libs/ardour/meter.cc

   1 /*
   2     Copyright (C) 2006 Paul Davis
   3
   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)
   7     any later version.
   8
   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
  12     for more details.
  13
  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.
  17 */
  18
  19 #include "ardour/meter.h"
  20 #include <algorithm>
  21 #include <cmath>
  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"
  29
  30 using namespace std;
  31
  32 namespace ARDOUR {
  33
  34
  35 /** Get peaks from @a bufs
  36  * Input acceptance is lenient - the first n buffers from @a bufs will
  37  * be metered, where n was set by the last call to setup(), excess meters will
  38  * be set to 0.
  39  */
  40 void
  41 PeakMeter::run_in_place (BufferSet& bufs, nframes_t start_frame, nframes_t end_frame, nframes_t nframes)
  42 {
  43         const uint32_t n_audio = min(_configured_input.n_audio(), bufs.count().n_audio());
  44         const uint32_t n_midi  = min(_configured_input.n_midi(), bufs.count().n_midi());
  45
  46         uint32_t n = 0;
  47
  48         // Meter MIDI in to the first n_midi peaks
  49         for (uint32_t i = 0; i < n_midi; ++i, ++n) {
  50                 float val = 0.0f;
  51                 for (MidiBuffer::iterator e = bufs.get_midi(i).begin(); e != bufs.get_midi(i).end(); ++e) {
  52                         const Evoral::MIDIEvent<nframes_t> ev(*e, 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                                 if (this_vel > val) {
  56                                         val = this_vel;
  57                                 }
  58                         } else {
  59                                 val += 1.0 / bufs.get_midi(n).capacity();
  60                                 if (val > 1.0) {
  61                                         val = 1.0;
  62                                 }
  63                         }
  64                 }
  65                 _peak_power[n] = val;
  66         }
  67
  68         // Meter audio in to the rest of the peaks
  69         for (uint32_t i = 0; i < n_audio; ++i, ++n) {
  70                 _peak_power[n] = compute_peak (bufs.get_audio(i).data(), nframes, _peak_power[n]);
  71         }
  72
  73         // Zero any excess peaks
  74         for (uint32_t i = n; i < _peak_power.size(); ++i) {
  75                 _peak_power[i] = 0.0f;
  76         }
  77 }
  78
  79 void
  80 PeakMeter::reset ()
  81 {
  82         for (size_t i = 0; i < _peak_power.size(); ++i) {
  83                 _peak_power[i] = 0.0f;
  84         }
  85 }
  86
  87 void
  88 PeakMeter::reset_max ()
  89 {
  90         for (size_t i = 0; i < _max_peak_power.size(); ++i) {
  91                 _max_peak_power[i] = -INFINITY;
  92         }
  93 }
  94
  95 bool
  96 PeakMeter::can_support_io_configuration (const ChanCount& in, ChanCount& out) const
  97 {
  98         out = in;
  99         return true;
 100 }
 101
 102 bool
 103 PeakMeter::configure_io (ChanCount in, ChanCount out)
 104 {
 105         if (out != in) { // always 1:1
 106                 return false;
 107         }
 108
 109         uint32_t limit = in.n_total();
 110
 111         while (_peak_power.size() > limit) {
 112                 _peak_power.pop_back();
 113                 _visible_peak_power.pop_back();
 114                 _max_peak_power.pop_back();
 115         }
 116
 117         while (_peak_power.size() < limit) {
 118                 _peak_power.push_back(0);
 119                 _visible_peak_power.push_back(minus_infinity());
 120                 _max_peak_power.push_back(minus_infinity());
 121         }
 122
 123         assert(_peak_power.size() == limit);
 124         assert(_visible_peak_power.size() == limit);
 125         assert(_max_peak_power.size() == limit);
 126
 127         return Processor::configure_io (in, out);
 128 }
 129
 130 /** To be driven by the Meter signal from IO.
 131  * Caller MUST hold io_lock!
 132  */
 133 void
 134 PeakMeter::meter ()
 135 {
 136         assert(_visible_peak_power.size() == _peak_power.size());
 137
 138         const size_t limit = _peak_power.size();
 139
 140         for (size_t n = 0; n < limit; ++n) {
 141
 142                 /* XXX we should use atomic exchange here */
 143
 144                 /* grab peak since last read */
 145
 146                 float new_peak = _peak_power[n];
 147                 _peak_power[n] = 0;
 148
 149                 /* compute new visible value using falloff */
 150
 151                 if (new_peak > 0.0) {
 152                         new_peak = coefficient_to_dB (new_peak);
 153                 } else {
 154                         new_peak = minus_infinity();
 155                 }
 156
 157                 /* update max peak */
 158
 159                 _max_peak_power[n] = std::max (new_peak, _max_peak_power[n]);
 160
 161                 if (Config->get_meter_falloff() == 0.0f || new_peak > _visible_peak_power[n]) {
 162                         _visible_peak_power[n] = new_peak;
 163                 } else {
 164                         // do falloff
 165                         new_peak = _visible_peak_power[n] - (Config->get_meter_falloff() * 0.01f);
 166                         _visible_peak_power[n] = std::max (new_peak, -INFINITY);
 167                 }
 168         }
 169 }
 170
 171 XMLNode&
 172 PeakMeter::state (bool full_state)
 173 {
 174         return get_state();
 175 }
 176
 177 XMLNode&
 178 PeakMeter::get_state()
 179 {
 180         XMLNode* node = new XMLNode(state_node_name);
 181         node->add_property("type", "meter");
 182         return *node;
 183 }
 184
 185 } // namespace ARDOUR