From 449aab3c465bbbf66d221fac3d7ea559f1720357 Mon Sep 17 00:00:00 2001 From: Paul Davis Date: Mon, 2 Jun 2008 21:41:35 +0000 Subject: rollback to 3428, before the mysterious removal of libs/* at 3431/3432 git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf --- libs/ardour/meter.cc | 165 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 165 insertions(+) create mode 100644 libs/ardour/meter.cc (limited to 'libs/ardour/meter.cc') diff --git a/libs/ardour/meter.cc b/libs/ardour/meter.cc new file mode 100644 index 0000000000..e75c1d89ca --- /dev/null +++ b/libs/ardour/meter.cc @@ -0,0 +1,165 @@ +/* + 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 +#include +#include +#include +#include +#include +#include + +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 MIDI::Event& 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 -- cgit v1.2.3