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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.tv.tuner.exoplayer.ac3;
import com.android.tv.common.SoftPreconditions;
import android.os.SystemClock;
/**
* Copy of {@link com.google.android.exoplayer.MediaClock}.
* <p>
* A simple clock for tracking the progression of media time. The clock can be started, stopped and
* its time can be set and retrieved. When started, this clock is based on
* {@link SystemClock#elapsedRealtime()}.
*/
/* package */ class AudioClock {
private boolean mStarted;
/**
* The media time when the clock was last set or stopped.
*/
private long mPositionUs;
/**
* The difference between {@link SystemClock#elapsedRealtime()} and {@link #mPositionUs}
* when the clock was last set or mStarted.
*/
private long mDeltaUs;
private float mPlaybackSpeed = 1.0f;
private long mDeltaUpdatedTimeUs;
/**
* Starts the clock. Does nothing if the clock is already started.
*/
public void start() {
if (!mStarted) {
mStarted = true;
mDeltaUs = elapsedRealtimeMinus(mPositionUs);
mDeltaUpdatedTimeUs = SystemClock.elapsedRealtime() * 1000;
}
}
/**
* Stops the clock. Does nothing if the clock is already stopped.
*/
public void stop() {
if (mStarted) {
mPositionUs = elapsedRealtimeMinus(mDeltaUs);
mStarted = false;
}
}
/**
* @param timeUs The position to set in microseconds.
*/
public void setPositionUs(long timeUs) {
this.mPositionUs = timeUs;
mDeltaUs = elapsedRealtimeMinus(timeUs);
mDeltaUpdatedTimeUs = SystemClock.elapsedRealtime() * 1000;
}
/**
* @return The current position in microseconds.
*/
public long getPositionUs() {
if (!mStarted) {
return mPositionUs;
}
if (mPlaybackSpeed != 1.0f) {
long elapsedTimeFromPlaybackSpeedChanged = SystemClock.elapsedRealtime() * 1000
- mDeltaUpdatedTimeUs;
return elapsedRealtimeMinus(mDeltaUs)
+ (long) ((mPlaybackSpeed - 1.0f) * elapsedTimeFromPlaybackSpeedChanged);
} else {
return elapsedRealtimeMinus(mDeltaUs);
}
}
/**
* Sets playback speed. {@code speed} should be positive.
*/
public void setPlaybackSpeed(float speed) {
SoftPreconditions.checkState(speed > 0);
mDeltaUs = elapsedRealtimeMinus(getPositionUs());
mDeltaUpdatedTimeUs = SystemClock.elapsedRealtime() * 1000;
mPlaybackSpeed = speed;
}
private long elapsedRealtimeMinus(long toSubtractUs) {
return SystemClock.elapsedRealtime() * 1000 - toSubtractUs;
}
}
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