X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fardour%2Fardour%2Finterpolation.h;h=488a5fe5b40c7a1c287131d546c2547e8435e349;hb=7a524285385d4581ad3f1e085629379e32f82fda;hp=5bcb7925cb7741238a948444549df813bceea89c;hpb=c04e57125baa174158448cfe6b1f72a5f6cee251;p=ardour.git

diff --git a/libs/ardour/ardour/interpolation.h b/libs/ardour/ardour/interpolation.h
index 5bcb7925cb..488a5fe5b4 100644
--- a/libs/ardour/ardour/interpolation.h
+++ b/libs/ardour/ardour/interpolation.h
@@ -20,6 +20,7 @@
 #include <math.h>
 #include <samplerate.h>
 
+#include "ardour/libardour_visibility.h"
 #include "ardour/types.h"
 
 #ifndef __interpolation_h__
@@ -27,7 +28,7 @@
 
 namespace ARDOUR {
 
-class Interpolation {
+class LIBARDOUR_API Interpolation {
 protected:
 	double _speed;
 	double _target_speed;
@@ -39,32 +40,39 @@ protected:
 
 public:
 	Interpolation ()  { _speed = 1.0; _target_speed = 1.0; }
-	~Interpolation () { phase.clear(); }
+	virtual ~Interpolation() {}
 
 	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 () {
+
+	void add_channel ()    { phase.push_back (0.0); }
+	void remove_channel () { phase.pop_back (); }
+
+	virtual void reset () {
 		for (size_t i = 0; i < phase.size(); i++) {
 			phase[i] = 0.0;
 		}
 	}
 };
 
-class LinearInterpolation : public Interpolation {
-public:
-	framecnt_t interpolate (int channel, framecnt_t nframes, Sample* input, Sample* output);
-};
-
-class CubicInterpolation : public Interpolation {
-public:
-	framecnt_t interpolate (int channel, framecnt_t nframes, Sample* input, Sample* output);
+class LIBARDOUR_API CubicInterpolation : public Interpolation {
+  public:
+	CubicInterpolation ();
+	samplecnt_t interpolate (int channel, samplecnt_t input_samples, Sample* input, samplecnt_t & output_samples, Sample* output);
+	samplecnt_t distance (samplecnt_t nframes);
+	void reset ();
+
+  private:
+	Sample z[4];
+	char   valid_z_bits;
+
+	bool is_valid (int n) const { return valid_z_bits & (1<<n); }
+	bool invalid (int n) const  { return !is_valid (n); }
+	void validate (int n)       { valid_z_bits |= (1<<n); }
+	void invalidate (int n)     { valid_z_bits &= (1<<n); }
 };
 
 } // namespace ARDOUR