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Diffstat (limited to 'mediagoblin/tests/test_exif.py')
| -rw-r--r-- | mediagoblin/tests/test_exif.py | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/mediagoblin/tests/test_exif.py b/mediagoblin/tests/test_exif.py new file mode 100644 index 00000000..9f2219c0 --- /dev/null +++ b/mediagoblin/tests/test_exif.py @@ -0,0 +1,189 @@ +# GNU MediaGoblin -- federated, autonomous media hosting +# Copyright (C) 2011 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 pkg_resources +import Image + +from mediagoblin.tools.exif import exif_fix_image_orientation, \ + extract_exif, clean_exif, get_gps_data, get_useful + +GOOD_JPG = pkg_resources.resource_filename( + 'mediagoblin.tests', + os.path.join( + 'test_exif', + 'good.jpg')) +EMPTY_JPG = pkg_resources.resource_filename( + 'mediagoblin.tests', + os.path.join( + 'test_exif', + 'empty.jpg')) +BAD_JPG = pkg_resources.resource_filename( + 'mediagoblin.tests', + os.path.join( + 'test_exif', + 'bad.jpg')) +GPS_JPG = pkg_resources.resource_filename( + 'mediagoblin.tests', + os.path.join( + 'test_exif', + 'has-gps.jpg')) + +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) == 108 + + # Do we have clean data? + assert len(clean) == 105 + + # GPS data? + assert gps == {} + + # Do we have the "useful" tags? + assert useful == { + 'EXIF Flash': { + 'field_type': 3, + 'printable': 'No', + '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}, + 'EXIF UserComment': { + 'field_type': 7, + 'printable': 'Joar Wandborg ', + 'field_offset': 26180, + 'tag': 37510, + 'values': [ + 65, 83, 67, 73, 73, 0, 0, 0, 74, 111, 97, 114, 32, 87, + 97, 110, 100, 98, 111, 114, 103, 32, 32, 32, 32, 32, 32, + 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, + 32, 32, 32], + 'field_length': 44}} + +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 image.getdata()[10000] == (41, 28, 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} + |