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"
29 ParameterDescriptor::ParameterDescriptor(const Evoral::Parameter& parameter)
30 : Evoral::ParameterDescriptor()
32 , datatype(Variant::NOTHING)
33 , type((AutomationType)parameter.type())
38 , integer_step(parameter.type() >= MidiCCAutomation &&
39 parameter.type() <= MidiChannelPressureAutomation)
46 switch((AutomationType)parameter.type()) {
48 upper = Config->get_max_gain();
56 case PanAzimuthAutomation:
57 normal = 0.5f; // there really is no _normal but this works for stereo, sort of
60 case PanWidthAutomation:
65 case RecEnableAutomation:
70 case PluginAutomation:
71 case FadeInAutomation:
72 case FadeOutAutomation:
73 case EnvelopeAutomation:
83 case MidiCCAutomation:
84 case MidiPgmChangeAutomation:
85 case MidiChannelPressureAutomation:
90 case MidiPitchBenderAutomation:
102 ParameterDescriptor::ParameterDescriptor()
103 : Evoral::ParameterDescriptor()
105 , datatype(Variant::NOTHING)
110 , integer_step(false)
112 , sr_dependent(false)
119 ParameterDescriptor::update_steps()
121 if (unit == ParameterDescriptor::MIDI_NOTE) {
122 step = smallstep = 1; // semitone
123 largestep = 12; // octave
124 } else if (type == GainAutomation || type == TrimAutomation) {
125 /* dB_coeff_step gives a step normalized for [0, max_gain]. This is
126 like "slider position", so we convert from "slider position" to gain
127 to have the correct unit here. */
128 largestep = slider_position_to_gain(dB_coeff_step(upper));
129 step = slider_position_to_gain(largestep / 10.0);
132 const float delta = upper - lower;
134 /* 30 happens to be the total number of steps for a fader with default
135 max gain of 2.0 (6 dB), so we use 30 here too for consistency. */
136 step = smallstep = (delta / 300.0f);
137 largestep = (delta / 30.0f);
140 /* Steps are linear, but we map them with pow like values (in
141 internal_to_interface). Thus, they are applied exponentially,
142 which means too few steps. So, divide to get roughly the
143 desired number of steps (30). This is not mathematically
144 precise but seems to be about right for the controls I tried.
145 If you're reading this, you've probably found a case where that
146 isn't true, and somebody needs to sit down with a piece of paper
147 and actually do the math. */
148 smallstep = smallstep / logf(30.0f);
149 step = step / logf(30.0f);
150 largestep = largestep / logf(30.0f);
151 } else if (integer_step) {
152 smallstep = std::max(1.0, rint(smallstep));
153 step = std::max(1.0, rint(step));
154 largestep = std::max(1.0, rint(largestep));
159 } // namespace ARDOUR