using namespace ARDOUR;
using namespace PBD;
-// used for low-pass filter denormal protection
-#define GAIN_COEFF_TINY (1e-10) // -200dB
+#define GAIN_COEFF_DELTA (1e-5)
Amp::Amp (Session& s, const std::string& name, boost::shared_ptr<GainControl> gc, bool control_midi_also)
: Processor(s, "Amp")
, _apply_gain_automation(false)
, _current_gain(GAIN_COEFF_ZERO)
- , _current_automation_frame (INT64_MAX)
+ , _current_automation_sample (INT64_MAX)
, _gain_control (gc)
, _gain_automation_buffer(0)
, _midi_amp (control_midi_also)
}
void
-Amp::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_frame*/, double /*speed*/, pframes_t nframes, bool)
+Amp::run (BufferSet& bufs, samplepos_t /*start_sample*/, samplepos_t /*end_sample*/, double /*speed*/, pframes_t nframes, bool)
{
if (!_active && !_pending_active) {
+ /* disregard potentially prepared gain-automation. */
+ _apply_gain_automation = false;
return;
}
}
}
-
- const double a = 156.825 / _session.nominal_frame_rate(); // 25 Hz LPF; see Amp::apply_gain for details
- double lpf = _current_gain;
+ const gain_t a = 156.825f / (gain_t)_session.nominal_sample_rate(); // 25 Hz LPF; see Amp::apply_gain for details
+ gain_t lpf = _current_gain;
for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
Sample* const sp = i->data();
}
}
- if (fabs (lpf) < GAIN_COEFF_TINY) {
+ if (fabsf (lpf) < GAIN_COEFF_SMALL) {
_current_gain = GAIN_COEFF_ZERO;
} else {
_current_gain = lpf;
}
+ /* used it, don't do it again until setup_gain_automation() is
+ * called successfully.
+ */
+ _apply_gain_automation = false;
+
} else { /* manual (scalar) gain */
- gain_t const dg = _gain_control->get_value();
+ gain_t const target_gain = _gain_control->get_value();
- if (_current_gain != dg) {
+ if (fabsf (_current_gain - target_gain) >= GAIN_COEFF_DELTA) {
- _current_gain = Amp::apply_gain (bufs, _session.nominal_frame_rate(), nframes, _current_gain, dg, _midi_amp);
+ _current_gain = Amp::apply_gain (bufs, _session.nominal_sample_rate(), nframes, _current_gain, target_gain, _midi_amp);
/* see note in PluginInsert::connect_and_run ()
* set_value_unchecked() won't emit a signal since the value is effectively unchanged
*/
_gain_control->Changed (false, PBD::Controllable::NoGroup);
- } else if (_current_gain != GAIN_COEFF_UNITY) {
+ } else if (target_gain != GAIN_COEFF_UNITY) {
- /* gain has not changed, but its non-unity */
+ _current_gain = target_gain;
if (_midi_amp) {
/* don't Trim midi velocity -- only relevant for Midi on Audio tracks */
for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
apply_gain_to_buffer (i->data(), nframes, _current_gain);
}
+ } else {
+ /* unity target gain */
+ _current_gain = target_gain;
}
}
}
gain_t
-Amp::apply_gain (BufferSet& bufs, framecnt_t sample_rate, framecnt_t nframes, gain_t initial, gain_t target, bool midi_amp)
+Amp::apply_gain (BufferSet& bufs, samplecnt_t sample_rate, samplecnt_t nframes, gain_t initial, gain_t target, bool midi_amp)
{
- /** Apply a (potentially) declicked gain to the buffers of @a bufs */
+ /** Apply a (potentially) declicked gain to the buffers of @a bufs */
gain_t rv = target;
if (nframes == 0 || bufs.count().n_total() == 0) {
/* 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
+ const gain_t a = 156.825f / (gain_t)sample_rate; // 25 Hz LPF
for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i) {
Sample* const buffer = i->data();
rv = lpf;
}
}
- if (fabsf (rv - target) < GAIN_COEFF_TINY) return target;
- if (fabsf (rv) < GAIN_COEFF_TINY) return GAIN_COEFF_ZERO;
+ if (fabsf (rv - target) < GAIN_COEFF_DELTA) return target;
return rv;
}
void
-Amp::declick (BufferSet& bufs, framecnt_t nframes, int dir)
+Amp::declick (BufferSet& bufs, samplecnt_t nframes, int dir)
{
if (nframes == 0 || bufs.count().n_total() == 0) {
return;
}
- const framecnt_t declick = std::min ((framecnt_t) 512, nframes);
+ const samplecnt_t declick = std::min ((samplecnt_t) 512, nframes);
const double fractional_shift = 1.0 / declick ;
gain_t delta, initial;
if (dir < 0) {
/* fade out: remove more and more of delta from initial */
delta = -1.0;
- initial = GAIN_COEFF_UNITY;
+ initial = GAIN_COEFF_UNITY;
} else {
/* fade in: add more and more of delta from initial */
delta = 1.0;
- initial = GAIN_COEFF_ZERO;
+ initial = GAIN_COEFF_ZERO;
}
/* Audio Gain */
/* 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));
+ 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)
+Amp::apply_gain (AudioBuffer& buf, samplecnt_t sample_rate, samplecnt_t nframes, gain_t initial, gain_t target)
{
- /* Apply a (potentially) declicked gain to the contents of @a buf
+ /* Apply a (potentially) declicked gain to the contents of @a buf
* -- used by MonitorProcessor::run()
*/
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
+ Sample* const buffer = buf.data();
+ const gain_t a = 156.825f / (gain_t)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;
+ gain_t 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;
+ if (fabsf (lpf - target) < GAIN_COEFF_DELTA) return target;
return lpf;
}
void
-Amp::apply_simple_gain (BufferSet& bufs, framecnt_t nframes, gain_t target, bool midi_amp)
+Amp::apply_simple_gain (BufferSet& bufs, samplecnt_t nframes, gain_t target, bool midi_amp)
{
if (fabsf (target) < GAIN_COEFF_SMALL) {
}
void
-Amp::apply_simple_gain (AudioBuffer& buf, framecnt_t nframes, gain_t target)
+Amp::apply_simple_gain (AudioBuffer& buf, samplecnt_t nframes, gain_t target)
{
if (fabsf (target) < GAIN_COEFF_SMALL) {
- memset (buf.data(), 0, sizeof (Sample) * nframes);
+ memset (buf.data(), 0, sizeof (Sample) * nframes);
} else if (target != GAIN_COEFF_UNITY) {
- apply_gain_to_buffer (buf.data(), nframes, target);
+ apply_gain_to_buffer (buf.data(), nframes, target);
}
}
XMLNode&
-Amp::state (bool full_state)
+Amp::state ()
{
- XMLNode& node (Processor::state (full_state));
+ XMLNode& node (Processor::state ());
node.set_property("type", _gain_control->parameter().type() == GainAutomation ? "amp" : "trim");
node.add_child_nocopy (_gain_control->get_state());
/** 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).
+ *
+ * After calling this, the gain-automation buffer is valid for the next run.
+ * so make sure to call ::run() which invalidates the buffer again.
*/
void
-Amp::setup_gain_automation (framepos_t start_frame, framepos_t end_frame, framecnt_t nframes)
+Amp::setup_gain_automation (samplepos_t start_sample, samplepos_t end_sample, samplecnt_t nframes)
{
Glib::Threads::Mutex::Lock am (control_lock(), Glib::Threads::TRY_LOCK);
{
assert (_gain_automation_buffer);
- _apply_gain_automation = _gain_control->get_masters_curve ( start_frame, end_frame, _gain_automation_buffer, nframes);
+ _apply_gain_automation = _gain_control->get_masters_curve ( start_sample, end_sample, _gain_automation_buffer, nframes);
- if (start_frame != _current_automation_frame && _session.bounce_processing ()) {
+ if (start_sample != _current_automation_sample && _session.bounce_processing ()) {
_current_gain = _gain_automation_buffer[0];
}
- _current_automation_frame = end_frame;
+ _current_automation_sample = end_sample;
} else {
_apply_gain_automation = false;
- _current_automation_frame = INT64_MAX;
+ _current_automation_sample = INT64_MAX;
}
}
* 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)
{
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