text: #! /usr/bin/env python
  
  from numpy.testing import TestCase, assert_equal
  from numpy import sin, arange, mean, median, isnan, pi
  from aubio import fvec, pitch, freqtomidi, float_type
  
  class aubio_pitch_Good_Values(TestCase):
  
      def skip_test_new_default(self):
          " creating a pitch object without parameters "
          p = pitch()
          assert_equal ( [p.method, p.buf_size, p.hop_size, p.samplerate],
              ['default', 1024, 512, 44100])
  
      def test_run_on_silence(self):
          " creating a pitch object with parameters "
          p = pitch('default', 2048, 512, 32000)
          assert_equal ( [p.method, p.buf_size, p.hop_size, p.samplerate],
              ['default', 2048, 512, 32000])
  
      def test_run_on_zeros(self):
          " running on silence gives 0 "
          p = pitch('default', 2048, 512, 32000)
          f = fvec (512)
          for _ in range(10): assert_equal (p(f), 0.)
  
      def test_run_on_ones(self):
          " running on ones gives 0 "
          p = pitch('default', 2048, 512, 32000)
          f = fvec (512)
          f[:] = 1
          for _ in range(10): assert_equal (p(f), 0.)
  
  class aubio_pitch_Sinusoid(TestCase):
  
      def run_pitch_on_sinusoid(self, method, buf_size, hop_size, samplerate, freq):
          # create pitch object
          p = pitch(method, buf_size, hop_size, samplerate)
          # duration in seconds
          seconds = .3
          # duration in samples
          duration =  seconds * samplerate
          # increase to the next multiple of hop_size
          duration = duration - duration % hop_size + hop_size;
          # build sinusoid
          sinvec = self.build_sinusoid(duration, freq, samplerate)
  
          self.run_pitch(p, sinvec, freq)
  
      def build_sinusoid(self, length, freq, samplerate):
          return sin( 2. * pi * arange(length).astype(float_type) * freq / samplerate)
  
      def run_pitch(self, p, input_vec, freq):
          pitches, errors = [], []
          input_blocks = input_vec.reshape((-1, p.hop_size))
          for new_block in input_blocks:
              pitch = p(new_block)[0]
              pitches.append(pitch)
              errors.append(1. - freqtomidi(pitch) / freqtomidi(freq))
          assert_equal ( len(input_blocks), len(pitches) )
          assert_equal ( isnan(pitches), False )
          # cut the first candidates
          #cut = ( p.buf_size - p.hop_size ) / p.hop_size
          pitches = pitches[2:]
          errors = errors[2:]
          # check that the mean of all relative errors is less than 10%
          #assert abs (mean(errors) ) < 0.1, pitches
          assert abs (median(errors) ) < 0.06, "median of relative errors is bigger than 0.06 (%f)\n found %s\n errors %s" % (mean(errors), pitches, errors)
          #print 'len(pitches), cut:', len(pitches), cut
          #print 'median errors: ', median(errors), 'median pitches: ', median(pitches)
  
  pitch_algorithms = [ "default", "yinfft", "yin", "yinfast", "schmitt", "mcomb", "fcomb" , "specacf" ]
  pitch_algorithms = [ "default", "yinfft", "yin", "yinfast", "schmitt", "mcomb", "fcomb" ]
  
  #freqs = [ 27.5, 55., 110., 220., 440., 880., 1760., 3520. ]
  freqs = [             110., 220., 440., 880., 1760., 3520. ]
  signal_modes = []
  for freq in freqs:
      signal_modes += [
          ( 4096,  2048, 44100, freq ),
          ( 2048,  512, 44100, freq ),
          ( 2048, 1024, 44100, freq ),
          ( 2048, 1024, 32000, freq ),
          ]
  
  freqs = [ ] #55., 110., 220., 440., 880., 1760., 3520. ]
  for freq in freqs:
      signal_modes += [
          ( 2048, 1024, 22050, freq ),
          ( 1024,  256, 16000, freq ),
          ( 1024,  256, 8000,  freq ),
          ( 1024, 512+256, 8000, freq ),
          ]
  
  """
  signal_modes = [
          ( 4096,  512, 44100, 2.*882. ),
          ( 4096,  512, 44100, 882. ),
          ( 4096,  512, 44100, 440. ),
          ( 2048,  512, 44100, 440. ),
          ( 2048, 1024, 44100, 440. ),
          ( 2048, 1024, 44100, 440. ),
          ( 2048, 1024, 32000, 440. ),
          ( 2048, 1024, 22050, 440. ),
          ( 1024,  256, 16000, 440. ),
          ( 1024,  256, 8000,  440. ),
          ( 1024, 512+256, 8000, 440. ),
          ]
  """
  
  def create_test (algo, mode):
      def do_test_pitch(self):
          self.run_pitch_on_sinusoid(algo, mode[0], mode[1], mode[2], mode[3])
      return do_test_pitch
  
  for algo in pitch_algorithms:
      for mode in signal_modes:
          _test_method = create_test (algo, mode)
          _test_method.__name__ = 'test_pitch_%s_%d_%d_%dHz_sin_%.0f' % ( algo,
                  mode[0], mode[1], mode[2], mode[3] )
          setattr (aubio_pitch_Sinusoid, _test_method.__name__, _test_method)
  
  if __name__ == '__main__':
      from unittest import main
      main()
  