MDHD.java

/*
 * Flazr <http://flazr.com> Copyright (C) 2009  Peter Thomas.
 *
 * This file is part of Flazr.
 *
 * Flazr 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.
 *
 * Flazr 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 Flazr.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.flazr.io.f4v.box;

import com.flazr.io.f4v.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.flazr.util.Utils;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;

public class MDHD implements Payload {

    private static final Logger logger = LoggerFactory.getLogger(MDHD.class);

    private byte version;
    private byte[] flags;
    private long creationTime;
    private long modificationTime;
    private int timeScale;
    private long duration;
    private byte pad;
    private byte language;
    private short reserved;

    public MDHD(ChannelBuffer in) {
        read(in);
    }

    public int getTimeScale() {
        return timeScale;
    }

    public long getDuration() {
        return duration;
    }

    @Override
    public void read(ChannelBuffer in) {
        version = in.readByte();
        logger.debug("version: {}", Utils.toHex(version));
        flags = new byte[3];
        in.readBytes(flags);
        if (version == 0x00) {
            creationTime = in.readInt();
            modificationTime = in.readInt();
        } else {
            creationTime = in.readLong();
            modificationTime = in.readLong();
        }
        timeScale = in.readInt();
        if (version == 0x00) {
            duration = in.readInt();
        } else {
            duration = in.readLong();
        }
        logger.debug("creationTime {} modificationTime {} timeScale {} duration {}",
                new Object[]{creationTime, modificationTime, timeScale, duration});
        pad = in.readByte();
        language = in.readByte(); // TODO convert to ISO codes ?
        reserved = in.readShort();
    }

    @Override
    public ChannelBuffer write() {
        ChannelBuffer out = ChannelBuffers.dynamicBuffer();
        out.writeByte(version);
        out.writeBytes(new byte[3]); // flags
        if (version == 0x00) {
            out.writeInt((int) creationTime);
            out.writeInt((int) modificationTime);
        } else {
            out.writeLong(creationTime);
            out.writeLong(modificationTime);
        }
        out.writeInt(timeScale);
        if (version == 0x00) {
            out.writeInt((int) duration);
        } else {
            out.writeLong(duration);
        }
        out.writeByte(pad);
        out.writeByte(language);
        out.writeShort(reserved);
        return out;
    }
    
}