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.
23 #include "evoral/Curve.hpp"
25 #include "ardour/amp.h"
26 #include "ardour/audio_buffer.h"
27 #include "ardour/buffer_set.h"
28 #include "ardour/gain_control.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, const std::string& name, boost::shared_ptr<GainControl> gc, bool control_midi_also)
44 , _apply_gain_automation(false)
45 , _current_gain(GAIN_COEFF_ZERO)
46 , _current_automation_frame (INT64_MAX)
48 , _gain_automation_buffer(0)
49 , _midi_amp (control_midi_also)
51 set_display_name (name);
52 add_control (_gain_control);
56 Amp::can_support_io_configuration (const ChanCount& in, ChanCount& out)
63 Amp::configure_io (ChanCount in, ChanCount out)
65 if (out != in) { // always 1:1
69 return Processor::configure_io (in, out);
73 scale_midi_velocity(Evoral::Event<MidiBuffer::TimeType>& ev, float factor)
75 factor = std::max(factor, 0.0f);
76 ev.set_velocity(std::min(127L, lrintf(ev.velocity() * factor)));
80 Amp::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_frame*/, double /*speed*/, pframes_t nframes, bool)
82 if (!_active && !_pending_active) {
88 if (_apply_gain_automation) {
90 gain_t* gab = _gain_automation_buffer;
93 /* see note in PluginInsert::connect_and_run -- emit Changed signal */
94 _gain_control->set_value_unchecked (gab[0]);
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::Event<MidiBuffer::TimeType> ev = *m;
101 if (ev.is_note_on()) {
102 assert(ev.time() >= 0 && ev.time() < nframes);
103 scale_midi_velocity (ev, 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->get_value();
132 if (_current_gain != dg) {
134 _current_gain = Amp::apply_gain (bufs, _session.nominal_frame_rate(), nframes, _current_gain, dg, _midi_amp);
136 /* see note in PluginInsert::connect_and_run ()
137 * set_value_unchecked() won't emit a signal since the value is effectively unchanged
140 _gain_control->Changed (false, PBD::Controllable::NoGroup);
142 } else if (_current_gain != GAIN_COEFF_UNITY) {
144 /* gain has not changed, but its non-unity */
147 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
148 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
152 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
153 Evoral::Event<MidiBuffer::TimeType> ev = *m;
154 if (ev.is_note_on()) {
155 scale_midi_velocity (ev, fabsf (_current_gain));
161 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
162 apply_gain_to_buffer (i->data(), nframes, _current_gain);
168 _active = _pending_active;
172 Amp::apply_gain (BufferSet& bufs, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target, bool midi_amp)
174 /** Apply a (potentially) declicked gain to the buffers of @a bufs */
177 if (nframes == 0 || bufs.count().n_total() == 0) {
181 // if we don't need to declick, defer to apply_simple_gain
182 if (initial == target) {
183 apply_simple_gain (bufs, nframes, target);
189 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
190 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
193 if (target < initial) {
194 /* fade out: remove more and more of delta from initial */
195 delta = -(initial - target);
197 /* fade in: add more and more of delta from initial */
198 delta = target - initial;
203 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
204 Evoral::Event<MidiBuffer::TimeType> ev = *m;
206 if (ev.is_note_on()) {
207 const gain_t scale = delta * (ev.time()/(double) nframes);
208 scale_midi_velocity (ev, fabsf (initial + scale));
216 /* Low pass filter coefficient: 1.0 - e^(-2.0 * π * f / 48000) f in Hz.
217 * for f << SR, approx a ~= 6.2 * f / SR;
219 const double a = 156.825 / sample_rate; // 25 Hz LPF
221 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
222 Sample* const buffer = i->data();
223 double lpf = initial;
225 for (pframes_t nx = 0; nx < nframes; ++nx) {
227 lpf += a * (target - lpf);
229 if (i == bufs.audio_begin()) {
233 if (fabsf (rv - target) < GAIN_COEFF_TINY) return target;
234 if (fabsf (rv) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
239 Amp::declick (BufferSet& bufs, framecnt_t nframes, int dir)
241 if (nframes == 0 || bufs.count().n_total() == 0) {
245 const framecnt_t declick = std::min ((framecnt_t) 512, nframes);
246 const double fractional_shift = 1.0 / declick ;
247 gain_t delta, initial;
250 /* fade out: remove more and more of delta from initial */
252 initial = GAIN_COEFF_UNITY;
254 /* fade in: add more and more of delta from initial */
256 initial = GAIN_COEFF_ZERO;
260 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
261 Sample* const buffer = i->data();
263 double fractional_pos = 0.0;
265 for (pframes_t nx = 0; nx < declick; ++nx) {
266 buffer[nx] *= initial + (delta * fractional_pos);
267 fractional_pos += fractional_shift;
270 /* now ensure the rest of the buffer has the target value applied, if necessary. */
271 if (declick != nframes) {
273 memset (&buffer[declick], 0, sizeof (Sample) * (nframes - declick));
281 Amp::apply_gain (AudioBuffer& buf, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target)
283 /* Apply a (potentially) declicked gain to the contents of @a buf
284 * -- used by MonitorProcessor::run()
291 // if we don't need to declick, defer to apply_simple_gain
292 if (initial == target) {
293 apply_simple_gain (buf, nframes, target);
297 Sample* const buffer = buf.data();
298 const double a = 156.825 / sample_rate; // 25 Hz LPF, see [other] Amp::apply_gain() above for details
300 double lpf = initial;
301 for (pframes_t nx = 0; nx < nframes; ++nx) {
303 lpf += a * (target - lpf);
306 if (fabs (lpf - target) < GAIN_COEFF_TINY) return target;
307 if (fabs (lpf) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
312 Amp::apply_simple_gain (BufferSet& bufs, framecnt_t nframes, gain_t target, bool midi_amp)
314 if (fabsf (target) < GAIN_COEFF_SMALL) {
317 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
318 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
321 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
322 Evoral::Event<MidiBuffer::TimeType> ev = *m;
323 if (ev.is_note_on()) {
330 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
331 memset (i->data(), 0, sizeof (Sample) * nframes);
334 } else if (target != GAIN_COEFF_UNITY) {
337 /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
338 for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
341 for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
342 Evoral::Event<MidiBuffer::TimeType> ev = *m;
343 if (ev.is_note_on()) {
344 scale_midi_velocity(ev, fabsf (target));
350 for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
351 apply_gain_to_buffer (i->data(), nframes, target);
357 Amp::apply_simple_gain (AudioBuffer& buf, framecnt_t nframes, gain_t target)
359 if (fabsf (target) < GAIN_COEFF_SMALL) {
360 memset (buf.data(), 0, sizeof (Sample) * nframes);
361 } else if (target != GAIN_COEFF_UNITY) {
362 apply_gain_to_buffer (buf.data(), nframes, target);
367 Amp::state (bool full_state)
369 XMLNode& node (Processor::state (full_state));
370 node.set_property("type", _gain_control->parameter().type() == GainAutomation ? "amp" : "trim");
371 node.add_child_nocopy (_gain_control->get_state());
377 Amp::set_state (const XMLNode& node, int version)
381 Processor::set_state (node, version);
383 if ((gain_node = node.child (Controllable::xml_node_name.c_str ())) != 0) {
384 _gain_control->set_state (*gain_node, version);
390 /** Write gain automation for this cycle into the buffer previously passed in to
391 * set_gain_automation_buffer (if we are in automation playback mode and the
392 * transport is rolling).
395 Amp::setup_gain_automation (framepos_t start_frame, framepos_t end_frame, framecnt_t nframes)
397 Glib::Threads::Mutex::Lock am (control_lock(), Glib::Threads::TRY_LOCK);
400 && (_session.transport_rolling() || _session.bounce_processing())
401 && _gain_control->automation_playback())
403 assert (_gain_automation_buffer);
405 _apply_gain_automation = _gain_control->get_masters_curve ( start_frame, end_frame, _gain_automation_buffer, nframes);
407 if (start_frame != _current_automation_frame && _session.bounce_processing ()) {
408 _current_gain = _gain_automation_buffer[0];
410 _current_automation_frame = end_frame;
412 _apply_gain_automation = false;
413 _current_automation_frame = INT64_MAX;
423 /** Sets up the buffer that setup_gain_automation and ::run will use for
424 * gain automationc curves. Must be called before setup_gain_automation,
425 * and must be called with process lock held.
429 Amp::set_gain_automation_buffer (gain_t* g)
431 _gain_automation_buffer = g;