1 files changed, 67 insertions, 0 deletions
diff --git a/tuner/src/com/android/tv/tuner/exoplayer/buffer/SamplePool.java b/tuner/src/com/android/tv/tuner/exoplayer/buffer/SamplePool.java
new file mode 100644
index 00000000..b89a14db
--- /dev/null
+++ b/tuner/src/com/android/tv/tuner/exoplayer/buffer/SamplePool.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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.android.tv.tuner.exoplayer.buffer;
+
+import com.google.android.exoplayer.SampleHolder;
+import java.util.LinkedList;
+
+/** Pool of samples to recycle ByteBuffers as much as possible. */
+public class SamplePool {
+    private final LinkedList<SampleHolder> mSamplePool = new LinkedList<>();
+
+    /**
+     * Acquires a sample with a buffer larger than size from the pool. Allocate new one or resize an
+     * existing buffer if necessary.
+     */
+    public synchronized SampleHolder acquireSample(int size) {
+        if (mSamplePool.isEmpty()) {
+            SampleHolder sample = new SampleHolder(SampleHolder.BUFFER_REPLACEMENT_MODE_NORMAL);
+            sample.ensureSpaceForWrite(size);
+            return sample;
+        }
+        SampleHolder smallestSufficientSample = null;
+        SampleHolder maxSample = mSamplePool.getFirst();
+        for (SampleHolder sample : mSamplePool) {
+            // Grab the smallest sufficient sample.
+            if (sample.data.capacity() >= size
+                    && (smallestSufficientSample == null
+                            || smallestSufficientSample.data.capacity() > sample.data.capacity())) {
+                smallestSufficientSample = sample;
+            }
+
+            // Grab the max size sample.
+            if (maxSample.data.capacity() < sample.data.capacity()) {
+                maxSample = sample;
+            }
+        }
+        SampleHolder sampleFromPool = smallestSufficientSample;
+
+        // If there's no sufficient sample, grab the maximum sample and resize it to size.
+        if (sampleFromPool == null) {
+            sampleFromPool = maxSample;
+            sampleFromPool.ensureSpaceForWrite(size);
+        }
+        mSamplePool.remove(sampleFromPool);
+        return sampleFromPool;
+    }
+
+    /** Releases the sample back to the pool. */
+    public synchronized void releaseSample(SampleHolder sample) {
+        sample.clearData();
+        mSamplePool.offerLast(sample);
+    }
+}