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diff --git a/isoparser/src/main/java/com/googlecode/mp4parser/boxes/mp4/samplegrouping/.svn/text-base/SampleToGroupBox.java.svn-base b/isoparser/src/main/java/com/googlecode/mp4parser/boxes/mp4/samplegrouping/.svn/text-base/SampleToGroupBox.java.svn-base
new file mode 100644
index 0000000..0fa059e
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+++ b/isoparser/src/main/java/com/googlecode/mp4parser/boxes/mp4/samplegrouping/.svn/text-base/SampleToGroupBox.java.svn-base
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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 table can be used to find the group that a sample belongs to and the associated description of that
+ * sample group. The table is compactly coded with each entry giving the index of the first sample of a run of
+ * samples with the same sample group descriptor. The sample group description ID is an index that refers to a
+ * SampleGroupDescription box, which contains entries describing the characteristics of each 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 SampleToGroup 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 SampleGroupDescription shall indicate the same value for the grouping type.
+ * <p/>
+ * Version 1 of this box should only be used if a grouping type parameter is needed.
+ */
+public class SampleToGroupBox extends AbstractFullBox {
+    public static final String TYPE = "sbgp";
+
+
+    private String groupingType;
+    private String groupingTypeParameter;
+
+    List<Entry> entries = new LinkedList<Entry>();
+
+    public SampleToGroupBox() {
+        super(TYPE);
+
+    }
+
+    @Override
+    protected long getContentSize() {
+        return this.getVersion() == 1 ? entries.size() * 8 + 16 : entries.size() * 8 + 12;
+    }
+
+    @Override
+    protected void getContent(ByteBuffer byteBuffer) {
+        writeVersionAndFlags(byteBuffer);
+        byteBuffer.put(groupingType.getBytes());
+        if (this.getVersion() == 1) {
+            byteBuffer.put(groupingTypeParameter.getBytes());
+        }
+        IsoTypeWriter.writeUInt32(byteBuffer, entries.size());
+        for (Entry entry : entries) {
+            IsoTypeWriter.writeUInt32(byteBuffer, entry.getSampleCount());
+            IsoTypeWriter.writeUInt32(byteBuffer, entry.getGroupDescriptionIndex());
+        }
+
+    }
+
+    @Override
+    protected void _parseDetails(ByteBuffer content) {
+        parseVersionAndFlags(content);
+        groupingType = IsoTypeReader.read4cc(content);
+        if (this.getVersion() == 1) {
+            groupingTypeParameter = IsoTypeReader.read4cc(content);
+        }
+        long entryCount = IsoTypeReader.readUInt32(content);
+        while (entryCount-- > 0) {
+            entries.add(new Entry(l2i(IsoTypeReader.readUInt32(content)), l2i(IsoTypeReader.readUInt32(content))));
+        }
+    }
+
+    public static class Entry {
+        private long sampleCount;
+        private int groupDescriptionIndex;
+
+        public Entry(long sampleCount, int groupDescriptionIndex) {
+            this.sampleCount = sampleCount;
+            this.groupDescriptionIndex = groupDescriptionIndex;
+        }
+
+        public long getSampleCount() {
+            return sampleCount;
+        }
+
+        public void setSampleCount(long sampleCount) {
+            this.sampleCount = sampleCount;
+        }
+
+        public int getGroupDescriptionIndex() {
+            return groupDescriptionIndex;
+        }
+
+        public void setGroupDescriptionIndex(int groupDescriptionIndex) {
+            this.groupDescriptionIndex = groupDescriptionIndex;
+        }
+
+        @Override
+        public String toString() {
+            return "Entry{" +
+                    "sampleCount=" + sampleCount +
+                    ", groupDescriptionIndex=" + groupDescriptionIndex +
+                    '}';
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) {
+                return true;
+            }
+            if (o == null || getClass() != o.getClass()) {
+                return false;
+            }
+
+            Entry entry = (Entry) o;
+
+            if (groupDescriptionIndex != entry.groupDescriptionIndex) {
+                return false;
+            }
+            if (sampleCount != entry.sampleCount) {
+                return false;
+            }
+
+            return true;
+        }
+
+        @Override
+        public int hashCode() {
+            int result = (int) (sampleCount ^ (sampleCount >>> 32));
+            result = 31 * result + groupDescriptionIndex;
+            return result;
+        }
+    }
+
+    public String getGroupingType() {
+        return groupingType;
+    }
+
+    public void setGroupingType(String groupingType) {
+        this.groupingType = groupingType;
+    }
+
+    public String getGroupingTypeParameter() {
+        return groupingTypeParameter;
+    }
+
+    public void setGroupingTypeParameter(String groupingTypeParameter) {
+        this.groupingTypeParameter = groupingTypeParameter;
+    }
+
+    public List<Entry> getEntries() {
+        return entries;
+    }
+
+    public void setEntries(List<Entry> entries) {
+        this.entries = entries;
+    }
+}