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@@ -441,6 +441,22 @@ class TC_00_AppVMMixin(object):
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self.skipTest('pulseaudio-utils not installed in VM')
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self.wait_for_pulseaudio_startup(self.testvm1)
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+ def check_audio_sample(self, sample, sfreq):
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+ rec = np.fromstring(sample, dtype=np.float32)
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+ # determine sample size using silence threshold
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+ threshold = 10**-3
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+ rec_size = np.count_nonzero((rec > threshold) | (rec < -threshold))
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+ if not rec_size:
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+ self.fail('only silence detected, no useful audio data')
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+ # find zero crossings
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+ crossings = np.nonzero((rec[1:] > threshold) &
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+ (rec[:-1] < -threshold))[0]
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+ np.seterr('raise')
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+ # compare against sine wave frequency
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+ rec_freq = rec_size/np.mean(np.diff(crossings))
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+ if not sfreq*0.8 < rec_freq < sfreq*1.2:
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+ self.fail('frequency {} not in specified range'
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+ .format(rec_freq))
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def common_audio_playback(self):
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# sine frequency
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@@ -471,16 +487,7 @@ class TC_00_AppVMMixin(object):
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# for some reason sudo do not relay SIGTERM sent above
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subprocess.check_call(['pkill', 'parecord'])
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p.wait()
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- rec = np.fromstring(recorded_audio.file.read(), dtype=np.float32)
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- # find zero crossings
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- crossings = np.nonzero((rec[1:] > 0) & (rec[:-1] < 0))[0]
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- np.seterr('raise')
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- # compare against sine wave frequency
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- rec_freq = len(rec)/np.mean(np.diff(crossings))
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- if not sfreq*0.8 < rec_freq < sfreq*1.2:
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- self.fail('played sound not found in dom0, '
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- 'frequency {} not in specified range'
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- .format(rec_freq))
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+ self.check_audio_sample(recorded_audio.file.read(), sfreq)
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def _configure_audio_recording(self, vm):
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'''Connect VM's output-source to sink monitor instead of mic'''
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@@ -558,14 +565,7 @@ class TC_00_AppVMMixin(object):
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recorded_audio, _ = self.loop.run_until_complete(
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self.testvm1.run_for_stdio('cat audio_rec.raw'))
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- rec = np.fromstring(recorded_audio, dtype=np.float32)
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- crossings = np.nonzero((rec[1:] > 0) & (rec[:-1] < 0))[0]
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- np.seterr('raise')
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- rec_freq = len(rec)/np.mean(np.diff(crossings))
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- if not sfreq*0.8 < rec_freq < sfreq*1.2:
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- self.fail('VM not recorded expected data, '
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- 'frequency {} not in specified range'
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- .format(rec_freq))
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+ self.check_audio_sample(recorded_audio, sfreq)
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@unittest.skipUnless(spawn.find_executable('parecord'),
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"pulseaudio-utils not installed in dom0")
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