#!/usr/bin/env python33  
# -*- coding: utf-8 -*-  
# Encoding: UTF-8  

import os  
import argparse  
import xml.etree.ElementTree as ET  
 
"""  
Converts DLP Cinema™ XML (DCSubitle) subtitles to SubRip (.srt)  
 
Tested with Python 3.4  
 
Specification:  
    http://www.dlp.com/downloads/pdf_dlp_cinema_CineCanvas_Rev_C.pdf  
"""  
 
 
def dc_time_to_srt_time(dc_time):  
    """Returns a time representation suitable for SubRip format.  
 
    Return format: hh:mm:ss,ms  
    """  
    return '{0:}:{1:}:{2:},{3:}'.format(*dc_time.split(':'))  
 
 
def parse_dc_subtitles(xml):  
    """Returns a list of dicts with parsed subtitles."""  
    subs = {}  
    root = ET.fromstring(xml)  
    font = root.find('Font')  
    for sub in font.findall('Subtitle'):  
        attrs = sub.attrib  
        number = int(attrs['SpotNumber'])  
        start, end = attrs['TimeIn'], attrs['TimeOut']  
        subs[number] = {  
            'text': '\n'.join([text.text for text in sub.findall('Text')]),  
            'start': start,  
            'end': end,  
        }  
    return subs  
 
 
def main():  
    p = argparse.ArgumentParser()  
    p.add_argument('filename', help='path to the XML file')  
    p.add_argument('--encoding', help='encoding of the XML file')  
    args = p.parse_args()  
 
    filename = os.path.expanduser(args.filename)  
 
    with open(filename, encoding=args.encoding) as f:  
        xml = f.read()  
 
    subs = parse_dc_subtitles(xml)  
 
    for nr in sorted(subs):  
        s = subs[nr]  
        print(nr)  
        print(  
            dc_time_to_srt_time(s['start']),  
            '-->',  
            dc_time_to_srt_time(s['end'])  
        )  
        print(s['text'], end='\n\n')  
 
 
if __name__ == '__main__':  
    main()