Class: SamveraHls::HlsPlaylistGenerator

Inherits:
Object
  • Object
show all
Defined in:
app/services/samvera_hls/hls_playlist_generator.rb

Class Method Summary collapse

Class Method Details

.derivative_url(file_set_id, destination_name) ⇒ Object 



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# File 'app/services/samvera_hls/hls_playlist_generator.rb', line 78

def derivative_url file_set_id, destination_name 
  derivative_path(file_set_id, destination_name).gsub(Hyrax.config.derivatives_path,"")
end

.hls_dir(file_set_id) ⇒ Object 



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# File 'app/services/samvera_hls/hls_playlist_generator.rb', line 74

def hls_dir file_set_id
  derivative_path(file_set_id,"hls").gsub(/\.hls\z/,"")
end

.hls_master_playlist(file_set_id, root_url) ⇒ Object 



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# File 'app/services/samvera_hls/hls_playlist_generator.rb', line 9

def hls_master_playlist file_set_id, root_url
  # make sure the root url doesn't get any default  params attached (e.g. locale)
  parsed_url = URI::parse(root_url)
  parsed_url.fragment = parsed_url.query = nil
  root_url = parsed_url.to_s

  type = SolrDocument.find(file_set_id).mime_type.split('/')[0]
  config = hls_config[type]
  return nil if config.nil?
  defaults = config["default"]
  playlist = "#EXTM3U\n"
  playlist << "#EXT-X-VERSION:6\n"
  variants(file_set_id).each do |variant| 
    next if variant.blank?
    path, filename = File.split(variant)
    format = filename.gsub(".m3u8","")
    options = defaults.merge(config[format])
    playlist << "#EXT-X-STREAM-INF:PROGRAM-ID=1,"
    playlist << "BANDWIDTH=#{options["maxrate"]},"
    playlist << "CODECS=\"#{options["codec_code"]}\","
    playlist << "RESOLUTION=#{options["resolution"]}\n"
    playlist << File.join(root_url,variant_url(file_set_id,format)) + "\n"
  end
  playlist
end

.hls_master_url(file_set_id) ⇒ Object 



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# File 'app/services/samvera_hls/hls_playlist_generator.rb', line 5

def hls_master_url file_set_id
  File.join("file_set",file_set_id,"hls.m3u8")
end

.hls_segment_playlist(file_set_id, root_url, format) ⇒ Object 



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# File 'app/services/samvera_hls/hls_playlist_generator.rb', line 35

def hls_segment_playlist file_set_id, root_url, format
  # make sure the root url doesn't get any default  params attached (e.g. locale)
  parsed_url = URI::parse(root_url)
  parsed_url.fragment = parsed_url.query = nil
  root_url = parsed_url.to_s

  # initialize timestamp once for whole playlist
  timestamp = Time.now.to_i + 7200

  playlist = ""

  File.open(segment_playlist_path(file_set_id, format),'r') {|file|
    
    variant_token = false;
    file.each_line do |line|
      if line.include? ".ts" then
        # We only need to set the token once for each variant file. 
        # It doesn't depend on which segment we're playing, so we 
        # speed things up by only calculating one.
        variant_token ||= token(file_set_id,line, timestamp)
        if Rails.env == "development" || Rails.env == "test"
          playlist << File.join(root_url,
                                segment_url_base(file_set_id),
                                line).strip+"\n"
        else
          playlist << File.join(root_url,
                                segment_url_base(file_set_id),
                                timestamp.to_s,
                                variant_token,
                                line).strip+"\n"
        end
      else
        playlist << line.strip+"\n"
      end
    end
  }
  playlist
end