bitmapinfo.java

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

package com.sun.media.vfw;

import java.awt.Dimension;

import javax.media.format.RGBFormat;
import javax.media.format.VideoFormat;
import javax.media.format.YUVFormat;

import com.sun.media.format.AviVideoFormat;

/**
 * 
 * @author Ken Larson
 *
 */
public class BitMapInfo
{
	public int biWidth;
	public int biHeight;
	public int biPlanes;
	public int biBitCount;
	public String fourcc;
	public int biSizeImage;
	public int biXPelsPerMeter;
	public int biYPelsPerMeter;
	public int biClrUsed;
	public int biClrImportant;
	public int extraSize;
	public byte[] extraBytes;
	
	public BitMapInfo()
	{
		this.fourcc = "";
		this.biPlanes = 1;
		this.biBitCount = 24;
		
	}
	
	public BitMapInfo(String fourcc, int width, int height)
	{
		this.fourcc = fourcc;
		this.biPlanes = 1;
		this.biBitCount = 24;
		this.biWidth = width;
		this.biHeight = height;
		
		if (fourcc.equals("RGB"))
		{
			this.biSizeImage = biWidth * biHeight * (biBitCount / 8);
		}
		
	}

	public BitMapInfo(String fourcc, int width, int height, int planes, int bitcount, int sizeImage, int clrused, int clrimportant)
	{
		this.fourcc = fourcc;
		this.biPlanes = planes;
		this.biBitCount = bitcount;
		this.biWidth = width;
		this.biHeight = height;
		this.biSizeImage = sizeImage;
		this.biClrUsed = clrused;
		this.biClrImportant = clrimportant;
	}
	
	public BitMapInfo(VideoFormat format)
	{
		if (format instanceof RGBFormat)
		{
			final RGBFormat fCast = (RGBFormat) format;
			this.fourcc = fCast.getEncoding().toUpperCase();
			this.biPlanes = 1;
			this.biBitCount = fCast.getBitsPerPixel();
			if (fCast.getSize() == null)
			{
				this.biWidth = 320;
				this.biHeight = 240;
			}
			else
			{
				this.biWidth = fCast.getSize().width;
				this.biHeight = fCast.getSize().height;
			}
			if (biBitCount == -1)
				this.biSizeImage = -2;
			else
				this.biSizeImage = biWidth * biHeight * (biBitCount / 8);
			this.biClrUsed = 0;
			this.biClrImportant = 0;
		}
		else if (format instanceof AviVideoFormat)
		{
			final AviVideoFormat fCast = (AviVideoFormat) format;
			this.fourcc = fCast.getEncoding();
			this.biPlanes = fCast.getPlanes();
			this.biBitCount = fCast.getBitsPerPixel();
			this.biWidth = fCast.getSize().width;
			this.biHeight = fCast.getSize().height;
			this.biSizeImage = fCast.getImageSize();
			this.biClrUsed = fCast.getClrUsed();
			this.biClrImportant = fCast.getClrImportant();
		}
		else if (format instanceof YUVFormat)
		{
			final YUVFormat fCast = (YUVFormat) format;
			if (fCast.getYuvType() == YUVFormat.YUV_420)
			{	this.fourcc = "YV12";
				this.biBitCount = 12;
			}
			else
			{
				this.fourcc = format.getEncoding();
				this.biBitCount = 24;
			}
			
			// TODO: what if size is set?
			this.biWidth = 320;
			this.biHeight = 240;
			this.biPlanes = 1;
			this.biSizeImage = -1;
		}
		else
		{
			this.fourcc = format.getEncoding();
			this.biBitCount = 24;
//			 TODO: what if size is set?
			this.biWidth = 320;
			this.biHeight = 240;
			this.biPlanes = 1;
			this.biSizeImage = -1;
		}
	}
	
	public VideoFormat createVideoFormat(Class arrayType)
	{	return createVideoFormat(arrayType, -1.f);
	}
	
	public VideoFormat createVideoFormat(Class arrayType, float frameRate)
	{	
		if (fourcc.equals("RGB"))
		{	
			final int red, green, blue;
			final int pixelStride;
			final int lineStride;
			final int maxDataLength;
			
			// TODO: this was determined by black-box testing, so we may have missed some cases.
			
			if (biBitCount == 32)
			{
				if (arrayType == int[].class)
				{
					red = 0xFF0000;
					green = 0xFF00;
					blue = 0xFF;
				}
				else
				{
					red = 3;
					green = 2;
					blue = 1;
				}
			}
			else if (biBitCount == 24)
			{	red = 3;
				green = 2;
				blue = 1;
			}
			else if (biBitCount == 16)
			{	
				red = 31744;
				green = 992;
				blue = 31;
			}
			else
			{	red = green = blue = -1;
			}
			

			if (arrayType == int[].class)
			{
				pixelStride = biBitCount / 32;
				maxDataLength = biSizeImage / 4;
			}
			else if (arrayType == byte[].class)
			{	
				pixelStride = biBitCount / 8;
				maxDataLength = biSizeImage;
			}
			else if (arrayType == short[].class)
			{	
				pixelStride = biBitCount / 16;
				maxDataLength = biSizeImage / 2;

				
			}
			else
			{	pixelStride = 0;
				maxDataLength = 0;
				throw new IllegalArgumentException();
			}
			
			lineStride = pixelStride * biWidth;
			
			// TODO: other biBitCount values?
			
			
			
				
			return new RGBFormat(new Dimension(biWidth, biHeight),
					maxDataLength,
					arrayType,
					frameRate,
					biBitCount, 
					red, 
					green, 
					blue, 
					pixelStride,  
					lineStride,  
					1,  // flipped, 
					1  //  endian
					);
		
		}
		else if (fourcc.equals("YV12"))
		{
			return new YUVFormat(new Dimension(biWidth, biHeight), 
					biSizeImage, 
					byte[].class,
					frameRate,
					YUVFormat.YUV_420,
					biWidth,	// stride y
					biWidth / 2, // stride uv
					0, // offset y
					biWidth *  biHeight + (biWidth *  biHeight) / 4, // offset u
					biWidth *  biHeight // offset v
					);
					

		}
		else if (fourcc.equals("I420"))
		{
			return new YUVFormat(new Dimension(biWidth, biHeight), 
					biSizeImage, 
					byte[].class,
					frameRate,
					YUVFormat.YUV_420,
					biWidth,	// stride y
					biWidth / 2, // stride uv
					0, // offset y
					// u/v offsts swapped from YV12: (empirically determined)
					biWidth *  biHeight, // offset u
					biWidth *  biHeight + (biWidth *  biHeight) / 4 // offset v
					);
					

		}
		else
		{	return new AviVideoFormat(fourcc, new Dimension(biWidth, biHeight), biSizeImage, arrayType, frameRate, biPlanes, biBitCount, biSizeImage, biXPelsPerMeter, biYPelsPerMeter, biClrUsed, biClrImportant, extraBytes);
		}
		
	}
	
	public String toString()
	{	return "Size = " + biWidth + " x " + biHeight + "	Planes = " + biPlanes + "	BitCount = " + biBitCount + "	FourCC = " + fourcc + "	SizeImage = " + biSizeImage + "\nClrUsed = " + biClrUsed + "\nClrImportant = " + biClrImportant + "\nExtraSize = " + extraSize + "\n";
	}
}