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/*
* 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);
}
}
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