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/*
* Copyright 2008 CoreMedia AG, 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.coremedia.iso.boxes;
import com.coremedia.iso.IsoTypeReader;
import com.coremedia.iso.IsoTypeWriter;
import com.googlecode.mp4parser.AbstractFullBox;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import static com.googlecode.mp4parser.util.CastUtils.l2i;
/**
* Samples within the media data are grouped into chunks. Chunks can be of different sizes, and the
* samples within a chunk can have different sizes. This table can be used to find the chunk that
* contains a sample, its position, and the associated sample description. Defined in ISO/IEC 14496-12.
*/
public class SampleToChunkBox extends AbstractFullBox {
List<Entry> entries = Collections.emptyList();
public static final String TYPE = "stsc";
public SampleToChunkBox() {
super(TYPE);
}
public List<Entry> getEntries() {
return entries;
}
public void setEntries(List<Entry> entries) {
this.entries = entries;
}
protected long getContentSize() {
return entries.size() * 12 + 8;
}
@Override
public void _parseDetails(ByteBuffer content) {
parseVersionAndFlags(content);
int entryCount = l2i(IsoTypeReader.readUInt32(content));
entries = new ArrayList<Entry>(entryCount);
for (int i = 0; i < entryCount; i++) {
entries.add(new Entry(
IsoTypeReader.readUInt32(content),
IsoTypeReader.readUInt32(content),
IsoTypeReader.readUInt32(content)));
}
}
@Override
protected void getContent(ByteBuffer byteBuffer) {
writeVersionAndFlags(byteBuffer);
IsoTypeWriter.writeUInt32(byteBuffer, entries.size());
for (Entry entry : entries) {
IsoTypeWriter.writeUInt32(byteBuffer, entry.getFirstChunk());
IsoTypeWriter.writeUInt32(byteBuffer, entry.getSamplesPerChunk());
IsoTypeWriter.writeUInt32(byteBuffer, entry.getSampleDescriptionIndex());
}
}
public String toString() {
return "SampleToChunkBox[entryCount=" + entries.size() + "]";
}
/**
* Decompresses the list of entries and returns the number of samples per chunk for
* every single chunk.
*
* @param chunkCount overall number of chunks
* @return number of samples per chunk
*/
public long[] blowup(int chunkCount) {
long[] numberOfSamples = new long[chunkCount];
int j = 0;
List<SampleToChunkBox.Entry> sampleToChunkEntries = new LinkedList<Entry>(entries);
Collections.reverse(sampleToChunkEntries);
Iterator<Entry> iterator = sampleToChunkEntries.iterator();
SampleToChunkBox.Entry currentEntry = iterator.next();
for (int i = numberOfSamples.length; i > 1; i--) {
numberOfSamples[i - 1] = currentEntry.getSamplesPerChunk();
if (i == currentEntry.getFirstChunk()) {
currentEntry = iterator.next();
}
}
numberOfSamples[0] = currentEntry.getSamplesPerChunk();
return numberOfSamples;
}
public static class Entry {
long firstChunk;
long samplesPerChunk;
long sampleDescriptionIndex;
public Entry(long firstChunk, long samplesPerChunk, long sampleDescriptionIndex) {
this.firstChunk = firstChunk;
this.samplesPerChunk = samplesPerChunk;
this.sampleDescriptionIndex = sampleDescriptionIndex;
}
public long getFirstChunk() {
return firstChunk;
}
public void setFirstChunk(long firstChunk) {
this.firstChunk = firstChunk;
}
public long getSamplesPerChunk() {
return samplesPerChunk;
}
public void setSamplesPerChunk(long samplesPerChunk) {
this.samplesPerChunk = samplesPerChunk;
}
public long getSampleDescriptionIndex() {
return sampleDescriptionIndex;
}
public void setSampleDescriptionIndex(long sampleDescriptionIndex) {
this.sampleDescriptionIndex = sampleDescriptionIndex;
}
@Override
public String toString() {
return "Entry{" +
"firstChunk=" + firstChunk +
", samplesPerChunk=" + samplesPerChunk +
", sampleDescriptionIndex=" + sampleDescriptionIndex +
'}';
}
}
}
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