75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
/*
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Copyright (C) 2009 Paul Davis
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Author: David Robillard
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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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$Id: midiregion.h 733 2006-08-01 17:19:38Z drobilla $
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*/
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#include "pbd/stacktrace.h"
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#include "ardour/beats_samples_converter.h"
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#include "ardour/tempo.h"
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namespace ARDOUR {
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/** Takes a positive duration in quarter-note beats and considers it as a distance from the origin
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* supplied to the constructor. Returns the equivalent number of samples,
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* taking tempo changes into account.
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*/
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samplepos_t
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BeatsSamplesConverter::to (Temporal::Beats beats) const
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{
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if (beats < Temporal::Beats()) {
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std::cerr << "negative beats passed to BFC: " << beats << std::endl;
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PBD::stacktrace (std::cerr, 30);
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return 0;
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}
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return _tempo_map.samplepos_plus_qn (_origin_b, beats) - _origin_b;
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}
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/** Takes a duration in samples and considers it as a distance from the origin
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* supplied to the constructor. Returns the equivalent number of quarter-note beats,
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* taking tempo changes into account.
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*/
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Temporal::Beats
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BeatsSamplesConverter::from (samplepos_t samples) const
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{
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return _tempo_map.framewalk_to_qn (_origin_b, samples);
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}
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/** As above, but with quarter-note beats in double instead (for GUI). */
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samplepos_t
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DoubleBeatsSamplesConverter::to (double beats) const
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{
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if (beats < 0.0) {
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std::cerr << "negative beats passed to BFC: " << beats << std::endl;
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PBD::stacktrace (std::cerr, 30);
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return 0;
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}
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return _tempo_map.samplepos_plus_qn (_origin_b, Temporal::Beats(beats)) - _origin_b;
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}
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/** As above, but with quarter-note beats in double instead (for GUI). */
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double
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DoubleBeatsSamplesConverter::from (samplepos_t samples) const
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{
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return _tempo_map.framewalk_to_qn (_origin_b, samples).to_double();
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}
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} /* namespace ARDOUR */
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