Function rv34_row_transform

libavcodec/rv34.c:178–193

 */

static av_always_inline void rv34_row_transform(int temp[16], DCTELEM *block)
{
    int i;

    for(i=0; i<4; i++){
        const int z0= 13*(block[i+8*0] +    block[i+8*2]);
        const int z1= 13*(block[i+8*0] -    block[i+8*2]);
        const int z2=  7* block[i+8*1] - 17*block[i+8*3];
        const int z3= 17* block[i+8*1] +  7*block[i+8*3];

        temp[4*i+0]= z0+z3;
        temp[4*i+1]= z1+z2;
        temp[4*i+2]= z1-z2;
        temp[4*i+3]= z0-z3;
    }
}

/**
 * Real Video 3.0/4.0 inverse transform