92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
// ------------------------------------------------------------------------
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// osc-sine.cpp: Sine oscillator
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// Copyright (C) 1999,2001,2008 Kai Vehmanen
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//
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// Attributes:
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// eca-style-version: 3 (see Ecasound Programmer's Guide)
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//
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// This program is fre 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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// ------------------------------------------------------------------------
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#include <cmath>
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#include <kvu_numtostr.h>
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#include <kvu_message_item.h>
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#include "oscillator.h"
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#include "osc-sine.h"
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#include "eca-logger.h"
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CONTROLLER_SOURCE::parameter_t SINE_OSCILLATOR::value(double pos_secs)
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{
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parameter_t retval, phase;
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phase = 2.0 * M_PI * (pos_secs / period_len_rep);
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retval = sin(phase + phase_offset());
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/* note: scale return value to proper [0,1] range */
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retval += 1.0;
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retval /= 2.0;
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return retval;
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}
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SINE_OSCILLATOR::SINE_OSCILLATOR (double freq, double initial_phase) :
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OSCILLATOR(freq, initial_phase)
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{
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set_parameter(1, get_parameter(1));
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set_parameter(2, get_parameter(2));
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}
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void SINE_OSCILLATOR::init(void)
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{
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MESSAGE_ITEM otemp;
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otemp << "Sine oscillator created; frequency ";
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otemp.setprecision(3);
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otemp << frequency();
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otemp << " and initial phase of ";
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otemp << phase_offset() << ".";
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ECA_LOG_MSG(ECA_LOGGER::user_objects, otemp.to_string());
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}
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void SINE_OSCILLATOR::set_parameter(int param, CONTROLLER_SOURCE::parameter_t v)
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{
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switch (param) {
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case 1:
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frequency(v);
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/* note: cache length of one period in seconds */
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if (v > 0)
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period_len_rep = 1.0 / frequency();
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else
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period_len_rep = 0;
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break;
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case 2:
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phase_offset(static_cast<double>(v * M_PI));
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break;
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}
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}
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CONTROLLER_SOURCE::parameter_t SINE_OSCILLATOR::get_parameter(int param) const
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{
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switch (param) {
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case 1:
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return frequency();
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case 2:
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return phase_offset() / M_PI;
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}
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return(0.0);
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}
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