#include <math.h>
+#include <samplerate.h>
+
#include "ardour/types.h"
#ifndef __interpolation_h__
namespace ARDOUR {
class Interpolation {
-protected:
- double _speed, _target_speed;
-
-public:
- Interpolation () : _speed(0.0L) {}
-
- void set_speed (double new_speed) { _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; }
-
- virtual nframes_t interpolate (nframes_t nframes, Sample* input, Sample* output) = 0;
+ protected:
+ double _speed, _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 LinearInterpolation : public Interpolation {
-public:
- nframes_t interpolate (nframes_t nframes, Sample* input, Sample* output);
+ public:
+ nframes_t interpolate (int channel, nframes_t nframes, Sample* input, Sample* output);
+};
+
+class CubicInterpolation : public Interpolation {
+ public:
+ nframes_t interpolate (int channel, nframes_t nframes, Sample* input, Sample* output);
};
} // namespace ARDOUR
-#endif
\ No newline at end of file
+#endif