mp3.txt

用 JAVA 编写的一个 MP3 播放器的 源代码 自己调试下

package javazoom.Util;

/**
* This class implements a BMP Loader.
*
*-----------------------------------------------------------------------
*  This program 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 of the License, or
*  (at your option) any later version.
*
*  This program 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 this program; if not, write to the Free Software
*  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*----------------------------------------------------------------------
*/

import java.awt.*;
import java.awt.image.*;
import java.io.*;

/**
* A decoder for Windows bitmap (.BMP) files.
* Compression not supported.
*/
public class BMPLoader
{
private InputStream is;
private int curPos = 0;

private int bitmapOffset; // starting position of image data

private int width; // image width in pixels
private int height; // image height in pixels
private short bitsPerPixel; // 1, 4, 8, or 24 (no color map)
private int compression; // 0 (none), 1 (8-bit RLE), or 2 (4-bit RLE)
private int actualSizeOfBitmap;
private int scanLineSize;
private int actualColorsUsed;

private byte r[], g[], b[]; // color palette
private int noOfEntries;

private byte[] byteData; // Unpacked data
private int[] intData; // Unpacked data

public BMPLoader()
{
}

   public Image getBMPImage(InputStream stream) throws Exception
   {
read(stream);
return Toolkit.getDefaultToolkit().createImage(getImageSource());
}

private int readInt() throws IOException {
int b1 = is.read();
int b2 = is.read();
int b3 = is.read();
int b4 = is.read();
curPos += 4;
return ((b4 << 24) + (b3 << 16) + (b2 << 8) + (b1 << 0));
}


private short readShort() throws IOException {
int b1 = is.read();
int b2 = is.read();
curPos += 4;
return (short)((b2 << 8) + b1);
}


void getFileHeader()  throws IOException, Exception {
// Actual contents (14 bytes):
short fileType = 0x4d42;// always "BM"
int fileSize; // size of file in bytes
short reserved1 = 0; // always 0
short reserved2 = 0; // always 0

fileType = readShort();
if (fileType != 0x4d42)
throw new Exception("Not a BMP file"); // wrong file type
fileSize = readInt();
reserved1 = readShort();
reserved2 = readShort();
bitmapOffset = readInt();
}

void getBitmapHeader() throws IOException {

// Actual contents (40 bytes):
int size; // size of this header in bytes
short planes; // no. of color planes: always 1
int sizeOfBitmap; // size of bitmap in bytes (may be 0: if so, calculate)
int horzResolution; // horizontal resolution, pixels/meter (may be 0)
int vertResolution; // vertical resolution, pixels/meter (may be 0)
int colorsUsed; // no. of colors in palette (if 0, calculate)
int colorsImportant; // no. of important colors (appear first in palette) (0 means all are important)
boolean topDown;
int noOfPixels;

size = readInt();
width = readInt();
height = readInt();
planes = readShort();
bitsPerPixel = readShort();
compression = readInt();
sizeOfBitmap = readInt();
horzResolution = readInt();
vertResolution = readInt();
colorsUsed = readInt();
colorsImportant = readInt();

topDown = (height < 0);
noOfPixels = width * height;

// Scan line is padded with zeroes to be a multiple of four bytes
scanLineSize = ((width * bitsPerPixel + 31) / 32) * 4;

if (sizeOfBitmap != 0)
actualSizeOfBitmap = sizeOfBitmap;
else