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A generic parser and writer for all ISO 14496 based files (MP4, Quicktime, DCF, PDCF, ...)

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/*  
 * Copyright 2008 CoreMedia AG, Hamburg
 *
 * Licensed under the Apache License, Version 2.0 (the License); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an AS IS BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License. 
 */

package com.coremedia.iso.boxes;


import com.coremedia.iso.BoxParser;
import com.coremedia.iso.IsoTypeWriter;
import com.googlecode.mp4parser.util.ChannelHelper;

import java.io.IOException;
import java.nio.ByteBuffer;

import com.googlecode.mp4parser.DataSource;

import java.nio.channels.WritableByteChannel;
import java.util.LinkedList;
import java.util.List;

import static com.googlecode.mp4parser.util.CastUtils.l2i;

/**
 * 

4cc = "{@value #TYPE}"

* A free box. Just a placeholder to enable editing without rewriting the whole file. */ public class FreeBox implements Box { public static final String TYPE = "free"; ByteBuffer data; List replacers = new LinkedList(); private Container parent; private long offset; public FreeBox() { this.data = ByteBuffer.wrap(new byte[0]); } public FreeBox(int size) { this.data = ByteBuffer.allocate(size); } public long getOffset() { return offset; } public ByteBuffer getData() { if (data != null) { return (ByteBuffer) data.duplicate().rewind(); } else { return null; } } public void setData(ByteBuffer data) { this.data = data; } public void getBox(WritableByteChannel os) throws IOException { for (Box replacer : replacers) { replacer.getBox(os); } ByteBuffer header = ByteBuffer.allocate(8); IsoTypeWriter.writeUInt32(header, 8 + data.limit()); header.put(TYPE.getBytes()); header.rewind(); os.write(header); header.rewind(); data.rewind(); os.write(data); data.rewind(); } public Container getParent() { return parent; } public void setParent(Container parent) { this.parent = parent; } public long getSize() { long size = 8; for (Box replacer : replacers) { size += replacer.getSize(); } size += data.limit(); return size; } public String getType() { return TYPE; } public void parse(DataSource dataSource, ByteBuffer header, long contentSize, BoxParser boxParser) throws IOException { this.offset = dataSource.position() - header.remaining(); if (contentSize > 1024 * 1024) { // It's quite expensive to map a file into the memory. Just do it when the box is larger than a MB. data = dataSource.map(dataSource.position(), contentSize); dataSource.position(dataSource.position() + contentSize); } else { assert contentSize < Integer.MAX_VALUE; data = ByteBuffer.allocate(l2i(contentSize)); dataSource.read(data); } } public void addAndReplace(Box box) { data.position(l2i(box.getSize())); data = data.slice(); replacers.add(box); } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; FreeBox freeBox = (FreeBox) o; if (getData() != null ? !getData().equals(freeBox.getData()) : freeBox.getData() != null) return false; return true; } @Override public int hashCode() { return data != null ? data.hashCode() : 0; } }




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