libs/ardour/amp.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 <iostream>
  20 #include <cstring>
  21 #include <cmath>
  22 #include <algorithm>
  23
  24 #include "evoral/Curve.hpp"
  25
  26 #include "ardour/amp.h"
  27 #include "ardour/audio_buffer.h"
  28 #include "ardour/buffer_set.h"
  29 #include "ardour/configuration.h"
  30 #include "ardour/io.h"
  31 #include "ardour/midi_buffer.h"
  32 #include "ardour/session.h"
  33
  34 #include "i18n.h"
  35
  36 using namespace ARDOUR;
  37
  38 Amp::Amp (Session& s)
  39         : Processor(s, "Amp")
  40         , _apply_gain(true)
  41         , _apply_gain_automation(false)
  42         , _current_gain(1.0)
  43 {
  44         boost::shared_ptr<AutomationList> gl(new AutomationList(Evoral::Parameter(GainAutomation)));
  45         _gain_control = boost::shared_ptr<GainControl>( new GainControl(X_("gaincontrol"), s, this, Evoral::Parameter(GainAutomation), gl ));
  46         add_control(_gain_control);
  47 }
  48
  49 std::string
  50 Amp::display_name() const
  51 {
  52         return _("Fader");
  53 }
  54
  55 bool
  56 Amp::can_support_io_configuration (const ChanCount& in, ChanCount& out) const
  57 {
  58         out = in;
  59         return true;
  60 }
  61
  62 bool
  63 Amp::configure_io (ChanCount in, ChanCount out)
  64 {
  65         if (out != in) { // always 1:1
  66                 return false;
  67         }
  68
  69         return Processor::configure_io (in, out);
  70 }
  71
  72 void
  73 Amp::run (BufferSet& bufs, sframes_t /*start_frame*/, sframes_t /*end_frame*/, nframes_t nframes, bool)
  74 {
  75         if (!_active && !_pending_active) {
  76                 return;
  77         }
  78
  79         if (_apply_gain) {
  80
  81                 if (_apply_gain_automation) {
  82
  83                         gain_t* gab = _session.gain_automation_buffer ();
  84
  85                         for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
  86                                 Sample* const sp = i->data();
  87                                 for (nframes_t nx = 0; nx < nframes; ++nx) {
  88                                         sp[nx] *= gab[nx];
  89                                 }
  90                         }
  91
  92                         _current_gain = gab[nframes-1];
  93
  94                 } else { /* manual (scalar) gain */
  95
  96                         gain_t const dg = _gain_control->user_float();
  97
  98                         if (_current_gain != dg) {
  99
 100                                 Amp::apply_gain (bufs, nframes, _current_gain, dg);
 101                                 _current_gain = dg;
 102
 103                         } else if (_current_gain != 1.0f) {
 104
 105                                 /* gain has not changed, but its non-unity
 106                                 */
 107
 108                                 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
 109
 110                                         MidiBuffer& mb (*i);
 111
 112                                         for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
 113                                                 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
 114                                                 if (ev.is_note_on()) {
 115                                                         ev.scale_velocity (_current_gain);
 116                                                 }
 117                                         }
 118                                 }
 119
 120                                 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
 121                                         apply_gain_to_buffer (i->data(), nframes, _current_gain);
 122                                 }
 123                         }
 124                 }
 125         }
 126
 127         _active = _pending_active;
 128 }
 129
 130 void
 131 Amp::apply_gain (BufferSet& bufs, nframes_t nframes, gain_t initial, gain_t target)
 132 {
 133         /** Apply a (potentially) declicked gain to the buffers of @a bufs
 134          */
 135
 136         if (nframes == 0 || bufs.count().n_total() == 0) {
 137                 return;
 138         }
 139
 140         // if we don't need to declick, defer to apply_simple_gain
 141         if (initial == target) {
 142                 apply_simple_gain (bufs, nframes, target);
 143                 return;
 144         }
 145
 146         const nframes_t declick = std::min ((nframes_t)128, nframes);
 147         gain_t         delta;
 148         double         fractional_shift = -1.0/declick;
 149         double         fractional_pos;
 150
 151         if (target < initial) {
 152                 /* fade out: remove more and more of delta from initial */
 153                 delta = -(initial - target);
 154         } else {
 155                 /* fade in: add more and more of delta from initial */
 156                 delta = target - initial;
 157         }
 158
 159         /* MIDI Gain */
 160
 161         for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
 162
 163
 164                 MidiBuffer& mb (*i);
 165
 166                 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
 167                         Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
 168
 169                         if (ev.is_note_on()) {
 170                                 gain_t scale = delta * (ev.time()/(double) nframes);
 171                                 ev.scale_velocity (initial+scale);
 172                         }
 173                 }
 174         }
 175
 176         /* Audio Gain */
 177
 178         for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
 179                 Sample* const buffer = i->data();
 180
 181                 fractional_pos = 1.0;
 182
 183                 for (nframes_t nx = 0; nx < declick; ++nx) {
 184                         buffer[nx] *= (initial + (delta * (0.5 + 0.5 * cos (M_PI * fractional_pos))));
 185                         fractional_pos += fractional_shift;
 186                 }
 187
 188                 /* now ensure the rest of the buffer has the target value applied, if necessary. */
 189
 190                 if (declick != nframes) {
 191
 192                         if (target == 0.0) {
 193                                 memset (&buffer[declick], 0, sizeof (Sample) * (nframes - declick));
 194                         } else if (target != 1.0) {
 195                                 apply_gain_to_buffer (&buffer[declick], nframes - declick, target);
 196                         }
 197                 }
 198         }
 199 }
 200
 201 void
 202 Amp::apply_gain (AudioBuffer& buf, nframes_t nframes, gain_t initial, gain_t target)
 203 {
 204         /** Apply a (potentially) declicked gain to the contents of @a buf
 205          */
 206
 207         if (nframes == 0) {
 208                 return;
 209         }
 210
 211         // if we don't need to declick, defer to apply_simple_gain
 212         if (initial == target) {
 213                 apply_simple_gain (buf, nframes, target);
 214                 return;
 215         }
 216
 217         const nframes_t declick = std::min ((nframes_t)128, nframes);
 218         gain_t         delta;
 219         double         fractional_shift = -1.0/declick;
 220         double         fractional_pos;
 221
 222         if (target < initial) {
 223                 /* fade out: remove more and more of delta from initial */
 224                 delta = -(initial - target);
 225         } else {
 226                 /* fade in: add more and more of delta from initial */
 227                 delta = target - initial;
 228         }
 229
 230
 231         Sample* const buffer = buf.data();
 232
 233         fractional_pos = 1.0;
 234
 235         for (nframes_t nx = 0; nx < declick; ++nx) {
 236                 buffer[nx] *= (initial + (delta * (0.5 + 0.5 * cos (M_PI * fractional_pos))));
 237                 fractional_pos += fractional_shift;
 238         }
 239
 240         /* now ensure the rest of the buffer has the target value applied, if necessary. */
 241
 242         if (declick != nframes) {
 243
 244                 if (target == 0.0) {
 245                         memset (&buffer[declick], 0, sizeof (Sample) * (nframes - declick));
 246                 } else if (target != 1.0) {
 247                         apply_gain_to_buffer (&buffer[declick], nframes - declick, target);
 248                 }
 249         }
 250 }
 251
 252 void
 253 Amp::apply_simple_gain (BufferSet& bufs, nframes_t nframes, gain_t target)
 254 {
 255         if (target == 0.0) {
 256
 257                 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
 258                         MidiBuffer& mb (*i);
 259
 260                         for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
 261                                 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
 262                                 if (ev.is_note_on()) {
 263                                         ev.set_velocity (0);
 264                                 }
 265                         }
 266                 }
 267
 268                 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
 269                         memset (i->data(), 0, sizeof (Sample) * nframes);
 270                 }
 271
 272         } else if (target != 1.0) {
 273
 274                 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
 275                         MidiBuffer& mb (*i);
 276
 277                         for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
 278                                 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
 279                                 if (ev.is_note_on()) {
 280                                         ev.scale_velocity (target);
 281                                 }
 282                         }
 283                 }
 284
 285                 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
 286                         apply_gain_to_buffer (i->data(), nframes, target);
 287                 }
 288         }
 289 }
 290
 291 void
 292 Amp::apply_simple_gain (AudioBuffer& buf, nframes_t nframes, gain_t target)
 293 {
 294         if (target == 0.0) {
 295                 memset (buf.data(), 0, sizeof (Sample) * nframes);
 296         } else if (target != 1.0) {
 297                 apply_gain_to_buffer (buf.data(), nframes, target);
 298         }
 299 }
 300
 301 void
 302 Amp::inc_gain (gain_t factor, void *src)
 303 {
 304         float desired_gain = _gain_control->user_float();
 305
 306         if (desired_gain == 0.0f) {
 307                 set_gain (0.000001f + (0.000001f * factor), src);
 308         } else {
 309                 set_gain (desired_gain + (desired_gain * factor), src);
 310         }
 311 }
 312
 313 void
 314 Amp::set_gain (gain_t val, void *src)
 315 {
 316         // max gain at about +6dB (10.0 ^ ( 6 dB * 0.05))
 317         if (val > 1.99526231f) {
 318                 val = 1.99526231f;
 319         }
 320
 321         //cerr << "set desired gain to " << val << " when curgain = " << _gain_control->get_value () << endl;
 322
 323         if (src != _gain_control.get()) {
 324                 _gain_control->set_value (val);
 325                 // bit twisty, this will come back and call us again
 326                 // (this keeps control in sync with reality)
 327                 return;
 328         }
 329
 330         _gain_control->set_float(val, false);
 331         _session.set_dirty();
 332 }
 333
 334 XMLNode&
 335 Amp::state (bool full_state)
 336 {
 337         XMLNode& node (Processor::state (full_state));
 338         node.add_property("type", "amp");
 339
 340         char buf[32];
 341         snprintf (buf, sizeof (buf), "%2.12f", _gain_control->get_value());
 342         node.add_property("gain", buf);
 343
 344         return node;
 345 }
 346
 347 int
 348 Amp::set_state (const XMLNode& node, int version)
 349 {
 350         const XMLProperty* prop;
 351
 352         Processor::set_state (node, version);
 353         prop = node.property ("gain");
 354
 355         if (prop) {
 356                 gain_t val;
 357
 358                 if (sscanf (prop->value().c_str(), "%f", &val) == 1) {
 359                         _gain_control->set_value (val);
 360                 }
 361         }
 362
 363         return 0;
 364 }
 365
 366 void
 367 Amp::GainControl::set_value (float val)
 368 {
 369         // max gain at about +6dB (10.0 ^ ( 6 dB * 0.05))
 370         if (val > 1.99526231f)
 371                 val = 1.99526231f;
 372
 373         _amp->set_gain (val, this);
 374
 375         AutomationControl::set_value(val);
 376 }
 377
 378 float
 379 Amp::GainControl::get_value (void) const
 380 {
 381         return AutomationControl::get_value();
 382 }
 383
 384 void
 385 Amp::setup_gain_automation (sframes_t start_frame, sframes_t end_frame, nframes_t nframes)
 386 {
 387         Glib::Mutex::Lock am (control_lock(), Glib::TRY_LOCK);
 388
 389         if (am.locked() && _session.transport_rolling() && _gain_control->automation_playback()) {
 390                 _apply_gain_automation = _gain_control->list()->curve().rt_safe_get_vector (
 391                         start_frame, end_frame, _session.gain_automation_buffer(), nframes);
 392         } else {
 393                 _apply_gain_automation = false;
 394         }
 395 }
 396
 397 bool
 398 Amp::visible() const
 399 {
 400         return true;
 401 }