Class: NuWav::FmtChunk

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

Instance Attribute Summary collapse

Attributes inherited from Chunk

#id, #pad_byte, #raw, #size

Instance Method Summary collapse

Methods inherited from Chunk

#initialize, parse, #read_char, #read_dword, #read_word, #write_char, #write_dword, #write_word

Constructor Details

This class inherits a constructor from NuWav::Chunk

Instance Attribute Details

#block_align ⇒ Object

Returns the value of attribute block_align.



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# File 'lib/nu_wav/chunk.rb', line 72

def block_align
  @block_align
end

#byte_rate ⇒ Object

Returns the value of attribute byte_rate.



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# File 'lib/nu_wav/chunk.rb', line 72

def byte_rate
  @byte_rate
end

#compression_code ⇒ Object

Returns the value of attribute compression_code.



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# File 'lib/nu_wav/chunk.rb', line 72

def compression_code
  @compression_code
end

#extra ⇒ Object

Returns the value of attribute extra.



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# File 'lib/nu_wav/chunk.rb', line 72

def extra
  @extra
end

#extra_size ⇒ Object

Returns the value of attribute extra_size.



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# File 'lib/nu_wav/chunk.rb', line 72

def extra_size
  @extra_size
end

#head_bit_rate ⇒ Object

Returns the value of attribute head_bit_rate.



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# File 'lib/nu_wav/chunk.rb', line 72

def head_bit_rate
  @head_bit_rate
end

#head_emphasis ⇒ Object

Returns the value of attribute head_emphasis.



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# File 'lib/nu_wav/chunk.rb', line 72

def head_emphasis
  @head_emphasis
end

#head_flags ⇒ Object

Returns the value of attribute head_flags.



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# File 'lib/nu_wav/chunk.rb', line 72

def head_flags
  @head_flags
end

#head_layer ⇒ Object

Returns the value of attribute head_layer.



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# File 'lib/nu_wav/chunk.rb', line 72

def head_layer
  @head_layer
end

#head_mode ⇒ Object

Returns the value of attribute head_mode.



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# File 'lib/nu_wav/chunk.rb', line 72

def head_mode
  @head_mode
end

#head_mode_ext ⇒ Object

Returns the value of attribute head_mode_ext.



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# File 'lib/nu_wav/chunk.rb', line 72

def head_mode_ext
  @head_mode_ext
end

#number_of_channels ⇒ Object

Returns the value of attribute number_of_channels.



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# File 'lib/nu_wav/chunk.rb', line 72

def number_of_channels
  @number_of_channels
end

#pts_high ⇒ Object

Returns the value of attribute pts_high.



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# File 'lib/nu_wav/chunk.rb', line 72

def pts_high
  @pts_high
end

#pts_low ⇒ Object

Returns the value of attribute pts_low.



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# File 'lib/nu_wav/chunk.rb', line 72

def pts_low
  @pts_low
end

#sample_bits ⇒ Object

Returns the value of attribute sample_bits.



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# File 'lib/nu_wav/chunk.rb', line 72

def sample_bits
  @sample_bits
end

#sample_rate ⇒ Object

Returns the value of attribute sample_rate.



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# File 'lib/nu_wav/chunk.rb', line 72

def sample_rate
  @sample_rate
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 75

def parse
  NuWav::WaveFile.log "@raw.size = #{@raw.size}"
  @compression_code =   read_word(0)
  @number_of_channels = read_word(2)
  @sample_rate =        read_dword(4)
  @byte_rate =          read_dword(8)
  @block_align =        read_word(12)
  @sample_bits =        read_word(14)
  @extra_size =         read_word(16)
  
  if (@compression_code.to_i == MPEG_COMPRESSION)
    @head_layer =       read_word(18)
    @head_bit_rate =    read_dword(20)
    @head_mode =        read_word(24)
    @head_mode_ext =    read_word(26)
    @head_emphasis =    read_word(28)
    @head_flags =       read_word(30)
    @pts_low =          read_dword(32)
    @pts_high =         read_dword(36)
  end
end

#to_binary(options = {}) ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 97

def to_binary(options={})
  out = ''
  out += write_word(@compression_code)
  out += write_word(@number_of_channels)
  out += write_dword(@sample_rate)
  out += write_dword(@byte_rate)
  out += write_word(@block_align)
  out += write_word(@sample_bits)
  out += write_word(@extra_size)
  
  if (@compression_code.to_i == MPEG_COMPRESSION)
    out += write_word(@head_layer)
    out += write_dword(@head_bit_rate)
    out += write_word(@head_mode)
    out += write_word(@head_mode_ext)
    out += write_word(@head_emphasis)
    out += write_word(@head_flags)
    out += write_dword(@pts_low)
    out += write_dword(@pts_high)
  end
  "fmt " + write_dword(out.size) + out
end

#to_s ⇒ Object 



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# File 'lib/nu_wav/chunk.rb', line 120

def to_s
  extra = if (@compression_code.to_i == MPEG_COMPRESSION)
    ", head_layer:#{head_layer}, head_bit_rate:#{head_bit_rate}, head_mode:#{head_mode}, head_mode_ext:#{head_mode_ext}, head_emphasis:#{head_emphasis}, head_flags:#{head_flags}, pts_low:#{pts_low}, pts_high:#{pts_high}"
  else
    ""
  end
  "<chunk type:fmt compression_code:#{compression_code}, number_of_channels:#{number_of_channels}, sample_rate:#{sample_rate}, byte_rate:#{byte_rate}, block_align:#{block_align}, sample_bits:#{sample_bits}, extra_size:#{extra_size} #{extra} />"
end