename(file.filename)
+        filepath = os.path.join(app.config['UPLOAD_FOLDER'], filename)
+        file.save(filepath)
+
+        factor = int(request.form['factor'])
+        is_decrypting = filename.lower().endswith('.mp3')
+
+        if is_decrypting:
+            output = deconvert_file(filepath, factor)
+            output_filename = 'deconverted_file.wav'
+        else:
+            output = convert_file(filepath, factor)
+            output_filename = 'converted_file.mp3'
+
+        os.remove(filepath)
+
+        return send_file(
+            io.BytesIO(output),
+            mimetype='audio/mpeg' if not is_decrypting else 'audio/wav',
+            as_attachment=True,
+            download_name=output_filename
+        )
+    return jsonify({'error': 'Invalid file type'}), 400
+
+def convert_file(filepath, factor):
+    with wave.open(filepath, 'rb') as wav_file:
+        params = wav_file.getparams()
+        frames = wav_file.readframes(wav_file.getnframes())
+    
+    audio_data = struct.unpack(f'{len(frames)//2}h', frames)
+    modified_data = [int(sample * factor / 100) for sample in audio_data]
+    
+    output = io.BytesIO()
+    with wave.open(output, 'wb') as wav_output:
+        wav_output.setparams(params)
+        wav_output.writeframes(struct.pack(f'{len(modified_data)}h', *modified_data))
+    
+    return output.getvalue()
+
+def deconvert_file(filepath, factor):
+    with wave.open(filepath, 'rb') as wav_file:
+        params = wav_file.getparams()
+        frames = wav_file.readframes(wav_file.getnframes())
+    
+    audio_data = struct.unpack(f'{len(frames)//2}h', frames)
+    modified_data = [int(sample * 100 / factor) for sample in audio_data]
+    
+    output = io.BytesIO()
+    with wave.open(output, 'wb') as wav_output:
+        wav_output.setparams(params)
+        wav_output.writeframes(struct.pack(f'{len(modified_data)}h', *modified_data))
+    
+    return output.getvalue()
+
+if __name__ == '__main__':
+    app.run(debug=True)