100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
// ------------------------------------------------------------------------
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// two-stage-linear-envelope.cpp: Two-stage linear envelope
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// Copyright (C) 2000-2002,2005,2008 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 <kvu_dbc.h>
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#include <kvu_numtostr.h>
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#include <kvu_message_item.h>
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#include "two-stage-linear-envelope.h"
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#include "eca-logger.h"
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CONTROLLER_SOURCE::parameter_t TWO_STAGE_LINEAR_ENVELOPE::value(double pos_secs)
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{
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parameter_t stages_len =
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first_stage_length_rep +
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second_stage_length_rep;
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parameter_t retval;
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/* note: position may go beyond stages_len_rep */
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/* phase: hold start value */
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if (pos_secs < first_stage_length_rep) {
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retval = 0.0f;
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}
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/* phase: linear fade */
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else if (pos_secs < stages_len) {
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DBC_CHECK(second_stage_length_rep > 0);
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retval = ((pos_secs - first_stage_length_rep) /
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second_stage_length_rep);
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}
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/* phase: hold end value */
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else
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retval = 1.0;
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return retval;
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}
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TWO_STAGE_LINEAR_ENVELOPE::TWO_STAGE_LINEAR_ENVELOPE(void)
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{
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first_stage_length_rep = 0;
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second_stage_length_rep = 0;
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}
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void TWO_STAGE_LINEAR_ENVELOPE::init(void)
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{
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MESSAGE_ITEM otemp;
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otemp << "Two-stage envelope initialized: ";
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otemp.setprecision(3);
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otemp << "1. initial hold " << get_parameter(1)
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<< "secs, 2. linear ramp len " << get_parameter(2)
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<< "secs.";
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ECA_LOG_MSG(ECA_LOGGER::user_objects, otemp.to_string());
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}
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void TWO_STAGE_LINEAR_ENVELOPE::set_parameter(int param, CONTROLLER_SOURCE::parameter_t value)
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{
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switch (param) {
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case 1:
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{
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first_stage_length_rep = value;
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break;
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}
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case 2:
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{
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second_stage_length_rep = value;
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break;
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}
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}
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}
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CONTROLLER_SOURCE::parameter_t TWO_STAGE_LINEAR_ENVELOPE::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 first_stage_length_rep;
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case 2:
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return second_stage_length_rep;
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}
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return 0.0;
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}
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