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/*
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 <ardour/meter.h>
#include <algorithm>
#include <cmath>
#include <ardour/buffer_set.h>
#include <ardour/peak.h>
#include <ardour/dB.h>
#include <ardour/session.h>
namespace ARDOUR {
/** Get peaks from @a bufs
* Input acceptance is lenient - the first n buffers from @a bufs will
* be metered, where n was set by the last call to setup(), excess meters will
* be set to 0.
*/
void
PeakMeter::run_in_place (BufferSet& bufs, nframes_t start_frame, nframes_t end_frame, nframes_t nframes, nframes_t offset)
{
size_t meterable = std::min((size_t)bufs.count().n_total(), _peak_power.size());
size_t n = 0;
// Meter what we have (midi)
for ( ; n < meterable && n < bufs.count().n_midi(); ++n) {
float val = 0;
// GUI needs a better MIDI meter, not much information can be
// expressed through peaks alone
for (MidiBuffer::iterator i = bufs.get_midi(n).begin(); i != bufs.get_midi(n).end(); ++i) {
const MidiEvent& ev = *i;
if (ev.is_note_on()) {
const float this_vel = log(ev.buffer()[2] / 127.0 * (M_E*M_E-M_E) + M_E) - 1.0;
//printf("V %d -> %f\n", (int)((Byte)ev.buffer[2]), this_vel);
if (this_vel > val)
val = this_vel;
} else {
val += 1.0 / bufs.get_midi(n).capacity();
if (val > 1.0)
val = 1.0;
}
}
_peak_power[n] = val;
}
// Meter what we have (audio)
for ( ; n < meterable && n < bufs.count().n_audio(); ++n) {
_peak_power[n] = compute_peak (bufs.get_audio(n).data(nframes, offset), nframes, _peak_power[n]);
}
// Zero any excess peaks
for (size_t n = meterable; n < _peak_power.size(); ++n) {
_peak_power[n] = 0;
}
}
void
PeakMeter::reset ()
{
for (size_t i = 0; i < _peak_power.size(); ++i) {
_peak_power[i] = 0;
}
}
void
PeakMeter::reset_max ()
{
for (size_t i = 0; i < _max_peak_power.size(); ++i) {
_max_peak_power[i] = -INFINITY;
}
}
bool
PeakMeter::configure_io (ChanCount in, ChanCount out)
{
/* we're transparent no matter what. fight the power. */
if (out != in)
return false;
uint32_t limit = in.n_total();
while (_peak_power.size() > limit) {
_peak_power.pop_back();
_visible_peak_power.pop_back();
_max_peak_power.pop_back();
}
while (_peak_power.size() < limit) {
_peak_power.push_back(0);
_visible_peak_power.push_back(minus_infinity());
_max_peak_power.push_back(minus_infinity());
}
assert(_peak_power.size() == limit);
assert(_visible_peak_power.size() == limit);
assert(_max_peak_power.size() == limit);
Processor::configure_io(in, out);
return true;
}
/** To be driven by the Meter signal from IO.
* Caller MUST hold io_lock!
*/
void
PeakMeter::meter ()
{
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;
/* compute new visible value using falloff */
if (new_peak > 0.0) {
new_peak = 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 {
// do falloff
new_peak = _visible_peak_power[n] - (Config->get_meter_falloff() * 0.01f);
_visible_peak_power[n] = std::max (new_peak, -INFINITY);
}
}
}
} // namespace ARDOUR
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