class UTCTiming:

    # Mapping between values used in configuration files and actual
    # strings required by the spec
    SUPPORTED_UTC_SCHEMES = {
        'ntp':          'urn:mpeg:dash:utc:ntp:2014',
        'sntp':         'urn:mpeg:dash:utc:sntp:2014',
        'http-head':    'urn:mpeg:dash:utc:http-head:2014',
        'http-xsdate':  'urn:mpeg:dash:utc:http-xsdate:2014',
        'http-iso':     'urn:mpeg:dash:utc:http-iso:2014',
        'http-ntp':     'urn:mpeg:dash:utc:http-ntp:2014',
        'direct':       'urn:mpeg:dash:utc:direct:2014'
    }
