compute_twiddle_factors()

static void fl::third_party::vorbis::compute_twiddle_factors ( int32_t n, float * A, float * B, float * C )

static

Definition at line 978 of file stb_vorbis.cpp.hpp.

{
   int32_t n4 = n >> 2, n8 = n >> 3;
   int32_t k,k2;
 
   for (k=k2=0; k < n4; ++k,k2+=2) {
      A[k2  ] = (float)  cos(4*k*FL_PI/n);
      A[k2+1] = (float) -sin(4*k*FL_PI/n);
      B[k2  ] = (float)  cos((k2+1)*FL_PI/n/2) * 0.5f;
      B[k2+1] = (float)  sin((k2+1)*FL_PI/n/2) * 0.5f;
   }
   for (k=k2=0; k < n8; ++k,k2+=2) {
      C[k2  ] = (float)  cos(2*(k2+1)*FL_PI/n);
      C[k2+1] = (float) -sin(2*(k2+1)*FL_PI/n);
   }
}

References fl::B, C, cos(), FL_NOEXCEPT, FL_PI, and sin().

Referenced by init_blocksize().

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