Class: FormatParser::CR3Parser

Inherits:
Object
  • Object
show all
Includes:
IOUtils
Defined in:
lib/parsers/cr3_parser.rb

Defined Under Namespace

Classes: Decoder

Constant Summary collapse

CR3_MIME_TYPE = 
'image/x-canon-cr3'
MAGIC_BYTES = 
'ftypcrx '

Constants included from IOUtils

IOUtils::INTEGER_DIRECTIVES

Instance Method Summary collapse

Methods included from IOUtils

#read_bytes, #read_fixed_point, #read_int, #safe_read, #safe_skip, #skip_bytes

Instance Method Details

#call(io) ⇒ Object 



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# File 'lib/parsers/cr3_parser.rb', line 12

def call(io)
  @buf = FormatParser::IOConstraint.new(io)

  return unless matches_cr3_definition?

  box_tree = Measurometer.instrument('format_parser.cr3_parser.decoder.build_box_tree') do
    Decoder.new.build_box_tree(0xffffffff, @buf)
  end
  moov_box = box_tree.find { |box| box.type == 'moov' }
  cmt1_box = moov_box&.first_descendent('CMT1')
  return unless cmt1_box

  width = cmt1_box.fields[:image_width]
  height = cmt1_box.fields[:image_length]
  rotated = cmt1_box.fields[:rotated]
  orientation = cmt1_box.fields[:orientation_sym]
  FormatParser::Image.new(
    format: :cr3,
    content_type: CR3_MIME_TYPE,
    width_px: width,
    height_px: height,
    orientation: orientation,
    display_width_px: rotated ? height : width,
    display_height_px: rotated ? width : height,
    intrinsics: {
      box_tree: box_tree,
      exif: cmt1_box.fields,
    },
  )
end

#likely_match?(filename) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/parsers/cr3_parser.rb', line 8

def likely_match?(filename)
  filename =~ /\.cr3$/i
end