2 * Copyright (C) 2014-2017 Robin Gareus <robin@gareus.org>
3 * Copyright (C) 2014 David Robillard <d@drobilla.net>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #ifndef __ardour_parameter_descriptor_h__
21 #define __ardour_parameter_descriptor_h__
23 #include "ardour/types.h"
24 #include "ardour/variant.h"
26 #include "evoral/Parameter.hpp"
27 #include "evoral/ParameterDescriptor.hpp"
31 typedef std::map<const std::string, const float> ScalePoints;
33 /** Descriptor of a parameter or control.
35 * Essentially a union of LADSPA, VST and LV2 info.
37 struct LIBARDOUR_API ParameterDescriptor : public Evoral::ParameterDescriptor
42 MIDI_NOTE, ///< MIDI note number
43 HZ, ///< Frequency in Hertz
46 static std::string midi_note_name (uint8_t, bool translate=true);
48 /** Dual of midi_note_name, convert a note name into its midi note number. */
49 typedef std::map<std::string, uint8_t> NameNumMap;
50 static std::string normalize_note_name(const std::string& name);
51 static NameNumMap build_midi_name2num();
52 static uint8_t midi_note_num (const std::string& name);
54 ParameterDescriptor(const Evoral::Parameter& parameter);
56 ParameterDescriptor();
58 /** control-value to normalized [0..1] range
60 * Convert given AutomationType from lower/upper range to [0..1]
61 * interface value, using settings from Evoral::ParameterDescriptor.
63 * default for AutomationControl::internal_to_interface ();
65 * @param v the control-value to convert
66 * @param rotary set to true if the GUI control is a rotary knob
67 * @return interface value in range 0..1
69 float to_interface (float v, bool rotary = false) const;
71 /** normalized [0..1] to control-value range
73 * Convert [0..1] to the control's range of this AutomationType
74 * using settings from Evoral::ParameterDescriptor.
76 * default for AutomationControl::interface_to_internal ();
78 * @param v the value in range 0..1 to on convert
79 * @param rotary set to true if the GUI control is a rotary knob
80 * @return control-value in range lower..upper
82 float from_interface (float v, bool rotary = false) const;
84 bool is_linear () const;
85 float compute_delta (float from, float to) const;
86 float apply_delta (float value, float delta) const;
88 /* find the closest scale-point, return the internal value of
89 * the prev/next scale-point (no wrap-around)
91 * If the given parameter is not en enum, the given val is returned.
93 * @param val internal (not interface) value
94 * @param prev if true, step to prev scale-point, otherwise next
95 * @return internal value, suitable for set_value()
97 float step_enum (float val, bool prev) const;
99 /** Set step, smallstep, and largestep, based on current description. */
103 std::string print_fmt; ///< format string for pretty printing
104 boost::shared_ptr<ScalePoints> scale_points;
105 uint32_t key; ///< for properties
106 Variant::Type datatype; ///< for properties
117 } // namespace ARDOUR
119 #endif // __ardour_parameter_descriptor_h__