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# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import Image
from mediagoblin.tools.exif import exif_fix_image_orientation, \
extract_exif, clean_exif, get_gps_data, get_useful
from .resources import GOOD_JPG, EMPTY_JPG, BAD_JPG, GPS_JPG
def assert_in(a, b):
assert a in b, "%r not in %r" % (a, b)
def test_exif_extraction():
'''
Test EXIF extraction from a good image
'''
result = extract_exif(GOOD_JPG)
clean = clean_exif(result)
useful = get_useful(clean)
gps = get_gps_data(result)
# Do we have the result?
assert len(result) == 56
# Do we have clean data?
assert len(clean) == 53
# GPS data?
assert gps == {}
# Do we have the "useful" tags?
assert useful == {
'EXIF Flash': {
'field_type': 3,
'printable': u'Flash did not fire',
'field_offset': 380,
'tag': 37385,
'values': [0],
'field_length': 2},
'EXIF ExposureTime': {
'field_type': 5,
'printable': '1/125',
'field_offset': 700,
'tag': 33434,
'values': [[1, 125]],
'field_length': 8},
'EXIF FocalLength': {
'field_type': 5,
'printable': '18',
'field_offset': 780,
'tag': 37386,
'values': [[18, 1]],
'field_length': 8},
'Image Model': {
'field_type': 2,
'printable': 'NIKON D80',
'field_offset': 152,
'tag': 272,
'values': 'NIKON D80',
'field_length': 10},
'Image Make': {
'field_type': 2,
'printable': 'NIKON CORPORATION',
'field_offset': 134,
'tag': 271,
'values': 'NIKON CORPORATION',
'field_length': 18},
'EXIF ExposureMode': {
'field_type': 3,
'printable': 'Manual Exposure',
'field_offset': 584,
'tag': 41986,
'values': [1],
'field_length': 2},
'EXIF ISOSpeedRatings': {
'field_type': 3,
'printable': '100',
'field_offset': 260,
'tag': 34855,
'values': [100],
'field_length': 2},
'EXIF FNumber': {
'field_type': 5,
'printable': '10',
'field_offset': 708,
'tag': 33437,
'values': [[10, 1]],
'field_length': 8}}
def test_exif_image_orientation():
'''
Test image reorientation based on EXIF data
'''
result = extract_exif(GOOD_JPG)
image = exif_fix_image_orientation(
Image.open(GOOD_JPG),
result)
# Are the dimensions correct?
assert image.size == (428, 640)
# If this pixel looks right, the rest of the image probably will too.
assert_in(image.getdata()[10000],
((41, 28, 11), (43, 27, 11))
)
def test_exif_no_exif():
'''
Test an image without exif
'''
result = extract_exif(EMPTY_JPG)
clean = clean_exif(result)
useful = get_useful(clean)
gps = get_gps_data(result)
assert result == {}
assert clean == {}
assert gps == {}
assert useful == {}
def test_exif_bad_image():
'''
Test EXIF extraction from a faithful, but bad image
'''
result = extract_exif(BAD_JPG)
clean = clean_exif(result)
useful = get_useful(clean)
gps = get_gps_data(result)
assert result == {}
assert clean == {}
assert gps == {}
assert useful == {}
def test_exif_gps_data():
'''
Test extractiion of GPS data
'''
result = extract_exif(GPS_JPG)
gps = get_gps_data(result)
assert gps == {
'latitude': 59.336666666666666,
'direction': 25.674046740467404,
'altitude': 37.64365671641791,
'longitude': 18.016166666666667}
|
