diff options
Diffstat (limited to 'isoparser/src/main/java/com/googlecode/mp4parser/authoring/tracks/.svn/text-base/ChangeTimeScaleTrack.java.svn-base')
| -rw-r--r-- | isoparser/src/main/java/com/googlecode/mp4parser/authoring/tracks/.svn/text-base/ChangeTimeScaleTrack.java.svn-base | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/isoparser/src/main/java/com/googlecode/mp4parser/authoring/tracks/.svn/text-base/ChangeTimeScaleTrack.java.svn-base b/isoparser/src/main/java/com/googlecode/mp4parser/authoring/tracks/.svn/text-base/ChangeTimeScaleTrack.java.svn-base deleted file mode 100644 index 50f76c2..0000000 --- a/isoparser/src/main/java/com/googlecode/mp4parser/authoring/tracks/.svn/text-base/ChangeTimeScaleTrack.java.svn-base +++ /dev/null @@ -1,203 +0,0 @@ -/* - * 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 + - '}'; - } -}
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