Hi,
When I call getWaveForm method of Visualizer class, most of time I get all
-128 in byte array and sometimes I get different values in byte array (this
is correct). I though it may be sound volume issue, but applied both high
volume and low volume in code and got same result. My sample audio file
length is 2/3 seconds.
I have attached my file, plz check it. Dont be confused to see the code,
basically it is a PhoneGap plugin part. Please see the Android part
(especially getWaveForm() of Visualizer class), that I am facing issue.
My question is why I am getting some times correct value in byte array.
Though most of time I am getting -128 in array.
This can not be a solution, I need a stable solution. I need getWaveForm
method will return different values (not all -128).
Any idea?
-arefin
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package com.first;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.audiofx.Equalizer;
import android.media.audiofx.Visualizer;
import android.util.Log;
import org.apache.cordova.*;
import org.apache.cordova.api.Plugin;
import org.apache.cordova.api.PluginResult;
import org.json.JSONArray;
import org.json.JSONException;
import java.io.IOException;
public class Audio2Wave extends Plugin {
private static final String CONVERT = "convert";
private static final int JSON_INDEX = 0;
// private String output="";
MediaPlayer mp;
// Vizualization
private Visualizer mVisualizer;
@Override
public PluginResult execute(String arg0, final JSONArray arg1, String arg2) {
// TODO Auto-generated method stub
if (arg0.equals(CONVERT)) {
try {
String url = arg1.getString(JSON_INDEX);
// start media player - like normal
mp = new MediaPlayer();
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mp.setDataSource(url); // set data source our URL
// defined
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try { // tell your player to go to prepare state
mp.prepare();
// mp.prepareAsync();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Start stream / player
mp.start();
// mp.setVolume(1,1);
// Visualizer object and attach it to media player.
// NEED android.permission.RECORD_AUDIO for that in
// AndroidManifest.xml
mVisualizer = new Visualizer(mp.getAudioSessionId());
mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
mVisualizer.setDataCaptureListener(
new Visualizer.OnDataCaptureListener() {
public void onWaveFormDataCapture(
Visualizer visualizer, byte[] bytes,
int samplingRate) {
}
public void onFftDataCapture(Visualizer visualizer,
byte[] bytes, int samplingRate) {
}
}, Visualizer.getMaxCaptureRate() / 2, true, false);
// enable vizualizer
mVisualizer.setEnabled(true);
try {
String output = "";
int captureSize = mVisualizer.getCaptureSize();
byte[] waves = new byte[captureSize];
// conver to waveform
int result = mVisualizer.getWaveForm(waves);
if (result == 0) {
// success
Log.i("arefin", "success");
// conver byte array to sting
for (int i = 0; i < waves.length; i++) {
output = output + waves[i] + ",";
}
if (output.length() != 0) {
output = output.substring(0, output.length() - 1);
}
} else if (result == -6) {
// no memory
Log.i("arefin", "no memory");
} else if (result == -5) {
// invalid operation
Log.i("arefin", "invalid operation");
} else if (result == -7) {
// Operation failed due to dead remote object.
Log.i("arefin",
"Operation failed due to dead remote object");
}
// disable the visualizer
if (!mp.isPlaying()) {
mVisualizer.setEnabled(false);
mVisualizer.release();
mp.release();
mp = null;
}
return new PluginResult(PluginResult.Status.OK, output);
} catch (IllegalStateException er) {
er.printStackTrace();
} catch (Exception ex) {
ex.printStackTrace();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
return new PluginResult(PluginResult.Status.JSON_EXCEPTION);
}
} else {
return new PluginResult(PluginResult.Status.INVALID_ACTION);
}
return new PluginResult(PluginResult.Status.INVALID_ACTION);
}
}
