Three to four-byte conversion

convert.py

def convert_three_byte(frame):
    data_out = np.zeros(128, dtype=np.int32)  # You're looking to make a 128-element array of int32.
    data_out.dtype = np.byte
    data_out = data_out.reshape(-1, 4)  # Shape is now (128,4) and dtype is byte
    # Now, copy the data from chans08to00 into data_out. We need to specify which bytes to put it in.
    # Also, we need to reverse the data in frame.
    # You'd change 0:3 to 1:4 if the stuff in frame is big-endian, I think? You'll need to experiment.
    data_out[0:8, 0:3] = frame['chans08to00'][::-1]
    # ... and so on with channels
    data_out.dtype = np.int32
    # The last thing that's a little messed up is that shape(data_out) is now (128,1) instead of (128,) --
    # it's become a 2-d array with the second dimension's size as 1. flatten() will fix it
    data_out = data_out.flatten
    return data_out