def _test_audio_disabled(self, policy_value):
"""
Verify the AudioOutputAllowed policy behaves as expected.
Generate and play a sample audio file. When enabled, the difference
between the muted and unmuted RMS should be greater than 0.75. When
disabled, the RMS difference should be less than 0.05.
@param policy_value: policy value for this case.
@raises error.TestFail: In the case where the audio behavior
does not match the policy value.
"""
audio_allowed = policy_value or policy_value is None
RAW_FILE = os.path.join(self.enterprise_dir, 'test_audio.raw')
noise_file = os.path.join(self.resultsdir, 'noise.wav')
recorded_file = os.path.join(self.resultsdir, 'recorded-cras.raw')
recorded_rms = []
# Record a sample of silence to use as a noise profile.
cras_utils.capture(noise_file, duration=2)
logging.info('NOISE: %s', audio_helper.get_rms(noise_file))
# Get two RMS samples: one when muted and one when not
for muted in [False, True]:
cras_utils.set_system_mute(muted)
# Play the audio file and capture the output
self.wait_for_active_stream_count(0)
p = cmd_utils.popen(cras_utils.playback_cmd(RAW_FILE))
try:
self.wait_for_active_stream_count(1)
cras_utils.capture(recorded_file,
duration=self.SAMPLE_DURATION)
if p.poll() is not None:
raise error.TestError('Audio playback stopped prematurely')
finally:
cmd_utils.kill_or_log_returncode(p)
rms_value = audio_helper.reduce_noise_and_get_rms(
recorded_file, noise_file)[0]
logging.info('muted (%s): %s' % (muted, rms_value))
recorded_rms.append(rms_value)
rms_diff = recorded_rms[0] - recorded_rms[1]
self.write_perf_keyval({'rms_diff': rms_diff})
if audio_allowed:
if rms_diff < 0.4:
raise error.TestFail('RMS difference not large enough between '
'mute and ummute: %s' % rms_diff)
else:
if abs(rms_diff) > 0.05:
raise error.TestFail('RMS difference too wide while audio '
'disabled: %s' % rms_diff)
def cras_rms_test_setup():
"""Setups for the cras_rms_tests.
To make sure the line_out-to-mic_in path is all green.
"""
# TODO(owenlin): Now, the nodes are choosed by chrome.
# We should do it here.
cras_utils.set_system_volume(_DEFAULT_PLAYBACK_VOLUME)
cras_utils.set_selected_output_node_volume(_DEFAULT_PLAYBACK_VOLUME)
cras_utils.set_system_mute(False)
cras_utils.set_capture_mute(False)
def _test_unmute_disabled(self, policy_value):
"""
Verify AudioOutputAllowed does not allow unmuting when disabled.
Attempt to unmute the system with CRAS and check the system state
after.
@param policy_value: policy value for this case.
@raises error.TestFail: In the case where the audio behavior
does not match the policy value.
"""
audio_allowed = policy_value or policy_value is None
cras_utils.set_system_mute(False)
if not audio_allowed and not self.is_muted():
raise error.TestFail('System should be muted, but is not')
elif audio_allowed and self.is_muted():
raise error.TestFail('System is muted but should not be')