Merge pull request #5082 from avalonmediasystem/hls_subtitles

HLS captions for iOS

app/controllers/master_files_controller.rb

@@ -325,6 +325,11 @@ def hls_manifest
     end
   end
 
+  def caption_manifest
+    return head :unauthorized if cannot?(:read, @master_file)
+    @caption = @master_file.captions
+  end
+
   def structure
     authorize! :read, @master_file, message: "You do not have sufficient privileges"
     render json: @master_file.structuralMetadata.as_json

app/views/master_files/caption_manifest.m3u8.erb

@@ -0,0 +1,10 @@
+<% caption = captions_master_file_path %>
+
+#EXTM3U
+#EXT-X-TARGETDURATION:<%= @master_file.duration %>
+#EXT-X-VERSION:3
+#EXT-X-MEDIA-SEQUENCE:0
+#EXT-X-PLAYLIST-TYPE:VOD
+#EXTINF:<%= @master_file.duration %>
+<%= caption %>
+#EXT-X-ENDLIST

app/views/master_files/hls_manifest.m3u8.erb

@@ -14,7 +14,8 @@ Unless required by applicable law or agreed to in writing, software distributed
 ---  END LICENSE_HEADER BLOCK  ---
 %>
 #EXTM3U
+#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",LANGUAGE="en",NAME="English",AUTOSELECT=YES,URI="<%= caption_manifest_master_file_path %>"
 <% @hls_streams.each do |hls| %>
-#EXT-X-STREAM-INF:BANDWIDTH=<%= hls[:bitrate] %>
+#EXT-X-STREAM-INF:BANDWIDTH=<%= hls[:bitrate] %>,SUBTITLES="subs"
 <%= hls[:url] %>
 <% end %>

config/application.rb

@@ -47,6 +47,8 @@ class Application < Rails::Application
         resource '/master_files/*/structure.json', headers: :any, methods: [:get, :post, :delete]
         resource '/master_files/*/waveform.json', headers: :any, methods: [:get]
         resource '/master_files/*/*.m3u8', headers: :any, credentials: true, methods: [:get, :head]
+        resource '/master_files/*/caption_manifest', headers: :any, methods: [:get]
+        resource '/master_files/*/captions', headers: :any, methods: [:get]
         resource '/timelines/*/manifest.json', headers: :any, methods: [:get, :post]
       end
     end

config/routes.rb

@@ -158,6 +158,7 @@
       get :captions
       get :waveform
       match ':quality.m3u8', to: 'master_files#hls_manifest', via: [:get], as: :hls_manifest
+      get 'caption_manifest'
       get 'structure', to: 'master_files#structure', constraints: { format: 'json' }
       post 'structure', to: 'master_files#set_structure', constraints: { format: 'json' }
       delete 'structure', to: 'master_files#delete_structure', constraints: { format: 'json' }