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Atom.java
资源名称：fullMPCcode.rar　[点击查看]
上传用户：xjjlds
上传日期：2015-12-05
资源大小：22823k
文件大小：4k
源码类别：

多媒体编程

开发平台：

Visual C++

Atom.java：源码内容
  1. package com.axiosys.bento4;
  3. import java.io.ByteArrayOutputStream;
  4. import java.io.DataOutputStream;
  5. import java.io.IOException;
  6. import java.io.RandomAccessFile;
  8. public abstract class Atom {
  9.     public final static int TYPE_MOOV = 0x6d6f6f76;
  10.     public final static int TYPE_TRAK = 0x7472616b;
  11.     public final static int TYPE_HNTI = 0x686e7469;
  12.     public final static int TYPE_STBL = 0x7374626c;
  13.     public final static int TYPE_MDIA = 0x6d646961;
  14.     public final static int TYPE_DINF = 0x64696e66;
  15.     public final static int TYPE_MINF = 0x6d696e66;
  16.     public final static int TYPE_SCHI = 0x73636869;
  17.     public final static int TYPE_SINF = 0x73696e66;
  18.     public final static int TYPE_UDTA = 0x75647461;
  19.     public final static int TYPE_ILST = 0x696c7374;
  20.     public final static int TYPE_EDTS = 0x65647473;
  21.     public final static int TYPE_META = 0x6d657461;
  22.     public final static int TYPE_STSD = 0x73747364;    
  23.     public final static int TYPE_MP4A = 0x6d703461;
  24.     public final static int TYPE_ENCA = 0x656e6361;
  25.     public final static int TYPE_MP4V = 0x6d703476;
  26.     public final static int TYPE_ENCV = 0x656e6376;
  27.     public final static int TYPE_IKMS = 0x694b4d53;
  28.     public final static int TYPE_TKHD = 0x746b6864;
  29.     public final static int TYPE_SCHM = 0x7363686d;
  30.     public final static int TYPE_HDLR = 0x68646c72;
  31.     
  32.     public final static int HEADER_SIZE      = 8;
  33.     public final static int FULL_HEADER_SIZE = 12;
  34.     
  35.     // members
  36.     protected int type;
  37.     protected int size;
  38.     protected int flags;
  39.     protected int version;
  40.     protected boolean isFull;
  41.     
  42.     public static String typeString(int type) {
  43.         StringBuffer result = new StringBuffer(4);
  44.     
  45.         result.append((char)((type>>24)&0xFF));
  46.         result.append((char)((type>>16)&0xFF));
  47.         result.append((char)((type>> 8)&0xFF));
  48.         result.append((char)((type    )&0xFF));
  50.         return result.toString();
  51.     }
  52.     
  53.     public static int nameToType(String name) {
  54.         return ((name.charAt(0)&0xFF)<<24) |
  55.                ((name.charAt(1)&0xFF)<<16) |
  56.                ((name.charAt(2)&0xFF)<< 8) |
  57.                ((name.charAt(3)&0xFF));
  58.     }
  59.         
  60.     public Atom(int type, int size, boolean isFull) {
  61.         this.type = type;
  62.         this.size = size;
  63.         this.isFull = isFull;        
  64.     }
  65.     
  66.     public Atom(int type, int size, boolean isFull, RandomAccessFile source) throws IOException {
  67.         this(type, size, isFull);
  68.         if (isFull) {
  69.             // read the version and flags
  70.             int extension = source.readInt();
  71.             version = (extension>>24)&0xFF;
  72.             flags   =  extension&0xFFFFFF;
  73.         } else {
  74.             this.flags = 0;
  75.             this.version = 0;
  76.         }
  77.     }
  79.     public int getType()        { return type;                                }
  80.     public int getSize()        { return size;                                }
  81.     public int getHeaderSize()  { return isFull?FULL_HEADER_SIZE:HEADER_SIZE; }
  82.     public int getPayloadSize() { return size-getHeaderSize();                }
  83.     
  84.     public void write(DataOutputStream stream) throws IOException {
  85.         // write the header
  86.         writeHeader(stream);
  88.         // write the fields
  89.         writeFields(stream);
  90.     }
  91.     
  92.     public void writeHeader(DataOutputStream stream) throws IOException {
  93.         // write the size
  94.         stream.writeInt(size);
  96.         // write the type
  97.         stream.writeInt(type);
  99.         // for full atoms, write version and flags
  100.         if (isFull) {
  101.             stream.writeInt(version<<24 | flags);
  102.         }        
  103.     }
  104.     
  105.     protected abstract void writeFields(DataOutputStream stream) throws IOException;
  106.     
  107.     public byte[] toBytes() throws IOException {
  108.         ByteArrayOutputStream stream = new ByteArrayOutputStream();
  109.         DataOutputStream output = new DataOutputStream(stream);
  110.         write(output);
  111.         
  112.         return stream.toByteArray();
  113.     }
  114.     
  115.     public byte[] getPayload() throws IOException {
  116.         byte[] bytes = toBytes();
  117.         byte[] result = new byte[getPayloadSize()];
  118.         System.arraycopy(bytes, getHeaderSize(), result, 0, result.length);
  119.         
  120.         return result;
  121.     }
  122.     
  123.     public String toString(String indentation) {
  124.         return indentation+"[" + typeString(type) + "] size=" + getHeaderSize() + "+" + getPayloadSize();
  125.     }
  126.     
  127.     public String toString() {
  128.         return toString("");
  129.     }
  130. }