org.libav.CopyTimestampGenerator Maven / Gradle / Ivy
/*
* Copyright (C) 2012 Ondrej Perutka
*
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, either
* version 3 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* .
*/
package org.libav;
/**
* Copy timestamp generator. New timestamp is the input timestamp - offset.
* The first input timestamp is set as offset after the new object creation
* or reset call.
*
* @author Ondrej Perutka
*/
public class CopyTimestampGenerator implements ITimestampGenerator {
private boolean inputAsOffset;
private long offset;
private long lastTimestamp;
public CopyTimestampGenerator() {
inputAsOffset = true;
offset = 0;
lastTimestamp = -1;
}
@Override
public long nextFrame(long inputTimestamp) {
if (inputAsOffset) {
offset = inputTimestamp;
lastTimestamp = -1;
inputAsOffset = false;
}
if ((inputTimestamp - offset) <= lastTimestamp)
return -1;
lastTimestamp = inputTimestamp - offset;
return lastTimestamp;
}
@Override
public long getLastTimestamp() {
return lastTimestamp;
}
@Override
public void setInputOffset(long offset) {
this.offset = offset;
lastTimestamp = -1;
}
@Override
public long getInputOffset() {
return offset;
}
@Override
public void reset() {
inputAsOffset = true;
}
}