content/renderer/media/render_media_log.cc

   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
   5 #include "content/renderer/media/render_media_log.h"
   6
   7 #include "base/bind.h"
   8 #include "base/logging.h"
   9 #include "base/message_loop/message_loop_proxy.h"
  10 #include "content/common/view_messages.h"
  11 #include "content/public/renderer/render_thread.h"
  12
  13 namespace content {
  14
  15 RenderMediaLog::RenderMediaLog()
  16     : render_loop_(base::MessageLoopProxy::current()),
  17       tick_clock_(new base::DefaultTickClock()),
  18       last_ipc_send_time_(tick_clock_->NowTicks()) {
  19   DCHECK(RenderThread::Get()) <<
  20       "RenderMediaLog must be constructed on the render thread";
  21 }
  22
  23 void RenderMediaLog::AddEvent(scoped_ptr<media::MediaLogEvent> event) {
  24   if (!RenderThread::Get()) {
  25     render_loop_->PostTask(FROM_HERE, base::Bind(
  26         &RenderMediaLog::AddEvent, this, base::Passed(&event)));
  27     return;
  28   }
  29
  30   // Keep track of the latest buffered extents properties to avoid sending
  31   // thousands of events over IPC. See http://crbug.com/352585 for details.
  32   //
  33   // TODO(scherkus): We should overhaul MediaLog entirely to have clearer
  34   // separation of properties vs. events.
  35   if (event->type == media::MediaLogEvent::BUFFERED_EXTENTS_CHANGED)
  36     last_buffered_extents_changed_event_.swap(event);
  37   else
  38     queued_media_events_.push_back(*event);
  39
  40   // Limit the send rate of high frequency events.
  41   base::TimeTicks curr_time = tick_clock_->NowTicks();
  42   if ((curr_time - last_ipc_send_time_) < base::TimeDelta::FromSeconds(1))
  43     return;
  44   last_ipc_send_time_ = curr_time;
  45
  46   if (last_buffered_extents_changed_event_) {
  47     queued_media_events_.push_back(*last_buffered_extents_changed_event_);
  48     last_buffered_extents_changed_event_.reset();
  49   }
  50
  51   DVLOG(1) << "media log events array size " << queued_media_events_.size();
  52
  53   RenderThread::Get()->Send(
  54       new ViewHostMsg_MediaLogEvents(queued_media_events_));
  55   queued_media_events_.clear();
  56 }
  57
  58 RenderMediaLog::~RenderMediaLog() {}
  59
  60 void RenderMediaLog::SetTickClockForTesting(
  61     scoped_ptr<base::TickClock> tick_clock) {
  62   tick_clock_.swap(tick_clock);
  63   last_ipc_send_time_ = tick_clock_->NowTicks();
  64 }
  65
  66 }  // namespace content