| /* |
| * 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 + |
| '}'; |
| } |
| } |
| } |