def test_non_conformant_raises():
"""Test that a non-conformant JPEG image raises an exception."""
ds_list = get_indexed_datasets('1.2.840.10008.1.2.4.51')
# Image has invalid Se value in the SOS marker segment
item = ds_list['JPEG-lossy.dcm']
assert 0xC000 == item['Status'][1]
ds = item['ds']
nr_frames = ds.get('NumberOfFrames', 1)
frame = next(generate_pixel_data_frame(ds.PixelData, nr_frames))
msg = (
r"libjpeg error code '-1038' returned from GetJPEGParameters\(\): A "
r"misplaced marker segment was found - scan start must be zero "
r"and scan stop must be 63 for the sequential operating modes")
with pytest.raises(RuntimeError, match=msg):
get_parameters(frame)
def test_jls(self, fname, info):
"""Test get_parameters() for the JPEG-LS compliance images."""
#info: (rows, columns, spp, bps)
with open(os.path.join(DIR_14495, 'JLS', fname), 'rb') as fp:
data = fp.read()
params = get_parameters(np.frombuffer(data, 'uint8'))
assert (info[0], info[1]) == (params['rows'], params['columns'])
assert info[2] == params["nr_components"]
assert info[3] == params["precision"]
def test_get_parameters_bytes():
"""Test get_parameters() using bytes."""
with open(os.path.join(DIR_10918, 'p1', 'A1.JPG'), 'rb') as fp:
data = fp.read()
params = get_parameters(data)
info = (257, 255, 4, 8)
assert (info[0], info[1]) == (params['rows'], params['columns'])
assert info[2] == params["nr_components"]
assert info[3] == params["precision"]
def test_extended(self, fname, info):
"""Test get_parameters() for the LS lossy datasets."""
#info: (rows, columns, spp, bps)
index = get_indexed_datasets('1.2.840.10008.1.2.4.81')
ds = index[fname]['ds']
frame = next(self.generate_frames(ds))
params = get_parameters(np.frombuffer(frame, 'uint8'))
assert (info[0], info[1]) == (params['rows'], params['columns'])
assert info[2] == params["nr_components"]
assert info[3] == params["precision"]