示例#1
0
/*The function used to fill in the chroma plane motion vectors for a macro
   block when 4 different motion vectors are specified in the luma plane.
  This version is for use with chroma decimated in the X and Y directions.
  _cbmvs: The chroma block-level motion vectors to fill in.
  _lbmvs: The luma block-level motion vectors.*/
static void oc_set_chroma_mvs00(oc_mv _cbmvs[4],const oc_mv _lbmvs[4]){
  int dx;
  int dy;
  dx=_lbmvs[0][0]+_lbmvs[1][0]+_lbmvs[2][0]+_lbmvs[3][0];
  dy=_lbmvs[0][1]+_lbmvs[1][1]+_lbmvs[2][1]+_lbmvs[3][1];
  _cbmvs[0][0]=(signed char)OC_DIV_ROUND_POW2(dx,2,2);
  _cbmvs[0][1]=(signed char)OC_DIV_ROUND_POW2(dy,2,2);
}
示例#2
0
/*The function used to fill in the chroma plane motion vectors for a macro
   block when 4 different motion vectors are specified in the luma plane.
  This version is for use with chroma decimated in the X and Y directions
   (4:2:0).
  _cbmvs: The chroma block-level motion vectors to fill in.
  _lbmvs: The luma block-level motion vectors.*/
static void oc_set_chroma_mvs00(oc_mv _cbmvs[4],const oc_mv _lbmvs[4]){
  int dx;
  int dy;
  dx=OC_MV_X(_lbmvs[0])+OC_MV_X(_lbmvs[1])
   +OC_MV_X(_lbmvs[2])+OC_MV_X(_lbmvs[3]);
  dy=OC_MV_Y(_lbmvs[0])+OC_MV_Y(_lbmvs[1])
   +OC_MV_Y(_lbmvs[2])+OC_MV_Y(_lbmvs[3]);
  _cbmvs[0]=OC_MV(OC_DIV_ROUND_POW2(dx,2,2),OC_DIV_ROUND_POW2(dy,2,2));
}
示例#3
0
文件: fdct.c 项目: kazutomi/xiphqt
/*Pads a single row of a partial block and then performs a forward Type-II DCT
   on the result.
  The output is scaled by a factor of 2 from the orthonormal version of the
   transform.
  _y: The buffer to store the result in.
      Data will be placed in every 8th entry (e.g., in a column of an 8x8
       block).
  _x: The input coefficients.
      The first 8 entries are used (e.g., from a row of an 8x8 block).
  _e: The extension information for the shape.*/
static void fdct8_ext(ogg_int16_t *_y,ogg_int16_t _x[8],
 const oc_extension_info *_e){
  if(_e->na==1){
    int ci;
    /*While the branch below is still correct for shapes with na==1, we can
       perform the entire transform with just 1 multiply in this case instead
       of 23.*/
    _y[0]=(ogg_int16_t)(OC_DIV2_16(OC_C4S4*(_x[_e->pi[0]]<<3)));
    for(ci=8;ci<64;ci+=8)_y[ci]=0;
  }
  else{
    int zpi;
    int api;
    int nz;
    /*First multiply by the extension matrix to compute the padding values.*/
    nz=8-_e->na;
    for(zpi=0;zpi<nz;zpi++){
      ogg_int32_t v;
      v=0;
      for(api=0;api<_e->na;api++)v+=_e->ext[zpi][api]*_x[_e->pi[api]];
      _x[_e->pi[zpi+_e->na]]=
       (ogg_int16_t)OC_DIV_ROUND_POW2(v,OC_EXT_SHIFT,1<<OC_EXT_SHIFT-1);
    }
    fdct8(_y,_x);
  }
}