java Blackberry multimedia is distorted when download resumes
Hello, I'm developing a blackberry app and I'M having a problem while recovery of a download. The code works well if the download is not interrupted, but if it is interrupted and the download is restarted, the media file is distorted.
To allow the resumption of the download, I request the file into segments from the server and persist the last piece of downloaded/written correctly. So if I have to restart the download, I check the last song downloaded and written, increment and to determine the scale at the request of the server.
My code is listed below... :
public final class Downloader extends Thread {
private String remoteName;
private String localName;
private String parentDir;
private String dirName;
public String fileName;
private int chunkSize = 512000;
public boolean completed = false;
public boolean failed = false;
public CacheObject cacheObject = null
public Downloader(String remoteName, String localName, String musicTitle, String parentDir, String dirName) {
this.remoteName = remoteName;
this.parentDir = parentDir;
this.dirName = dirName;
this.localName = localName;
this.secureDownload = false;
this.musicTitle = musicTitle;
this.cacheObject = CachedObject.getInstance().findCachedObject(musicTitle);
if (this.cacheObject == null) // create new object
this.cacheObject = new CachedObject(musicTitle, remoteName);
this.thisObj = this;
}
public void run() {
downloadFile(localName);
}
public void downloadFile(String fileName) {
try {
int chunkIndex = 0; int totalSize = 0;
String tempFileName = "file:///" + FileConnect.getInstance().FILE_ROOT+parentDir+ FileConnect.getInstance().FILE_SEPARATOR;
if (!FileConnect.getInstance().fileExists(tempFileName))
FileConnect.getInstance().createDirectory(parentDir);
if (dirName != null) {
tempFileName = "file:///" + FileConnect.getInstance().FILE_ROOT+ parentDir + "/" + dirName + FileConnect.getInstance().FILE_SEPARATOR;
if (!FileConnect.getInstance().fileExists(tempFileName))
FileConnect.getInstance().createDirectory(parentDir + "/" + dirName);
}
fileName = tempFileName + fileName;
this.fileName = fileName;
file = (FileConnection) Connector.open(fileName, Connector.READ_WRITE);
if (!file.exists()) {
file.create();
}
if(cacheObject.file_path.length() < 1)
cacheObject.file_path = fileName;
file.setWritable(true);
// Trying to check the file size.
long fSize = (int)file.fileSize();
// If it is greater than 1 byte, then we open an output stream at the end of the file
if(fSize > 1){
out = file.openOutputStream((fSize+1));
}
else{
out = file.openOutputStream();
}
int rangeStart = 0; int rangeEnd = 0;
// Want to know the total fileSize on server (used for updating the UI..
HttpConnection conn2;
conn2 = (HttpConnection) Util.getHttpConnection(remoteName);
String totalFileSize = "" + conn2.getLength();
conn2.close();
//Number of chunks
int numChunks = (int) Math.ceil( Integer.parseInt(totalFileSize) / chunkSize);
cacheObject.chunk_size = numChunks;
// Set the total file size..
content_length = Integer.parseInt(totalFileSize);
fileSize = 0;
String url = remoteName + HttpRequestDispatcher.getConnectionString();
if(cacheObject.last_successfully_downloaded_chunk > -1){
//This is a resume..
if( (cacheObject.last_successfully_downloaded_chunk + 1) < numChunks ){
chunkIndex = cacheObject.last_successfully_downloaded_chunk + 1;
fileSize = cacheObject.curr_download_size;
}
}
while (file != null) {
try{
conn = (HttpConnection)Connector.open(url);
if(chunkIndex < (numChunks-2)){
rangeStart = chunkIndex * chunkSize; rangeEnd = rangeStart + chunkSize - 1;
}
else{
rangeStart = chunkIndex * chunkSize;
int remainingBytes = Integer.parseInt(totalFileSize) - rangeStart; rangeEnd = rangeStart + (remainingBytes - 1);
}
conn.setRequestProperty("User-Agent", "Profile/MIDP-2.0 Configuration/CLDC-1.0");
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Range", "bytes=" + rangeStart + "-" + rangeEnd);
responseCode = conn.getResponseCode();
if (responseCode != 200 && responseCode != 206) {
out.flush(); out.close(); file.close(); in.close(); conn.close();
in = null; conn = null; file = null; out = null;
Thread.yield(); break;
}
else{
in = conn.openInputStream(); int length = -1;
byte[] readBlock = new byte[256];
while ((length = in.read(readBlock)) != -1) {
out.write(readBlock, 0, length);
fileSize += length;
cacheObject.curr_download_size = fileSize;
}
totalSize += fileSize;
in.close(); conn.close(); in = null; conn = null;
// Update after the byte read..
cacheMusicbox.last_successfully_downloaded_chunk = chunkIndex;
CachedObject.getInstance().saveCachedObject( cacheObject);
System.out.println("Last successful chunk downloaded: " + cacheObject.last_successfully_downloaded_chunk);
chunkIndex++;
if(chunkIndex == numChunks){
out.flush(); out.close(); file.close(); break;
}
Thread.yield();
}
}
// Network error related
catch(Exception e){
System.out.println("Download failed. Some kind of error - " + e.getMessage());
System.out.println("fileSize b4 closed: ." + file.fileSize());
System.out.println("Last successful chunk downloaded: " + cacheMusicbox.last_successfully_downloaded_chunk);
if (out != null) {
out.flush(); out.close();
System.out.println("We just closed the outputStream");
System.out.println("fileSize when closed: ." + file.fileSize());
}
if (file != null && file.exists()) {
if (file.isOpen()) {
file.close();
}
}
in = null; conn = null; file = null; out = null;
failed = true;
System.out.println("Ensuring this block is called " + cacheObject.last_successfully_downloaded_chunk);
break;
}
}
System.out.println("Full file downloaded: " + totalSize + " Bytes");
System.out.println("Wrote file to local storage");
Thread.sleep(3000);
if(!failed)
completed = true;
}
// any other error...
catch (Exception e) {
System.out.println(e.getMessage());
try{
out.flush(); out.close(); file.close();
in = null; conn = null; file = null; out = null;
}
catch(Exception ee){
System.out.println("While closing catch that belongs to the top guy: " + ee.getMessage());
}
failed = true;
}
}
}
I don't know where I am doing wrong. Help, please
Finally this sorted out. What had happened was if the link turns off and I close the output stream, the calculation is distorted.
So the next time I want to continue with the download, I'll open a stream of output at the end of the file and start asking the file to the server from the file size, for example, if the file size is 500 kb (already downloaded b4 network connection went wrong) then I'll start asking to between 500 - (500 + chunkSize) until the end of the file
Tags: BlackBerry Developers
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