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 getRollDistance()34 public short getRollDistance() { 35 return rollDistance; 36 } 37 setRollDistance(short rollDistance)38 public void setRollDistance(short rollDistance) { 39 this.rollDistance = rollDistance; 40 } 41 42 @Override parse(ByteBuffer byteBuffer)43 public void parse(ByteBuffer byteBuffer) { 44 rollDistance = byteBuffer.getShort(); 45 } 46 47 @Override get()48 public ByteBuffer get() { 49 ByteBuffer content = ByteBuffer.allocate(2); 50 content.putShort(rollDistance); 51 content.rewind(); 52 return content; 53 } 54 55 @Override equals(Object o)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 hashCode()74 public int hashCode() { 75 return (int) rollDistance; 76 } 77 } 78