/*
- Copyright (C) 2006 Paul Davis
-
+ Copyright (C) 2006 Paul Davis
+
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
-
+
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
-
+
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#include <iostream>
#include <cstring>
#include <cmath>
#include <algorithm>
-#include <ardour/amp.h>
-#include <ardour/buffer_set.h>
-#include <ardour/audio_buffer.h>
-namespace ARDOUR {
+#include "evoral/Curve.hpp"
+
+#include "ardour/amp.h"
+#include "ardour/audio_buffer.h"
+#include "ardour/buffer_set.h"
+#include "ardour/gain_control.h"
+#include "ardour/midi_buffer.h"
+#include "ardour/rc_configuration.h"
+#include "ardour/session.h"
+
+#include "pbd/i18n.h"
+using namespace ARDOUR;
+using namespace PBD;
+
+// used for low-pass filter denormal protection
+#define GAIN_COEFF_TINY (1e-10) // -200dB
+
+Amp::Amp (Session& s, const std::string& name, boost::shared_ptr<GainControl> gc, bool control_midi_also)
+ : Processor(s, "Amp")
+ , _apply_gain(true)
+ , _apply_gain_automation(false)
+ , _current_gain(GAIN_COEFF_ZERO)
+ , _current_automation_frame (INT64_MAX)
+ , _gain_control (gc)
+ , _gain_automation_buffer(0)
+ , _midi_amp (control_midi_also)
+{
+ set_display_name (name);
+ add_control (_gain_control);
+}
+
+bool
+Amp::can_support_io_configuration (const ChanCount& in, ChanCount& out)
+{
+ out = in;
+ return true;
+}
+
+bool
+Amp::configure_io (ChanCount in, ChanCount out)
+{
+ if (out != in) { // always 1:1
+ return false;
+ }
+
+ return Processor::configure_io (in, out);
+}
-/** Apply a declicked gain to the audio buffers of @a bufs */
void
-Amp::run_in_place (BufferSet& bufs, nframes_t nframes, gain_t initial, gain_t target, bool invert_polarity)
+Amp::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_frame*/, double /*speed*/, pframes_t nframes, bool)
{
- if (nframes == 0)
+ if (!_active && !_pending_active) {
return;
+ }
- if (bufs.count().n_audio() == 0)
- return;
+ if (_apply_gain) {
+
+ if (_apply_gain_automation) {
+
+ gain_t* gab = _gain_automation_buffer;
+ assert (gab);
+
+ if (_midi_amp) {
+ for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
+ MidiBuffer& mb (*i);
+ for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
+ Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
+ if (ev.is_note_on()) {
+ assert(ev.time() >= 0 && ev.time() < nframes);
+ ev.scale_velocity (fabsf (gab[ev.time()]));
+ }
+ }
+ }
+ }
+
+
+ const double a = 156.825 / _session.nominal_frame_rate(); // 25 Hz LPF; see Amp::apply_gain for details
+ double lpf = _current_gain;
+
+ for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
+ Sample* const sp = i->data();
+ lpf = _current_gain;
+ for (pframes_t nx = 0; nx < nframes; ++nx) {
+ sp[nx] *= lpf;
+ lpf += a * (gab[nx] - lpf);
+ }
+ }
+
+ if (fabs (lpf) < GAIN_COEFF_TINY) {
+ _current_gain = GAIN_COEFF_ZERO;
+ } else {
+ _current_gain = lpf;
+ }
+
+ } else { /* manual (scalar) gain */
+
+ gain_t const dg = _gain_control->get_value();
+
+ if (_current_gain != dg) {
- // assert(bufs.buffer_capacity(DataType::AUDIO) >= nframes);
+ _current_gain = Amp::apply_gain (bufs, _session.nominal_frame_rate(), nframes, _current_gain, dg, _midi_amp);
+
+ } else if (_current_gain != GAIN_COEFF_UNITY) {
+
+ /* gain has not changed, but its non-unity */
+
+ if (_midi_amp) {
+ /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
+ for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
+
+ MidiBuffer& mb (*i);
+
+ for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
+ Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
+ if (ev.is_note_on()) {
+ ev.scale_velocity (fabsf (_current_gain));
+ }
+ }
+ }
+ }
+
+ for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
+ apply_gain_to_buffer (i->data(), nframes, _current_gain);
+ }
+ }
+ }
+ }
+
+ _active = _pending_active;
+}
+
+gain_t
+Amp::apply_gain (BufferSet& bufs, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target, bool midi_amp)
+{
+ /** Apply a (potentially) declicked gain to the buffers of @a bufs */
+ gain_t rv = target;
+
+ if (nframes == 0 || bufs.count().n_total() == 0) {
+ return initial;
+ }
// if we don't need to declick, defer to apply_simple_gain
if (initial == target) {
- if (target == 0.0) {
- for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
- memset (i->data(), 0, sizeof (Sample) * nframes);
+ apply_simple_gain (bufs, nframes, target);
+ return target;
+ }
+
+ /* MIDI Gain */
+ if (midi_amp) {
+ /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
+ for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
+
+ gain_t delta;
+ if (target < initial) {
+ /* fade out: remove more and more of delta from initial */
+ delta = -(initial - target);
+ } else {
+ /* fade in: add more and more of delta from initial */
+ delta = target - initial;
}
- } else if (target != 1.0) {
- for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
- apply_gain_to_buffer (i->data(), nframes, target);
+
+ MidiBuffer& mb (*i);
+
+ for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
+ Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
+
+ if (ev.is_note_on()) {
+ const gain_t scale = delta * (ev.time()/(double) nframes);
+ ev.scale_velocity (fabsf (initial+scale));
+ }
}
}
+ }
+
+ /* Audio Gain */
+
+ /* Low pass filter coefficient: 1.0 - e^(-2.0 * π * f / 48000) f in Hz.
+ * for f << SR, approx a ~= 6.2 * f / SR;
+ */
+ const double a = 156.825 / sample_rate; // 25 Hz LPF
+
+ for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
+ Sample* const buffer = i->data();
+ double lpf = initial;
+
+ for (pframes_t nx = 0; nx < nframes; ++nx) {
+ buffer[nx] *= lpf;
+ lpf += a * (target - lpf);
+ }
+ if (i == bufs.audio_begin()) {
+ rv = lpf;
+ }
+ }
+ if (fabsf (rv - target) < GAIN_COEFF_TINY) return target;
+ if (fabsf (rv) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
+ return rv;
+}
+
+void
+Amp::declick (BufferSet& bufs, framecnt_t nframes, int dir)
+{
+ if (nframes == 0 || bufs.count().n_total() == 0) {
return;
}
- const nframes_t declick = std::min ((nframes_t)128, nframes);
- gain_t delta;
- double fractional_shift = -1.0/declick;
- double fractional_pos;
- gain_t polscale = invert_polarity ? -1.0f : 1.0f;
+ const framecnt_t declick = std::min ((framecnt_t) 512, nframes);
+ const double fractional_shift = 1.0 / declick ;
+ gain_t delta, initial;
- if (target < initial) {
+ if (dir < 0) {
/* fade out: remove more and more of delta from initial */
- delta = -(initial - target);
+ delta = -1.0;
+ initial = GAIN_COEFF_UNITY;
} else {
/* fade in: add more and more of delta from initial */
- delta = target - initial;
+ delta = 1.0;
+ initial = GAIN_COEFF_ZERO;
}
+ /* Audio Gain */
for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
Sample* const buffer = i->data();
- fractional_pos = 1.0;
+ double fractional_pos = 0.0;
- for (nframes_t nx = 0; nx < declick; ++nx) {
- buffer[nx] *= polscale * (initial + (delta * (0.5 + 0.5 * cos (M_PI * fractional_pos))));
+ for (pframes_t nx = 0; nx < declick; ++nx) {
+ buffer[nx] *= initial + (delta * fractional_pos);
fractional_pos += fractional_shift;
}
-
+
/* now ensure the rest of the buffer has the target value applied, if necessary. */
-
if (declick != nframes) {
+ if (dir < 0) {
+ memset (&buffer[declick], 0, sizeof (Sample) * (nframes - declick));
+ }
+ }
+ }
+}
+
+
+gain_t
+Amp::apply_gain (AudioBuffer& buf, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target)
+{
+ /* Apply a (potentially) declicked gain to the contents of @a buf
+ * -- used by MonitorProcessor::run()
+ */
+
+ if (nframes == 0) {
+ return initial;
+ }
+
+ // if we don't need to declick, defer to apply_simple_gain
+ if (initial == target) {
+ apply_simple_gain (buf, nframes, target);
+ return target;
+ }
+
+ Sample* const buffer = buf.data();
+ const double a = 156.825 / sample_rate; // 25 Hz LPF, see [other] Amp::apply_gain() above for details
+
+ double lpf = initial;
+ for (pframes_t nx = 0; nx < nframes; ++nx) {
+ buffer[nx] *= lpf;
+ lpf += a * (target - lpf);
+ }
+
+ if (fabs (lpf - target) < GAIN_COEFF_TINY) return target;
+ if (fabs (lpf) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
+ return lpf;
+}
+
+void
+Amp::apply_simple_gain (BufferSet& bufs, framecnt_t nframes, gain_t target, bool midi_amp)
+{
+ if (fabsf (target) < GAIN_COEFF_SMALL) {
- if (invert_polarity) {
- target = -target;
+ if (midi_amp) {
+ /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
+ for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
+ MidiBuffer& mb (*i);
+
+ for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
+ Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
+ if (ev.is_note_on()) {
+ ev.set_velocity (0);
+ }
+ }
}
+ }
+
+ for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
+ memset (i->data(), 0, sizeof (Sample) * nframes);
+ }
+
+ } else if (target != GAIN_COEFF_UNITY) {
+
+ if (midi_amp) {
+ /* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
+ for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
+ MidiBuffer& mb (*i);
- if (target == 0.0) {
- memset (&buffer[declick], 0, sizeof (Sample) * (nframes - declick));
- } else if (target != 1.0) {
- apply_gain_to_buffer (&buffer[declick], nframes - declick, target);
+ for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
+ Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
+ if (ev.is_note_on()) {
+ ev.scale_velocity (fabsf (target));
+ }
+ }
}
}
+
+ for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
+ apply_gain_to_buffer (i->data(), nframes, target);
+ }
+ }
+}
+
+void
+Amp::apply_simple_gain (AudioBuffer& buf, framecnt_t nframes, gain_t target)
+{
+ if (fabsf (target) < GAIN_COEFF_SMALL) {
+ memset (buf.data(), 0, sizeof (Sample) * nframes);
+ } else if (target != GAIN_COEFF_UNITY) {
+ apply_gain_to_buffer (buf.data(), nframes, target);
}
}
+XMLNode&
+Amp::state (bool full_state)
+{
+ XMLNode& node (Processor::state (full_state));
+ node.add_property("type", _gain_control->parameter().type() == GainAutomation ? "amp" : "trim");
+ node.add_child_nocopy (_gain_control->get_state());
+
+ return node;
+}
+
+int
+Amp::set_state (const XMLNode& node, int version)
+{
+ XMLNode* gain_node;
+
+ Processor::set_state (node, version);
+
+ if ((gain_node = node.child (Controllable::xml_node_name.c_str())) != 0) {
+ _gain_control->set_state (*gain_node, version);
+ }
+
+ return 0;
+}
+
+/** Write gain automation for this cycle into the buffer previously passed in to
+ * set_gain_automation_buffer (if we are in automation playback mode and the
+ * transport is rolling).
+ */
void
-Amp::apply_simple_gain (BufferSet& bufs, nframes_t nframes, gain_t target)
+Amp::setup_gain_automation (framepos_t start_frame, framepos_t end_frame, framecnt_t nframes)
+{
+ Glib::Threads::Mutex::Lock am (control_lock(), Glib::Threads::TRY_LOCK);
+
+ if (am.locked()
+ && (_session.transport_rolling() || _session.bounce_processing())
+ && _gain_control->automation_playback())
+ {
+ assert (_gain_automation_buffer);
+ _apply_gain_automation = _gain_control->list()->curve().rt_safe_get_vector (
+ start_frame, end_frame, _gain_automation_buffer, nframes);
+ if (start_frame != _current_automation_frame && _session.bounce_processing ()) {
+ _current_gain = _gain_automation_buffer[0];
+ }
+ _current_automation_frame = end_frame;
+ } else {
+ _apply_gain_automation = false;
+ _current_automation_frame = INT64_MAX;
+ }
+}
+
+bool
+Amp::visible() const
{
+ return true;
}
+std::string
+Amp::value_as_string (boost::shared_ptr<const AutomationControl> ac) const
+{
+ if (ac == _gain_control) {
+ char buffer[32];
+ snprintf (buffer, sizeof (buffer), _("%.2fdB"), ac->internal_to_user (ac->get_value ()));
+ return buffer;
+ }
+
+ return Automatable::value_as_string (ac);
+}
-} // namespace ARDOUR
+/** Sets up the buffer that setup_gain_automation and ::run will use for
+ * gain automationc curves. Must be called before setup_gain_automation,
+ * and must be called with process lock held.
+ */
+
+void
+Amp::set_gain_automation_buffer (gain_t* g)
+{
+ _gain_automation_buffer = g;
+}
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