MetaBox.java

/*  
 * Copyright 2008 CoreMedia AG, Hamburg
 *
 * 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.coremedia.iso.boxes;

import com.coremedia.iso.BoxParser;
import com.coremedia.iso.IsoBufferWrapper;
import com.coremedia.iso.IsoFile;
import com.coremedia.iso.IsoOutputStream;

import java.io.IOException;


/**
 * A common base structure to contain general metadata. See ISO/IEC 14496-12 Ch. 8.44.1.
 */
public class MetaBox extends AbstractContainerBox {
    private int version = 0;
    private int flags = 0;

    public static final String TYPE = "meta";

    public MetaBox() {
        super(IsoFile.fourCCtoBytes(TYPE));
    }

    @Override
    public long getContentSize() {
        if (isMp4Box()) {
            // it's a fullbox
            return 4 + super.getContentSize();
        } else {
            // it's an apple metabox
            return super.getContentSize();
        }
    }

    @Override
    public long getNumOfBytesToFirstChild() {
        if (isMp4Box()) {
            // it's a fullbox
            return 12;
        } else {
            // it's an apple metabox
            return 8;
        }
    }

    @Override
    protected void getContent(IsoOutputStream os) throws IOException {
        if (isMp4Box()) {
            os.writeUInt8(version);
            os.writeUInt24(flags);
        }
        super.getContent(os);    //To change body of overridden methods use File | Settings | File Templates.
    }

    @Override
    public void parse(IsoBufferWrapper in, long size, BoxParser boxParser, Box lastMovieFragmentBox) throws IOException {
        long pos = in.position();
        in.skip(4);
        if ("hdlr".equals(IsoFile.bytesToFourCC(in.read(4)))) {
            //  this is apple bullshit - it's NO FULLBOX
            in.position(pos);
            version = -1;
            flags = -1;
        } else {
            in.position(pos);
            version = in.readUInt8();
            flags = in.readUInt24();
        }
        super.parse(in, size, boxParser, lastMovieFragmentBox);
    }

    public boolean isMp4Box() {
        return version != -1 && flags != -1;
    }

    public void setMp4Box(boolean mp4) {
        if (mp4) {
            version = 0;
            flags = 0;
        } else {
            version = -1;
            flags = -1;
        }
    }
}