Add support for timedtext captions (#3533)

pull/3590/head
Samantaz Fox 2 years ago
commit 624425cfa8
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@ -93,45 +93,50 @@ module Invidious::Routes::API::V1::Videos
# as well as some other markup that makes it cumbersome, so we try to fix that here
if caption.name.includes? "auto-generated"
caption_xml = YT_POOL.client &.get(url).body
caption_xml = XML.parse(caption_xml)
webvtt = String.build do |str|
str << <<-END_VTT
WEBVTT
Kind: captions
Language: #{tlang || caption.language_code}
if caption_xml.starts_with?("<?xml")
webvtt = caption.timedtext_to_vtt(caption_xml, tlang)
else
caption_xml = XML.parse(caption_xml)
webvtt = String.build do |str|
str << <<-END_VTT
WEBVTT
Kind: captions
Language: #{tlang || caption.language_code}
END_VTT
caption_nodes = caption_xml.xpath_nodes("//transcript/text")
caption_nodes.each_with_index do |node, i|
start_time = node["start"].to_f.seconds
duration = node["dur"]?.try &.to_f.seconds
duration ||= start_time
END_VTT
if caption_nodes.size > i + 1
end_time = caption_nodes[i + 1]["start"].to_f.seconds
else
end_time = start_time + duration
end
caption_nodes = caption_xml.xpath_nodes("//transcript/text")
caption_nodes.each_with_index do |node, i|
start_time = node["start"].to_f.seconds
duration = node["dur"]?.try &.to_f.seconds
duration ||= start_time
start_time = "#{start_time.hours.to_s.rjust(2, '0')}:#{start_time.minutes.to_s.rjust(2, '0')}:#{start_time.seconds.to_s.rjust(2, '0')}.#{start_time.milliseconds.to_s.rjust(3, '0')}"
end_time = "#{end_time.hours.to_s.rjust(2, '0')}:#{end_time.minutes.to_s.rjust(2, '0')}:#{end_time.seconds.to_s.rjust(2, '0')}.#{end_time.milliseconds.to_s.rjust(3, '0')}"
if caption_nodes.size > i + 1
end_time = caption_nodes[i + 1]["start"].to_f.seconds
else
end_time = start_time + duration
end
text = HTML.unescape(node.content)
text = text.gsub(/<font color="#[a-fA-F0-9]{6}">/, "")
text = text.gsub(/<\/font>/, "")
if md = text.match(/(?<name>.*) : (?<text>.*)/)
text = "<v #{md["name"]}>#{md["text"]}</v>"
end
start_time = "#{start_time.hours.to_s.rjust(2, '0')}:#{start_time.minutes.to_s.rjust(2, '0')}:#{start_time.seconds.to_s.rjust(2, '0')}.#{start_time.milliseconds.to_s.rjust(3, '0')}"
end_time = "#{end_time.hours.to_s.rjust(2, '0')}:#{end_time.minutes.to_s.rjust(2, '0')}:#{end_time.seconds.to_s.rjust(2, '0')}.#{end_time.milliseconds.to_s.rjust(3, '0')}"
str << <<-END_CUE
#{start_time} --> #{end_time}
#{text}
text = HTML.unescape(node.content)
text = text.gsub(/<font color="#[a-fA-F0-9]{6}">/, "")
text = text.gsub(/<\/font>/, "")
if md = text.match(/(?<name>.*) : (?<text>.*)/)
text = "<v #{md["name"]}>#{md["text"]}</v>"
end
str << <<-END_CUE
#{start_time} --> #{end_time}
#{text}
END_CUE
END_CUE
end
end
end
else
@ -141,7 +146,12 @@ module Invidious::Routes::API::V1::Videos
#
# See: https://github.com/iv-org/invidious/issues/2391
webvtt = YT_POOL.client &.get("#{url}&format=vtt").body
.gsub(/([0-9:.]{12} --> [0-9:.]{12}).+/, "\\1")
if webvtt.starts_with?("<?xml")
webvtt = caption.timedtext_to_vtt(webvtt)
else
webvtt = YT_POOL.client &.get("#{url}&format=vtt").body
.gsub(/([0-9:.]{12} --> [0-9:.]{12}).+/, "\\1")
end
end
if title = env.params.query["title"]?

@ -31,6 +31,72 @@ module Invidious::Videos
return captions_list
end
def timedtext_to_vtt(timedtext : String, tlang = nil) : String
# In the future, we could just directly work with the url. This is more of a POC
cues = [] of XML::Node
tree = XML.parse(timedtext)
tree = tree.children.first
tree.children.each do |item|
if item.name == "body"
item.children.each do |cue|
if cue.name == "p" && !(cue.children.size == 1 && cue.children[0].content == "\n")
cues << cue
end
end
break
end
end
result = String.build do |result|
result << <<-END_VTT
WEBVTT
Kind: captions
Language: #{tlang || @language_code}
END_VTT
result << "\n\n"
cues.each_with_index do |node, i|
start_time = node["t"].to_f.milliseconds
duration = node["d"]?.try &.to_f.milliseconds
duration ||= start_time
if cues.size > i + 1
end_time = cues[i + 1]["t"].to_f.milliseconds
else
end_time = start_time + duration
end
# start_time
result << start_time.hours.to_s.rjust(2, '0')
result << ':' << start_time.minutes.to_s.rjust(2, '0')
result << ':' << start_time.seconds.to_s.rjust(2, '0')
result << '.' << start_time.milliseconds.to_s.rjust(3, '0')
result << " --> "
# end_time
result << end_time.hours.to_s.rjust(2, '0')
result << ':' << end_time.minutes.to_s.rjust(2, '0')
result << ':' << end_time.seconds.to_s.rjust(2, '0')
result << '.' << end_time.milliseconds.to_s.rjust(3, '0')
result << "\n"
node.children.each do |s|
result << s.content
end
result << "\n"
result << "\n"
end
end
return result
end
# List of all caption languages available on Youtube.
LANGUAGES = {
"",

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