public static void writeByteBuffer(ByteBuffer bbuf, String filename) {
// Write bbuf to filename
File file;
try {
// Get log file
String logfile = "C:\\" + filename + ".txt";
file = new File(logfile);
boolean exists = file.exists();
if (!exists) {
// create a new, empty node file
try {
file = new File(logfile);
boolean success = file.createNewFile();
} catch (IOException e) {
System.out.println("Create Event Log file failed!");
}
}
try {
// Create a writable file channel
FileChannel wChannel = new FileOutputStream(file, true).getChannel();
// Write the ByteBuffer contents; the bytes between the ByteBuffer's
// position and the limit is written to the file
wChannel.write(bbuf);
// Close the file
wChannel.close();
} catch (IOException e) {
}
} catch (java.lang.Exception e) {
}
}
public static void writeLogFile(String descript, String filename) {
File file;
FileOutputStream outstream;
// BufferedWriter outstream;
Date time = new Date();
long bytes = 30000000;
try {
// Get log file
String logfile = "C:\\" + filename + ".txt";
file = new File(logfile);
boolean exists = file.exists();
if (!exists) {
// create a new, empty node file
try {
file = new File(logfile);
boolean success = file.createNewFile();
} catch (IOException e) {
System.out.println("Create Event Log file failed!");
}
}
try {
descript = descript + "\n";
outstream = new FileOutputStream(file, true);
for (int i = 0; i < descript.length(); ++i) {
outstream.write((byte) descript.charAt(i));
}
outstream.close();
} catch (IOException e) {
}
} catch (java.lang.Exception e) {
}
}
/**
* This function writes the generated relative overview to a file.
*
* @param f The file to write to.
* @throws IOException Thrown if unable to open or write to the file.
* @throws InsufficientDataException Thrown if unable to generate the overview.
*/
public void writeToFile(File f) throws IOException, InsufficientDataException {
f.createNewFile();
FileWriter fw = new FileWriter(f);
fw.write(generateOverviewText());
fw.close();
}
public static int decompress(byte[] source) {
int codingparameter, lengthofpacket;
int numdecodedsamples;
int packetbytes_length;
int denomexponent = 14;
int muexponent = 15;
int biasscalebits = 8;
int halfmu = (1 << (muexponent - 1)) - 1;
int biasscalealmosthalf = (1 << (biasscalebits - 1)) - 1;
int Msg_head = 24; // Message header in bytes
int weightqshift = denomexponent + capexponent - weightquantbits + 1;
packetbytes_length = source.length - Msg_head;
decodepacketbitpointer = 0;
decodepacketbytepointer = 0;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 84; j++) {
destination[i][j] = 0;
}
}
decodedfoldedsamples = new int[2048];
decodedunfoldedsamples = new int[2048];
packetdebiasedsamples = new int[2048];
for (int k = 0; k < 2048; k++) {
decodedfoldedsamples[k] = 0;
decodedunfoldedsamples[k] = 0;
packetdebiasedsamples[k] = 0;
}
// Create a logfile
String logfile = "C:\\" + "test_compression_ratio" + ".txt";
compress_logfile = new File(logfile);
boolean exists = compress_logfile.exists();
if (!exists) {
// create a new, empty node file
try {
compress_logfile = new File(logfile);
boolean success = compress_logfile.createNewFile();
} catch (IOException e) {
System.out.println("Create Event Log file failed!");
}
}
time_s = "";
// System.out.println("--------Decompressing start*****************************" + "\n");
numdecodedsamples =
decodepacket(
codeoverheadbits, packetbytes_length, source, Msg_head); // 1 sample costs 2 bytes
// Reset bias estimate based on quantized value just read from packet
// int biasestimate_r = decoderbiasestimate_r;
// System.out.println("The decoded number of sample in the packet =" + numdecodedsamples + " | "
// + "decoded biasestimate: " + biasestimate_r + "\n");
// Reset weight vector based on quantized components just read from packet
for (int i = 0; i < order; i++) {
if (decodedweightquant[i] > 0) {
weight_r[i] = (decodedweightquant[i]) << weightqshift;
} else if (decodedweightquant[i] < 0) {
weight_r[i] = -((-decodedweightquant[i]) << weightqshift);
} else {
weight_r[i] = 0;
}
// System.out.println("decodedweightquant[i]:"+decodedweightquant[i]+"weight_r"+ weight_r[i]+
// "| weightqshift" + weightqshift + "\n");
}
// At this point we have bias estimate and weight vector, and a packet of folded samples.
// follow the prediction procedure to decode each sample given the folded value
for (int i = 0; i < numdecodedsamples; i++) {
int j;
int predicteddebiased_r;
long predictedsample_r;
int err_r; // error in prediction of de-biased signal
int maxsample_r = ((1 << (bitdepth)) - 1) << denomexponent;
int minsample_r = (-(1 << (bitdepth))) << denomexponent;
// System.out.println("max sample value:" + (maxsample_r>>denomexponent) + "\n");
predicteddebiased_r = predictdebiasedsample_r(i);
predictedsample_r = predicteddebiased_r + decoderbiasestimate_r;
// predicted sample value cannot exceed the known instrument dynamic range
if (predictedsample_r > maxsample_r) predictedsample_r = maxsample_r;
if (predictedsample_r < minsample_r) predictedsample_r = minsample_r;
decodedunfoldedsamples[i] = unfoldsample(decodedfoldedsamples[i], predictedsample_r);
// System.out.println("predicteddebiased_r:" + predicteddebiased_r + "decoderbiasestimate_r" +
// decoderbiasestimate_r + "\n");
// System.out.println("Decoded folded sample value:" + decodedfoldedsamples[i] +
// "predictedsample_r" + predictedsample_r + "\n");
// System.out.println("Sample: " + i + "Decoded unfolded samples:" + decodedunfoldedsamples[i]
// + "\n");
packetdebiasedsamples[i] =
decodedunfoldedsamples[i] - ((decoderbiasestimate_r + almosthalf) >> denomexponent);
/* update weight vector if we have sufficient samples in the packet */
if (i >= order) {
err_r = predicteddebiased_r - (packetdebiasedsamples[i] << denomexponent);
if (err_r < 0)
for (j = 1; j <= order; j++)
weight_r[j - 1] +=
((packetdebiasedsamples[i - j] << denomexponent) + halfmu) >> muexponent;
else
for (j = 1; j <= order; j++)
weight_r[j - 1] -=
((packetdebiasedsamples[i - j] << denomexponent) + halfmu) >> muexponent;
}
/* update bias estimate */
decoderbiasestimate_r -=
(decoderbiasestimate_r
- (decodedunfoldedsamples[i] << denomexponent)
+ biasscalealmosthalf)
>> biasscalebits;
/* At this point, decodedsample is our decoded sample value and the prediction information has been updated to decode the next sample. */
}
write_Byte_array(
Msg_head,
packetbytes_length,
numdecodedsamples,
source); // judge whether the generated array is contained in one packet.
/*int arr_num = (numdecodedsamples / 28)+1;
for (int k=0;k<arr_num-1 ;k++ )
{
decodepacketbitpointer = 0;
decodepacketbytepointer = 28;
for (int i=0;i<28 ;i++ )
{
System.out.println("***Samples decompressed from each packet K : " + k + " | " + readint(16,destination[k]) + "\n");
}
}
if ((numdecodedsamples % 28) != 0)
{
decodepacketbitpointer = 0;
decodepacketbytepointer = 28;
for (int k=0;k< numdecodedsamples % 28 ;k++ )
{
System.out.println("***Samples decompressed from each packet : " + (numdecodedsamples % 28) + " | "+ readint(16,destination_last_row) + "\n");
}
}
*/
return numdecodedsamples;
}
