Class: WSK::Actions::CutFirstSignal

Inherits:
Object
  • Object
show all
Includes:
Common, FFT
Defined in:
lib/WSK/Actions/CutFirstSignal.rb

Constant Summary

Constants included from FFT

FFT::FFTDISTANCE_AVERAGE_HISTORY_TOLERANCE_PC, FFT::FFTDISTANCE_MAX_HISTORY_TOLERANCE_PC, FFT::FFTDIST_MAX, FFT::FFTNBRSAMPLES_HISTORY, FFT::FFTSAMPLE_FREQ, FFT::FFT_SAMPLES_PREFETCH, FFT::FREQINDEX_FIRST, FFT::FREQINDEX_LAST

Instance Method Summary collapse

Methods included from FFT

#getNextFFTSample, #getNextNonSilentSample, #getNextSilentSample, #getSampleBeyondThresholds

Methods included from Common

#accessInputWaveFile, #accessOutputWaveFile, #getWaveFileAccesses, #parsePlugins, #readDuration, #readFFTProfile, #readThresholds, #val2db

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/CutFirstSignal.rb', line 60

def execute(iInputData, oOutputData)
  iInputData.each_raw_buffer(@IdxStartSample) do |iInputRawBuffer, iNbrSamples, iNbrChannels|
    oOutputData.pushRawBuffer(iInputRawBuffer)
  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/CutFirstSignal.rb', line 23

def get_nbr_samples(iInputData)
  @IdxStartSample = 0
  lSilenceThresholds = readThresholds(@SilenceThreshold, iInputData.Header.NbrChannels)
  # Find the first signal
  lIdxSignalSample, lIdxNextAboveThresholds = getNextNonSilentSample(iInputData, 0, lSilenceThresholds, nil, nil, false)
  if (lIdxSignalSample == nil)
    log_warn 'No signal found. Keeping the whole file.'
  else
    lNoiseFFTMaxDistance, lNoiseFFTProfile = readFFTProfile(@NoiseFFTFileName)
    lSilenceDuration = readDuration(@SilenceMin, iInputData.Header.SampleRate)
    lIdxSilenceSample, lSilenceLength, lIdxNextAboveThresholds = getNextSilentSample(iInputData, lIdxSignalSample, lSilenceThresholds, lSilenceDuration, lNoiseFFTProfile, lNoiseFFTMaxDistance, false)
    if (lIdxSilenceSample == nil)
      log_warn "No silence found after the signal beginning at #{lIdxSignalSample}. Keeping the whole file."
    elsif (lSilenceLength == nil)
      # Find the silence length by parsing following data
      lIdxNonSilentSample, lIdxNextAboveThresholds = getNextNonSilentSample(iInputData, lIdxSilenceSample+1, lSilenceThresholds, lNoiseFFTProfile, lNoiseFFTMaxDistance, false)
      if (lIdxNonSilentSample == nil)
        # The file should be empty
        @IdxStartSample = iInputData.NbrSamples-1
      else
        @IdxStartSample = lIdxNonSilentSample
      end
    else
      @IdxStartSample = lIdxSilenceSample + lSilenceLength
    end
  end

  return iInputData.NbrSamples-@IdxStartSample
end