www.pudn.com > jm50g.zip > block.c
/*
***********************************************************************
* COPYRIGHT AND WARRANTY INFORMATION
*
* Copyright 2001, International Telecommunications Union, Geneva
*
* DISCLAIMER OF WARRANTY
*
* These software programs are available to the user without any
* license fee or royalty on an "as is" basis. The ITU disclaims
* any and all warranties, whether express, implied, or
* statutory, including any implied warranties of merchantability
* or of fitness for a particular purpose. In no event shall the
* contributor or the ITU be liable for any incidental, punitive, or
* consequential damages of any kind whatsoever arising from the
* use of these programs.
*
* This disclaimer of warranty extends to the user of these programs
* and user's customers, employees, agents, transferees, successors,
* and assigns.
*
* The ITU does not represent or warrant that the programs furnished
* hereunder are free of infringement of any third-party patents.
* Commercial implementations of ITU-T Recommendations, including
* shareware, may be subject to royalty fees to patent holders.
* Information regarding the ITU-T patent policy is available from
* the ITU Web site at http://www.itu.int.
*
* THIS IS NOT A GRANT OF PATENT RIGHTS - SEE THE ITU-T PATENT POLICY.
************************************************************************
*/
/*!
***********************************************************************
* \file
* block.c
*
* \brief
* Block functions
*
* \author
* Main contributors (see contributors.h for copyright, address and affiliation details)
* - Inge Lille-Langøy
* - Rickard Sjoberg
***********************************************************************
*/
#include "contributors.h"
#include
#include
#include "block.h"
#define Q_BITS 15
static const int quant_coef[6][4][4] = {
{{13107, 8066,13107, 8066},{ 8066, 5243, 8066, 5243},{13107, 8066,13107, 8066},{ 8066, 5243, 8066, 5243}},
{{11916, 7490,11916, 7490},{ 7490, 4660, 7490, 4660},{11916, 7490,11916, 7490},{ 7490, 4660, 7490, 4660}},
{{10082, 6554,10082, 6554},{ 6554, 4194, 6554, 4194},{10082, 6554,10082, 6554},{ 6554, 4194, 6554, 4194}},
{{ 9362, 5825, 9362, 5825},{ 5825, 3647, 5825, 3647},{ 9362, 5825, 9362, 5825},{ 5825, 3647, 5825, 3647}},
{{ 8192, 5243, 8192, 5243},{ 5243, 3355, 5243, 3355},{ 8192, 5243, 8192, 5243},{ 5243, 3355, 5243, 3355}},
{{ 7282, 4559, 7282, 4559},{ 4559, 2893, 4559, 2893},{ 7282, 4559, 7282, 4559},{ 4559, 2893, 4559, 2893}}
};
static const int A[4][4] = {
{ 16, 20, 16, 20},
{ 20, 25, 20, 25},
{ 16, 20, 16, 20},
{ 20, 25, 20, 25}
};
// Notation for comments regarding prediction and predictors.
// The pels of the 4x4 block are labelled a..p. The predictor pels above
// are labelled A..H, from the left I..L, and from above left X, as follows:
//
// X A B C D E F G H
// I a b c d
// J e f g h
// K i j k l
// L m n o p
//
// Predictor array index definitions
#define P_X (PredPel[0])
#define P_A (PredPel[1])
#define P_B (PredPel[2])
#define P_C (PredPel[3])
#define P_D (PredPel[4])
#define P_E (PredPel[5])
#define P_F (PredPel[6])
#define P_G (PredPel[7])
#define P_H (PredPel[8])
#define P_I (PredPel[9])
#define P_J (PredPel[10])
#define P_K (PredPel[11])
#define P_L (PredPel[12])
/*!
***********************************************************************
* \brief
* makes and returns 4x4 blocks with all 5 intra prediction modes
*
* \return
* DECODING_OK decoding of intraprediction mode was sucessfull \n
* SEARCH_SYNC search next sync element as errors while decoding occured
***********************************************************************
*/
int intrapred(
struct img_par *img, //!< image parameters
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
{
int i,j;
int s0;
int img_y,img_x;
int PredPel[13]; // array of predictor pels
int block_available_up;
int block_available_up_right;
int block_available_left;
byte predmode = img->ipredmode[img_block_x+1][img_block_y+1];
img_x=img_block_x*4;
img_y=img_block_y*4;
if (img->mb_field)
{
if (img->current_mb_nr%2)
{
predmode = img->ipredmode_bot[img_block_x+1][img_block_y+1];
block_available_up = (img->ipredmode_bot[img_block_x+1][img_block_y] >=0);
block_available_up_right = (img->ipredmode_bot[img_x/BLOCK_SIZE+2][img_y/BLOCK_SIZE] >=0); // ???
block_available_left = (img->ipredmode_bot[img_block_x][img_block_y+1] >=0);
}
else
{
predmode = img->ipredmode_top[img_block_x+1][img_block_y+1];
block_available_up = (img->ipredmode_top[img_block_x+1][img_block_y] >=0);
block_available_up_right = (img->ipredmode_top[img_x/BLOCK_SIZE+2][img_y/BLOCK_SIZE] >=0); // ???
block_available_left = (img->ipredmode_top[img_block_x][img_block_y+1] >=0);
}
}
else
{
block_available_up = (img->ipredmode[img_block_x+1][img_block_y] >=0); /// can use frm
block_available_up_right = (img->ipredmode[img_x/BLOCK_SIZE+2][img_y/BLOCK_SIZE] >=0); // ??? /// can use frm
block_available_left = (img->ipredmode[img_block_x][img_block_y+1] >=0); /// can use frm
}
if(img_x%MB_BLOCK_SIZE == 12 && img->mb_frame_field_flag)
block_available_up_right = 0;
i = (img_x & 15);
j = (img_y & 15);
if (block_available_up_right)
{
if ((i == 4 && j == 4) ||
(i == 12 && j == 4) ||
(i == 12 && j == 8) ||
(i == 4 && j == 12) ||
(i == 12 && j == 12))
{
block_available_up_right = 0;
}
}
// form predictor pels
if (block_available_up)
{
P_A = imgY[img_y-1][img_x+0];
P_B = imgY[img_y-1][img_x+1];
P_C = imgY[img_y-1][img_x+2];
P_D = imgY[img_y-1][img_x+3];
if (block_available_up_right)
{
P_E = imgY[img_y-1][img_x+4];
P_F = imgY[img_y-1][img_x+5];
P_G = imgY[img_y-1][img_x+6];
P_H = imgY[img_y-1][img_x+7];
}
else
{
P_E = P_F = P_G = P_H = P_D;
}
}
else
{
P_A = P_B = P_C = P_D = P_E = P_F = P_G = P_H = 128;
}
if (block_available_left)
{
P_I = imgY[img_y+0][img_x-1];
P_J = imgY[img_y+1][img_x-1];
P_K = imgY[img_y+2][img_x-1];
P_L = imgY[img_y+3][img_x-1];
}
else
{
P_I = P_J = P_K = P_L = 128;
}
if (block_available_up && block_available_left)
{
P_X = imgY[img_y-1][img_x-1];
}
else
{
P_X = 128;
}
switch (predmode)
{
case DC_PRED: /* DC prediction */
s0 = 0;
if (block_available_up && block_available_left)
{
// no edge
s0 = (P_A + P_B + P_C + P_D + P_I + P_J + P_K + P_L + 4)/(2*BLOCK_SIZE);
}
else if (!block_available_up && block_available_left)
{
// upper edge
s0 = (P_I + P_J + P_K + P_L + 2)/BLOCK_SIZE;
}
else if (block_available_up && !block_available_left)
{
// left edge
s0 = (P_A + P_B + P_C + P_D + 2)/BLOCK_SIZE;
}
else //if (!block_available_up && !block_available_left)
{
// top left corner, nothing to predict from
s0 = 128;
}
for (j=0; j < BLOCK_SIZE; j++)
{
for (i=0; i < BLOCK_SIZE; i++)
{
// store DC prediction
img->mpr[i+ioff][j+joff] = s0;
}
}
break;
case VERT_PRED: /* vertical prediction from block above */
for(j=0;jmpr[i+ioff][j+joff]=imgY[img_y-1][img_x+i];/* store predicted 4x4 block */
break;
case HOR_PRED: /* horisontal prediction from left block */
for(j=0;jmpr[i+ioff][j+joff]=imgY[img_y+j][img_x-1]; /* store predicted 4x4 block */
break;
case DIAG_DOWN_RIGHT_PRED:
img->mpr[0+ioff][3+joff] = (P_L + 2*P_K + P_J + 2) / 4;
img->mpr[0+ioff][2+joff] =
img->mpr[1+ioff][3+joff] = (P_K + 2*P_J + P_I + 2) / 4;
img->mpr[0+ioff][1+joff] =
img->mpr[1+ioff][2+joff] =
img->mpr[2+ioff][3+joff] = (P_J + 2*P_I + P_X + 2) / 4;
img->mpr[0+ioff][0+joff] =
img->mpr[1+ioff][1+joff] =
img->mpr[2+ioff][2+joff] =
img->mpr[3+ioff][3+joff] = (P_I + 2*P_X + P_A + 2) / 4;
img->mpr[1+ioff][0+joff] =
img->mpr[2+ioff][1+joff] =
img->mpr[3+ioff][2+joff] = (P_X + 2*P_A + P_B + 2) / 4;
img->mpr[2+ioff][0+joff] =
img->mpr[3+ioff][1+joff] = (P_A + 2*P_B + P_C + 2) / 4;
img->mpr[3+ioff][0+joff] = (P_B + 2*P_C + P_D + 2) / 4;
break;
case DIAG_DOWN_LEFT_PRED:
img->mpr[0+ioff][0+joff] = (P_A + P_C + 2*(P_B) + 2) / 4;
img->mpr[1+ioff][0+joff] =
img->mpr[0+ioff][1+joff] = (P_B + P_D + 2*(P_C) + 2) / 4;
img->mpr[2+ioff][0+joff] =
img->mpr[1+ioff][1+joff] =
img->mpr[0+ioff][2+joff] = (P_C + P_E + 2*(P_D) + 2) / 4;
img->mpr[3+ioff][0+joff] =
img->mpr[2+ioff][1+joff] =
img->mpr[1+ioff][2+joff] =
img->mpr[0+ioff][3+joff] = (P_D + P_F + 2*(P_E) + 2) / 4;
img->mpr[3+ioff][1+joff] =
img->mpr[2+ioff][2+joff] =
img->mpr[1+ioff][3+joff] = (P_E + P_G + 2*(P_F) + 2) / 4;
img->mpr[3+ioff][2+joff] =
img->mpr[2+ioff][3+joff] = (P_F + P_H + 2*(P_G) + 2) / 4;
img->mpr[3+ioff][3+joff] = (P_G + 3*(P_H) + 2) / 4;
break;
case VERT_RIGHT_PRED:/* diagonal prediction -22.5 deg to horizontal plane */
img->mpr[0+ioff][0+joff] =
img->mpr[1+ioff][2+joff] = (P_X + P_A + 1) / 2;
img->mpr[1+ioff][0+joff] =
img->mpr[2+ioff][2+joff] = (P_A + P_B + 1) / 2;
img->mpr[2+ioff][0+joff] =
img->mpr[3+ioff][2+joff] = (P_B + P_C + 1) / 2;
img->mpr[3+ioff][0+joff] = (P_C + P_D + 1) / 2;
img->mpr[0+ioff][1+joff] =
img->mpr[1+ioff][3+joff] = (P_I + 2*P_X + P_A + 2) / 4;
img->mpr[1+ioff][1+joff] =
img->mpr[2+ioff][3+joff] = (P_X + 2*P_A + P_B + 2) / 4;
img->mpr[2+ioff][1+joff] =
img->mpr[3+ioff][3+joff] = (P_A + 2*P_B + P_C + 2) / 4;
img->mpr[3+ioff][1+joff] = (P_B + 2*P_C + P_D + 2) / 4;
img->mpr[0+ioff][2+joff] = (P_X + 2*P_I + P_J + 2) / 4;
img->mpr[0+ioff][3+joff] = (P_I + 2*P_J + P_K + 2) / 4;
break;
case VERT_LEFT_PRED:/* diagonal prediction -22.5 deg to horizontal plane */
img->mpr[0+ioff][0+joff] = (P_A + P_B + 1) / 2;
img->mpr[1+ioff][0+joff] =
img->mpr[0+ioff][2+joff] = (P_B + P_C + 1) / 2;
img->mpr[2+ioff][0+joff] =
img->mpr[1+ioff][2+joff] = (P_C + P_D + 1) / 2;
img->mpr[3+ioff][0+joff] =
img->mpr[2+ioff][2+joff] = (P_D + P_E + 1) / 2;
img->mpr[3+ioff][2+joff] = (P_E + P_F + 1) / 2;
img->mpr[0+ioff][1+joff] = (P_A + 2*P_B + P_C + 2) / 4;
img->mpr[1+ioff][1+joff] =
img->mpr[0+ioff][3+joff] = (P_B + 2*P_C + P_D + 2) / 4;
img->mpr[2+ioff][1+joff] =
img->mpr[1+ioff][3+joff] = (P_C + 2*P_D + P_E + 2) / 4;
img->mpr[3+ioff][1+joff] =
img->mpr[2+ioff][3+joff] = (P_D + 2*P_E + P_F + 2) / 4;
img->mpr[3+ioff][3+joff] = (P_E + 2*P_F + P_G + 2) / 4;
break;
case HOR_UP_PRED:/* diagonal prediction -22.5 deg to horizontal plane */
img->mpr[0+ioff][0+joff] = (P_I + P_J + 1) / 2;
img->mpr[1+ioff][0+joff] = (P_I + 2*P_J + P_K + 2) / 4;
img->mpr[2+ioff][0+joff] =
img->mpr[0+ioff][1+joff] = (P_J + P_K + 1) / 2;
img->mpr[3+ioff][0+joff] =
img->mpr[1+ioff][1+joff] = (P_J + 2*P_K + P_L + 2) / 4;
img->mpr[2+ioff][1+joff] =
img->mpr[0+ioff][2+joff] = (P_K + P_L + 1) / 2;
img->mpr[3+ioff][1+joff] =
img->mpr[1+ioff][2+joff] = (P_K + 2*P_L + P_L + 2) / 4;
img->mpr[3+ioff][2+joff] =
img->mpr[1+ioff][3+joff] =
img->mpr[0+ioff][3+joff] =
img->mpr[2+ioff][2+joff] =
img->mpr[2+ioff][3+joff] =
img->mpr[3+ioff][3+joff] = P_L;
break;
case HOR_DOWN_PRED:/* diagonal prediction -22.5 deg to horizontal plane */
img->mpr[0+ioff][0+joff] =
img->mpr[2+ioff][1+joff] = (P_X + P_I + 1) / 2;
img->mpr[1+ioff][0+joff] =
img->mpr[3+ioff][1+joff] = (P_I + 2*P_X + P_A + 2) / 4;
img->mpr[2+ioff][0+joff] = (P_X + 2*P_A + P_B + 2) / 4;
img->mpr[3+ioff][0+joff] = (P_A + 2*P_B + P_C + 2) / 4;
img->mpr[0+ioff][1+joff] =
img->mpr[2+ioff][2+joff] = (P_I + P_J + 1) / 2;
img->mpr[1+ioff][1+joff] =
img->mpr[3+ioff][2+joff] = (P_X + 2*P_I + P_J + 2) / 4;
img->mpr[0+ioff][2+joff] =
img->mpr[2+ioff][3+joff] = (P_J + P_K + 1) / 2;
img->mpr[1+ioff][2+joff] =
img->mpr[3+ioff][3+joff] = (P_I + 2*P_J + P_K + 2) / 4;
img->mpr[0+ioff][3+joff] = (P_K + P_L + 1) / 2;
img->mpr[1+ioff][3+joff] = (P_J + 2*P_K + P_L + 2) / 4;
break;
default:
printf("Error: illegal prediction mode input: %d\n",predmode);
return SEARCH_SYNC;
break;
}
return DECODING_OK;
}
/*!
***********************************************************************
* \return
* best SAD
***********************************************************************
*/
int intrapred_luma_16x16(struct img_par *img, //!< image parameters
int predmode) //!< prediction mode
{
int s0=0,s1,s2;
int i,j;
int ih,iv;
int ib,ic,iaa;
int mb_width = img->width/16;
//int mb_nr_frame = img->mb_y*mb_width+img->mb_x;
int mb_nr = img->map_mb_nr;// GB img->current_mb_nr;
int mb_available_up = (img->mb_y == 0) ? 0 : (img->mb_data[mb_nr].slice_nr == img->mb_data[mb_nr-mb_width].slice_nr);
int mb_available_left = (img->mb_x == 0) ? 0 : (img->mb_data[mb_nr].slice_nr == img->mb_data[mb_nr-1].slice_nr);
int field_y = img->pix_y; // For MB level frame/field coding
if (img->mb_field)
{
field_y /= 2;
mb_available_up = (img->mb_y/2 == 0) ? 0 : 1;
if (img->current_mb_nr%2) // bottom field
{
field_y -= BLOCK_SIZE*2;
mb_available_up = ((img->mb_y-1)/2 == 0) ? 0 : 1;
}
}
if(img->UseConstrainedIntraPred)
{
if (mb_available_up && (img->intra_block[mb_nr-mb_width][2]==0 || img->intra_block[mb_nr-mb_width][3]==0))
mb_available_up = 0;
if (mb_available_left && (img->intra_block[mb_nr- 1][1]==0 || img->intra_block[mb_nr -1][3]==0))
mb_available_left = 0;
}
s1=s2=0;
switch (predmode)
{
case VERT_PRED_16: // vertical prediction from block above
for(j=0;jmpr[i][j]=imgY[field_y-1][img->pix_x+i];// store predicted 16x16 block
break;
case HOR_PRED_16: // horisontal prediction from left block
for(j=0;jmpr[i][j]=imgY[field_y+j][img->pix_x-1]; // store predicted 16x16 block
break;
case DC_PRED_16: // DC prediction
s1=s2=0;
for (i=0; i < MB_BLOCK_SIZE; i++)
{
if (mb_available_up)
s1 += imgY[field_y-1][img->pix_x+i]; // sum hor pix
if (mb_available_left)
s2 += imgY[field_y+i][img->pix_x-1]; // sum vert pix
}
if (mb_available_up && mb_available_left)
s0=(s1+s2+16)/(2*MB_BLOCK_SIZE); // no edge
if (!mb_available_up && mb_available_left)
s0=(s2+8)/MB_BLOCK_SIZE; // upper edge
if (mb_available_up && !mb_available_left)
s0=(s1+8)/MB_BLOCK_SIZE; // left edge
if (!mb_available_up && !mb_available_left)
s0=128; // top left corner, nothing to predict from
for(i=0;impr[i][j]=s0;
}
break;
case PLANE_16:// 16 bit integer plan pred
ih=0;
iv=0;
for (i=1;i<9;i++)
{
ih += i*(imgY[field_y-1][img->pix_x+7+i] - imgY[field_y-1][img->pix_x+7-i]);
iv += i*(imgY[field_y+7+i][img->pix_x-1] - imgY[field_y+7-i][img->pix_x-1]);
}
ib=(5*ih+32)>>6;
ic=(5*iv+32)>>6;
iaa=16*(imgY[field_y-1][img->pix_x+15]+imgY[field_y+15][img->pix_x-1]);
for (j=0;j< MB_BLOCK_SIZE;j++)
{
for (i=0;i< MB_BLOCK_SIZE;i++)
{
img->mpr[i][j]=max(0,min((iaa+(i-7)*ib +(j-7)*ic + 16)/32,255));
}
}// store plane prediction
break;
default:
{ // indication of fault in bitstream,exit
printf("Error: illegal prediction mode input: %d\n",predmode);
return SEARCH_SYNC;
}
}
return DECODING_OK;
}
/*!
***********************************************************************
* \brief
* Inverse 4x4 transformation, transforms cof to m7
***********************************************************************
*/
void itrans(struct img_par *img, //!< image parameters
int ioff, //!< index to 4x4 block
int joff, //!<
int i0, //!<
int j0) //!<
{
int i,j,i1,j1;
int m5[4];
int m6[4];
// horizontal
for (j=0;jcof[i0][j0][i][j];
}
m6[0]=(m5[0]+m5[2]);
m6[1]=(m5[0]-m5[2]);
m6[2]=(m5[1]>>1)-m5[3];
m6[3]=m5[1]+(m5[3]>>1);
for (i=0;i<2;i++)
{
i1=3-i;
img->m7[i][j]=m6[i]+m6[i1];
img->m7[i1][j]=m6[i]-m6[i1];
}
}
// vertical
for (i=0;im7[i][j];
m6[0]=(m5[0]+m5[2]);
m6[1]=(m5[0]-m5[2]);
m6[2]=(m5[1]>>1)-m5[3];
m6[3]=m5[1]+(m5[3]>>1);
for (j=0;j<2;j++)
{
j1=3-j;
img->m7[i][j] =mmax(0,mmin(255,(m6[j]+m6[j1]+(img->mpr[i+ioff][j+joff] <>DQ_BITS));
img->m7[i][j1]=mmax(0,mmin(255,(m6[j]-m6[j1]+(img->mpr[i+ioff][j1+joff]<>DQ_BITS));
}
}
}
/*!
***********************************************************************
* \brief
* invers transform
***********************************************************************
*/
void itrans_2(
struct img_par *img) //!< image parameters
{
int i,j,i1,j1;
int M5[4];
int M6[4];
int qp_per = (img->qp-MIN_QP)/6;
int qp_rem = (img->qp-MIN_QP)%6;
// horizontal
for (j=0;j<4;j++)
{
for (i=0;i<4;i++)
M5[i]=img->cof[i][j][0][0];
M6[0]=M5[0]+M5[2];
M6[1]=M5[0]-M5[2];
M6[2]=M5[1]-M5[3];
M6[3]=M5[1]+M5[3];
for (i=0;i<2;i++)
{
i1=3-i;
img->cof[i ][j][0][0]= M6[i]+M6[i1];
img->cof[i1][j][0][0]=M6[i]-M6[i1];
}
}
// vertical
for (i=0;i<4;i++)
{
for (j=0;j<4;j++)
M5[j]=img->cof[i][j][0][0];
M6[0]=M5[0]+M5[2];
M6[1]=M5[0]-M5[2];
M6[2]=M5[1]-M5[3];
M6[3]=M5[1]+M5[3];
for (j=0;j<2;j++)
{
j1=3-j;
img->cof[i][j][0][0] = (((M6[j]+M6[j1])*dequant_coef[qp_rem][0][0]<>2;
img->cof[i][j1][0][0]= (((M6[j]-M6[j1])*dequant_coef[qp_rem][0][0]<>2;
}
}
}
void itrans_sp(struct img_par *img, //!< image parameters
int ioff, //!< index to 4x4 block
int joff, //!<
int i0, //!<
int j0) //!<
{
int i,j,i1,j1;
int m5[4];
int m6[4];
int predicted_block[BLOCK_SIZE][BLOCK_SIZE],ilev;
int qp_per = (img->qp-MIN_QP)/6;
int qp_rem = (img->qp-MIN_QP)%6;
int q_bits = Q_BITS+qp_per;
int qp_per_sp = (img->qpsp-MIN_QP)/6;
int qp_rem_sp = (img->qpsp-MIN_QP)%6;
int q_bits_sp = Q_BITS+qp_per_sp;
int qp_const2=(1<sp_switch || img->type == SI_IMG)
{
qp_per = (img->qpsp-MIN_QP)/6;
qp_rem = (img->qpsp-MIN_QP)%6;
q_bits = Q_BITS+qp_per;
}
for (j=0; j< BLOCK_SIZE; j++)
for (i=0; i< BLOCK_SIZE; i++)
predicted_block[i][j]=img->mpr[i+ioff][j+joff];
for (j=0; j < BLOCK_SIZE; j++)
{
for (i=0; i < 2; i++)
{
i1=3-i;
m5[i]=predicted_block[i][j]+predicted_block[i1][j];
m5[i1]=predicted_block[i][j]-predicted_block[i1][j];
}
predicted_block[0][j]=(m5[0]+m5[1]);
predicted_block[2][j]=(m5[0]-m5[1]);
predicted_block[1][j]=m5[3]*2+m5[2];
predicted_block[3][j]=m5[3]-m5[2]*2;
}
// Vertival transform
for (i=0; i < BLOCK_SIZE; i++)
{
for (j=0; j < 2; j++)
{
j1=3-j;
m5[j]=predicted_block[i][j]+predicted_block[i][j1];
m5[j1]=predicted_block[i][j]-predicted_block[i][j1];
}
predicted_block[i][0]=(m5[0]+m5[1]);
predicted_block[i][2]=(m5[0]-m5[1]);
predicted_block[i][1]=m5[3]*2+m5[2];
predicted_block[i][3]=m5[3]-m5[2]*2;
}
for (j=0;jcof[i0][j0][i][j]=(img->cof[i0][j0][i][j] >> qp_per) / dequant_coef[qp_rem][i][j];
ilev=((img->cof[i0][j0][i][j]*dequant_coef[qp_rem][i][j]*A[i][j]<< qp_per) >>6)+predicted_block[i][j] ;
img->cof[i0][j0][i][j]=sign((abs(ilev) * quant_coef[qp_rem_sp][i][j] + qp_const2) >> q_bits_sp, ilev) * dequant_coef[qp_rem_sp][i][j] << qp_per_sp;
}
// horizontal
for (j=0;jcof[i0][j0][i][j];
}
m6[0]=(m5[0]+m5[2]);
m6[1]=(m5[0]-m5[2]);
m6[2]=(m5[1]>>1)-m5[3];
m6[3]=m5[1]+(m5[3]>>1);
for (i=0;i<2;i++)
{
i1=3-i;
img->m7[i][j]=m6[i]+m6[i1];
img->m7[i1][j]=m6[i]-m6[i1];
}
}
// vertical
for (i=0;im7[i][j];
m6[0]=(m5[0]+m5[2]);
m6[1]=(m5[0]-m5[2]);
m6[2]=(m5[1]>>1)-m5[3];
m6[3]=m5[1]+(m5[3]>>1);
for (j=0;j<2;j++)
{
j1=3-j;
img->m7[i][j] =mmax(0,mmin(255,(m6[j]+m6[j1]+DQ_ROUND)>>DQ_BITS));
img->m7[i][j1]=mmax(0,mmin(255,(m6[j]-m6[j1]+DQ_ROUND)>>DQ_BITS));
}
}
}
/*!
***********************************************************************
* \brief
* The routine performs transform,quantization,inverse transform, adds the diff.
* to the prediction and writes the result to the decoded luma frame. Includes the
* RD constrained quantization also.
*
* \par Input:
* block_x,block_y: Block position inside a macro block (0,4,8,12).
*
* \par Output:
* nonzero: 0 if no levels are nonzero. 1 if there are nonzero levels. \n
* coeff_cost: Counter for nonzero coefficients, used to discard expencive levels.
************************************************************************
*/
void copyblock_sp(struct img_par *img,int block_x,int block_y)
{
int sign(int a,int b);
int i,j,i1,j1,m5[4],m6[4];
int predicted_block[BLOCK_SIZE][BLOCK_SIZE];
int qp_per = (img->qpsp-MIN_QP)/6;
int qp_rem = (img->qpsp-MIN_QP)%6;
int q_bits = Q_BITS+qp_per;
int qp_const2=(1<mpr[i+block_x][j+block_y];
for (j=0; j < BLOCK_SIZE; j++)
{
for (i=0; i < 2; i++)
{
i1=3-i;
m5[i]=predicted_block[i][j]+predicted_block[i1][j];
m5[i1]=predicted_block[i][j]-predicted_block[i1][j];
}
predicted_block[0][j]=(m5[0]+m5[1]);
predicted_block[2][j]=(m5[0]-m5[1]);
predicted_block[1][j]=m5[3]*2+m5[2];
predicted_block[3][j]=m5[3]-m5[2]*2;
}
// Vertival transform
for (i=0; i < BLOCK_SIZE; i++)
{
for (j=0; j < 2; j++)
{
j1=3-j;
m5[j]=predicted_block[i][j]+predicted_block[i][j1];
m5[j1]=predicted_block[i][j]-predicted_block[i][j1];
}
predicted_block[i][0]=(m5[0]+m5[1]);
predicted_block[i][2]=(m5[0]-m5[1]);
predicted_block[i][1]=m5[3]*2+m5[2];
predicted_block[i][3]=m5[3]-m5[2]*2;
}
// Quant
for (j=0;j < BLOCK_SIZE; j++)
for (i=0; i < BLOCK_SIZE; i++)
img->m7[i][j]=sign((abs(predicted_block[i][j])* quant_coef[qp_rem][i][j]+qp_const2)>> q_bits,predicted_block[i][j])*dequant_coef[qp_rem][i][j]<m7[i][j];
}
m6[0]=(m5[0]+m5[2]);
m6[1]=(m5[0]-m5[2]);
m6[2]=(m5[1]>>1)-m5[3];
m6[3]=m5[1]+(m5[3]>>1);
for (i=0;i<2;i++)
{
i1=3-i;
img->m7[i][j]=m6[i]+m6[i1];
img->m7[i1][j]=m6[i]-m6[i1];
}
}
// vertical
for (i=0;im7[i][j];
m6[0]=(m5[0]+m5[2]);
m6[1]=(m5[0]-m5[2]);
m6[2]=(m5[1]>>1)-m5[3];
m6[3]=m5[1]+(m5[3]>>1);
for (j=0;j<2;j++)
{
j1=3-j;
img->m7[i][j] =mmax(0,mmin(255,(m6[j]+m6[j1]+DQ_ROUND)>>DQ_BITS));
img->m7[i][j1]=mmax(0,mmin(255,(m6[j]-m6[j1]+DQ_ROUND)>>DQ_BITS));
}
}
// Decoded block moved to frame memory
for (j=0; j < BLOCK_SIZE; j++)
for (i=0; i < BLOCK_SIZE; i++)
imgY[img->pix_y+block_y+j][img->pix_x+block_x+i]=img->m7[i][j];
}
void itrans_sp_chroma(struct img_par *img,int ll)
{
int i,j,i1,j2,ilev,n2,n1,j1,mb_y;
int m5[BLOCK_SIZE];
int predicted_chroma_block[MB_BLOCK_SIZE/2][MB_BLOCK_SIZE/2],mp1[BLOCK_SIZE];
int qp_per,qp_rem,q_bits;
int qp_per_sp,qp_rem_sp,q_bits_sp,qp_const2;
qp_per = ((img->qp<0?img->qp:QP_SCALE_CR[img->qp])-MIN_QP)/6;
qp_rem = ((img->qp<0?img->qp:QP_SCALE_CR[img->qp])-MIN_QP)%6;
q_bits = Q_BITS+qp_per;
qp_per_sp = ((img->qpsp<0?img->qpsp:QP_SCALE_CR[img->qpsp])-MIN_QP)/6;
qp_rem_sp = ((img->qpsp<0?img->qpsp:QP_SCALE_CR[img->qpsp])-MIN_QP)%6;
q_bits_sp = Q_BITS+qp_per_sp;
qp_const2=(1<sp_switch || img->type == SI_IMG)
{
qp_per = ((img->qpsp < 0 ? img->qpsp : QP_SCALE_CR[img->qpsp]) - MIN_QP) / 6;
qp_rem = ((img->qpsp < 0 ? img->qpsp : QP_SCALE_CR[img->qpsp]) - MIN_QP) % 6;
q_bits = Q_BITS + qp_per;
}
for (j=0; j < MB_BLOCK_SIZE/2; j++)
for (i=0; i < MB_BLOCK_SIZE/2; i++)
{
predicted_chroma_block[i][j]=img->mpr[i][j];
img->mpr[i][j]=0;
}
for (n2=0; n2 <= BLOCK_SIZE; n2 += BLOCK_SIZE)
{
for (n1=0; n1 <= BLOCK_SIZE; n1 += BLOCK_SIZE)
{
// Horizontal transform.
for (j=0; j < BLOCK_SIZE; j++)
{
mb_y=n2+j;
for (i=0; i < 2; i++)
{
i1=3-i;
m5[i]=predicted_chroma_block[i+n1][mb_y]+predicted_chroma_block[i1+n1][mb_y];
m5[i1]=predicted_chroma_block[i+n1][mb_y]-predicted_chroma_block[i1+n1][mb_y];
}
predicted_chroma_block[n1][mb_y] =(m5[0]+m5[1]);
predicted_chroma_block[n1+2][mb_y]=(m5[0]-m5[1]);
predicted_chroma_block[n1+1][mb_y]=m5[3]*2+m5[2];
predicted_chroma_block[n1+3][mb_y]=m5[3]-m5[2]*2;
}
// Vertical transform.
for (i=0; i < BLOCK_SIZE; i++)
{
j1=n1+i;
for (j=0; j < 2; j++)
{
j2=3-j;
m5[j]=predicted_chroma_block[j1][n2+j]+predicted_chroma_block[j1][n2+j2];
m5[j2]=predicted_chroma_block[j1][n2+j]-predicted_chroma_block[j1][n2+j2];
}
predicted_chroma_block[j1][n2+0]=(m5[0]+m5[1]);
predicted_chroma_block[j1][n2+2]=(m5[0]-m5[1]);
predicted_chroma_block[j1][n2+1]=m5[3]*2+m5[2];
predicted_chroma_block[j1][n2+3]=m5[3]-m5[2]*2;
}
}
}
// 2X2 transform of DC coeffs.
mp1[0]=(predicted_chroma_block[0][0]+predicted_chroma_block[4][0]+predicted_chroma_block[0][4]+predicted_chroma_block[4][4]);
mp1[1]=(predicted_chroma_block[0][0]-predicted_chroma_block[4][0]+predicted_chroma_block[0][4]-predicted_chroma_block[4][4]);
mp1[2]=(predicted_chroma_block[0][0]+predicted_chroma_block[4][0]-predicted_chroma_block[0][4]-predicted_chroma_block[4][4]);
mp1[3]=(predicted_chroma_block[0][0]-predicted_chroma_block[4][0]-predicted_chroma_block[0][4]+predicted_chroma_block[4][4]);
for (n1=0; n1 < 2; n1 ++)
for (n2=0; n2 < 2; n2 ++)
{
ilev=((img->cof[n1+ll][4+n2][0][0]*dequant_coef[qp_rem][0][0]*A[0][0]<< qp_per) >>5)+mp1[n1+n2*2] ;
mp1[n1+n2*2]=sign((abs(ilev)* quant_coef[qp_rem_sp][0][0]+ 2 * qp_const2)>> (q_bits_sp+1),ilev)*dequant_coef[qp_rem_sp][0][0]<cof[n1+ll][4+n2][i][j] = (img->cof[n1+ll][4+n2][i][j] >> qp_per) / dequant_coef[qp_rem][i][j];
ilev=((img->cof[n1+ll][4+n2][i][j]*dequant_coef[qp_rem][i][j]*A[i][j]<< qp_per) >>6)+predicted_chroma_block[n1*BLOCK_SIZE+i][n2*BLOCK_SIZE+j] ;
img->cof[n1+ll][4+n2][i][j] = sign((abs(ilev) * quant_coef[qp_rem_sp][i][j] + qp_const2)>> q_bits_sp,ilev)*dequant_coef[qp_rem_sp][i][j]<cof[0+ll][4][0][0]=(mp1[0]+mp1[1]+mp1[2]+mp1[3])>>1;
img->cof[1+ll][4][0][0]=(mp1[0]-mp1[1]+mp1[2]-mp1[3])>>1;
img->cof[0+ll][5][0][0]=(mp1[0]+mp1[1]-mp1[2]-mp1[3])>>1;
img->cof[1+ll][5][0][0]=(mp1[0]-mp1[1]-mp1[2]+mp1[3])>>1;
}
int sign(int a , int b)
{
int x;
x=abs(a);
if (b>0)
return(x);
else return(-x);
}