Add DASH quality preference

The options are `auto` (the current and default behavior), `best` and `worst`.

The UI is only updated once playback starts.

assets/js/player.js

@@ -154,6 +154,18 @@ if (video_data.params.autoplay) {
 
 if (!video_data.params.listen && video_data.params.quality === 'dash') {
     player.httpSourceSelector();
+
+    if (video_data.params.quality_dash != "auto") {
+        player.ready(() => {
+            player.on("loadedmetadata", () => {
+                const qualityLevels = Array.from(player.qualityLevels()).sort((a, b) => a.height - b.height);
+                const targetQualityLevel = video_data.params.quality_dash == "best" ? qualityLevels.length - 1 : 0;
+                for (let i = 0; i < qualityLevels.length; i++) {
+                    qualityLevels[i].enabled = (i == targetQualityLevel)
+                }
+            });
+        });
+    }
 }
 
 player.vttThumbnails({
@@ -510,4 +522,6 @@ window.addEventListener('keydown', e => {
 }());
 
 // Since videojs-share can sometimes be blocked, we defer it until last
+if (player.share) {
     player.share(shareOptions);
+}

src/invidious/helpers/helpers.cr

@@ -41,6 +41,7 @@ struct ConfigPreferences
   property notifications_only : Bool = false
   property player_style : String = "invidious"
   property quality : String = "hd720"
+  property quality_dash : String = "auto"
   property default_home : String = "Popular"
   property feed_menu : Array(String) = ["Popular", "Trending", "Subscriptions", "Playlists"]
   property related_videos : Bool = true

src/invidious/routes/user_preferences.cr

@@ -54,6 +54,9 @@ class Invidious::Routes::UserPreferences < Invidious::Routes::BaseRoute
     quality = env.params.body["quality"]?.try &.as(String)
     quality ||= CONFIG.default_user_preferences.quality
 
+    quality_dash = env.params.body["quality_dash"]?.try &.as(String)
+    quality_dash ||= CONFIG.default_user_preferences.quality_dash
+
     volume = env.params.body["volume"]?.try &.as(String).to_i?
     volume ||= CONFIG.default_user_preferences.volume
 
@@ -127,6 +130,7 @@ class Invidious::Routes::UserPreferences < Invidious::Routes::BaseRoute
       notifications_only:     notifications_only,
       player_style:           player_style,
       quality:                quality,
+      quality_dash:           quality_dash,
       default_home:           default_home,
       feed_menu:              feed_menu,
       related_videos:         related_videos,

src/invidious/users.cr

@@ -66,6 +66,8 @@ struct Preferences
 
   @[JSON::Field(converter: Preferences::ProcessString)]
   property quality : String = CONFIG.default_user_preferences.quality
+  @[JSON::Field(converter: Preferences::ProcessString)]
+  property quality_dash : String = CONFIG.default_user_preferences.quality_dash
   property default_home : String = CONFIG.default_user_preferences.default_home
   property feed_menu : Array(String) = CONFIG.default_user_preferences.feed_menu
   property related_videos : Bool = CONFIG.default_user_preferences.related_videos

src/invidious/videos.cr

@@ -235,6 +235,7 @@ struct VideoPreferences
   property preferred_captions : Array(String)
   property player_style : String
   property quality : String
+  property quality_dash : String
   property raw : Bool
   property region : String?
   property related_videos : Bool
@@ -1043,6 +1044,7 @@ def process_video_params(query, preferences)
   player_style = query["player_style"]?
   preferred_captions = query["subtitles"]?.try &.split(",").map { |a| a.downcase }
   quality = query["quality"]?
+  quality_dash = query["quality_dash"]?
   region = query["region"]?
   related_videos = query["related_videos"]?.try { |q| (q == "true" || q == "1").to_unsafe }
   speed = query["speed"]?.try &.rchop("x").to_f?
@@ -1061,6 +1063,7 @@ def process_video_params(query, preferences)
     player_style ||= preferences.player_style
     preferred_captions ||= preferences.captions
     quality ||= preferences.quality
+    quality_dash ||= preferences.quality_dash
     related_videos ||= preferences.related_videos.to_unsafe
     speed ||= preferences.speed
     video_loop ||= preferences.video_loop.to_unsafe
@@ -1077,6 +1080,7 @@ def process_video_params(query, preferences)
   player_style ||= CONFIG.default_user_preferences.player_style
   preferred_captions ||= CONFIG.default_user_preferences.captions
   quality ||= CONFIG.default_user_preferences.quality
+  quality_dash ||= CONFIG.default_user_preferences.quality_dash
   related_videos ||= CONFIG.default_user_preferences.related_videos.to_unsafe
   speed ||= CONFIG.default_user_preferences.speed
   video_loop ||= CONFIG.default_user_preferences.video_loop.to_unsafe
@@ -1129,6 +1133,7 @@ def process_video_params(query, preferences)
     player_style:       player_style,
     preferred_captions: preferred_captions,
     quality:            quality,
+    quality_dash:       quality_dash,
     raw:                raw,
     region:             region,
     related_videos:     related_videos,

src/invidious/views/preferences.ecr

@@ -57,6 +57,17 @@
                 </select>
             </div>
 
+            <% if !CONFIG.disabled?("dash") %>
+                <div class="pure-control-group">
+                    <label for="quality_dash"><%= translate(locale, "Preferred dash video quality: ") %></label>
+                    <select name="quality_dash" id="quality_dash">
+                        <% {"auto", "best", "worst"}.each do |option| %>
+                            <option value="<%= option %>" <% if preferences.quality_dash == option %> selected <% end %>><%= translate(locale, option) %></option>
+                        <% end %>
+                    </select>
+                </div>
+            <% end %>
+
             <div class="pure-control-group">
                 <label for="volume"><%= translate(locale, "Player volume: ") %></label>
                 <input name="volume" id="volume" data-onrange="update_volume_value" type="range" min="0" max="100" step="5" value="<%= preferences.volume %>">