Class: Hanvox::ProcAudio

Inherits:
Object
  • Object
show all
Defined in:
lib/hanvox/proc_audio.rb

Constant Summary collapse

CHUNK_IDS = 
{:header       => "RIFF",
:format       => "fmt ",
:data         => "data",
:fact         => "fact",
:silence      => "slnt",
:cue          => "cue ",
:playlist     => "plst",
:list         => "list",
:label        => "labl",
:labeled_text => "ltxt",
:note         => "note",
:sample       => "smpl",
:instrument   => "inst" }
PACK_CODES = 
{8 => "C*", 16 => "s*", 32 => "V*"}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path, save_dir = nil) ⇒ ProcAudio

Returns a new instance of ProcAudio.



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# File 'lib/hanvox/proc_audio.rb', line 23

def initialize path, save_dir=nil
  @channels, @data, @results = [], [], []
  @header = {}
  @save_dir = save_dir || `pwd`.gsub("\n", "")
  @path = path

  @file = File.open path
  @oname = File.basename path, ".wav"
  read_header
end

Instance Attribute Details

#channels ⇒ Object

Returns the value of attribute channels.



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# File 'lib/hanvox/proc_audio.rb', line 7

def channels
  @channels
end

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/hanvox/proc_audio.rb', line 7

def data
  @data
end

#file ⇒ Object

Returns the value of attribute file.



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# File 'lib/hanvox/proc_audio.rb', line 7

def file
  @file
end

#header ⇒ Object

Returns the value of attribute header.



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# File 'lib/hanvox/proc_audio.rb', line 7

def header
  @header
end

#oname ⇒ Object

Returns the value of attribute oname.



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# File 'lib/hanvox/proc_audio.rb', line 7

def oname
  @oname
end

#path ⇒ Object

Returns the value of attribute path.



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# File 'lib/hanvox/proc_audio.rb', line 7

def path
  @path
end

#processors ⇒ Object

Returns the value of attribute processors.



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# File 'lib/hanvox/proc_audio.rb', line 7

def processors
  @processors
end

#results ⇒ Object

Returns the value of attribute results.



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# File 'lib/hanvox/proc_audio.rb', line 7

def results
  @results
end

#sample_count ⇒ Object

Returns the value of attribute sample_count.



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# File 'lib/hanvox/proc_audio.rb', line 7

def sample_count
  @sample_count
end

#save_dir ⇒ Object

Returns the value of attribute save_dir.



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# File 'lib/hanvox/proc_audio.rb', line 7

def save_dir
  @save_dir
end

Instance Method Details

#cleanup ⇒ Object 



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# File 'lib/hanvox/proc_audio.rb', line 191

def cleanup
  @channels.each do |c|
    system "rm -f #{c}"
  end
  @file.close

  true
end

#process(opts = {}) ⇒ Object 



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# File 'lib/hanvox/proc_audio.rb', line 34

def process opts={}
  (@header[:channels]).times do |c|
    c += 1
    system "sox #{@path} -s #{oname}_#{c}.wav remix #{c}"
    system "sox #{oname}_#{c}.wav -s #{oname}_#{c}.raw"
    system "rm -f #{oname}_#{c}.wav"
    @channels << "#{oname}_#{c}.raw"
  end

  if opts[:channel].nil?
    @channels.each do |chan|
      process_audio chan
    end
  else
    process_audio @channels[opts[:channel]-1]
  end
  cleanup
end

#process_audio(input) ⇒ Object 



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# File 'lib/hanvox/proc_audio.rb', line 53

def process_audio input
  bname = File.expand_path(File.dirname(input))
  num   = File.basename(input, ".raw").split("_").last
  res   = {}

  #
  # Create the signature database
  #
  raw  = Hanvox::Raw.from_file(input)
  fft  = KissFFT.fftr(8192, 8000, 1, raw.samples)

  freq = raw.to_freq_sig_txt()

  # Save the signature data
  res[:fprint] = freq

  #
  # Create a raw decompressed file
  #

  # Decompress the audio file
  datfile = Tempfile.new("datfile")

  # Data files for audio processing and signal graph
  cnt = 0
  datfile.write(raw.samples.map{|val| cnt +=1; "#{cnt/8000.0} #{val}"}.join("\n"))
  datfile.flush

  # Data files for spectrum plotting
  frefile = Tempfile.new("frefile")

  # Calculate the peak frequencies for the sample
  maxf = 0
  maxp = 0
  tones = {}
  fft.each do |x|
    rank = x.sort{|a,b| a[1].to_i <=> b[1].to_i }.reverse
    rank[0..10].each do |t|
      f = t[0].round
      p = t[1].round
      next if f == 0
      next if p < 1
      tones[ f ] ||= []
      tones[ f ] << t
      if(t[1] > maxp)
        maxf = t[0]
        maxp = t[1]
      end
    end
  end

  # Save the peak frequency
  res[:peak_freq] = maxf

  # Calculate average frequency and peaks over time
  avg = {}
  pks = []
  pkz = []
  fft.each do |slot|
    pks << slot.sort{|a,b| a[1] <=> b[1] }.reverse[0]
    pkz << slot.sort{|a,b| a[1] <=> b[1] }.reverse[0..9]
    slot.each do |f|
      avg[ f[0] ] ||= 0
      avg[ f[0] ] +=  f[1]
    end
  end

  # Save the peak frequencies over time
  res[:peak_freq_data] = pks.map{|f| "#{f[0]}-#{f[1]}" }.join(" ")

  # Generate the frequency file
  avg.keys.sort.each do |k|
    avg[k] = avg[k] / fft.length
    frefile.write("#{k} #{avg[k]}\n")
  end
  frefile.flush

  # Count significant frequencies across the sample
  fcnt = {}
  0.step(4000, 5) {|f| fcnt[f] = 0 }
  pkz.each do |fb|
    fb.each do |f|
      fdx = ((f[0] / 5.0).round * 5.0).to_i
      fcnt[fdx]  += 0.1
    end
  end

  @data << { :raw  => raw, :freq => freq, :fcnt => fcnt, :fft  => fft,
            :pks  => pks, :pkz  => pkz, :maxf => maxf, :maxp => maxp }

  sigs = Signatures::Base.new @data.last
  res[:line_type] = sigs.process

  # Plot samples to a graph
  plotter = Tempfile.new("gnuplot")

  plotter.puts("set ylabel \"Signal\"")
  plotter.puts("set xlabel \"Seconds\"")
  plotter.puts("set terminal png medium size 640,480 transparent")
  plotter.puts("set output \"#{save_dir}/#{oname}_#{num}_big.png\"")
  plotter.puts("plot \"#{datfile.path}\" using 1:2 title \"#{num}\" with lines")
  plotter.puts("set output \"#{save_dir}/#{oname}_#{num}_big_dots.png\"")
  plotter.puts("plot \"#{datfile.path}\" using 1:2 title \"#{num}\" with dots")

  plotter.puts("set terminal png medium size 640,480 transparent")
  plotter.puts("set ylabel \"Power\"")
  plotter.puts("set xlabel \"Frequency\"")
  plotter.puts("set output \"#{save_dir}/#{oname}_#{num}_big_freq.png\"")
  plotter.puts("plot \"#{frefile.path}\" using 1:2 title \"#{num} - Peak #{maxf.round}hz\" with lines")

  plotter.puts("set ylabel \"Signal\"")
  plotter.puts("set xlabel \"Seconds\"")
  plotter.puts("set terminal png small size 160,120 transparent")
  plotter.puts("set format x ''")
  plotter.puts("set format y ''")
  plotter.puts("set output \"#{save_dir}/#{oname}_#{num}_sig.png\"")
  plotter.puts("plot \"#{datfile.path}\" using 1:2 notitle with lines")

  plotter.puts("set ylabel \"Power\"")
  plotter.puts("set xlabel \"Frequency\"")
  plotter.puts("set terminal png small size 160,120 transparent")
  plotter.puts("set format x ''")
  plotter.puts("set format y ''")
  plotter.puts("set output \"#{save_dir}/#{oname}_#{num}_sig_freq.png\"")
  plotter.puts("plot \"#{frefile.path}\" using 1:2 notitle with lines")
  plotter.flush

  puts `gnuplot #{plotter.path}&`
  File.unlink(plotter.path)
  File.unlink(datfile.path)
  File.unlink(frefile.path)
  plotter.close
  datfile.close
  frefile.path

  @results << res
end