1 files changed, 130 insertions, 0 deletions
diff --git a/isoparser/src/main/java/com/googlecode/mp4parser/authoring/tracks/MultiplyTimeScaleTrack.java b/isoparser/src/main/java/com/googlecode/mp4parser/authoring/tracks/MultiplyTimeScaleTrack.java
new file mode 100644
index 0000000..e9a90e4
--- /dev/null
+++ b/isoparser/src/main/java/com/googlecode/mp4parser/authoring/tracks/MultiplyTimeScaleTrack.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2012 Sebastian Annies, Hamburg
+ *
+ * Licensed under the Apache License, Version 2.0 (the License);
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.googlecode.mp4parser.authoring.tracks;
+
+import com.coremedia.iso.boxes.*;
+import com.googlecode.mp4parser.authoring.Movie;
+import com.googlecode.mp4parser.authoring.Track;
+import com.googlecode.mp4parser.authoring.TrackMetaData;
+
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+
+import static com.googlecode.mp4parser.util.CastUtils.l2i;
+import static com.googlecode.mp4parser.util.Math.gcd;
+import static com.googlecode.mp4parser.util.Math.lcm;
+import static java.lang.Math.round;
+
+/**
+ * Changes the timescale of a track by wrapping the track.
+ */
+public class MultiplyTimeScaleTrack implements Track {
+    Track source;
+    private int timeScaleFactor;
+
+    public MultiplyTimeScaleTrack(Track source, int timeScaleFactor) {
+        this.source = source;
+        this.timeScaleFactor = timeScaleFactor;
+    }
+
+    public SampleDescriptionBox getSampleDescriptionBox() {
+        return source.getSampleDescriptionBox();
+    }
+
+    public List<TimeToSampleBox.Entry> getDecodingTimeEntries() {
+        return adjustTts(source.getDecodingTimeEntries(), timeScaleFactor);
+    }
+
+    public List<CompositionTimeToSample.Entry> getCompositionTimeEntries() {
+        return adjustCtts(source.getCompositionTimeEntries(), timeScaleFactor);
+    }
+
+    public long[] getSyncSamples() {
+        return source.getSyncSamples();
+    }
+
+    public List<SampleDependencyTypeBox.Entry> getSampleDependencies() {
+        return source.getSampleDependencies();
+    }
+
+    public TrackMetaData getTrackMetaData() {
+        TrackMetaData trackMetaData = (TrackMetaData) source.getTrackMetaData().clone();
+        trackMetaData.setTimescale(source.getTrackMetaData().getTimescale() * this.timeScaleFactor);
+        return trackMetaData;
+    }
+
+    public String getHandler() {
+        return source.getHandler();
+    }
+
+    public boolean isEnabled() {
+        return source.isEnabled();
+    }
+
+    public boolean isInMovie() {
+        return source.isInMovie();
+    }
+
+    public boolean isInPreview() {
+        return source.isInPreview();
+    }
+
+    public boolean isInPoster() {
+        return source.isInPoster();
+    }
+
+    public List<ByteBuffer> getSamples() {
+        return source.getSamples();
+    }
+
+
+    static List<CompositionTimeToSample.Entry> adjustCtts(List<CompositionTimeToSample.Entry> source, int timeScaleFactor) {
+        if (source != null) {
+            List<CompositionTimeToSample.Entry> entries2 = new ArrayList<CompositionTimeToSample.Entry>(source.size());
+            for (CompositionTimeToSample.Entry entry : source) {
+                entries2.add(new CompositionTimeToSample.Entry(entry.getCount(), timeScaleFactor * entry.getOffset()));
+            }
+            return entries2;
+        } else {
+            return null;
+        }
+    }
+
+    static List<TimeToSampleBox.Entry> adjustTts(List<TimeToSampleBox.Entry> source, int timeScaleFactor) {
+        LinkedList<TimeToSampleBox.Entry> entries2 = new LinkedList<TimeToSampleBox.Entry>();
+        for (TimeToSampleBox.Entry e : source) {
+            entries2.add(new TimeToSampleBox.Entry(e.getCount(), timeScaleFactor * e.getDelta()));
+        }
+        return entries2;
+    }
+
+    public Box getMediaHeaderBox() {
+        return source.getMediaHeaderBox();
+    }
+
+    public SubSampleInformationBox getSubsampleInformationBox() {
+        return source.getSubsampleInformationBox();
+    }
+
+    @Override
+    public String toString() {
+        return "MultiplyTimeScaleTrack{" +
+                "source=" + source +
+                '}';
+    }
+}