ref: a742a736550c4fc1120c06832749bced0a209e1b
dir: /vp8/common/reconintra.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <stdio.h>
#include "vpx_ports/config.h"
#include "recon.h"
#include "reconintra.h"
#include "vpx_mem/vpx_mem.h"
/* For skip_recon_mb(), add vp8_build_intra_predictors_mby_s(MACROBLOCKD *x) and
* vp8_build_intra_predictors_mbuv_s(MACROBLOCKD *x).
*/
#if CONFIG_NEWINTRAMODES
void d27_predictor(unsigned char *ypred_ptr, int y_stride, int n,
unsigned char *yabove_row, unsigned char *yleft_col)
{
int r, c, h, w, v;
int a, b;
r = 0;
for (c = 0; c < n-2; c++)
{
if (c&1)
a = yleft_col[r + 1];
else
a = (yleft_col[r] + yleft_col[r + 1] + 1) >> 1;
b = yabove_row[c + 2];
ypred_ptr[c] = (2 * a + (c + 1) * b + (c + 3)/2) / (c + 3);
}
for (r = 1; r < n/2 - 1; r++)
{
for (c = 0; c < n - 2 - 2 * r; c++)
{
if (c&1)
a = yleft_col[r + 1];
else
a = (yleft_col[r] + yleft_col[r + 1] + 1) >> 1;
b = ypred_ptr[(r - 1) * y_stride + c + 2];
ypred_ptr[r * y_stride + c] = (2 * a + (c + 1) * b + (c + 3)/2) / (c + 3);
}
}
for (; r < n - 1; ++r)
{
for (c = 0; c < n; c++)
{
v = (c & 1 ? yleft_col[r + 1] : (yleft_col[r] + yleft_col[r + 1] + 1) >> 1);
h = r - c/2;
ypred_ptr[h * y_stride + c] = v;
}
}
c = 0;
r = n - 1;
ypred_ptr[r * y_stride] = (ypred_ptr[(r - 1) * y_stride] +
yleft_col[r] + 1) >> 1;
for (r = n - 2; r >= n/2; --r)
{
w = c + (n - 1 - r) * 2;
ypred_ptr[r * y_stride + w] = (ypred_ptr[(r - 1) * y_stride + w] +
ypred_ptr[r * y_stride + w - 1] + 1) >> 1;
}
for (c = 1; c < n; c++)
{
for (r = n - 1; r >= n/2 + c/2; --r)
{
w = c + (n - 1 - r) * 2;
ypred_ptr[r * y_stride + w] = (ypred_ptr[(r - 1) * y_stride + w] +
ypred_ptr[r * y_stride + w - 1] + 1) >> 1;
}
}
}
void d63_predictor(unsigned char *ypred_ptr, int y_stride, int n,
unsigned char *yabove_row, unsigned char *yleft_col)
{
int r, c, h, w, v;
int a, b;
c = 0;
for (r = 0; r < n-2; r++)
{
if (r&1)
a = yabove_row[c + 1];
else
a = (yabove_row[c] + yabove_row[c + 1] + 1) >> 1;
b = yleft_col[r + 2];
ypred_ptr[r * y_stride] = (2 * a + (r + 1) * b + (r + 3)/2) / (r + 3);
}
for (c = 1; c < n/2 - 1; c++)
{
for (r = 0; r < n - 2 - 2 * c; r++)
{
if (r&1)
a = yabove_row[c + 1];
else
a = (yabove_row[c] + yabove_row[c + 1] + 1) >> 1;
b = ypred_ptr[(r + 2) * y_stride + c - 1];
ypred_ptr[r * y_stride + c] = (2 * a + (c + 1) * b + (c + 3)/2) / (c + 3);
}
}
for (; c < n - 1; ++c)
{
for (r = 0; r < n; r++)
{
v = (r & 1 ? yabove_row[c + 1] : (yabove_row[c] + yabove_row[c + 1] + 1) >> 1);
w = c - r/2;
ypred_ptr[r * y_stride + w] = v;
}
}
r = 0;
c = n - 1;
ypred_ptr[c] = (ypred_ptr[(c - 1)] + yabove_row[c] + 1) >> 1;
for (c = n - 2; c >= n/2; --c)
{
h = r + (n - 1 - c) * 2;
ypred_ptr[h * y_stride + c] = (ypred_ptr[h * y_stride + c - 1] +
ypred_ptr[(h - 1) * y_stride + c] + 1) >> 1;
}
for (r = 1; r < n; r++)
{
for (c = n - 1; c >= n/2 + r/2; --c)
{
h = r + (n - 1 - c) * 2;
ypred_ptr[h * y_stride + c] = (ypred_ptr[h * y_stride + c - 1] +
ypred_ptr[(h - 1) * y_stride + c] + 1) >> 1;
}
}
}
void d45_predictor(unsigned char *ypred_ptr, int y_stride, int n,
unsigned char *yabove_row, unsigned char *yleft_col)
{
int r, c;
for (r = 0; r < n - 1; ++r)
{
for (c = 0; c <= r; ++c)
{
ypred_ptr[(r - c) * y_stride + c] =
(yabove_row[r+1] * (c + 1) +
yleft_col[r+1] * (r - c + 1) + r/2 + 1) / (r + 2);
}
}
for (c = 0; c <= r; ++c)
{
int yabove_ext = yabove_row[r]; //2*yabove_row[r] - yabove_row[r-1];
int yleft_ext = yleft_col[r]; //2*yleft_col[r] - yleft_col[r-1];
yabove_ext = (yabove_ext > 255 ? 255 : (yabove_ext < 0 ? 0 : yabove_ext));
yleft_ext = (yleft_ext > 255 ? 255 : (yleft_ext < 0 ? 0 : yleft_ext));
ypred_ptr[(r - c) * y_stride + c] =
(yabove_ext * (c + 1) +
yleft_ext * (r - c + 1) + r/2 + 1) / (r + 2);
}
for (r = 1; r < n; ++r)
{
for (c = n - r; c < n; ++c)
ypred_ptr[r * y_stride + c] = (ypred_ptr[(r - 1) * y_stride + c] +
ypred_ptr[r * y_stride + c - 1] + 1) >> 1;
}
}
void d117_predictor(unsigned char *ypred_ptr, int y_stride, int n,
unsigned char *yabove_row, unsigned char *yleft_col)
{
int r, c;
for (c = 0; c < n; c++)
ypred_ptr[c] = (yabove_row[c-1] + yabove_row[c] + 1) >> 1;
ypred_ptr += y_stride;
for (c = 0; c < n; c++)
ypred_ptr[c] = yabove_row[c-1];
ypred_ptr += y_stride;
for (r = 2; r < n; ++r)
{
ypred_ptr[0] = yleft_col[r - 2];
for (c = 1; c < n; c++)
ypred_ptr[c] = ypred_ptr[-2*y_stride+c-1];
ypred_ptr += y_stride;
}
}
void d135_predictor(unsigned char *ypred_ptr, int y_stride, int n,
unsigned char *yabove_row, unsigned char *yleft_col)
{
int r, c;
ypred_ptr[0] = yabove_row[-1];
for (c = 1; c < n; c++)
ypred_ptr[c] = yabove_row[c - 1];
for (r = 1; r < n; ++r)
ypred_ptr[r * y_stride] = yleft_col[r - 1];
ypred_ptr += y_stride;
for (r = 1; r < n; ++r)
{
for (c = 1; c < n; c++)
{
ypred_ptr[c] = ypred_ptr[-y_stride + c - 1];
}
ypred_ptr += y_stride;
}
}
void d153_predictor(unsigned char *ypred_ptr, int y_stride, int n,
unsigned char *yabove_row, unsigned char *yleft_col)
{
int r, c;
ypred_ptr[0] = (yabove_row[-1] + yleft_col[0] + 1) >> 1;
for (r = 1; r < n; r++)
ypred_ptr[r * y_stride] = (yleft_col[r-1] + yleft_col[r] + 1) >> 1;
ypred_ptr++;
ypred_ptr[0] = yabove_row[-1];
for (r = 1; r < n; r++)
ypred_ptr[r * y_stride] = yleft_col[r-1];
ypred_ptr++;
for (c = 0; c < n - 2; c++)
ypred_ptr[c] = yabove_row[c];
ypred_ptr += y_stride;
for (r = 1; r < n; ++r)
{
for (c = 0; c < n - 2; c++)
ypred_ptr[c] = ypred_ptr[-y_stride+c-2];
ypred_ptr += y_stride;
}
}
#endif /* CONFIG_NEWINTRAMODES */
void vp8_recon_intra_mbuv(const vp8_recon_rtcd_vtable_t *rtcd, MACROBLOCKD *x)
{
int i;
for (i = 16; i < 24; i += 2)
{
BLOCKD *b = &x->block[i];
RECON_INVOKE(rtcd, recon2)(b->predictor, b->diff, *(b->base_dst) + b->dst, b->dst_stride);
}
}
void vp8_build_intra_predictors_mby_internal(MACROBLOCKD *x, unsigned char *ypred_ptr, int y_stride, int mode)
{
unsigned char *yabove_row = x->dst.y_buffer - x->dst.y_stride;
unsigned char yleft_col[16];
unsigned char ytop_left = yabove_row[-1];
int r, c, i;
for (i = 0; i < 16; i++)
{
yleft_col[i] = x->dst.y_buffer [i* x->dst.y_stride -1];
}
/* for Y */
switch (mode)
{
case DC_PRED:
{
int expected_dc;
int i;
int shift;
int average = 0;
if (x->up_available || x->left_available)
{
if (x->up_available)
{
for (i = 0; i < 16; i++)
{
average += yabove_row[i];
}
}
if (x->left_available)
{
for (i = 0; i < 16; i++)
{
average += yleft_col[i];
}
}
shift = 3 + x->up_available + x->left_available;
expected_dc = (average + (1 << (shift - 1))) >> shift;
}
else
{
expected_dc = 128;
}
for (r = 0; r < 16; r++)
{
vpx_memset(ypred_ptr, expected_dc, 16);
ypred_ptr += y_stride; /*16;*/
}
}
break;
case V_PRED:
{
for (r = 0; r < 16; r++)
{
((int *)ypred_ptr)[0] = ((int *)yabove_row)[0];
((int *)ypred_ptr)[1] = ((int *)yabove_row)[1];
((int *)ypred_ptr)[2] = ((int *)yabove_row)[2];
((int *)ypred_ptr)[3] = ((int *)yabove_row)[3];
ypred_ptr += y_stride;
}
}
break;
case H_PRED:
{
for (r = 0; r < 16; r++)
{
vpx_memset(ypred_ptr, yleft_col[r], 16);
ypred_ptr += y_stride;
}
}
break;
case TM_PRED:
{
for (r = 0; r < 16; r++)
{
for (c = 0; c < 16; c++)
{
int pred = yleft_col[r] + yabove_row[ c] - ytop_left;
if (pred < 0)
pred = 0;
if (pred > 255)
pred = 255;
ypred_ptr[c] = pred;
}
ypred_ptr += y_stride;
}
}
break;
#if CONFIG_NEWINTRAMODES
case D45_PRED:
{
d45_predictor(ypred_ptr, y_stride, 16, yabove_row, yleft_col);
}
break;
case D135_PRED:
{
d135_predictor(ypred_ptr, y_stride, 16, yabove_row, yleft_col);
}
break;
case D117_PRED:
{
d117_predictor(ypred_ptr, y_stride, 16, yabove_row, yleft_col);
}
break;
case D153_PRED:
{
d153_predictor(ypred_ptr, y_stride, 16, yabove_row, yleft_col);
}
break;
case D27_PRED:
{
d27_predictor(ypred_ptr, y_stride, 16, yabove_row, yleft_col);
}
break;
case D63_PRED:
{
d63_predictor(ypred_ptr, y_stride, 16, yabove_row, yleft_col);
}
break;
#endif
#if CONIFG_I8X8
case I8X8_PRED:
#endif
case B_PRED:
case NEARESTMV:
case NEARMV:
case ZEROMV:
case NEWMV:
case SPLITMV:
case MB_MODE_COUNT:
break;
}
}
void vp8_build_intra_predictors_mby(MACROBLOCKD *x)
{
vp8_build_intra_predictors_mby_internal(x, x->predictor, 16,
x->mode_info_context->mbmi.mode);
}
void vp8_build_intra_predictors_mby_s(MACROBLOCKD *x)
{
vp8_build_intra_predictors_mby_internal(x, x->dst.y_buffer, x->dst.y_stride,
x->mode_info_context->mbmi.mode);
}
#if CONFIG_COMP_INTRA_PRED
void vp8_build_comp_intra_predictors_mby(MACROBLOCKD *x)
{
unsigned char predictor[2][256];
int i;
vp8_build_intra_predictors_mby_internal(x, predictor[0], 16,
x->mode_info_context->mbmi.mode);
vp8_build_intra_predictors_mby_internal(x, predictor[1], 16,
x->mode_info_context->mbmi.second_mode);
for (i = 0; i < 256; i++)
{
x->predictor[i] = (predictor[0][i] + predictor[1][i] + 1) >> 1;
}
}
#endif
void vp8_build_intra_predictors_mbuv_internal(MACROBLOCKD *x,
unsigned char *upred_ptr,
unsigned char *vpred_ptr,
int uv_stride,
int mode)
{
unsigned char *uabove_row = x->dst.u_buffer - x->dst.uv_stride;
unsigned char uleft_col[16];
unsigned char utop_left = uabove_row[-1];
unsigned char *vabove_row = x->dst.v_buffer - x->dst.uv_stride;
unsigned char vleft_col[20];
unsigned char vtop_left = vabove_row[-1];
int i, j;
for (i = 0; i < 8; i++)
{
uleft_col[i] = x->dst.u_buffer [i* x->dst.uv_stride -1];
vleft_col[i] = x->dst.v_buffer [i* x->dst.uv_stride -1];
}
switch (mode)
{
case DC_PRED:
{
int expected_udc;
int expected_vdc;
int i;
int shift;
int Uaverage = 0;
int Vaverage = 0;
if (x->up_available)
{
for (i = 0; i < 8; i++)
{
Uaverage += uabove_row[i];
Vaverage += vabove_row[i];
}
}
if (x->left_available)
{
for (i = 0; i < 8; i++)
{
Uaverage += uleft_col[i];
Vaverage += vleft_col[i];
}
}
if (!x->up_available && !x->left_available)
{
expected_udc = 128;
expected_vdc = 128;
}
else
{
shift = 2 + x->up_available + x->left_available;
expected_udc = (Uaverage + (1 << (shift - 1))) >> shift;
expected_vdc = (Vaverage + (1 << (shift - 1))) >> shift;
}
/*vpx_memset(upred_ptr,expected_udc,64);*/
/*vpx_memset(vpred_ptr,expected_vdc,64);*/
for (i = 0; i < 8; i++)
{
vpx_memset(upred_ptr, expected_udc, 8);
vpx_memset(vpred_ptr, expected_vdc, 8);
upred_ptr += uv_stride; /*8;*/
vpred_ptr += uv_stride; /*8;*/
}
}
break;
case V_PRED:
{
int i;
for (i = 0; i < 8; i++)
{
vpx_memcpy(upred_ptr, uabove_row, 8);
vpx_memcpy(vpred_ptr, vabove_row, 8);
upred_ptr += uv_stride; /*8;*/
vpred_ptr += uv_stride; /*8;*/
}
}
break;
case H_PRED:
{
int i;
for (i = 0; i < 8; i++)
{
vpx_memset(upred_ptr, uleft_col[i], 8);
vpx_memset(vpred_ptr, vleft_col[i], 8);
upred_ptr += uv_stride; /*8;*/
vpred_ptr += uv_stride; /*8;*/
}
}
break;
case TM_PRED:
{
int i;
for (i = 0; i < 8; i++)
{
for (j = 0; j < 8; j++)
{
int predu = uleft_col[i] + uabove_row[j] - utop_left;
int predv = vleft_col[i] + vabove_row[j] - vtop_left;
if (predu < 0)
predu = 0;
if (predu > 255)
predu = 255;
if (predv < 0)
predv = 0;
if (predv > 255)
predv = 255;
upred_ptr[j] = predu;
vpred_ptr[j] = predv;
}
upred_ptr += uv_stride; /*8;*/
vpred_ptr += uv_stride; /*8;*/
}
}
break;
#if CONFIG_NEWINTRAMODES
case D45_PRED:
{
d45_predictor(upred_ptr, uv_stride, 8, uabove_row, uleft_col);
d45_predictor(vpred_ptr, uv_stride, 8, vabove_row, vleft_col);
}
break;
case D135_PRED:
{
d135_predictor(upred_ptr, uv_stride, 8, uabove_row, uleft_col);
d135_predictor(vpred_ptr, uv_stride, 8, vabove_row, vleft_col);
}
break;
case D117_PRED:
{
d117_predictor(upred_ptr, uv_stride, 8, uabove_row, uleft_col);
d117_predictor(vpred_ptr, uv_stride, 8, vabove_row, vleft_col);
}
break;
case D153_PRED:
{
d153_predictor(upred_ptr, uv_stride, 8, uabove_row, uleft_col);
d153_predictor(vpred_ptr, uv_stride, 8, vabove_row, vleft_col);
}
break;
case D27_PRED:
{
d27_predictor(upred_ptr, uv_stride, 8, uabove_row, uleft_col);
d27_predictor(vpred_ptr, uv_stride, 8, vabove_row, vleft_col);
}
break;
case D63_PRED:
{
d63_predictor(upred_ptr, uv_stride, 8, uabove_row, uleft_col);
d63_predictor(vpred_ptr, uv_stride, 8, vabove_row, vleft_col);
}
break;
#endif
case B_PRED:
case NEARESTMV:
case NEARMV:
case ZEROMV:
case NEWMV:
case SPLITMV:
case MB_MODE_COUNT:
break;
}
}
void vp8_build_intra_predictors_mbuv(MACROBLOCKD *x)
{
vp8_build_intra_predictors_mbuv_internal(x,
&x->predictor[256],
&x->predictor[320],
8,
x->mode_info_context->mbmi.uv_mode);
}
void vp8_build_intra_predictors_mbuv_s(MACROBLOCKD *x)
{
vp8_build_intra_predictors_mbuv_internal(x,
x->dst.u_buffer,
x->dst.v_buffer,
x->dst.uv_stride,
x->mode_info_context->mbmi.uv_mode);
}
#if CONFIG_COMP_INTRA_PRED
void vp8_build_comp_intra_predictors_mbuv(MACROBLOCKD *x)
{
unsigned char predictor[2][2][64];
int i;
vp8_build_intra_predictors_mbuv_internal(x, predictor[0][0], predictor[1][0], 8,
x->mode_info_context->mbmi.uv_mode);
vp8_build_intra_predictors_mbuv_internal(x, predictor[0][1], predictor[1][1], 8,
x->mode_info_context->mbmi.second_uv_mode);
for (i = 0; i < 64; i++)
{
x->predictor[256 + i] = (predictor[0][0][i] + predictor[0][1][i] + 1) >> 1;
x->predictor[256 + 64 + i] = (predictor[1][0][i] + predictor[1][1][i] + 1) >> 1;
}
}
#endif
void vp8_intra8x8_predict(BLOCKD *x,
int mode,
unsigned char *predictor)
{
unsigned char *yabove_row = *(x->base_dst) + x->dst - x->dst_stride;
unsigned char yleft_col[8];
unsigned char ytop_left = yabove_row[-1];
int r, c, i;
for (i = 0; i < 8; i++)
{
yleft_col[i] = (*(x->base_dst))[x->dst - 1 + i * x->dst_stride];
}
switch (mode)
{
case DC_PRED:
{
int expected_dc = 0;
for (i = 0; i < 8; i++)
{
expected_dc += yabove_row[i];
expected_dc += yleft_col[i];
}
expected_dc = (expected_dc + 8) >> 4;
for (r = 0; r < 8; r++)
{
for (c = 0; c < 8; c++)
{
predictor[c] = expected_dc;
}
predictor += 16;
}
}
break;
case V_PRED:
{
for (r = 0; r < 8; r++)
{
for (c = 0; c < 8; c++)
{
predictor[c] = yabove_row[c];
}
predictor += 16;
}
}
break;
case H_PRED:
{
for (r = 0; r < 8; r++)
{
for (c = 0; c < 8; c++)
{
predictor[c] = yleft_col[r];
}
predictor += 16;
}
}
break;
case TM_PRED:
{
/* prediction similar to true_motion prediction */
for (r = 0; r < 8; r++)
{
for (c = 0; c < 8; c++)
{
int pred = yabove_row[c] - ytop_left + yleft_col[r];
if (pred < 0)
pred = 0;
if (pred > 255)
pred = 255;
predictor[c] = pred;
}
predictor += 16;
}
}
break;
#if CONFIG_NEWINTRAMODES
case D45_PRED:
{
d45_predictor(predictor, 16, 8, yabove_row, yleft_col);
}
break;
case D135_PRED:
{
d135_predictor(predictor, 16, 8, yabove_row, yleft_col);
}
break;
case D117_PRED:
{
d117_predictor(predictor, 16, 8, yabove_row, yleft_col);
}
break;
case D153_PRED:
{
d153_predictor(predictor, 16, 8, yabove_row, yleft_col);
}
break;
case D27_PRED:
{
d27_predictor(predictor, 16, 8, yabove_row, yleft_col);
}
break;
case D63_PRED:
{
d63_predictor(predictor, 16, 8, yabove_row, yleft_col);
}
break;
#endif
}
}
#if CONFIG_COMP_INTRA_PRED
void vp8_comp_intra8x8_predict(BLOCKD *x,
int mode, int second_mode,
unsigned char *out_predictor)
{
unsigned char predictor[2][8*16];
int i, j;
vp8_intra8x8_predict(x, mode, predictor[0]);
vp8_intra8x8_predict(x, second_mode, predictor[1]);
for (i = 0; i < 8*16; i += 16)
{
for (j = i; j < i + 8; j++)
{
out_predictor[j] = (predictor[0][j] + predictor[1][j] + 1) >> 1;
}
}
}
#endif
void vp8_intra_uv4x4_predict(BLOCKD *x,
int mode,
unsigned char *predictor)
{
unsigned char *above_row = *(x->base_dst) + x->dst - x->dst_stride;
unsigned char left_col[4];
unsigned char top_left = above_row[-1];
int r, c, i;
for (i = 0; i < 4; i++)
{
left_col[i] = (*(x->base_dst))[x->dst - 1 + i * x->dst_stride];
}
switch (mode)
{
case DC_PRED:
{
int expected_dc = 0;
for (i = 0; i < 4; i++)
{
expected_dc += above_row[i];
expected_dc += left_col[i];
}
expected_dc = (expected_dc + 4) >> 3;
for (r = 0; r < 4; r++)
{
for (c = 0; c < 4; c++)
{
predictor[c] = expected_dc;
}
predictor += 8;
}
}
break;
case V_PRED:
{
for (r = 0; r < 4; r++)
{
for (c = 0; c < 4; c++)
{
predictor[c] = above_row[c];
}
predictor += 8;
}
}
break;
case H_PRED:
{
for (r = 0; r < 4; r++)
{
for (c = 0; c < 4; c++)
{
predictor[c] = left_col[r];
}
predictor += 8;
}
}
break;
case TM_PRED:
{
/* prediction similar to true_motion prediction */
for (r = 0; r < 4; r++)
{
for (c = 0; c < 4; c++)
{
int pred = above_row[c] - top_left + left_col[r];
if (pred < 0)
pred = 0;
if (pred > 255)
pred = 255;
predictor[c] = pred;
}
predictor += 8;
}
}
break;
#if CONFIG_NEWINTRAMODES
case D45_PRED:
{
d45_predictor(predictor, 8, 4, above_row, left_col);
}
break;
case D135_PRED:
{
d135_predictor(predictor, 8, 4, above_row, left_col);
}
break;
case D117_PRED:
{
d117_predictor(predictor, 8, 4, above_row, left_col);
}
break;
case D153_PRED:
{
d153_predictor(predictor, 8, 4, above_row, left_col);
}
break;
case D27_PRED:
{
d27_predictor(predictor, 8, 4, above_row, left_col);
}
break;
case D63_PRED:
{
d63_predictor(predictor, 8, 4, above_row, left_col);
}
break;
#endif
}
}
#if CONFIG_COMP_INTRA_PRED
void vp8_comp_intra_uv4x4_predict(BLOCKD *x,
int mode, int mode2,
unsigned char *out_predictor)
{
unsigned char predictor[2][8*4];
int i, j;
vp8_intra_uv4x4_predict(x, mode, predictor[0]);
vp8_intra_uv4x4_predict(x, mode2, predictor[1]);
for (i = 0; i < 4*8; i += 8)
{
for (j = i; j < i + 4; j++)
{
out_predictor[j] = (predictor[0][j] + predictor[1][j] + 1) >> 1;
}
}
}
#endif
/* TODO: try different ways of use Y-UV mode correlation
Current code assumes that a uv 4x4 block use same mode
as corresponding Y 8x8 area
*/