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Diffstat (limited to 'isoparser/src/main/java/com/coremedia/iso/boxes/SampleToChunkBox.java')
-rw-r--r-- | isoparser/src/main/java/com/coremedia/iso/boxes/SampleToChunkBox.java | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/isoparser/src/main/java/com/coremedia/iso/boxes/SampleToChunkBox.java b/isoparser/src/main/java/com/coremedia/iso/boxes/SampleToChunkBox.java new file mode 100644 index 0000000..593504d --- /dev/null +++ b/isoparser/src/main/java/com/coremedia/iso/boxes/SampleToChunkBox.java @@ -0,0 +1,156 @@ +/* + * 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 + + '}'; + } + } +} |