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/*
* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "ardour/dsp_load_calculator.h"
namespace ARDOUR {
void
DSPLoadCalculator::set_stop_timestamp_us(int64_t stop_timestamp_us)
{
m_stop_timestamp_us = stop_timestamp_us;
/* querying the performance counter can fail occasionally (-1).
* Also on some multi-core systems, timers are CPU specific and not
* synchronized. We assume they differ more than a few milliseconds
* (4 * nominal cycle time) and simply ignore cases where the
* execution switches cores.
*/
if (m_start_timestamp_us < 0 || m_stop_timestamp_us < 0 ||
m_start_timestamp_us > m_stop_timestamp_us ||
elapsed_time_us() > max_timer_error()) {
return;
}
if (elapsed_time_us() > m_max_time_us) {
m_dsp_load = 1.0f;
} else {
const float load = elapsed_time_us() / (float)m_max_time_us;
if (load > m_dsp_load) {
m_dsp_load = load;
} else {
const float alpha = 0.2f * (m_max_time_us * 1e-6f);
m_dsp_load = m_dsp_load + alpha * (load - m_dsp_load) + 1e-12;
}
}
}
} // namespace ARDOUR
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