Dump metadata from panorama photos shot by Photosphere App

photosphere_xmp.py

#!/usr/bin/env python

"""

Dump metadata from panorama photos shot by Photosphere App

Usage

@author: @CodeColorist
@site: http://chichou.0ginr.com/blog

Photo Sphere XMP Metadata document
https://developers.google.com/photo-sphere/metadata/

"""


import xml.etree.ElementTree as ET
import json
import sys
from PIL import Image, ExifTags


def parse(val):
    """parse literal to actual value"""
    literal = {
        'True': True,
        'False': False
    }
    if val in literal:
        return literal.get(val)
    elif val.isdigit():
        return int(val)
    else:
        try:
            return float(val)
        except ValueError:
            return val

def dump_meta(filename, format='json'):
    ns = {
        'GPano': 'http://ns.google.com/photos/1.0/panorama/',
        'rdf': 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'
    }
    
    with Image.open(filename) as im:
        metainfo = {
            ExifTags.TAGS[k]: v
            for k, v in im._getexif().items()
            if k in ExifTags.TAGS
        }
    
        pano_prefix = '{%s}' % ns['GPano']
        
        for segment, content in im.applist:
            marker, body = content.split('\x00', 1)
            # XMP
            if segment == 'APP1' and marker == 'http://ns.adobe.com/xap/1.0/':
                root = ET.fromstring(body)
                node = root.find('rdf:RDF', ns).find('rdf:Description', ns)            
                metainfo.update({key[len(pano_prefix):]: parse(node.get(key)) 
                    for key in node.keys() if key.startswith(pano_prefix)})
    
    if format == 'json':
        return json.dumps(metainfo, sort_keys=True, separators=(',', ': '), indent=2)
    elif format == 'text':
        return '\n'.join(['{0:32} {1}'.format(item, metainfo[item]) for item in metainfo]) 
    else:
        raise ValueError('Invalid format: %s' % format)
        
        
if __name__ == '__main__':
    argc = len(sys.argv)
    if argc in (2, 3):
        print_in_json = 'json' if sys.argv[1] == '--json' else 'text'
        report = dump_meta(sys.argv[argc - 1], format=print_in_json)    
        sys.stdout.write(report)
        
    else:
        sys.stderr.write('Usage: %s [--json] FILENAME\n' % sys.argv[0])