MultiplyTimeScaleTrack.java revision dd9eb897ee7c7b507cbdcf80263bb4b5de6966bf 
1/*
2 * Copyright 2012 Sebastian Annies, Hamburg
3 *
4 * Licensed under the Apache License, Version 2.0 (the License);
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an AS IS BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package com.googlecode.mp4parser.authoring.tracks;
17
18import com.coremedia.iso.boxes.*;
19import com.googlecode.mp4parser.authoring.Movie;
20import com.googlecode.mp4parser.authoring.Track;
21import com.googlecode.mp4parser.authoring.TrackMetaData;
22
23import java.nio.ByteBuffer;
24import java.util.ArrayList;
25import java.util.LinkedList;
26import java.util.List;
27
28import static com.googlecode.mp4parser.util.CastUtils.l2i;
29import static com.googlecode.mp4parser.util.Math.gcd;
30import static com.googlecode.mp4parser.util.Math.lcm;
31import static java.lang.Math.round;
32
33/**
34 * Changes the timescale of a track by wrapping the track.
35 */
36public class MultiplyTimeScaleTrack implements Track {
37    Track source;
38    private int timeScaleFactor;
39
40    public MultiplyTimeScaleTrack(Track source, int timeScaleFactor) {
41        this.source = source;
42        this.timeScaleFactor = timeScaleFactor;
43    }
44
45    public SampleDescriptionBox getSampleDescriptionBox() {
46        return source.getSampleDescriptionBox();
47    }
48
49    public List<TimeToSampleBox.Entry> getDecodingTimeEntries() {
50        return adjustTts(source.getDecodingTimeEntries(), timeScaleFactor);
51    }
52
53    public List<CompositionTimeToSample.Entry> getCompositionTimeEntries() {
54        return adjustCtts(source.getCompositionTimeEntries(), timeScaleFactor);
55    }
56
57    public long[] getSyncSamples() {
58        return source.getSyncSamples();
59    }
60
61    public List<SampleDependencyTypeBox.Entry> getSampleDependencies() {
62        return source.getSampleDependencies();
63    }
64
65    public TrackMetaData getTrackMetaData() {
66        TrackMetaData trackMetaData = (TrackMetaData) source.getTrackMetaData().clone();
67        trackMetaData.setTimescale(source.getTrackMetaData().getTimescale() * this.timeScaleFactor);
68        return trackMetaData;
69    }
70
71    public String getHandler() {
72        return source.getHandler();
73    }
74
75    public boolean isEnabled() {
76        return source.isEnabled();
77    }
78
79    public boolean isInMovie() {
80        return source.isInMovie();
81    }
82
83    public boolean isInPreview() {
84        return source.isInPreview();
85    }
86
87    public boolean isInPoster() {
88        return source.isInPoster();
89    }
90
91    public List<ByteBuffer> getSamples() {
92        return source.getSamples();
93    }
94
95
96    static List<CompositionTimeToSample.Entry> adjustCtts(List<CompositionTimeToSample.Entry> source, int timeScaleFactor) {
97        if (source != null) {
98            List<CompositionTimeToSample.Entry> entries2 = new ArrayList<CompositionTimeToSample.Entry>(source.size());
99            for (CompositionTimeToSample.Entry entry : source) {
100                entries2.add(new CompositionTimeToSample.Entry(entry.getCount(), timeScaleFactor * entry.getOffset()));
101            }
102            return entries2;
103        } else {
104            return null;
105        }
106    }
107
108    static List<TimeToSampleBox.Entry> adjustTts(List<TimeToSampleBox.Entry> source, int timeScaleFactor) {
109        LinkedList<TimeToSampleBox.Entry> entries2 = new LinkedList<TimeToSampleBox.Entry>();
110        for (TimeToSampleBox.Entry e : source) {
111            entries2.add(new TimeToSampleBox.Entry(e.getCount(), timeScaleFactor * e.getDelta()));
112        }
113        return entries2;
114    }
115
116    public Box getMediaHeaderBox() {
117        return source.getMediaHeaderBox();
118    }
119
120    public SubSampleInformationBox getSubsampleInformationBox() {
121        return source.getSubsampleInformationBox();
122    }
123
124    @Override
125    public String toString() {
126        return "MultiplyTimeScaleTrack{" +
127                "source=" + source +
128                '}';
129    }
130}
131