streamtools/rescalers/letterbox2.cpp

   1 #include "rescalers/linear-separable.hpp"
   2 #include <stdint.h>
   3 #include <cmath>
   4 #include <stdexcept>
   5
   6 namespace
   7 {
   8         void compute_coefficients_letterbox(float* coeffs, position_t num, position_t denum, position_t width,
   9                 position_t twidth, unsigned& count, unsigned& base)
  10         {
  11                 position_t header = (twidth - width) / 4 * 2;
  12                 position_t relpos = num / width - header;
  13                 *coeffs = 0;
  14                 count = 1;
  15                 base = 0;
  16                 if(relpos >= 0 && relpos < width) {
  17                         *coeffs = 1;
  18                         base = (unsigned)relpos;
  19                 }
  20         }
  21
  22         simple_rescaler_linear_separable r_letterbox("letterbox2", make_bound_method(compute_coefficients_letterbox));
  23 }