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.
+ // 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 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 () {
}
};
-// 40.24 fixpoint math
-#define FIXPOINT_ONE 0x1000000
-
-class FixedPointLinearInterpolation : public Interpolation {
- protected:
- /// speed in fixed point math
- uint64_t phi;
-
- /// target speed in fixed point math
- uint64_t target_phi;
-
- std::vector<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:
-
- FixedPointLinearInterpolation () : phi (FIXPOINT_ONE), target_phi (FIXPOINT_ONE) {}
-
- void set_speed (double new_speed) {
- target_phi = (uint64_t) (FIXPOINT_ONE * fabs(new_speed));
- phi = target_phi;
- }
-
- uint64_t get_phi() { return phi; }
- uint64_t get_target_phi() { return target_phi; }
- uint64_t get_last_phase() { assert(last_phase.size()); return last_phase[0]; }
- void set_last_phase(uint64_t phase) { assert(last_phase.size()); last_phase[0] = phase; }
-
- void add_channel_to (int input_buffer_size, int output_buffer_size);
- void remove_channel_from ();
-
- nframes_t interpolate (int channel, nframes_t nframes, Sample* input, Sample* output);
- void reset ();
-};
-
class LinearInterpolation : public Interpolation {
- protected:
-
public:
nframes_t interpolate (int channel, nframes_t nframes, Sample* input, Sample* output);
};
class CubicInterpolation : public Interpolation {
- protected:
- // shamelessly ripped from Steve Harris' swh-plugins
- static inline float cube_interp(const float fr, const float inm1, const float
- in, const float inp1, const float inp2)
- {
- return in + 0.5f * fr * (inp1 - inm1 +
- fr * (4.0f * inp1 + 2.0f * inm1 - 5.0f * in - inp2 +
- fr * (3.0f * (in - inp1) - inm1 + inp2)));
- }
-
public:
nframes_t interpolate (int channel, nframes_t nframes, Sample* input, Sample* output);
};
-
-
-/**
- * @class SplineInterpolation
- *
- * @brief interpolates using cubic spline interpolation over an input period
- *
- * Splines are piecewise cubic functions between each samples,
- * where the cubic polynomials' values, first and second derivatives are equal
- * on each sample point.
- *
- * The interpolation polynomial in the i-th interval then has the form
- * p_i(x) = a3 (x - i)^3 + a2 (x - i)^2 + a1 (x - i) + a0
- * = ((a3 * (x - i) + a2) * (x - i) + a1) * (x - i) + a0
- * where
- * a3 = (M[i+1] - M[i]) / 6
- * a2 = M[i] / 2
- * a1 = y[i+1] - y[i] - M[i+1]/6 - M[i]/3
- * a0 = y[i]
- *
- * The M's are calculated recursively:
- * M[i+2] = 6.0 * (y[i] - 2y[i+1] + y[i+2]) - 4M[i+1] - M[i]
- *
- */
-class SplineInterpolation : public Interpolation {
- protected:
- double M[2];
-
- public:
- void reset ();
- SplineInterpolation();
- nframes_t interpolate (int channel, nframes_t nframes, Sample* input, Sample* output);
-};
-
-class LibSamplerateInterpolation : public Interpolation {
- protected:
- std::vector<SRC_STATE*> state;
- std::vector<SRC_DATA*> data;
-
- int error;
-
- void reset_state ();
-
- public:
- LibSamplerateInterpolation ();
- ~LibSamplerateInterpolation ();
-
- void set_speed (double new_speed);
- void set_target_speed (double new_speed) {}
- double speed () const { return _speed; }
-
- void add_channel_to (int input_buffer_size, int output_buffer_size);
- void remove_channel_from ();
-
- nframes_t interpolate (int channel, nframes_t nframes, Sample* input, Sample* output);
- void reset() { reset_state (); }
-};
} // namespace ARDOUR
projects / ardour.git / blobdiff