Class: BMFF::Box::SampleEncryption

Inherits:
Full
  • Object
show all
Defined in:
lib/bmff/box/sample_encryption.rb

Overview

vim: set expandtab tabstop=2 shiftwidth=2 softtabstop=2 autoindent:

Defined Under Namespace

Classes: Entry, Sample

Constant Summary collapse

DEFAULT_IV_SIZE = 
8
@@cached_root_object_id = 
nil
@@cached_track_encryption = 
nil

Instance Attribute Summary collapse

Attributes inherited from Full

#flags, #version

Attributes inherited from Base

#io, #largesize, #offset, #parent, #size, #type, #usertype

Instance Method Summary collapse

Methods inherited from Base

#actual_size, #container?, #eob?, #parse, register_box, register_uuid_box, #remaining_size, #root, #seek_to_end

Instance Attribute Details

#algorithm_id ⇒ Object

Returns the value of attribute algorithm_id.



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# File 'lib/bmff/box/sample_encryption.rb', line 5

def algorithm_id
  @algorithm_id
end

#iv_size ⇒ Object

Returns the value of attribute iv_size.



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# File 'lib/bmff/box/sample_encryption.rb', line 5

def iv_size
  @iv_size
end

#kid ⇒ Object

Returns the value of attribute kid.



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# File 'lib/bmff/box/sample_encryption.rb', line 5

def kid
  @kid
end

#sample_count ⇒ Object

Returns the value of attribute sample_count.



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# File 'lib/bmff/box/sample_encryption.rb', line 5

def sample_count
  @sample_count
end

#samples ⇒ Object

Returns the value of attribute samples.



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# File 'lib/bmff/box/sample_encryption.rb', line 5

def samples
  @samples
end

Instance Method Details

#parse_data ⇒ Object 



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# File 'lib/bmff/box/sample_encryption.rb', line 18

def parse_data
  super
  if flags & 0x01 > 0
    @algorithm_id = io.get_uint24
    @iv_size = io.get_uint8
    @kid = io.get_uuid
  end
  @sample_count = io.get_uint32
  @samples = []
  @sample_count.times do
    sample = Sample.new
    if @iv_size
      iv_size_to_read = @iv_size
    else
      iv_size_to_read = default_iv_size
    end
    sample.initialization_vector = io.get_byte(iv_size_to_read)
    if flags & 0x02 > 0
      sample.number_of_entries = io.get_uint16
      sample.entries = []
      sample.number_of_entries.times do
        entry = Entry.new
        entry.bytes_of_clear_data = io.get_uint16
        entry.bytes_of_encrypted_data = io.get_uint32
        sample.entries << entry
      end
    end
    @samples << sample
  end
end