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"
33 /** Get peaks from @a bufs
34 * Input acceptance is lenient - the first n buffers from @a bufs will
35 * be metered, where n was set by the last call to setup(), excess meters will
39 PeakMeter::run_in_place (BufferSet& bufs, nframes_t start_frame, nframes_t end_frame, nframes_t nframes)
42 uint32_t meterable = std::min(bufs.count().n_total(), (uint32_t)_peak_power.size());
43 uint32_t limit = std::min (meterable, (uint32_t)bufs.count().n_midi());
45 // Meter what we have (midi)
46 for ( ; n < limit; ++n) {
49 // GUI needs a better MIDI meter, not much information can be
50 // expressed through peaks alone
51 for (MidiBuffer::iterator i = bufs.get_midi(n).begin(); i != bufs.get_midi(n).end(); ++i) {
52 const Evoral::MIDIEvent<nframes_t> ev(*i, false);
53 if (ev.is_note_on()) {
54 const float this_vel = log(ev.buffer()[2] / 127.0 * (M_E*M_E-M_E) + M_E) - 1.0;
55 //printf("V %d -> %f\n", (int)((Byte)ev.buffer[2]), this_vel);
59 val += 1.0 / bufs.get_midi(n).capacity();
69 limit = std::min (meterable, bufs.count().n_audio());
71 // Meter what we have (audio)
72 for ( ; n < limit; ++n) {
73 _peak_power[n] = compute_peak (bufs.get_audio(n).data(), nframes, _peak_power[n]);
76 // Zero any excess peaks
77 for (size_t n = meterable; n < _peak_power.size(); ++n) {
85 for (size_t i = 0; i < _peak_power.size(); ++i) {
91 PeakMeter::reset_max ()
93 for (size_t i = 0; i < _max_peak_power.size(); ++i) {
94 _max_peak_power[i] = -INFINITY;
99 PeakMeter::configure_io (ChanCount in, ChanCount out)
101 /* we're transparent no matter what. fight the power. */
106 uint32_t limit = in.n_total();
108 while (_peak_power.size() > limit) {
109 _peak_power.pop_back();
110 _visible_peak_power.pop_back();
111 _max_peak_power.pop_back();
114 while (_peak_power.size() < limit) {
115 _peak_power.push_back(0);
116 _visible_peak_power.push_back(minus_infinity());
117 _max_peak_power.push_back(minus_infinity());
120 assert(_peak_power.size() == limit);
121 assert(_visible_peak_power.size() == limit);
122 assert(_max_peak_power.size() == limit);
124 return Processor::configure_io (in, out);
127 /** To be driven by the Meter signal from IO.
128 * Caller MUST hold io_lock!
133 assert(_visible_peak_power.size() == _peak_power.size());
135 const size_t limit = _peak_power.size();
137 for (size_t n = 0; n < limit; ++n) {
139 /* XXX we should use atomic exchange here */
141 /* grab peak since last read */
143 float new_peak = _peak_power[n];
146 /* compute new visible value using falloff */
148 if (new_peak > 0.0) {
149 new_peak = coefficient_to_dB (new_peak);
151 new_peak = minus_infinity();
154 /* update max peak */
156 _max_peak_power[n] = std::max (new_peak, _max_peak_power[n]);
158 if (Config->get_meter_falloff() == 0.0f || new_peak > _visible_peak_power[n]) {
159 _visible_peak_power[n] = new_peak;
162 new_peak = _visible_peak_power[n] - (Config->get_meter_falloff() * 0.01f);
163 _visible_peak_power[n] = std::max (new_peak, -INFINITY);
168 } // namespace ARDOUR