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)
106 , type(NullAutomation)
111 , integer_step(false)
113 , sr_dependent(false)
120 ParameterDescriptor::update_steps()
122 if (unit == ParameterDescriptor::MIDI_NOTE) {
123 step = smallstep = 1; // semitone
124 largestep = 12; // octave
125 } else if (type == GainAutomation || type == TrimAutomation) {
126 /* dB_coeff_step gives a step normalized for [0, max_gain]. This is
127 like "slider position", so we convert from "slider position" to gain
128 to have the correct unit here. */
129 largestep = slider_position_to_gain(dB_coeff_step(upper));
130 step = slider_position_to_gain(largestep / 10.0);
133 const float delta = upper - lower;
135 /* 30 happens to be the total number of steps for a fader with default
136 max gain of 2.0 (6 dB), so we use 30 here too for consistency. */
137 step = smallstep = (delta / 300.0f);
138 largestep = (delta / 30.0f);
141 /* Steps are linear, but we map them with pow like values (in
142 internal_to_interface). Thus, they are applied exponentially,
143 which means too few steps. So, divide to get roughly the
144 desired number of steps (30). This is not mathematically
145 precise but seems to be about right for the controls I tried.
146 If you're reading this, you've probably found a case where that
147 isn't true, and somebody needs to sit down with a piece of paper
148 and actually do the math. */
149 smallstep = smallstep / logf(30.0f);
150 step = step / logf(30.0f);
151 largestep = largestep / logf(30.0f);
152 } else if (integer_step) {
154 step = std::max(1.0, rint(step));
155 largestep = std::max(1.0, rint(largestep));
160 } // namespace ARDOUR