Add logic to parse channel watermark data

src/invidious/jsonify/api_v1/video_json.cr

@@ -55,6 +55,10 @@ module Invidious::JSONify::APIv1
         end
       end
 
+      if watermark = video.watermark?
+        json.field "authorWatermark", watermark
+      end
+
       json.field "subCountText", video.sub_count_text
 
       json.field "lengthSeconds", video.length_seconds

src/invidious/videos.cr

@@ -15,7 +15,7 @@ struct Video
   # NOTE: don't forget to bump this number if any change is made to
   # the `params` structure in videos/parser.cr!!!
   #
-  SCHEMA_VERSION = 2
+  SCHEMA_VERSION = 3
 
   property id : String
 
@@ -258,6 +258,10 @@ struct Video
     }
   end
 
+  def watermark?
+    return info["watermark"]?
+  end
+
   # Macros defining getters/setters for various types of data
 
   private macro getset_string(name)

src/invidious/videos/parser.cr

@@ -378,6 +378,18 @@ def parse_video_info(video_id : String, player_response : Hash(String, JSON::Any
       .try &.as_s.split(" ", 2)[0]
   end
 
+  # Channel watermark
+  # Annotations is different from legacy annotations
+  if watermark = player_response.dig?("annotations", 0, "playerAnnotationsExpandedRenderer", "featuredChannel")
+    watermark_data = {
+      "startTimeMs"  => watermark["startTimeMs"],
+      "endTimeMS"    => watermark["endTimeMs"],
+      "thumbnailURL" => watermark["watermark"]["thumbnails"][0]["url"],
+    }
+  else
+    watermark_data = {} of String => JSON::Any
+  end
+
   # Return data
 
   if live_now
@@ -422,6 +434,7 @@ def parse_video_info(video_id : String, player_response : Hash(String, JSON::Any
     "authorThumbnail" => JSON::Any.new(author_thumbnail.try &.as_s || ""),
     "authorVerified"  => JSON::Any.new(author_verified || false),
     "subCountText"    => JSON::Any.new(subs_text || "-"),
+    "watermark"       => JSON::Any.new(watermark_data),
   }
 
   return params