def avm_obj_from_file(file_path):
"""
Function to retrieve the XMP packet from a file
:param file_path: Path to file
:return: A dictionary with AVM data
"""
xmpfile = libxmp.files.XMPFiles()
try:
xmpfile.open_file(file_path, open_option=libxmp.files.XMP_OPEN_READ)
xmp = xmpfile.get_xmp()
xmpfile.close_file()
except libxmp.XMPError:
return None
avm = libavm.AVMMeta(xmp=xmp)
return avm
def avm_to_file(file_path, dict={}, replace=False):
"""
Function to inject AVM into a file. Preserves existing XMP in the file, while replacing
fields passed through dict.
If a field is an unordered list, then data is appended to existing values
:param file_path: Path to file
:param dict: A dictionary containing AVM metadata
:param xmp: An XMPMeta instance
:param replace: Boolean to replace the exisiting XMP in the file. By default it is set to False.
:return: Boolean
.. todo:: Improve avm_to_file function. Add ability to input an XMP file
"""
xmpfile = libxmp.files.XMPFiles()
try:
xmpfile.open_file(file_path, open_forupdate=True)
except libxmp.XMPError:
return False
if replace is True:
xmp = libxmp.XMPMeta()
else:
xmp = xmpfile.get_xmp()
if xmp:
pass
else:
xmp = libxmp.XMPMeta()
avm = libavm.AVMMeta(xmp=xmp, avm_dict=dict)
if xmpfile.can_put_xmp(avm.xmp):
xmpfile.put_xmp(avm.xmp)
xmpfile.close_file()
return True
else:
return False