Favor poster from options over precomputed one

app/helpers/asciicasts_helper.rb

@@ -13,7 +13,7 @@ module AsciicastsHelper
       src: asciicast.url,
       cols: asciicast.width,
       rows: asciicast.height,
-      poster: 'data:application/json;base64,' + Base64.encode64(asciicast.snapshot.to_json),
+      poster: options.poster || base64_poster(asciicast),
       speed: options.speed,
       autoplay: options.autoplay,
       loop: options.loop,
@@ -72,4 +72,8 @@ module AsciicastsHelper
     }
   end
 
+  def base64_poster(asciicast)
+    'data:application/json;base64,' + Base64.encode64(asciicast.snapshot.to_json)
+  end
+
 end

app/models/embed_playback_options.rb

@@ -1,12 +1,3 @@
 class EmbedPlaybackOptions < PlaybackOptions
   attribute :autoplay, Boolean, default: false
-
-  def as_json(*)
-    if !poster && t && t > 0
-      super.merge({ poster: "npt:#{t}" })
-    else
-      super
-    end
-  end
-
 end

app/models/playback_options.rb

@@ -24,22 +24,19 @@ class PlaybackOptions
   attribute :v0,        Boolean, default: false
   attribute :poster,    String
 
-  def as_json(*)
-    opts = {
-      speed: speed,
-      autoPlay: autoplay.nil? ? !!t : autoplay,
-      loop: loop,
-      preload: preload,
-      fontSize: size,
-      theme: theme,
-      poster: poster,
-    }
-
-    if t
-      opts = opts.merge(startAt: t)
-    end
+  def autoplay()
+    ap = super
+    ap.nil? ? !!t : ap
+  end
 
-    opts
+  def poster()
+    p = super
+
+    if !p && t && t > 0 && !autoplay
+      "npt:#{t}"
+    else
+      p
+    end
   end
 
 end