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);
57 set_display_name (_type == "trim" ? _("Trim") : _("Fader"));
61 Amp::can_support_io_configuration (const ChanCount& in, ChanCount& out)
68 Amp::configure_io (ChanCount in, ChanCount out)
70 if (out != in) { // always 1:1
74 return Processor::configure_io (in, out);
78 Amp::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_frame*/, pframes_t nframes, bool)
80 if (!_active && !_pending_active) {
86 if (_apply_gain_automation) {
88 gain_t* gab = _gain_automation_buffer;
92 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
94 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
95 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
96 if (ev.is_note_on()) {
97 assert(ev.time() >= 0 && ev.time() < nframes);
98 ev.scale_velocity (fabsf (gab[ev.time()]));
105 const double a = 156.825 / _session.nominal_frame_rate(); // 25 Hz LPF; see Amp::apply_gain for details
106 double lpf = _current_gain;
108 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
109 Sample* const sp = i->data();
111 for (pframes_t nx = 0; nx < nframes; ++nx) {
113 lpf += a * (gab[nx] - lpf);
117 if (fabs (lpf) < GAIN_COEFF_TINY) {
118 _current_gain = GAIN_COEFF_ZERO;
123 } else { /* manual (scalar) gain */
125 gain_t const dg = _gain_control->user_double();
127 if (_current_gain != dg) {
129 _current_gain = Amp::apply_gain (bufs, _session.nominal_frame_rate(), nframes, _current_gain, dg, _midi_amp);
131 } else if (_current_gain != GAIN_COEFF_UNITY) {
133 /* gain has not changed, but its non-unity */
136 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
137 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
141 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
142 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
143 if (ev.is_note_on()) {
144 ev.scale_velocity (fabsf (_current_gain));
150 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
151 apply_gain_to_buffer (i->data(), nframes, _current_gain);
157 _active = _pending_active;
161 Amp::apply_gain (BufferSet& bufs, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target, bool midi_amp)
163 /** Apply a (potentially) declicked gain to the buffers of @a bufs */
166 if (nframes == 0 || bufs.count().n_total() == 0) {
170 // if we don't need to declick, defer to apply_simple_gain
171 if (initial == target) {
172 apply_simple_gain (bufs, nframes, target);
178 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
179 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
182 if (target < initial) {
183 /* fade out: remove more and more of delta from initial */
184 delta = -(initial - target);
186 /* fade in: add more and more of delta from initial */
187 delta = target - initial;
192 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
193 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
195 if (ev.is_note_on()) {
196 const gain_t scale = delta * (ev.time()/(double) nframes);
197 ev.scale_velocity (fabsf (initial+scale));
205 /* Low pass filter coefficient: 1.0 - e^(-2.0 * π * f / 48000) f in Hz.
206 * for f << SR, approx a ~= 6.2 * f / SR;
208 const double a = 156.825 / sample_rate; // 25 Hz LPF
210 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
211 Sample* const buffer = i->data();
212 double lpf = initial;
214 for (pframes_t nx = 0; nx < nframes; ++nx) {
216 lpf += a * (target - lpf);
218 if (i == bufs.audio_begin()) {
222 if (fabsf (rv - target) < GAIN_COEFF_TINY) return target;
223 if (fabsf (rv) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
228 Amp::declick (BufferSet& bufs, framecnt_t nframes, int dir)
230 if (nframes == 0 || bufs.count().n_total() == 0) {
234 const framecnt_t declick = std::min ((framecnt_t) 512, nframes);
235 const double fractional_shift = 1.0 / declick ;
236 gain_t delta, initial;
239 /* fade out: remove more and more of delta from initial */
241 initial = GAIN_COEFF_UNITY;
243 /* fade in: add more and more of delta from initial */
245 initial = GAIN_COEFF_ZERO;
249 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
250 Sample* const buffer = i->data();
252 double fractional_pos = 0.0;
254 for (pframes_t nx = 0; nx < declick; ++nx) {
255 buffer[nx] *= initial + (delta * fractional_pos);
256 fractional_pos += fractional_shift;
259 /* now ensure the rest of the buffer has the target value applied, if necessary. */
260 if (declick != nframes) {
262 memset (&buffer[declick], 0, sizeof (Sample) * (nframes - declick));
270 Amp::apply_gain (AudioBuffer& buf, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target)
272 /* Apply a (potentially) declicked gain to the contents of @a buf
273 * -- used by MonitorProcessor::run()
280 // if we don't need to declick, defer to apply_simple_gain
281 if (initial == target) {
282 apply_simple_gain (buf, nframes, target);
286 Sample* const buffer = buf.data();
287 const double a = 156.825 / sample_rate; // 25 Hz LPF, see [other] Amp::apply_gain() above for details
289 double lpf = initial;
290 for (pframes_t nx = 0; nx < nframes; ++nx) {
292 lpf += a * (target - lpf);
295 if (fabs (lpf - target) < GAIN_COEFF_TINY) return target;
296 if (fabs (lpf) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
301 Amp::apply_simple_gain (BufferSet& bufs, framecnt_t nframes, gain_t target, bool midi_amp)
303 if (fabsf (target) < GAIN_COEFF_SMALL) {
306 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
307 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
310 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
311 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
312 if (ev.is_note_on()) {
319 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
320 memset (i->data(), 0, sizeof (Sample) * nframes);
323 } else if (target != GAIN_COEFF_UNITY) {
326 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
327 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
330 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
331 Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
332 if (ev.is_note_on()) {
333 ev.scale_velocity (fabsf (target));
339 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
340 apply_gain_to_buffer (i->data(), nframes, target);
346 Amp::apply_simple_gain (AudioBuffer& buf, framecnt_t nframes, gain_t target)
348 if (fabsf (target) < GAIN_COEFF_SMALL) {
349 memset (buf.data(), 0, sizeof (Sample) * nframes);
350 } else if (target != GAIN_COEFF_UNITY) {
351 apply_gain_to_buffer (buf.data(), nframes, target);
356 Amp::inc_gain (gain_t factor, void *src)
358 float desired_gain = _gain_control->user_double();
360 if (fabsf (desired_gain) < GAIN_COEFF_SMALL) {
361 // really?! what's the idea here?
362 set_gain (0.000001f + (0.000001f * factor), src);
364 set_gain (desired_gain + (desired_gain * factor), src);
369 Amp::set_gain (gain_t val, void *)
371 _gain_control->set_value (val);
375 Amp::state (bool full_state)
377 XMLNode& node (Processor::state (full_state));
378 node.add_property("type", _type);
379 node.add_child_nocopy (_gain_control->get_state());
385 Amp::set_state (const XMLNode& node, int version)
389 Processor::set_state (node, version);
391 if ((gain_node = node.child (Controllable::xml_node_name.c_str())) != 0) {
392 _gain_control->set_state (*gain_node, version);
399 Amp::GainControl::set_value (double val)
402 set_value_unchecked (val);
407 Amp::GainControl::set_value_unchecked (double val)
409 AutomationControl::set_value (std::max (std::min (val, (double)_desc.upper), (double)_desc.lower));
410 _amp->session().set_dirty ();
414 Amp::GainControl::internal_to_interface (double v) const
416 if (_desc.type == GainAutomation) {
417 return gain_to_slider_position (v);
419 return (accurate_coefficient_to_dB (v) - lower_db) / range_db;
424 Amp::GainControl::interface_to_internal (double v) const
426 if (_desc.type == GainAutomation) {
427 return slider_position_to_gain (v);
429 return dB_to_coefficient (lower_db + v * range_db);
434 Amp::GainControl::internal_to_user (double v) const
436 return accurate_coefficient_to_dB (v);
440 Amp::GainControl::user_to_internal (double u) const
442 return dB_to_coefficient (u);
446 Amp::GainControl::get_user_string () const
448 char theBuf[32]; sprintf( theBuf, _("%3.1f dB"), accurate_coefficient_to_dB (get_value()));
449 return std::string(theBuf);
452 /** Write gain automation for this cycle into the buffer previously passed in to
453 * set_gain_automation_buffer (if we are in automation playback mode and the
454 * transport is rolling).
457 Amp::setup_gain_automation (framepos_t start_frame, framepos_t end_frame, framecnt_t nframes)
459 Glib::Threads::Mutex::Lock am (control_lock(), Glib::Threads::TRY_LOCK);
462 && (_session.transport_rolling() || _session.bounce_processing())
463 && _gain_control->automation_playback())
465 assert (_gain_automation_buffer);
466 _apply_gain_automation = _gain_control->list()->curve().rt_safe_get_vector (
467 start_frame, end_frame, _gain_automation_buffer, nframes);
468 if (start_frame != _current_automation_frame) {
469 _current_gain = _gain_automation_buffer[0];
471 _current_automation_frame = end_frame;
473 _apply_gain_automation = false;
474 _current_automation_frame = INT64_MAX;
485 Amp::value_as_string (boost::shared_ptr<AutomationControl> ac) const
487 if (ac == _gain_control) {
489 snprintf (buffer, sizeof (buffer), _("%.2fdB"), ac->internal_to_user (ac->get_value ()));
493 return Automatable::value_as_string (ac);
496 /** Sets up the buffer that setup_gain_automation and ::run will use for
497 * gain automationc curves. Must be called before setup_gain_automation,
498 * and must be called with process lock held.
502 Amp::set_gain_automation_buffer (gain_t* g)
504 _gain_automation_buffer = g;