media/cast/test/skewed_tick_clock.cc

   1 // Copyright 2014 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 "media/cast/test/skewed_tick_clock.h"
   6
   7 #include "base/time/time.h"
   8
   9 namespace media {
  10 namespace cast {
  11 namespace test {
  12
  13 SkewedTickClock::SkewedTickClock(base::TickClock* clock)
  14     : clock_(clock),
  15       skew_(1.0),
  16       last_skew_set_time_(clock_->NowTicks()),
  17       skew_clock_at_last_set_(last_skew_set_time_) {
  18 }
  19
  20 base::TimeTicks SkewedTickClock::SkewTicks(base::TimeTicks now) {
  21   return base::TimeDelta::FromMicroseconds(
  22       (now - last_skew_set_time_).InMicroseconds() * skew_) +
  23       skew_clock_at_last_set_;
  24 }
  25
  26 void SkewedTickClock::SetSkew(double skew, base::TimeDelta offset) {
  27   base::TimeTicks now = clock_->NowTicks();
  28   skew_clock_at_last_set_ = SkewTicks(now) + offset;
  29   skew_ = skew;
  30   last_skew_set_time_ = now;
  31 }
  32
  33 base::TimeTicks SkewedTickClock::NowTicks() {
  34   return SkewTicks(clock_->NowTicks());
  35 }
  36
  37 }  // namespace test
  38 }  // namespace cast
  39 }  // namespace media