jpegformat.java

FMJ（freedom media for java)是java视频开发的新选择

package javax.media.format;

import javax.media.Format;

import net.sf.fmj.utility.FormatUtils;

/**
 * Coding complete.
 * @author Ken Larson
 *
 */
public class JPEGFormat extends VideoFormat
{

	public static final int DEC_422 = 0;
	public static final int DEC_420 = 1;
	public static final int DEC_444 = 2;
	public static final int DEC_402 = 3;
	public static final int DEC_411 = 4;

	int qFactor = NOT_SPECIFIED;
	int decimation = NOT_SPECIFIED;
	
	public JPEGFormat()
	{
		super(JPEG);
		dataType = Format.byteArray;

	}
	
	public JPEGFormat(java.awt.Dimension size,
            int maxDataLength,
            Class dataType,
            float frameRate,
            int q,
            int dec)
	{
		super(JPEG, size, maxDataLength, dataType, frameRate);
		this.qFactor = q;
		this.decimation = dec;

	}
	
	public int getQFactor()
	{	return qFactor;
	}
	
	public int getDecimation()
	{	return decimation;
	}
	
	public Object clone()
	{	return new JPEGFormat(FormatUtils.clone(size), maxDataLength, dataType, frameRate, qFactor, decimation);
	}
	
	protected void copy(Format f)
	{
		super.copy(f);
		final JPEGFormat oCast = (JPEGFormat) f;	// it has to be a JPEGFormat, or ClassCastException will be thrown.
		this.qFactor = oCast.qFactor;
		this.decimation = oCast.decimation;
	}
	
	public String toString()
	{
		// examples:
		// jpeg video format: dataType = class [B
		// jpeg video format: size = 1x1 FrameRate = 1.0 maxDataLength = 1000 dataType = class [S q factor = 2 decimation = 3
		// jpeg video format: size = 1x1 FrameRate = 1.0 maxDataLength = 1000 dataType = class [S decimation = 3
	
		final StringBuffer b = new StringBuffer();
		b.append("jpeg video format:");
		if (FormatUtils.specified(size))
			b.append(" size = " + size.width + "x" + size.height);
		if (FormatUtils.specified(frameRate))
			b.append(" FrameRate = " + frameRate);
		if (FormatUtils.specified(maxDataLength))
			b.append(" maxDataLength = " + maxDataLength);
		if (FormatUtils.specified(dataType))
			b.append(" dataType = " + dataType);
		if (FormatUtils.specified(qFactor))
			b.append(" q factor = " + qFactor);
		if (FormatUtils.specified(decimation))
			b.append(" decimation = " + decimation);
		
		return b.toString();
	}
	
	public boolean equals(Object format)
	{
		if (!super.equals(format))
			return false;
		
		if (!(format instanceof JPEGFormat))	
		{
			return false;
		}
		
		final JPEGFormat oCast = (JPEGFormat) format;
		return 
			this.qFactor == oCast.qFactor &&
			this.decimation == oCast.decimation;	
	}
	
	public boolean matches(Format format)
	{
		if (!super.matches(format))
		{	
			FormatUtils.traceMatches(this, format, false);
			return false;
		}
		
		if (!(format instanceof JPEGFormat))
		{	
			final boolean result = true;
			FormatUtils.traceMatches(this, format, result);
			return result;
		}
		
		final JPEGFormat oCast = (JPEGFormat) format;

		final boolean result = 
			FormatUtils.matches(oCast.qFactor, this.qFactor) &&
			FormatUtils.matches(oCast.decimation, this.decimation);
		
		FormatUtils.traceMatches(this, format, result);
		
		return result;
	}
	
	public Format intersects(Format other)
	{
		final Format result = super.intersects(other);

		if (other instanceof JPEGFormat)
		{
			final JPEGFormat resultCast = (JPEGFormat) result;
			
			final JPEGFormat oCast = (JPEGFormat) other;
			if (getClass().isAssignableFrom(other.getClass()))
			{	
				// "other" was cloned.
				
				if (FormatUtils.specified(this.qFactor))
					resultCast.qFactor = this.qFactor;
				if (FormatUtils.specified(this.decimation))
					resultCast.decimation = this.decimation;
				
				
			}
			else if (other.getClass().isAssignableFrom(getClass()))
			{	// this was cloned
				
				if (!FormatUtils.specified(resultCast.qFactor))
					resultCast.qFactor = oCast.qFactor;
				if (!FormatUtils.specified(resultCast.decimation))
					resultCast.decimation = oCast.decimation;
			
			
			}
		}
		
		FormatUtils.traceIntersects(this, other, result);
		
		return result;
	}
}