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 namespace ARDOUR {
  31
  32
  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
  36  * be set to 0.
  37  */
  38 void
  39 PeakMeter::run_in_place (BufferSet& bufs, nframes_t start_frame, nframes_t end_frame, nframes_t nframes)
  40 {
  41         uint32_t n = 0;
  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());
  44
  45         // Meter what we have (midi)
  46         for ( ; n < limit; ++n) {
  47                 float val = 0;
  48
  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);
  56                                 if (this_vel > val)
  57                                         val = this_vel;
  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
  69         limit = std::min (meterable, bufs.count().n_audio());
  70
  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]);
  74         }
  75
  76         // Zero any excess peaks
  77         for (size_t n = meterable; n < _peak_power.size(); ++n) {
  78                 _peak_power[n] = 0;
  79         }
  80 }
  81
  82 void
  83 PeakMeter::reset ()
  84 {
  85         for (size_t i = 0; i < _peak_power.size(); ++i) {
  86                 _peak_power[i] = 0;
  87         }
  88 }
  89
  90 void
  91 PeakMeter::reset_max ()
  92 {
  93         for (size_t i = 0; i < _max_peak_power.size(); ++i) {
  94                 _max_peak_power[i] = -INFINITY;
  95         }
  96 }
  97
  98 bool
  99 PeakMeter::configure_io (ChanCount in, ChanCount out)
 100 {
 101         /* we're transparent no matter what.  fight the power. */
 102         if (out != in) {
 103                 return false;
 104         }
 105
 106         uint32_t limit = in.n_total();
 107
 108         while (_peak_power.size() > limit) {
 109                 _peak_power.pop_back();
 110                 _visible_peak_power.pop_back();
 111                 _max_peak_power.pop_back();
 112         }
 113
 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());
 118         }
 119
 120         assert(_peak_power.size() == limit);
 121         assert(_visible_peak_power.size() == limit);
 122         assert(_max_peak_power.size() == limit);
 123
 124         return Processor::configure_io (in, out);
 125 }
 126
 127 /** To be driven by the Meter signal from IO.
 128  * Caller MUST hold io_lock!
 129  */
 130 void
 131 PeakMeter::meter ()
 132 {
 133         assert(_visible_peak_power.size() == _peak_power.size());
 134
 135         const size_t limit = _peak_power.size();
 136
 137         for (size_t n = 0; n < limit; ++n) {
 138
 139                 /* XXX we should use atomic exchange here */
 140
 141                 /* grab peak since last read */
 142
 143                 float new_peak = _peak_power[n];
 144                 _peak_power[n] = 0;
 145
 146                 /* compute new visible value using falloff */
 147
 148                 if (new_peak > 0.0) {
 149                         new_peak = coefficient_to_dB (new_peak);
 150                 } else {
 151                         new_peak = minus_infinity();
 152                 }
 153
 154                 /* update max peak */
 155
 156                 _max_peak_power[n] = std::max (new_peak, _max_peak_power[n]);
 157
 158                 if (Config->get_meter_falloff() == 0.0f || new_peak > _visible_peak_power[n]) {
 159                         _visible_peak_power[n] = new_peak;
 160                 } else {
 161                         // do falloff
 162                         new_peak = _visible_peak_power[n] - (Config->get_meter_falloff() * 0.01f);
 163                         _visible_peak_power[n] = std::max (new_peak, -INFINITY);
 164                 }
 165         }
 166 }
 167
 168 } // namespace ARDOUR