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/gain_control.h"
30 #include "ardour/midi_buffer.h"
31 #include "ardour/rc_configuration.h"
32 #include "ardour/session.h"
36 using namespace ARDOUR;
39 // used for low-pass filter denormal protection
40 #define GAIN_COEFF_TINY (1e-10) // -200dB
42 Amp::Amp (Session& s, const std::string& name, boost::shared_ptr<GainControl> gc, bool control_midi_also)
45 , _apply_gain_automation(false)
46 , _current_gain(GAIN_COEFF_ZERO)
47 , _current_automation_frame (INT64_MAX)
49 , _gain_automation_buffer(0)
50 , _midi_amp (control_midi_also)
52 set_display_name (name);
53 add_control (_gain_control);
57 Amp::can_support_io_configuration (const ChanCount& in, ChanCount& out)
64 Amp::configure_io (ChanCount in, ChanCount out)
66 if (out != in) { // always 1:1
70 return Processor::configure_io (in, out);
74 scale_midi_velocity(Evoral::Event<MidiBuffer::TimeType>& ev, float factor)
76 factor = std::max(factor, 0.0f);
77 ev.set_velocity(std::min(127L, lrintf(ev.velocity() * factor)));
81 Amp::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_frame*/, double /*speed*/, pframes_t nframes, bool)
83 if (!_active && !_pending_active) {
89 if (_apply_gain_automation) {
91 gain_t* gab = _gain_automation_buffer;
95 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
97 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
98 Evoral::Event<MidiBuffer::TimeType> ev = *m;
99 if (ev.is_note_on()) {
100 assert(ev.time() >= 0 && ev.time() < nframes);
101 scale_midi_velocity (ev, fabsf (gab[ev.time()]));
108 const double a = 156.825 / _session.nominal_frame_rate(); // 25 Hz LPF; see Amp::apply_gain for details
109 double lpf = _current_gain;
111 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
112 Sample* const sp = i->data();
114 for (pframes_t nx = 0; nx < nframes; ++nx) {
116 lpf += a * (gab[nx] - lpf);
120 if (fabs (lpf) < GAIN_COEFF_TINY) {
121 _current_gain = GAIN_COEFF_ZERO;
126 } else { /* manual (scalar) gain */
128 gain_t const dg = _gain_control->get_value();
130 if (_current_gain != dg) {
132 _current_gain = Amp::apply_gain (bufs, _session.nominal_frame_rate(), nframes, _current_gain, dg, _midi_amp);
134 } else if (_current_gain != GAIN_COEFF_UNITY) {
136 /* gain has not changed, but its non-unity */
139 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
140 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
144 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
145 Evoral::Event<MidiBuffer::TimeType> ev = *m;
146 if (ev.is_note_on()) {
147 scale_midi_velocity (ev, fabsf (_current_gain));
153 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
154 apply_gain_to_buffer (i->data(), nframes, _current_gain);
160 _active = _pending_active;
164 Amp::apply_gain (BufferSet& bufs, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target, bool midi_amp)
166 /** Apply a (potentially) declicked gain to the buffers of @a bufs */
169 if (nframes == 0 || bufs.count().n_total() == 0) {
173 // if we don't need to declick, defer to apply_simple_gain
174 if (initial == target) {
175 apply_simple_gain (bufs, nframes, target);
181 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
182 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
185 if (target < initial) {
186 /* fade out: remove more and more of delta from initial */
187 delta = -(initial - target);
189 /* fade in: add more and more of delta from initial */
190 delta = target - initial;
195 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
196 Evoral::Event<MidiBuffer::TimeType> ev = *m;
198 if (ev.is_note_on()) {
199 const gain_t scale = delta * (ev.time()/(double) nframes);
200 scale_midi_velocity (ev, fabsf (initial + scale));
208 /* Low pass filter coefficient: 1.0 - e^(-2.0 * π * f / 48000) f in Hz.
209 * for f << SR, approx a ~= 6.2 * f / SR;
211 const double a = 156.825 / sample_rate; // 25 Hz LPF
213 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
214 Sample* const buffer = i->data();
215 double lpf = initial;
217 for (pframes_t nx = 0; nx < nframes; ++nx) {
219 lpf += a * (target - lpf);
221 if (i == bufs.audio_begin()) {
225 if (fabsf (rv - target) < GAIN_COEFF_TINY) return target;
226 if (fabsf (rv) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
231 Amp::declick (BufferSet& bufs, framecnt_t nframes, int dir)
233 if (nframes == 0 || bufs.count().n_total() == 0) {
237 const framecnt_t declick = std::min ((framecnt_t) 512, nframes);
238 const double fractional_shift = 1.0 / declick ;
239 gain_t delta, initial;
242 /* fade out: remove more and more of delta from initial */
244 initial = GAIN_COEFF_UNITY;
246 /* fade in: add more and more of delta from initial */
248 initial = GAIN_COEFF_ZERO;
252 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
253 Sample* const buffer = i->data();
255 double fractional_pos = 0.0;
257 for (pframes_t nx = 0; nx < declick; ++nx) {
258 buffer[nx] *= initial + (delta * fractional_pos);
259 fractional_pos += fractional_shift;
262 /* now ensure the rest of the buffer has the target value applied, if necessary. */
263 if (declick != nframes) {
265 memset (&buffer[declick], 0, sizeof (Sample) * (nframes - declick));
273 Amp::apply_gain (AudioBuffer& buf, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target)
275 /* Apply a (potentially) declicked gain to the contents of @a buf
276 * -- used by MonitorProcessor::run()
283 // if we don't need to declick, defer to apply_simple_gain
284 if (initial == target) {
285 apply_simple_gain (buf, nframes, target);
289 Sample* const buffer = buf.data();
290 const double a = 156.825 / sample_rate; // 25 Hz LPF, see [other] Amp::apply_gain() above for details
292 double lpf = initial;
293 for (pframes_t nx = 0; nx < nframes; ++nx) {
295 lpf += a * (target - lpf);
298 if (fabs (lpf - target) < GAIN_COEFF_TINY) return target;
299 if (fabs (lpf) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
304 Amp::apply_simple_gain (BufferSet& bufs, framecnt_t nframes, gain_t target, bool midi_amp)
306 if (fabsf (target) < GAIN_COEFF_SMALL) {
309 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
310 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
313 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
314 Evoral::Event<MidiBuffer::TimeType> ev = *m;
315 if (ev.is_note_on()) {
322 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
323 memset (i->data(), 0, sizeof (Sample) * nframes);
326 } else if (target != GAIN_COEFF_UNITY) {
329 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
330 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
333 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
334 Evoral::Event<MidiBuffer::TimeType> ev = *m;
335 if (ev.is_note_on()) {
336 scale_midi_velocity(ev, fabsf (target));
342 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
343 apply_gain_to_buffer (i->data(), nframes, target);
349 Amp::apply_simple_gain (AudioBuffer& buf, framecnt_t nframes, gain_t target)
351 if (fabsf (target) < GAIN_COEFF_SMALL) {
352 memset (buf.data(), 0, sizeof (Sample) * nframes);
353 } else if (target != GAIN_COEFF_UNITY) {
354 apply_gain_to_buffer (buf.data(), nframes, target);
359 Amp::state (bool full_state)
361 XMLNode& node (Processor::state (full_state));
362 node.add_property("type", _gain_control->parameter().type() == GainAutomation ? "amp" : "trim");
363 node.add_child_nocopy (_gain_control->get_state());
369 Amp::set_state (const XMLNode& node, int version)
373 Processor::set_state (node, version);
375 if ((gain_node = node.child (Controllable::xml_node_name.c_str())) != 0) {
376 _gain_control->set_state (*gain_node, version);
382 /** Write gain automation for this cycle into the buffer previously passed in to
383 * set_gain_automation_buffer (if we are in automation playback mode and the
384 * transport is rolling).
387 Amp::setup_gain_automation (framepos_t start_frame, framepos_t end_frame, framecnt_t nframes)
389 Glib::Threads::Mutex::Lock am (control_lock(), Glib::Threads::TRY_LOCK);
392 && (_session.transport_rolling() || _session.bounce_processing())
393 && _gain_control->automation_playback())
395 assert (_gain_automation_buffer);
396 _apply_gain_automation = _gain_control->list()->curve().rt_safe_get_vector (
397 start_frame, end_frame, _gain_automation_buffer, nframes);
399 /* XXX the future requires a way to automate the control master
400 * and merge its own automation vector/curve with this one. We
401 * don't have a way to do that just yet, so for now, just get
402 * the master's current gain and scale our own automation
403 * vector/curve by this value.
406 if (_gain_control->slaved()) {
407 const double master_gain = _gain_control->get_masters_value ();
408 if (master_gain != 1.0) {
409 apply_gain_to_buffer (_gain_automation_buffer, nframes, master_gain);
413 if (start_frame != _current_automation_frame && _session.bounce_processing ()) {
414 _current_gain = _gain_automation_buffer[0];
416 _current_automation_frame = end_frame;
418 _apply_gain_automation = false;
419 _current_automation_frame = INT64_MAX;
430 Amp::value_as_string (boost::shared_ptr<const AutomationControl> ac) const
432 if (ac == _gain_control) {
434 snprintf (buffer, sizeof (buffer), _("%.2fdB"), ac->internal_to_user (ac->get_value ()));
438 return Automatable::value_as_string (ac);
441 /** Sets up the buffer that setup_gain_automation and ::run will use for
442 * gain automationc curves. Must be called before setup_gain_automation,
443 * and must be called with process lock held.
447 Amp::set_gain_automation_buffer (gain_t* g)
449 _gain_automation_buffer = g;