Don't imply autoplay when t option set in embed context

app/controllers/api/asciicasts_controller.rb

@@ -30,7 +30,7 @@ module Api
         end
 
         format.json do
-          render json: asciicast, playback_options: PlaybackOptions.new
+          render json: asciicast, v0: params[:v0]
         end
       end
     end

app/models/embed_playback_options.rb

@@ -0,0 +1,3 @@
+class EmbedPlaybackOptions < PlaybackOptions
+  attribute :autoplay, Boolean, default: false
+end

app/models/playback_options.rb

@@ -25,7 +25,7 @@ class PlaybackOptions
   def as_json(*)
     opts = {
       speed: speed,
-      autoPlay: autoplay,
+      autoPlay: autoplay.nil? ? !!t : autoplay,
       loop: loop,
       fontSize: size,
       theme: theme,

app/presenters/bare_asciicast_page_presenter.rb

@@ -9,7 +9,7 @@ class BareAsciicastPagePresenter
       'theme' =>  decorated_asciicast.theme_name
     }.merge(playback_options)
 
-    new(decorated_asciicast, PlaybackOptions.new(playback_options))
+    new(decorated_asciicast, EmbedPlaybackOptions.new(playback_options))
   end
 
   def initialize(asciicast, playback_options)

app/serializers/asciicast_serializer.rb

@@ -10,7 +10,7 @@ class AsciicastSerializer < ActiveModel::Serializer
   end
 
   def url
-    if playback_options.v0
+    if v0_url?
       object.stdout_frames_url
     else
       object.data_url
@@ -39,8 +39,8 @@ class AsciicastSerializer < ActiveModel::Serializer
 
   private
 
-  def playback_options
-    @options[:playback_options]
+  def v0_url?
+    !!@options[:v0]
   end
 
 end