把V3音频文件转化为wav文件的算法，v3wav,import java.

把V3音频文件转化为wav文件的算法，v3wav,import java.

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import org.apache.commons.net.ftp.FTPClient;import org.apache.commons.net.ftp.FTPClientConfig;import org.apache.commons.net.ftp.FTPFile;import com.eshore.ccf.CCFLogger;public class V3FileUtil {    private String voxfreq = "6000";    public V3FileUtil() {    }    public void long2Byte(byte[] output, long[] input, int len) {        int i, j;        for (i = 0, j = 0; j < len; i++, j += 4) {            output[j] = (byte) (input[i] & 0xffL);            output[j + 1] = (byte) ((input[i] >>> 8) & 0xffL);            output[j + 2] = (byte) ((input[i] >>> 16) & 0xffL);            output[j + 3] = (byte) ((input[i] >>> 24) & 0xffL);        }    }    public void short2Byte(byte[] output, short sh) {        output[0] = (byte) (sh & 0xffL);        output[1] = (byte) ((sh >>> 8) & 0xffL);    }    public short byte2Short(byte b) {        return b < 0 ? (short) (b & 0x7F + 128) : b;    }    public void convert(String v3File , String wavFile) throws Exception{        BufferedInputStream fileInput = null;        BufferedOutputStream fileOut = null;        int[] indsft = { -1, -1, -1,-1, 2, 4, 6, 8 };        int[] stpsz = { 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, 50, 55,                60, 66, 73, 80, 88, 97, 107, 118, 130, 143, 157, 173, 190, 209,                230, 253, 279, 307, 337, 371, 408, 449, 494, 544, 598, 658,                724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878,                2066, 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871,                5358, 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635,                13899, 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794 };        /* nibble to bit map */        int nbl2bit[][] = { { 0, 0, 0, 0 }, { 0, 0, 0, 1 }, { 0, 0, 1, 0 },                { 0, 0, 1, 1 }, { 0, 1, 0, 0 }, { 0, 1, 0, 1 }, { 0, 1, 1, 0 },                { 0, 1, 1, 1 }, { 1, 0, 0, 0 }, { 1, 0, 0, 1 }, { 1, 0, 1, 0 },                { 1, 0, 1, 1 }, { 1, 1, 0, 0 }, { 1, 1, 0, 1 }, { 1, 1, 1, 0 },                { 1, 1, 1, 1 } };        /* sign table */        int sgns[] = { 1, -1 };        File file = new File(v3File);        /* step size index */        int ssindex = 0;            if(file == null) {                CCFLogger.logger.info("没有找到文件:" + v3File);                return ;            }            fileInput = new BufferedInputStream(new FileInputStream(file));            fileOut = new BufferedOutputStream (new FileOutputStream(wavFile));            long lPCMHDR[] = { 0x46464952, 0, 0x45564157, 0x20746d66, 16,                    0x10001, 0, 0, 0x100002, 0x61746164, 0 };            lPCMHDR[1] = 4 * file.length() + 0x30; // 文件长度            lPCMHDR[6] = Integer.parseInt(voxfreq);            lPCMHDR[7] = 2 * Integer.parseInt(voxfreq);            lPCMHDR[10] = 4 * file.length();            // 先写一个头            byte[] b = new byte[44];            long2Byte(b, lPCMHDR, 44);            fileOut.write(b, (int) 0, b.length);            short iVal = 0;            int pos = 0;            byte[] szBuf = new byte[128 * 1024];            int diff;            short incoded;            byte[] szDesBuf = new byte[4 * 128 * 1024];            int dwRead = 0;            while ((dwRead = fileInput.read(szBuf, 0, 128 * 1024))!= -1) {                for (int idx = 0; idx < dwRead - 1; idx++) {                    incoded = (short) (byte2Short(szBuf[idx]) / 16);                    diff = sgns[nbl2bit[incoded][0]]                            * (stpsz[ssindex] * nbl2bit[incoded][1]                                    + (stpsz[ssindex] / 2)                                    * nbl2bit[incoded][2]                                    + (stpsz[ssindex] / 4)                                    * nbl2bit[incoded][3] + (stpsz[ssindex] / 8));                    ssindex = ssindex + indsft[(incoded % 8)];                    if (ssindex < 0)                        ssindex = 0;                    if (ssindex > 48)                        ssindex = 48;                    iVal += diff;                    if (iVal > 2047)                        iVal = 2047;                    else if (iVal < -2047)                        iVal = -2047;                    byte[] b2 = new byte[2];                    short2Byte(b2, (short) (iVal * 16));                    szDesBuf[pos] = b2[0];                    pos++;                    szDesBuf[pos] = b2[1];                    pos++;                    // /////////////////////////////////////////////////                    incoded = (short) (byte2Short(szBuf[idx]) % 16);                    diff = sgns[nbl2bit[incoded][0]]                            * (stpsz[ssindex] * nbl2bit[incoded][1]                                    + (stpsz[ssindex] / 2)                                    * nbl2bit[incoded][2]                                    + (stpsz[ssindex] / 4)                                    * nbl2bit[incoded][3] + (stpsz[ssindex] / 8));                    ssindex = ssindex + indsft[(incoded % 8)];                    if (ssindex < 0)                        ssindex = 0;                    if (ssindex > 48)                        ssindex = 48;                    iVal += diff;                    //波长                    if (iVal > 2047)                        iVal = 2047;                    else if (iVal < -2047)                        iVal = -2047;                    byte[] b3 = new byte[2];                    short2Byte(b3, (short) (iVal * 16));                    szDesBuf[pos] = b3[0];                    pos++;                    szDesBuf[pos] = b3[1];                    pos++;                }                try {                    fileOut.write(szDesBuf, 0,  dwRead * 4 );                    fileOut.flush();                } catch (Exception e) {                    CCFLogger.logger.error("转换文件失败！", e);                }                pos = 0;            }            CCFLogger.logger.error("转换文件到wav成功.......................");            try {                if (fileInput != null) fileInput.close();                if (fileOut != null) fileOut.close();            } catch (IOException e) {}            return ;    }}//该片段来自于http://byrx.net