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livetrax/libs/surfaces/mackie/meter.cc
Ben Loftis ec365820d8
MCU/UF8: reuse and special-case Mackie ctrl surface for SSL-UF8
This adds a unique namespace to the MCU source code, so it can be
compiled multiple times resulting in different ctrl surfaces.
2023-08-24 19:19:10 +02:00

136 lines
3.3 KiB
C++

/*
* Copyright (C) 2006-2007 John Anderson
* Copyright (C) 2012-2016 Paul Davis <paul@linuxaudiosystems.com>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <cmath>
#include "pbd/compose.h"
#include "ardour/debug.h"
#include "meter.h"
#include "surface.h"
#include "surface_port.h"
#include "control_group.h"
#include "mackie_control_protocol.h"
using namespace PBD;
using namespace ArdourSurface;
using namespace ArdourSurface::MACKIE_NAMESPACE;
Control*
Meter::factory (Surface& surface, int id, const char* name, Group& group)
{
Meter* m = new Meter (id, name, group);
surface.meters[id] = m;
surface.controls.push_back (m);
group.add (*m);
return m;
}
void
Meter::notify_metering_state_changed(Surface& surface, bool transport_is_rolling, bool metering_active)
{
MidiByteArray msg;
// sysex header
msg << surface.sysex_hdr();
// code for Channel Meter Enable Message
msg << 0x20;
// Channel identification
msg << id();
// Enable (0x07) / Disable (0x00) level meter on LCD, peak hold display on horizontal meter and signal LED
_enabled = ((surface.mcp().device_info().has_separate_meters() || transport_is_rolling) && metering_active);
msg << (_enabled ? 0x07 : 0x00);
// sysex trailer
msg << MIDI::eox;
surface.write (msg);
}
void
Meter::send_update (Surface& surface, float dB)
{
std::pair<bool,float> result = calculate_meter_over_and_deflection(dB);
MidiByteArray msg;
if (result.first) {
if (!overload_on) {
overload_on = true;
surface.write (MidiByteArray (2, 0xd0, (id() << 4) | 0xe));
}
} else {
if (overload_on) {
overload_on = false;
surface.write (MidiByteArray (2, 0xd0, (id() << 4) | 0xf));
}
}
/* we can use up to 13 segments */
int segment = lrintf ((result.second/115.0) * 13.0);
surface.write (MidiByteArray (2, 0xd0, (id()<<4) | segment));
}
MidiByteArray
Meter::zero ()
{
return MidiByteArray (2, 0xD0, (id()<<4 | 0));
}
std::pair<bool, float>
Meter::calculate_meter_over_and_deflection (float dB)
{
float def = 0.0f; /* Meter deflection %age */
bool over = false;
if (dB < -70.0f) {
def = 0.0f;
} else if (dB < -60.0f) {
def = (dB + 70.0f) * 0.25f;
} else if (dB < -50.0f) {
def = (dB + 60.0f) * 0.5f + 2.5f;
} else if (dB < -40.0f) {
def = (dB + 50.0f) * 0.75f + 7.5f;
} else if (dB < -30.0f) {
def = (dB + 40.0f) * 1.5f + 15.0f;
} else if (dB < -20.0f) {
def = (dB + 30.0f) * 2.0f + 30.0f;
} else if (dB < 6.0f) {
def = (dB + 20.0f) * 2.5f + 50.0f;
} else {
def = 115.0f;
}
/* 115 is the deflection %age that would be
when dB=6.0. this is an arbitrary
endpoint for our scaling.
*/
if (def > 100.0f) {
over = true;
}
return std::make_pair (over, def);
}