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[ffmpeg] Add dfxp (TTML) subtitles support (#3432, #5146)

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This commit is contained in:
Yen Chi Hsuan 2015-04-25 23:15:05 +08:00
parent 672f1bd849
commit bf6427d2fb
3 changed files with 116 additions and 0 deletions
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38
test/test_utils.py
View File

@ -58,6 +58,8 @@
xpath_text,
render_table,
match_str,
parse_dfxp_time_expr,
dfxp2srt,
)
@ -581,6 +583,42 @@ def test_match_str(self):
'like_count > 100 & dislike_count <? 50 & description',
{'like_count': 190, 'dislike_count': 10}))
def test_parse_dfxp_time_expr(self):
self.assertEqual(parse_dfxp_time_expr(None), 0.0)
self.assertEqual(parse_dfxp_time_expr(''), 0.0)
self.assertEqual(parse_dfxp_time_expr('0.1'), 0.1)
self.assertEqual(parse_dfxp_time_expr('0.1s'), 0.1)
self.assertEqual(parse_dfxp_time_expr('00:00:01'), 1.0)
self.assertEqual(parse_dfxp_time_expr('00:00:01.100'), 1.1)
def test_dfxp2srt(self):
dfxp_data = '''<?xml version="1.0" encoding="UTF-8"?>
<tt xmlns="http://www.w3.org/ns/ttml" xml:lang="en" xmlns:tts="http://www.w3.org/ns/ttml#parameter">
<body>
<div xml:lang="en">
<p begin="0" end="1">The following line contains Chinese characters and special symbols</p>
<p begin="1" end="2">第二行<br/>♪♪</p>
<p begin="2" end="3"><span>Third<br/>Line</span></p>
</div>
</body>
</tt>'''
srt_data = '''1
00:00:00,000 --> 00:00:01,000
The following line contains Chinese characters and special symbols
2
00:00:01,000 --> 00:00:02,000
第二行
♪♪
3
00:00:02,000 --> 00:00:03,000
Third
Line
'''
self.assertEqual(dfxp2srt(dfxp_data), srt_data)
if __name__ == '__main__':
unittest.main()

25
youtube_dl/postprocessor/ffmpeg.py
View File

@ -20,6 +20,7 @@
prepend_extension,
shell_quote,
subtitles_filename,
dfxp2srt,
)
@ -651,6 +652,30 @@ def run(self, info):
'format' % new_ext)
continue
new_file = subtitles_filename(filename, lang, new_ext)
if ext == 'dfxp' or ext == 'ttml':
self._downloader.report_warning(
'You have requested to convert dfxp (TTML) subtitles into another format, '
'which results in style information loss')
dfxp_file = subtitles_filename(filename, lang, ext)
srt_file = subtitles_filename(filename, lang, 'srt')
with io.open(dfxp_file, 'rt', encoding='utf-8') as f:
srt_data = dfxp2srt(f.read())
with io.open(srt_file, 'wt', encoding='utf-8') as f:
f.write(srt_data)
ext = 'srt'
subs[lang] = {
'ext': 'srt',
'data': srt_data
}
if new_ext == 'srt':
continue
self.run_ffmpeg(
subtitles_filename(filename, lang, ext),
new_file, ['-f', new_format])

53
youtube_dl/utils.py
View File

@ -1800,6 +1800,59 @@ def _match_func(info_dict):
return _match_func
def parse_dfxp_time_expr(time_expr):
if not time_expr:
return 0.0
mobj = re.match(r'^(?P<time_offset>\d+(?:\.\d+)?)s?$', time_expr)
if mobj:
return float(mobj.group('time_offset'))
mobj = re.match(r'^(\d+):(\d\d):(\d\d(?:\.\d+)?)$', time_expr)
if mobj:
return 3600 * int(mobj.group(1)) + 60 * int(mobj.group(2)) + float(mobj.group(3))
def format_srt_time(seconds):
(mins, secs) = divmod(seconds, 60)
(hours, mins) = divmod(mins, 60)
millisecs = (secs - int(secs)) * 1000
secs = int(secs)
return '%02d:%02d:%02d,%03d' % (hours, mins, secs, millisecs)
def dfxp2srt(dfxp_data):
_x = functools.partial(xpath_with_ns, ns_map={'ttml': 'http://www.w3.org/ns/ttml'})
def parse_node(node):
str_or_empty = functools.partial(str_or_none, default='')
out = str_or_empty(node.text)
for child in node:
if child.tag == _x('ttml:br'):
out += '\n' + str_or_empty(child.tail)
elif child.tag == _x('ttml:span'):
out += str_or_empty(parse_node(child))
else:
out += str_or_empty(xml.etree.ElementTree.tostring(child))
return out
dfxp = xml.etree.ElementTree.fromstring(dfxp_data.encode('utf-8'))
out = []
paras = dfxp.findall(_x('.//ttml:p'))
for para, index in zip(paras, itertools.count(1)):
out.append('%d\n%s --> %s\n%s\n\n' % (
index,
format_srt_time(parse_dfxp_time_expr(para.attrib.get('begin'))),
format_srt_time(parse_dfxp_time_expr(para.attrib.get('end'))),
parse_node(para)))
return ''.join(out)
class PerRequestProxyHandler(compat_urllib_request.ProxyHandler):
def __init__(self, proxies=None):
# Set default handlers