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      1 /*
      2  * Copyright 2008 CoreMedia AG, Hamburg
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the License);
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an AS IS BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.coremedia.iso.boxes;
     18 
     19 import com.coremedia.iso.IsoTypeReader;
     20 import com.coremedia.iso.IsoTypeWriter;
     21 import com.googlecode.mp4parser.AbstractContainerBox;
     22 import com.googlecode.mp4parser.util.ByteBufferByteChannel;
     23 
     24 import java.io.IOException;
     25 import java.nio.ByteBuffer;
     26 
     27 
     28 /**
     29  * A common base structure to contain general metadata. See ISO/IEC 14496-12 Ch. 8.44.1.
     30  */
     31 public class MetaBox extends AbstractContainerBox {
     32     private int version = 0;
     33     private int flags = 0;
     34 
     35     public static final String TYPE = "meta";
     36 
     37     public MetaBox() {
     38         super(TYPE);
     39     }
     40 
     41     @Override
     42     public long getContentSize() {
     43         if (isMp4Box()) {
     44             // it's a fullbox
     45             return 4 + super.getContentSize();
     46         } else {
     47             // it's an apple metabox
     48             return super.getContentSize();
     49         }
     50     }
     51 
     52     @Override
     53     public long getNumOfBytesToFirstChild() {
     54         if (isMp4Box()) {
     55             // it's a fullbox
     56             return 12;
     57         } else {
     58             // it's an apple metabox
     59             return 8;
     60         }
     61     }
     62 
     63     @Override
     64     public void _parseDetails(ByteBuffer content) {
     65         int pos = content.position();
     66         content.get(new byte[4]);
     67         String isHdlr = IsoTypeReader.read4cc(content);
     68         if ("hdlr".equals(isHdlr)) {
     69             //  this is apple bullshit - it's NO FULLBOX
     70             content.position(pos);
     71             version = -1;
     72             flags = -1;
     73         } else {
     74             content.position(pos);
     75             version = IsoTypeReader.readUInt8(content);
     76             flags = IsoTypeReader.readUInt24(content);
     77         }
     78         while (content.remaining() >= 8) {
     79             try {
     80                 boxes.add(boxParser.parseBox(new ByteBufferByteChannel(content), this));
     81             } catch (IOException e) {
     82                 throw new RuntimeException("Sebastian needs to fix 7518765283");
     83             }
     84         }
     85         if (content.remaining() > 0) {
     86             throw new RuntimeException("Sebastian needs to fix it 90732r26537");
     87         }
     88     }
     89 
     90     @Override
     91     protected void getContent(ByteBuffer byteBuffer) {
     92         if (isMp4Box()) {
     93             IsoTypeWriter.writeUInt8(byteBuffer, version);
     94             IsoTypeWriter.writeUInt24(byteBuffer, flags);
     95         }
     96         writeChildBoxes(byteBuffer);
     97     }
     98 
     99 
    100     public boolean isMp4Box() {
    101         return version != -1 && flags != -1;
    102     }
    103 
    104     public void setMp4Box(boolean mp4) {
    105         if (mp4) {
    106             version = 0;
    107             flags = 0;
    108         } else {
    109             version = -1;
    110             flags = -1;
    111         }
    112     }
    113 }
    114