void idct_8(Int32 vec[])
{
Int32 tmp0;
Int32 tmp1;
Int32 tmp2;
Int32 tmp3;
Int32 tmp4;
Int32 tmp5;
Int32 tmp6;
Int32 tmp7;
Int32 tmp8;
tmp5 = fxp_mul32_by_16(vec[4] << 1, Qfmt15(0.70710678118655F));
tmp1 = vec[0] + tmp5;
tmp5 = vec[0] - tmp5;
tmp3 = fxp_mul32_by_16(vec[2] << 1, Qfmt15(0.54119610014620F)); /* (1/(2*cos(2*phi)));*/
tmp7 = fxp_mul32_Q29(vec[6], Qfmt(1.30656296487638F)); /* (1/(2*cos(6*phi)));*/
tmp0 = fxp_mul32_by_16((tmp3 - tmp7) << 1, Qfmt15(0.70710678118655F)); /* (1/(2*cos(2*phi))); */
tmp7 = (tmp3 + tmp7) + tmp0;
vec[0] = tmp1 + tmp7;
tmp2 = fxp_mul32_by_16(vec[1] << 1, Qfmt15(0.50979557910416F)); /* (1/(2*cos( phi)));*/
vec[1] = tmp5 + tmp0;
vec[2] = tmp5 - tmp0;
tmp4 = fxp_mul32_by_16(vec[3] << 1, Qfmt15(0.60134488693505F)); /* (1/(2*cos(3*phi)));*/
vec[3] = tmp1 - tmp7;
tmp6 = fxp_mul32_by_16(vec[5] << 1, Qfmt15(0.89997622313642F)); /* (1/(2*cos(5*phi)));*/
tmp8 = fxp_mul32_Q29(vec[7], Qfmt(2.56291544774151F)); /* (1/(2*cos(7*phi)));*/
tmp7 = tmp2 + tmp8;
tmp5 = fxp_mul32_by_16((tmp2 - tmp8) << 1, Qfmt15(0.54119610014620F));
tmp8 = tmp4 + tmp6;
tmp6 = fxp_mul32_Q29((tmp4 - tmp6), Qfmt(1.30656296487638F));
tmp0 = tmp7 + tmp8;
tmp2 = fxp_mul32_by_16((tmp7 - tmp8) << 1, Qfmt15(0.70710678118655F));
tmp3 = fxp_mul32_by_16((tmp5 - tmp6) << 1, Qfmt15(0.70710678118655F));
tmp1 = (tmp5 + tmp6) + tmp3;
tmp5 = tmp0 + tmp1;
tmp6 = tmp1 + tmp2;
tmp7 = tmp2 + tmp3;
vec[7] = vec[0] - tmp5;
vec[0] += tmp5;
vec[6] = vec[1] - tmp6;
vec[1] += tmp6;
vec[5] = vec[2] - tmp7;
vec[2] += tmp7;
vec[4] = vec[3] - tmp3;
vec[3] += tmp3;
}
void dct_16(Int32 vec[], Int flag)
{
Int32 tmp0;
Int32 tmp1;
Int32 tmp2;
Int32 tmp3;
Int32 tmp4;
Int32 tmp5;
Int32 tmp6;
Int32 tmp7;
Int32 tmp_o0;
Int32 tmp_o1;
Int32 tmp_o2;
Int32 tmp_o3;
Int32 tmp_o4;
Int32 tmp_o5;
Int32 tmp_o6;
Int32 tmp_o7;
Int32 itmp_e0;
Int32 itmp_e1;
Int32 itmp_e2;
/* split input vector */
tmp_o0 = fxp_mul32_by_16((vec[ 0] - vec[15]), Qfmt15(0.50241928618816F));
tmp0 = vec[ 0] + vec[15];
tmp_o7 = fxp_mul32_Q31((vec[ 7] - vec[ 8]) << 3, Qfmt_31(0.63764357733614F));
tmp7 = vec[ 7] + vec[ 8];
itmp_e0 = (tmp0 + tmp7);
tmp7 = fxp_mul32_by_16((tmp0 - tmp7), Qfmt15(0.50979557910416F));
tmp_o1 = fxp_mul32_by_16((vec[ 1] - vec[14]), Qfmt15(0.52249861493969F));
tmp1 = vec[ 1] + vec[14];
tmp_o6 = fxp_mul32_by_16((vec[ 6] - vec[ 9]) << 1, Qfmt15(0.86122354911916F));
tmp6 = vec[ 6] + vec[ 9];
itmp_e1 = (tmp1 + tmp6);
tmp6 = fxp_mul32_by_16((tmp1 - tmp6), Qfmt15(0.60134488693505F));
tmp_o2 = fxp_mul32_by_16((vec[ 2] - vec[13]), Qfmt15(0.56694403481636F));
tmp2 = vec[ 2] + vec[13];
tmp_o5 = fxp_mul32_by_16((vec[ 5] - vec[10]) << 1, Qfmt15(0.53033884299517F));
tmp5 = vec[ 5] + vec[10];
itmp_e2 = (tmp2 + tmp5);
tmp5 = fxp_mul32_by_16((tmp2 - tmp5), Qfmt15(0.89997622313642F));
tmp_o3 = fxp_mul32_by_16((vec[ 3] - vec[12]), Qfmt15(0.64682178335999F));
tmp3 = vec[ 3] + vec[12];
tmp_o4 = fxp_mul32_by_16((vec[ 4] - vec[11]), Qfmt15(0.78815462345125F));
tmp4 = vec[ 4] + vec[11];
tmp1 = (tmp3 + tmp4);
tmp4 = fxp_mul32_Q31((tmp3 - tmp4) << 2, Qfmt_31(0.64072886193538F));
/* split even part of tmp_e */
tmp0 = (itmp_e0 + tmp1);
tmp1 = fxp_mul32_by_16((itmp_e0 - tmp1), Qfmt15(0.54119610014620F));
tmp3 = fxp_mul32_by_16((itmp_e1 - itmp_e2) << 1, Qfmt15(0.65328148243819F));
tmp2 = (itmp_e1 + itmp_e2);
vec[ 0] = tmp0 >> 1;
vec[ 0] += tmp2 >> 1;
vec[ 8] = fxp_mul32_by_16((tmp0 - tmp2), Qfmt15(0.70710678118655F));
vec[12] = fxp_mul32_by_16((tmp1 - tmp3) << 1, Qfmt15(0.70710678118655F));
vec[ 4] = tmp1 + tmp3;
vec[ 4] += vec[12];
/* split odd part of tmp_e */
tmp1 = fxp_mul32_by_16((tmp7 - tmp4) << 1, Qfmt15(0.54119610014620F));
tmp7 += tmp4;
tmp3 = fxp_mul32_Q31((tmp6 - tmp5) << 2, Qfmt_31(0.65328148243819F));
tmp6 += tmp5;
vec[10] = fxp_mul32_by_16((tmp7 - tmp6) << 1, Qfmt15(0.70710678118655F));
vec[ 2] = tmp7 + tmp6;
vec[14] = fxp_mul32_by_16((tmp1 - tmp3) << 1, Qfmt15(0.70710678118655F));
tmp1 += tmp3 + vec[14];
vec[ 2] += tmp1;
vec[ 6] = tmp1 + vec[10];
vec[10] += vec[14];
// dct8;
tmp7 = tmp_o0 + tmp_o7;
tmp_o7 = fxp_mul32_by_16((tmp_o0 - tmp_o7) << 1, Qfmt15(0.50979557910416F));
tmp6 = tmp_o1 + tmp_o6;
tmp_o1 = fxp_mul32_by_16((tmp_o1 - tmp_o6) << 1, Qfmt15(0.60134488693505F));
tmp5 = tmp_o2 + tmp_o5;
tmp_o5 = fxp_mul32_by_16((tmp_o2 - tmp_o5) << 1, Qfmt15(0.89997622313642F));
tmp4 = tmp_o3 + tmp_o4;
tmp_o3 = fxp_mul32_Q31((tmp_o3 - tmp_o4) << 3, Qfmt_31(0.6407288619354F));
if (!flag)
{
tmp7 = -tmp7;
tmp_o7 = -tmp_o7;
tmp6 = -tmp6;
tmp_o1 = -tmp_o1;
tmp5 = -tmp5;
tmp_o5 = -tmp_o5;
tmp4 = -tmp4;
tmp_o3 = -tmp_o3;
}
// even part
tmp1 = fxp_mul32_by_16((tmp7 - tmp4) << 1, Qfmt15(0.54119610014620F));
tmp0 = tmp7 + tmp4;
tmp3 = fxp_mul32_Q31((tmp6 - tmp5) << 2, Qfmt_31(0.65328148243819F));
tmp2 = tmp6 + tmp5;
vec[ 9] = fxp_mul32_Q31((tmp0 - tmp2) << 1, Qfmt_31(0.70710678118655F));
vec[ 1] = tmp0 + tmp2;
vec[13] = fxp_mul32_Q31((tmp1 - tmp3) << 1, Qfmt_31(0.70710678118655F));
vec[ 5] = tmp1 + tmp3 + vec[13];
// odd part
tmp0 = tmp_o7 + tmp_o3;
tmp1 = fxp_mul32_by_16((tmp_o7 - tmp_o3) << 1, Qfmt15(0.54119610014620F));
tmp2 = tmp_o1 + tmp_o5;
tmp3 = fxp_mul32_Q31((tmp_o1 - tmp_o5) << 2, Qfmt_31(0.65328148243819F));
vec[11] = fxp_mul32_Q31((tmp0 - tmp2) << 1, Qfmt_31(0.70710678118655F));
vec[ 3] = tmp0 + tmp2;
vec[15] = fxp_mul32_Q31((tmp1 - tmp3) << 1, Qfmt_31(0.70710678118655F));
vec[ 7] = tmp1 + tmp3 + vec[15];
vec[ 3] += vec[ 7];
vec[ 7] += vec[11];
vec[11] += vec[15];
vec[ 1] += vec[ 3];
vec[ 3] += vec[ 5];
vec[ 5] += vec[ 7];
vec[ 7] += vec[ 9];
vec[ 9] += vec[11];
vec[11] += vec[13];
vec[13] += vec[15];
}