Class: WSK::Actions::GenSine

Inherits:
Object
  • Object
show all
Defined in:
lib/WSK/Actions/GenSine.rb

Instance Method Summary collapse

Instance Method Details

#execute(iInputData, oOutputData) ⇒ Object

Execute

Parameters

  • iInputData (WSK::Model::InputData): The input data

  • oOutputData (Object): The output data to fill

Return

  • Exception: An error, or nil if success



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# File 'lib/WSK/Actions/GenSine.rb', line 31

def execute(iInputData, oOutputData)
  # Compute values used to create sawtooth
  lMaxValue = 2**(iInputData.Header.NbrBitsPerSample-1)-1
  # Compute the number of complete periods to put in the samples we want
  lNbrSamplesPeriod = iInputData.Header.SampleRate/@Frequency
  lNbrPeriods = @NbrSamples/lNbrSamplesPeriod
  lBuffer = nil
  if (lNbrPeriods > 0)
    # Generate a buffer with a omplete period in it
    lBuffer = []
    lNbrSamplesPeriod.times do |iIdx|
      lBuffer.concat( [(Math.sin((2*Math::PI*iIdx)/lNbrSamplesPeriod)*lMaxValue).round] * iInputData.Header.NbrChannels )
    end
    # Write them
    lNbrPeriods.times do |iIdx|
      oOutputData.pushBuffer(lBuffer)
    end
  end
  lRemainingSamples = @NbrSamples % lNbrSamplesPeriod
  if (lRemainingSamples > 0)
    # Add the remaining part of the buffer
    if (lBuffer == nil)
      # Generate a part of the buffer
      lBuffer = []
      lRemainingSamples.times do |iIdx|
        lBuffer.concat( [(Math.sin((2*Math::PI*iIdx)/lNbrSamplesPeriod)*lMaxValue).round] * iInputData.Header.NbrChannels )
      end
      # Write it
      oOutputData.pushBuffer(lBuffer)
    else
      # Write a part of the already generated buffer
      oOutputData.pushBuffer(lBuffer[0..iInputData.Header.NbrChannels*lRemainingSamples-1])
    end
  end

  return nil
end

#get_nbr_samples(iInputData) ⇒ Object

Get the number of samples that will be written. This is called before execute, as it is needed to write the output file. It is possible to give a majoration: it will be padded with silence.

Parameters

  • iInputData (WSK::Model::InputData): The input data

Return

  • Integer: The number of samples to be written



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# File 'lib/WSK/Actions/GenSine.rb', line 20

def get_nbr_samples(iInputData)
  return @NbrSamples
end