def extract_capture_time()

in opensfm/exif.py [0:0]

• 76 lines of code
• 11 McCabe index (conditional complexity)

    def extract_capture_time(self):
        if (
            "GPS GPSDate" in self.tags
            and "GPS GPSTimeStamp" in self.tags  # Actually GPSDateStamp
        ):
            try:
                hours = int(get_tag_as_float(self.tags, "GPS GPSTimeStamp", 0))
                minutes = int(get_tag_as_float(self.tags, "GPS GPSTimeStamp", 1))
                seconds = get_tag_as_float(self.tags, "GPS GPSTimeStamp", 2)
                gps_timestamp_string = "{0:s} {1:02d}:{2:02d}:{3:02f}".format(
                    self.tags["GPS GPSDate"].values, hours, minutes, seconds
                )
                return (
                    datetime.datetime.strptime(
                        gps_timestamp_string, "%Y:%m:%d %H:%M:%S.%f"
                    )
                    - datetime.datetime(1970, 1, 1)
                ).total_seconds()
            except (TypeError, ValueError):
                logger.info(
                    'The GPS time stamp in image file "{0:s}" is invalid. '
                    "Falling back to DateTime*".format(self.fileobj_name)
                )

        time_strings = [
            ("EXIF DateTimeOriginal", "EXIF SubSecTimeOriginal", "EXIF Tag 0x9011"),
            ("EXIF DateTimeDigitized", "EXIF SubSecTimeDigitized", "EXIF Tag 0x9012"),
            ("Image DateTime", "Image SubSecTime", "Image Tag 0x9010"),
        ]
        for datetime_tag, subsec_tag, offset_tag in time_strings:
            if datetime_tag in self.tags:
                date_time = self.tags[datetime_tag].values
                if subsec_tag in self.tags:
                    subsec_time = self.tags[subsec_tag].values
                else:
                    subsec_time = "0"
                try:
                    s = "{0:s}.{1:s}".format(date_time, subsec_time)
                    d = datetime.datetime.strptime(s, "%Y:%m:%d %H:%M:%S.%f")
                except ValueError:
                    logger.debug(
                        'The "{1:s}" time stamp or "{2:s}" tag is invalid in '
                        'image file "{0:s}"'.format(
                            self.fileobj_name, datetime_tag, subsec_tag
                        )
                    )
                    continue
                # Test for OffsetTimeOriginal | OffsetTimeDigitized | OffsetTime
                if offset_tag in self.tags:
                    offset_time = self.tags[offset_tag].values
                    try:
                        d += datetime.timedelta(
                            hours=-int(offset_time[0:3]), minutes=int(offset_time[4:6])
                        )
                    except (TypeError, ValueError):
                        logger.debug(
                            'The "{0:s}" time zone offset in image file "{1:s}"'
                            " is invalid".format(offset_tag, self.fileobj_name)
                        )
                        logger.debug(
                            'Naively assuming UTC on "{0:s}" in image file '
                            '"{1:s}"'.format(datetime_tag, self.fileobj_name)
                        )
                else:
                    logger.debug(
                        "No GPS time stamp and no time zone offset in image "
                        'file "{0:s}"'.format(self.fileobj_name)
                    )
                    logger.debug(
                        'Naively assuming UTC on "{0:s}" in image file "{1:s}"'.format(
                            datetime_tag, self.fileobj_name
                        )
                    )
                return (d - datetime.datetime(1970, 1, 1)).total_seconds()
        logger.info(
            'Image file "{0:s}" has no valid time stamp'.format(self.fileobj_name)
        )
        return 0.0