imdct12()

static __inline void fl::third_party::imdct12 ( int32_t * x, int32_t * out )

static

Definition at line 485 of file imdct.hpp.

{
    int32_t a0, a1, a2;
    int32_t x0, x1, x2, x3, x4, x5;
 
    x0 = *x;   x+=3;  x1 = *x;   x+=3;
    x2 = *x;   x+=3;  x3 = *x;   x+=3;
    x4 = *x;   x+=3;  x5 = *x;   x+=3;
 
    x4 -= x5;
    x3 -= x4;
    x2 -= x3;
    x3 -= x5;
    x1 -= x2;
    x0 -= x1;
    x1 -= x3;
 
    x0 >>= 1;
    x1 >>= 1;
 
    a0 = MULSHIFT32(c3_0, x2) * 2L;
    a1 = x0 + (x4 >> 1);
    a2 = x0 - x4;
    x0 = a1 + a0;
    x2 = a2;
    x4 = a1 - a0;
 
    a0 = MULSHIFT32(c3_0, x3) * 2L;
    a1 = x1 + (x5 >> 1);
    a2 = x1 - x5;
 
    /* cos window odd samples, mul by 2, eat sign bit */
    x1 = MULSHIFT32(c6[0], a1 + a0) * 4L;
    x3 = MULSHIFT32(c6[1], a2) * 4L;
    x5 = MULSHIFT32(c6[2], a1 - a0) * 4L;
 
    *out = x0 + x1; out++;
    *out = x2 + x3; out++;
    *out = x4 + x5; out++;
    *out = x4 - x5; out++;
    *out = x2 - x3; out++;
    *out = x0 - x1;
}

References c3_0, c6, FL_NOEXCEPT, MULSHIFT32(), and fl::x.

Referenced by IMDCT12x3().

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