Android - Create Waveform Of The Audio File (ogg)

How can I create a simple waveform of the ogg file (like in RingDroid)? Is there any simple way? I found a source code of RingDroid (https://code.google.com/p/ringdroid/) but it´s

Solution 1:

You can use Visualizer to get the waveform data

MediaPlayermediaPlayer=newMediaPlayer();
.
.
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intaudioSessionID= mediaPlayer.getAudioSessionId();

// Enable Equalizer if waveform was affected by device volume.// Equalizer equalizer = new Equalizer(0, audioSessionID);// equalizer.setEnabled(true);// Need android.permission.RECORD_AUDIO.Visualizervisualizer=newVisualizer(audioSessionID);
visualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
visualizer.setDataCaptureListener(newVisualizer.OnDataCaptureListener() {
            publicvoidonWaveFormDataCapture(Visualizer visualizer, byte[] bytes,
                    int samplingRate) {
                // Send bytes (waveform) to your custom UI view to show it.
            }

            publicvoidonFftDataCapture(Visualizer visualizer, byte[] bytes, int samplingRate) {}
        }, Visualizer.getMaxCaptureRate() / 2, true, false);
visualizer.setEnabled(true);

mediaPlayer.setOnCompletionListener(newMediaPlayer.OnCompletionListener() {
            publicvoidonCompletion(MediaPlayer mediaPlayer) {
                visualizer.setEnabled(false);
            }
        });

// TODO :: Do not forget to release visualizer onPause.

Check this view http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android-apps/4.4.4_r1/com/example/android/apis/media/AudioFxDemo.java#VisualizerView on how to draw the waveform from the data retrieved from the Visualizer

if (mPoints == null || mPoints.length < mBytes.length * 4) {
    mPoints = newfloat[mBytes.length * 4];
}

mRect.set(0, 0, getWidth(), getHeight());

for (int i = 0; i < mBytes.length - 1; i++) {
    mPoints[i * 4] = mRect.width() * i / (mBytes.length - 1);
    mPoints[i * 4 + 1] = mRect.height() / 2
            + ((byte) (mBytes[i] + 128)) * (mRect.height() / 2) / 128;
    mPoints[i * 4 + 2] = mRect.width() * (i + 1) / (mBytes.length - 1);
    mPoints[i * 4 + 3] = mRect.height() / 2
            + ((byte) (mBytes[i + 1] + 128)) * (mRect.height() / 2) / 128;
}

canvas.drawLines(mPoints, mForePaint);