Class: NuWav::Chunk

Inherits:
Object
  • Object
show all
Defined in:
lib/nu_wav/chunk.rb

Direct Known Subclasses

BextChunk, CartChunk, DataChunk, FactChunk, FmtChunk, MextChunk

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id = nil, size = nil, raw = nil) ⇒ Chunk

Returns a new instance of Chunk.



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# File 'lib/nu_wav/chunk.rb', line 12

def initialize(id=nil, size=nil, raw=nil)
  @id, @size, @raw = id, size, raw
end

Instance Attribute Details

#id ⇒ Object

Returns the value of attribute id.



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# File 'lib/nu_wav/chunk.rb', line 3

def id
  @id
end

#pad_byte ⇒ Object

Returns the value of attribute pad_byte.



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# File 'lib/nu_wav/chunk.rb', line 3

def pad_byte
  @pad_byte
end

#raw ⇒ Object

Returns the value of attribute raw.



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# File 'lib/nu_wav/chunk.rb', line 3

def raw
  @raw
end

#size ⇒ Object

Returns the value of attribute size.



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# File 'lib/nu_wav/chunk.rb', line 3

def size
  @size
end

Class Method Details

.parse(id, size, file) ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 5

def self.parse(id, size, file)
  raw = file.read(size)
  chunk = self.new(id, size, raw)
  chunk.parse
  return chunk
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 16

def parse
end

#read_char(start, length = (@raw.length-start)) ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 27

def read_char(start, length=(@raw.length-start))
  (@raw[start..(start+length-1)] || '').strip
end

#read_dword(start) ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 19

def read_dword(start)
  @raw[start..(start+3)].unpack('V').first
end

#read_word(start) ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 23

def read_word(start)
  @raw[start..(start+1)].unpack('v').first
end

#to_binary(options = {}) ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 52

def to_binary(options={})
end

#write_char(val, length = nil) ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 41

def write_char(val, length=nil)
  val ||= ''
  val = val.to_s
  length ||= val.length
  # NuWav::WaveFile.log "length:#{length} val.length:#{val.length} val:#{val}"
  padding = "\0" * [(length - val.length), 0].max
  out = val[0,length] + padding
  # NuWav::WaveFile.log out
  out
end

#write_dword(val) ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 31

def write_dword(val)
  val ||= 0
  [val].pack('V')
end

#write_word(val) ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 36

def write_word(val)
  val ||= 0
  [val].pack('v')
end