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/*
* Copyright (C) 2016 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;
import java.util.Arrays;
/**
* Maintains two ring buffers for recording wav data
* At any one time one buffer is available for writing to file while one is recording incoming data
*/
public class WaveDataRingBuffer {
public interface ReadableWaveDeck {
boolean writeToFile(AudioFileOutput audioFile);
}
private WaveDeck mLoadedDeck;
private WaveDeck mShelvedDeck;
public WaveDataRingBuffer(int size) {
if (size < Constant.SAMPLING_RATE_MIN * Constant.BUFFER_TEST_DURATION_SECONDS_MIN) {
size = Constant.SAMPLING_RATE_MIN * Constant.BUFFER_TEST_DURATION_SECONDS_MIN;
} else if (size > Constant.SAMPLING_RATE_MAX * Constant.BUFFER_TEST_DURATION_SECONDS_MAX) {
size = Constant.SAMPLING_RATE_MAX * Constant.BUFFER_TEST_DURATION_SECONDS_MAX;
}
mLoadedDeck = new WaveDeck(size);
mShelvedDeck = new WaveDeck(size);
}
public synchronized void writeWaveData(double[] data, int srcPos, int length) {
mLoadedDeck.writeWaveData(data, srcPos, length);
}
public synchronized double[] getWaveRecord() {
return mLoadedDeck.getWaveRecord();
}
private void SwapDecks() {
WaveDeck temp = mShelvedDeck;
mShelvedDeck = mLoadedDeck;
mLoadedDeck = temp;
}
/**
* Returns currently writing buffer as writeToFile interface, load erased shelved deck for write
* If shelved deck is still being read returns null
**/
public synchronized ReadableWaveDeck getWaveDeck() {
if (!mShelvedDeck.isBeingRead()) {
SwapDecks();
mShelvedDeck.readyForRead();
mLoadedDeck.reset();
return mShelvedDeck;
} else {
return null;
}
}
/**
* Maintains a recording of wave data of last n seconds
*/
public class WaveDeck implements ReadableWaveDeck {
private double[] mWaveRecord;
private volatile int mIndex = 0; // between 0 and mWaveRecord.length - 1
private boolean mArrayFull = false; // true after mIndex has wrapped
private boolean mIsBeingRead = false;
public WaveDeck(int size) {
mWaveRecord = new double[size];
}
/**
* Write length number of doubles from data into ring buffer from starting srcPos
*/
public void writeWaveData(double[] data, int srcPos, int length) {
if (length > data.length - srcPos) {
// requested to write more data than available
// bad request leave data un-affected
return;
}
if (length >= mWaveRecord.length) {
// requested write would fill or exceed ring buffer capacity
// fill ring buffer with last segment of requested write
System.arraycopy(data, srcPos + (length - mWaveRecord.length), mWaveRecord, 0,
mWaveRecord.length);
mIndex = 0;
} else if (mWaveRecord.length - mIndex > length) {
// write requested data from current offset
System.arraycopy(data, srcPos, mWaveRecord, mIndex, length);
mIndex += length;
} else {
// write to available buffer then wrap and overwrite previous records
if (!mArrayFull) {
mArrayFull = true;
}
int availBuff = mWaveRecord.length - mIndex;
System.arraycopy(data, srcPos, mWaveRecord, mIndex, availBuff);
System.arraycopy(data, srcPos + availBuff, mWaveRecord, 0, length - availBuff);
mIndex = length - availBuff;
}
}
/**
* Returns a private copy of recorded wave data
*
* @return double array of wave recording, rearranged with oldest sample at first index
*/
public double[] getWaveRecord() {
double outputBuffer[] = new double[mWaveRecord.length];
if (!mArrayFull) {
//return partially filled sample with trailing zeroes
System.arraycopy(mWaveRecord, 0, outputBuffer, 0, mIndex);
Arrays.fill(outputBuffer, mIndex+1, outputBuffer.length-1, 0);
} else {
//copy buffer to contiguous sample and return unwrapped array
System.arraycopy(mWaveRecord, mIndex, outputBuffer, 0, mWaveRecord.length - mIndex);
System.arraycopy(mWaveRecord, 0, outputBuffer, mWaveRecord.length - mIndex, mIndex);
}
return outputBuffer;
}
/** Make buffer available for new recording **/
public void reset() {
mIndex = 0;
mArrayFull = false;
}
public boolean isBeingRead() {
return mIsBeingRead;
}
private void readyForRead() {
mIsBeingRead = true;
}
@Override
public boolean writeToFile(AudioFileOutput audioFile) {
boolean successfulWrite;
if (mArrayFull) {
successfulWrite = audioFile.writeRingBufferData(mWaveRecord, mIndex, mIndex);
} else {
// Write only filled part of array to file
successfulWrite = audioFile.writeRingBufferData(mWaveRecord, 0, mIndex);
}
mIsBeingRead = false;
return successfulWrite;
}
}
}
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