| /* |
| * 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.Track; |
| import com.googlecode.mp4parser.authoring.TrackMetaData; |
| |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Queue; |
| import java.util.logging.Logger; |
| |
| /** |
| * Changes the timescale of a track by wrapping the track. |
| */ |
| public class ChangeTimeScaleTrack implements Track { |
| private static final Logger LOG = Logger.getLogger(ChangeTimeScaleTrack.class.getName()); |
| |
| Track source; |
| List<CompositionTimeToSample.Entry> ctts; |
| List<TimeToSampleBox.Entry> tts; |
| long timeScale; |
| |
| /** |
| * Changes the time scale of the source track to the target time scale and makes sure |
| * that any rounding errors that may have summed are corrected exactly before the syncSamples. |
| * |
| * @param source the source track |
| * @param targetTimeScale the resulting time scale of this track. |
| * @param syncSamples at these sync points where rounding error are corrected. |
| */ |
| public ChangeTimeScaleTrack(Track source, long targetTimeScale, long[] syncSamples) { |
| this.source = source; |
| this.timeScale = targetTimeScale; |
| double timeScaleFactor = (double) targetTimeScale / source.getTrackMetaData().getTimescale(); |
| ctts = adjustCtts(source.getCompositionTimeEntries(), timeScaleFactor); |
| tts = adjustTts(source.getDecodingTimeEntries(), timeScaleFactor, syncSamples, getTimes(source, syncSamples, targetTimeScale)); |
| } |
| |
| private static long[] getTimes(Track track, long[] syncSamples, long targetTimeScale) { |
| long[] syncSampleTimes = new long[syncSamples.length]; |
| Queue<TimeToSampleBox.Entry> timeQueue = new LinkedList<TimeToSampleBox.Entry>(track.getDecodingTimeEntries()); |
| |
| int currentSample = 1; // first syncsample is 1 |
| long currentDuration = 0; |
| long currentDelta = 0; |
| int currentSyncSampleIndex = 0; |
| long left = 0; |
| |
| |
| while (currentSample <= syncSamples[syncSamples.length - 1]) { |
| if (currentSample++ == syncSamples[currentSyncSampleIndex]) { |
| syncSampleTimes[currentSyncSampleIndex++] = (currentDuration * targetTimeScale) / track.getTrackMetaData().getTimescale(); |
| } |
| if (left-- == 0) { |
| TimeToSampleBox.Entry entry = timeQueue.poll(); |
| left = entry.getCount() - 1; |
| currentDelta = entry.getDelta(); |
| } |
| currentDuration += currentDelta; |
| } |
| return syncSampleTimes; |
| |
| } |
| |
| public SampleDescriptionBox getSampleDescriptionBox() { |
| return source.getSampleDescriptionBox(); |
| } |
| |
| public List<TimeToSampleBox.Entry> getDecodingTimeEntries() { |
| return tts; |
| } |
| |
| public List<CompositionTimeToSample.Entry> getCompositionTimeEntries() { |
| return ctts; |
| } |
| |
| 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(timeScale); |
| 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(); |
| } |
| |
| |
| /** |
| * Adjusting the composition times is easy. Just scale it by the factor - that's it. There is no rounding |
| * error summing up. |
| * |
| * @param source |
| * @param timeScaleFactor |
| * @return |
| */ |
| static List<CompositionTimeToSample.Entry> adjustCtts(List<CompositionTimeToSample.Entry> source, double 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(), (int) Math.round(timeScaleFactor * entry.getOffset()))); |
| } |
| return entries2; |
| } else { |
| return null; |
| } |
| } |
| |
| static List<TimeToSampleBox.Entry> adjustTts(List<TimeToSampleBox.Entry> source, double timeScaleFactor, long[] syncSample, long[] syncSampleTimes) { |
| |
| long[] sourceArray = TimeToSampleBox.blowupTimeToSamples(source); |
| long summedDurations = 0; |
| |
| LinkedList<TimeToSampleBox.Entry> entries2 = new LinkedList<TimeToSampleBox.Entry>(); |
| for (int i = 1; i <= sourceArray.length; i++) { |
| long duration = sourceArray[i - 1]; |
| |
| long x = Math.round(timeScaleFactor * duration); |
| |
| |
| TimeToSampleBox.Entry last = entries2.peekLast(); |
| int ssIndex; |
| if ((ssIndex = Arrays.binarySearch(syncSample, i + 1)) >= 0) { |
| // we are at the sample before sync point |
| if (syncSampleTimes[ssIndex] != summedDurations) { |
| long correction = syncSampleTimes[ssIndex] - (summedDurations + x); |
| LOG.finest(String.format("Sample %d %d / %d - correct by %d", i, summedDurations, syncSampleTimes[ssIndex], correction)); |
| x += correction; |
| } |
| } |
| summedDurations += x; |
| if (last == null) { |
| entries2.add(new TimeToSampleBox.Entry(1, x)); |
| } else if (last.getDelta() != x) { |
| entries2.add(new TimeToSampleBox.Entry(1, x)); |
| } else { |
| last.setCount(last.getCount() + 1); |
| } |
| |
| } |
| return entries2; |
| } |
| |
| public Box getMediaHeaderBox() { |
| return source.getMediaHeaderBox(); |
| } |
| |
| public SubSampleInformationBox getSubsampleInformationBox() { |
| return source.getSubsampleInformationBox(); |
| } |
| |
| @Override |
| public String toString() { |
| return "ChangeTimeScaleTrack{" + |
| "source=" + source + |
| '}'; |
| } |
| } |