Settings.cpp

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// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#include <algorithm>
#include <cstdlib>
#include <omp.h>
#include "Settings.h"
 
using namespace openshot;
 
// Global reference to Settings
Settings *Settings::m_pInstance = nullptr;
 
int Settings::EffectiveOMPThreads() const
{
    return std::clamp(OMP_THREADS, 2, MaxAllowedThreads());
}
 
int Settings::MaxAllowedThreads() const
{
    return std::max(2, std::max(2, omp_get_num_procs()) * 3);
}
 
void Settings::ApplyOpenMPSettings()
{
    const int requested_threads = EffectiveOMPThreads();
    if (applied_omp_threads != requested_threads) {
        omp_set_num_threads(requested_threads);
        applied_omp_threads = requested_threads;
    }
}
 
// Create or Get an instance of the settings singleton
Settings *Settings::Instance()
{
    if (!m_pInstance) {
        // Create the actual instance of Settings only once
        m_pInstance = new Settings;
        const int machine_threads = std::max(2, omp_get_num_procs());
        m_pInstance->default_omp_threads = machine_threads;
        m_pInstance->default_ff_threads = machine_threads;
        m_pInstance->OMP_THREADS = machine_threads;
        m_pInstance->FF_THREADS = machine_threads;
        auto env_debug = std::getenv("LIBOPENSHOT_DEBUG");
        if (env_debug != nullptr)
            m_pInstance->DEBUG_TO_STDERR = true;
    }
 
    m_pInstance->ApplyOpenMPSettings();
 
    return m_pInstance;
}