def get(self):
"""Returns GPS position information or None, if not present"""
proc = Popen(["exiv2",
"-g", "Exif.GPSInfo.GPSAltitude",
"-g", "Exif.GPSInfo.GPSAltitudeRef",
"-g", "Exif.GPSInfo.GPSLatitude",
"-g", "Exif.GPSInfo.GPSLatitudeRef",
"-g", "Exif.GPSInfo.GPSLongitude",
"-g", "Exif.GPSInfo.GPSLongitudeRef",
"-g", "Exif.GPSInfo.GPSMapDatum",
"-g", "Exif.GPSInfo.GPSVersionID",
self._file_name], stdout=PIPE, universal_newlines=True)
res = proc.communicate()[0]
if proc.returncode is not 0 and proc.returncode is not 253:
raise ExivGps.ExivError("Nonzero stare returnet from cmd: %s" % repr(proc.returncode))
lines = res.splitlines()
gps_lat = gps_lat_ref = None
gps_lon = gps_lon_ref = None
for line in lines:
line = [l for l in line.split(' ') if l]
line = line[0:3] + [' '.join(line[3:]), ]
tag, form, num, val = line
if tag == "Exif.GPSInfo.GPSLatitude":
gps_lat = Gps._degreesFromString(val.replace('deg', '°'))
elif tag == "Exif.GPSInfo.GPSLatitudeRef":
gps_lat_ref = {'North': 'N', 'South': 'S', }[val]
elif tag == "Exif.GPSInfo.GPSLongitude":
gps_lon = Gps._degreesFromString(val.replace('deg', '°'))
elif tag == "Exif.GPSInfo.GPSLongitudeRef":
gps_lon_ref = {'East': 'E', 'West': 'W', }[val]
elif tag == "Exif.GPSInfo.GPSAltitude":
gps_alt = val
elif tag == "Exif.GPSInfo.GPSVersionID":
if val < "2.0.0.0":
raise ValueError("Unsupported GPSInfo version '%s'" % val)
elif tag == "Exif.GPSInfo.GPSMapDatum":
if val != "WGS-84":
raise ValueError("Unsupported GPSInfo Datum '%s'" % val)
else:
raise ValueError("Invalid exiv2 resutl: %s" % repr(res))
gps = Gps()
if gps_lat or gps_lat_ref:
gps.setLatitude(gps_lat, gps_lat_ref)
if gps_lon or gps_lon_ref:
gps.setLongtitude(gps_lon, gps_lon_ref)
return gps
