1# Copyright (c) 2012 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
5import logging
6import os
7
8from autotest_lib.client.bin import utils
9from autotest_lib.client.common_lib import error
10from autotest_lib.client.cros.audio import audio_helper
11from autotest_lib.client.cros.audio import cmd_utils
12from autotest_lib.client.cros.audio import cras_utils
13
14TEST_DURATION = 15
15
16class audio_YoutubePlayback(audio_helper.chrome_rms_test):
17    """Verifies if youtube playback can be captured."""
18    version = 1
19
20    def play_video(self, tab, video_url):
21        """Plays a Youtube video to record audio samples.
22
23           @param tab: the tab to load and play the video.
24        """
25        tab.Navigate(video_url)
26
27        def player_is_ready():
28            """Returns whether the player is ready."""
29            return tab.EvaluateJavaScript('typeof player != "undefined"')
30
31        utils.poll_for_condition(
32            condition=player_is_ready,
33            exception=error.TestError('Failed to load the Youtube player'))
34
35        tab.ExecuteJavaScript('player.playVideo()')
36
37        # Make sure the video is playing
38        def get_current_time():
39            """Returns current time."""
40            return tab.EvaluateJavaScript('player.getCurrentTime()')
41
42        old_time = get_current_time()
43        utils.poll_for_condition(
44            condition=lambda: get_current_time() > old_time,
45            exception=error.TestError('Video is not played until timeout'))
46
47
48    def run_once(self):
49        """Entry point of this test."""
50        self.chrome.browser.platform.SetHTTPServerDirectories(self.bindir)
51
52        video_url = self.chrome.browser.platform.http_server.UrlOf(
53                os.path.join(self.bindir, 'youtube.html'))
54        logging.info('Playing back youtube media file %s.', video_url)
55        noise_file = os.path.join(self.resultsdir, "noise.wav")
56        recorded_file = os.path.join(self.resultsdir, "recorded.wav")
57        loopback_file = os.path.join(self.resultsdir, "loopback.wav")
58
59        # Record a sample of "silence" to use as a noise profile.
60        cras_utils.capture(noise_file, duration=3)
61
62        # Play a video and record the audio output
63        self.play_video(self.chrome.browser.tabs[0], video_url)
64
65        p1 = cmd_utils.popen(cras_utils.capture_cmd(
66                recorded_file, duration=TEST_DURATION))
67        p2 = cmd_utils.popen(cras_utils.loopback_cmd(
68                loopback_file, duration=TEST_DURATION))
69
70        cmd_utils.wait_and_check_returncode(p1, p2)
71
72        # See if we recorded something
73        loopback_stats = [audio_helper.get_channel_sox_stat(
74                loopback_file, i) for i in (1, 2)]
75        logging.info('loopback stats: %s', [str(s) for s in loopback_stats])
76        rms_value = audio_helper.reduce_noise_and_get_rms(
77            recorded_file, noise_file)[0]
78
79        self.write_perf_keyval({'rms_value': rms_value})
80