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Captions: Add ability to use Innertube's transcripts API (#4001)

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This commit is contained in:
Samantaz Fox 2023-09-18 23:31:56 +02:00
commit 842e9fade5
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9 changed files with 289 additions and 132 deletions
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13
config/config.example.yml
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@ -161,6 +161,19 @@ https_only: false
#force_resolve:
##
## Use Innertube's transcripts API instead of timedtext for closed captions
##
## Useful for larger instances as InnerTube is **not ratelimited**. See https://github.com/iv-org/invidious/issues/2567
##
## Subtitle experience may differ slightly on Invidious.
##
## Accepted values: true, false
## Default: false
##
# use_innertube_for_captions: false
# -----------------------------
# Logging
# -----------------------------

3
src/invidious/config.cr
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@ -127,6 +127,9 @@ class Config
# Pool size for HTTP requests to youtube.com and ytimg.com (each domain has a separate pool of `pool_size`)
property pool_size : Int32 = 100
# Use Innertube's transcripts API instead of timedtext for closed captions
property use_innertube_for_captions : Bool = false
# Saved cookies in "name1=value1; name2=value2..." format
@[YAML::Field(converter: Preferences::StringToCookies)]
property cookies : HTTP::Cookies = HTTP::Cookies.new

2
src/invidious/frontend/watch_page.cr
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@ -7,7 +7,7 @@ module Invidious::Frontend::WatchPage
getter full_videos : Array(Hash(String, JSON::Any))
getter video_streams : Array(Hash(String, JSON::Any))
getter audio_streams : Array(Hash(String, JSON::Any))
getter captions : Array(Invidious::Videos::Caption)
getter captions : Array(Invidious::Videos::Captions::Metadata)
def initialize(
@full_videos,

112
src/invidious/routes/api/v1/videos.cr
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@ -87,70 +87,78 @@ module Invidious::Routes::API::V1::Videos
caption = caption[0]
end
url = URI.parse("#{caption.base_url}&tlang=#{tlang}").request_target
if CONFIG.use_innertube_for_captions
params = Invidious::Videos::Transcript.generate_param(id, caption.language_code, caption.auto_generated)
initial_data = YoutubeAPI.get_transcript(params)
# Auto-generated captions often have cues that aren't aligned properly with the video,
# 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
webvtt = Invidious::Videos::Transcript.convert_transcripts_to_vtt(initial_data, caption.language_code)
else
# Timedtext API handling
url = URI.parse("#{caption.base_url}&tlang=#{tlang}").request_target
if caption_xml.starts_with?("<?xml")
webvtt = caption.timedtext_to_vtt(caption_xml, tlang)
else
caption_xml = XML.parse(caption_xml)
# Auto-generated captions often have cues that aren't aligned properly with the video,
# 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
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
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
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
if caption_nodes.size > i + 1
end_time = caption_nodes[i + 1]["start"].to_f.seconds
else
end_time = start_time + duration
if caption_nodes.size > i + 1
end_time = caption_nodes[i + 1]["start"].to_f.seconds
else
end_time = start_time + duration
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')}"
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
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')}"
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
end
end
else
# Some captions have "align:[start/end]" and "position:[num]%"
# attributes. Those are causing issues with VideoJS, which is unable
# to properly align the captions on the video, so we remove them.
#
# See: https://github.com/iv-org/invidious/issues/2391
webvtt = YT_POOL.client &.get("#{url}&format=vtt").body
if webvtt.starts_with?("<?xml")
webvtt = caption.timedtext_to_vtt(webvtt)
else
# Some captions have "align:[start/end]" and "position:[num]%"
# attributes. Those are causing issues with VideoJS, which is unable
# to properly align the captions on the video, so we remove them.
#
# 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
end

6
src/invidious/videos.cr
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@ -24,7 +24,7 @@ struct Video
property updated : Time
@[DB::Field(ignore: true)]
@captions = [] of Invidious::Videos::Caption
@captions = [] of Invidious::Videos::Captions::Metadata
@[DB::Field(ignore: true)]
property adaptive_fmts : Array(Hash(String, JSON::Any))?
@ -215,9 +215,9 @@ struct Video
keywords.includes? "YouTube Red"
end
def captions : Array(Invidious::Videos::Caption)
def captions : Array(Invidious::Videos::Captions::Metadata)
if @captions.empty? && @info.has_key?("captions")
@captions = Invidious::Videos::Caption.from_yt_json(info["captions"])
@captions = Invidious::Videos::Captions::Metadata.from_yt_json(info["captions"])
end
return @captions

156
src/invidious/videos/caption.cr
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@ -1,100 +1,106 @@
require "json"
module Invidious::Videos
struct Caption
property name : String
property language_code : String
property base_url : String
module Captions
struct Metadata
property name : String
property language_code : String
property base_url : String
def initialize(@name, @language_code, @base_url)
end
property auto_generated : Bool
# Parse the JSON structure from Youtube
def self.from_yt_json(container : JSON::Any) : Array(Caption)
caption_tracks = container
.dig?("playerCaptionsTracklistRenderer", "captionTracks")
.try &.as_a
captions_list = [] of Caption
return captions_list if caption_tracks.nil?
caption_tracks.each do |caption|
name = caption["name"]["simpleText"]? || caption["name"]["runs"][0]["text"]
name = name.to_s.split(" - ")[0]
language_code = caption["languageCode"].to_s
base_url = caption["baseUrl"].to_s
captions_list << Caption.new(name, language_code, base_url)
def initialize(@name, @language_code, @base_url, @auto_generated)
end
return captions_list
end
# Parse the JSON structure from Youtube
def self.from_yt_json(container : JSON::Any) : Array(Captions::Metadata)
caption_tracks = container
.dig?("playerCaptionsTracklistRenderer", "captionTracks")
.try &.as_a
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
captions_list = [] of Captions::Metadata
return captions_list if caption_tracks.nil?
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
caption_tracks.each do |caption|
name = caption["name"]["simpleText"]? || caption["name"]["runs"][0]["text"]
name = name.to_s.split(" - ")[0]
language_code = caption["languageCode"].to_s
base_url = caption["baseUrl"].to_s
auto_generated = (caption["kind"]? == "asr")
captions_list << Captions::Metadata.new(name, language_code, base_url, auto_generated)
end
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
break
end
end
result = String.build do |result|
result << <<-END_VTT
WEBVTT
Kind: captions
Language: #{tlang || @language_code}
result = String.build do |result|
result << <<-END_VTT
WEBVTT
Kind: captions
Language: #{tlang || @language_code}
END_VTT
END_VTT
result << "\n\n"
result << "\n\n"
cues.each_with_index do |node, i|
start_time = node["t"].to_f.milliseconds
cues.each_with_index do |node, i|
start_time = node["t"].to_f.milliseconds
duration = node["d"]?.try &.to_f.milliseconds
duration = node["d"]?.try &.to_f.milliseconds
duration ||= start_time
duration ||= start_time
if cues.size > i + 1
end_time = cues[i + 1]["t"].to_f.milliseconds
else
end_time = start_time + duration
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
# 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
return result
end
return result
end
# List of all caption languages available on Youtube.

103
src/invidious/videos/transcript.cr Normal file
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@ -0,0 +1,103 @@
module Invidious::Videos
# Namespace for methods primarily relating to Transcripts
module Transcript
record TranscriptLine, start_ms : Time::Span, end_ms : Time::Span, line : String
def self.generate_param(video_id : String, language_code : String, auto_generated : Bool) : String
kind = auto_generated ? "asr" : ""
object = {
"1:0:string" => video_id,
"2:base64" => {
"1:string" => kind,
"2:string" => language_code,
"3:string" => "",
},
"3:varint" => 1_i64,
"5:string" => "engagement-panel-searchable-transcript-search-panel",
"6:varint" => 1_i64,
"7:varint" => 1_i64,
"8:varint" => 1_i64,
}
params = object.try { |i| Protodec::Any.cast_json(i) }
.try { |i| Protodec::Any.from_json(i) }
.try { |i| Base64.urlsafe_encode(i) }
.try { |i| URI.encode_www_form(i) }
return params
end
def self.convert_transcripts_to_vtt(initial_data : Hash(String, JSON::Any), target_language : String) : String
# Convert into array of TranscriptLine
lines = self.parse(initial_data)
# Taken from Invidious::Videos::Captions::Metadata.timedtext_to_vtt()
vtt = String.build do |vtt|
vtt << <<-END_VTT
WEBVTT
Kind: captions
Language: #{target_language}
END_VTT
vtt << "\n\n"
lines.each do |line|
start_time = line.start_ms
end_time = line.end_ms
# start_time
vtt << start_time.hours.to_s.rjust(2, '0')
vtt << ':' << start_time.minutes.to_s.rjust(2, '0')
vtt << ':' << start_time.seconds.to_s.rjust(2, '0')
vtt << '.' << start_time.milliseconds.to_s.rjust(3, '0')
vtt << " --> "
# end_time
vtt << end_time.hours.to_s.rjust(2, '0')
vtt << ':' << end_time.minutes.to_s.rjust(2, '0')
vtt << ':' << end_time.seconds.to_s.rjust(2, '0')
vtt << '.' << end_time.milliseconds.to_s.rjust(3, '0')
vtt << "\n"
vtt << line.line
vtt << "\n"
vtt << "\n"
end
end
return vtt
end
private def self.parse(initial_data : Hash(String, JSON::Any))
body = initial_data.dig("actions", 0, "updateEngagementPanelAction", "content", "transcriptRenderer",
"content", "transcriptSearchPanelRenderer", "body", "transcriptSegmentListRenderer",
"initialSegments").as_a
lines = [] of TranscriptLine
body.each do |line|
# Transcript section headers. They are not apart of the captions and as such we can safely skip them.
if line.as_h.has_key?("transcriptSectionHeaderRenderer")
next
end
line = line["transcriptSegmentRenderer"]
start_ms = line["startMs"].as_s.to_i.millisecond
end_ms = line["endMs"].as_s.to_i.millisecond
text = extract_text(line["snippet"]) || ""
lines << TranscriptLine.new(start_ms, end_ms, text)
end
return lines
end
end
end

2
src/invidious/views/user/preferences.ecr
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@ -89,7 +89,7 @@
<label for="captions[0]"><%= translate(locale, "preferences_captions_label") %></label>
<% preferences.captions.each_with_index do |caption, index| %>
<select class="pure-u-1-6" name="captions[<%= index %>]" id="captions[<%= index %>]">
<% Invidious::Videos::Caption::LANGUAGES.each do |option| %>
<% Invidious::Videos::Captions::LANGUAGES.each do |option| %>
<option value="<%= option %>" <% if preferences.captions[index] == option %> selected <% end %>><%= translate(locale, option.blank? ? "none" : option) %></option>
<% end %>
</select>

24
src/invidious/yt_backend/youtube_api.cr
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@ -557,6 +557,30 @@ module YoutubeAPI
return self._post_json("/youtubei/v1/search", data, client_config)
end
####################################################################
# get_transcript(params, client_config?)
#
# Requests the youtubei/v1/get_transcript endpoint with the required headers
# and POST data in order to get a JSON reply.
#
# The requested data is a specially encoded protobuf string that denotes the specific language requested.
#
# An optional ClientConfig parameter can be passed, too (see
# `struct ClientConfig` above for more details).
#
def get_transcript(
params : String,
client_config : ClientConfig | Nil = nil
) : Hash(String, JSON::Any)
data = {
"context" => self.make_context(client_config),
"params" => params,
}
return self._post_json("/youtubei/v1/get_transcript", data, client_config)
end
####################################################################
# _post_json(endpoint, data, client_config?)
#