1 # Copyright (c) 2013 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.
5 """A Telemetry page_action that performs the "play" action on media elements.
7 Media elements can be specified by a selector attribute. If no selector is
8 defined then then the action attempts to play the first video element or audio
9 element on the page. A selector can also be 'all' to play all media elements.
11 Other attributes to use are: wait_for_playing and wait_for_ended, which forces
12 the action to wait until playing and ended events get fired respectively.
15 from telemetry.core import exceptions
16 from telemetry.page.actions import media_action
17 from telemetry.page.actions import page_action
20 class PlayAction(media_action.MediaAction):
21 def __init__(self, attributes=None):
22 super(PlayAction, self).__init__(attributes)
24 def WillRunAction(self, page, tab):
25 """Load the media metrics JS code prior to running the action."""
26 super(PlayAction, self).WillRunAction(page, tab)
27 self.LoadJS(tab, 'play.js')
29 def RunAction(self, page, tab, previous_action):
31 selector = self.selector if hasattr(self, 'selector') else ''
32 tab.ExecuteJavaScript('window.__playMedia("%s");' % selector)
33 timeout = self.wait_timeout if hasattr(self, 'wait_timeout') else 60
34 # Check if we need to wait for 'playing' event to fire.
35 if hasattr(self, 'wait_for_playing') and self.wait_for_playing:
36 self.WaitForEvent(tab, selector, 'playing', timeout)
37 # Check if we need to wait for 'ended' event to fire.
38 if hasattr(self, 'wait_for_ended') and self.wait_for_ended:
39 self.WaitForEvent(tab, selector, 'ended', timeout)
40 except exceptions.EvaluateException:
41 raise page_action.PageActionFailed('Cannot play media element(s) with '
42 'selector = %s.' % selector)