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// Copyright (c) 2012 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/clock.h"
#include "base/logging.h"
#include "media/base/buffers.h"
namespace media {
Clock::Clock(TimeProvider* time_provider)
: time_provider_(time_provider),
playing_(false),
playback_rate_(1.0f) {
}
Clock::~Clock() {}
bool Clock::IsPlaying() const {
return playing_;
}
base::TimeDelta Clock::Play() {
DCHECK(!playing_);
reference_ = GetTimeFromProvider();
playing_ = true;
return media_time_;
}
base::TimeDelta Clock::Pause() {
DCHECK(playing_);
// Save our new accumulated amount of media time.
media_time_ = Elapsed();
playing_ = false;
return media_time_;
}
void Clock::SetPlaybackRate(float playback_rate) {
if (playing_) {
base::Time time = GetTimeFromProvider();
media_time_ = ElapsedViaProvidedTime(time);
reference_ = time;
}
playback_rate_ = playback_rate;
}
void Clock::SetTime(const base::TimeDelta& time) {
if (time == kNoTimestamp) {
NOTREACHED();
return;
}
if (playing_) {
reference_ = GetTimeFromProvider();
}
media_time_ = time;
}
base::TimeDelta Clock::Elapsed() const {
if (!playing_) {
return media_time_;
}
return ElapsedViaProvidedTime(GetTimeFromProvider());
}
base::TimeDelta Clock::ElapsedViaProvidedTime(const base::Time& time) const {
// TODO(scherkus): floating point badness scaling time by playback rate.
int64 now_us = (time - reference_).InMicroseconds();
now_us = static_cast<int64>(now_us * playback_rate_);
return media_time_ + base::TimeDelta::FromMicroseconds(now_us);
}
base::Time Clock::GetTimeFromProvider() const {
if (time_provider_) {
return time_provider_();
}
return base::Time();
}
} // namespace media
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