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#!/usr/bin/env python
# -*- encoding=utf8 -*-
#
# stl2srt A program to convert EBU STL subtitle files in the more common SRT format
#
# Copyright (C) 2011 Yann Coupin
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
import struct
import codecs
import logging
import unicodedata
class SRT:
'''A class that behaves like a file object and writes an SRT file'''
def __init__(self, pathOrFile):
if isinstance(pathOrFile, file):
self.file = pathOrFile
else:
self.file = open(pathOrFile, 'wb')
self.counter = 1
self.file.write(codecs.BOM_UTF8)
def _formatTime(self, timestamp):
return "%02u:%02u:%02u,%03u" % (
timestamp / 3600,
(timestamp / 60) % 60,
timestamp % 60,
(timestamp * 1000) % 1000
)
def write(self, start, end, text):
text = "\n".join(filter(lambda (x): bool(x), text.split("\n")))
self.file.write("%0u\n%s --> %s\n%s\n\n" % (self.counter, self._formatTime(start), self._formatTime(end), text.encode('utf8')))
self.counter += 1
class iso6937(codecs.Codec):
'''A class to implement the somewhat exotic iso-6937 encoding which STL files often use'''
identical = set(range(0x20, 0x7e))
identical |= set((0xa0, 0xa1, 0xa2, 0xa3, 0xa5, 0xa7, 0xab, 0xb0, 0xb1, 0xb2, 0xb3, 0xb5, 0xb6, 0xb7, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf))
direct_mapping = {
0x8a: 0x000a, # line break
0xa8: 0x00a4, # ¤
0xa9: 0x2018, # ‘
0xaa: 0x201C, # “
0xab: 0x00AB, # «
0xac: 0x2190, # ←
0xad: 0x2191, # ↑
0xae: 0x2192, # →
0xaf: 0x2193, # ↓
0xb4: 0x00D7, # ×
0xb8: 0x00F7, # ÷
0xb9: 0x2019, # ’
0xba: 0x201D, # ”
0xbc: 0x00BC, # ¼
0xbd: 0x00BD, # ½
0xbe: 0x00BE, # ¾
0xbf: 0x00BF, # ¿
0xd0: 0x2015, # ―
0xd1: 0x00B9, # ¹
0xd2: 0x00AE, # ®
0xd3: 0x00A9, # ©
0xd4: 0x2122, # ™
0xd5: 0x266A, # ♪
0xd6: 0x00AC, # ¬
0xd7: 0x00A6, # ¦
0xdc: 0x215B, # ⅛
0xdd: 0x215C, # ⅜
0xde: 0x215D, # ⅝
0xdf: 0x215E, # ⅞
0xe0: 0x2126, # Ohm Ω
0xe0: 0x00C6, # Æ
0xe0: 0x0110, # Đ
0xe0: 0x00AA, # ª
0xe0: 0x0126, # Ħ
0xe0: 0x0132, # IJ
0xe0: 0x013F, # Ŀ
0xe0: 0x0141, # Ł
0xe0: 0x00D8, # Ø
0xe0: 0x0152, # Œ
0xe0: 0x00BA, # º
0xe0: 0x00DE, # Þ
0xe0: 0x0166, # Ŧ
0xe0: 0x014A, # Ŋ
0xe0: 0x0149, # ʼn
0xf0: 0x0138, # ĸ
0xf0: 0x00E6, # æ
0xf0: 0x0111, # đ
0xf0: 0x00F0, # ð
0xf0: 0x0127, # ħ
0xf0: 0x0131, # ı
0xf0: 0x0133, # ij
0xf0: 0x0140, # ŀ
0xf0: 0x0142, # ł
0xf0: 0x00F8, # ø
0xf0: 0x0153, # œ
0xf0: 0x00DF, # ß
0xf0: 0x00FE, # þ
0xf0: 0x0167, # ŧ
0xf0: 0x014B, # ŋ
0xf0: 0x00AD, # Soft hyphen
}
diacritic = {
0xc1: 0x0300, # grave accent
0xc2: 0x0301, # acute accent
0xc3: 0x0302, # circumflex
0xc4: 0x0303, # tilde
0xc5: 0x0304, # macron
0xc6: 0x0306, # breve
0xc7: 0x0307, # dot
0xc8: 0x0308, # umlaut
0xca: 0x030A, # ring
0xcb: 0x0327, # cedilla
0xcd: 0x030B, # double acute accent
0xce: 0x0328, # ogonek
0xcf: 0x030C, # caron
}
def decode(self, input):
output = []
state = None
count = 0
for char in input:
char = ord(char)
# End of a subtitle text
if char == 0x8f:
break
count += 1
if not state and char in range(0x20, 0x7e):
output.append(char)
elif not state and char in self.direct_mapping:
output.append(self.direct_mapping[char])
elif not state and char in self.diacritic:
state = self.diacritic[char]
elif state:
combined = unicodedata.normalize('NFC', unichr(char) + unichr(state))
if combined and len(combined) == 1:
output.append(ord(combined))
state = None
return (''.join(map(unichr, output)), len(input))
def search(self, name):
if name in ('iso6937', 'iso_6937-2'):
return codecs.CodecInfo(self.encode, self.decode, name='iso_6937-2')
def encode(self, input):
pass
codecs.register(iso6937().search)
class STL:
'''A class that behaves like a file object and reads an STL file'''
GSIfields = 'CPN DFC DSC CCT LC OPT OET TPT TET TN TCD SLR CD RD RN TNB TNS TNG MNC MNR TCS TCP TCF TND DSN CO PUB EN ECD UDA'.split(' ')
TTIfields = 'SGN SN EBN CS TCIh TCIm TCIs TCIf TCOh TCOm TCOs TCOf VP JC CF TF'.split(' ')
def __init__(self, pathOrFile):
if isinstance(pathOrFile, file):
self.file = pathOrFile
else:
self.file = open(pathOrFile, 'rb')
self._readGSI()
def _readGSI(self):
self.GSI = dict(zip(
self.GSIfields,
struct.unpack('3s8sc2s2s32s32s32s32s32s32s16s6s6s2s5s5s3s2s2s1s8s8s1s1s3s32s32s32s75x576s', self.file.read(1024))
))
GSI = self.GSI
logging.debug(GSI)
#self.gsiCodePage = 'cp%s' % GSI['CPN']
if GSI['DFC'] == 'STL25.01':
self.fps = 25
elif GSI['DFC'] == 'STL30.01':
self.fps = 30
else:
raise Exception('Invalid CPN')
self.codePage = {
'00': 'iso_6937-2',
'01': 'iso-8859-5',
'02': 'iso-8859-6',
'03': 'iso-8859-7',
'04': 'iso-8859-8',
}[GSI['CCT']]
self.numberOfTTI = int(GSI['TNB'])
self.startTime = self.__timecodeDecode(
int(GSI['TCF'][0:2]),
int(GSI['TCF'][2:4]),
int(GSI['TCF'][4:6]),
int(GSI['TCF'][6:8])
)
logging.debug(self.__dict__)
def __timecodeDecode(self, h, m, s, f):
return 3600 * h + 60 * m + s + float(f) / self.fps
def _readTTI(self):
while (True):
tci = None
tco = None
txt = []
while (True):
data = self.file.read(128)
if not data:
raise StopIteration()
TTI = dict(zip(
self.TTIfields,
struct.unpack('<BHBBBBBBBBBBBBB112s', data)
))
logging.debug(TTI)
# if comment skip
if TTI['CF']:
continue
if not tci:
tci = self.__timecodeDecode(TTI['TCIh'], TTI['TCIm'], TTI['TCIs'], TTI['TCIf']) - self.startTime
tco = self.__timecodeDecode(TTI['TCOh'], TTI['TCOm'], TTI['TCOs'], TTI['TCOf']) - self.startTime
txt += TTI['TF'].decode(self.codePage).strip()
if TTI['EBN'] == 255:
# skip empty subtitles and those before the start of the show
if txt and tci >= 0:
return (tci, tco, ''.join(txt))
break
def __iter__(self):
return self
def next(self):
return self._readTTI()
if __name__ == '__main__':
from optparse import OptionParser
import sys
parser = OptionParser(usage = 'usage: %prog [options] input output')
parser.add_option('-d', '--debug', dest='debug_level', action='store_const', const=logging.DEBUG, default=logging.ERROR)
(options, args) = parser.parse_args()
if len(args) != 2:
parser.print_help()
sys.exit(1)
logging.basicConfig(level=options.debug_level)
stl = STL(args[0])
c = SRT(args[1])
for sub in stl:
(tci, tco, txt) = sub
c.write(tci, tco, txt)
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