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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.
*/
#include "ardour/amp.h"
#include "ardour/dB.h"
#include "ardour/parameter_descriptor.h"
#include "ardour/rc_configuration.h"
#include "ardour/types.h"
#include "ardour/utils.h"
namespace ARDOUR {
ParameterDescriptor::ParameterDescriptor(const Evoral::Parameter& parameter)
: Evoral::ParameterDescriptor()
, key((uint32_t)-1)
, datatype(Variant::NOTHING)
, type((AutomationType)parameter.type())
, unit(NONE)
, step(0)
, smallstep(0)
, largestep(0)
, integer_step(parameter.type() >= MidiCCAutomation &&
parameter.type() <= MidiChannelPressureAutomation)
, logarithmic(false)
, sr_dependent(false)
, min_unbound(0)
, max_unbound(0)
, enumeration(false)
{
switch((AutomationType)parameter.type()) {
case GainAutomation:
upper = Config->get_max_gain();
normal = 1.0f;
break;
case PanAzimuthAutomation:
normal = 0.5f; // there really is no _normal but this works for stereo, sort of
upper = 1.0f;
break;
case PanWidthAutomation:
lower = -1.0;
upper = 1.0;
normal = 0.0f;
break;
case RecEnableAutomation:
lower = 0.0;
upper = 1.0;
toggled = true;
break;
case PluginAutomation:
case FadeInAutomation:
case FadeOutAutomation:
case EnvelopeAutomation:
upper = 2.0f;
normal = 1.0f;
break;
case SoloAutomation:
case MuteAutomation:
upper = 1.0f;
normal = 0.0f;
toggled = true;
break;
case MidiCCAutomation:
case MidiPgmChangeAutomation:
case MidiChannelPressureAutomation:
lower = 0.0;
normal = 0.0;
upper = 127.0;
break;
case MidiPitchBenderAutomation:
lower = 0.0;
normal = 8192.0;
upper = 16383.0;
break;
default:
break;
}
update_steps();
}
ParameterDescriptor::ParameterDescriptor()
: Evoral::ParameterDescriptor()
, key((uint32_t)-1)
, datatype(Variant::NOTHING)
, unit(NONE)
, step(0)
, smallstep(0)
, largestep(0)
, integer_step(false)
, logarithmic(false)
, sr_dependent(false)
, min_unbound(0)
, max_unbound(0)
, enumeration(false)
{}
void
ParameterDescriptor::update_steps()
{
if (unit == ParameterDescriptor::MIDI_NOTE) {
step = smallstep = 1; // semitone
largestep = 12; // octave
} else if (type == GainAutomation) {
/* dB_coeff_step gives a step normalized for [0, max_gain]. This is
like "slider position", so we convert from "slider position" to gain
to have the correct unit here. */
largestep = slider_position_to_gain(dB_coeff_step(upper));
step = slider_position_to_gain(largestep / 10.0);
smallstep = step;
} else {
const float delta = upper - lower;
/* 30 happens to be the total number of steps for a fader with default
max gain of 2.0 (6 dB), so we use 30 here too for consistency. */
step = smallstep = (delta / 300.0f);
largestep = (delta / 30.0f);
if (logarithmic) {
/* Compensate for internal_to_interface's pow so we get roughly the
desired number of steps. */
smallstep = pow(smallstep, 1.5f);
step = pow(step, 1.5f);
largestep = pow(largestep, 1.5f);
} else if (integer_step) {
smallstep = std::max(1.0, rint(smallstep));
step = std::max(1.0, rint(step));
largestep = std::max(1.0, rint(largestep));
}
}
}
} // namespace ARDOUR
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