Method: M3Uzi#generate_encryption_key_line

Defined in:

lib/m3uzi.rb

#generate_encryption_key_line(file) ⇒ Object

# File 'lib/m3uzi.rb', line 132

def generate_encryption_key_line(file)
  generate_line = false

  default_iv = @encryption_iv || format_iv(@encryption_sequence)

  if (file.encryption_key_url != :unset) && (file.encryption_key_url != @encryption_key_url)
    @encryption_key_url = file.encryption_key_url
    generate_line = true
  end

  if @encryption_key_url && file.encryption_iv != @encryption_iv
    @encryption_iv = file.encryption_iv
    generate_line = true
  end

  @encryption_sequence += 1

  if generate_line
    if @encryption_key_url.nil?
      "#EXT-X-KEY:METHOD=NONE"
    else
      attrs = ['METHOD=AES-128']
      attrs << 'URI="' + @encryption_key_url.gsub('"','%22').gsub(/[\r\n]/,'').strip + '"'
      attrs << "IV=#{@encryption_iv}" if @encryption_iv
      '#EXT-X-KEY:' + attrs.join(',')
    end
  else
    nil
  end
end