IntraFrame.java

/*
 * myLib - https://github.com/taktod/myLib
 * Copyright (c) 2014 ttProject. All rights reserved.
 * 
 * Licensed under The MIT license.
 */
package com.ttProject.frame.vp6.type;

import java.nio.ByteBuffer;

import com.ttProject.frame.vp6.Vp6Frame;
import com.ttProject.nio.channels.IReadChannel;
import com.ttProject.unit.extra.BitConnector;
import com.ttProject.unit.extra.BitLoader;
import com.ttProject.unit.extra.bit.Bit16;
import com.ttProject.unit.extra.bit.Bit1;
import com.ttProject.unit.extra.bit.Bit2;
import com.ttProject.unit.extra.bit.Bit5;
import com.ttProject.unit.extra.bit.Bit6;
import com.ttProject.unit.extra.bit.Bit8;
import com.ttProject.util.BufferUtil;

/**
 * keyFrame for vp6
 * @author taktod
 */
public class IntraFrame extends Vp6Frame {
	private Bit5  version   = new Bit5();
	private Bit2  version2  = new Bit2();
	private Bit1  interlace = new Bit1();
	private Bit16 offset    = null; // 16bit
	private Bit8  dimY      = new Bit8(); // x16 height 
	private Bit8  dimX      = new Bit8(); // x16 width
	private Bit8  renderY   = new Bit8(); // x16 height
	private Bit8  renderX   = new Bit8(); // x16 width

	private ByteBuffer buffer = null;
	/**
	 * constructor
	 */
	public IntraFrame(Bit1 frameMode, Bit6 qp, Bit1 marker) {
		super(frameMode, qp, marker);
		super.setKeyFrame(true);
	}
	/**
	 * {@inheritDoc}
	 */
	@Override
	public void minimumLoad(IReadChannel channel) throws Exception {
		BitLoader loader = new BitLoader(channel);
		loader.load(version, version2, interlace);
		if(version2.get() == 0 || getMarker().get() == 1) {
			offset = new Bit16();
			loader.load(offset);
		}
		loader.load(dimY, dimX, renderY, renderX);
		super.setWidth(dimX.get() * 16);
		super.setHeight(dimY.get() * 16);
		super.setReadPosition(channel.position());
		super.setSize(channel.size());
		super.update();
	}
	/**
	 * {@inheritDoc}
	 */
	@Override
	public void load(IReadChannel channel) throws Exception {
		channel.position(super.getReadPosition());
		buffer = BufferUtil.safeRead(channel, getSize() - getReadPosition());
	}
	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void requestUpdate() throws Exception {
		if(buffer == null) {
			throw new Exception("buffer is not loaded yet.");
		}
		BitConnector connector = new BitConnector();
		setData(BufferUtil.connect(getHeaderBuffer(),
				connector.connect(version, version2,
						interlace, offset,
						dimY, dimX, renderY, renderX),
				buffer));
	}
	/**
	 * ref the data type. version2?
	 * @return
	 */
	public Bit2 getVersion2() {
		return version2;
	}
	/**
	 * {@inheritDoc}
	 */
	@Override
	public ByteBuffer getPackBuffer() throws Exception {
		return getData();
	}
}