2 Copyright (C) 2014 Paul Davis
3 Author: David Robillard
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the Free
7 Software Foundation; either version 2 of the License, or (at your option)
10 This program is distributed in the hope that it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include "ardour/amp.h"
21 #include "ardour/dB.h"
22 #include "ardour/parameter_descriptor.h"
23 #include "ardour/rc_configuration.h"
24 #include "ardour/types.h"
25 #include "ardour/utils.h"
31 ParameterDescriptor::ParameterDescriptor(const Evoral::Parameter& parameter)
32 : Evoral::ParameterDescriptor()
34 , datatype(Variant::NOTHING)
35 , type((AutomationType)parameter.type())
40 , integer_step(parameter.type() >= MidiCCAutomation &&
41 parameter.type() <= MidiChannelPressureAutomation)
50 switch((AutomationType)parameter.type()) {
52 upper = Config->get_max_gain();
56 upper = Config->get_max_gain ();
68 case PanAzimuthAutomation:
69 normal = 0.5f; // there really is no _normal but this works for stereo, sort of
72 case PanWidthAutomation:
77 case RecEnableAutomation:
82 case PluginAutomation:
83 case FadeInAutomation:
84 case FadeOutAutomation:
85 case EnvelopeAutomation:
95 case MidiCCAutomation:
96 case MidiPgmChangeAutomation:
97 case MidiChannelPressureAutomation:
102 case MidiPitchBenderAutomation:
107 case PhaseAutomation:
110 case MonitoringAutomation:
114 upper = MonitorDisk; /* XXX bump when we add MonitorCue */
116 case SoloIsolateAutomation:
119 case SoloSafeAutomation:
129 ParameterDescriptor::ParameterDescriptor()
130 : Evoral::ParameterDescriptor()
132 , datatype(Variant::NOTHING)
133 , type(NullAutomation)
138 , integer_step(false)
140 , sr_dependent(false)
147 ParameterDescriptor::update_steps()
149 if (unit == ParameterDescriptor::MIDI_NOTE) {
150 step = smallstep = 1; // semitone
151 largestep = 12; // octave
152 } else if (type == GainAutomation || type == TrimAutomation) {
153 /* dB_coeff_step gives a step normalized for [0, max_gain]. This is
154 like "slider position", so we convert from "slider position" to gain
155 to have the correct unit here. */
156 largestep = slider_position_to_gain(dB_coeff_step(upper));
157 step = slider_position_to_gain(largestep / 10.0);
160 const float delta = upper - lower;
162 /* 30 happens to be the total number of steps for a fader with default
163 max gain of 2.0 (6 dB), so we use 30 here too for consistency. */
164 step = smallstep = (delta / 300.0f);
165 largestep = (delta / 30.0f);
168 /* Steps are linear, but we map them with pow like values (in
169 internal_to_interface). Thus, they are applied exponentially,
170 which means too few steps. So, divide to get roughly the
171 desired number of steps (30). This is not mathematically
172 precise but seems to be about right for the controls I tried.
173 If you're reading this, you've probably found a case where that
174 isn't true, and somebody needs to sit down with a piece of paper
175 and actually do the math. */
176 smallstep = smallstep / logf(30.0f);
177 step = step / logf(30.0f);
178 largestep = largestep / logf(30.0f);
179 } else if (integer_step) {
181 step = std::max(1.f, rintf (step));
182 largestep = std::max(1.f, rintf (largestep));
187 } // namespace ARDOUR