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.googlecode.mp4parser.AbstractContainerBox; 20 21 /** 22 * The sample table contains all the time and data indexing of the media samples in a track. Using the tables 23 * here, it is possible to locate samples in time, determine their type (e.g. I-frame or not), and determine their 24 * size, container, and offset into that container. <br> 25 * If the track that contains the Sample Table Box references no data, then the Sample Table Box does not need 26 * to contain any sub-boxes (this is not a very useful media track). <br> 27 * If the track that the Sample Table Box is contained in does reference data, then the following sub-boxes are 28 * required: Sample Description, Sample Size, Sample To Chunk, and Chunk Offset. Further, the Sample 29 * Description Box shall contain at least one entry. A Sample Description Box is required because it contains the 30 * data reference index field which indicates which Data Reference Box to use to retrieve the media samples. 31 * Without the Sample Description, it is not possible to determine where the media samples are stored. The Sync 32 * Sample Box is optional. If the Sync Sample Box is not present, all samples are sync samples.<br> 33 * Annex A provides a narrative description of random access using the structures defined in the Sample Table 34 * Box. 35 */ 36 public class SampleTableBox extends AbstractContainerBox { 37 public static final String TYPE = "stbl"; 38 39 public SampleTableBox() { 40 super(TYPE); 41 } 42 43 public SampleDescriptionBox getSampleDescriptionBox() { 44 for (Box box : boxes) { 45 if (box instanceof SampleDescriptionBox) { 46 return (SampleDescriptionBox) box; 47 } 48 } 49 return null; 50 } 51 52 public SampleSizeBox getSampleSizeBox() { 53 for (Box box : boxes) { 54 if (box instanceof SampleSizeBox) { 55 return (SampleSizeBox) box; 56 } 57 } 58 return null; 59 } 60 61 public SampleToChunkBox getSampleToChunkBox() { 62 for (Box box : boxes) { 63 if (box instanceof SampleToChunkBox) { 64 return (SampleToChunkBox) box; 65 } 66 } 67 return null; 68 } 69 70 public ChunkOffsetBox getChunkOffsetBox() { 71 for (Box box : boxes) { 72 if (box instanceof ChunkOffsetBox) { 73 return (ChunkOffsetBox) box; 74 } 75 } 76 return null; 77 } 78 79 public void setChunkOffsetBox(ChunkOffsetBox b) { 80 for (int i = 0; i < boxes.size(); i++) { 81 Box box = boxes.get(i); 82 if (box instanceof ChunkOffsetBox) { 83 boxes.set(i, b); 84 } 85 } 86 } 87 88 public TimeToSampleBox getTimeToSampleBox() { 89 for (Box box : boxes) { 90 if (box instanceof TimeToSampleBox) { 91 return (TimeToSampleBox) box; 92 } 93 } 94 return null; 95 } 96 97 public SyncSampleBox getSyncSampleBox() { 98 for (Box box : boxes) { 99 if (box instanceof SyncSampleBox) { 100 return (SyncSampleBox) box; 101 } 102 } 103 return null; 104 } 105 106 public CompositionTimeToSample getCompositionTimeToSample() { 107 for (Box box : boxes) { 108 if (box instanceof CompositionTimeToSample) { 109 return (CompositionTimeToSample) box; 110 } 111 } 112 return null; 113 } 114 115 public SampleDependencyTypeBox getSampleDependencyTypeBox() { 116 for (Box box : boxes) { 117 if (box instanceof SampleDependencyTypeBox) { 118 return (SampleDependencyTypeBox) box; 119 } 120 } 121 return null; 122 } 123 124 } 125
