/*
- 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.
using namespace std;
-namespace ARDOUR {
+using namespace ARDOUR;
+
+sigc::signal<void> Metering::Meter;
+Glib::StaticMutex Metering::m_meter_signal_lock;
+
+sigc::connection
+Metering::connect (sigc::slot<void> the_slot)
+{
+ // SignalProcessor::Meter is emitted from another thread so the
+ // Meter signal must be protected.
+ Glib::Mutex::Lock guard (m_meter_signal_lock);
+ return Meter.connect (the_slot);
+}
+
+void
+Metering::disconnect (sigc::connection& c)
+{
+ Glib::Mutex::Lock guard (m_meter_signal_lock);
+ c.disconnect ();
+}
+
+/**
+ Update the meters.
+ The meter signal lock is taken to prevent modification of the
+ Meter signal while updating the meters, taking the meter signal
+ lock prior to taking the io_lock ensures that all IO will remain
+ valid while metering.
+*/
+void
+Metering::update_meters()
+{
+ Glib::Mutex::Lock guard (m_meter_signal_lock);
+ Meter(); /* EMIT SIGNAL */
+}
/** Get peaks from @a bufs
* Input acceptance is lenient - the first n buffers from @a bufs will
* be set to 0.
*/
void
-PeakMeter::run_in_place (BufferSet& bufs, nframes_t start_frame, nframes_t end_frame, nframes_t nframes)
+PeakMeter::run (BufferSet& bufs, sframes_t /*start_frame*/, sframes_t /*end_frame*/, nframes_t nframes)
{
+ if (!_active && !_pending_active) {
+ return;
+ }
+
const uint32_t n_audio = min(_configured_input.n_audio(), bufs.count().n_audio());
const uint32_t n_midi = min(_configured_input.n_midi(), bufs.count().n_midi());
-
+
uint32_t n = 0;
-
+
// Meter MIDI in to the first n_midi peaks
for (uint32_t i = 0; i < n_midi; ++i, ++n) {
float val = 0.0f;
// Meter audio in to the rest of the peaks
for (uint32_t i = 0; i < n_audio; ++i, ++n) {
- _peak_power[n] = compute_peak (bufs.get_audio(i).data(), nframes, _peak_power[n]);
+ _peak_power[n] = compute_peak (bufs.get_audio(i).data(), nframes, _peak_power[n]);
}
// Zero any excess peaks
for (uint32_t i = n; i < _peak_power.size(); ++i) {
_peak_power[i] = 0.0f;
}
+
+ _active = _pending_active;
+}
+
+PeakMeter::PeakMeter (Session& s, const XMLNode& node)
+ : Processor (s, node)
+{
}
void
if (out != in) { // always 1:1
return false;
}
-
+
uint32_t limit = in.n_total();
-
+
while (_peak_power.size() > limit) {
_peak_power.pop_back();
_visible_peak_power.pop_back();
}
/** To be driven by the Meter signal from IO.
- * Caller MUST hold io_lock!
+ * Caller MUST hold its own processor_lock to prevent reconfiguration
+ * of meter size during this call.
*/
+
void
PeakMeter::meter ()
{
+ if (!_active) {
+ return;
+ }
+
assert(_visible_peak_power.size() == _peak_power.size());
const size_t limit = _peak_power.size();
for (size_t n = 0; n < limit; ++n) {
- /* XXX we should use atomic exchange here */
-
/* grab peak since last read */
- float new_peak = _peak_power[n];
- _peak_power[n] = 0;
-
+ float new_peak = _peak_power[n]; /* XXX we should use atomic exchange from here ... */
+ _peak_power[n] = 0; /* ... to here */
+
/* compute new visible value using falloff */
if (new_peak > 0.0) {
- new_peak = coefficient_to_dB (new_peak);
+ new_peak = fast_coefficient_to_dB (new_peak);
} else {
new_peak = minus_infinity();
}
-
+
/* update max peak */
-
+
_max_peak_power[n] = std::max (new_peak, _max_peak_power[n]);
-
+
if (Config->get_meter_falloff() == 0.0f || new_peak > _visible_peak_power[n]) {
_visible_peak_power[n] = new_peak;
} else {
XMLNode&
PeakMeter::state (bool full_state)
{
- return get_state();
+ XMLNode& node (Processor::state (full_state));
+ node.add_property("type", "meter");
+ return node;
}
-XMLNode&
-PeakMeter::get_state()
+
+bool
+PeakMeter::visible() const
{
- XMLNode* node = new XMLNode(state_node_name);
- node->add_property("type", "meter");
- return *node;
+ return true;
}
-
-} // namespace ARDOUR