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// 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/wall_clock_time_source.h"
#include "base/logging.h"
#include "base/time/default_tick_clock.h"
namespace media {
WallClockTimeSource::WallClockTimeSource()
: tick_clock_(new base::DefaultTickClock()),
ticking_(false),
playback_rate_(1.0f) {
}
WallClockTimeSource::~WallClockTimeSource() {
}
void WallClockTimeSource::StartTicking() {
DCHECK(!ticking_);
ticking_ = true;
reference_wall_ticks_ = tick_clock_->NowTicks();
}
void WallClockTimeSource::StopTicking() {
DCHECK(ticking_);
base_time_ = CurrentMediaTime();
ticking_ = false;
reference_wall_ticks_ = tick_clock_->NowTicks();
}
void WallClockTimeSource::SetPlaybackRate(float playback_rate) {
// Estimate current media time using old rate to use as a new base time for
// the new rate.
if (ticking_) {
base_time_ = CurrentMediaTime();
reference_wall_ticks_ = tick_clock_->NowTicks();
}
playback_rate_ = playback_rate;
}
void WallClockTimeSource::SetMediaTime(base::TimeDelta time) {
CHECK(!ticking_);
base_time_ = time;
}
base::TimeDelta WallClockTimeSource::CurrentMediaTime() {
if (!ticking_)
return base_time_;
base::TimeTicks now = tick_clock_->NowTicks();
return base_time_ +
base::TimeDelta::FromMicroseconds(
(now - reference_wall_ticks_).InMicroseconds() * playback_rate_);
}
void WallClockTimeSource::SetTickClockForTesting(
scoped_ptr<base::TickClock> tick_clock) {
tick_clock_.swap(tick_clock);
}
} // namespace media
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