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 #ifndef __ardour_parameter_descriptor_h__
21 #define __ardour_parameter_descriptor_h__
23 #include "ardour/variant.h"
24 #include "evoral/Parameter.hpp"
28 typedef std::map<const std::string, const float> ScalePoints;
30 /** Descriptor of a parameter or control.
32 * Essentially a union of LADSPA, VST and LV2 info.
34 struct ParameterDescriptor
39 MIDI_NOTE, ///< MIDI note number
40 HZ, ///< Frequency in Hertz
43 ParameterDescriptor(const Evoral::Parameter& parameter)
45 , datatype(Variant::NOTHING)
47 , normal(parameter.normal())
48 , lower(parameter.min())
49 , upper(parameter.max())
53 , integer_step(parameter.type() >= MidiCCAutomation &&
54 parameter.type() <= MidiChannelPressureAutomation)
55 , toggled(parameter.toggled())
62 if (parameter.type() == GainAutomation) {
70 , datatype(Variant::NOTHING)
87 /* Set step, smallstep, and largestep, based on current description */
89 if (unit == ParameterDescriptor::MIDI_NOTE) {
90 step = smallstep = 1; // semitone
91 largestep = 12; // octave
92 } else if (integer_step) {
93 const float delta = upper - lower;
95 smallstep = delta / 10000.0f;
96 step = delta / 1000.0f;
97 largestep = delta / 40.0f;
99 smallstep = std::max(1.0, rint(smallstep));
100 step = std::max(1.0, rint(step));
101 largestep = std::max(1.0, rint(largestep));
103 /* else: leave all others as default '0'
104 * in that case the UI (eg. AutomationController::create)
105 * uses internal_to_interface() to map the value
106 * to an appropriate interface range
111 std::string print_fmt; ///< format string for pretty printing
112 boost::shared_ptr<ScalePoints> scale_points;
113 uint32_t key; ///< for properties
114 Variant::Type datatype; ///< for properties
117 float lower; ///< for frequencies, this is in Hz (not a fraction of the sample rate)
118 float upper; ///< for frequencies, this is in Hz (not a fraction of the sample rate)
131 } // namespace ARDOUR
133 #endif // __ardour_parameter_descriptor_h__