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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 org.drrickorang.loopback;
/**
* This class is a pipe that allows one writer and one reader.
*/
public abstract class Pipe {
public static final int OVERRUN = -2; // when there's an overrun, return this value
protected int mSamplesOverrun;
protected int mOverruns;
protected final int mMaxValues; // always in power of two
/** maxSamples must be >= 2. */
public Pipe(int maxSamples) {
mMaxValues = Utilities.roundup(maxSamples); // round up to the nearest power of 2
}
/**
* Read at most "count" number of samples into array "buffer", starting from index "offset".
* If the available samples to read is smaller than count, just read as much as it can and
* return the amount of samples read (non-blocking). offset + count must be <= buffer.length.
*/
public abstract int read(short[] buffer, int offset, int count);
/** Return the amount of samples available to read. */
public abstract int availableToRead();
/** Clear the pipe. */
public abstract void flush();
}
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