2 Copyright (C) 2006 Paul Davis
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU General Public License as published by the Free
6 Software Foundation; either version 2 of the License, or (at your option)
9 This program is distributed in the hope that it will be useful, but WITHOUT
10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 You should have received a copy of the GNU General Public License along
15 with this program; if not, write to the Free Software Foundation, Inc.,
16 675 Mass Ave, Cambridge, MA 02139, USA.
19 #include "ardour/meter.h"
22 #include "ardour/buffer_set.h"
23 #include "ardour/peak.h"
24 #include "ardour/dB.h"
25 #include "ardour/session.h"
26 #include "ardour/midi_buffer.h"
27 #include "ardour/audio_buffer.h"
28 #include "ardour/runtime_functions.h"
32 using namespace ARDOUR;
34 PBD::Signal0<void> Metering::Meter;
36 /** Get peaks from @a bufs
37 * Input acceptance is lenient - the first n buffers from @a bufs will
38 * be metered, where n was set by the last call to setup(), excess meters will
42 PeakMeter::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_frame*/, pframes_t nframes, bool)
44 if (!_active && !_pending_active) {
48 // cerr << "meter " << name() << " runs with " << bufs.available() << " inputs\n";
50 const uint32_t n_audio = min (current_meters.n_audio(), bufs.count().n_audio());
51 const uint32_t n_midi = min (current_meters.n_midi(), bufs.count().n_midi());
55 // Meter MIDI in to the first n_midi peaks
56 for (uint32_t i = 0; i < n_midi; ++i, ++n) {
58 for (MidiBuffer::iterator e = bufs.get_midi(i).begin(); e != bufs.get_midi(i).end(); ++e) {
59 const Evoral::MIDIEvent<framepos_t> ev(*e, false);
60 if (ev.is_note_on()) {
61 const float this_vel = log(ev.buffer()[2] / 127.0 * (M_E*M_E-M_E) + M_E) - 1.0;
66 val += 1.0 / bufs.get_midi(n).capacity();
72 _peak_power[n] = max (val, _peak_power[n]);
75 // Meter audio in to the rest of the peaks
76 for (uint32_t i = 0; i < n_audio; ++i, ++n) {
77 _peak_power[n] = compute_peak (bufs.get_audio(i).data(), nframes, _peak_power[n]);
80 // Zero any excess peaks
81 for (uint32_t i = n; i < _peak_power.size(); ++i) {
82 _peak_power[i] = 0.0f;
85 _active = _pending_active;
91 for (size_t i = 0; i < _peak_power.size(); ++i) {
92 _peak_power[i] = 0.0f;
97 PeakMeter::reset_max ()
99 for (size_t i = 0; i < _max_peak_power.size(); ++i) {
100 _max_peak_power[i] = -INFINITY;
105 PeakMeter::can_support_io_configuration (const ChanCount& in, ChanCount& out) const
112 PeakMeter::configure_io (ChanCount in, ChanCount out)
114 if (out != in) { // always 1:1
120 reset_max_channels (in);
122 return Processor::configure_io (in, out);
126 PeakMeter::reflect_inputs (const ChanCount& in)
132 PeakMeter::reset_max_channels (const ChanCount& chn)
134 uint32_t const limit = chn.n_total();
136 while (_peak_power.size() > limit) {
137 _peak_power.pop_back();
138 _visible_peak_power.pop_back();
139 _max_peak_power.pop_back();
142 while (_peak_power.size() < limit) {
143 _peak_power.push_back(0);
144 _visible_peak_power.push_back(minus_infinity());
145 _max_peak_power.push_back(minus_infinity());
148 assert(_peak_power.size() == limit);
149 assert(_visible_peak_power.size() == limit);
150 assert(_max_peak_power.size() == limit);
153 /** To be driven by the Meter signal from IO.
154 * Caller MUST hold its own processor_lock to prevent reconfiguration
155 * of meter size during this call.
165 assert(_visible_peak_power.size() == _peak_power.size());
167 const size_t limit = min (_peak_power.size(), (size_t) current_meters.n_total ());
169 for (size_t n = 0; n < limit; ++n) {
171 /* grab peak since last read */
173 float new_peak = _peak_power[n]; /* XXX we should use atomic exchange from here ... */
174 _peak_power[n] = 0; /* ... to here */
176 /* compute new visible value using falloff */
178 if (new_peak > 0.0) {
179 new_peak = fast_coefficient_to_dB (new_peak);
181 new_peak = minus_infinity();
184 /* update max peak */
186 _max_peak_power[n] = std::max (new_peak, _max_peak_power[n]);
188 if (Config->get_meter_falloff() == 0.0f || new_peak > _visible_peak_power[n]) {
189 _visible_peak_power[n] = new_peak;
192 new_peak = _visible_peak_power[n] - (Config->get_meter_falloff() * 0.01f);
193 _visible_peak_power[n] = std::max (new_peak, -INFINITY);
199 PeakMeter::state (bool full_state)
201 XMLNode& node (Processor::state (full_state));
202 node.add_property("type", "meter");