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audio: add silence threshold

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This commit is contained in:
Dmitry Fedorov 2020-06-24 15:03:10 +03:00
parent 362cf006eb
commit a68144e688
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GPG Key ID: C61C7F61C4D85F8D
1 changed files with 18 additions and 18 deletions
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36
qubes/tests/integ/vm_qrexec_gui.py
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@ -441,6 +441,22 @@ class TC_00_AppVMMixin(object):
self.skipTest('pulseaudio-utils not installed in VM') self.skipTest('pulseaudio-utils not installed in VM')
self.wait_for_pulseaudio_startup(self.testvm1) self.wait_for_pulseaudio_startup(self.testvm1)
def check_audio_sample(self, sample, sfreq):
rec = np.fromstring(sample, dtype=np.float32)
# determine sample size using silence threshold
threshold = 10**-3
rec_size = np.count_nonzero((rec > threshold) | (rec < -threshold))
if not rec_size:
self.fail('only silence detected, no useful audio data')
# find zero crossings
crossings = np.nonzero((rec[1:] > threshold) &
(rec[:-1] < -threshold))[0]
np.seterr('raise')
# compare against sine wave frequency
rec_freq = rec_size/np.mean(np.diff(crossings))
if not sfreq*0.8 < rec_freq < sfreq*1.2:
self.fail('frequency {} not in specified range'
.format(rec_freq))
def common_audio_playback(self): def common_audio_playback(self):
# sine frequency # sine frequency
@ -471,16 +487,7 @@ class TC_00_AppVMMixin(object):
# for some reason sudo do not relay SIGTERM sent above # for some reason sudo do not relay SIGTERM sent above
subprocess.check_call(['pkill', 'parecord']) subprocess.check_call(['pkill', 'parecord'])
p.wait() p.wait()
rec = np.fromstring(recorded_audio.file.read(), dtype=np.float32) self.check_audio_sample(recorded_audio.file.read(), sfreq)
# find zero crossings
crossings = np.nonzero((rec[1:] > 0) & (rec[:-1] < 0))[0]
np.seterr('raise')
# compare against sine wave frequency
rec_freq = len(rec)/np.mean(np.diff(crossings))
if not sfreq*0.8 < rec_freq < sfreq*1.2:
self.fail('played sound not found in dom0, '
'frequency {} not in specified range'
.format(rec_freq))
def _configure_audio_recording(self, vm): def _configure_audio_recording(self, vm):
'''Connect VM's output-source to sink monitor instead of mic''' '''Connect VM's output-source to sink monitor instead of mic'''
@ -558,14 +565,7 @@ class TC_00_AppVMMixin(object):
recorded_audio, _ = self.loop.run_until_complete( recorded_audio, _ = self.loop.run_until_complete(
self.testvm1.run_for_stdio('cat audio_rec.raw')) self.testvm1.run_for_stdio('cat audio_rec.raw'))
rec = np.fromstring(recorded_audio, dtype=np.float32) self.check_audio_sample(recorded_audio, sfreq)
crossings = np.nonzero((rec[1:] > 0) & (rec[:-1] < 0))[0]
np.seterr('raise')
rec_freq = len(rec)/np.mean(np.diff(crossings))
if not sfreq*0.8 < rec_freq < sfreq*1.2:
self.fail('VM not recorded expected data, '
'frequency {} not in specified range'
.format(rec_freq))
@unittest.skipUnless(spawn.find_executable('parecord'), @unittest.skipUnless(spawn.find_executable('parecord'),
"pulseaudio-utils not installed in dom0") "pulseaudio-utils not installed in dom0")