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 ;

}

}