David Robillard
7eadc684a5
git-svn-id: svn://localhost/ardour2/branches/3.0@3826 d708f5d6-7413-0410-9779-e7cbd77b26cf
167 lines
4.2 KiB
C++
167 lines
4.2 KiB
C++
/*
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Copyright (C) 2006 Paul Davis
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <ardour/meter.h>
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#include <algorithm>
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#include <cmath>
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#include <ardour/buffer_set.h>
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#include <ardour/peak.h>
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#include <ardour/dB.h>
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#include <ardour/session.h>
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namespace ARDOUR {
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/** Get peaks from @a bufs
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* Input acceptance is lenient - the first n buffers from @a bufs will
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* be metered, where n was set by the last call to setup(), excess meters will
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* be set to 0.
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*/
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void
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PeakMeter::run_in_place (BufferSet& bufs, nframes_t start_frame, nframes_t end_frame, nframes_t nframes, nframes_t offset)
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{
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uint32_t n = 0;
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uint32_t meterable = std::min(bufs.count().n_total(), (uint32_t)_peak_power.size());
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uint32_t limit = std::min (meterable, (uint32_t)bufs.count().n_midi());
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// Meter what we have (midi)
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for ( ; n < limit; ++n) {
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float val = 0;
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// GUI needs a better MIDI meter, not much information can be
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// expressed through peaks alone
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for (MidiBuffer::iterator i = bufs.get_midi(n).begin(); i != bufs.get_midi(n).end(); ++i) {
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const Evoral::MIDIEvent& ev = *i;
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if (ev.is_note_on()) {
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const float this_vel = log(ev.buffer()[2] / 127.0 * (M_E*M_E-M_E) + M_E) - 1.0;
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//printf("V %d -> %f\n", (int)((Byte)ev.buffer[2]), this_vel);
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if (this_vel > val)
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val = this_vel;
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} else {
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val += 1.0 / bufs.get_midi(n).capacity();
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if (val > 1.0)
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val = 1.0;
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}
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}
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_peak_power[n] = val;
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}
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limit = std::min (meterable, bufs.count().n_audio());
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// Meter what we have (audio)
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for ( ; n < limit; ++n) {
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_peak_power[n] = compute_peak (bufs.get_audio(n).data(nframes, offset), nframes, _peak_power[n]);
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}
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// Zero any excess peaks
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for (size_t n = meterable; n < _peak_power.size(); ++n) {
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_peak_power[n] = 0;
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}
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}
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void
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PeakMeter::reset ()
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{
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for (size_t i = 0; i < _peak_power.size(); ++i) {
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_peak_power[i] = 0;
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}
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}
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void
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PeakMeter::reset_max ()
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{
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for (size_t i = 0; i < _max_peak_power.size(); ++i) {
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_max_peak_power[i] = -INFINITY;
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}
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}
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bool
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PeakMeter::configure_io (ChanCount in, ChanCount out)
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{
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/* we're transparent no matter what. fight the power. */
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if (out != in) {
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return false;
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}
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uint32_t limit = in.n_total();
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while (_peak_power.size() > limit) {
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_peak_power.pop_back();
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_visible_peak_power.pop_back();
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_max_peak_power.pop_back();
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}
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while (_peak_power.size() < limit) {
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_peak_power.push_back(0);
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_visible_peak_power.push_back(minus_infinity());
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_max_peak_power.push_back(minus_infinity());
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}
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assert(_peak_power.size() == limit);
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assert(_visible_peak_power.size() == limit);
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assert(_max_peak_power.size() == limit);
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return Processor::configure_io (in, out);
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}
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/** To be driven by the Meter signal from IO.
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* Caller MUST hold io_lock!
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*/
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void
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PeakMeter::meter ()
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{
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assert(_visible_peak_power.size() == _peak_power.size());
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const size_t limit = _peak_power.size();
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for (size_t n = 0; n < limit; ++n) {
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/* XXX we should use atomic exchange here */
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/* grab peak since last read */
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float new_peak = _peak_power[n];
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_peak_power[n] = 0;
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/* compute new visible value using falloff */
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if (new_peak > 0.0) {
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new_peak = coefficient_to_dB (new_peak);
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} else {
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new_peak = minus_infinity();
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}
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/* update max peak */
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_max_peak_power[n] = std::max (new_peak, _max_peak_power[n]);
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if (Config->get_meter_falloff() == 0.0f || new_peak > _visible_peak_power[n]) {
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_visible_peak_power[n] = new_peak;
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} else {
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// do falloff
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new_peak = _visible_peak_power[n] - (Config->get_meter_falloff() * 0.01f);
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_visible_peak_power[n] = std::max (new_peak, -INFINITY);
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}
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}
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}
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} // namespace ARDOUR
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