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/*****************************************************************
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
| $Id: Atom.java 196 2008-10-14 22:59:31Z bok $
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
package com.axiosys.bento4;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
public abstract class Atom {
public final static int TYPE_MOOV = 0x6d6f6f76;
public final static int TYPE_TRAK = 0x7472616b;
public final static int TYPE_HNTI = 0x686e7469;
public final static int TYPE_STBL = 0x7374626c;
public final static int TYPE_MDIA = 0x6d646961;
public final static int TYPE_DINF = 0x64696e66;
public final static int TYPE_MINF = 0x6d696e66;
public final static int TYPE_SCHI = 0x73636869;
public final static int TYPE_SINF = 0x73696e66;
public final static int TYPE_UDTA = 0x75647461;
public final static int TYPE_ILST = 0x696c7374;
public final static int TYPE_EDTS = 0x65647473;
public final static int TYPE_META = 0x6d657461;
public final static int TYPE_STSD = 0x73747364;
public final static int TYPE_MP4A = 0x6d703461;
public final static int TYPE_ENCA = 0x656e6361;
public final static int TYPE_MP4V = 0x6d703476;
public final static int TYPE_ENCV = 0x656e6376;
public final static int TYPE_IKMS = 0x694b4d53;
public final static int TYPE_TKHD = 0x746b6864;
public final static int TYPE_SCHM = 0x7363686d;
public final static int TYPE_HDLR = 0x68646c72;
public final static int TYPE_ODKM = 0x6f646b6d;
public final static int TYPE_ODAF = 0x6f646166;
public final static int TYPE_OHDR = 0x6f686472;
public final static int HEADER_SIZE = 8;
public final static int FULL_HEADER_SIZE = 12;
// members
protected int type;
protected int size;
protected int flags;
protected int version;
protected boolean isFull;
public static String typeString(int type) {
StringBuffer result = new StringBuffer(4);
result.append((char)((type>>24)&0xFF));
result.append((char)((type>>16)&0xFF));
result.append((char)((type>> 8)&0xFF));
result.append((char)((type )&0xFF));
return result.toString();
}
public static int nameToType(String name) {
return ((name.charAt(0)&0xFF)<<24) |
((name.charAt(1)&0xFF)<<16) |
((name.charAt(2)&0xFF)<< 8) |
((name.charAt(3)&0xFF));
}
public Atom(int type, int size, boolean isFull) {
this.type = type;
this.size = size;
this.isFull = isFull;
}
public Atom(int type, int size, boolean isFull, RandomAccessFile source) throws IOException {
this(type, size, isFull);
if (isFull) {
// read the version and flags
int extension = source.readInt();
version = (extension>>24)&0xFF;
flags = extension&0xFFFFFF;
} else {
this.flags = 0;
this.version = 0;
}
}
public int getType() { return type; }
public int getSize() { return size; }
public int getHeaderSize() { return isFull?FULL_HEADER_SIZE:HEADER_SIZE; }
public int getPayloadSize() { return size-getHeaderSize(); }
public void write(DataOutputStream stream) throws IOException {
// write the header
writeHeader(stream);
// write the fields
writeFields(stream);
}
public void writeHeader(DataOutputStream stream) throws IOException {
// write the size
stream.writeInt(size);
// write the type
stream.writeInt(type);
// for full atoms, write version and flags
if (isFull) {
stream.writeInt(version<<24 | flags);
}
}
protected abstract void writeFields(DataOutputStream stream) throws IOException;
public byte[] toBytes() throws IOException {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
DataOutputStream output = new DataOutputStream(stream);
write(output);
return stream.toByteArray();
}
public byte[] getPayload() throws IOException {
byte[] bytes = toBytes();
byte[] result = new byte[getPayloadSize()];
System.arraycopy(bytes, getHeaderSize(), result, 0, result.length);
return result;
}
public String toString(String indentation) {
return indentation+"[" + typeString(type) + "] size=" + getHeaderSize() + "+" + getPayloadSize();
}
public String toString() {
return toString("");
}
}
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