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/location.h"
   9 #include "base/logging.h"
  10 #include "base/single_thread_task_runner.h"
  11 #include "base/thread_task_runner_handle.h"
  12 #include "content/common/view_messages.h"
  13 #include "content/public/renderer/render_thread.h"
  14
  15 namespace {
  16
  17 // Print an event to the chromium log.
  18 void Log(media::MediaLogEvent* event) {
  19   if (event->type == media::MediaLogEvent::PIPELINE_ERROR) {
  20     LOG(ERROR) << "MediaEvent: "
  21                << media::MediaLog::MediaEventToLogString(*event);
  22   } else if (event->type != media::MediaLogEvent::BUFFERED_EXTENTS_CHANGED &&
  23              event->type != media::MediaLogEvent::PROPERTY_CHANGE &&
  24              event->type != media::MediaLogEvent::NETWORK_ACTIVITY_SET) {
  25     DVLOG(1) << "MediaEvent: "
  26              << media::MediaLog::MediaEventToLogString(*event);
  27   }
  28 }
  29
  30 }  // namespace
  31
  32 namespace content {
  33
  34 RenderMediaLog::RenderMediaLog()
  35     : task_runner_(base::ThreadTaskRunnerHandle::Get()),
  36       tick_clock_(new base::DefaultTickClock()),
  37       last_ipc_send_time_(tick_clock_->NowTicks()) {
  38   DCHECK(RenderThread::Get())
  39       << "RenderMediaLog must be constructed on the render thread";
  40 }
  41
  42 void RenderMediaLog::AddEvent(scoped_ptr<media::MediaLogEvent> event) {
  43   // Always post to preserve the correct order of events.
  44   // TODO(xhwang): Consider using sorted containers to keep the order and
  45   // avoid extra posting.
  46   task_runner_->PostTask(FROM_HERE,
  47                          base::Bind(&RenderMediaLog::AddEventInternal, this,
  48                                     base::Passed(&event)));
  49 }
  50
  51 void RenderMediaLog::AddEventInternal(scoped_ptr<media::MediaLogEvent> event) {
  52   DCHECK(task_runner_->BelongsToCurrentThread());
  53
  54   Log(event.get());
  55
  56   // If there is an event waiting to be sent, there must be a send task pending.
  57   const bool delayed_ipc_send_pending =
  58       !queued_media_events_.empty() || last_buffered_extents_changed_event_;
  59
  60   // Keep track of the latest buffered extents properties to avoid sending
  61   // thousands of events over IPC. See http://crbug.com/352585 for details.
  62   if (event->type == media::MediaLogEvent::BUFFERED_EXTENTS_CHANGED)
  63     last_buffered_extents_changed_event_.swap(event);
  64   else
  65     queued_media_events_.push_back(*event);
  66
  67   if (delayed_ipc_send_pending)
  68     return;
  69
  70   // Delay until it's been a second since the last ipc message was sent.
  71   base::TimeDelta delay_for_next_ipc_send =
  72       base::TimeDelta::FromSeconds(1) -
  73       (tick_clock_->NowTicks() - last_ipc_send_time_);
  74   if (delay_for_next_ipc_send > base::TimeDelta()) {
  75     task_runner_->PostDelayedTask(
  76         FROM_HERE, base::Bind(&RenderMediaLog::SendQueuedMediaEvents, this),
  77         delay_for_next_ipc_send);
  78     return;
  79   }
  80
  81   // It's been more than a second so send now.
  82   SendQueuedMediaEvents();
  83 }
  84
  85 void RenderMediaLog::SendQueuedMediaEvents() {
  86   DCHECK(task_runner_->BelongsToCurrentThread());
  87
  88   if (last_buffered_extents_changed_event_) {
  89     queued_media_events_.push_back(*last_buffered_extents_changed_event_);
  90     last_buffered_extents_changed_event_.reset();
  91   }
  92
  93   RenderThread::Get()->Send(
  94       new ViewHostMsg_MediaLogEvents(queued_media_events_));
  95   queued_media_events_.clear();
  96   last_ipc_send_time_ = tick_clock_->NowTicks();
  97 }
  98
  99 RenderMediaLog::~RenderMediaLog() {
 100 }
 101
 102 void RenderMediaLog::SetTickClockForTesting(
 103     scoped_ptr<base::TickClock> tick_clock) {
 104   tick_clock_.swap(tick_clock);
 105   last_ipc_send_time_ = tick_clock_->NowTicks();
 106 }
 107
 108 void RenderMediaLog::SetTaskRunnerForTesting(
 109     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
 110   task_runner_ = task_runner;
 111 }
 112
 113 }  // namespace content