281 lines
8.4 KiB
C++
281 lines
8.4 KiB
C++
/*
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Copyright (C) 1998-2007 Paul Davis
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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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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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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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$Id: volume_controller.cc,v 1.4 2000/05/03 15:54:21 pbd Exp $
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*/
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#include <algorithm>
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#include <string.h>
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#include <limits.h>
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#include "pbd/controllable.h"
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#include "pbd/stacktrace.h"
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#include "gtkmm2ext/gui_thread.h"
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#include "ardour/dB.h"
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#include "ardour/rc_configuration.h"
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#include "ardour/utils.h"
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#include "volume_controller.h"
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using namespace Gtk;
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VolumeController::VolumeController (Glib::RefPtr<Gdk::Pixbuf> p,
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boost::shared_ptr<PBD::Controllable> c,
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double def,
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double step,
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double page,
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bool with_numeric,
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int subw,
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int subh,
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bool linear)
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: MotionFeedback (p, MotionFeedback::Rotary, c, def, step, page, "", with_numeric, subw, subh)
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, _linear (linear)
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{
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set_print_func (VolumeController::_dB_printer, this);
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value->set_width_chars (8);
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}
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void
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VolumeController::_dB_printer (char buf[32], const boost::shared_ptr<PBD::Controllable>& c, void* arg)
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{
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VolumeController* vc = reinterpret_cast<VolumeController*>(arg);
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vc->dB_printer (buf, c);
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}
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void
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VolumeController::dB_printer (char buf[32], const boost::shared_ptr<PBD::Controllable>& c)
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{
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if (c) {
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if (_linear) {
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double val = accurate_coefficient_to_dB (c->get_value());
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if (step_inc < 1.0) {
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if (val >= 0.0) {
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snprintf (buf, 32, "+%5.2f dB", val);
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} else {
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snprintf (buf, 32, "%5.2f dB", val);
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}
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} else {
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if (val >= 0.0) {
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snprintf (buf, 32, "+%2ld dB", lrint (val));
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} else {
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snprintf (buf, 32, "%2ld dB", lrint (val));
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}
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}
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} else {
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double dB = accurate_coefficient_to_dB (c->get_value());
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if (step_inc < 1.0) {
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if (dB >= 0.0) {
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snprintf (buf, 32, "+%5.2f dB", dB);
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} else {
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snprintf (buf, 32, "%5.2f dB", dB);
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}
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} else {
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if (dB >= 0.0) {
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snprintf (buf, 32, "+%2ld dB", lrint (dB));
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} else {
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snprintf (buf, 32, "%2ld dB", lrint (dB));
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}
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}
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}
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} else {
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snprintf (buf, 32, "--");
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}
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}
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double
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VolumeController::to_control_value (double display_value)
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{
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double v;
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/* display value is always clamped to 0.0 .. 1.0 */
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display_value = std::max (0.0, std::min (1.0, display_value));
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if (_linear) {
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v = _controllable->lower() + ((_controllable->upper() - _controllable->lower()) * display_value);
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} else {
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v = ARDOUR::slider_position_to_gain_with_max (display_value, ARDOUR::Config->get_max_gain());
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}
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return v;
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}
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double
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VolumeController::to_display_value (double control_value)
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{
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double v;
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if (_linear) {
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v = (control_value - _controllable->lower ()) / (_controllable->upper() - _controllable->lower());
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} else {
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v = ARDOUR::gain_to_slider_position_with_max (control_value, _controllable->upper());
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}
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return v;
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}
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double
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VolumeController::adjust (double control_delta)
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{
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double v;
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if (!_linear) {
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/* we map back into the linear/fractional slider position,
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* because this kind of control goes all the way down
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* to -inf dB, and we want this occur in a reasonable way in
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* terms of user interaction. if we leave the adjustment in the
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* gain coefficient domain (or dB domain), the lower end of the
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* control range (getting close to -inf dB) takes forever.
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*/
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#if 0
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/* convert to linear/fractional slider position domain */
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v = ARDOUR::gain_to_slider_position_with_max (_controllable->get_value (), _controllable->upper());
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/* increment in this domain */
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v += control_delta;
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/* clamp to appropriate range for linear/fractional slider domain */
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v = std::max (0.0, std::min (1.0, v));
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/* convert back to gain coefficient domain */
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v = ARDOUR::slider_position_to_gain_with_max (v, _controllable->upper());
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/* clamp in controller domain */
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v = std::max (_controllable->lower(), std::min (_controllable->upper(), v));
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/* convert to dB domain */
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v = accurate_coefficient_to_dB (v);
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/* round up/down to nearest 0.1dB */
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if (control_delta > 0.0) {
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v = ceil (v * 10.0) / 10.0;
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} else {
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v = floor (v * 10.0) / 10.0;
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}
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/* and return it */
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return dB_to_coefficient (v);
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#else
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/* ^^ Above algorithm is not symmetric. Scroll up to steps, scoll down two steps, -> different gain.
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*
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* see ./libs/gtkmm2ext/gtkmm2ext/motionfeedback.h and gtk2_ardour/monitor_section.cc:
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* min-delta (corr) = MIN(0.01 * page inc, 1 * size_inc) // (gain_control uses size_inc=0.01, page_inc=0.1)
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* range corr: 0..2 -> -inf..+6dB
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* step sizes [0.01, 0.10, 0.20] * page_inc, [1,2,10,100] * step_inc. [1,2,10,100] * page_inc
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*
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* 0.001, 0.01, 0.02, 0.1, .2, 1, 10
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* -> 1k steps between -inf..0dB
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* -> 1k steps between 0..+dB
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*
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* IOW:
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* the range is from *0 (-inf dB) to *2.0 ( +6dB)
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* the knob is configured to to go in steps of 0.001 - that's 2000 steps between 0 and 2.
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* or 1000 steps between 0 and 1.
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*
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* we cannot round to .01dB steps because
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* There are only 600 possible values between +0db and +6dB when going in steps of .01dB
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* 1000/600 = 1.66666...
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*
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******
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* idea: make the 'controllable use a fixed range of dB.
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* do a 1:1 mapping between values. :et's stick with the range of 0..2 in 0.001 steps
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*
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* "-80" becomes 0 and "+6" becomes 2000. (NB +6dB is actually 1995, but we clamp that to the top)
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*
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* This approach is better (more consistet) but not good. At least the dial does not annoy me as much
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* anymore as it did before.
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*
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* const double stretchfactor = rint((_controllable->upper() - _controllable->lower()) / 0.001); // 2000;
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* const double logfactor = stretchfactor / ((20.0 * log10( _controllable->upper())) + 80.0); // = 23.250244732
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*/
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v = _controllable->get_value ();
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/* assume everything below -60dB is silent (.001 ^= -60dB)
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* but map range -80db..+6dB to a scale of 0..2000
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* 80db was motivated because 2000/((20.0 * log(1)) + 80.0) is an integer value. "0dB" is included on the scale.
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* but this leaves a dead area at the bottom of the meter..
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*/
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double arange = (v >= 0.001) ? ( ((20.0 * log10(v)) + 80.0) * 23.250244732 ) : ( 0 );
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/* add the delta */
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v = rint(arange) + rint(control_delta * 1000.0); // (min steps is 1.0/0.001 == 1000.0)
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/* catch bottom -80..-60 db in one step */
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if (v < 466) v = (control_delta > 0) ? 0.001 : 0;
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/* reverse operation (pow(10, .05 * ((v / 23.250244732) - 80.0)))
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* can be simplified to :*/
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else v = pow(10, (v * 0.00215051499) - 4.0);
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/* clamp value in coefficient domain */
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v = std::max (_controllable->lower(), std::min (_controllable->upper(), v));
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return v;
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#endif
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} else {
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double mult;
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if (control_delta < 0.0) {
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mult = -1.0;
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} else {
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mult = 1.0;
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}
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if (fabs (control_delta) < 0.05) {
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control_delta = mult * 0.05;
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} else {
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control_delta = mult * 0.1;
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}
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v = _controllable->get_value();
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if (v == 0.0) {
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/* if we don't special case this, we can't escape from
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the -infinity dB black hole.
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*/
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if (control_delta > 0.0) {
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v = dB_to_coefficient (-100 + control_delta);
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}
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} else {
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static const double dB_minus_200 = dB_to_coefficient (-200.0);
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static const double dB_minus_100 = dB_to_coefficient (-100.0);
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static const double dB_minus_50 = dB_to_coefficient (-50.0);
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static const double dB_minus_20 = dB_to_coefficient (-20.0);
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if (control_delta < 0 && v < dB_minus_200) {
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v = 0.0;
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} else {
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/* non-linear scaling as the dB level gets low
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so that we can hit -inf and get back out of
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it appropriately.
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*/
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if (v < dB_minus_100) {
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control_delta *= 1000.0;
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} else if (v < dB_minus_50) {
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control_delta *= 100.0;
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} else if (v < dB_minus_20) {
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control_delta *= 10.0;
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}
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v = accurate_coefficient_to_dB (v);
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v += control_delta;
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v = dB_to_coefficient (v);
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}
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}
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return std::max (_controllable->lower(), std::min (_controllable->upper(), v));
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}
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}
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