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
9namespace media {
10namespace cast {
11namespace test {
12
13SkewedTickClock::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
20base::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
26void 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
33base::TimeTicks SkewedTickClock::NowTicks() {
34  return SkewTicks(clock_->NowTicks());
35}
36
37}  // namespace test
38}  // namespace cast
39}  // namespace media
40