1 # Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 import logging, os, time 6 7 from autotest_lib.client.common_lib import error 8 from autotest_lib.client.cros.audio import audio_helper 9 from autotest_lib.client.cros.audio import alsa_utils 10 from autotest_lib.client.cros.audio import cmd_utils 11 12 13 TEST_DURATION = 1 14 15 class audio_AlsaLoopback(audio_helper.alsa_rms_test): 16 """Verifies audio playback and capture function.""" 17 version = 1 18 19 def run_once(self): 20 """Entry point of this test.""" 21 22 # Multitone wav file lasts 10 seconds 23 wav_path = os.path.join(self.bindir, '10SEC.wav') 24 25 noise_file = os.path.join(self.resultsdir, 'hw_noise.wav') 26 recorded_file = os.path.join(self.resultsdir, 'hw_recorded.wav') 27 28 # Record a sample of "silence" to use as a noise profile. 29 alsa_utils.record(noise_file, duration=1) 30 31 p = cmd_utils.popen(alsa_utils.playback_cmd(wav_path)) 32 try: 33 # Wait one second to make sure the playback has been started. 34 time.sleep(1) 35 alsa_utils.record(recorded_file, duration=TEST_DURATION) 36 37 # Make sure the audio is still playing. 38 if p.poll() != None: 39 raise error.TestError('playback stopped') 40 finally: 41 cmd_utils.kill_or_log_returncode(p) 42 43 rms_value = audio_helper.reduce_noise_and_get_rms( 44 recorded_file, noise_file)[0] 45 46 self.write_perf_keyval({'rms_value': rms_value}) 47 48
