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 20 import com.coremedia.iso.IsoTypeWriter; 21 import com.googlecode.mp4parser.FullContainerBox; 22 23 import java.nio.ByteBuffer; 24 25 /** 26 * The data reference object contains a table of data references (normally URLs) that declare the location(s) of 27 * the media data used within the presentation. The data reference index in the sample description ties entries in 28 * this table to the samples in the track. A track may be split over several sources in this way. 29 * If the flag is set indicating that the data is in the same file as this box, then no string (not even an empty one) 30 * shall be supplied in the entry field. 31 * The DataEntryBox within the DataReferenceBox shall be either a DataEntryUrnBox or a DataEntryUrlBox. 32 * 33 * @see com.coremedia.iso.boxes.DataEntryUrlBox 34 * @see com.coremedia.iso.boxes.DataEntryUrnBox 35 */ 36 public class DataReferenceBox extends FullContainerBox { 37 38 public static final String TYPE = "dref"; 39 40 public DataReferenceBox() { 41 super(TYPE); 42 43 } 44 45 @Override 46 protected long getContentSize() { 47 return super.getContentSize() + 4; 48 } 49 50 @Override 51 public void _parseDetails(ByteBuffer content) { 52 parseVersionAndFlags(content); 53 content.get(new byte[4]); // basically a skip of 4 bytes signaling the number of child boxes 54 parseChildBoxes(content); 55 } 56 57 58 @Override 59 protected void getContent(ByteBuffer byteBuffer) { 60 writeVersionAndFlags(byteBuffer); 61 IsoTypeWriter.writeUInt32(byteBuffer, getBoxes().size()); 62 writeChildBoxes(byteBuffer); 63 } 64 65 } 66
