c语言示例aan算法

static void IDCTaan_c(short* block)
{
 int x0,x1,x2,x3,x4,x5,x6,x7;
 int t0,t1;
 short *blk;
// Field one
 blk  =  block;
 for(int i=0; i<8; i++)
 {
  if (!(  (x1 = blk[1]) 
           | (x2 = blk[2])
           | (x3 = blk[3])
           | (x4 = blk[4])
           | (x5 = blk[5])
           | (x6 = blk[6])
           | (x7 = blk[7])))
  {
     // blk[0]=
       blk[1]=blk[2]=blk[3]=blk[4]
           =blk[5]=blk[6]=blk[7]=(blk[0]);
  }
        else
  {

   idct_unit(blk[0],blk[4])

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