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/*
* Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "api/test/metrics/stdout_metrics_exporter.h"
#include <stdio.h>
#include <cmath>
#include <string>
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "api/test/metrics/metric.h"
#include "rtc_base/strings/string_builder.h"
namespace webrtc {
namespace test {
namespace {
// Returns positive integral part of the number.
int64_t IntegralPart(double value) {
return std::lround(std::floor(std::abs(value)));
}
void AppendWithPrecision(double value,
int digits_after_comma,
rtc::StringBuilder& out) {
int64_t multiplier = std::lround(std::pow(10, digits_after_comma));
int64_t integral_part = IntegralPart(value);
double decimal_part = std::abs(value) - integral_part;
// If decimal part has leading zeros then when it will be multiplied on
// `multiplier`, leading zeros will be lost. To preserve them we add "1"
// so then leading digit will be greater than 0 and won't be removed.
//
// During conversion to the string leading digit has to be stripped.
//
// Also due to rounding it may happen that leading digit may be incremented,
// like with `digits_after_comma` 3 number 1.9995 will be rounded to 2. In
// such case this increment has to be propagated to the `integral_part`.
int64_t decimal_holder = std::lround((1 + decimal_part) * multiplier);
if (decimal_holder >= 2 * multiplier) {
// Rounding incremented added leading digit, so we need to transfer 1 to
// integral part.
integral_part++;
decimal_holder -= multiplier;
}
// Remove trailing zeros.
while (decimal_holder % 10 == 0) {
decimal_holder /= 10;
}
// Print serialized number to output.
if (value < 0) {
out << "-";
}
out << integral_part;
if (decimal_holder != 1) {
out << "." << std::to_string(decimal_holder).substr(1, digits_after_comma);
}
}
} // namespace
StdoutMetricsExporter::StdoutMetricsExporter() : output_(stdout) {}
bool StdoutMetricsExporter::Export(rtc::ArrayView<const Metric> metrics) {
for (const Metric& metric : metrics) {
PrintMetric(metric);
}
return true;
}
void StdoutMetricsExporter::PrintMetric(const Metric& metric) {
rtc::StringBuilder value_stream;
value_stream << metric.test_case << " / " << metric.name << "= {mean=";
if (metric.stats.mean.has_value()) {
AppendWithPrecision(*metric.stats.mean, 8, value_stream);
} else {
value_stream << "-";
}
value_stream << ", stddev=";
if (metric.stats.stddev.has_value()) {
AppendWithPrecision(*metric.stats.stddev, 8, value_stream);
} else {
value_stream << "-";
}
value_stream << "} " << ToString(metric.unit) << " ("
<< ToString(metric.improvement_direction) << ")";
fprintf(output_, "RESULT: %s\n", value_stream.str().c_str());
}
} // namespace test
} // namespace webrtc
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