video_detector.cc

// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "power_manager/video_detector.h"

#include "base/logging.h"
#include "base/time.h"
#include "power_manager/util.h"

namespace power_manager {

VideoDetector::VideoDetector() {}

void VideoDetector::Init() {}

bool VideoDetector::GetActivity(int64 activity_threshold_ms,
                                int64* time_since_activity_ms,
                                bool* is_active) {
  CHECK(NULL != is_active);
  if (last_video_time_.is_null()) {
    // This is not an error condition.  It just means there has been no video
    // activity information passed from Chrome.
    LOG(INFO) << "Video activity not found, probably because "
              << "no video activity has been detected yet.";
    *is_active = false;
    return true;
  }
  *time_since_activity_ms =
      (base::TimeTicks::Now() - last_video_time_).InMilliseconds();
  if (*time_since_activity_ms >= 0)  {
    *is_active = *time_since_activity_ms < activity_threshold_ms;
    LOG(INFO) << "Video activity " << (*is_active ? "found." : "not found.")
              << " Last timestamp: " << *time_since_activity_ms << "ms ago.";
  } else {
    *is_active = false;
    // This should not happen due to clock jumps since we are using TimeTicks.
    LOG(WARNING) << "Last video time is ahead of current time.";
  }
  return true;
}

void VideoDetector::HandleActivity(const base::TimeTicks& last_activity_time) {
  last_video_time_ = last_activity_time;
}

}  // namespace power_manager