a more-likely-to-be-correct version of swing quantization.
This needs to be converted to fixed point, still.
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@ -52,6 +52,63 @@ Quantize::~Quantize ()
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{
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{
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}
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}
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static double
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swing_position (double pos, double grid, double swing, double offset)
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{
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/* beats start out numbered at zero.
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*
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* every other position on the start-quantize-grid is
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* optionally swung, meaning that its position is moved
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* somewhere between its natural position and 2/3 of
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* the way to the next start-quantize-grid position.
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*
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* so, if the _start grid is 0.5, the beat at 0 isn't
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* swung, but something at 0.5 is, the beat at 1 isn't
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* swung, but something at 1.5 is.
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*
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* if the start grid is 1.0, the beat at 0 isn't swung,
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* but the beat at 1.0 is. the beat at 2.0 isn't swung,
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* but the beat at 3.0 is. and so on.
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*
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* so the criterion for a position being swung is
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* whether or not ((possible_grid_position / grid) % 2) != 0
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*/
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const bool swing_quantize_grid_position = pos > 0.0 && fmod ((pos/grid), 2.0) != 0;
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const bool swing_previous_grid_position = pos > grid && fmod ((pos-grid)/grid, 2.0) != 0;
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/* one of these will not be subject to swing */
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double swung_pos = pos;
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double swung_previous_grid_position;
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if (pos > grid) {
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swung_previous_grid_position = pos - grid;
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} else {
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swung_previous_grid_position = 0.0;
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}
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if (swing_previous_grid_position) {
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swung_previous_grid_position = swung_previous_grid_position + (2.0/3.0 * swing * grid);
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}
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if (swing_quantize_grid_position) {
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swung_pos = swung_pos + (2.0/3.0 * swing * grid);
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}
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/* now correct for start-of-model offset */
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pos += offset;
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if (fabs (pos - swung_pos) > fabs (pos - swung_previous_grid_position)) {
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pos = swung_previous_grid_position;
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} else {
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pos = swung_pos;
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}
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return pos;
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}
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Command*
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Command*
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Quantize::operator () (boost::shared_ptr<MidiModel> model,
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Quantize::operator () (boost::shared_ptr<MidiModel> model,
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Evoral::Beats position,
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Evoral::Beats position,
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@ -66,47 +123,38 @@ Quantize::operator () (boost::shared_ptr<MidiModel> model,
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const double round_pos = round(position.to_double() / _start_grid) * _start_grid;
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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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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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MidiModel::NoteDiffCommand* cmd = new MidiModel::NoteDiffCommand (model, "quantize");
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for (std::vector<Evoral::Sequence<Evoral::Beats>::Notes>::iterator s = seqs.begin(); s != seqs.end(); ++s) {
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for (std::vector<Evoral::Sequence<Evoral::Beats>::Notes>::iterator s = seqs.begin(); s != seqs.end(); ++s) {
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even = false;
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;
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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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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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/* compute new start + end points WITHOUT the offset
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double new_end = round (((*i)->end_time().to_double() - offset) / _end_grid) * _end_grid + offset;
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* caused by the start of the model (see above).
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*
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* these versions of new_start and new_end are
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* guaranteed to precisely align with the quantize grid(s).
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*/
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double new_start = round (((*i)->time().to_double() - offset) / _start_grid) * _start_grid;
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double new_end = round (((*i)->end_time().to_double() - offset) / _end_grid) * _end_grid;
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if (_swing > 0.0 && even) {
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if (_swing) {
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double next_grid = new_start + _start_grid;
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new_start = swing_position (new_start, _start_grid, _swing, offset);
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new_end = swing_position (new_end, _end_grid, _swing, offset);
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} else {
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/* find a spot 2/3 (* swing factor) of the way between the grid point
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/* now correct for start-of-model offset */
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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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new_start += offset;
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new_end += offset;
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}
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}
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double delta = new_start - (*i)->time().to_double();
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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 (fabs (delta) >= _threshold) {
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if (_snap_start) {
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if (_snap_start) {
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delta *= _strength;
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delta *= _strength;
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@ -128,8 +176,6 @@ Quantize::operator () (boost::shared_ptr<MidiModel> model,
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cmd->change ((*i), MidiModel::NoteDiffCommand::Length, new_dur);
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cmd->change ((*i), MidiModel::NoteDiffCommand::Length, new_dur);
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}
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}
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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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}
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}
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