How to make good music rendering?

Question

Java

Good day to all!
I am trying to render a music file. I don't know if I'm calling it right but I mean
when the line dances to the music :D.
Everything works but not qualitatively, I do not like it. I do this: then I
public class VisualizerView extends View
override the method

@Override
    protected void onDraw(Canvas canvas) {

I take bytes[] from the music file and draw based on this
. For example:

for (int i = 0; i < bytes.length - 1; i++) {
            mPoints[i * 4] = rect.width() * i / (bytes.length - 1);
            mPoints[i * 4 + 1] = rect.height() / 2
                    + ((byte) (bytes[i] + 128)) * (rect.height() / 2) / 128;
            mPoints[i * 4 + 2] = rect.width() * (i + 1) / (bytes.length - 1);
            mPoints[i * 4 + 3] = rect.height() / 2
                    + ((byte) (bytes[i + 1] + 128)) * (rect.height() / 2)
                    / 128;
        }
        canvas.drawLines(mPoints, mPaint);

but it does not work very smoothly, does not have time to draw.
So, are there easier ways to implement this? To work faster.
Thanks!!!

Answer 1

The problem is that you are taking bytes[] in an encoded format. For such a thing - you need to write a decoder yourself in the native space, and do playback, skipping the decoded (you can get it using some codec, for example, for mp3 - lime) bytes through the buffer, drawing the picture you need along the way.

Answer 2

tsya.ru