📄 intra4x4_pred.c
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mb_pred[jpos3][ipos1] = (imgpel) ((P_E + P_G + 2*(P_F) + 2) >> 2);
mb_pred[jpos2][ipos3] =
mb_pred[jpos3][ipos2] = (imgpel) ((P_F + P_H + 2*(P_G) + 2) >> 2);
mb_pred[jpos3][ipos3] = (imgpel) ((P_G + 3*(P_H) + 2) >> 2);
return DECODING_OK;
}
/*!
***********************************************************************
* \brief
* makes and returns 4x4 vertical right prediction mode
*
* \return
* DECODING_OK decoding of intraprediction mode was sucessfull \n
*
***********************************************************************
*/
static inline int intra4x4_vert_right_pred(ImageParameters *img, //!< image parameters
Macroblock *currMB, //!< current macroblock
ColorPlane pl, //!< current image plane
int ioff, //!< pixel offset X within MB
int joff) //!< pixel offset Y within MB
{
int i;
imgpel PredPel[13]; // array of predictor pels
imgpel **imgY = (pl) ? dec_picture->imgUV[pl - 1] : dec_picture->imgY;
PixelPos pix_a[4];
PixelPos pix_b, pix_d;
int block_available_up;
int block_available_left;
int block_available_up_left;
int jpos0 = joff, jpos1 = joff + 1, jpos2 = joff + 2, jpos3 = joff + 3;
int ipos0 = ioff, ipos1 = ioff + 1, ipos2 = ioff + 2, ipos3 = ioff + 3;
imgpel **mb_pred = img->mb_pred[pl];
for (i=0;i<4;i++)
{
getNeighbour(currMB, ioff -1 , joff +i , img->mb_size[IS_LUMA], &pix_a[i]);
}
getNeighbour(currMB, ioff , joff -1 , img->mb_size[IS_LUMA], &pix_b);
getNeighbour(currMB, ioff -1 , joff -1 , img->mb_size[IS_LUMA], &pix_d);
if (active_pps->constrained_intra_pred_flag)
{
for (i=0, block_available_left=1; i<4;i++)
block_available_left &= pix_a[i].available ? img->intra_block[pix_a[i].mb_addr]: 0;
block_available_up = pix_b.available ? img->intra_block [pix_b.mb_addr] : 0;
block_available_up_left = pix_d.available ? img->intra_block [pix_d.mb_addr] : 0;
}
else
{
block_available_left = pix_a[0].available;
block_available_up = pix_b.available;
block_available_up_left = pix_d.available;
}
if ((!block_available_up)||(!block_available_left)||(!block_available_up_left))
printf ("warning: Intra_4x4_Vertical_Right prediction mode not allowed at mb %d\n", (int) img->current_mb_nr);
// form predictor pels
P_A = imgY[pix_b.pos_y][pix_b.pos_x + 0];
P_B = imgY[pix_b.pos_y][pix_b.pos_x + 1];
P_C = imgY[pix_b.pos_y][pix_b.pos_x + 2];
P_D = imgY[pix_b.pos_y][pix_b.pos_x + 3];
P_I = imgY[pix_a[0].pos_y][pix_a[0].pos_x];
P_J = imgY[pix_a[1].pos_y][pix_a[1].pos_x];
P_K = imgY[pix_a[2].pos_y][pix_a[2].pos_x];
P_L = imgY[pix_a[3].pos_y][pix_a[3].pos_x];
P_X = imgY[pix_d.pos_y][pix_d.pos_x];
mb_pred[jpos0][ipos0] =
mb_pred[jpos2][ipos1] = (imgpel) ((P_X + P_A + 1) >> 1);
mb_pred[jpos0][ipos1] =
mb_pred[jpos2][ipos2] = (imgpel) ((P_A + P_B + 1) >> 1);
mb_pred[jpos0][ipos2] =
mb_pred[jpos2][ipos3] = (imgpel) ((P_B + P_C + 1) >> 1);
mb_pred[jpos0][ipos3] = (imgpel) ((P_C + P_D + 1) >> 1);
mb_pred[jpos1][ipos0] =
mb_pred[jpos3][ipos1] = (imgpel) ((P_I + 2*P_X + P_A + 2) >> 2);
mb_pred[jpos1][ipos1] =
mb_pred[jpos3][ipos2] = (imgpel) ((P_X + 2*P_A + P_B + 2) >> 2);
mb_pred[jpos1][ipos2] =
mb_pred[jpos3][ipos3] = (imgpel) ((P_A + 2*P_B + P_C + 2) >> 2);
mb_pred[jpos1][ipos3] = (imgpel) ((P_B + 2*P_C + P_D + 2) >> 2);
mb_pred[jpos2][ipos0] = (imgpel) ((P_X + 2*P_I + P_J + 2) >> 2);
mb_pred[jpos3][ipos0] = (imgpel) ((P_I + 2*P_J + P_K + 2) >> 2);
return DECODING_OK;
}
/*!
***********************************************************************
* \brief
* makes and returns 4x4 vertical left prediction mode
*
* \return
* DECODING_OK decoding of intraprediction mode was sucessfull \n
*
***********************************************************************
*/
static inline int intra4x4_vert_left_pred(ImageParameters *img, //!< image parameters
Macroblock *currMB, //!< current macroblock
ColorPlane pl, //!< current image plane
int ioff, //!< pixel offset X within MB
int joff) //!< pixel offset Y within MB
{
imgpel PredPel[13]; // array of predictor pels
imgpel **imgY = (pl) ? dec_picture->imgUV[pl - 1] : dec_picture->imgY;
PixelPos pix_b, pix_c;
int block_available_up;
int block_available_up_right;
int jpos0 = joff, jpos1 = joff + 1, jpos2 = joff + 2, jpos3 = joff + 3;
int ipos0 = ioff, ipos1 = ioff + 1, ipos2 = ioff + 2, ipos3 = ioff + 3;
imgpel **mb_pred = img->mb_pred[pl];
getNeighbour(currMB, ioff , joff -1 , img->mb_size[IS_LUMA], &pix_b);
getNeighbour(currMB, ioff +4 , joff -1 , img->mb_size[IS_LUMA], &pix_c);
pix_c.available = pix_c.available && !((ioff==4) && ((joff==4)||(joff==12)));
if (active_pps->constrained_intra_pred_flag)
{
block_available_up = pix_b.available ? img->intra_block [pix_b.mb_addr] : 0;
block_available_up_right = pix_c.available ? img->intra_block [pix_c.mb_addr] : 0;
}
else
{
block_available_up = pix_b.available;
block_available_up_right = pix_c.available;
}
if (!block_available_up)
printf ("warning: Intra_4x4_Vertical_Left prediction mode not allowed at mb %d\n", (int) img->current_mb_nr);
// form predictor pels
P_A = imgY[pix_b.pos_y][pix_b.pos_x + 0];
P_B = imgY[pix_b.pos_y][pix_b.pos_x + 1];
P_C = imgY[pix_b.pos_y][pix_b.pos_x + 2];
P_D = imgY[pix_b.pos_y][pix_b.pos_x + 3];
if (block_available_up_right)
{
P_E = imgY[pix_c.pos_y][pix_c.pos_x + 0];
P_F = imgY[pix_c.pos_y][pix_c.pos_x + 1];
P_G = imgY[pix_c.pos_y][pix_c.pos_x + 2];
P_H = imgY[pix_c.pos_y][pix_c.pos_x + 3];
}
else
{
P_E = P_F = P_G = P_H = P_D;
}
mb_pred[jpos0][ipos0] = (imgpel) ((P_A + P_B + 1) >> 1);
mb_pred[jpos0][ipos1] =
mb_pred[jpos2][ipos0] = (imgpel) ((P_B + P_C + 1) >> 1);
mb_pred[jpos0][ipos2] =
mb_pred[jpos2][ipos1] = (imgpel) ((P_C + P_D + 1) >> 1);
mb_pred[jpos0][ipos3] =
mb_pred[jpos2][ipos2] = (imgpel) ((P_D + P_E + 1) >> 1);
mb_pred[jpos2][ipos3] = (imgpel) ((P_E + P_F + 1) >> 1);
mb_pred[jpos1][ipos0] = (imgpel) ((P_A + 2*P_B + P_C + 2) >> 2);
mb_pred[jpos1][ipos1] =
mb_pred[jpos3][ipos0] = (imgpel) ((P_B + 2*P_C + P_D + 2) >> 2);
mb_pred[jpos1][ipos2] =
mb_pred[jpos3][ipos1] = (imgpel) ((P_C + 2*P_D + P_E + 2) >> 2);
mb_pred[jpos1][ipos3] =
mb_pred[jpos3][ipos2] = (imgpel) ((P_D + 2*P_E + P_F + 2) >> 2);
mb_pred[jpos3][ipos3] = (imgpel) ((P_E + 2*P_F + P_G + 2) >> 2);
return DECODING_OK;
}
/*!
***********************************************************************
* \brief
* makes and returns 4x4 horizontal up prediction mode
*
* \return
* DECODING_OK decoding of intraprediction mode was sucessfull \n
*
***********************************************************************
*/
static inline int intra4x4_hor_up_pred(ImageParameters *img, //!< image parameters
Macroblock *currMB, //!< current macroblock
ColorPlane pl, //!< current image plane
int ioff, //!< pixel offset X within MB
int joff) //!< pixel offset Y within MB
{
int i;
imgpel PredPel[13]; // array of predictor pels
imgpel **imgY = (pl) ? dec_picture->imgUV[pl - 1] : dec_picture->imgY;
PixelPos pix_a[4];
int block_available_left;
int jpos0 = joff, jpos1 = joff + 1, jpos2 = joff + 2, jpos3 = joff + 3;
int ipos0 = ioff, ipos1 = ioff + 1, ipos2 = ioff + 2, ipos3 = ioff + 3;
imgpel **mb_pred = img->mb_pred[pl];
for (i=0;i<4;i++)
{
getNeighbour(currMB, ioff -1 , joff +i , img->mb_size[IS_LUMA], &pix_a[i]);
}
if (active_pps->constrained_intra_pred_flag)
{
for (i=0, block_available_left=1; i<4;i++)
block_available_left &= pix_a[i].available ? img->intra_block[pix_a[i].mb_addr]: 0;
}
else
{
block_available_left = pix_a[0].available;
}
if (!block_available_left)
printf ("warning: Intra_4x4_Horizontal_Up prediction mode not allowed at mb %d\n",(int) img->current_mb_nr);
// form predictor pels
P_I = imgY[pix_a[0].pos_y][pix_a[0].pos_x];
P_J = imgY[pix_a[1].pos_y][pix_a[1].pos_x];
P_K = imgY[pix_a[2].pos_y][pix_a[2].pos_x];
P_L = imgY[pix_a[3].pos_y][pix_a[3].pos_x];
mb_pred[jpos0][ipos0] = (imgpel) ((P_I + P_J + 1) >> 1);
mb_pred[jpos0][ipos1] = (imgpel) ((P_I + 2*P_J + P_K + 2) >> 2);
mb_pred[jpos0][ipos2] =
mb_pred[jpos1][ipos0] = (imgpel) ((P_J + P_K + 1) >> 1);
mb_pred[jpos0][ipos3] =
mb_pred[jpos1][ipos1] = (imgpel) ((P_J + 2*P_K + P_L + 2) >> 2);
mb_pred[jpos1][ipos2] =
mb_pred[jpos2][ipos0] = (imgpel) ((P_K + P_L + 1) >> 1);
mb_pred[jpos1][ipos3] =
mb_pred[jpos2][ipos1] = (imgpel) ((P_K + 2*P_L + P_L + 2) >> 2);
mb_pred[jpos2][ipos3] =
mb_pred[jpos3][ipos1] =
mb_pred[jpos3][ipos0] =
mb_pred[jpos2][ipos2] =
mb_pred[jpos3][ipos2] =
mb_pred[jpos3][ipos3] = (imgpel) P_L;
return DECODING_OK;
}
/*!
***********************************************************************
* \brief
* makes and returns 4x4 horizontal down prediction mode
*
* \return
* DECODING_OK decoding of intraprediction mode was sucessfull \n
*
***********************************************************************
*/
static inline int intra4x4_hor_down_pred(ImageParameters *img, //!< image parameters
Macroblock *currMB, //!< current macroblock
ColorPlane pl, //!< current image plane
int ioff, //!< pixel offset X within MB
int joff) //!< pixel offset Y within MB
{
int i;
imgpel PredPel[13]; // array of predictor pels
imgpel **imgY = (pl) ? dec_picture->imgUV[pl - 1] : dec_picture->imgY;
PixelPos pix_a[4];
PixelPos pix_b, pix_d;
int block_available_up;
int block_available_left;
int block_available_up_left;
int jpos0 = joff, jpos1 = joff + 1, jpos2 = joff + 2, jpos3 = joff + 3;
int ipos0 = ioff, ipos1 = ioff + 1, ipos2 = ioff + 2, ipos3 = ioff + 3;
imgpel **mb_pred = img->mb_pred[pl];
for (i=0;i<4;i++)
{
getNeighbour(currMB, ioff -1 , joff +i , img->mb_size[IS_LUMA], &pix_a[i]);
}
getNeighbour(currMB, ioff , joff -1 , img->mb_size[IS_LUMA], &pix_b);
getNeighbour(currMB, ioff -1 , joff -1 , img->mb_size[IS_LUMA], &pix_d);
if (active_pps->constrained_intra_pred_flag)
{
for (i=0, block_available_left=1; i<4;i++)
block_available_left &= pix_a[i].available ? img->intra_block[pix_a[i].mb_addr]: 0;
block_available_up = pix_b.available ? img->intra_block [pix_b.mb_addr] : 0;
block_available_up_left = pix_d.available ? img->intra_block [pix_d.mb_addr] : 0;
}
else
{
block_available_left = pix_a[0].available;
block_available_up = pix_b.available;
block_available_up_left = pix_d.available;
}
if ((!block_available_up)||(!block_available_left)||(!block_available_up_left))
printf ("warning: Intra_4x4_Horizontal_Down prediction mode not allowed at mb %d\n", (int) img->current_mb_nr);
// form predictor pels
P_A = imgY[pix_b.pos_y][pix_b.pos_x + 0];
P_B = imgY[pix_b.pos_y][pix_b.pos_x + 1];
P_C = imgY[pix_b.pos_y][pix_b.pos_x + 2];
P_D = imgY[pix_b.pos_y][pix_b.pos_x + 3];
P_I = imgY[pix_a[0].pos_y][pix_a[0].pos_x];
P_J = imgY[pix_a[1].pos_y][pix_a[1].pos_x];
P_K = imgY[pix_a[2].pos_y][pix_a[2].pos_x];
P_L = imgY[pix_a[3].pos_y][pix_a[3].pos_x];
P_X = imgY[pix_d.pos_y][pix_d.pos_x];
mb_pred[jpos0][ipos0] =
mb_pred[jpos1][ipos2] = (imgpel) ((P_X + P_I + 1) >> 1);
mb_pred[jpos0][ipos1] =
mb_pred[jpos1][ipos3] = (imgpel) ((P_I + 2*P_X + P_A + 2) >> 2);
mb_pred[jpos0][ipos2] = (imgpel) ((P_X + 2*P_A + P_B + 2) >> 2);
mb_pred[jpos0][ipos3] = (imgpel) ((P_A + 2*P_B + P_C + 2) >> 2);
mb_pred[jpos1][ipos0] =
mb_pred[jpos2][ipos2] = (imgpel) ((P_I + P_J + 1) >> 1);
mb_pred[jpos1][ipos1] =
mb_pred[jpos2][ipos3] = (imgpel) ((P_X + 2*P_I + P_J + 2) >> 2);
mb_pred[jpos2][ipos0] =
mb_pred[jpos3][ipos2] = (imgpel) ((P_J + P_K + 1) >> 1);
mb_pred[jpos2][ipos1] =
mb_pred[jpos3][ipos3] = (imgpel) ((P_I + 2*P_J + P_K + 2) >> 2);
mb_pred[jpos3][ipos0] = (imgpel) ((P_K + P_L + 1) >> 1);
mb_pred[jpos3][ipos1] = (imgpel) ((P_J + 2*P_K + P_L + 2) >> 2);
return DECODING_OK;
}
/*!
***********************************************************************
* \brief
* makes and returns 4x4 intra prediction blocks
*
* \return
* DECODING_OK decoding of intraprediction mode was sucessfull \n
* SEARCH_SYNC search next sync element as errors while decoding occured
***********************************************************************
*/
int intrapred(ImageParameters *img, //!< image parameters
Macroblock *currMB, //!< current macroblock
ColorPlane pl, //!< current image plane
int ioff, //!< pixel offset X within MB
int joff, //!< pixel offset Y within MB
int img_block_x, //!< location of block X, multiples of 4
int img_block_y) //!< location of block Y, multiples of 4
{
byte predmode = img->ipredmode[img_block_y][img_block_x];
ipmode_DPCM = predmode; //For residual DPCM
switch (predmode)
{
case DC_PRED:
return (intra4x4_dc_pred(img, currMB, pl, ioff, joff));
break;
case VERT_PRED:
return (intra4x4_vert_pred(img, currMB, pl, ioff, joff));
break;
case HOR_PRED:
return (intra4x4_hor_pred(img, currMB, pl, ioff, joff));
break;
case DIAG_DOWN_RIGHT_PRED:
return (intra4x4_diag_down_right_pred(img, currMB, pl, ioff, joff));
break;
case DIAG_DOWN_LEFT_PRED:
return (intra4x4_diag_down_left_pred(img, currMB, pl, ioff, joff));
break;
case VERT_RIGHT_PRED:
return (intra4x4_vert_right_pred(img, currMB, pl, ioff, joff));
break;
case VERT_LEFT_PRED:
return (intra4x4_vert_left_pred(img, currMB, pl, ioff, joff));
break;
case HOR_UP_PRED:
return (intra4x4_hor_up_pred(img, currMB, pl, ioff, joff));
break;
case HOR_DOWN_PRED:
return (intra4x4_hor_down_pred(img, currMB, pl, ioff, joff));
default:
printf("Error: illegal intra_4x4 prediction mode: %d\n", (int) predmode);
return SEARCH_SYNC;
break;
}
return DECODING_OK;
}
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