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/*
* 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.builder;
import com.coremedia.iso.boxes.TimeToSampleBox;
import com.googlecode.mp4parser.authoring.Movie;
import com.googlecode.mp4parser.authoring.Track;
import java.util.Arrays;
import java.util.List;
/**
* This <code>FragmentIntersectionFinder</code> cuts the input movie in 2 second
* snippets.
*/
public class TwoSecondIntersectionFinder implements FragmentIntersectionFinder {
protected long getDuration(Track track) {
long duration = 0;
for (TimeToSampleBox.Entry entry : track.getDecodingTimeEntries()) {
duration += entry.getCount() * entry.getDelta();
}
return duration;
}
/**
* {@inheritDoc}
*/
public long[] sampleNumbers(Track track, Movie movie) {
List<TimeToSampleBox.Entry> entries = track.getDecodingTimeEntries();
double trackLength = 0;
for (Track thisTrack : movie.getTracks()) {
double thisTracksLength = getDuration(thisTrack) / thisTrack.getTrackMetaData().getTimescale();
if (trackLength < thisTracksLength) {
trackLength = thisTracksLength;
}
}
int fragmentCount = (int)Math.ceil(trackLength / 2) - 1;
if (fragmentCount < 1) {
fragmentCount = 1;
}
long fragments[] = new long[fragmentCount];
Arrays.fill(fragments, -1);
fragments[0] = 1;
long time = 0;
int samples = 0;
for (TimeToSampleBox.Entry entry : entries) {
for (int i = 0; i < entry.getCount(); i++) {
int currentFragment = (int) (time / track.getTrackMetaData().getTimescale() / 2) + 1;
if (currentFragment >= fragments.length) {
break;
}
fragments[currentFragment] = samples++ + 1;
time += entry.getDelta();
}
}
long last = samples + 1;
// fill all -1 ones.
for (int i = fragments.length - 1; i >= 0; i--) {
if (fragments[i] == -1) {
fragments[i] = last ;
}
last = fragments[i];
}
return fragments;
}
}
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