Module: MediaInfoNative::AttrReaders

Included in:
BaseStream
Defined in:
lib/mediainfo-native/attr_readers.rb

Instance Method Summary collapse

Instance Method Details

#mediainfo_attr_reader(attribute, mediainfo_key) ⇒ Object 



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# File 'lib/mediainfo-native/attr_readers.rb', line 12

def mediainfo_attr_reader(attribute, mediainfo_key)     
  attribute_before_type_cast = "#{attribute}_before_type_cast"
  
  define_method attribute_before_type_cast do
    instance_variable_get("@#{attribute_before_type_cast}") || instance_variable_set("@#{attribute_before_type_cast}", lookup(mediainfo_key))
  end
  
  define_method attribute do
    if v = instance_variable_get("@#{attribute}")
      v
    else
      v = send(attribute_before_type_cast)
      v = yield v if v and block_given?
      
      instance_variable_set("@#{attribute}", v)
    end
  end

  supported_attribute(attribute)
end

#mediainfo_date_reader(*a) ⇒ Object 



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# File 'lib/mediainfo-native/attr_readers.rb', line 69

def mediainfo_date_reader(*a)
  # Mediainfo can return wrong timestamps, so we have to correct them before
  # we let ruby try to parse.
  # Also we now catch exceptions.
  mediainfo_attr_reader(*a) do |v|
    begin
      Time.parse(v.gsub('-00', '-01'))
    rescue
      Time.now
    end
  end
end

#mediainfo_duration_reader(*a) ⇒ Object 



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# File 'lib/mediainfo-native/attr_readers.rb', line 33

def mediainfo_duration_reader(*a)
  mediainfo_attr_reader *a do |v|
    case
    when v.include?(":")
      # If it is like 00:20:30.600
      splitted = v.split(/:|\./)
      (splitted[0].to_i * 60 * 60 * 1000) + 
        (splitted[1].to_i * 60 * 1000) + 
        (splitted[2].to_i * 1000) +
        (splitted[3].to_i)
    when v.include?('ms')
      # If it is like '20mn 30s 600ms'
      t = 0
      v.split(/\s+/).each do |tf|
        case tf
        # TODO: Haven't actually seen how they represent hours yet 
        # but hopefully this is ok.. :\
        when /\d+h/  then t += tf.to_i * 60 * 60 * 1000
        when /\d+mn/ then t += tf.to_i * 60 * 1000
        when /\d+ms/ then t += tf.to_i
        when /\d+s/  then t += tf.to_i * 1000
        end
      end
      t
    when /\A\d+\z/ =~ v
      v.to_i
    when /\A\d+\.\d+\z/ =~ v
      v.to_f.round
    when v.empty?
      nil
    else
      raise "unexpected time fragment! please report bug!"
    end
  end
end

#mediainfo_int_reader(*a) ⇒ Object 



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# File 'lib/mediainfo-native/attr_readers.rb', line 82

def mediainfo_int_reader(*a)
  mediainfo_attr_reader(*a) { |v| v.gsub(/\D+/, "").to_i }
end

#supported_attribute(attribute) ⇒ Object 



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# File 'lib/mediainfo-native/attr_readers.rb', line 3

def supported_attribute(attribute)
  @supported_attributes ||= []
  @supported_attributes << attribute
end

#supported_attributes ⇒ Object 



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# File 'lib/mediainfo-native/attr_readers.rb', line 8

def supported_attributes
  @supported_attributes || []
end