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/*
* Copyright (C) 2017 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.
*/
#define LOG_TAG "CameraLatencyHistogram"
#include <inttypes.h>
#include <utils/Log.h>
#include <utils/String8.h>
#include "LatencyHistogram.h"
namespace android {
CameraLatencyHistogram::CameraLatencyHistogram(int32_t binSizeMs, int32_t binCount) :
mBinSizeMs(binSizeMs),
mBinCount(binCount),
mBins(binCount),
mTotalCount(0) {
}
void CameraLatencyHistogram::add(nsecs_t start, nsecs_t end) {
nsecs_t duration = end - start;
int32_t durationMs = static_cast<int32_t>(duration / 1000000LL);
int32_t binIndex = durationMs / mBinSizeMs;
if (binIndex < 0) {
binIndex = 0;
} else if (binIndex >= mBinCount) {
binIndex = mBinCount-1;
}
mBins[binIndex]++;
mTotalCount++;
}
void CameraLatencyHistogram::reset() {
memset(mBins.data(), 0, mBins.size() * sizeof(int64_t));
mTotalCount = 0;
}
void CameraLatencyHistogram::dump(int fd, const char* name) const {
if (mTotalCount == 0) {
return;
}
String8 lines;
lines.appendFormat("%s (%" PRId64 ") samples\n", name, mTotalCount);
String8 lineBins, lineBinCounts;
formatHistogramText(lineBins, lineBinCounts);
lineBins.append("\n");
lineBinCounts.append("\n");
lines.append(lineBins);
lines.append(lineBinCounts);
write(fd, lines.string(), lines.size());
}
void CameraLatencyHistogram::log(const char* fmt, ...) {
if (mTotalCount == 0) {
return;
}
va_list args;
va_start(args, fmt);
String8 histogramName = String8::formatV(fmt, args);
ALOGI("%s (%" PRId64 ") samples:", histogramName.string(), mTotalCount);
va_end(args);
String8 lineBins, lineBinCounts;
formatHistogramText(lineBins, lineBinCounts);
ALOGI("%s", lineBins.c_str());
ALOGI("%s", lineBinCounts.c_str());
}
void CameraLatencyHistogram::formatHistogramText(
String8& lineBins, String8& lineBinCounts) const {
lineBins = " ";
lineBinCounts = " ";
for (int32_t i = 0; i < mBinCount; i++) {
if (i == mBinCount - 1) {
lineBins.append(" inf (max ms)");
} else {
lineBins.appendFormat("%7d", mBinSizeMs*(i+1));
}
lineBinCounts.appendFormat(" %02.2f", 100.0*mBins[i]/mTotalCount);
}
lineBinCounts.append(" (%)");
}
}; //namespace android