Develop Reference

com.googlecode.mp4parser fails for mp3 audio file?

I am using the com.googlecode.mp4parser library to merge audio files. I have an external audio mp3 file which I store in raw resources. This file fails to merge due to following exception, Below is my code :
Reading a file from raw folder :
InputStream is = context.getResources().openRawResource(R.raw.my_mp3_file);
OutputStream output = null;
try {
File file = new File(context.getFilesDir(), "silence.mp3");
if(!file.exists()) {
file.createNewFile();
}
output = new FileOutputStream(file);
byte[] buffer = new byte[4 * 1024]; // or other buffer size
int read;
while ((read = is.read(buffer)) != -1) {
output.write(buffer, 0, read);
}
output.flush();
output.close();
fileReference= file;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace(); // handle exception, define IOException and others
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
Code that reads movie ( Which is failing ) :
if(fileReference.exists()) {
Movie m = new MovieCreator().build(fileReference.getAbsolutePath());
}
While getting this Movie m my code fails throwing the exception :
java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List com.coremedia.iso.boxes.MovieBox.getBoxes(java.lang.Class)' on a null object reference
It works for some mp3 files fails for raw resource files ? What's wrong here ?

Here are my conclusion and solution after a lot of research
MP4Parser for merging audio and video only use .m4a extension
String root = Environment.getExternalStorageDirectory().toString();
String audio = root + "/" + "tests.m4a";
String video = root + "/" + "output.mp4";
String output = root + "/" + "aud_vid.mp4";
mux(video, audio, output);
and here is the method
public boolean mux(String videoFile, String audioFile, String outputFile) {
Movie video;
try {
video = new MovieCreator().build(videoFile);
} catch (RuntimeException e) {
e.printStackTrace();
return false;
} catch (IOException e) {
e.printStackTrace();
return false;
}
Movie audio;
try {
audio = new MovieCreator().build(audioFile);
} catch (IOException e) {
e.printStackTrace();
return false;
} catch (NullPointerException e) {
e.printStackTrace();
return false;
}
Track audioTrack = audio.getTracks().get(0);
video.addTrack(audioTrack);
Container out = new DefaultMp4Builder().build(video);
FileOutputStream fos;
try {
fos = new FileOutputStream(outputFile);
} catch (FileNotFoundException e) {
e.printStackTrace();
return false;
}
BufferedWritableFileByteChannel byteBufferByteChannel = new BufferedWritableFileByteChannel(fos);
try {
out.writeContainer(byteBufferByteChannel);
byteBufferByteChannel.close();
fos.close();
} catch (IOException e) {
e.printStackTrace();
return false;
}
return true;
}
private static class BufferedWritableFileByteChannel implements WritableByteChannel {
private static final int BUFFER_CAPACITY = 1000000;
private boolean isOpen = true;
private final OutputStream outputStream;
private final ByteBuffer byteBuffer;
private final byte[] rawBuffer = new byte[BUFFER_CAPACITY];
private BufferedWritableFileByteChannel(OutputStream outputStream) {
this.outputStream = outputStream;
this.byteBuffer = ByteBuffer.wrap(rawBuffer);
}
#Override
public int write(ByteBuffer inputBuffer) throws IOException {
int inputBytes = inputBuffer.remaining();
if (inputBytes > byteBuffer.remaining()) {
dumpToFile();
byteBuffer.clear();
if (inputBytes > byteBuffer.remaining()) {
throw new BufferOverflowException();
}
}
byteBuffer.put(inputBuffer);
return inputBytes;
}
#Override
public boolean isOpen() {
return isOpen;
}
#Override
public void close() throws IOException {
dumpToFile();
isOpen = false;
}
private void dumpToFile() {
try {
outputStream.write(rawBuffer, 0, byteBuffer.position());
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}

Seem like this issue happens because Google devs have forgotten to handle that NullPointerException case. After several hours diving into the code base, I finally found the solution and It works very fine, you can try this:
Movie movie;
try{
movie = MovieCreator.build(videoPath);
}catch(NullPointerException e){
Log.d("AsyncTask", "Catch null getMovieBoxes");
FileDataSourceImpl fileDataSource = new FileDataSourceImpl(new File(videoPath));
IsoFile isoFile = new IsoFile(fileDataSource);
List<TrackBox> trackBoxes = isoFile.getBoxes(TrackBox.class);
for (TrackBox trackBox : trackBoxes) {
SchemeTypeBox schm = Path.getPath(trackBox, "mdia[0]/minf[0]/stbl[0]/stsd[0]/enc.[0]/sinf[0]/schm[0]");
if (schm != null && (schm.getSchemeType().equals("cenc") || schm.getSchemeType().equals("cbc1"))) {
movie.addTrack(new CencMp4TrackImplImpl(fileDataSource.toString() + "[" + trackBox.getTrackHeaderBox().getTrackId() + "]", trackBox));
} else {
movie.addTrack(new Mp4TrackImpl(fileDataSource.toString() + "[" + trackBox.getTrackHeaderBox().getTrackId() + "]" , trackBox));
}
}
}

okhttp not downloading the file

I am using okhttp for downloading video from server. there is no error no exception but the file is not downloading every where but it seems as it is.
Here is the code:
OkHttpClient httpClient = new OkHttpClient();
Call call = httpClient.newCall(new Request.Builder().url("http://res.cloudinary.com/demo/video/upload/v1427018743/ygzxwxmflekucvqcrb8c.mp4").get().build());
try {
File file = new File(getCacheDir(), user_Videos.get(i).video_title+ ".mp4");
OutputStream out = new FileOutputStream(file);
Response response = call.execute();
if (response.code() == 200) {
InputStream inputStream = null;
try {
inputStream = response.body().byteStream();
byte[] buff = new byte[1024 * 8];
long downloaded = 0;
long target = response.body().contentLength();
publishProgress(0L, target);
while (true) {
int readed = inputStream.read(buff);
if (readed == -1) {
break;
}
//write buff
downloaded += readed;
try {
out.write(buff,0,readed);
} catch (Exception e) {
e.printStackTrace();
}
publishProgress(downloaded, target);
if (isCancelled()) {
return false;
}
}
return downloaded == target;
} catch (IOException ignore) {
return false;
} finally {
if (inputStream != null) {
out.flush();
out.close();
inputStream.close();
}
}
} else {
return false;
}
} catch (IOException e) {
e.printStackTrace();
return false;
}
The progress is showing correctly but video is not showing in directory.
Thanks.

So there is no problem in my code but the path. Thanks #greenapps who made me think about path/ directory.
Basically I just change the path to a real one instead of cache and yup here is the video.
Changed this line
File file = new File(getCacheDir(), user_Videos.get(i).video_title + ".mp4");
to this
File file = new File(Environment.getExternalStorageDirectory(), user_Videos.get(i).video_title+ ".mp4");
Thanks #greenapps for the clue.

Android Core API Download File

I am trying firstly to download the file and its content from Dropbox in Android app using Dropbox Core API but when i execute the following code the app crushes.
EDIT: I have used two functions downloadDropboxFile and copy functions. The problem is that i am getting blank data when i read the local file which is supposed to contain the dropbox file data.
Here is the code where i call the function
downloadDropboxFile("/userandpass.txt");
if (mDBApi.getSession().isLinked())
{
InputStream instream = new FileInputStream(String.valueOf(getExternalCacheDir()) + "/userandpass.txt");
InputStreamReader inputreader = new InputStreamReader(instream);
BufferedReader buffreader = new BufferedReader(inputreader);
mTestOutput.setText(buffreader.readLine());
}
Here is the functions
private boolean downloadDropboxFile(String fileSelected) {
File dir = new File(String.valueOf(getExternalCacheDir()));
if (!dir.exists())
dir.mkdirs();
try {
File localFile = new File(dir + fileSelected);
if (!localFile.exists()) {
localFile.createNewFile();
copy(fileSelected, localFile);
} else {
}
} catch (IOException e) {
e.printStackTrace();
}
return true;
}
private void copy(final String dbPath, final File localFile) {
new Thread(new Runnable() {
#Override
public void run() {
BufferedInputStream br = null;
BufferedOutputStream bw = null;
try {
DropboxAPI.DropboxInputStream fd = mDBApi.getFileStream(dbPath,null);
br = new BufferedInputStream(fd);
bw = new BufferedOutputStream(new FileOutputStream(localFile));
byte[] buffer = new byte[4096];
int read;
while (true) {
read = br.read(buffer);
if (read <= 0) {
break;
}
bw.write(buffer, 0, read);
}
} catch (DropboxException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bw != null) {
try {
bw.close();
if (br != null) {
br.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}). start();
}
Dropbox Core API Implementation on Android Studio:
On app/libs i have the:
dropbox-android-sdk-1.6.3.jar
httpmime--4.0.3.jar
json_simple-1.1.jar

Your issue is here :
if (!localFile.exists()) {
localFile.createNewFile(); //otherwise dropbox client will fail silently
}
The exception is :
java.io.IOException: open failed: EROFS (Read-only file system)
This means you're trying to create a File on a location that is read only in the phone's memory, I'm guessing the internal storage. Have a look at this excellent answer by Mark Murphy on creating a File based on locations that can be written to.
Hoping this has been of some help, happy coding ;-)

Download all types of file from Dropbox

I am working on Dropbox. I see the documentation. This is my code to display list:
Entry entryCheck = mApi.metadata("/", 100, null, true, null);
Log.i("Item Name", entryCheck.fileName());
Log.i("Is Folder", String.valueOf(entryCheck.isDir));
I got all list from dropbox but my question is that
Here entryCheck.isDir always give me true value if it is file or directory so how i can know which is file or which one is directory?
How i downloaded that files.
I tried with this but it is not working:
private boolean downloadDropboxFile(String dbPath, File localFile,
DropboxAPI<?> api) throws IOException {
BufferedInputStream br = null;
BufferedOutputStream bw = null;
try {
if (!localFile.exists()) {
localFile.createNewFile(); // otherwise dropbox client will fail
// silently
}
DropboxInputStream fin = mApi.getFileStream("dropbox", dbPath);
br = new BufferedInputStream(fin);
bw = new BufferedOutputStream(new FileOutputStream(localFile));
byte[] buffer = new byte[4096];
int read;
while (true) {
read = br.read(buffer);
if (read <= 0) {
break;
}
bw.write(buffer, 0, read);
}
} catch (DropboxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
// in finally block:
if (bw != null) {
bw.close();
}
if (br != null) {
br.close();
}
}
return true;
}

This will work
String inPath ="mnt/sdcard/"+filename;
File file=new File(inPath);
try {
mFos = new FileOutputStream(file);
} catch (FileNotFoundException e) {
mErrorMsg = "Couldn't create a local file to store the image";
return false;
}
mApi.getFile("/"+filename, null, mFos, null);
This downloads the file and store it in the sdcard location inPath.
You have to do it in a new thread,not in main thread.Use AsyncTask.
http://www.androiddesignpatterns.com/2012/06/app-force-close-honeycomb-ics.html
this link explains why..

How to receive data from the server?

I am trying to fetchg data from server like MP3 files, video files, etc. in my application. The application should show the list of video files received from the server.
How can I do this?

/** this function will download content from the internet */
static int writeData(String fileurl, boolean append, String path,
String filename, Activity mContext) throws CustomException {
URL myfileurl = null;
ByteArrayBuffer baf = null;
HttpURLConnection conn = null;
String mimeType="";
final int length;
try {
myfileurl = new URL(fileurl);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
conn = (HttpURLConnection) myfileurl
.openConnection();
conn.setDoInput(true);
conn.connect();
conn.setConnectTimeout(100000);
length = conn.getContentLength();
mimeType=conn.getContentType().toString();
System.out.println("Extension..."+mimeType);
if(mimeType.equalsIgnoreCase("application/vnd.adobe.adept+xml") || mimeType.equalsIgnoreCase("text/html; charset=utf-8"))
return 0;
if (length > 0) {
InputStream is = conn.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
baf = new ByteArrayBuffer(1000);
int current = 0;
while ((current = bis.read()) != -1) {
try {
baf.append((byte) current);
mBufferError=false;
} catch (Exception e){
// TODO: handle exception
mBufferError=true;
e.printStackTrace();
throw new CustomException("### memory problem ", "Buffer Error");
}
}
}
} catch (IOException e) {
mBufferError=true;
e.printStackTrace();
}
try{
if(conn.getResponseCode()==200 && mBufferError==false)
{
path = path + "/" + filename;
boolean appendData = append;
FileOutputStream foutstream;
File file = new File(path);
boolean exist = false;
try {
if (appendData)
exist = file.exists();
else
exist = file.createNewFile();
} catch (IOException e) {
try {
return 1;
} catch (Exception err) {
Log.e("SAX", err.toString());
}
}
if (!appendData && !exist) {
} else if (appendData && !exist) {
} else {
try {
foutstream = new FileOutputStream(file, appendData);
foutstream.write(baf.toByteArray());
foutstream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}catch (Exception e) {
// TODO: handle exception
throw new CustomException("### I/O problem ", "I/O Error");
}
return 1;
}
once download complete search the file with extension(.3gp) for video
hope it helps

Check this link,
https://stackoverflow.com/search?q=how+to+download+mp3+%2Cvideos+from+server+in+android
Try this code
url = "your url name+filename.jpg,mp3,etc..."
FileName = "/sdcard/savefilename" // save in your sdcard
try{
java.io.BufferedInputStream in = new java.io.BufferedInputStream(new java.net.URL(url).openStream());
java.io.FileOutputStream fos = new java.io.FileOutputStream(FileName);
java.io.BufferedOutputStream bout = new BufferedOutputStream(fos,1024);
byte[] data = new byte[1024];
int x=0;
while((x=in.read(data,0,1024))>=0){
bout.write(data,0,x);
}
fos.flush();
bout.flush();
fos.close();
bout.close();
in.close();
}
catch (Exception ex)
{
}
and after you want to use MediaPlayer
and create object of mediaplayer in your activity
and play.
mp.reset();
mp.start();