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 boost::signals2::signal<void()> Metering::Meter;
35 Glib::StaticMutex Metering::m_meter_signal_lock;
37 boost::signals2::connection
38 Metering::connect (boost::function<void()> f)
40 // SignalProcessor::Meter is emitted from another thread so the
41 // Meter signal must be protected.
42 Glib::Mutex::Lock guard (m_meter_signal_lock);
43 return Meter.connect (f);
47 Metering::disconnect (boost::signals2::connection& c)
49 Glib::Mutex::Lock guard (m_meter_signal_lock);
56 The meter signal lock is taken to prevent modification of the
57 Meter signal while updating the meters, taking the meter signal
58 lock prior to taking the io_lock ensures that all IO will remain
62 Metering::update_meters()
64 Glib::Mutex::Lock guard (m_meter_signal_lock);
65 Meter(); /* EMIT SIGNAL */
68 PeakMeter::PeakMeter (Session& s, const XMLNode& node)
74 /** Get peaks from @a bufs
75 * Input acceptance is lenient - the first n buffers from @a bufs will
76 * be metered, where n was set by the last call to setup(), excess meters will
80 PeakMeter::run (BufferSet& bufs, sframes_t /*start_frame*/, sframes_t /*end_frame*/, nframes_t nframes, bool)
82 if (!_active && !_pending_active) {
86 const uint32_t n_audio = min(_configured_input.n_audio(), bufs.count().n_audio());
87 const uint32_t n_midi = min(_configured_input.n_midi(), bufs.count().n_midi());
91 // Meter MIDI in to the first n_midi peaks
92 for (uint32_t i = 0; i < n_midi; ++i, ++n) {
94 for (MidiBuffer::iterator e = bufs.get_midi(i).begin(); e != bufs.get_midi(i).end(); ++e) {
95 const Evoral::MIDIEvent<nframes_t> ev(*e, false);
96 if (ev.is_note_on()) {
97 const float this_vel = log(ev.buffer()[2] / 127.0 * (M_E*M_E-M_E) + M_E) - 1.0;
102 val += 1.0 / bufs.get_midi(n).capacity();
108 _peak_power[n] = val;
111 // Meter audio in to the rest of the peaks
112 for (uint32_t i = 0; i < n_audio; ++i, ++n) {
113 _peak_power[n] = compute_peak (bufs.get_audio(i).data(), nframes, _peak_power[n]);
116 // Zero any excess peaks
117 for (uint32_t i = n; i < _peak_power.size(); ++i) {
118 _peak_power[i] = 0.0f;
121 _active = _pending_active;
127 for (size_t i = 0; i < _peak_power.size(); ++i) {
128 _peak_power[i] = 0.0f;
133 PeakMeter::reset_max ()
135 for (size_t i = 0; i < _max_peak_power.size(); ++i) {
136 _max_peak_power[i] = -INFINITY;
141 PeakMeter::can_support_io_configuration (const ChanCount& in, ChanCount& out) const
148 PeakMeter::configure_io (ChanCount in, ChanCount out)
150 if (out != in) { // always 1:1
154 current_meters = in.n_total ();
156 return Processor::configure_io (in, out);
160 PeakMeter::reflect_inputs (const ChanCount& in)
162 current_meters = in.n_total ();
166 PeakMeter::reset_max_channels (const ChanCount& chn)
168 uint32_t limit = chn.n_total();
170 while (_peak_power.size() > limit) {
171 _peak_power.pop_back();
172 _visible_peak_power.pop_back();
173 _max_peak_power.pop_back();
176 while (_peak_power.size() < limit) {
177 _peak_power.push_back(0);
178 _visible_peak_power.push_back(minus_infinity());
179 _max_peak_power.push_back(minus_infinity());
182 assert(_peak_power.size() == limit);
183 assert(_visible_peak_power.size() == limit);
184 assert(_max_peak_power.size() == limit);
187 /** To be driven by the Meter signal from IO.
188 * Caller MUST hold its own processor_lock to prevent reconfiguration
189 * of meter size during this call.
199 assert(_visible_peak_power.size() == _peak_power.size());
201 const size_t limit = min (_peak_power.size(), (size_t) current_meters);
203 for (size_t n = 0; n < limit; ++n) {
205 /* grab peak since last read */
207 float new_peak = _peak_power[n]; /* XXX we should use atomic exchange from here ... */
208 _peak_power[n] = 0; /* ... to here */
210 /* compute new visible value using falloff */
212 if (new_peak > 0.0) {
213 new_peak = fast_coefficient_to_dB (new_peak);
215 new_peak = minus_infinity();
218 /* update max peak */
220 _max_peak_power[n] = std::max (new_peak, _max_peak_power[n]);
222 if (Config->get_meter_falloff() == 0.0f || new_peak > _visible_peak_power[n]) {
223 _visible_peak_power[n] = new_peak;
226 new_peak = _visible_peak_power[n] - (Config->get_meter_falloff() * 0.01f);
227 _visible_peak_power[n] = std::max (new_peak, -INFINITY);
233 PeakMeter::state (bool full_state)
235 XMLNode& node (Processor::state (full_state));
236 node.add_property("type", "meter");