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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;
import java.util.Arrays;
import android.util.Log;
/**
* This class records the buffer period of the audio player or recorder when in Java mode.
* Currently the accuracy is in 1ms.
*/
//TODO for native mode, should use a scale more accurate than the current 1ms
public class BufferPeriod {
private static final String TAG = "BufferPeriod";
private long mStartTimeNs = 0; // first time collectBufferPeriod() is called
private long mPreviousTimeNs = 0;
private long mCurrentTimeNs = 0;
private int mMaxBufferPeriod = 0;
private int mCount = 0;
private final int range = 1002; // store counts for 0ms to 1000ms, and for > 1000ms
private int[] mBufferPeriod = new int[range];
private BufferCallbackTimes mCallbackTimes;
private CaptureHolder mCaptureHolder;
/**
* For player, this function is called before every AudioTrack.write().
* For recorder, this function is called after every AudioRecord.read() with read > 0.
*/
public void collectBufferPeriod() {
mCurrentTimeNs = System.nanoTime();
mCount++;
// if mPreviousTimeNs = 0, it's the first time this function is called
if (mPreviousTimeNs == 0) {
mStartTimeNs = mCurrentTimeNs;
}
final int discard = 10; // discard the first few buffer period values
if (mPreviousTimeNs != 0 && mCount > discard) {
long diffInNano = mCurrentTimeNs - mPreviousTimeNs;
// diffInMilli is rounded up
int diffInMilli = (int) ((diffInNano + Constant.NANOS_PER_MILLI - 1) /
Constant.NANOS_PER_MILLI);
long timeStampInNano = mCurrentTimeNs - mStartTimeNs;
int timeStampInMilli = (int) ((timeStampInNano + Constant.NANOS_PER_MILLI - 1) /
Constant.NANOS_PER_MILLI);
if (diffInMilli > mMaxBufferPeriod) {
mMaxBufferPeriod = diffInMilli;
}
// from 0 ms to 1000 ms, plus a sum of all occurrences > 1000ms
if (diffInMilli >= (range - 1)) {
mBufferPeriod[range - 1]++;
} else if (diffInMilli >= 0) {
mBufferPeriod[diffInMilli]++;
} else { // for diffInMilli < 0
log("Having negative BufferPeriod.");
}
mCallbackTimes.recordCallbackTime(timeStampInMilli, (short) diffInMilli);
// If diagnosing specific Java thread callback behavior set a conditional here and use
// mCaptureHolder.captureState(rank); to capture systraces and bugreport and/or wav file
}
mPreviousTimeNs = mCurrentTimeNs;
}
/** Reset all variables, called if wants to start a new buffer period's record. */
public void resetRecord() {
mPreviousTimeNs = 0;
mCurrentTimeNs = 0;
Arrays.fill(mBufferPeriod, 0);
mMaxBufferPeriod = 0;
mCount = 0;
mCallbackTimes = null;
}
public void prepareMemberObjects(int maxRecords, int expectedBufferPeriod,
CaptureHolder captureHolder){
mCallbackTimes = new BufferCallbackTimes(maxRecords, expectedBufferPeriod);
mCaptureHolder = captureHolder;
}
public int[] getBufferPeriodArray() {
return mBufferPeriod;
}
public int getMaxBufferPeriod() {
return mMaxBufferPeriod;
}
public BufferCallbackTimes getCallbackTimes(){
return mCallbackTimes;
}
private static void log(String msg) {
Log.v(TAG, msg);
}
}
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