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.bin import utils 8 from autotest_lib.client.common_lib import error 9 from autotest_lib.client.cros.audio import audio_helper 10 from autotest_lib.client.cros.audio import cmd_utils 11 from autotest_lib.client.cros.audio import cras_utils 12 13 14 TEST_DURATION = 1 15 16 class audio_CrasLoopback(audio_helper.cras_rms_test): 17 """Verifies audio playback and capture function.""" 18 version = 1 19 20 @staticmethod 21 def wait_for_active_stream_count(expected_count): 22 utils.poll_for_condition( 23 lambda: cras_utils.get_active_stream_count() == expected_count, 24 exception=error.TestError( 25 'Timeout waiting active stream count to become %d' % 26 expected_count)) 27 28 29 def run_once(self): 30 """Entry point of this test.""" 31 32 # Multitone wav file lasts 10 seconds 33 wav_path = os.path.join(self.bindir, '10SEC.wav') 34 35 noise_file = os.path.join(self.resultsdir, 'cras_noise.wav') 36 recorded_file = os.path.join(self.resultsdir, 'cras_recorded.wav') 37 38 # Record a sample of "silence" to use as a noise profile. 39 cras_utils.capture(noise_file, duration=1) 40 41 self.wait_for_active_stream_count(0) 42 p = cmd_utils.popen(cras_utils.playback_cmd(wav_path)) 43 try: 44 self.wait_for_active_stream_count(1) 45 cras_utils.capture(recorded_file, duration=TEST_DURATION) 46 47 # Make sure the audio is still playing. 48 if p.poll() != None: 49 raise error.TestError('playback stopped') 50 finally: 51 cmd_utils.kill_or_log_returncode(p) 52 53 rms_value = audio_helper.reduce_noise_and_get_rms( 54 recorded_file, noise_file)[0] 55 self.write_perf_keyval({'rms_value': rms_value}) 56 57
