package org.jcodec.movtool;

import java.io.File;
import org.jcodec.containers.mp4.boxes.Box;
import org.jcodec.containers.mp4.boxes.MediaHeaderBox;
import org.jcodec.containers.mp4.boxes.MovieBox;
import org.jcodec.containers.mp4.boxes.MovieFragmentBox;
import org.jcodec.containers.mp4.boxes.NodeBox;
import org.jcodec.containers.mp4.boxes.TrakBox;

public class ChangeTimescale {
  public static void main1(String[] args) throws Exception {
    if (args.length < 2) {
      System.out.println("Syntax: chts <movie> <timescale>");
      System.exit(-1);
    } 
    final int ts = Integer.parseInt(args[1]);
    if (ts < 600) {
      System.out.println("Could not set timescale < 600");
      System.exit(-1);
    } 
    new InplaceMP4Editor().modify(new File(args[0]), new MP4Edit() {
          public void apply(MovieBox mov) {
            TrakBox vt = mov.getVideoTrack();
            MediaHeaderBox mdhd = NodeBox.<MediaHeaderBox>findFirstPath(vt, MediaHeaderBox.class, Box.path("mdia.mdhd"));
            int oldTs = mdhd.getTimescale();
            if (oldTs > ts)
              throw new RuntimeException("Old timescale (" + oldTs + ") is greater then new timescale (" + ts + "), not touching."); 
            vt.fixMediaTimescale(ts);
            mov.fixTimescale(ts);
          }
          
          public void applyToFragment(MovieBox mov, MovieFragmentBox[] fragmentBox) {
            throw new RuntimeException("Unsupported");
          }
        });
  }
}