import sys

def decode_audio_file(input_path, output_path):
    with open(input_path, "rb") as f:
        data = bytearray(f.read())

    # XOR the first four bytes
    key = [0x06, 0x23, 0x54, 0x0f]
    for i in range(4):
        data[i] ^= key[i]

    with open(output_path, "wb") as f:
        f.write(data)

    print(f"Decoded file saved as: {output_path}")

if __name__ == "__main__":
    if len(sys.argv) != 3:
        print("Usage: python decode_audio.py input_file output_file")
        sys.exit(1)

    decode_audio_file(sys.argv[1], sys.argv[2])