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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/webrtc/audio_delay_stats_reporter.h"
#include <numeric>
#include "base/metrics/histogram_macros.h"
namespace media {
namespace {
// No input data or overflow checks are made here. Input values should be small
// compared to the int range, and number of values should not be too large.
int CalculateVariance(const std::vector<int>& values) {
DCHECK_GT(values.size(), 1ul);
if (values.size() <= 1)
return 0;
const int mean =
std::accumulate(values.begin(), values.end(), 0) / values.size();
int mean_diff_square_sum = 0;
for (auto value : values) {
const int mean_diff = value - mean;
mean_diff_square_sum += mean_diff * mean_diff;
}
return mean_diff_square_sum / (values.size() - 1);
}
} // namespace
AudioDelayStatsReporter::AudioDelayStatsReporter(int variance_window_size)
: variance_window_size_(variance_window_size),
delay_histogram_min_(base::Milliseconds(1)),
delay_histogram_max_(base::Milliseconds(500)) {
DCHECK_GT(variance_window_size_, 1);
capture_delays_ms_.reserve(variance_window_size_);
render_delays_ms_.reserve(variance_window_size_);
total_delays_ms_.reserve(variance_window_size_);
DETACH_FROM_THREAD(thread_checker_);
}
AudioDelayStatsReporter::~AudioDelayStatsReporter() {}
void AudioDelayStatsReporter::ReportDelay(base::TimeDelta capture_delay,
base::TimeDelta render_delay) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
const base::TimeDelta total_delay = capture_delay + render_delay;
UMA_HISTOGRAM_CUSTOM_TIMES("Media.Audio.Processing.CaptureDelayMs",
capture_delay, delay_histogram_min_,
delay_histogram_max_, 50);
UMA_HISTOGRAM_CUSTOM_TIMES("Media.Audio.Processing.RenderDelayMs",
render_delay, delay_histogram_min_,
delay_histogram_max_, 50);
UMA_HISTOGRAM_CUSTOM_TIMES("Media.Audio.Processing.TotalDelayMs", total_delay,
delay_histogram_min_, delay_histogram_max_, 50);
capture_delays_ms_.push_back(capture_delay.InMilliseconds());
render_delays_ms_.push_back(render_delay.InMilliseconds());
total_delays_ms_.push_back(total_delay.InMilliseconds());
if (capture_delays_ms_.size() ==
static_cast<unsigned long>(variance_window_size_)) {
DCHECK_EQ(render_delays_ms_.size(), capture_delays_ms_.size());
DCHECK_EQ(total_delays_ms_.size(), capture_delays_ms_.size());
int delay_variance = CalculateVariance(capture_delays_ms_);
UMA_HISTOGRAM_CUSTOM_COUNTS("Media.Audio.Processing.CaptureDelayVarianceMs",
delay_variance, 1, 500, 50);
capture_delays_ms_.clear();
delay_variance = CalculateVariance(render_delays_ms_);
UMA_HISTOGRAM_CUSTOM_COUNTS("Media.Audio.Processing.RenderDelayVarianceMs",
delay_variance, 1, 500, 50);
render_delays_ms_.clear();
delay_variance = CalculateVariance(total_delays_ms_);
UMA_HISTOGRAM_CUSTOM_COUNTS("Media.Audio.Processing.TotalDelayVarianceMs",
delay_variance, 1, 500, 50);
total_delays_ms_.clear();
}
}
} // namespace media
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