Add DSPLoadCalculator class to libardour
This is similar to the class in the PortaudioBackend but uses an average of the values if raw load is under 80%
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libs/ardour/ardour/dsp_load_calculator.h
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libs/ardour/ardour/dsp_load_calculator.h
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/*
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* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef ARDOUR_DSP_LOAD_CALCULATOR_H
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#define ARDOUR_DSP_LOAD_CALCULATOR_H
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#include <stdint.h>
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#include <cassert>
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#include <algorithm>
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#include <pbd/ringbuffer.h>
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namespace ARDOUR {
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class DSPLoadCalculator {
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public:
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DSPLoadCalculator()
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: m_max_time_us(0)
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, m_start_timestamp_us(0)
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, m_stop_timestamp_us(0)
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, m_dsp_load(0)
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, m_value_history (max_value_history())
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, m_num_values(0)
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{
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}
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void set_max_time_us(uint64_t max_time_us) {
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assert(m_max_time_us != 0);
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m_max_time_us = max_time_us;
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// Use average of last 1/4 second of values so responsiveness
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// remains consistent independent of max time
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uint32_t max_dsp_samples_per_qtr_second = (250000 / m_max_time_us);
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m_num_values =
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std::min(max_value_history() - 1, max_dsp_samples_per_qtr_second);
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m_value_history.reset();
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}
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uint64_t get_max_time_us() const { return m_max_time_us; }
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void set_start_timestamp_us(uint64_t start_timestamp_us)
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{
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m_start_timestamp_us = start_timestamp_us;
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}
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void set_stop_timestamp_us(uint64_t stop_timestamp_us);
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uint64_t elapsed_time_us()
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{
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return m_stop_timestamp_us - m_start_timestamp_us;
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}
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/**
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* @return a decimal value between 0.0 and 1.0 representing the percentage
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* of time spent between start and stop in proportion to the max expected time
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* in microseconds(us).
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*/
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float get_dsp_load() const
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{
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if (m_dsp_load > m_max_time_us) {
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return 1.0f;
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}
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if (m_dsp_load < 0.0f) {
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return 0.0f;
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}
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return m_dsp_load;
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}
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private: // methods
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static uint32_t max_value_history () { return 16; }
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private: // data
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uint64_t m_max_time_us;
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uint64_t m_start_timestamp_us;
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uint64_t m_stop_timestamp_us;
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float m_dsp_load;
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RingBuffer<float> m_value_history;
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uint32_t m_num_values;
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};
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} // namespace ARDOUR
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#endif // ARDOUR_DSP_LOAD_CALCULATOR_H
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80
libs/ardour/dsp_load_calculator.cc
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libs/ardour/dsp_load_calculator.cc
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@ -0,0 +1,80 @@
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/*
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* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "ardour/dsp_load_calculator.h"
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namespace ARDOUR {
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void
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DSPLoadCalculator::set_stop_timestamp_us(uint64_t stop_timestamp_us)
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{
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// We could only bother with calculations if a certain amount of time
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// has passed, or the Raw DSP value is > X% different than last calc
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// which would mean consistent overhead for small values of m_max_time_us
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m_stop_timestamp_us = stop_timestamp_us;
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float load = 0;
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if (elapsed_time_us() > m_max_time_us) {
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load = 1.0f;
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} else {
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load = elapsed_time_us() / (float)m_max_time_us;
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}
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assert(m_value_history.write_space() >= 1);
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// push raw load value onto history
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m_value_history.write(&load, 1);
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// if load is under 80% use an average of past values
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if (elapsed_time_us() < ((m_max_time_us * 80) / 100)) {
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RingBuffer<float>::rw_vector vec;
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m_value_history.get_read_vector(&vec);
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uint32_t values_read = 0;
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float dsp_accumulator = 0.0f;
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// iterate through the read vectors accumulating the dsp load
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for (unsigned int i = 0; i < vec.len[0]; ++i) {
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dsp_accumulator += vec.buf[0][i];
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values_read++;
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}
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for (unsigned int i = 0; i < vec.len[1]; ++i) {
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dsp_accumulator += vec.buf[1][i];
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values_read++;
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}
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load = dsp_accumulator / (float)values_read;
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const float alpha = 0.2f * (m_max_time_us * 1e-6f);
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m_dsp_load = m_dsp_load + alpha * (load - m_dsp_load) + 1e-12;
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} else {
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// Use raw load value otherwise 100% may never be indicated because of
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// averaging/LPF etc
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m_dsp_load = load;
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}
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if (m_value_history.read_space() >= m_num_values) {
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// "remove" the oldest value
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m_value_history.increment_read_idx(1);
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}
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}
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} // namespace ARDOUR
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@ -65,6 +65,7 @@ libardour_sources = [
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'delivery.cc',
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'directory_names.cc',
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'diskstream.cc',
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'dsp_load_calculator.cc',
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'element_import_handler.cc',
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'element_importer.cc',
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'engine_slave.cc',
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