add song title for music tracks

locales/en-US.json

@@ -190,6 +190,7 @@
     "Blacklisted regions: ": "Blacklisted regions: ",
     "Music in this video": "Music in this video",
     "Artist: ": "Artist: ",
+    "Song: ": "Song: ",
     "Album: ": "Album: ",
     "Shared `x`": "Shared `x`",
     "Premieres in `x`": "Premieres in `x`",

src/invidious/jsonify/api_v1/video_json.cr

@@ -197,6 +197,21 @@ module Invidious::JSONify::APIv1
         end
       end
 
+      if !video.music.empty?
+        json.field "musicTracks" do
+          json.array do
+            video.music.each do |music|
+              json.object do
+                json.field "song", music.song
+                json.field "artist", music.artist
+                json.field "album", music.album
+                json.field "license", music.license
+              end
+            end
+          end
+        end
+      end
+
       json.field "recommendedVideos" do
         json.array do
           video.related_videos.each do |rv|

src/invidious/videos.cr

@@ -249,7 +249,7 @@ struct Video
 
   def music : Array(VideoMusic)
     info["music"].as_a.map { |music_json|
-      VideoMusic.new(music_json["album"].as_s, music_json["artist"].as_s, music_json["license"].as_s)
+      VideoMusic.new(music_json["song"].as_s, music_json["album"].as_s, music_json["artist"].as_s, music_json["license"].as_s)
     }
   end
 

src/invidious/videos/music.cr

@@ -3,10 +3,11 @@ require "json"
 struct VideoMusic
   include JSON::Serializable
 
+  property song : String
   property album : String
   property artist : String
   property license : String
 
-  def initialize(@album : String, @artist : String, @license : String)
+  def initialize(@song : String, @album : String, @artist : String, @license : String)
   end
 end

src/invidious/videos/parser.cr

@@ -322,6 +322,7 @@ def parse_video_info(video_id : String, player_response : Hash(String, JSON::Any
 
   music_desclist.try &.as_a.each do |music_desc|
     artist = nil
+    song = nil
     album = nil
     music_license = nil
 
@@ -329,13 +330,15 @@ def parse_video_info(video_id : String, player_response : Hash(String, JSON::Any
       desc_title = extract_text(desc.dig?("infoRowRenderer", "title"))
       if desc_title == "ARTIST"
         artist = extract_text(desc.dig?("infoRowRenderer", "defaultMetadata"))
+      elsif desc_title == "SONG"
+        song = extract_text(desc.dig?("infoRowRenderer", "defaultMetadata"))
       elsif desc_title == "ALBUM"
         album = extract_text(desc.dig?("infoRowRenderer", "defaultMetadata"))
       elsif desc_title == "LICENSES"
         music_license = extract_text(desc.dig?("infoRowRenderer", "expandedMetadata"))
       end
     end
-    music_list << VideoMusic.new(album.to_s, artist.to_s, music_license.to_s)
+    music_list << VideoMusic.new(song.to_s, album.to_s, artist.to_s, music_license.to_s)
   end
 
   # Author infos

src/invidious/views/watch.ecr

@@ -248,9 +248,10 @@ we're going to need to do it here in order to allow for translations.
                 <div id="music-description-box">
                     <% video.music.each do |music| %>
                         <div class="music-item">
-                            <p id="music-artist"><%= translate(locale, "Artist: ") %><%= music.artist %></p>
+                            <p class="music-song"><%= translate(locale, "Song: ") %><%= music.song %></p>
-                            <p id="music-album"><%= translate(locale, "Album: ") %><%= music.album %></p>
+                            <p class="music-artist"><%= translate(locale, "Artist: ") %><%= music.artist %></p>
-                            <p id="music-license"><%= translate(locale, "License: ") %><%= music.license %></p>
+                            <p class="music-album"><%= translate(locale, "Album: ") %><%= music.album %></p>
+                            <p class="music-license"><%= translate(locale, "License: ") %><%= music.license %></p>
                         </div>
                     <% end %>
                 </div>