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Add support for timedtext captions
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DUOLabs333
parent
865704dc7b
commit
8df1c3bb57
@ -90,47 +90,52 @@ module Invidious::Routes::API::V1::Videos
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# as well as some other markup that makes it cumbersome, so we try to fix that here
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if caption.name.includes? "auto-generated"
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caption_xml = YT_POOL.client &.get(url).body
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caption_xml = XML.parse(caption_xml)
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webvtt = String.build do |str|
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str << <<-END_VTT
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WEBVTT
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Kind: captions
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Language: #{tlang || caption.language_code}
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if caption_xml.starts_with?("<?xml")
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webvtt =caption.timedtext_to_vtt(caption_xml,tlang)
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else
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caption_xml = XML.parse(caption_xml)
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webvtt = String.build do |str|
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str << <<-END_VTT
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WEBVTT
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Kind: captions
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Language: #{tlang || caption.language_code}
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END_VTT
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END_VTT
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caption_nodes = caption_xml.xpath_nodes("//transcript/text")
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caption_nodes.each_with_index do |node, i|
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start_time = node["start"].to_f.seconds
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duration = node["dur"]?.try &.to_f.seconds
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duration ||= start_time
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caption_nodes = caption_xml.xpath_nodes("//transcript/text")
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caption_nodes.each_with_index do |node, i|
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start_time = node["start"].to_f.seconds
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duration = node["dur"]?.try &.to_f.seconds
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duration ||= start_time
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if caption_nodes.size > i + 1
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end_time = caption_nodes[i + 1]["start"].to_f.seconds
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else
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end_time = start_time + duration
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end
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if caption_nodes.size > i + 1
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end_time = caption_nodes[i + 1]["start"].to_f.seconds
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else
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end_time = start_time + duration
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end
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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')}"
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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')}"
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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')}"
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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')}"
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text = HTML.unescape(node.content)
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text = text.gsub(/<font color="#[a-fA-F0-9]{6}">/, "")
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text = text.gsub(/<\/font>/, "")
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if md = text.match(/(?<name>.*) : (?<text>.*)/)
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text = "<v #{md["name"]}>#{md["text"]}</v>"
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end
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text = HTML.unescape(node.content)
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text = text.gsub(/<font color="#[a-fA-F0-9]{6}">/, "")
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text = text.gsub(/<\/font>/, "")
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if md = text.match(/(?<name>.*) : (?<text>.*)/)
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text = "<v #{md["name"]}>#{md["text"]}</v>"
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end
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str << <<-END_CUE
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#{start_time} --> #{end_time}
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#{text}
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str << <<-END_CUE
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#{start_time} --> #{end_time}
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#{text}
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END_CUE
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end
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end
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END_CUE
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end
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end
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end
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else
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# Some captions have "align:[start/end]" and "position:[num]%"
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# attributes. Those are causing issues with VideoJS, which is unable
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@ -138,7 +143,12 @@ module Invidious::Routes::API::V1::Videos
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#
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# See: https://github.com/iv-org/invidious/issues/2391
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webvtt = YT_POOL.client &.get("#{url}&format=vtt").body
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.gsub(/([0-9:.]{12} --> [0-9:.]{12}).+/, "\\1")
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if webvtt.starts_with?("<?xml")
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webvtt = caption.timedtext_to_vtt(webvtt)
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else
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webvtt = YT_POOL.client &.get("#{url}&format=vtt").body
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.gsub(/([0-9:.]{12} --> [0-9:.]{12}).+/, "\\1")
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end
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end
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if title = env.params.query["title"]?
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@ -31,6 +31,59 @@ module Invidious::Videos
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return captions_list
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end
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def timedtext_to_vtt(timedtext : String, tlang = nil) : String
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#In the future, we could just directly work with the url. This is more of a POC
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cues = [] of XML::Node
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tree = XML.parse(timedtext)
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tree = tree.children.first()
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tree.children.each do |item|
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if item.name == "body"
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item.children.each do |cue|
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if cue.name == "p"
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cues << cue
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end
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end
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break
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end
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end
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result = String.build do |result|
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result << <<-END_VTT
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WEBVTT
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Kind: captions
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Language: #{tlang || @language_code}
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END_VTT
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cues.each_with_index do |node,i|
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start_time = node["t"].to_f.milliseconds
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duration = node["d"]?.try &.to_f.milliseconds
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duration ||= start_time
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if cues.size > i + 1
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end_time = cues[i + 1]["t"].to_f.milliseconds
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else
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end_time = start_time + duration
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end
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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')}"
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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')}"
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text = String.build do |text|
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node.children.each do |s|
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text << s.content
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end
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end
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result << start_time + " --> " + end_time + "\n"
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result << text + "\n"
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result << "\n"
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end
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end
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return result
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end
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# List of all caption languages available on Youtube.
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LANGUAGES = {
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"",
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@ -164,5 +217,6 @@ module Invidious::Videos
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"Yoruba",
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"Zulu",
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}
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end
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end
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