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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
try:
from PIL import Image
except ImportError:
import Image
from collections import OrderedDict
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, BAD_GPS_JPG
def assert_in(a, b):
assert a in b, "{!r} not in {!r}".format(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) >= 50
# Do we have clean data?
assert len(clean) >= 50
# GPS data?
assert gps == {}
# Do we have the "useful" tags?
expected = OrderedDict({'EXIF CVAPattern': {'field_length': 8,
'field_offset': 26224,
'field_type': 7,
'printable': '[0, 2, 0, 2, 1, 2, 0, 1]',
'tag': 41730,
'values': [0, 2, 0, 2, 1, 2, 0, 1]},
'EXIF ColorSpace': {'field_length': 2,
'field_offset': 476,
'field_type': 3,
'printable': 'sRGB',
'tag': 40961,
'values': [1]},
'EXIF ComponentsConfiguration': {'field_length': 4,
'field_offset': 308,
'field_type': 7,
'printable': 'YCbCr',
'tag': 37121,
'values': [1, 2, 3, 0]},
'EXIF CompressedBitsPerPixel': {'field_length': 8,
'field_offset': 756,
'field_type': 5,
'printable': '4',
'tag': 37122,
'values': [[4, 1]]},
'EXIF Contrast': {'field_length': 2,
'field_offset': 656,
'field_type': 3,
'printable': 'Soft',
'tag': 41992,
'values': [1]},
'EXIF CustomRendered': {'field_length': 2,
'field_offset': 572,
'field_type': 3,
'printable': 'Normal',
'tag': 41985,
'values': [0]},
'EXIF DateTimeDigitized': {'field_length': 20,
'field_offset': 736,
'field_type': 2,
'printable': '2011:06:22 12:20:33',
'tag': 36868,
'values': '2011:06:22 12:20:33'},
'EXIF DateTimeOriginal': {'field_length': 20,
'field_offset': 716,
'field_type': 2,
'printable': '2011:06:22 12:20:33',
'tag': 36867,
'values': '2011:06:22 12:20:33'},
'EXIF DigitalZoomRatio': {'field_length': 8,
'field_offset': 26232,
'field_type': 5,
'printable': '1',
'tag': 41988,
'values': [[1, 1]]},
'EXIF ExifImageLength': {'field_length': 2,
'field_offset': 500,
'field_type': 3,
'printable': '2592',
'tag': 40963,
'values': [2592]},
'EXIF ExifImageWidth': {'field_length': 2,
'field_offset': 488,
'field_type': 3,
'printable': '3872',
'tag': 40962,
'values': [3872]},
'EXIF ExifVersion': {'field_length': 4,
'field_offset': 272,
'field_type': 7,
'printable': '0221',
'tag': 36864,
'values': [48, 50, 50, 49]},
'EXIF ExposureBiasValue': {'field_length': 8,
'field_offset': 764,
'field_type': 10,
'printable': '0',
'tag': 37380,
'values': [[0, 1]]},
'EXIF ExposureMode': {'field_length': 2,
'field_offset': 584,
'field_type': 3,
'printable': 'Manual Exposure',
'tag': 41986,
'values': [1]},
'EXIF ExposureProgram': {'field_length': 2,
'field_offset': 248,
'field_type': 3,
'printable': 'Manual',
'tag': 34850,
'values': [1]},
'EXIF ExposureTime': {'field_length': 8,
'field_offset': 700,
'field_type': 5,
'printable': '1/125',
'tag': 33434,
'values': [[1, 125]]},
'EXIF FNumber': {'field_length': 8,
'field_offset': 708,
'field_type': 5,
'printable': '10',
'tag': 33437,
'values': [[10, 1]]},
'EXIF FileSource': {'field_length': 1,
'field_offset': 536,
'field_type': 7,
'printable': 'Digital Camera',
'tag': 41728,
'values': [3]},
'EXIF Flash': {'field_length': 2,
'field_offset': 380,
'field_type': 3,
'printable': 'Flash did not fire',
'tag': 37385,
'values': [0]},
'EXIF FlashPixVersion': {'field_length': 4,
'field_offset': 464,
'field_type': 7,
'printable': '0100',
'tag': 40960,
'values': [48, 49, 48, 48]},
'EXIF FocalLength': {'field_length': 8,
'field_offset': 780,
'field_type': 5,
'printable': '18',
'tag': 37386,
'values': [[18, 1]]},
'EXIF FocalLengthIn35mmFilm': {'field_length': 2,
'field_offset': 620,
'field_type': 3,
'printable': '27',
'tag': 41989,
'values': [27]},
'EXIF GainControl': {'field_length': 2,
'field_offset': 644,
'field_type': 3,
'printable': 'None',
'tag': 41991,
'values': [0]},
'EXIF ISOSpeedRatings': {'field_length': 2,
'field_offset': 260,
'field_type': 3,
'printable': '100',
'tag': 34855,
'values': [100]},
'EXIF InteroperabilityOffset': {'field_length': 4,
'field_offset': 512,
'field_type': 4,
'printable': '26240',
'tag': 40965,
'values': [26240]},
'EXIF LightSource': {'field_length': 2,
'field_offset': 368,
'field_type': 3,
'printable': 'Unknown',
'tag': 37384,
'values': [0]},
'EXIF MaxApertureValue': {'field_length': 8,
'field_offset': 772,
'field_type': 5,
'printable': '18/5',
'tag': 37381,
'values': [[18, 5]]},
'EXIF MeteringMode': {'field_length': 2,
'field_offset': 356,
'field_type': 3,
'printable': 'Pattern',
'tag': 37383,
'values': [5]},
'EXIF Saturation': {'field_length': 2,
'field_offset': 668,
'field_type': 3,
'printable': 'Normal',
'tag': 41993,
'values': [0]},
'EXIF SceneCaptureType': {'field_length': 2,
'field_offset': 632,
'field_type': 3,
'printable': 'Standard',
'tag': 41990,
'values': [0]},
'EXIF SceneType': {'field_length': 1,
'field_offset': 548,
'field_type': 7,
'printable': 'Directly Photographed',
'tag': 41729,
'values': [1]},
'EXIF SensingMethod': {'field_length': 2,
'field_offset': 524,
'field_type': 3,
'printable': 'One-chip color area',
'tag': 41495,
'values': [2]},
'EXIF Sharpness': {'field_length': 2,
'field_offset': 680,
'field_type': 3,
'printable': 'Normal',
'tag': 41994,
'values': [0]},
'EXIF SubSecTime': {'field_length': 3,
'field_offset': 428,
'field_type': 2,
'printable': '10',
'tag': 37520,
'values': '10'},
'EXIF SubSecTimeDigitized': {'field_length': 3,
'field_offset': 452,
'field_type': 2,
'printable': '10',
'tag': 37522,
'values': '10'},
'EXIF SubSecTimeOriginal': {'field_length': 3,
'field_offset': 440,
'field_type': 2,
'printable': '10',
'tag': 37521,
'values': '10'},
'EXIF SubjectDistanceRange': {'field_length': 2,
'field_offset': 692,
'field_type': 3,
'printable': '0',
'tag': 41996,
'values': [0]},
'EXIF WhiteBalance': {'field_length': 2,
'field_offset': 596,
'field_type': 3,
'printable': 'Auto',
'tag': 41987,
'values': [0]},
'Image DateTime': {'field_length': 20,
'field_offset': 194,
'field_type': 2,
'printable': '2011:06:22 12:20:33',
'tag': 306,
'values': '2011:06:22 12:20:33'},
'Image ExifOffset': {'field_length': 4,
'field_offset': 126,
'field_type': 4,
'printable': '214',
'tag': 34665,
'values': [214]},
'Image Make': {'field_length': 18,
'field_offset': 134,
'field_type': 2,
'printable': 'NIKON CORPORATION',
'tag': 271,
'values': 'NIKON CORPORATION'},
'Image Model': {'field_length': 10,
'field_offset': 152,
'field_type': 2,
'printable': 'NIKON D80',
'tag': 272,
'values': 'NIKON D80'},
'Image Orientation': {'field_length': 2,
'field_offset': 42,
'field_type': 3,
'printable': 'Rotated 90 CW',
'tag': 274,
'values': [6]},
'Image ResolutionUnit': {'field_length': 2,
'field_offset': 78,
'field_type': 3,
'printable': 'Pixels/Inch',
'tag': 296,
'values': [2]},
'Image Software': {'field_length': 15,
'field_offset': 178,
'field_type': 2,
'printable': 'Shotwell 0.9.3',
'tag': 305,
'values': 'Shotwell 0.9.3'},
'Image XResolution': {'field_length': 8,
'field_offset': 162,
'field_type': 5,
'printable': '300',
'tag': 282,
'values': [[300, 1]]},
'Image YCbCrPositioning': {'field_length': 2,
'field_offset': 114,
'field_type': 3,
'printable': 'Co-sited',
'tag': 531,
'values': [2]},
'Image YResolution': {'field_length': 8,
'field_offset': 170,
'field_type': 5,
'printable': '300',
'tag': 283,
'values': [[300, 1]]},
'Thumbnail Compression': {'field_length': 2,
'field_offset': 26280,
'field_type': 3,
'printable': 'JPEG (old-style)',
'tag': 259,
'values': [6]},
'Thumbnail ResolutionUnit': {'field_length': 2,
'field_offset': 26316,
'field_type': 3,
'printable': 'Pixels/Inch',
'tag': 296,
'values': [2]},
'Thumbnail XResolution': {'field_length': 8,
'field_offset': 26360,
'field_type': 5,
'printable': '300',
'tag': 282,
'values': [[300, 1]]},
'Thumbnail YCbCrPositioning': {'field_length': 2,
'field_offset': 26352,
'field_type': 3,
'printable': 'Co-sited',
'tag': 531,
'values': [2]},
'Thumbnail YResolution': {'field_length': 8,
'field_offset': 26368,
'field_type': 5,
'printable': '300',
'tag': 283,
'values': [[300, 1]]}})
for key in expected.keys():
assert useful[key] == expected[key]
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 in ((428, 640), (640, 428))
# If this pixel looks right, the rest of the image probably will too.
# It seems different values are being seen on different platforms/systems
# as of ccca39f1 it seems we're adding to the list those which are seen.
assert_in(image.getdata()[10000],
((37, 23, 14), (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}
def test_exif_bad_gps_data():
'''
Test extraction of GPS data from an image with bad GPS data
'''
result = extract_exif(BAD_GPS_JPG)
gps = get_gps_data(result)
print(gps)
assert gps == {
'latitude': 0.0,
'direction': 0.0,
'altitude': 0.0,
'longitude': 0.0}
|
