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
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+++ 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 +
+                    '}';
+        }
+    }
+}