1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
  100
  101
  102
  103
  104
  105
  106
  107
  108
  109
  110
  111
  112
  113
  114
  115
  116
  117
  118
  119
  120
  121
  122
  123
  124
  125
  126
  127
  128
  129
  130
  131
  132
  133
  134
  135
  136
  137
  138
  139
  140
  141


media / mojo / services / playback_events_recorder.cc [blame]

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "media/mojo/services/playback_events_recorder.h"

#include "base/metrics/user_metrics.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"

namespace media {

namespace {

void RecordEventWithValueAt(const char* name,
                            int64_t value,
                            base::TimeTicks time) {
  base::RecordComputedActionAt(base::StrCat({"WebEngine.Media.", name, ":",
                                             base::NumberToString(value)}),
                               time);
}

void RecordEventWithValue(const char* name, int64_t value) {
  RecordEventWithValueAt(name, value, base::TimeTicks::Now());
}

constexpr base::TimeDelta kBitrateReportPeriod = base::Seconds(5);

}  // namespace

PlaybackEventsRecorder::BitrateEstimator::BitrateEstimator() {}
PlaybackEventsRecorder::BitrateEstimator::~BitrateEstimator() {}

void PlaybackEventsRecorder::BitrateEstimator::Update(
    const PipelineStatistics& stats) {
  base::TimeTicks now = base::TimeTicks::Now();

  // The code below trusts that |stats| are valid even though they came from an
  // untrusted process. That's accepable because the stats are used only to
  // record metrics.
  if (last_stats_) {
    time_elapsed_ += now - last_stats_time_;
    audio_bytes_ +=
        stats.audio_bytes_decoded - last_stats_->audio_bytes_decoded;
    video_bytes_ +=
        stats.video_bytes_decoded - last_stats_->video_bytes_decoded;
    if (time_elapsed_ >= kBitrateReportPeriod) {
      size_t audio_bitrate_kbps =
          8 * audio_bytes_ / time_elapsed_.InMilliseconds();
      RecordEventWithValueAt("AudioBitrate", audio_bitrate_kbps, now);

      size_t video_bitrate_kbps =
          8 * video_bytes_ / time_elapsed_.InMilliseconds();
      RecordEventWithValueAt("VideoBitrate", video_bitrate_kbps, now);

      time_elapsed_ = base::TimeDelta();
      audio_bytes_ = 0;
      video_bytes_ = 0;
    }
  }

  last_stats_ = stats;
  last_stats_time_ = now;
}

void PlaybackEventsRecorder::BitrateEstimator::OnPause() {
  last_stats_ = {};
}

// static
void PlaybackEventsRecorder::Create(
    mojo::PendingReceiver<mojom::PlaybackEventsRecorder> receiver) {
  mojo::MakeSelfOwnedReceiver(std::make_unique<PlaybackEventsRecorder>(),
                              std::move(receiver));
}

PlaybackEventsRecorder::PlaybackEventsRecorder() = default;
PlaybackEventsRecorder::~PlaybackEventsRecorder() = default;

void PlaybackEventsRecorder::OnPlaying() {
  base::RecordComputedAction("WebEngine.Media.Playing");
}

void PlaybackEventsRecorder::OnPaused() {
  base::RecordComputedAction("WebEngine.Media.Pause");
  bitrate_estimator_.OnPause();
}

void PlaybackEventsRecorder::OnSeeking() {
  buffering_state_ = BufferingState::kInitialBuffering;
}

void PlaybackEventsRecorder::OnEnded() {
  base::RecordComputedAction("WebEngine.Media.Ended");
}

void PlaybackEventsRecorder::OnBuffering() {
  DCHECK(buffering_state_ == BufferingState::kBuffered);

  buffering_start_time_ = base::TimeTicks::Now();
  buffering_state_ = BufferingState::kBuffering;

  bitrate_estimator_.OnPause();
}

void PlaybackEventsRecorder::OnBufferingComplete() {
  auto now = base::TimeTicks::Now();

  if (buffering_state_ == BufferingState::kBuffering) {
    base::TimeDelta time_between_buffering =
        buffering_start_time_ - last_buffering_end_time_;
    RecordEventWithValueAt("PlayTimeBeforeAutoPause",
                           time_between_buffering.InMilliseconds(), now);

    base::TimeDelta buffering_user_time = now - buffering_start_time_;
    RecordEventWithValueAt("AutoPauseTime",
                           buffering_user_time.InMilliseconds(), now);
  }

  buffering_state_ = BufferingState::kBuffered;
  last_buffering_end_time_ = now;
}

void PlaybackEventsRecorder::OnError(const PipelineStatus& status) {
  RecordEventWithValue("Error", status.code());
}

void PlaybackEventsRecorder::OnNaturalSizeChanged(const gfx::Size& size) {
  int encoded_video_resolution = (size.width() << 16) | size.height();
  base::RecordComputedAction(base::StringPrintf(
      "WebEngine.Media.VideoResolution:%d", encoded_video_resolution));
}

void PlaybackEventsRecorder::OnPipelineStatistics(
    const PipelineStatistics& stats) {
  bitrate_estimator_.Update(stats);
}

}  // namespace media