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  Minimize a DLS soundbank  (Read 1108 times)
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Offline krasse
« Posted 2011-02-28 12:56:50 »

This is a useful piece of code if you have a DLS soundbank and want to minimize it with just the instruments/samples actually used in the song(s). If you for example bundle your soundbank in the jar-file, you can get some significant savings.

You'll have to get the gervill.jar first which is available here:
http://java.net/projects/gervill/downloads


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import java.io.File;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;

import com.sun.media.sound.DLSInstrument;
import com.sun.media.sound.DLSRegion;
import com.sun.media.sound.DLSSample;
import com.sun.media.sound.DLSSoundbank;
import com.sun.media.sound.ModelPatch;

public class DLSUtils {

   public static DLSSoundbank createSimplifiedSoundbank(
         DLSSoundbank soundbank, Map<Integer, Collection<Integer>> patches,
         Map<Integer, Collection<Integer>> percussionKeys) {

      DLSSoundbank result = new DLSSoundbank();

      LinkedHashSet<DLSSample> samples = new LinkedHashSet<DLSSample>();

      for (Integer bank : patches.keySet()) {

         Collection<Integer> programs = patches.get(bank);
         for (Integer program : programs) {
            ModelPatch patch = new ModelPatch(bank, program, false);
            DLSInstrument instrument = (DLSInstrument) soundbank
                  .getInstrument(patch);

            List<DLSRegion> regions = instrument.getRegions();

            for (DLSRegion region : regions) {
               DLSSample sample = region.getSample();
               samples.add(sample);
            }
            result.addInstrument(instrument);
         }
      }
      for (Integer program : percussionKeys.keySet()) {

         Collection<Integer> keys = percussionKeys.get(program);
         // for (Integer program : programs) {
         ModelPatch patch = new ModelPatch(0, program, true);
         DLSInstrument instrument = (DLSInstrument) soundbank
               .getInstrument(patch);

         List<DLSRegion> regions = instrument.getRegions();

         ArrayList<DLSRegion> toRemove = new ArrayList<DLSRegion>();
         for (DLSRegion region : regions) {
            boolean add = false;
            for (Integer key : keys) {
               if (region.getKeyfrom() <= key && region.getKeyto() >= key) {
                  add = true;
                  break;
               }
            }
            if (add) {
               DLSSample sample = region.getSample();
               samples.add(sample);
            } else {
               toRemove.add(region);
            }
         }
         regions.removeAll(toRemove);
         
         result.addInstrument(instrument);
      }
      for (DLSSample sample : samples) {
         result.addResource(sample);
      }

      return result;
   }

   public static void main(String[] args) throws Exception {
      DLSSoundbank sb = new DLSSoundbank(new FileInputStream(
            "thepath/gm.dls"));

      Map<Integer, Collection<Integer>> patches = new LinkedHashMap<Integer, Collection<Integer>>();
      Map<Integer, Collection<Integer>> percussionKeys = new LinkedHashMap<Integer, Collection<Integer>>();
      ArrayList<Integer> percussionKeysList = new ArrayList<Integer>();
      percussionKeysList.add(35);
      percussionKeysList.add(38);
      percussionKeys.put(0, percussionKeysList);

      ArrayList<Integer> melodicInstrumentList = new ArrayList<Integer>();
      melodicInstrumentList.add(0);
      patches.put(0, melodicInstrumentList);

      DLSSoundbank sbResult = createSimplifiedSoundbank(sb, patches,
            percussionKeys);

      sbResult
            .save(new File("thepath/gm2.dls"));

   }

}

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