Develop Reference

Android - ffmpeg best approach

I am trying to build ffmpeg for android. I want to achieve two things with it.
1. Rotate video
2. Join two or more videos.
There are two approaches for having ffmpeg in my application.
1. Having ffmpeg executable, copying it to /data/package/ and executing ffmpeg commands.
2. Build ffmpeg library .so file with ndk and write jni code etc.
Which approach is best according to my needs? And can I have some code snippets that follows those approaches?

You can achieve it by two ways, I would do it with the first one:
Place your ffmpeg file into you raw folder.
You need to use the ffmpeg executable file using commands, but you'll need to place the file into a file-system folder and change the permissions of the file, so use this code:
public static void installBinaryFromRaw(Context context, int resId, File file) {
final InputStream rawStream = context.getResources().openRawResource(resId);
final OutputStream binStream = getFileOutputStream(file);
if (rawStream != null && binStream != null) {
pipeStreams(rawStream, binStream);
try {
rawStream.close();
binStream.close();
} catch (IOException e) {
Log.e(TAG, "Failed to close streams!", e);
}
doChmod(file, 777);
}
}
public static OutputStream getFileOutputStream(File file) {
try {
return new FileOutputStream(file);
} catch (FileNotFoundException e) {
Log.e(TAG, "File not found attempting to stream file.", e);
}
return null;
}
public static void pipeStreams(InputStream is, OutputStream os) {
byte[] buffer = new byte[IO_BUFFER_SIZE];
int count;
try {
while ((count = is.read(buffer)) > 0) {
os.write(buffer, 0, count);
}
} catch (IOException e) {
Log.e(TAG, "Error writing stream.", e);
}
}
public static void doChmod(File file, int chmodValue) {
final StringBuilder sb = new StringBuilder();
sb.append("chmod");
sb.append(' ');
sb.append(chmodValue);
sb.append(' ');
sb.append(file.getAbsolutePath());
try {
Runtime.getRuntime().exec(sb.toString());
} catch (IOException e) {
Log.e(TAG, "Error performing chmod", e);
}
}
Call this method:
private void installFfmpeg() {
File ffmpegFile = new File(getCacheDir(), "ffmpeg");
String mFfmpegInstallPath = ffmpegFile.toString();
Log.d(TAG, "ffmpeg install path: " + mFfmpegInstallPath);
if (!ffmpegFile.exists()) {
try {
ffmpegFile.createNewFile();
} catch (IOException e) {
Log.e(TAG, "Failed to create new file!", e);
}
Utils.installBinaryFromRaw(this, R.raw.ffmpeg, ffmpegFile);
}else{
Log.d(TAG, "It was installed");
}
ffmpegFile.setExecutable(true);
}
Then, you will have your ffmpeg file ready to use by commands. (This way works for me but there are some people that says that it doesn't work, I don't know why, hope it isn't your case). Then, we use the ffmpeg with this code:
String command = "data/data/YOUR_PACKAGE/cache/ffmpeg" + THE_REST_OF_YOUR_COMMAND;
try {
Process process = Runtime.getRuntime().exec(command);
process.waitFor();
Log.d(TAG, "Process finished");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
As I said, you have to use the ffmpeg file by commands, so you should search on Internet and choose the command you want to use, then, add it into the command string. If the command fails, you won't be alerted by any log, so you should try your command with a terminal emulator and be sure that it works. If it doesn´t work, you won't see any result.
Hope it's useful!!

The advantage of library approach is that you have better control over the progress of your conversion, and can tune it in the middle. One the other hand, operating the executable is a bit easier. Finally, you can simply install the ffmpeg4android app and work with their API.

Android - Equalizer usePreset not working (No change in sound effect)

I am working on streaming radio application. everything is working fine except the changing the equalizer effect does not affect sound.
Changing the equalizer effect by calling usePreset(preset) does not make any changes in the sound effects.
Even though there is no error, why usePreset does not change the sound effects.
I have tested in samsung galaxy sII with 4.0.3.
public void startPlayer() {
//
// Check whether we can acquire the audio focus
// to start the player
//
if (!requestAudioFocus()) {
return;
}
if (null != mAudioPlayer) {
if (mAudioPlayer.isPlaying()) {
mAudioPlayer.stop();
}
mAudioPlayer.reset();
} else {
mAudioPlayer = new MediaPlayer();
mAudioPlayer.reset();
}
try {
notifyProgressUpdate(PLAYER_INITIALIZING);
try {
mEqualizer = new Equalizer(0, mAudioPlayer.getAudioSessionId());
mEqualizer.setEnabled(true);
Log.d(TAG,
"Audio Session ID " + mAudioPlayer.getAudioSessionId()
+ "Equalizer " + mEqualizer + " Preset "
+ mEqualizer.getCurrentPreset());
} catch (Exception ex) {
mEqualizer = null;
}
mAudioPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mAudioPlayer.setDataSource(mCurrentTrack.getStreamURL());
//
// Add the Listener to track the player status
//
mAudioPlayer.setOnCompletionListener(this);
mAudioPlayer.setOnBufferingUpdateListener(this);
mAudioPlayer.setOnPreparedListener(this);
mAudioPlayer.setOnInfoListener(this);
mAudioPlayer.setOnErrorListener(this);
notifyProgressUpdate(PLAYER_BUFFERING);
mAudioPlayer.prepareAsync();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//Get the available presets from the equalizer
public String[] getEqualizerPresets() {
String[] presets = null;
short noOfPresets = -1;
if (null != mEqualizer) {
noOfPresets = mEqualizer.getNumberOfPresets();
presets = new String[noOfPresets];
for (short index = 0; index < noOfPresets; index++) {
presets[index] = mEqualizer.getPresetName(index);
}
}
return presets;
}
//Set the user preferred presets
public void setEqualizerPreset(int position) {
if (null != mEqualizer) {
Log.d(TAG, "setting equlizer effects " + position);
Log.d(TAG, "Equalizer " + mEqualizer + " set Preset " + position);
mEqualizer.usePreset((short)position);
Log.d(TAG, "Equalizer " + mEqualizer + " current Preset "
+ mEqualizer.getCurrentPreset());
}
}
Appreciate your help to identify the issue.
EDIT
This issue is not resolved yet. i did not find any sample code which explain Equalizer Preset usage.
Any reference to code sample which uses Preset welcome.

this is a fully source code for equalizer, hope this will help you

I have the same problem. When I load it on emulator it produce an error that I don't really know why, it always says ...audiofx.Equalizer. and audiofx.AudioEffect. or something similar. But I have discovered that if you have other media player like n7player in my case, try to close it and try again your media player. In my case it works, but I think that it has to be one method to get some equalizer that is active.

Using MediaPlayer to play an AMR file created by MediaRecorder fails with muri null

I am writing an app that records voice from the microphone in AMR format using MediaRecorder, and then plays the data back using MediaPlayer.
That's the goal anyway.
I am fairly confident my MediaRecorder side is working, I'm producing the data file in the right place at the right data rate. Here's how I start and stop my MediaRecorder
public void OnStartRecord(View v )
{
System.out.println( "StartRecord");
try {
audioFile = File.createTempFile("amrtmp", ".amr", getApplicationContext().getFilesDir());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println( "Recording to " + audioFile.getAbsolutePath());
mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_COMMUNICATION);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mRecorder.setAudioEncodingBitRate(4750);
mRecorder.setAudioSamplingRate(8000);
mRecorder.setOutputFile(audioFile.getAbsolutePath());
try {
mRecorder.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
mRecorder.start();
}
public void OnStopRecord(View v )
{
System.out.println( "StopRecord");
mRecorder.stop();
mRecorder.release();
}
This works like a charm. Typical output is something like
StartRecord
Recording to /data/data/com.test.playback/files/amrtmp-235967797.amr
And when I start, then stop recording I can see that the file has been created and it has a certain amount of data in it that properly corresponds to the settings.
Side note: I detect an odd buzzing at my speaker while this runs. Any idea what that is?
When I try to play the file back however I have no end of trouble. I have tried the following:
public void OnPlay(View v )
{
MediaPlayer mPlayer = new MediaPlayer();
mPlayer.setAudioStreamType(AudioManager.STREAM_VOICE_CALL);
FileInputStream FIS = null;
try {
FIS = new FileInputStream(audioFile.getAbsolutePath());
mPlayer.setDataSource(FIS.getFD());
mPlayer.prepare();
}
catch( Exception e )
{
e.printStackTrace();
}
mPlayer.start();
}
This results in nothing being played at all with the following output from MediaPlayer:
start() mURI is null
I have also tried the same code, but setting mPlayer's data source differently:
mPlayer.setDataSource(audioFile.getAbsolutePath());
This fails when prepare is called witha java.io.IOException status 0x1.
I have to imagine there is something else I need to do with MediaPlayer to set it up properly. Any suggestions?

Need help debugging my code

I need some input about my code.
Basically, I have a method to load music from Class A
public void onListItemClick(ListView parent, View v, int position, long id){
musicIndex = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
cursor.moveToPosition(position);
filePath = cursor.getString(musicIndex);
fileName = new File(filePath).getName();
playMusic();//Play the selected music
}
public void playMusic(){
if(mPlayer.isPlaying()){
mPlayer.reset();
}
try{
mPlayer.setDataSource(filePath);
mPlayer.prepare();
mPlayer.start();
BeatDetection beatDetect = new BeatDetection();
beatDetect.init();
}catch (Exception e){
}
}
That method will call the init() method in Class B
public void init() throws Exception{
energy = 0;
variance = 0;
constant = 0;
isBeat = false;
sensitivity = 0;
dBuffer = new float[sampleRate / bufferSize];
eBuffer = new float[sampleRate / bufferSize];
timer = System.currentTimeMillis();
MusicLoad msc = new MusicLoad();
totalMs = 0;
seeking = true;
//msc.printText();
decode(msc.fileName, 25, 40);
}
In that method, it initializes everything and call the decode() method
public void decode(String path, int startMs, int maxMs)
throws IOException, javazoom.jl.decoder.DecoderException {
debug();
File in = new File(path);
InputStream inStream = new BufferedInputStream(new FileInputStream(in), 8 * 1024);
ByteArrayOutputStream outStream = new ByteArrayOutputStream(1024);
try {
Bitstream bitstream = new Bitstream(inStream);
Decoder decoder = new Decoder();
boolean done = false;
while (! done) {
Header frameHeader = bitstream.readFrame();
if (frameHeader == null) {
done = true;
} else {
totalMs += frameHeader.ms_per_frame();
if (totalMs >= startMs) {
seeking = false;
}
if (! seeking) {
SampleBuffer output = (SampleBuffer) decoder.decodeFrame(frameHeader, bitstream);
if (output.getSampleFrequency() != 44100 || output.getChannelCount() != 2) {
throw new javazoom.jl.decoder.DecoderException("mono or non-44100 MP3 not supported", null);
}
short[] pcm = output.getBuffer();
for (short s : pcm) {
outStream.write(s & 0xff);
outStream.write((s >> 8 ) & 0xff);
}
}
if (totalMs >= (startMs + maxMs)) {
done = true;
}
}
bitstream.closeFrame();
}
byte[] abAudioData = outStream.toByteArray();
calculation(abAudioData);
} catch (BitstreamException e) {
throw new IOException("Bitstream error: " + e);
} catch (DecoderException e) {
Log.w("Decoder error", e);
throw new javazoom.jl.decoder.DecoderException("Error",e);
} finally {
inStream.close();
}
}
Don't mind reading all the code lines. If you guys notice I put debug() in the beginning to see whether the method is called or not. At this point, the debug() is properly called. However, if I put the debug() after the line File in = new File(path);, the debug() will not be called anymore. It seems like the code is stop running at that point.
The ultimate result is, I can load and play the song without any problem. However, the decode() is not called and there is no error whatsoever. I'm stuck at pointing out the problem at this point. So if there's any input please help me.
EDIT: After I tried tracing the "path" variable, it returns NULL so the error is NullPointerException. Seems like the "fileName" variable from Class A is not passed to Class B. Any suggestion?

If you are using Eclipse with ADT then it's very easy to debug your Android apps, just add a breakpoint (probably in the new File(...) line) and see what happens.
My guess here is that File in = new File(path); probably is throwing a IOException in your decode method, that exception is bubbling first to init() and then to playMusic(), where it is caught by try catch block. Your catch is empty so you are not seeing anything. Try debugging as I said or add some logging info in the catch block.

This is just something to look at, but from the doc page
http://developer.android.com/reference/java/io/File.html#File%28java.lang.String%29
"The actual file referenced by a File may or may not exist. It may also, despite the name File, be a directory or other non-regular file."
If you had the path wrong, it may be trying to create the file and you may not have the correct permission to do so. Perhaps: WRITE_EXTERNAL_STORAGE.

I know this post is old, but I just wanted to show how to get the file path to read/write files for others that come across this post as I have:
String filePath = myContext.getFilesDir().getPath().toString() + "/sysout.log";
File file = new File(filePath);
These two lines will create (open if it exists, and overwrite) a file named "sysout.log" in the folder /data/data/com.app.name/files/; myContext is just the current context. Using this technique alleviates problems with defining your own path name. Hope this helps someone.

How to play online stream in Android

I have online radio (shout cast ) in web. I want to develop android app for listen this stream. so I want to know how to play online stream in android. using URL. In Android Im not going to Stream the audio. I want listen the web stream from android app.
How to do that..?
thanks

Something like
private void init() throws IOException {
try {
mediaPlayer = new MediaPlayer();
String streamPath = "";//enter path
mediaPlayer.setDataSource(streamPath);
mediaPlayer.prepare();
} catch (MalformedURLException ex) {
throw new RuntimeException("Wrong url for mediaplayer! " + ex);
} catch (IllegalStateException ex) {
} catch (IllegalArgumentException ex) {
throw new RuntimeException("Wrong url for mediaplayer! " + ex);
}
}
private void play() {
mediaPlayer.start();
}

Please refer the link it may help you a while, http://developer.android.com/guide/topics/media/index.html