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.AbstractFullBox;
22 
23 import java.nio.ByteBuffer;
24 
25 import static com.googlecode.mp4parser.util.CastUtils.l2i;
26 
27 /**
28  * This box provides a compact marking of the random access points withinthe stream. The table is arranged in
29  * strictly decreasinf order of sample number. Defined in ISO/IEC 14496-12.
30  */
31 public class SyncSampleBox extends AbstractFullBox {
32     public static final String TYPE = "stss";
33 
34     private long[] sampleNumber;
35 
SyncSampleBox()36     public SyncSampleBox() {
37         super(TYPE);
38     }
39 
40     /**
41      * Gives the numbers of the samples that are random access points in the stream.
42      *
43      * @return random access sample numbers.
44      */
getSampleNumber()45     public long[] getSampleNumber() {
46         return sampleNumber;
47     }
48 
getContentSize()49     protected long getContentSize() {
50         return sampleNumber.length * 4 + 8;
51     }
52 
53     @Override
_parseDetails(ByteBuffer content)54     public void _parseDetails(ByteBuffer content) {
55         parseVersionAndFlags(content);
56         int entryCount = l2i(IsoTypeReader.readUInt32(content));
57 
58         sampleNumber = new long[entryCount];
59         for (int i = 0; i < entryCount; i++) {
60             sampleNumber[i] = IsoTypeReader.readUInt32(content);
61         }
62     }
63 
64     @Override
getContent(ByteBuffer byteBuffer)65     protected void getContent(ByteBuffer byteBuffer) {
66         writeVersionAndFlags(byteBuffer);
67 
68         IsoTypeWriter.writeUInt32(byteBuffer, sampleNumber.length);
69 
70         for (long aSampleNumber : sampleNumber) {
71             IsoTypeWriter.writeUInt32(byteBuffer, aSampleNumber);
72         }
73 
74     }
75 
toString()76     public String toString() {
77         return "SyncSampleBox[entryCount=" + sampleNumber.length + "]";
78     }
79 
setSampleNumber(long[] sampleNumber)80     public void setSampleNumber(long[] sampleNumber) {
81         this.sampleNumber = sampleNumber;
82     }
83 }
84