136 lines
3.3 KiB
C++
136 lines
3.3 KiB
C++
/*
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* Copyright (C) 2006-2007 John Anderson
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* Copyright (C) 2012-2016 Paul Davis <paul@linuxaudiosystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <cmath>
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#include "pbd/compose.h"
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#include "ardour/debug.h"
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#include "meter.h"
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#include "surface.h"
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#include "surface_port.h"
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#include "control_group.h"
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#include "mackie_control_protocol.h"
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using namespace PBD;
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using namespace ArdourSurface;
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using namespace Mackie;
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Control*
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Meter::factory (Surface& surface, int id, const char* name, Group& group)
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{
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Meter* m = new Meter (id, name, group);
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surface.meters[id] = m;
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surface.controls.push_back (m);
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group.add (*m);
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return m;
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}
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void
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Meter::notify_metering_state_changed(Surface& surface, bool transport_is_rolling, bool metering_active)
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{
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MidiByteArray msg;
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// sysex header
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msg << surface.sysex_hdr();
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// code for Channel Meter Enable Message
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msg << 0x20;
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// Channel identification
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msg << id();
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// Enable (0x07) / Disable (0x00) level meter on LCD, peak hold display on horizontal meter and signal LED
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_enabled = ((surface.mcp().device_info().has_separate_meters() || transport_is_rolling) && metering_active);
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msg << (_enabled ? 0x07 : 0x00);
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// sysex trailer
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msg << MIDI::eox;
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surface.write (msg);
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}
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void
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Meter::send_update (Surface& surface, float dB)
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{
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std::pair<bool,float> result = calculate_meter_over_and_deflection(dB);
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MidiByteArray msg;
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if (result.first) {
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if (!overload_on) {
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overload_on = true;
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surface.write (MidiByteArray (2, 0xd0, (id() << 4) | 0xe));
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}
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} else {
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if (overload_on) {
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overload_on = false;
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surface.write (MidiByteArray (2, 0xd0, (id() << 4) | 0xf));
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}
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}
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/* we can use up to 13 segments */
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int segment = lrintf ((result.second/115.0) * 13.0);
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surface.write (MidiByteArray (2, 0xd0, (id()<<4) | segment));
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}
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MidiByteArray
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Meter::zero ()
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{
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return MidiByteArray (2, 0xD0, (id()<<4 | 0));
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}
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std::pair<bool, float>
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Meter::calculate_meter_over_and_deflection (float dB)
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{
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float def = 0.0f; /* Meter deflection %age */
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bool over = false;
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if (dB < -70.0f) {
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def = 0.0f;
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} else if (dB < -60.0f) {
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def = (dB + 70.0f) * 0.25f;
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} else if (dB < -50.0f) {
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def = (dB + 60.0f) * 0.5f + 2.5f;
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} else if (dB < -40.0f) {
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def = (dB + 50.0f) * 0.75f + 7.5f;
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} else if (dB < -30.0f) {
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def = (dB + 40.0f) * 1.5f + 15.0f;
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} else if (dB < -20.0f) {
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def = (dB + 30.0f) * 2.0f + 30.0f;
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} else if (dB < 6.0f) {
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def = (dB + 20.0f) * 2.5f + 50.0f;
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} else {
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def = 115.0f;
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}
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/* 115 is the deflection %age that would be
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when dB=6.0. this is an arbitrary
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endpoint for our scaling.
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*/
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if (def > 100.0f) {
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over = true;
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}
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return std::make_pair (over, def);
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}
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