processing.py

import time

def tuple_to_sequence(lst, width, shift):
    """Convert [(strt, stp, val)] to sequence of val.
    
    Args:
        lst (list): start and stop times of each val.
        width (numeric): window width in ms.
        shift (numeric): window shift in ms.
    
    Returns:
        list: sequence of vals corresponding to the tuples in lst.
    """
    lst = sorted(lst)
    seq = []
    last_frame = (lst[-1][1] - width) / shift
    frame_id = 0
    ind = 0
    
    try:
        start_time = time.time()
        while (frame_id * shift) < (last_frame * shift) and ind < len(lst):
            if lst[ind][1] >= (frame_id * shift) >= lst[ind][0]:
                while (frame_id * shift) < lst[ind][1]:
                    seq.append(lst[ind][2])
                    frame_id += 1
                ind += 1
            else:
                while (frame_id * shift) < lst[ind][0]:
                    seq.append(None)
                    frame_id += 1
                    if (frame_id * shift) >= (last_frame * shift):
                        return seq
            elapsed_time = time.time() - start_time
            if elapsed_time > 10:  
                raise TimeoutError("Generating the sequence took too long.")
    except TimeoutError as e:
        # print(f"Timeout Error: {e}")
        seq = [None] * len(lst)
        pass
    #print("Sequence", seq)
    return seq