Convert media constants to constexpr.

media/base/time_delta_interpolator.cc

 // Copyright 2014 The Chromium 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 "media/base/time_delta_interpolator.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/time/tick_clock.h"
 #include "media/base/timestamp_constants.h"
 
 namespace media {
 
 TimeDeltaInterpolator::TimeDeltaInterpolator(base::TickClock* tick_clock)
     : tick_clock_(tick_clock),
       interpolating_(false),
-      upper_bound_(kNoTimestamp()),
+      upper_bound_(kNoTimestamp),
       playback_rate_(1.0) {
   DCHECK(tick_clock_);
 }
 
 TimeDeltaInterpolator::~TimeDeltaInterpolator() {
 }
 
 base::TimeDelta TimeDeltaInterpolator::StartInterpolating() {
   DCHECK(!interpolating_);
   reference_ = tick_clock_->NowTicks();
@@ skipping 10 matching lines @@
 
 void TimeDeltaInterpolator::SetPlaybackRate(double playback_rate) {
   lower_bound_ = GetInterpolatedTime();
   reference_ = tick_clock_->NowTicks();
   playback_rate_ = playback_rate;
 }
 
 void TimeDeltaInterpolator::SetBounds(base::TimeDelta lower_bound,
                                       base::TimeDelta upper_bound) {
   DCHECK(lower_bound <= upper_bound);
-  DCHECK(lower_bound != kNoTimestamp());
+  DCHECK(lower_bound != kNoTimestamp);
 
   lower_bound_ = std::max(base::TimeDelta(), lower_bound);
   upper_bound_ = std::max(base::TimeDelta(), upper_bound);
   reference_ = tick_clock_->NowTicks();
 }
 
 void TimeDeltaInterpolator::SetUpperBound(base::TimeDelta upper_bound) {
-  DCHECK(upper_bound != kNoTimestamp());
+  DCHECK(upper_bound != kNoTimestamp);
 
   lower_bound_ = GetInterpolatedTime();
   reference_ = tick_clock_->NowTicks();
   upper_bound_ = upper_bound;
 }
 
 base::TimeDelta TimeDeltaInterpolator::GetInterpolatedTime() {
   if (!interpolating_)
     return lower_bound_;
 
   int64_t now_us = (tick_clock_->NowTicks() - reference_).InMicroseconds();
   now_us = static_cast<int64_t>(now_us * playback_rate_);
   base::TimeDelta interpolated_time =
       lower_bound_ + base::TimeDelta::FromMicroseconds(now_us);
 
-  if (upper_bound_ == kNoTimestamp())
+  if (upper_bound_ == kNoTimestamp)
     return interpolated_time;
 
   return std::min(interpolated_time, upper_bound_);
 }
 
 }  // namespace media