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.
24 #include "evoral/Curve.hpp"
26 #include "ardour/amp.h"
27 #include "ardour/audio_buffer.h"
28 #include "ardour/buffer_set.h"
29 #include "ardour/midi_buffer.h"
30 #include "ardour/rc_configuration.h"
31 #include "ardour/session.h"
35 using namespace ARDOUR;
38 // used for low-pass filter denormal protection
39 #define GAIN_COEFF_TINY (1e-10) // -200dB
41 Amp::Amp (Session& s, std::string type)
44 , _apply_gain_automation(false)
45 , _current_gain(GAIN_COEFF_ZERO)
46 , _current_automation_frame (INT64_MAX)
47 , _gain_automation_buffer(0)
49 , _midi_amp (type != "trim")
51 Evoral::Parameter p (_type == "trim" ? TrimAutomation : GainAutomation);
52 boost::shared_ptr<AutomationList> gl (new AutomationList (p));
53 _gain_control = boost::shared_ptr<GainControl> (new GainControl ((_type == "trim") ? X_("trimcontrol") : X_("gaincontrol"), s, this, p, gl));
54 _gain_control->set_flags (Controllable::GainLike);
56 add_control(_gain_control);
60 Amp::display_name() const
66 Amp::can_support_io_configuration (const ChanCount& in, ChanCount& out)
73 Amp::configure_io (ChanCount in, ChanCount out)
75 if (out != in) { // always 1:1
79 return Processor::configure_io (in, out);
83 Amp::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_frame*/, pframes_t nframes, bool)
85 if (!_active && !_pending_active) {
91 if (_apply_gain_automation) {
93 gain_t* gab = _gain_automation_buffer;
97 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
99 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
100 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
101 if (ev.is_note_on()) {
102 assert(ev.time() >= 0 && ev.time() < nframes);
103 ev.scale_velocity (fabsf (gab[ev.time()]));
110 const double a = 156.825 / _session.nominal_frame_rate(); // 25 Hz LPF; see Amp::apply_gain for details
111 double lpf = _current_gain;
113 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
114 Sample* const sp = i->data();
116 for (pframes_t nx = 0; nx < nframes; ++nx) {
118 lpf += a * (gab[nx] - lpf);
122 if (fabs (lpf) < GAIN_COEFF_TINY) {
123 _current_gain = GAIN_COEFF_ZERO;
128 } else { /* manual (scalar) gain */
130 gain_t const dg = _gain_control->user_double();
132 if (_current_gain != dg) {
134 _current_gain = Amp::apply_gain (bufs, _session.nominal_frame_rate(), nframes, _current_gain, dg, _midi_amp);
136 } else if (_current_gain == GAIN_COEFF_ZERO) {
138 /* gain has not changed, and is zero. small
142 bufs.silence (nframes, 0);
144 } else if (_current_gain != GAIN_COEFF_UNITY) {
146 /* gain has not changed, but its non-unity and
147 * isn't zero, so we have to do something
151 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
152 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
156 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
157 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
158 if (ev.is_note_on()) {
159 ev.scale_velocity (fabsf (_current_gain));
165 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
166 apply_gain_to_buffer (i->data(), nframes, _current_gain);
172 _active = _pending_active;
176 Amp::apply_gain (BufferSet& bufs, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target, bool midi_amp)
178 /** Apply a (potentially) declicked gain to the buffers of @a bufs */
181 if (nframes == 0 || bufs.count().n_total() == 0) {
185 // if we don't need to declick, defer to apply_simple_gain
186 if (initial == target) {
187 apply_simple_gain (bufs, nframes, target);
193 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
194 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
197 if (target < initial) {
198 /* fade out: remove more and more of delta from initial */
199 delta = -(initial - target);
201 /* fade in: add more and more of delta from initial */
202 delta = target - initial;
207 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
208 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
210 if (ev.is_note_on()) {
211 const gain_t scale = delta * (ev.time()/(double) nframes);
212 ev.scale_velocity (fabsf (initial+scale));
220 /* Low pass filter coefficient: 1.0 - e^(-2.0 * π * f / 48000) f in Hz.
221 * for f << SR, approx a ~= 6.2 * f / SR;
223 const double a = 156.825 / sample_rate; // 25 Hz LPF
225 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
226 Sample* const buffer = i->data();
227 double lpf = initial;
229 for (pframes_t nx = 0; nx < nframes; ++nx) {
231 lpf += a * (target - lpf);
233 if (i == bufs.audio_begin()) {
237 if (fabsf (rv - target) < GAIN_COEFF_TINY) return target;
238 if (fabsf (rv) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
243 Amp::declick (BufferSet& bufs, framecnt_t nframes, int dir)
245 if (nframes == 0 || bufs.count().n_total() == 0) {
249 const framecnt_t declick = std::min ((framecnt_t) 512, nframes);
250 const double fractional_shift = 1.0 / declick ;
251 gain_t delta, initial;
254 /* fade out: remove more and more of delta from initial */
256 initial = GAIN_COEFF_UNITY;
258 /* fade in: add more and more of delta from initial */
260 initial = GAIN_COEFF_ZERO;
264 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
265 Sample* const buffer = i->data();
267 double fractional_pos = 0.0;
269 for (pframes_t nx = 0; nx < declick; ++nx) {
270 buffer[nx] *= initial + (delta * fractional_pos);
271 fractional_pos += fractional_shift;
274 /* now ensure the rest of the buffer has the target value applied, if necessary. */
275 if (declick != nframes) {
277 memset (&buffer[declick], 0, sizeof (Sample) * (nframes - declick));
285 Amp::apply_gain (AudioBuffer& buf, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target)
287 /* Apply a (potentially) declicked gain to the contents of @a buf
288 * -- used by MonitorProcessor::run()
295 // if we don't need to declick, defer to apply_simple_gain
296 if (initial == target) {
297 apply_simple_gain (buf, nframes, target);
301 Sample* const buffer = buf.data();
302 const double a = 156.825 / sample_rate; // 25 Hz LPF, see [other] Amp::apply_gain() above for details
304 double lpf = initial;
305 for (pframes_t nx = 0; nx < nframes; ++nx) {
307 lpf += a * (target - lpf);
310 if (fabs (lpf - target) < GAIN_COEFF_TINY) return target;
311 if (fabs (lpf) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
316 Amp::apply_simple_gain (BufferSet& bufs, framecnt_t nframes, gain_t target, bool midi_amp)
318 if (fabsf (target) < GAIN_COEFF_SMALL) {
321 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
322 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
325 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
326 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
327 if (ev.is_note_on()) {
334 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
335 memset (i->data(), 0, sizeof (Sample) * nframes);
338 } else if (target != GAIN_COEFF_UNITY) {
341 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
342 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
345 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
346 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
347 if (ev.is_note_on()) {
348 ev.scale_velocity (fabsf (target));
354 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
355 apply_gain_to_buffer (i->data(), nframes, target);
361 Amp::apply_simple_gain (AudioBuffer& buf, framecnt_t nframes, gain_t target)
363 if (fabsf (target) < GAIN_COEFF_SMALL) {
364 memset (buf.data(), 0, sizeof (Sample) * nframes);
365 } else if (target != GAIN_COEFF_UNITY) {
366 apply_gain_to_buffer (buf.data(), nframes, target);
371 Amp::inc_gain (gain_t factor, void *src)
373 float desired_gain = _gain_control->user_double();
375 if (fabsf (desired_gain) < GAIN_COEFF_SMALL) {
376 // really?! what's the idea here?
377 set_gain (0.000001f + (0.000001f * factor), src);
379 set_gain (desired_gain + (desired_gain * factor), src);
384 Amp::set_gain (gain_t val, void *)
386 _gain_control->set_value (val);
390 Amp::state (bool full_state)
392 XMLNode& node (Processor::state (full_state));
393 node.add_property("type", _type);
394 node.add_child_nocopy (_gain_control->get_state());
400 Amp::set_state (const XMLNode& node, int version)
404 Processor::set_state (node, version);
406 if ((gain_node = node.child (Controllable::xml_node_name.c_str())) != 0) {
407 _gain_control->set_state (*gain_node, version);
414 Amp::GainControl::set_value (double val)
416 AutomationControl::set_value (std::max (std::min (val, (double)_desc.upper), (double)_desc.lower));
417 _amp->session().set_dirty ();
421 Amp::GainControl::internal_to_interface (double v) const
423 if (_desc.type == GainAutomation) {
424 return gain_to_slider_position (v);
426 return (accurate_coefficient_to_dB (v) - lower_db) / range_db;
431 Amp::GainControl::interface_to_internal (double v) const
433 if (_desc.type == GainAutomation) {
434 return slider_position_to_gain (v);
436 return dB_to_coefficient (lower_db + v * range_db);
441 Amp::GainControl::internal_to_user (double v) const
443 return accurate_coefficient_to_dB (v);
447 Amp::GainControl::user_to_internal (double u) const
449 return dB_to_coefficient (u);
453 Amp::GainControl::get_user_string () const
455 char theBuf[32]; sprintf( theBuf, _("%3.1f dB"), accurate_coefficient_to_dB (get_value()));
456 return std::string(theBuf);
459 /** Write gain automation for this cycle into the buffer previously passed in to
460 * set_gain_automation_buffer (if we are in automation playback mode and the
461 * transport is rolling).
464 Amp::setup_gain_automation (framepos_t start_frame, framepos_t end_frame, framecnt_t nframes)
466 Glib::Threads::Mutex::Lock am (control_lock(), Glib::Threads::TRY_LOCK);
469 && (_session.transport_rolling() || _session.bounce_processing())
470 && _gain_control->automation_playback())
472 assert (_gain_automation_buffer);
473 _apply_gain_automation = _gain_control->list()->curve().rt_safe_get_vector (
474 start_frame, end_frame, _gain_automation_buffer, nframes);
475 if (start_frame != _current_automation_frame) {
476 _current_gain = _gain_automation_buffer[0];
478 _current_automation_frame = end_frame;
480 _apply_gain_automation = false;
481 _current_automation_frame = INT64_MAX;
492 Amp::value_as_string (boost::shared_ptr<AutomationControl> ac) const
494 if (ac == _gain_control) {
496 snprintf (buffer, sizeof (buffer), _("%.2fdB"), ac->internal_to_user (ac->get_value ()));
500 return Automatable::value_as_string (ac);
503 /** Sets up the buffer that setup_gain_automation and ::run will use for
504 * gain automationc curves. Must be called before setup_gain_automation,
505 * and must be called with process lock held.
509 Amp::set_gain_automation_buffer (gain_t* g)
511 _gain_automation_buffer = g;