def graphics_listen_addrs(migrate_data):
    """Returns listen addresses of vnc/spice from a LibvirtLiveMigrateData"""
    listen_addrs = None
    if migrate_data.obj_attr_is_set('graphics_listen_addr_vnc'
        ) or migrate_data.obj_attr_is_set('graphics_listen_addr_spice'):
        listen_addrs = {'vnc': None, 'spice': None}
    if migrate_data.obj_attr_is_set('graphics_listen_addr_vnc'):
        listen_addrs['vnc'] = str(migrate_data.graphics_listen_addr_vnc)
    if migrate_data.obj_attr_is_set('graphics_listen_addr_spice'):
        listen_addrs['spice'] = str(migrate_data.graphics_listen_addr_spice)
    return listen_addrs
