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Freedom for Media in Java

There is a newer version: 1.0.2-jitsi

package net.sf.fmj.media.util;

import javax.media.*;
import javax.media.format.*;

/**
 * A utility class to keep track of the passage of time as data buffers are
 * being processed.
 */
public class ElapseTime
{
    /**
     * Convert audio: length (bytes) to duration (nanoseconds).
     */
    static public long audioLenToTime(long len, AudioFormat af)
    {
        return af.computeDuration(len);
    }

    /**
     * Convert audio: duration (nanoseconds) to length (bytes).
     */
    static public long audioTimeToLen(long duration, AudioFormat af)
    {
        long units, bytesPerSec;

        if (af.getSampleSizeInBits() > 0)
        {
            units = (af.getSampleSizeInBits() * af.getChannels());
            bytesPerSec = (long) ((units * af.getSampleRate()) / 8);
        } else if (af.getFrameSizeInBits() != Format.NOT_SPECIFIED
                && af.getFrameRate() != Format.NOT_SPECIFIED)
        {
            units = af.getFrameSizeInBits();
            bytesPerSec = (long) ((units * af.getFrameRate()) / 8);
        } else
        {
            units = bytesPerSec = 0;
        }

        // The length returned needs to be in multiples of audio sample
        // chunk unit.
        return (bytesPerSec == 0 ? 0 : ((duration * bytesPerSec) / 1000000000)
                / units * units);
    }

    public long value = 0;

    public long getValue()
    {
        return value;
    }

    public void setValue(long t)
    {
        value = t;
    }

    public boolean update(int len, long ts, Format f)
    {
        if (f instanceof AudioFormat)
        {
            long t;
            if ((t = ((AudioFormat) f).computeDuration(len)) > 0)
                value += t;
            else if (ts > 0)
                value = ts;
            else
                return false;
        } else if (ts > 0)
            value = ts;
        else
            return false;

        return true;
    }
}