void ff_horiz_slice_avx2(float *ptr, int width, int height, int steps, float nu, float bscale)
void(* horiz_slice)(float *buffer, int width, int height, int steps, float nu, float bscale)
void ff_horiz_slice_sse4(float *ptr, int width, int height, int steps, float nu, float bscale)
void(* postscale_slice)(float *buffer, int length, float postscale, float min, float max)