def get_last_segment_and_start_timestamp()

in broadcast-monitoring/src/sharedlib/common/manifest_parser.py [0:0]

• 21 lines of code
• 7 McCabe index (conditional complexity)

def get_last_segment_and_start_timestamp(manifest_content):
    """
    Parse the m3u8 manifest to retrieve the name of the last segment and its starting timestamp (absolute)
    :param manifest_content: content of the m3u8 manifest
    :return:
        segment: name of the last segment
        latest_segment_start_time: if EXT-X-PROGRAM-DATE-TIME is present in the manifest, the starting timestamp of
         the last segment
        duration_sec: duration of the last segments in seconds
    """
    manifest_lines = manifest_content.split('\n')
    latest_segment_duration = timedelta()
    segment_date_time = None
    segment = None
    for line in manifest_lines:
        if PROGRAM_TIME_KEYWORD in line:
            date_time_str = line.split(PROGRAM_TIME_KEYWORD)[-1]
            segment_date_time = datetime.strptime(date_time_str, UTC_TIME_FMT)
        if DURATION_KEYWORD in line:
            duration_sec = float(line.split(DURATION_KEYWORD)[-1].split(',')[0])
            latest_segment_duration = timedelta(seconds=duration_sec)
            if segment_date_time is not None:
                segment_date_time += latest_segment_duration
        if line.endswith(SEGMENT_SUFFIX):
            segment = line

    if segment_date_time is not None:
        # the segment duration occurs before the segment name, subtract the last segment duration to get the start time
        latest_segment_start_time = segment_date_time - latest_segment_duration
        return segment, latest_segment_start_time, duration_sec
    else:
        return segment, None, duration_sec