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/*
Copyright (C) 2006,2007 John Anderson
Copyright (C) 2012 Paul Davis
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 <cmath>
#include "pbd/compose.h"
#include "ardour/debug.h"
#include "meter.h"
#include "surface.h"
#include "surface_port.h"
#include "control_group.h"
using namespace PBD;
using namespace ArdourSurface;
using namespace Mackie;
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 = (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)
{
float def = 0.0f; /* Meter deflection %age */
// DEBUG_TRACE (DEBUG::MackieControl, string_compose ("Meter ID %1 dB %2\n", id(), dB));
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.
*/
MidiByteArray msg;
if (def > 100.0f) {
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 ((def/115.0) * 13.0);
surface.write (MidiByteArray (2, 0xd0, (id()<<4) | segment));
}
MidiByteArray
Meter::zero ()
{
return MidiByteArray (2, 0xD0, (id()<<4 | 0));
}
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