Module: Titlekit::SSA

Defined in:
lib/titlekit/parsers/ssa.rb

Defined Under Namespace

Classes: Events, ScriptInfo, Subtitles, V4PStyles

Class Method Summary collapse

Class Method Details

.export(subtitles) ⇒ Object 



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# File 'lib/titlekit/parsers/ssa.rb', line 144

def self.export(subtitles)
  result = ''

  result << "[Script Info]\nScriptType: v4.00\n\n"

  result << "[V4 Styles]\nFormat: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, TertiaryColour, BackColour, Bold, Italic, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\n"
  result << "Style: Default,Arial,16,16777215,16777215,16777215,-2147483640,0,0,1,3,0,2,70,70,40,0,0\n"
  result << "Style: Middle,Arial,16,16777215,16777215,16777215,-2147483640,0,0,1,3,0,10,70,70,40,0,0\n"
  result << "Style: Top,Arial,16,16777215,16777215,16777215,-2147483640,0,0,1,3,0,6,70,70,40,0,0\n"
  
  DEFAULT_PALETTE.each do |color|
    # reordered_color = ""
    # reordered_color << color[4..5]
    # reordered_color << color[2..3]
    # reordered_color << color[0..1]     processed_color = (color[4..5]+color[2..3]+color[0..1]).to_i(16)
    result << "Style: #{color},Arial,16,#{processed_color},#{processed_color},#{processed_color},-2147483640,0,0,1,3,0,2,70,70,40,0,0\n"
  end

  result << "\n" # Close styles section

  result << "[Events]\nFormat: Marked, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\n"
  subtitles.each do |subtitle|
    fields = [
      'Dialogue: 0',  # Format: Marked
      SSA.build_timecode(subtitle[:start]),  # Start
      SSA.build_timecode(subtitle[:end]),  # End
      subtitle[:style] || 'Default',  # Style
      '',  # Name
      '0000',  # MarginL
      '0000',  # MarginR
      '0000',  # MarginV
      '',# Effect
      subtitle[:lines].gsub("\n", '\N')  # Text
    ]

    result << (fields.join(',') + "\n")
  end

  return result
end

.import(string) ⇒ Object

Parses the supplied string and returns the results.



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# File 'lib/titlekit/parsers/ssa.rb', line 66

def self.import(string)
  Treetop.load(File.join(__dir__, 'ssa'))
  parser = SSAParser.new
  syntax_tree = parser.parse(string)

  if syntax_tree
    return syntax_tree.build
  else
    failure = "failure_index #{parser.failure_index}\n"
    failure += "failure_line #{parser.failure_line}\n"
    failure += "failure_column #{parser.failure_column}\n"
    failure += "failure_reason #{parser.failure_reason}\n"

    raise failure
  end 
end

.master(subtitles) ⇒ Object

Master the subtitles for best possible usage of the format’s features.

Parameters:

  • subtitles (Array<Hash>) —

    the subtitles to master



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# File 'lib/titlekit/parsers/ssa.rb', line 86

def self.master(subtitles)
  tracks = subtitles.map { |subtitle| subtitle[:track] }.uniq

  if tracks.length == 1
  
    # maybe styling? aside that: nada más!

  elsif (2..3).include?(tracks.length)

    subtitles.each do |subtitle|
      case tracks.index(subtitle[:track])
      when 0
        subtitle[:style] = 'Default'
      when 1
        subtitle[:style] = 'Top'
      when 2
        subtitle[:style] = 'Middle'
      end
    end

  elsif tracks.length >= 4

    mastered_subtitles = []

    # Determine timeframes with a discrete state
    cuts = subtitles.map { |s| [s[:start], s[:end]] }.flatten.uniq.sort
    frames = []
    cuts.each_cons(2) do |pair|
      frames << { start: pair[0], end: pair[1] }
    end

    frames.each do |frame|
      intersecting = subtitles.select do |subtitle|
        (subtitle[:end] == frame[:end] || subtitle[:start] == frame[:start] ||
        (subtitle[:start] < frame[:start] && subtitle[:end] > frame[:end]))
      end

      if intersecting.any?
        intersecting.sort_by! { |subtitle| tracks.index(subtitle[:track]) }
        intersecting.each do |subtitle|
          new_subtitle = {}
          new_subtitle[:id] = mastered_subtitles.length+1
          new_subtitle[:start] = frame[:start]
          new_subtitle[:end] = frame[:end]

          color = DEFAULT_PALETTE[tracks.index(subtitle[:track]) % DEFAULT_PALETTE.length]
          new_subtitle[:style] = color
          new_subtitle[:lines]  = subtitle[:lines]

          mastered_subtitles << new_subtitle
        end
      end
    end

    subtitles.replace(mastered_subtitles)
  end
end