Class: Muse::WavHeader

Inherits:
Object
  • Object
show all
Defined in:
lib/muse/wav.rb

Constant Summary collapse

SAMPLE_RATE = 
44100

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename, stream_size) ⇒ WavHeader

Returns a new instance of WavHeader.



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# File 'lib/muse/wav.rb', line 60

def initialize(filename, stream_size)
  @sample_rate = SAMPLE_RATE
  @file = File.open(filename, "wb")

  @riff_chunk = RiffChunk.new
  @riff_chunk.chunk_id = "RIFF".unpack("N").first
  @riff_chunk.format = "WAVE".unpack("N").first

  @format_chunk = FormatChunk.new
  @format_chunk.chunk_id = "fmt ".unpack("N").first
  @format_chunk.chunk_size = 16
  @format_chunk.audio_format = 1
  @format_chunk.num_channels = 2
  @format_chunk.bits_per_sample = 16
  @format_chunk.sample_rate =  @sample_rate
  @format_chunk.byte_rate = @format_chunk.sample_rate * @format_chunk.num_channels * @format_chunk.bits_per_sample/2
  @format_chunk.block_align = @format_chunk.num_channels * @format_chunk.bits_per_sample/2
  
  @data_chunk = DataChunk.new
  @data_chunk.chunk_id = "data".unpack("N").first
  @data_chunk.chunk_size = stream_size * @format_chunk.num_channels * @format_chunk.bits_per_sample/8
  @riff_chunk.chunk_size = 36 + @data_chunk.chunk_size
  
  @wav = WavFormat.new
  @wav.riff_chunk = @riff_chunk
  @wav.format_chunk = @format_chunk
  @wav.data_chunk = @data_chunk
  @wav.write(@file)
  @file.close
end

Instance Attribute Details

#data_chunk ⇒ Object (readonly)

Returns the value of attribute data_chunk.



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# File 'lib/muse/wav.rb', line 58

def data_chunk
  @data_chunk
end

#file ⇒ Object (readonly)

Returns the value of attribute file.



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# File 'lib/muse/wav.rb', line 58

def file
  @file
end

#format_chunk ⇒ Object (readonly)

Returns the value of attribute format_chunk.



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# File 'lib/muse/wav.rb', line 58

def format_chunk
  @format_chunk
end

#riff_chunk ⇒ Object (readonly)

Returns the value of attribute riff_chunk.



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# File 'lib/muse/wav.rb', line 58

def riff_chunk
  @riff_chunk
end

#sample_rate ⇒ Object (readonly)

Returns the value of attribute sample_rate.



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# File 'lib/muse/wav.rb', line 58

def sample_rate
  @sample_rate
end

#wav ⇒ Object (readonly)

Returns the value of attribute wav.



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# File 'lib/muse/wav.rb', line 58

def wav
  @wav
end