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/*
Copyright (C) 2025 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "audio_buffers.h"
#include "level_calculator.h"
using std::make_pair;
using std::shared_ptr;
using boost::optional;
constexpr int frames_per_measurement = 48000 / 30;
LevelCalculator::LevelCalculator()
: _enabled(false)
{
}
void
LevelCalculator::put(shared_ptr<const AudioBuffers> audio, dcpomatic::DCPTime time, int frame_rate)
{
if (!_enabled) {
std::cout << "no calcs for me.\n";
return;
}
boost::mutex::scoped_lock lm(_current_mutex);
auto const channels = audio->channels();
if (static_cast<int>(_current_peaks.size()) != channels) {
_current_peaks.resize(channels);
}
auto const data = audio->data();
auto const frames = audio->frames();
for (auto frame = 0; frame < frames; ++frame) {
for (auto channel = 0; channel < channels; ++channel) {
_current_peaks[channel] = std::max(std::abs(data[channel][frame]), _current_peaks[channel]);
}
++_current_frames;
if (_current_frames == frames_per_measurement) {
{
boost::mutex::scoped_lock lm(_store_mutex);
_peaks.emplace_back(time + dcpomatic::DCPTime::from_frames(frame, frame_rate), _current_peaks);
}
std::fill(_current_peaks.begin(), _current_peaks.end(), 0.0f);
_current_frames = 0;
}
}
}
void
LevelCalculator::clear()
{
boost::mutex::scoped_lock slm(_store_mutex);
_peaks.clear();
boost::mutex::scoped_lock clm(_current_mutex);
std::fill(_current_peaks.begin(), _current_peaks.end(), 0.0f);
_current_frames = 0;
}
std::vector<float>
LevelCalculator::get(dcpomatic::DCPTime time)
{
boost::mutex::scoped_lock slm(_store_mutex);
auto iter = _peaks.begin();
optional<dcpomatic::DCPTime> last_delta;
std::list<Measurement>::iterator last_iter;
while (iter != _peaks.end()) {
auto const delta = dcpomatic::DCPTime(time - iter->time).abs();
if (last_delta) {
if (delta > *last_delta) {
/* This is worse than the last - use the last one */
return last_iter->value;
} else {
/* This is better - keep looking */
_peaks.erase(last_iter);
}
}
last_delta = delta;
last_iter = iter;
++iter;
}
if (iter == _peaks.end()) {
return {};
}
return iter->value;
}
void
LevelCalculator::enable(bool e)
{
_enabled = e;
}
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