Android - creating a sound file form (OGG)
How do I create a simple signal of an ogg file (like RingDroid )? Is there an easy way?
I found RingDroid source code ( https://code.google.com/p/ringdroid/ ) but it doesn't support ogg format. I am using Android 4.0+.
Is there an easy way to do this?
Thanks for the advice.
EDIT: I want to create something like this (waveform for the whole song)
Hope this is clear. If you have any questions, please ask.
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1 answer
You can use Visualizer to get waveform data
MediaPlayer mediaPlayer = new MediaPlayer();
.
.
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int audioSessionID = 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.
Visualizer visualizer = new Visualizer(audioSessionID);
visualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
visualizer.setDataCaptureListener(new Visualizer.OnDataCaptureListener() {
public void onWaveFormDataCapture(Visualizer visualizer, byte[] bytes,
int samplingRate) {
// Send bytes (waveform) to your custom UI view to show it.
}
public void onFftDataCapture(Visualizer visualizer, byte[] bytes, int samplingRate) {}
}, Visualizer.getMaxCaptureRate() / 2, true, false);
visualizer.setEnabled(true);
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
public void onCompletion(MediaPlayer mediaPlayer) {
visualizer.setEnabled(false);
}
});
// TODO :: Do not forget to release visualizer onPause.
Check this look 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 a waveform from data received from the Visualizer
if (mPoints == null || mPoints.length < mBytes.length * 4) {
mPoints = new float[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);
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