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/*
leqm-nrt is a non-real-time implementation
of Leq(M) measurement according to ISO 21727:2004(E)
"Cinematography -- Method of measurement of perceived
loudness of motion-picture audio material"
Copyright (C) 2011-2013, 2017-2018 Luca Trisciani
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <boost/asio.hpp>
#include <string>
#include <vector>
#include <functional>
#include <stdexcept>
#include <mutex>
#include <cmath>
#include <memory>
namespace leqm_nrt {
class Sum
{
public:
void sum_samples(std::vector<double> const& input_samples, std::vector<double> const& c_input_samples, int nsamples)
{
_mutex.lock();
_nsamples += nsamples;
for (auto i = 0; i < nsamples; i++) {
_sum += input_samples[i];
_csum += c_input_samples[i];
}
_mutex.unlock();
}
int nsamples() const
{
return _nsamples;
}
/*
How the final offset is calculated without reference to a test tone:
P0 is the SPL reference 20 uPa
Reference SPL is RMS ! So 85 SPL over 20 uPa is 10^4.25 x 0.000020 = 0.355655882 Pa (RMS),
but Peak value is 0.355655882 x sqr(2) = 0.502973372 that is 20 x log ( 0.502973372 / 0.000020) = 88.010299957
To that one has to add the 20 dB offset of the reference -20dBFS: 88.010299957 + 20.00 = 108.010299957
But ISO 21727:2004(E) ask for a reference level "measured using an average responding meter". So reference level is not 0.707, but 0.637 = 2/pi
*/
double rms() const
{
return 20 * log10(mean()) + 108.010299957;
}
double leqm() const
{
return 20 * log10(cmean()) + 108.010299957;
}
private:
double mean() const
{
return pow(_sum / _nsamples, 0.500);
}
double cmean() const
{
return pow(_csum / _nsamples, 0.500);
}
double _csum = 0.0; // convolved sum
double _sum = 0.0; // flat sum
int _nsamples = 0;
std::mutex _mutex;
};
struct Result
{
Result(int status_)
: status(status_)
{}
Result(double leq_m_, double leq_nw_)
: status(0)
, leq_m(leq_m_)
, leq_nw(leq_nw_)
{}
/** 0 on success, or
*
* -100: Either channel_corrections contained a different number of
* calibrations than; number of channels in the file or it was empty and the
* program cannot infer one from the number of channels. Please specify a
* values in channel_corrections.
*
* -101: Failed to open the sound file.
*
* -102: buffer_size_ms is not an integer number of samples at the sound file's rate.
*/
int status;
double leq_m;
double leq_nw;
};
#ifdef LEQM_NRT_WITH_LIBSNDFILE
Result calculate_file(
std::string sound_filename,
std::vector<double> channel_corrections,
int buffer_size_ms,
int number_of_filter_interpolation_points,
int num_cpu
);
#endif
double convert_log_to_linear_single(double in);
class BadBufferSizeError : public std::runtime_error
{
public:
BadBufferSizeError()
: std::runtime_error("Buffer size does not correspond to an integer number of samples")
{}
};
class BadChannelCorrectionsError : public std::runtime_error
{
public:
BadChannelCorrectionsError()
: std::runtime_error("Incorrect number of channel corrections given, and no defaults are available")
{}
};
class Calculator
{
public:
Calculator(
int channels,
int sample_rate,
int bits_per_sample,
std::vector<double> channel_corrections,
int buffer_size_ms,
int number_of_filter_interpolation_points,
int num_cpu
);
~Calculator()
{
_pool.join();
}
Calculator(Calculator&) = delete;
Calculator(Calculator&&) = delete;
bool operator=(Calculator&) = delete;
bool operator=(Calculator&&) = delete;
void add(std::vector<double> samples);
double leq_m();
double leq_nw();
private:
void process_buffer();
int _channels;
std::vector<double> _channel_corrections;
int _num_cpu;
boost::asio::thread_pool _pool;
Sum _sum;
std::vector<double> _ir;
std::vector<double> _buffer;
size_t _buffer_free_offset = 0;
};
}
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