def run_once(self):
"""Entry point of this test."""
self.chrome.browser.platform.SetHTTPServerDirectories(self.bindir)
video_url = self.chrome.browser.platform.http_server.UrlOf(
os.path.join(self.bindir, 'youtube.html'))
logging.info('Playing back youtube media file %s.', video_url)
noise_file = os.path.join(self.resultsdir, "noise.wav")
recorded_file = os.path.join(self.resultsdir, "recorded.wav")
loopback_file = os.path.join(self.resultsdir, "loopback.wav")
# Record a sample of "silence" to use as a noise profile.
cras_utils.capture(noise_file, duration=3)
# Play a video and record the audio output
self.play_video(self.chrome.browser.tabs[0], video_url)
p1 = cmd_utils.popen(
cras_utils.capture_cmd(recorded_file, duration=TEST_DURATION))
p2 = cmd_utils.popen(
cras_utils.loopback_cmd(loopback_file, duration=TEST_DURATION))
cmd_utils.wait_and_check_returncode(p1, p2)
# See if we recorded something
loopback_stats = [
audio_helper.get_channel_sox_stat(loopback_file, i) for i in (1, 2)
]
logging.info('loopback stats: %s', [str(s) for s in loopback_stats])
rms_value = audio_helper.reduce_noise_and_get_rms(
recorded_file, noise_file)[0]
self.write_perf_keyval({'rms_value': rms_value})
def rms_test(self, tab, media_file, noiseprof_file, test_duration):
logging.info('rms test on media file %s.', media_file)
recorded_file = os.path.join(self.resultsdir, 'recorded.wav')
loopback_file = os.path.join(self.resultsdir, 'loopback.wav')
# Plays the media_file in the browser.
self.play_media(tab, media_file)
# Record the audio output and also the CRAS loopback output.
p1 = cmd_utils.popen(
cras_utils.capture_cmd(recorded_file, duration=test_duration))
p2 = cmd_utils.popen(
cras_utils.loopback_cmd(loopback_file, duration=test_duration))
cmd_utils.wait_and_check_returncode(p1, p2)
# See if we recorded something.
# We captured two channels of audio in the CRAS loopback.
# The RMS values are for debugging only.
loopback_stats = [
audio_helper.get_channel_sox_stat(loopback_file, i) for i in (1, 2)
]
logging.info('loopback stats: %s', [str(s) for s in loopback_stats])
reduced_file = tempfile.NamedTemporaryFile()
sox_utils.noise_reduce(recorded_file, reduced_file.name,
noiseprof_file)
rms = audio_helper.get_rms(reduced_file.name)[0]
self._rms_values['%s_rms_value' % media_file.replace('.', '_')] = rms
# Make sure the audio can be played to the end.
self.wait_player_end(tab)
def start(self, data_format):
"""Starts recording.
Starts recording subprocess. It can be stopped by calling stop().
@param data_format: A dict containing:
file_type: 'raw'.
sample_format: 'S16_LE' for 16-bit signed integer in
little-endian.
channel: channel number.
rate: sampling rate.
@raises: RecorderError: If recording subprocess is terminated
unexpectedly.
"""
self._capture_subprocess = cmd_utils.popen(
cras_utils.capture_cmd(capture_file=self.file_path,
duration=None,
channels=data_format['channel'],
rate=data_format['rate']))