Multi value fields are broken (Exif.Image.Orientation)

[Olivier Tilloy]

This bug was reported by Michal Čihař <email address hidden>:

$ exiv2 -Pkyctv /tmp/xmptest.jpg | grep Image.Orientation
Exif.Image.Orientation Short 4 2 3 4 5 top, right

But this fails:
import pyexiv2

tags = pyexiv2.Image('/tmp/xmptest.jpg')
tags.readMetadata()
print tags.exifKeys()
print tags['Exif.Image.Orientation']

['Exif.Image.ImageDescription', 'Exif.Image.Make', 'Exif.Image.Model', 'Exif.Image.Orientation', 'Exif.Image.DateTime', 'Exif.Image.Artist', 'Exif.Image.Copyright', 'Exif.Image.ExifTag', 'Exif.Photo.ExposureTime', 'Exif.Photo.FNumber', 'Exif.Photo.ExposureProgram', 'Exif.Photo.ISOSpeedRatings', 'Exif.Photo.ExifVersion', 'Exif.Photo.DateTimeOriginal', 'Exif.Photo.DateTimeDigitized', 'Exif.Photo.ShutterSpeedValue', 'Exif.Photo.ApertureValue', 'Exif.Photo.ExposureBiasValue', 'Exif.Photo.MeteringMode', 'Exif.Photo.Flash', 'Exif.Photo.FocalLength', 'Exif.Photo.InteroperabilityTag', 'Exif.Photo.FocalPlaneXResolution', 'Exif.Photo.FocalPlaneYResolution', 'Exif.Photo.FocalPlaneResolutionUnit', 'Exif.Photo.CustomRendered', 'Exif.Photo.ExposureMode', 'Exif.Photo.WhiteBalance', 'Exif.Photo.SceneCaptureType', 'Exif.Iop.InteroperabilityIndex', 'Exif.Thumbnail.Orientation']
Traceback (most recent call last):
  File "/tmp/exif-test.py", line 7, in ?
    print tags['Exif.Image.Orientation']
  File "/usr/lib/python2.4/site-packages/pyexiv2.py", line 480, in __getitem__
    value = self.__getExifTagValue(key)
  File "/usr/lib/python2.4/site-packages/pyexiv2.py", line 312, in __getExifTagValue
    return int(tagValue)
ValueError: invalid literal for int(): 2 3 4 5

[Olivier Tilloy (osomon)]

According to the EXIF 2.2 specification, the image orientation tag is not supposed to hold multiple values (count = 1).
However, considering the many incomplete and buggy implementations in the wild (and the fact that the specification itself is not so clear), pyexiv2 should be able to handle this case smoothly.

Waiting for the sample faulty image to reproduce and confirm the bug.

[Michal Čihař (nijel)]

The mentioned image is available here: http://www.ivan-herman.net/Photos/xmptest.jpg

[Olivier Tilloy (osomon)]

This image does not seem to be the one originally mentioned: tag "Image.Orientation" is not set in this one:

 $ exiv2 -Pkyctv xmptest.jpg |grep Image.Orientation
 (nothing)

And indeed in pyexiv2:

>>> i=pyexiv2.Image('xmptest.jpg')
>>> i.readMetadata()
>>> i.exifKeys()
['Exif.Image.ImageDescription', 'Exif.Image.Make', 'Exif.Image.Model', 'Exif.Image.DateTime', 'Exif.Image.Artist', 'Exif.Image.Copyright', 'Exif.Image.ExifTag', 'Exif.Photo.ExposureTime', 'Exif.Photo.FNumber', 'Exif.Photo.ExposureProgram', 'Exif.Photo.ISOSpeedRatings', 'Exif.Photo.ExifVersion', 'Exif.Photo.DateTimeOriginal', 'Exif.Photo.DateTimeDigitized', 'Exif.Photo.ShutterSpeedValue', 'Exif.Photo.ApertureValue', 'Exif.Photo.ExposureBiasValue', 'Exif.Photo.MeteringMode', 'Exif.Photo.Flash', 'Exif.Photo.FocalLength', 'Exif.Photo.FocalPlaneXResolution', 'Exif.Photo.FocalPlaneYResolution', 'Exif.Photo.FocalPlaneResolutionUnit', 'Exif.Photo.CustomRendered', 'Exif.Photo.ExposureMode', 'Exif.Photo.WhiteBalance', 'Exif.Photo.SceneCaptureType']

Can you please provide the (real) faulty image? Thanks :)

[Michal Čihař (nijel)]

Sorry, I thought I downloaded it from this location. The mine file is attached now.

[Olivier Tilloy (osomon)]

Fix committed with revision 70.

[Olivier Tilloy (osomon)]

Behaviour modified in revision 79 to fix bug #183618.