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  */
16 package com.googlecode.mp4parser.authoring;
17 
18 import java.util.LinkedList;
19 import java.util.List;
20 
21 /**
22  *
23  */
24 public class Movie {
25     List<Track> tracks = new LinkedList<Track>();
26 
getTracks()27     public List<Track> getTracks() {
28         return tracks;
29     }
30 
setTracks(List<Track> tracks)31     public void setTracks(List<Track> tracks) {
32         this.tracks = tracks;
33     }
34 
addTrack(Track nuTrack)35     public void addTrack(Track nuTrack) {
36         // do some checking
37         // perhaps the movie needs to get longer!
38         if (getTrackByTrackId(nuTrack.getTrackMetaData().getTrackId()) != null) {
39             // We already have a track with that trackId. Create a new one
40             nuTrack.getTrackMetaData().setTrackId(getNextTrackId());
41         }
42         tracks.add(nuTrack);
43     }
44 
45 
46     @Override
toString()47     public String toString() {
48         String s = "Movie{ ";
49         for (Track track : tracks) {
50             s += "track_" + track.getTrackMetaData().getTrackId() + " (" + track.getHandler() + ") ";
51         }
52 
53         s += '}';
54         return s;
55     }
56 
getNextTrackId()57     public long getNextTrackId() {
58         long nextTrackId = 0;
59         for (Track track : tracks) {
60             nextTrackId = nextTrackId < track.getTrackMetaData().getTrackId() ? track.getTrackMetaData().getTrackId() : nextTrackId;
61         }
62         return ++nextTrackId;
63     }
64 
65 
66     public Track getTrackByTrackId(long trackId) {
67         for (Track track : tracks) {
68             if (track.getTrackMetaData().getTrackId() == trackId) {
69                 return track;
70             }
71         }
72         return null;
73     }
74 
75 
76     public long getTimescale() {
77         long timescale = this.getTracks().iterator().next().getTrackMetaData().getTimescale();
78         for (Track track : this.getTracks()) {
79             timescale = gcd(track.getTrackMetaData().getTimescale(), timescale);
80         }
81         return timescale;
82     }
83 
84     public static long gcd(long a, long b) {
85         if (b == 0) {
86             return a;
87         }
88         return gcd(b, a % b);
89     }
90 
91 }
92