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 67
