📄 transform8x8.c
字号:
}
if (img->AdaptiveRounding)
{
for (j=0; j<8; j++)
memcpy(&img->fadjust8x8[1][block_y+j][block_x], &fadjust8x8[1][block_y+j][block_x], 8 * sizeof(int));
}
//===== restore reconstruction and prediction (needed if single coeffs are removed) =====
for (y=0; y<8; y++)
{
memcpy(&enc_picture->imgY[pic_pix_y+y][pic_pix_x], rec8x8[y], 8 * sizeof(imgpel));
memcpy(&img->mpr[block_y+y][block_x], img->mprr_3[best_ipmode][y], 8 * sizeof(imgpel));
}
}
return nonzero;
}
// 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..P, and from above left X, as follows:
//
// Z A B C D E F G H I J K L M N O P
// Q a1 b1 c1 d1 e1 f1 g1 h1
// R a2 b2 c2 d2 e2 f2 g2 h2
// S a3 b3 c3 d3 e3 f3 g3 h3
// T a4 b4 c4 d4 e4 f4 g4 h4
// U a5 b5 c5 d5 e5 f5 g5 h5
// V a6 b6 c6 d6 e6 f6 g6 h6
// W a7 b7 c7 d7 e7 f7 g7 h7
// X a8 b8 c8 d8 e8 f8 g8 h8
// Predictor array index definitions
#define P_Z (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])
#define P_M (PredPel[13])
#define P_N (PredPel[14])
#define P_O (PredPel[15])
#define P_P (PredPel[16])
#define P_Q (PredPel[17])
#define P_R (PredPel[18])
#define P_S (PredPel[19])
#define P_T (PredPel[20])
#define P_U (PredPel[21])
#define P_V (PredPel[22])
#define P_W (PredPel[23])
#define P_X (PredPel[24])
/*!
************************************************************************
* \brief
* Make intra 8x8 prediction according to all 9 prediction modes.
* The routine uses left and upper neighbouring points from
* previous coded blocks to do this (if available). Notice that
* inaccessible neighbouring points are signalled with a negative
* value in the predmode array .
*
* \par Input:
* Starting point of current 8x8 block image posision
*
* \par Output:
* none
************************************************************************
*/
void intrapred_luma8x8(int img_x,int img_y, int *left_available, int *up_available, int *all_available)
{
int i,j;
int s0;
static imgpel PredPel[25]; // array of predictor pels
imgpel **imgY = enc_picture->imgY; // For MB level frame/field coding tools -- set default to imgY
imgpel *imgYpel;
imgpel (*cur_pred)[8];
int ioff = (img_x & 15);
int joff = (img_y & 15);
int mb_nr=img->current_mb_nr;
PixelPos pix_a[8];
PixelPos pix_b, pix_c, pix_d;
int block_available_up;
int block_available_left;
int block_available_up_left;
int block_available_up_right;
for (i=0;i<8;i++)
{
getNeighbour(mb_nr, ioff -1 , joff +i , IS_LUMA, &pix_a[i]);
}
getNeighbour(mb_nr, ioff , joff -1 , IS_LUMA, &pix_b);
getNeighbour(mb_nr, ioff +8 , joff -1 , IS_LUMA, &pix_c);
getNeighbour(mb_nr, ioff -1 , joff -1 , IS_LUMA, &pix_d);
pix_c.available = pix_c.available &&!(ioff == 8 && joff == 8);
if (input->UseConstrainedIntraPred)
{
for (i=0, block_available_left=1; i<8;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_right = pix_c.available ? img->intra_block [pix_c.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_right = pix_c.available;
block_available_up_left = pix_d.available;
}
*left_available = block_available_left;
*up_available = block_available_up;
*all_available = block_available_up && block_available_left && block_available_up_left;
i = (img_x & 15);
j = (img_y & 15);
// form predictor pels
// form predictor pels
if (block_available_up)
{
imgYpel = &imgY[pix_b.pos_y][pix_b.pos_x];
P_A = *(imgYpel++);
P_B = *(imgYpel++);
P_C = *(imgYpel++);
P_D = *(imgYpel++);
P_E = *(imgYpel++);
P_F = *(imgYpel++);
P_G = *(imgYpel++);
P_H = *(imgYpel);
}
else
{
P_A = P_B = P_C = P_D = P_E = P_F = P_G = P_H = img->dc_pred_value_luma;
}
if (block_available_up_right)
{
imgYpel = &imgY[pix_c.pos_y][pix_c.pos_x];
P_I = *(imgYpel++);
P_J = *(imgYpel++);
P_K = *(imgYpel++);
P_L = *(imgYpel++);
P_M = *(imgYpel++);
P_N = *(imgYpel++);
P_O = *(imgYpel++);
P_P = *(imgYpel);
}
else
{
P_I = P_J = P_K = P_L = P_M = P_N = P_O = P_P = P_H;
}
if (block_available_left)
{
P_Q = imgY[pix_a[0].pos_y][pix_a[0].pos_x];
P_R = imgY[pix_a[1].pos_y][pix_a[1].pos_x];
P_S = imgY[pix_a[2].pos_y][pix_a[2].pos_x];
P_T = imgY[pix_a[3].pos_y][pix_a[3].pos_x];
P_U = imgY[pix_a[4].pos_y][pix_a[4].pos_x];
P_V = imgY[pix_a[5].pos_y][pix_a[5].pos_x];
P_W = imgY[pix_a[6].pos_y][pix_a[6].pos_x];
P_X = imgY[pix_a[7].pos_y][pix_a[7].pos_x];
}
else
{
P_Q = P_R = P_S = P_T = P_U = P_V = P_W = P_X = img->dc_pred_value_luma;
}
if (block_available_up_left)
{
P_Z = imgY[pix_d.pos_y][pix_d.pos_x];
}
else
{
P_Z = img->dc_pred_value_luma;
}
for(i=0;i<9;i++)
img->mprr_3[i][0][0]=-1;
LowPassForIntra8x8Pred(&(P_Z), block_available_up_left, block_available_up, block_available_left);
///////////////////////////////
// make DC prediction
///////////////////////////////
s0 = 0;
if (block_available_up && block_available_left)
{
// no edge
s0 = rshift_rnd_sf((P_A + P_B + P_C + P_D + P_E + P_F + P_G + P_H + P_Q + P_R + P_S + P_T + P_U + P_V + P_W + P_X), 4);
}
else if (!block_available_up && block_available_left)
{
// upper edge
s0 = rshift_rnd_sf((P_Q + P_R + P_S + P_T + P_U + P_V + P_W + P_X), 3);
}
else if (block_available_up && !block_available_left)
{
// left edge
s0 = rshift_rnd_sf((P_A + P_B + P_C + P_D + P_E + P_F + P_G + P_H), 3);
}
else //if (!block_available_up && !block_available_left)
{
// top left corner, nothing to predict from
s0 = img->dc_pred_value_luma;
}
// store DC prediction
cur_pred = img->mprr_3[DC_PRED];
for (j=0; j < 2*BLOCK_SIZE; j++)
{
for (i=0; i < 2*BLOCK_SIZE; i++)
{
cur_pred[i][j] = (imgpel) s0;
}
}
///////////////////////////////
// make horiz and vert prediction
///////////////////////////////
cur_pred = img->mprr_3[VERT_PRED];
for (i=0; i < 2*BLOCK_SIZE; i++)
{
cur_pred[0][i] =
cur_pred[1][i] =
cur_pred[2][i] =
cur_pred[3][i] =
cur_pred[4][i] =
cur_pred[5][i] =
cur_pred[6][i] =
cur_pred[7][i] = (imgpel)(&P_A)[i];
}
if(!block_available_up)
cur_pred[0][0]=-1;
cur_pred = img->mprr_3[HOR_PRED];
for (i=0; i < 2*BLOCK_SIZE; i++)
{
cur_pred[i][0] =
cur_pred[i][1] =
cur_pred[i][2] =
cur_pred[i][3] =
cur_pred[i][4] =
cur_pred[i][5] =
cur_pred[i][6] =
cur_pred[i][7] = (imgpel) (&P_Q)[i];
}
if(!block_available_left)
cur_pred[0][0]=-1;
///////////////////////////////////
// make diagonal down left prediction
///////////////////////////////////
if (block_available_up)
{
// Mode DIAG_DOWN_LEFT_PRED
cur_pred = img->mprr_3[DIAG_DOWN_LEFT_PRED];
cur_pred[0][0] = (imgpel) ((P_A + P_C + 2*(P_B) + 2) >> 2);
cur_pred[0][1] =
cur_pred[1][0] = (imgpel) ((P_B + P_D + 2*(P_C) + 2) >> 2);
cur_pred[0][2] =
cur_pred[1][1] =
cur_pred[2][0] = (imgpel) ((P_C + P_E + 2*(P_D) + 2) >> 2);
cur_pred[0][3] =
cur_pred[1][2] =
cur_pred[2][1] =
cur_pred[3][0] = (imgpel) ((P_D + P_F + 2*(P_E) + 2) >> 2);
cur_pred[0][4] =
cur_pred[1][3] =
cur_pred[2][2] =
cur_pred[3][1] =
cur_pred[4][0] = (imgpel) ((P_E + P_G + 2*(P_F) + 2) >> 2);
cur_pred[0][5] =
cur_pred[1][4] =
cur_pred[2][3] =
cur_pred[3][2] =
cur_pred[4][1] =
cur_pred[5][0] = (imgpel) ((P_F + P_H + 2*(P_G) + 2) >> 2);
cur_pred[0][6] =
cur_pred[1][5] =
cur_pred[2][4] =
cur_pred[3][3] =
cur_pred[4][2] =
cur_pred[5][1] =
cur_pred[6][0] = (imgpel) ((P_G + P_I + 2*(P_H) + 2) >> 2);
cur_pred[0][7] =
cur_pred[1][6] =
cur_pred[2][5] =
cur_pred[3][4] =
cur_pred[4][3] =
cur_pred[5][2] =
cur_pred[6][1] =
cur_pred[7][0] = (imgpel) ((P_H + P_J + 2*(P_I) + 2) >> 2);
cur_pred[1][7] =
cur_pred[2][6] =
cur_pred[3][5] =
cur_pred[4][4] =
cur_pred[5][3] =
cur_pred[6][2] =
cur_pred[7][1] = (imgpel) ((P_I + P_K + 2*(P_J) + 2) >> 2);
cur_pred[2][7] =
cur_pred[3][6] =
cur_pred[4][5] =
cur_pred[5][4] =
cur_pred[6][3] =
cur_pred[7][2] = (imgpel) ((P_J + P_L + 2*(P_K) + 2) >> 2);
cur_pred[3][7] =
cur_pred[4][6] =
cur_pred[5][5] =
cur_pred[6][4] =
cur_pred[7][3] = (imgpel) ((P_K + P_M + 2*(P_L) + 2) >> 2);
cur_pred[4][7] =
cur_pred[5][6] =
cur_pred[6][5] =
cur_pred[7][4] = (imgpel) ((P_L + P_N + 2*(P_M) + 2) >> 2);
cur_pred[5][7] =
cur_pred[6][6] =
cur_pred[7][5] = (imgpel) ((P_M + P_O + 2*(P_N) + 2) >> 2);
cur_pred[6][7] =
cur_pred[7][6] = (imgpel) ((P_N + P_P + 2*(P_O) + 2) >> 2);
cur_pred[7][7] = (imgpel) ((P_O + 3*(P_P) + 2) >> 2);
///////////////////////////////////
// make vertical left prediction
///////////////////////////////////
cur_pred = img->mprr_3[VERT_LEFT_PRED];
cur_pred[0][0] = (imgpel) ((P_A + P_B + 1) >> 1);
cur_pred[0][1] =
cur_pred[2][0] = (imgpel) ((P_B + P_C + 1) >> 1);
cur_pred[0][2] =
cur_pred[2][1] =
cur_pred[4][0] = (imgpel) ((P_C + P_D + 1) >> 1);
cur_pred[0][3] =
cur_pred[2][2] =
cur_pred[4][1] =
cur_pred[6][0] = (imgpel) ((P_D + P_E + 1) >> 1);
cur_pred[0][4] =
cur_pred[2][3] =
cur_pred[4][2] =
cur_pred[6][1] = (imgpel) ((P_E + P_F + 1) >> 1);
cur_pred[0][5] =
cur_pred[2][4] =
cur_pred[4][3] =
cur_pred[6][2] = (imgpel) ((P_F + P_G + 1) >> 1);
cur_pred[0][6] =
cur_pred[2][5] =
cur_pred[4][4] =
cur_pred[6][3] = (imgpel) ((P_G + P_H + 1) >> 1);
cur_pred[0][7] =
cur_pred[2][6] =
cur_pred[4][5] =
cur_pred[6][4] = (imgpel) ((P_H + P_I + 1) >> 1);
cur_pred[2][7] =
cur_pred[4][6] =
cur_pred[6][5] = (imgpel) ((P_I + P_J + 1) >> 1);
cur_pred[4][7] =
cur_pred[6][6] = (imgpel) ((P_J + P_K + 1) >> 1);
cur_pred[6][7] = (imgpel) ((P_K + P_L + 1) >> 1);
cur_pred[1][0] = (imgpel) ((P_A + P_C + 2*P_B + 2) >> 2);
cur_pred[1][1] =
cur_pred[3][0] = (imgpel) ((P_B + P_D + 2*P_C + 2) >> 2);
cur_pred[1][2] =
cur_pred[3][1] =
cur_pred[5][0] = (imgpel) ((P_C + P_E + 2*P_D + 2) >> 2);
cur_pred[1][3] =
cur_pred[3][2] =
cur_pred[5][1] =
cur_pred[7][0] = (imgpel) ((P_D + P_F + 2*P_E + 2) >> 2);
cur_pred[1][4] =
cur_pred[3][3] =
cur_pred[5][2] =
cur_pred[7][1] = (imgpel) ((P_E + P_G + 2*P_F + 2) >> 2);
cur_pred[1][5] =
cur_pred[3][4] =
cur_pred[5][3] =
cur_pred[7][2] = (imgpel) ((P_F + P_H + 2*P_G + 2) >> 2);
cur_pred[1][6] =
cur_pred[3][5] =
cur_pred[5][4] =
cur_pred[7][3] = (imgpel) ((P_G + P_I + 2*P_H + 2) >> 2);
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -