1 package com.googlecode.mp4parser.boxes; 2 3 import com.googlecode.mp4parser.AbstractBox; 4 import com.googlecode.mp4parser.boxes.mp4.objectdescriptors.BitReaderBuffer; 5 import com.googlecode.mp4parser.boxes.mp4.objectdescriptors.BitWriterBuffer; 6 7 import java.nio.ByteBuffer; 8 import java.util.LinkedList; 9 import java.util.List; 10 11 /** 12 * 13 */ 14 public class EC3SpecificBox extends AbstractBox { 15 List<Entry> entries = new LinkedList<Entry>(); 16 int dataRate; 17 int numIndSub; 18 EC3SpecificBox()19 public EC3SpecificBox() { 20 super("dec3"); 21 } 22 23 @Override getContentSize()24 public long getContentSize() { 25 long size = 2; 26 for (Entry entry : entries) { 27 if (entry.num_dep_sub > 0) { 28 size += 4; 29 } else { 30 size += 3; 31 } 32 } 33 return size; 34 } 35 36 @Override _parseDetails(ByteBuffer content)37 public void _parseDetails(ByteBuffer content) { 38 BitReaderBuffer brb = new BitReaderBuffer(content); 39 dataRate = brb.readBits(13); 40 numIndSub = brb.readBits(3) + 1; 41 // This field indicates the number of independent substreams that are present in the Enhanced AC-3 bitstream. The value 42 // of this field is one less than the number of independent substreams present. 43 44 45 for (int i = 0; i < numIndSub; i++) { 46 Entry e = new Entry(); 47 e.fscod = brb.readBits(2); 48 e.bsid = brb.readBits(5); 49 e.bsmod = brb.readBits(5); 50 e.acmod = brb.readBits(3); 51 e.lfeon = brb.readBits(1); 52 e.reserved = brb.readBits(3); 53 e.num_dep_sub = brb.readBits(4); 54 if (e.num_dep_sub > 0) { 55 e.chan_loc = brb.readBits(9); 56 } else { 57 e.reserved2 = brb.readBits(1); 58 } 59 entries.add(e); 60 } 61 } 62 63 @Override getContent(ByteBuffer byteBuffer)64 public void getContent(ByteBuffer byteBuffer) { 65 BitWriterBuffer bwb = new BitWriterBuffer(byteBuffer); 66 bwb.writeBits(dataRate, 13); 67 bwb.writeBits(entries.size() - 1, 3); 68 for (Entry e : entries) { 69 bwb.writeBits(e.fscod, 2); 70 bwb.writeBits(e.bsid, 5); 71 bwb.writeBits(e.bsmod, 5); 72 bwb.writeBits(e.acmod, 3); 73 bwb.writeBits(e.lfeon, 1); 74 bwb.writeBits(e.reserved, 3); 75 bwb.writeBits(e.num_dep_sub, 4); 76 if (e.num_dep_sub > 0) { 77 bwb.writeBits(e.chan_loc, 9); 78 } else { 79 bwb.writeBits(e.reserved2, 1); 80 } 81 } 82 } 83 84 getEntries()85 public List<Entry> getEntries() { 86 return entries; 87 } 88 setEntries(List<Entry> entries)89 public void setEntries(List<Entry> entries) { 90 this.entries = entries; 91 } 92 addEntry(Entry entry)93 public void addEntry(Entry entry) { 94 this.entries.add(entry); 95 } 96 getDataRate()97 public int getDataRate() { 98 return dataRate; 99 } 100 setDataRate(int dataRate)101 public void setDataRate(int dataRate) { 102 this.dataRate = dataRate; 103 } 104 getNumIndSub()105 public int getNumIndSub() { 106 return numIndSub; 107 } 108 setNumIndSub(int numIndSub)109 public void setNumIndSub(int numIndSub) { 110 this.numIndSub = numIndSub; 111 } 112 113 public static class Entry { 114 public int fscod; 115 public int bsid; 116 public int bsmod; 117 public int acmod; 118 public int lfeon; 119 public int reserved; 120 public int num_dep_sub; 121 public int chan_loc; 122 public int reserved2; 123 124 125 @Override toString()126 public String toString() { 127 return "Entry{" + 128 "fscod=" + fscod + 129 ", bsid=" + bsid + 130 ", bsmod=" + bsmod + 131 ", acmod=" + acmod + 132 ", lfeon=" + lfeon + 133 ", reserved=" + reserved + 134 ", num_dep_sub=" + num_dep_sub + 135 ", chan_loc=" + chan_loc + 136 ", reserved2=" + reserved2 + 137 '}'; 138 } 139 } 140 } 141