83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
/*
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* Copyright (C) 2009-2010 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2009-2011 David Robillard <d@drobilla.net>
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* Copyright (C) 2009-2017 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2009 Hans Baier <hansfbaier@googlemail.com>
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*
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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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*
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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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*
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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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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <math.h>
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#include <samplerate.h>
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#include "ardour/libardour_visibility.h"
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#include "ardour/types.h"
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#ifndef __interpolation_h__
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#define __interpolation_h__
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namespace ARDOUR {
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class LIBARDOUR_API Interpolation {
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protected:
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double _speed;
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double _target_speed;
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// the idea is that when the speed is not 1.0, we have to
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// interpolate between samples and then we have to store where we thought we were.
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// rather than being at sample N or N+1, we were at N+0.8792922
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std::vector<double> phase;
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public:
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Interpolation () { _speed = 1.0; _target_speed = 1.0; }
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virtual ~Interpolation() {}
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void set_speed (double new_speed) { _speed = new_speed; _target_speed = new_speed; }
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void set_target_speed (double new_speed) { _target_speed = new_speed; }
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double target_speed() const { return _target_speed; }
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double speed() const { return _speed; }
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void add_channel () { phase.push_back (0.0); }
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void remove_channel () { phase.pop_back (); }
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virtual void reset () {
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for (size_t i = 0; i < phase.size(); i++) {
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phase[i] = 0.0;
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}
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}
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};
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class LIBARDOUR_API CubicInterpolation : public Interpolation {
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public:
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CubicInterpolation ();
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samplecnt_t interpolate (int channel, samplecnt_t input_samples, Sample* input, samplecnt_t & output_samples, Sample* output);
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samplecnt_t distance (samplecnt_t nframes);
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void reset ();
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private:
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Sample z[4];
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char valid_z_bits;
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bool is_valid (int n) const { return valid_z_bits & (1<<n); }
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bool invalid (int n) const { return !is_valid (n); }
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void validate (int n) { valid_z_bits |= (1<<n); }
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void invalidate (int n) { valid_z_bits &= (1<<n); }
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};
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} // namespace ARDOUR
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#endif
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