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/*
* Copyright 2012 castLabs, Berlin
*
* 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.boxes.mp4.samplegrouping;
import com.coremedia.iso.IsoTypeReader;
import com.coremedia.iso.IsoTypeWriter;
import com.googlecode.mp4parser.AbstractFullBox;
import java.nio.ByteBuffer;
import java.util.LinkedList;
import java.util.List;
import static com.googlecode.mp4parser.util.CastUtils.l2i;
/**
* This description table gives information about the characteristics of sample groups. The descriptive
* information is any other information needed to define or characterize the sample group.
* <p/>
* There may be multiple instances of this box if there is more than one sample grouping for the samples in a
* track. Each instance of the SampleGroupDescription box has a type code that distinguishes different
* sample groupings. Within a track, there shall be at most one instance of this box with a particular grouping
* type. The associated SampleToGroup shall indicate the same value for the grouping type.
* <p/>
* The information is stored in the sample group description box after the entry-count. An abstract entry type is
* defined and sample groupings shall define derived types to represent the description of each sample group.
* For video tracks, an abstract VisualSampleGroupEntry is used with similar types for audio and hint tracks.
*/
public class SampleGroupDescriptionBox extends AbstractFullBox {
public static final String TYPE = "sgpd";
private String groupingType;
private int defaultLength;
private List<GroupEntry> groupEntries = new LinkedList<GroupEntry>();
private int descriptionLength;
public SampleGroupDescriptionBox() {
super(TYPE);
}
@Override
protected long getContentSize() {
long size = 8;
if (getVersion() == 1) {
size += 4;
}
size += 4; // entryCount
for (GroupEntry groupEntry : groupEntries) {
if (getVersion() == 1 && defaultLength == 0) {
size += 4;
}
size += groupEntry.size();
}
return size;
}
@Override
protected void getContent(ByteBuffer byteBuffer) {
writeVersionAndFlags(byteBuffer);
byteBuffer.put(groupingType.getBytes());
if (this.getVersion() == 1) {
IsoTypeWriter.writeUInt32(byteBuffer, defaultLength);
}
IsoTypeWriter.writeUInt32(byteBuffer, this.groupEntries.size());
for (GroupEntry entry : groupEntries) {
if (this.getVersion() == 1 && defaultLength == 0) {
IsoTypeWriter.writeUInt32(byteBuffer, entry.get().limit());
}
byteBuffer.put(entry.get());
}
}
@Override
protected void _parseDetails(ByteBuffer content) {
parseVersionAndFlags(content);
if (this.getVersion() != 1) {
throw new RuntimeException("SampleGroupDescriptionBox are only supported in version 1");
}
groupingType = IsoTypeReader.read4cc(content);
if (this.getVersion() == 1) {
defaultLength = l2i(IsoTypeReader.readUInt32(content));
}
long entryCount = IsoTypeReader.readUInt32(content);
while (entryCount-- > 0) {
int length = defaultLength;
if (this.getVersion() == 1) {
if (defaultLength == 0) {
descriptionLength = l2i(IsoTypeReader.readUInt32(content));
length = descriptionLength;
}
} else {
throw new RuntimeException("This should be implemented");
}
int finalPos = content.position() + length;
ByteBuffer parseMe = content.slice();
parseMe.limit(length);
groupEntries.add(parseGroupEntry(parseMe, groupingType));
content.position(finalPos);
}
}
private GroupEntry parseGroupEntry(ByteBuffer content, String groupingType) {
GroupEntry groupEntry;
if (RollRecoveryEntry.TYPE.equals(groupingType)) {
groupEntry = new RollRecoveryEntry();
} else if (RateShareEntry.TYPE.equals(groupingType)) {
groupEntry = new RateShareEntry();
} else if (CencSampleEncryptionInformationGroupEntry.TYPE.equals(groupingType)) {
groupEntry = new CencSampleEncryptionInformationGroupEntry();
} else if (VisualRandomAccessEntry.TYPE.equals(groupingType)) {
groupEntry = new VisualRandomAccessEntry();
} else if (TemporalLevelEntry.TYPE.equals(groupingType)) {
groupEntry = new TemporalLevelEntry();
} else {
groupEntry = new UnknownEntry();
}
groupEntry.parse(content);
return groupEntry;
}
public String getGroupingType() {
return groupingType;
}
public void setGroupingType(String groupingType) {
this.groupingType = groupingType;
}
public int getDefaultLength() {
return defaultLength;
}
public void setDefaultLength(int defaultLength) {
this.defaultLength = defaultLength;
}
public List<GroupEntry> getGroupEntries() {
return groupEntries;
}
public void setGroupEntries(List<GroupEntry> groupEntries) {
this.groupEntries = groupEntries;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
SampleGroupDescriptionBox that = (SampleGroupDescriptionBox) o;
if (defaultLength != that.defaultLength) {
return false;
}
if (groupEntries != null ? !groupEntries.equals(that.groupEntries) : that.groupEntries != null) {
return false;
}
if (groupingType != null ? !groupingType.equals(that.groupingType) : that.groupingType != null) {
return false;
}
return true;
}
@Override
public int hashCode() {
int result = groupingType != null ? groupingType.hashCode() : 0;
result = 31 * result + defaultLength;
result = 31 * result + (groupEntries != null ? groupEntries.hashCode() : 0);
return result;
}
@Override
public String toString() {
return "SampleGroupDescriptionBox{" +
"groupingType='" + groupingType + '\'' +
", defaultLength=" + defaultLength +
", groupEntries=" + groupEntries +
'}';
}
}
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