+/*
+ Copyright (C) 1999-2010 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 <math.h>
-//#include "ardour/types.h"
-
-typedef float Sample;
-#define nframes_t uint32_t
-
-// 40.24 fixpoint math
-#define FIXPOINT_ONE 0x1000000
-
-class Interpolation {
- protected:
- /// speed in fixed point math
- uint64_t phi;
-
- /// target speed in fixed point math
- uint64_t target_phi;
-
- uint64_t last_phase;
-
- // Fixed point is just an integer with an implied scaling factor.
- // In 40.24 the scaling factor is 2^24 = 16777216,
- // so a value of 10*2^24 (in integer space) is equivalent to 10.0.
- //
- // The advantage is that addition and modulus [like x = (x + y) % 2^40]
- // have no rounding errors and no drift, and just require a single integer add.
- // (swh)
-
- static const int64_t fractional_part_mask = 0xFFFFFF;
- static const Sample binary_scaling_factor = 16777216.0f;
-
- public:
- Interpolation () : phi (FIXPOINT_ONE), target_phi (FIXPOINT_ONE), last_phase (0) {}
-
- void set_speed (double new_speed) {
- target_phi = (uint64_t) (FIXPOINT_ONE * fabs(new_speed));
- phi = target_phi;
- }
-
- uint64_t get_phi () const { return phi; }
- uint64_t get_target_phi () const { return target_phi; }
- uint64_t get_last_phase () const { return last_phase; }
-
- virtual nframes_t interpolate (nframes_t nframes, Sample* input, Sample* output) = 0;
+#include <samplerate.h>
+
+#include "ardour/libardour_visibility.h"
+#include "ardour/types.h"
+
+#ifndef __interpolation_h__
+#define __interpolation_h__
+
+namespace ARDOUR {
+
+class LIBARDOUR_API Interpolation {
+protected:
+ double _speed;
+ double _target_speed;
+
+ // the idea is that when the speed is not 1.0, we have to
+ // interpolate between samples and then we have to store where we thought we were.
+ // rather than being at sample N or N+1, we were at N+0.8792922
+ std::vector<double> phase;
+
+public:
+ Interpolation () { _speed = 1.0; _target_speed = 1.0; }
+ ~Interpolation () { phase.clear(); }
+
+ void set_speed (double new_speed) { _speed = new_speed; _target_speed = new_speed; }
+ void set_target_speed (double new_speed) { _target_speed = new_speed; }
+
+ double target_speed() const { return _target_speed; }
+ double speed() const { return _speed; }
+
+ void add_channel_to (int /*input_buffer_size*/, int /*output_buffer_size*/) { phase.push_back (0.0); }
+ void remove_channel_from () { phase.pop_back (); }
+
+ void reset () {
+ for (size_t i = 0; i < phase.size(); i++) {
+ phase[i] = 0.0;
+ }
+ }
+};
+
+class LIBARDOUR_API LinearInterpolation : public Interpolation {
+public:
+ framecnt_t interpolate (int channel, framecnt_t nframes, Sample* input, Sample* output);
};
-class LinearInterpolation : public Interpolation {
- public:
- nframes_t interpolate (nframes_t nframes, Sample* input, Sample* output);
+class LIBARDOUR_API CubicInterpolation : public Interpolation {
+public:
+ framecnt_t interpolate (int channel, framecnt_t nframes, Sample* input, Sample* output);
};
+
+class BufferSet;
+
+class LIBARDOUR_API CubicMidiInterpolation : public Interpolation {
+public:
+ framecnt_t distance (framecnt_t nframes, bool roll = true);
+};
+
+} // namespace ARDOUR
+
+#endif
projects / ardour.git / blobdiff