Ideas on transforming a byte array?
I'm writing a program to compress files - I read it in, transform it and then write it out again. I'm just having a little confusion with the transforming.
I'm keeping it as basic as possible and just starting with finding and replacing repeating bytes with an instruction of how many times the following byte is repeated. ie a a a a a = 5 a _ _ _
In order to do this I create a temporary array to write to (initialised to the same size as the input) and then check through for repetitions. If something is repeated more than twice (3+), then a marker byte is put in (I wanted to have specific ones for however many times the byte is repeated - within reason - which is the switch statement below), the next byte is the byte to be repeated and then I want to jump forward to the next different byte.
I then go through the temp array count the repetitions, create a new smaller byte array and write temp[] to output[] ignoring the bytes that are repeated.
This is what I have so far, but it doesn't quite do what I want:
public class Transformer {
byte[] input;
byte[] temp;
byte[] output;
byte rep;
public Transformer() {
public byte[] transform(byte[] in) {
input = in;
temp = new byte[in.length];
output = new byte[count(input, temp)];
output = compress(temp, output);
return output;
private int count(byte[] from, byte[] to) {
int k = 0; // total bytes copied so far
byte markerByte = (byte) 0xE1;
for (int i = 0, j = 0; i < from.length; i = j) {
for (j = i+1; j < from.length && from[j] == from[i] && j-i < 128; j++);
if (j-i >= 3) {
to[k++] = markerByte;
to[k++] = (byte) (j-i);
to[k++] = from[j-1];
} else {
to[k] = from[k];
k = i+1;
return k;
// (the following method isn't finished)
private byte[] compress(byte[] from, byte[] to) {
for (int i = 0; i < from.length; i++) {
if (from[i] == (byte) 0xE1) {
System.out.println("repeat");
System.out.println(from);
return to;
private byte getRepeatByte(int numberOfRepeats) {
byte instruction;
switch (numberOfRepeats) {
case 1: instruction = (byte) 0xE1; break;
case 2: instruction = (byte) 0xE2; break;
case 3: instruction = (byte) 0xE3; break;
case 4: instruction = (byte) 0xE4; break;
case 5: instruction = (byte) 0xE5; break;
case 6: instruction = (byte) 0xE6; break;
case 7: instruction = (byte) 0xE7; break;
case 8: instruction = (byte) 0xE8; break;
case 9: instruction = (byte) 0xE9; break;
case 10: instruction = (byte) 0xEA; break;
case 11: instruction = (byte) 0xEB; break;
case 12: instruction = (byte) 0xEC; break;
case 13: instruction = (byte) 0xED; break;
case 14: instruction = (byte) 0xEE; break;
case 15: instruction = (byte) 0xEF; break;
default: instruction = (byte) 0xE0; break;
return instruction;
At the moment I'm using a marker byte in the transform() but I want to be using the switch statement to work out the right byte to put in first.
Does anyone have any advice on if I'm doing this in a ridiculous way or if my methods won't work.. As I haven't written a decompressor yet, it's pretty hard to test!
baftos - thank you for your advice, i will try that and see how it goes.
Jos - it is your method and thank you very much for it! It's part of an ongoing project of mine, which is turning out to be more challenging than i originally thought - when i posted on the other forum your loop did perfectly what I was trying to do at the time. I need all the advice i can get and hence post on multiple forums.
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HFZ
Attachments:
DataFlowWR.JPG 159 KB
Datalogfile.JPG 386 KB -
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public void setBarChart(byte barchart[]){
this.barchart = barchart;
public void set3DChart(byte chart3D[]){
this.chart3D = chart3D;
}ControllerServlet.java:
=================
(This could also be an ActionClass(Ref Struts) a Backing Bean(Ref JSF) or anything which stays at the Controller Layer)
public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{
/* There are few different implementations of getting BeanFactory Resource
In,the below example i have used XmlBeanFactory Object to create an instance of (Spring) BeanFactory */
BeanFactory factory =
new XmlBeanFactory(new FileInputStream("SpringResource.xml"));
//write a Util Logic in your Implementation class using JFreeChart (or some open source chart library) and express the images by returning a byte[]
ChartService chartService =
(GreetingService) factory.getBean("chartService");
ViewBean vb = new ViewBean();
vb.setPieChart(chartService.generatePieChart(request.getParameter("<someparam>"));
vb.setBarChart(chartService.generateBarChart(request.getParameter("<someparam1>"));
vb.set3DChart(chartService.generate3DChart(request.getParameter("<someparam2>"));
chartService = null;
HttpSession session = request.getSession(false);
session.setAttribute("ViewBean",vb);
response.sendRedirect("jsp/DisplayReports.jsp");
}DisplayReports.jsp :
================
<%@ page language="java" %>
<html>
<head>
<title>reports</title>
</head>
<body>
<h1 align="center">Pie Chart </h1>
<center><img src="ImageServlet?req=1" /></center>
<h1 align="center">Bar Chart </h1>
<center><img src="ImageServlet?req=2" /></center>
<h1 align="center">3D Chart</h1>
<center><img src="ImageServlet?req=3" /></center>
</body>
</html>ImageServlet.java
==============
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
byte buffer[];
HttpSession session = request.getSession(false);
ViewBean vb = (ViewBean) session.getAttribute("ViewBean");
String req = request.getParameter("req");
if(req.equals("1") == true)
buffer = vb.getPieChart();
else if(req.equals("2") == true)
buffer = vb.getBarChart();
else if(req.equals("3") == true)
buffer = vb.get3DChart();
JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(new ByteArrayInputStream(buffer));
BufferedImage image =decoder.decodeAsBufferedImage() ;
response.setContentType("image/jpeg");
// Send back image
ServletOutputStream sos = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
encoder.encode(image);
}Note: Through ImageServlet is a Servlet i would categorise it under presentation layer rather to be a part of Controller and added to it all this could be easily relaced by a reporting(BI) server like JasperServer,Pentaho,Actuate................
Hope the stated implementation had given some idea to you....
However,If you want to further look into similar implementations take a look at
http://www.swiftchart.com/exampleapp.htm#e5
which i believe to be a wonderful tutor for such implementations...
However, there are many simple (Open) solutions to the stated problem.. if you are Using MyFaces along with spring... i would recommend usage of JSF Chart Tag which is very simple to use all it requires need is to write a chart Object generating methos inside our backing bean.
For further reference have a look at the below links
http://www.jroller.com/page/cagataycivici?entry=acegi_jsf_components_hit_the
http://jsf-comp.sourceforge.net/components/chartcreator/index.html
NOTE:I've tried it personally using MyFaces it was working gr8 but i had a hardtime on deploying my appln on a Portal Server(Liferay).If you find a workaround i'd be glad to know about it.
& there are many BI Open Source Server Appls that can take care of this work too.(Maintainace wud be a tough ask when we go for this)
For, the design perspective had i've been ur PM i wud have choose BI Server if it was corporate web appln on which we work on.
Hope this might be of some help :)
REGARDS,
RaHuL -
Display byte array image or ole object in Section through dynamic code?
To Start I am a Complete Newbe to Crystal Reports. I have taken over a project originally written in VS2003 asp.net using SQL Server 2005 and older version of Crytal Reports. I have moved project to VS2010 and Cryatal Reports 10 still using SQL Server 2005. Have multiple reports (14 to be exact) that display data currently being pulled from database suing a dataset, each report has from 4 to 14 Sections. I have modified database table with two new fields. Field1 contains string data with full path to a scanned document (pdf or jpeg). Field2 holds a byte array of the actual image of the scanned document. I have tested the database and it does infact contain the byte array and can display the image via VB.net code. I can make the report display the scanned image using ole object.
Now my real question: I need to add a new Section and it should display either the byte array of the scanned image or the actual scanned image (pdf or jpeg) . How can I have it do either of these options via code dynamicly while application is running?First; only CRVS2010 is supported on VS2010. You can download CRVS2010 from here;
SAP Crystal Reports, developer version for Microsoft Visual Studio: Updates & Runtime Downloads
Developer Help files are here:
Report Application Server .NET API Guide http://help.sap.com/businessobject/product_guides/sapCRVS2010/en/xi4_rassdk_net_api_en.zip
Report Application Server .NET SDK Developer Guide http://help.sap.com/businessobject/product_guides/sapCRVS2010/en/xi4_rassdk_net_dg_en.zip
SAP Crystal Reports .NET API Guide http://help.sap.com/businessobject/product_guides/sapCRVS2010/en/crnet_api_2010_en.zip
SAP Crystal Reports .NET SDK Developer Guide http://help.sap.com/businessobject/product_guides/sapCRVS2010/en/crnet_dg_2010_en.zip
To add the images, you have a number of options re. how to. You even have two SDKs that y ou can use (RAS and CR).
Perhaps the best place to start is with KB [1296803 - How to add an image to a report using the Crystal Reports .NET InProc RAS SDK|http://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes_boj/sdn_oss_boj_bi/sap(bD1lbiZjPTAwMQ==)/bc/bsp/spn/scn_bosap/notes%7B6163636573733d36393736354636443646363436353344333933393338323636393736354637333631373036453646373436353733354636453735364436323635373233443330333033303331333233393336333833303333%7D.do]. The KB describes how to add images to a report using the InProc RAS SDK, but also references other KBs that use CR SDK.
Also, don't forget to use the search box in the top right corner of this web page.
Ludek
Follow us on Twitter http://twitter.com/SAPCRNetSup
Got Enhancement ideas? Try the [SAP Idea Place|https://ideas.sap.com/community/products_and_solutions/crystalreports] -
Byte array to base64encoder problem, cannot encode a 7.7 MB file
hey guys, so ive been trying to use the base64encoder to encode a bytearray which is then sent thru a webservice to the server to be decoded.
and as the subject of this post suggests, i have been having problems encoding a big file,
forexample i tried to upload/convert a 84KB image and it worked just fine... the trace of the string ended with a "==" which i believe means that the conversion is complete...
but when i try to upload a 7.7MB image, it is, i guess, crashing... i dont see any "==" in the string... so i guess its not working... i was wondering if there is any any type of file size limit or soemthign for the encoding...
the code i have is
import flash.events.Event;
import flash.net.FileFilter;
import flash.net.FileReference;
import flash.utils.ByteArray;
import mx.collections.ArrayCollection;
import mx.controls.Alert;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
import mx.utils.Base64Encoder;
import services.images.ImageData;
import services.images.Images;
import services.images.ReturnMessage;
// ActionScript file
public var fileRef:FileReference = new FileReference();
public var imgCollection:ArrayCollection = new ArrayCollection();
public var imgService:Images = new Images();
public var imageData:ImageData = new ImageData();
public var returnMsg:ReturnMessage = new ReturnMessage();
public function onBrowseButtonClicked(event:MouseEvent):void{
var arr:Array = [];
arr.push(new FileFilter("Images", ".gif;*.jepg;*.jpg;*.png"));
fileRef.browse(arr);
fileRef.addEventListener(Event.SELECT, fileRef_select);
fileRef.addEventListener(Event.COMPLETE, fileRef_complete);
public function fileRef_select(event:Event):void{
fileRef.load();
public function fileRef_complete(event:Event):void{
img.source = fileRef.data;
var fileByteArr:ByteArray = fileRef.data;
var b64En:Base64Encoder = new Base64Encoder();
b64En.encodeBytes(fileByteArr); //<----------------------------------------------------------
var str:String = b64En.flush(); //<----------------------------------------------------------
trace(str.length);
b64En.reset();
trace("------------------------------------ " + str + " -----------------------------");
imageData.Base64EncodedImage = str;
imageData.FileName = "nameofstring";
imgService.UploadImage(imageData);
imgService.addEventListener(FaultEvent.FAULT, servFault);
imgService.addEventListener(ResultEvent.RESULT, imgServSuccess);
public function imgServSuccess(event:ResultEvent):void{
Alert.show("i am in the result");
returnMsg = event.result as ReturnMessage;
var resultStr:String = event.result as String;
Alert.show(resultStr);
if(returnMsg.ThereWasAnError){
trace(returnMsg.ErrorMessages.getItemAt(0).toString());
public function servFault(event:FaultEvent):void{
Alert.show("2 " + event.fault.message);
Alert.show("3 " + event.fault.faultCode);
any help will be greatly appretiated!! thanks in advace!yeah i did actually... except i think i changed a LOT of code since i last posted this article...
so i dont remember where this code is exactly... lol
i have the following code now...
hope this helps
i use a a lot of webservices... so there is some of that code included in there aswell...
* This file will do the file upload. It has been suggested to me multiple times, that using a queueing system for
* file upload is not a good idea. Instead I declared a counter and used the final function to fire the next item
* in the array. this also makes canceling a routine easier.
import flash.events.Event;
import flash.events.ProgressEvent;
import flash.net.FileReference;
import flash.net.FileReferenceList;
import flash.utils.ByteArray;
import mx.collections.ArrayCollection;
import mx.controls.*;
import mx.managers.*;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
import mx.utils.Base64Decoder;
import mx.utils.Base64Encoder;
import services.images.Images;
import valueObjects.*;
public var t:Number = 0;
public var fileRef:FileReferenceList = new FileReferenceList();
public var listCacheFiles:Array = new Array();
[Bindable] public var fileListArr:Array = new Array();
[Bindable] public var fileNames:ArrayCollection = new ArrayCollection();
[Bindable] public var arrUploadFiles:Array = new Array();
public var file:FileReference;
public var _numCurrentUpload:Number = 0;
public var imageData:valueObjects.ImageData;
public var imageService:Images = new Images();
public var saveImages:Images;
public var returnMsg:ReturnMessage = new ReturnMessage();
public var dataToSave:ImageData;
public var myCounter:int = 0;
public var numPerc:Number;
/*vars to possible delete*/
public var fileListx:ArrayCollection;
* Initiates the browse, when files are selected the selectionHandler function is called
public function initiateBrowse():void{
var filter:Array = [];
filter.push(new FileFilter("Images", ".gif;*.jepg;*.jpg;*.png"));
fileRef.addEventListener(Event.SELECT, selectionHandler);
fileRef.browse(filter);
* selection handler takes the selected files and puts them in 2 different arrays
* fileListArr contains all the file information like the image itself and the name and everything
* fileNames contains the information essential to populate the datagrid in the cropper.mxml
public function selectionHandler(event:Event):void{
//trace("selection Handler ->>");
fileRef.removeEventListener(Event.SELECT, selectionHandler);
var numSelected:int = event.target.fileList.length;
var fileList:Array = event.target.fileList;
fileListx = new ArrayCollection();
fileListx = event.target.fileList as ArrayCollection;
//var oldListLength:Number = fileListArr.length;
for each(var item:Object in fileList){
fileListArr.push(item);
fileNames.addItem({
num: fileNames.length + 1,
name: item.name,
size: formatFileSize(item.size),
status: "",
itemDetails: item
var newListLength:Number = fileListArr.length;
if(myCounter > 0)
loopList(myCounter);
else
loopList(0);
* this function starts one, new filereference for each files in the array
public function loopList(value:int):void{
//trace("looplist -->");
if(value < fileListArr.length){
_numCurrentUpload = value;
file = new FileReference();
file = FileReference(fileListArr[value]);;
file.addEventListener(Event.COMPLETE, loadImage);
file.addEventListener(ProgressEvent.PROGRESS, fileProgress);
file.load();
* This function will convert the byte array into a string, and then it sends it to the server.
public function loadImage(event:Event):void{
trace("loadImage -->");
file.removeEventListener(Event.COMPLETE, loadImage);
myCounter += 1;
var fileByteArr:ByteArray = event.target.data;
var b64En:Base64Encoder = new Base64Encoder();
b64En.encodeBytes(fileByteArr);
var str:String = b64En.flush();
imageData = new ImageData();
imageData.Base64EncodedImage = str;
imageData.FileName = event.target.name;
trace("sending -->> " + imageData.FileName);
updateStatus("Sending to server");
imageService.addEventListener(ResultEvent.RESULT, imgServSuccess);
imageService.UploadImage(imageData);
b64En.reset();
* This function will decode the information recieved back from the server.
public function imgServSuccess(event:ResultEvent):void{
trace("imgServSuccess -->");
imageService.removeEventListener(ResultEvent.RESULT, imgServSuccess);
var returnedImageId:ArrayCollection = new ArrayCollection();
returnMsg = event.result as ReturnMessage;
var returnedData:Object = event.result.Images;
var imgD:ImageData = new ImageData();
if(returnMsg.ThereWasAnError){
trace(returnMsg.ErrorMessages.getItemAt(0).toString());
else{
for each(var imgData:ImageData in returnedData){
var decoded:Base64Decoder = new Base64Decoder();
decoded.decode(imgData.Base64EncodedImage);
var byteArr:ByteArray = decoded.toByteArray();
//img.source = byteArr;
dataToSave = new ImageData();
dataToSave = returnedData[0];
listCacheFiles.push(dataToSave);
updateStatus("Item in Cache");
//uploadDetails.visible = true;
loopList(myCounter);
public var win:itemDetails;
public function itemClicking(event:Event):void{
var fileName:String = event.currentTarget.dataProvider[0].name;
for(var i:Number = 0; i < listCacheFiles.length; i++){
//var temp:ImageData = event.target as ImageData;
win = null;
win = itemDetails(PopUpManager.createPopUp(this, itemDetails, true));
win.title = "Enter Details";
PopUpManager.centerPopUp(win);
win["save"].addEventListener("click", popupClosed);
public function popupClosed(event:Event):void{
var returnedData:ImageData = new ImageData;
returnedData = win.dataToSave;
saveImgAndData(returnedData);
public function saveImgAndData(data:ImageData):void{
saveImages = new Images;
saveImages.showBusyCursor = true;
saveImages.addEventListener(ResultEvent.RESULT, savedSuccess);
saveImages.addEventListener(FaultEvent.FAULT, faultFunc);
saveImages.SaveUploadedImageInformation(data);
public function faultFunc(event:FaultEvent):void{
Alert.show(event.fault.message);
Alert.show(event.fault.faultString);
public function savedSuccess(event:ResultEvent):void{
//trace("savedSuccess -->");
var retMsg:Object = event.result.Images;
//trace("saving -->> " + retMsg[0].FileName);
updateStatus("Completed");
//loopList(myCounter);
private function formatFileSize(numSize:Number):String {
var strReturn:String;
numSize = Number(numSize / 1024);
strReturn = String(numSize.toFixed(1) + " KB");
if (numSize > 1024) {
numSize = numSize / 1024;
strReturn = String(numSize.toFixed(1) + " MB");
if (numSize > 1024) {
numSize = numSize / 1024;
strReturn = String(numSize.toFixed(1) + " GB");
return strReturn;
public function removeFiles():void{
var arrSelected:Array = displayFilesList.selectedIndices;
if(arrSelected.length >= 1){
for(var i:Number = 0; i < arrSelected.length; i++){
fileNames[Number(arrSelected[i])] = null;
var idx:int = 1;
for(var j:Number = 0; j < fileNames.length; j++){
if(fileNames[j] == null){
fileNames.removeItemAt(j);
j--;
}else{
fileNames[j].num = idx++;
if(fileNames.length > 0)
displayFilesList.selectedIndex = 0;
else
displayFilesList.selectedIndex = -1;
_numCurrentUpload--;
updateProgBar();
private function updateStatus(status:String, index:Number = -1):void{
index = _numCurrentUpload;
fileNames[index].status = status;
displayFilesList.invalidateList();
public function fileProgress(event:ProgressEvent):void{
//trace("fileProgress -->");
var numPerc:Number = Math.round((Number(event.bytesLoaded) / Number(event.bytesTotal)) * 100);
updateStatus("Uploading: " + numPerc.toString() + "%");
updateProgBar(numPerc);
var evt:ProgressEvent = new ProgressEvent("uploadProgress", false, false, event.bytesLoaded, event.bytesTotal);
dispatchEvent(evt);
public function updateProgBar(numPerc:Number = 0):void{
//trace("updateProgBar -->");
var strLabel:String = (_numCurrentUpload + 1) + "/" + fileNames.length;
progBar.label = strLabel;
progBar.setProgress(_numCurrentUpload + numPerc / 100, fileNames.length);
progBar.validateNow(); -
Byte array exception in web dynpro
Hi all,
I am developing a web dynpro application using a webservice model. The model expects a parameter in the form a byte array.
But unfortunately when I get the following exception when i lauch the web dypro application. Anyone of you, plz help me.
Error stack trace:
com.sap.tc.webdynpro.services.exceptions.WDTypeNotFoundException: type java:byte not found
at com.sap.tc.webdynpro.services.datatypes.core.DataTypeBroker.getDataType(DataTypeBroker.java:216)
at com.sap.tc.webdynpro.progmodel.context.AttributeInfo.init(AttributeInfo.java:449)
at com.sap.tc.webdynpro.progmodel.context.NodeInfo.initAttributes(NodeInfo.java:688)
at com.sap.tc.webdynpro.progmodel.context.NodeInfo.init(NodeInfo.java:673)
at com.sap.tc.webdynpro.progmodel.context.NodeInfo.init(NodeInfo.java:678)
at com.sap.tc.webdynpro.progmodel.context.NodeInfo.init(NodeInfo.java:678)
at com.sap.tc.webdynpro.progmodel.context.Context.init(Context.java:38)
at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:199)
at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.init(ClientComponent.java:346)
at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.init(ClientApplication.java:342)
at com.sap.tc.webdynpro.clientserver.task.Task.createApplication(Task.java:217)
at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:494)
at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:54)
at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:241)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:139)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:101)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:38)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:377)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:257)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:322)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:300)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:699)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:224)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:147)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:140)
Thanks in Advance
SatishHi VS,
I think I haven't explained it clearly.
I have used the file upload component to get the data from a file.. and of course with a context attribute of binary type. I have to assign this byte[] to the web service model method parameter. But to my fascination, the webdynpro application crashes on start throwing the above mentioned exception.
Any Idea??
thanks
satish -
Method to create Player directly from the mp3 bytes array
I was checking JMF and didn't find any method to play a mp3 informing its byte array
Wouldn't it be an interesting method ? Ok, URL is much easier, but I am talking about ID3 files that has sequences of mp3 chuncks in the same file... Anyone knows a way to build a Player from mp3' array of bytes ???sergio_abreu wrote:
Err, Sorry but I desagree.I expected as much
It seems you didn't understand my question well.Quite possibly
I think the form I wrote was confusing:
In +"Anyone knows a way to build a Player from mp3' array of bytes ???+"
I meant: Anyone knows a way to create a Player or MediaPlayer CLASS from DYNAMIC mp3' array of bytes ???That's even less coherent, to be honest
Have you seen the structure of an ID3 music file (album) ? It's a collection of mp3 chuncks in only one file.ID3 is simply metadata about a work. It is not "chunks of MP3"
I have already designed a ID3 class (I called "ID3Info" ) in Java that extracts/shows (dump) all the mp3 from the ID3 file.ID3 isn't a file format. Nor can you extract an MP3 from it
The thing I would need now is to have some methods in Manager Class from which I could choose which bytes of a generic file I want to load as an mp3 song, that's all.This makes zero sense. Like saying "I need a kettle which will turn furniture into weather"
It would be nice if there were 2 new different methods:
1) Player createRealizedPlayer( byte[] songBytes, String fileExtension);
Arguments: the song byte array and the extension, ex. "mp3"And what would this method do? Where does the byte[] come from? What is in the file, that you also need in order to play the song? How is this - assuming it's possible - easier, better, than just playing the file?
2) Player createRealizedPlayer( java.net.URL genericFileURL, int beginPosition, int endPosition, String fileExtension);
Arguments: the URL of a file containing varios mp3 chuncks and the begin / end of the bytes to be loaded as a song and a String to describe the type of file ("mp3" for example)See above
PS: If you find it interesting, I am willing to contribute to enrich even more the Java Media framework. If you think my ideas are not valid, I just ask someone to send me the jmf source code so that I can alter some classes for my tests only.Why do you need JMF source code? I don't think this magical upside-down-ness is going to enhance anything, to be honest
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