imdct_step3_inner_s_loop()

static void fl::third_party::vorbis::imdct_step3_inner_s_loop ( int32_t n, float * e, int32_t i_off, int32_t k_off, float * A, int32_t a_off, int32_t k0 )

static

Definition at line 2231 of file stb_vorbis.cpp.hpp.

{
   int32_t i;
   // Renamed from A0-A7 to avoid conflict with Arduino analog pin macros
   float aa0 = A[0];
   float aa1 = A[0+1];
   float aa2 = A[0+a_off];
   float aa3 = A[0+a_off+1];
   float aa4 = A[0+a_off*2+0];
   float aa5 = A[0+a_off*2+1];
   float aa6 = A[0+a_off*3+0];
   float aa7 = A[0+a_off*3+1];
 
   float k00,k11;
 
   float *ee0 = e  +i_off;
   float *ee2 = ee0+k_off;
 
   for (i=n; i > 0; --i) {
      k00     = ee0[ 0] - ee2[ 0];
      k11     = ee0[-1] - ee2[-1];
      ee0[ 0] =  ee0[ 0] + ee2[ 0];
      ee0[-1] =  ee0[-1] + ee2[-1];
      ee2[ 0] = (k00) * aa0 - (k11) * aa1;
      ee2[-1] = (k11) * aa0 + (k00) * aa1;
 
      k00     = ee0[-2] - ee2[-2];
      k11     = ee0[-3] - ee2[-3];
      ee0[-2] =  ee0[-2] + ee2[-2];
      ee0[-3] =  ee0[-3] + ee2[-3];
      ee2[-2] = (k00) * aa2 - (k11) * aa3;
      ee2[-3] = (k11) * aa2 + (k00) * aa3;
 
      k00     = ee0[-4] - ee2[-4];
      k11     = ee0[-5] - ee2[-5];
      ee0[-4] =  ee0[-4] + ee2[-4];
      ee0[-5] =  ee0[-5] + ee2[-5];
      ee2[-4] = (k00) * aa4 - (k11) * aa5;
      ee2[-5] = (k11) * aa4 + (k00) * aa5;
 
      k00     = ee0[-6] - ee2[-6];
      k11     = ee0[-7] - ee2[-7];
      ee0[-6] =  ee0[-6] + ee2[-6];
      ee0[-7] =  ee0[-7] + ee2[-7];
      ee2[-6] = (k00) * aa6 - (k11) * aa7;
      ee2[-7] = (k11) * aa6 + (k00) * aa7;
 
      ee0 -= k0;
      ee2 -= k0;
   }
}

References FL_NOEXCEPT.

Referenced by inverse_mdct().

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