Home | History | Annotate | Download | only in samplegrouping 
      1 /*
      2  * Copyright 2012 castLabs, Berlin
      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.googlecode.mp4parser.boxes.mp4.samplegrouping;
     18 
     19 import java.nio.ByteBuffer;
     20 
     21 /**
     22  * roll_distance is a signed integer that gives the number of samples that must be decoded in order for
     23  * a sample to be decoded correctly. A positive value indicates the number of samples after the sample
     24  * that is a group member that must be decoded such that at the last of these recovery is complete, i.e.
     25  * the last sample is correct. A negative value indicates the number of samples before the sample that is
     26  * a group member that must be decoded in order for recovery to be complete at the marked sample.
     27  * The value zero must not be used; the sync sample table documents random access points for which
     28  * no recovery roll is needed.
     29  */
     30 public class RollRecoveryEntry extends GroupEntry {
     31     public static final String TYPE = "roll";
     32     private short rollDistance;
     33 
     34     public short getRollDistance() {
     35         return rollDistance;
     36     }
     37 
     38     public void setRollDistance(short rollDistance) {
     39         this.rollDistance = rollDistance;
     40     }
     41 
     42     @Override
     43     public void parse(ByteBuffer byteBuffer) {
     44         rollDistance = byteBuffer.getShort();
     45     }
     46 
     47     @Override
     48     public ByteBuffer get() {
     49         ByteBuffer content = ByteBuffer.allocate(2);
     50         content.putShort(rollDistance);
     51         content.rewind();
     52         return content;
     53     }
     54 
     55     @Override
     56     public boolean equals(Object o) {
     57         if (this == o) {
     58             return true;
     59         }
     60         if (o == null || getClass() != o.getClass()) {
     61             return false;
     62         }
     63 
     64         RollRecoveryEntry entry = (RollRecoveryEntry) o;
     65 
     66         if (rollDistance != entry.rollDistance) {
     67             return false;
     68         }
     69 
     70         return true;
     71     }
     72 
     73     @Override
     74     public int hashCode() {
     75         return (int) rollDistance;
     76     }
     77 }
     78