1 files changed, 152 insertions, 0 deletions
diff --git a/isoparser/src/main/java/com/coremedia/iso/boxes/.svn/text-base/TimeToSampleBox.java.svn-base b/isoparser/src/main/java/com/coremedia/iso/boxes/.svn/text-base/TimeToSampleBox.java.svn-base
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+++ b/isoparser/src/main/java/com/coremedia/iso/boxes/.svn/text-base/TimeToSampleBox.java.svn-base
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+/*  
+ * 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.List;
+
+import static com.googlecode.mp4parser.util.CastUtils.l2i;
+
+/**
+ * This box contains a compact version of a table that allows indexing from decoding time to sample number.
+ * Other tables give sample sizes and pointers, from the sample number. Each entry in the table gives the
+ * number of consecutive samples with the same time delta, and the delta of those samples. By adding the
+ * deltas a complete time-to-sample map may be built.<br>
+ * The Decoding Time to Sample Box contains decode time delta's: <code>DT(n+1) = DT(n) + STTS(n)</code> where STTS(n)
+ * is the (uncompressed) table entry for sample n.<br>
+ * The sample entries are ordered by decoding time stamps; therefore the deltas are all non-negative. <br>
+ * The DT axis has a zero origin; <code>DT(i) = SUM(for j=0 to i-1 of delta(j))</code>, and the sum of all
+ * deltas gives the length of the media in the track (not mapped to the overall timescale, and not considering
+ * any edit list).    <br>
+ * The Edit List Box provides the initial CT value if it is non-empty (non-zero).
+ */
+public class TimeToSampleBox extends AbstractFullBox {
+    public static final String TYPE = "stts";
+
+    List<Entry> entries = Collections.emptyList();
+
+
+    public TimeToSampleBox() {
+        super(TYPE);
+    }
+
+    protected long getContentSize() {
+        return 8 + entries.size() * 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)));
+        }
+
+    }
+
+    @Override
+    protected void getContent(ByteBuffer byteBuffer) {
+        writeVersionAndFlags(byteBuffer);
+        IsoTypeWriter.writeUInt32(byteBuffer, entries.size());
+        for (Entry entry : entries) {
+            IsoTypeWriter.writeUInt32(byteBuffer, entry.getCount());
+            IsoTypeWriter.writeUInt32(byteBuffer, entry.getDelta());
+        }
+    }
+
+    public List<Entry> getEntries() {
+        return entries;
+    }
+
+    public void setEntries(List<Entry> entries) {
+        this.entries = entries;
+    }
+
+    public String toString() {
+        return "TimeToSampleBox[entryCount=" + entries.size() + "]";
+    }
+
+    public static class Entry {
+        long count;
+        long delta;
+
+        public Entry(long count, long delta) {
+            this.count = count;
+            this.delta = delta;
+        }
+
+        public long getCount() {
+            return count;
+        }
+
+        public long getDelta() {
+            return delta;
+        }
+
+        public void setCount(long count) {
+            this.count = count;
+        }
+
+        public void setDelta(long delta) {
+            this.delta = delta;
+        }
+
+        @Override
+        public String toString() {
+            return "Entry{" +
+                    "count=" + count +
+                    ", delta=" + delta +
+                    '}';
+        }
+    }
+
+    /**
+     * Decompresses the list of entries and returns the list of decoding times.
+     *
+     * @return decoding time per sample
+     */
+    public static long[] blowupTimeToSamples(List<TimeToSampleBox.Entry> entries) {
+        long numOfSamples = 0;
+        for (TimeToSampleBox.Entry entry : entries) {
+            numOfSamples += entry.getCount();
+        }
+        assert numOfSamples <= Integer.MAX_VALUE;
+        long[] decodingTime = new long[(int) numOfSamples];
+
+        int current = 0;
+
+
+        for (TimeToSampleBox.Entry entry : entries) {
+            for (int i = 0; i < entry.getCount(); i++) {
+                decodingTime[current++] = entry.getDelta();
+            }
+        }
+
+        return decodingTime;
+    }
+
+
+}