using namespace ARDOUR;
using namespace PBD;
+// used for low-pass filter denormal protection
+#define GAIN_COEFF_TINY (1e-10) // -200dB
+
Amp::Amp (Session& s, std::string type)
: Processor(s, "Amp")
, _apply_gain(true)
, _apply_gain_automation(false)
- , _current_gain(GAIN_COEFF_UNITY)
+ , _current_gain(GAIN_COEFF_ZERO)
, _current_automation_frame (INT64_MAX)
, _gain_automation_buffer(0)
- , _type(type)
+ , _type (type)
+ , _midi_amp (type != "trim")
{
Evoral::Parameter p (_type == "trim" ? TrimAutomation : GainAutomation);
boost::shared_ptr<AutomationList> gl (new AutomationList (p));
std::string
Amp::display_name() const
{
- return _("Fader");
+ return _type == "trim" ? _("Trim") : _("Fader");
}
bool
gain_t* gab = _gain_automation_buffer;
assert (gab);
- const float a = 62.78 / _session.nominal_frame_rate(); // 10 Hz LPF
- float lpf = _current_gain;
+ 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();
}
}
- if (lpf < 1e-10) {
- _current_gain = 0;
+ if (fabs (lpf) < GAIN_COEFF_TINY) {
+ _current_gain = GAIN_COEFF_ZERO;
} else {
_current_gain = lpf;
}
if (_current_gain != dg) {
- _current_gain = Amp::apply_gain (bufs, _session.nominal_frame_rate(), nframes, _current_gain, dg);
+ _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
- */
+ /* gain has not changed, but its non-unity */
- for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
+ 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 (_current_gain);
+ 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));
+ }
}
}
}
}
gain_t
-Amp::apply_gain (BufferSet& bufs, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target)
+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;
}
/* MIDI Gain */
- 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;
- }
+ 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);
+ 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;
+ }
- for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
- Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
+ 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 (initial+scale);
+ if (ev.is_note_on()) {
+ const gain_t scale = delta * (ev.time()/(double) nframes);
+ ev.scale_velocity (fabsf (initial+scale));
+ }
}
}
}
/* 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 float a = 62.78 / sample_rate; // 10 Hz LPF
+ 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();
- float lpf = initial;
+ double lpf = initial;
for (pframes_t nx = 0; nx < nframes; ++nx) {
buffer[nx] *= lpf;
rv = lpf;
}
}
- // 1e-10 ~ 200dB, prevent denormals.
- if (rv < 1e-10) return 0;
- if (fabsf(rv - 1.0) < 1e-10) return 1.0;
+ if (fabsf (rv - target) < GAIN_COEFF_TINY) return target;
+ if (fabsf (rv) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
return rv;
}
}
Sample* const buffer = buf.data();
- const float a = 62.78 / sample_rate; // 10 Hz LPF, see [other] Amp::apply_gain() above,
+ const double a = 156.825 / sample_rate; // 25 Hz LPF, see [other] Amp::apply_gain() above for details
- float lpf = initial;
+ double lpf = initial;
for (pframes_t nx = 0; nx < nframes; ++nx) {
buffer[nx] *= lpf;
lpf += a * (target - lpf);
}
- if (lpf < 1e-10) return 0; // TODO use GAIN_COEFF_TINY or _DENORMAL
- if (fabsf(lpf - GAIN_COEFF_UNITY) < 1e-10) return GAIN_COEFF_UNITY;
+ 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)
+Amp::apply_simple_gain (BufferSet& bufs, framecnt_t nframes, gain_t target, bool midi_amp)
{
- if (target < GAIN_COEFF_SMALL) {
+ if (fabsf (target) < GAIN_COEFF_SMALL) {
- for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
- MidiBuffer& mb (*i);
+ 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 (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
+ Evoral::MIDIEvent<MidiBuffer::TimeType> ev = *m;
+ if (ev.is_note_on()) {
+ ev.set_velocity (0);
+ }
}
}
}
} else if (target != GAIN_COEFF_UNITY) {
- for (BufferSet::midi_iterator i = bufs.midi_begin(); i != bufs.midi_end(); ++i) {
- MidiBuffer& mb (*i);
+ 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 (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));
+ }
}
}
}
void
Amp::apply_simple_gain (AudioBuffer& buf, framecnt_t nframes, gain_t target)
{
- if (target < GAIN_COEFF_SMALL) {
+ 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);
{
float desired_gain = _gain_control->user_double();
- if (desired_gain < GAIN_COEFF_SMALL) {
+ if (fabsf (desired_gain) < GAIN_COEFF_SMALL) {
+ // really?! what's the idea here?
set_gain (0.000001f + (0.000001f * factor), src);
} else {
set_gain (desired_gain + (desired_gain * factor), src);