Current File : //home/waritko/build/Bento4/Source/Java/com/axiosys/bento4/AtomFactory.java
/*****************************************************************
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
| $Id: AtomFactory.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.IOException;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import com.axiosys.bento4.dcf.OdafAtom;
import com.axiosys.bento4.dcf.OhdrAtom;
import com.axiosys.bento4.ismacryp.IkmsAtom;
import com.axiosys.bento4.metadata.MetaDataTypeHandler;
public class AtomFactory {
public static final AtomFactory DefaultFactory = new AtomFactory();
private int context = 0;
private List typeHandlers = new ArrayList();
public AtomFactory() {
// add builtin type handler
typeHandlers.add(new MetaDataTypeHandler(this));
}
public Atom createAtom(RandomAccessFile file) throws IOException, InvalidFormatException {
return createAtom(file, new int[] { (int) (file.length()-file.getFilePointer()) });
}
public void addTypeHandler(TypeHandler handler) {
typeHandlers.add(handler);
}
public void setContext(int context) {
this.context = context;
}
public int getContext() {
return context;
}
Atom createAtom(RandomAccessFile source, int[] bytesAvailable /* by reference */) throws IOException, InvalidFormatException {
Atom atom = null;
// check that there are enough bytes for at least a header
if (bytesAvailable[0] < Atom.HEADER_SIZE) return null;
// remember current file offset
long start = source.getFilePointer();
// read atom size
int size = source.readInt();
if (size == 0) {
// atom extends to end of file
size = (int)(source.length()-start);
}
// check the size (we don't handle extended size yet)
if (size > bytesAvailable[0]) {
source.seek(start);
return null;
}
if (size < 0) {
// something is corrupted
throw new InvalidFormatException("invalid atom size");
}
// read atom type
int type = source.readInt();
// create the atom
switch (type) {
case Atom.TYPE_STSD:
atom = new StsdAtom(size, source, this);
break;
case Atom.TYPE_SCHM:
atom = new SchmAtom(size, source);
break;
case Atom.TYPE_IKMS:
atom = new IkmsAtom(size, source);
break;
case Atom.TYPE_TRAK:
atom = new TrakAtom(size, source, this);
break;
case Atom.TYPE_TKHD:
atom = new TkhdAtom(size, source);
break;
case Atom.TYPE_HDLR:
atom = new HdlrAtom(size, source);
break;
case Atom.TYPE_ODAF:
atom = new OdafAtom(size, source);
break;
case Atom.TYPE_OHDR:
atom = new OhdrAtom(size, source, this);
break;
// container atoms
case Atom.TYPE_MOOV:
case Atom.TYPE_HNTI:
case Atom.TYPE_STBL:
case Atom.TYPE_MDIA:
case Atom.TYPE_DINF:
case Atom.TYPE_MINF:
case Atom.TYPE_SCHI:
case Atom.TYPE_SINF:
case Atom.TYPE_UDTA:
case Atom.TYPE_ILST:
case Atom.TYPE_EDTS:
atom = new ContainerAtom(type, size, false, source, this);
break;
// full container atoms
case Atom.TYPE_META:
case Atom.TYPE_ODKM:
atom = new ContainerAtom(type, size, true, source, this);
break;
// sample entries
case Atom.TYPE_MP4A:
atom = new Mp4aSampleEntry(size, source, this);
break;
case Atom.TYPE_MP4V:
atom = new Mp4vSampleEntry(size, source, this);
break;
case Atom.TYPE_ENCA:
atom = new EncaSampleEntry(size, source, this);
break;
case Atom.TYPE_ENCV:
atom = new EncvSampleEntry(size, source, this);
break;
default:
// try all external type handlers
for (Iterator i=typeHandlers.iterator(); i.hasNext();) {
TypeHandler handler = (TypeHandler)i.next();
atom = handler.createAtom(type, size, source, context);
if (atom != null) break;
}
// not type handler could handle this, create a generic atom
if (atom == null) atom = new UnknownAtom(type, size, source);
break;
}
// skip to the end of the atom
bytesAvailable[0] -= size;
source.seek(start+size);
return atom;
}
}
Mini Shell