Class: WahWah::Ogg::Page

Inherits:
Object
  • Object
show all
Defined in:
lib/wahwah/ogg/page.rb

Overview

  1. segment_table: number_page_segments Bytes containing the lacing values of all segments in this page. Each Byte contains one lacing value.

Constant Summary collapse

HEADER_SIZE = 
27
HEADER_FORMAT = 
"A4CxQx12C"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file_io) ⇒ Page

Returns a new instance of Page.



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# File 'lib/wahwah/ogg/page.rb', line 106

def initialize(file_io)
  header_content = file_io.read(HEADER_SIZE)
  @capture_pattern, @version, @granule_position, page_segments = header_content.unpack(HEADER_FORMAT) if header_content.size >= HEADER_SIZE

  return unless valid?

  segment_table = file_io.read(page_segments).unpack("C" * page_segments)
  @segments = segment_table.map { |segment_length| file_io.read(segment_length) }
end

Instance Attribute Details

#granule_position ⇒ Object (readonly)

Returns the value of attribute granule_position.



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# File 'lib/wahwah/ogg/page.rb', line 104

def granule_position
  @granule_position
end

#segments ⇒ Object (readonly)

Returns the value of attribute segments.



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# File 'lib/wahwah/ogg/page.rb', line 104

def segments
  @segments
end

Instance Method Details

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/wahwah/ogg/page.rb', line 116

def valid?
  @capture_pattern == "OggS" && @version == 0
end