# Copyright (C) 2021 NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
#
# This work is made available under the Nvidia Source Code License-NC.
# To view a copy of this license, check out LICENSE.md
import numpy as np
from os.path import splitext
from scipy.misc import imread
from . import flow_utils


def read_gen(file_name):
    ext = splitext(file_name)[-1]
    if ext == '.png' or ext == '.jpeg' or ext == '.ppm' or ext == '.jpg':
        im = imread(file_name)
        if im.shape[2] > 3:
            return im[:, :, :3]
        else:
            return im
    elif ext == '.bin' or ext == '.raw':
        return np.load(file_name)
    elif ext == '.flo':
        return flow_utils.readFlow(file_name).astype(np.float32)
    return []