138 lines
4.0 KiB
C++
138 lines
4.0 KiB
C++
/*
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Copyright (C) 2004 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <cmath>
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#include "pbd/basename.h"
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#include "ardour/quantize.h"
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#include "ardour/midi_model.h"
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#include "i18n.h"
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using namespace std;
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using namespace PBD;
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using namespace ARDOUR;
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/** Quantize notes
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*
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* grid parameters are the quantize value in beats, ie 1.0 = quantize to beats,
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* 0.25 = quantize to beats/4, etc.
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*/
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Quantize::Quantize (bool snap_start, bool snap_end,
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double start_grid, double end_grid,
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float strength, float swing, float threshold)
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: _snap_start (snap_start)
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, _snap_end (snap_end)
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, _start_grid(start_grid)
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, _end_grid(end_grid)
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, _strength (strength/100.0)
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, _swing (swing/100.0)
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, _threshold (threshold)
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{
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}
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Quantize::~Quantize ()
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{
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}
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Command*
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Quantize::operator () (boost::shared_ptr<MidiModel> model,
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Evoral::MusicalTime position,
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std::vector<Evoral::Sequence<Evoral::MusicalTime>::Notes>& seqs)
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{
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/* TODO: Rewrite this to be precise with fixed point? */
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/* Calculate offset from start of model to next closest quantize step,
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to quantize relative to actual session beats (etc.) rather than from the
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start of the model.
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*/
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const double round_pos = round(position.to_double() / _start_grid) * _start_grid;
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const double offset = round_pos - position.to_double();
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bool even;
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MidiModel::NoteDiffCommand* cmd = new MidiModel::NoteDiffCommand (model, "quantize");
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for (std::vector<Evoral::Sequence<Evoral::MusicalTime>::Notes>::iterator s = seqs.begin(); s != seqs.end(); ++s) {
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even = false;
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/* TODO 'swing' probably requires a 2nd iteration:
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* first quantize notes to the grid, then apply beat shift
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*/
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for (Evoral::Sequence<MidiModel::TimeType>::Notes::iterator i = (*s).begin(); i != (*s).end(); ++i) {
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double new_start = round (((*i)->time().to_double() - offset) / _start_grid) * _start_grid + offset;
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double new_end = round (((*i)->end_time().to_double() - offset) / _end_grid) * _end_grid + offset;
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if (_swing > 0.0 && !even) {
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double next_grid = new_start + _start_grid;
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/* find a spot 2/3 (* swing factor) of the way between the grid point
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we would put this note at, and the nominal position of the next note.
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*/
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new_start = new_start + (2.0/3.0 * _swing * (next_grid - new_start));
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new_end = new_end + (2.0/3.0 * _swing * (next_grid - new_start));
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} else if (_swing < 0.0 && !even) {
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double prev_grid = new_start - _start_grid;
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/* find a spot 2/3 (* swing factor) of the way between the grid point
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we would put this note at, and the nominal position of the previous note.
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*/
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new_start = new_start - (2.0/3.0 * _swing * (new_start - prev_grid));
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new_end = new_end - (2.0/3.0 * _swing * (new_start - prev_grid));
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}
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double delta = new_start - (*i)->time().to_double();
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if (fabs (delta) >= _threshold) {
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if (_snap_start) {
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delta *= _strength;
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cmd->change ((*i), MidiModel::NoteDiffCommand::StartTime,
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(*i)->time() + delta);
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}
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}
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if (_snap_end) {
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delta = new_end - (*i)->end_time().to_double();
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if (fabs (delta) >= _threshold) {
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Evoral::MusicalTime new_dur(new_end - new_start);
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if (!new_dur) {
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new_dur = Evoral::MusicalTime(_end_grid);
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}
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cmd->change ((*i), MidiModel::NoteDiffCommand::Length, new_dur);
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}
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}
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even = !even;
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}
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}
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return cmd;
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}
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