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/*
Copyright (C) 2014 Paul Davis
Author: David Robillard
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ardour_parameter_descriptor_h__
#define __ardour_parameter_descriptor_h__
#include "ardour/variant.h"
#include "evoral/Parameter.hpp"
namespace ARDOUR {
typedef std::map<const std::string, const float> ScalePoints;
/** Descriptor of a parameter or control.
*
* Essentially a union of LADSPA, VST and LV2 info.
*/
struct ParameterDescriptor
{
enum Unit {
NONE, ///< No unit
DB, ///< Decibels
MIDI_NOTE, ///< MIDI note number
HZ, ///< Frequency in Hertz
};
ParameterDescriptor(const Evoral::Parameter& parameter)
: key((uint32_t)-1)
, datatype(Variant::NOTHING)
, unit(NONE)
, normal(parameter.normal())
, lower(parameter.min())
, upper(parameter.max())
, step(0)
, smallstep(0)
, largestep(0)
, integer_step(parameter.type() >= MidiCCAutomation &&
parameter.type() <= MidiChannelPressureAutomation)
, toggled(parameter.toggled())
, logarithmic(false)
, sr_dependent(false)
, min_unbound(0)
, max_unbound(0)
, enumeration(false)
{
if (parameter.type() == GainAutomation) {
unit = DB;
}
update_steps();
}
ParameterDescriptor()
: key((uint32_t)-1)
, datatype(Variant::NOTHING)
, unit(NONE)
, normal(0)
, lower(0)
, upper(0)
, step(0)
, smallstep(0)
, largestep(0)
, integer_step(false)
, toggled(false)
, logarithmic(false)
, sr_dependent(false)
, min_unbound(0)
, max_unbound(0)
, enumeration(false)
{}
/* Set step, smallstep, and largestep, based on current description */
void update_steps() {
if (unit == ParameterDescriptor::MIDI_NOTE) {
step = smallstep = 1; // semitone
largestep = 12; // octave
} else if (integer_step) {
const float delta = upper - lower;
smallstep = delta / 10000.0f;
step = delta / 1000.0f;
largestep = delta / 40.0f;
smallstep = std::max(1.0, rint(smallstep));
step = std::max(1.0, rint(step));
largestep = std::max(1.0, rint(largestep));
}
/* else: leave all others as default '0'
* in that case the UI (eg. AutomationController::create)
* uses internal_to_interface() to map the value
* to an appropriate interface range
*/
}
std::string label;
std::string print_fmt; ///< format string for pretty printing
boost::shared_ptr<ScalePoints> scale_points;
uint32_t key; ///< for properties
Variant::Type datatype; ///< for properties
Unit unit;
float normal;
float lower; ///< for frequencies, this is in Hz (not a fraction of the sample rate)
float upper; ///< for frequencies, this is in Hz (not a fraction of the sample rate)
float step;
float smallstep;
float largestep;
bool integer_step;
bool toggled;
bool logarithmic;
bool sr_dependent;
bool min_unbound;
bool max_unbound;
bool enumeration;
};
} // namespace ARDOUR
#endif // __ardour_parameter_descriptor_h__
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