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uvg266/src/intra.c
Arttu Ylä-Outinen 3a10e9e3e0 Prefix all non-static symbols with "kvz_".
2015-08-26 13:02:28 +03:00

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/*****************************************************************************
* This file is part of Kvazaar HEVC encoder.
*
* Copyright (C) 2013-2015 Tampere University of Technology and others (see
* COPYING file).
*
* Kvazaar is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* Kvazaar is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with Kvazaar. If not, see <http://www.gnu.org/licenses/>.
****************************************************************************/
/**
* \file
* \brief Functions for handling intra frames.
*/
#include "intra.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "encoder.h"
#include "transform.h"
#include "rdo.h"
const uint8_t kvz_intra_hor_ver_dist_thres[5] = {0,7,1,0,0};
/**
* \brief Set intrablock mode (and init typedata)
* \param pic picture to use
* \param xCtb x CU position (smallest CU)
* \param yCtb y CU position (smallest CU)
* \param depth current CU depth
* \param mode mode to set
* \returns Void
*/
void kvz_intra_set_block_mode(videoframe_t *frame,uint32_t x_cu, uint32_t y_cu, uint8_t depth, uint8_t mode, uint8_t part_mode)
{
uint32_t x, y;
int block_scu_width = (LCU_WIDTH>>depth)/(LCU_WIDTH>>MAX_DEPTH);
if (part_mode == SIZE_NxN) {
cu_info_t *cur_cu = kvz_videoframe_get_cu(frame, x_cu, y_cu);
// Modes are already set.
cur_cu->depth = depth;
cur_cu->type = CU_INTRA;
cur_cu->tr_depth = depth + 1;
return;
}
// Loop through all the blocks in the area of cur_cu
for (y = y_cu; y < y_cu + block_scu_width; y++) {
for (x = x_cu; x < x_cu + block_scu_width; x++) {
cu_info_t *cur_cu = kvz_videoframe_get_cu(frame, x_cu, y_cu);
cur_cu->depth = depth;
cur_cu->type = CU_INTRA;
cur_cu->intra[0].mode = mode;
cur_cu->intra[1].mode = mode;
cur_cu->intra[2].mode = mode;
cur_cu->intra[3].mode = mode;
cur_cu->part_size = part_mode;
cur_cu->tr_depth = depth;
}
}
}
/**
* \brief get intrablock mode
* \param pic picture data to use
* \param picwidth width of the picture data
* \param xpos x-position
* \param ypos y-position
* \param width block width
* \returns DC prediction
*/
kvz_pixel kvz_intra_get_dc_pred(const kvz_pixel *pic, uint16_t picwidth, uint8_t width)
{
int32_t i, sum = 0;
// pixels on top and left
for (i = -picwidth; i < width - picwidth; i++) {
sum += pic[i];
}
for (i = -1; i < width * picwidth - 1; i += picwidth) {
sum += pic[i];
}
// return the average
return (kvz_pixel)((sum + width) / (width + width));
}
/**
* \brief Function for deriving intra luma predictions
* \param pic picture to use
* \param x_cu x CU position (smallest CU)
* \param y_cu y CU position (smallest CU)
* \param preds output buffer for 3 predictions
* \returns (predictions are found)?1:0
*/
int8_t kvz_intra_get_dir_luma_predictor(const uint32_t x, const uint32_t y, int8_t* preds,
const cu_info_t * const cur_cu, const cu_info_t * const left_cu, const cu_info_t * const above_cu)
{
int y_cu = y>>3;
// The default mode if block is not coded yet is INTRA_DC.
int8_t left_intra_dir = 1;
int8_t above_intra_dir = 1;
if (x & 4) {
// If current CU is NxN and PU is on the right half, take mode from the
// left half of the same CU.
left_intra_dir = cur_cu->intra[PU_INDEX(0, y >> 2)].mode;
} else if (left_cu && left_cu->type == CU_INTRA) {
// Otherwise take the mode from the right side of the CU on the left.
left_intra_dir = left_cu->intra[PU_INDEX(1, y >> 2)].mode;
}
if (y & 4) {
// If current CU is NxN and PU is on the bottom half, take mode from the
// top half of the same CU.
above_intra_dir = cur_cu->intra[PU_INDEX(x >> 2, 0)].mode;
} else if (above_cu && above_cu->type == CU_INTRA &&
(y_cu * (LCU_WIDTH>>MAX_DEPTH)) % LCU_WIDTH != 0)
{
// Otherwise take the mode from the bottom half of the CU above.
above_intra_dir = above_cu->intra[PU_INDEX(x >> 2, 1)].mode;
}
// If the predictions are the same, add new predictions
if (left_intra_dir == above_intra_dir) {
if (left_intra_dir > 1) { // angular modes
preds[0] = left_intra_dir;
preds[1] = ((left_intra_dir + 29) % 32) + 2;
preds[2] = ((left_intra_dir - 1 ) % 32) + 2;
} else { //non-angular
preds[0] = 0;//PLANAR_IDX;
preds[1] = 1;//DC_IDX;
preds[2] = 26;//VER_IDX;
}
} else { // If we have two distinct predictions
preds[0] = left_intra_dir;
preds[1] = above_intra_dir;
// add planar mode if it's not yet present
if (left_intra_dir && above_intra_dir ) {
preds[2] = 0; // PLANAR_IDX;
} else { // Add DC mode if it's not present, otherwise 26.
preds[2] = (left_intra_dir+above_intra_dir)<2? 26 : 1;
}
}
return 1;
}
/**
* \brief Intra filtering of the border samples
* \param ref reference picture data
* \param x_cu x CU position (smallest CU)
* \param y_cu y CU position (smallest CU)
* \param depth current CU depth
* \param preds output buffer for 3 predictions
* \returns (predictions are found)?1:0
*/
void kvz_intra_filter(kvz_pixel *ref, int32_t stride,int32_t width, int8_t mode)
{
#define FWIDTH (LCU_WIDTH*2+1)
kvz_pixel filtered[FWIDTH * FWIDTH]; //!< temporary buffer for filtered samples
kvz_pixel *filteredShift = &filtered[FWIDTH+1]; //!< pointer to temporary buffer with offset (1,1)
int x,y;
if (!mode) {
// pF[ -1 ][ -1 ] = ( p[ -1 ][ 0 ] + 2*p[ -1 ][ -1 ] + p[ 0 ][ -1 ] + 2 ) >> 2 (8 35)
filteredShift[-FWIDTH-1] = (ref[-1] + 2*ref[-(int32_t)stride-1] + ref[-(int32_t)stride] + 2) >> 2;
// pF[ -1 ][ y ] = ( p[ -1 ][ y + 1 ] + 2*p[ -1 ][ y ] + p[ -1 ][ y - 1 ] + 2 ) >> 2 for y = 0..nTbS * 2 - 2 (8 36)
for (y = 0; y < (int32_t)width * 2 - 1; y++) {
filteredShift[y*FWIDTH-1] = (ref[(y + 1) * stride - 1] + 2*ref[y * stride - 1] + ref[(y - 1) * stride - 1] + 2) >> 2;
}
// pF[ -1 ][ nTbS * 2 - 1 ] = p[ -1 ][ nTbS * 2 - 1 ] (8 37)
filteredShift[(width * 2 - 1) * FWIDTH - 1] = ref[(width * 2 - 1) * stride - 1];
// pF[ x ][ -1 ] = ( p[ x - 1 ][ -1 ] + 2*p[ x ][ -1 ] + p[ x + 1 ][ -1 ] + 2 ) >> 2 for x = 0..nTbS * 2 - 2 (8 38)
for(x = 0; x < (int32_t)width*2-1; x++) {
filteredShift[x - FWIDTH] = (ref[x - 1 - stride] + 2*ref[x - stride] + ref[x + 1 - stride] + 2) >> 2;
}
// pF[ nTbS * 2 - 1 ][ -1 ] = p[ nTbS * 2 - 1 ][ -1 ]
filteredShift[(width * 2 - 1) - FWIDTH] = ref[(width * 2 - 1) - stride];
// Copy filtered samples to the input array
for (x = -1; x < (int32_t)width * 2; x++) {
ref[x - stride] = filtered[x + 1];
}
for(y = 0; y < (int32_t)width * 2; y++) {
ref[y * stride - 1] = filtered[(y + 1) * FWIDTH];
}
} else {
printf("UNHANDLED: %s: %d\r\n", __FILE__, __LINE__);
exit(1);
}
#undef FWIDTH
}
/**
* \param rec Reference pixel. 0 points to unfiltered and 1 to filtered.
* \param recstride Stride for rec pixel arrays.
* \param dst
*/
void kvz_intra_get_pred(const encoder_control_t * const encoder, const kvz_pixel *rec, const kvz_pixel *rec_filtered, int recstride, kvz_pixel *dst, int width, int mode, int is_chroma)
{
const kvz_pixel *ref_pixels = rec;
if (is_chroma || mode == 1 || width == 4) {
// For chroma, DC and 4x4 blocks, always use unfiltered reference.
} else if (mode == 0) {
// Otherwise, use filtered for planar.
ref_pixels = rec_filtered;
} else {
// Angular modes use smoothed reference pixels, unless the mode is close
// to being either vertical or horizontal.
int filter_threshold = kvz_intra_hor_ver_dist_thres[g_to_bits[width]];
int dist_from_vert_or_hor = MIN(abs(mode - 26), abs(mode - 10));
if (dist_from_vert_or_hor > filter_threshold) {
ref_pixels = rec_filtered;
}
}
if (mode == 0) {
kvz_intra_get_planar_pred(ref_pixels, recstride, width, dst, width);
} else if (mode == 1) {
int i;
kvz_pixel val = kvz_intra_get_dc_pred(ref_pixels, recstride, width);
for (i = 0; i < width * width; i++) {
dst[i] = val;
}
// Do extra post filtering for edge pixels of luma DC mode.
if (!is_chroma && width < 32) {
kvz_intra_dc_pred_filtering(ref_pixels, recstride, dst, width, width, width);
}
} else {
int filter = !is_chroma && width < 32;
kvz_intra_get_angular_pred(encoder, ref_pixels, recstride, dst, width, width, mode, filter);
}
}
/**
* \brief Reconstruct intra block according to prediction
* \param rec reconstructed picture data
* \param recstride reconstructed picture stride
* \param width block size to predict
* \param dst destination buffer for best prediction
* \param dststride destination width
* \param mode intra mode to use
* \param chroma chroma-block flag
*/
void kvz_intra_recon(const encoder_control_t * const encoder, kvz_pixel* rec, int32_t recstride, uint32_t width, kvz_pixel* dst, int32_t dststride, int8_t mode, int8_t chroma)
{
kvz_pixel pred[LCU_WIDTH * LCU_WIDTH];
kvz_pixel rec_filtered_temp[(LCU_WIDTH * 2 + 8) * (LCU_WIDTH * 2 + 8) + 1];
kvz_pixel *recf = &rec_filtered_temp[recstride + 1];
// Generate filtered reference pixels.
{
int x, y;
for (y = -1; y < recstride; y++) {
recf[y*recstride - 1] = rec[y*recstride - 1];
}
for (x = 0; x < recstride; x++) {
recf[x - recstride] = rec[x - recstride];
}
kvz_intra_filter(recf, recstride, width, 0);
}
kvz_intra_get_pred(encoder, rec, recf, recstride, pred, width, mode, chroma);
kvz_pixels_blit(pred, dst, width, width, width, dststride);
}
/**
* \brief Build top and left borders for a reference block.
* \param pic picture to use as a source
* \param outwidth width of the prediction block
* \param chroma signaling if chroma is used, 0 = luma, 1 = U and 2 = V
*
* The end result is 2*width+8 x 2*width+8 array, with only the top and left
* edge pixels filled with the reconstructed pixels.
*/
void kvz_intra_build_reference_border(const encoder_control_t * const encoder, int32_t x_luma, int32_t y_luma, int16_t out_width,
kvz_pixel *dst, int32_t dst_stride, int8_t chroma,
int32_t pic_width, int32_t pic_height,
lcu_t *lcu)
{
// Some other function might make use of the arrays num_ref_pixels_top and
// num_ref_pixels_left in the future, but until that happens lets leave
// them here.
/**
* \brief Table for looking up the number of intra reference pixels based on
* prediction units coordinate within an LCU.
*
* This table was generated by "tools/generate_ref_pixel_tables.py".
*/
static const uint8_t num_ref_pixels_top[16][16] = {
{ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64 },
{ 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 },
{ 16, 12, 8, 4, 16, 12, 8, 4, 16, 12, 8, 4, 16, 12, 8, 4 },
{ 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 },
{ 32, 28, 24, 20, 16, 12, 8, 4, 32, 28, 24, 20, 16, 12, 8, 4 },
{ 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 },
{ 16, 12, 8, 4, 16, 12, 8, 4, 16, 12, 8, 4, 16, 12, 8, 4 },
{ 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 },
{ 64, 60, 56, 52, 48, 44, 40, 36, 32, 28, 24, 20, 16, 12, 8, 4 },
{ 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 },
{ 16, 12, 8, 4, 16, 12, 8, 4, 16, 12, 8, 4, 16, 12, 8, 4 },
{ 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 },
{ 32, 28, 24, 20, 16, 12, 8, 4, 32, 28, 24, 20, 16, 12, 8, 4 },
{ 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 },
{ 16, 12, 8, 4, 16, 12, 8, 4, 16, 12, 8, 4, 16, 12, 8, 4 },
{ 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 }
};
/**
* \brief Table for looking up the number of intra reference pixels based on
* prediction units coordinate within an LCU.
*
* This table was generated by "tools/generate_ref_pixel_tables.py".
*/
static const uint8_t num_ref_pixels_left[16][16] = {
{ 64, 4, 8, 4, 16, 4, 8, 4, 32, 4, 8, 4, 16, 4, 8, 4 },
{ 64, 4, 4, 4, 12, 4, 4, 4, 28, 4, 4, 4, 12, 4, 4, 4 },
{ 64, 4, 8, 4, 8, 4, 8, 4, 24, 4, 8, 4, 8, 4, 8, 4 },
{ 64, 4, 4, 4, 4, 4, 4, 4, 20, 4, 4, 4, 4, 4, 4, 4 },
{ 64, 4, 8, 4, 16, 4, 8, 4, 16, 4, 8, 4, 16, 4, 8, 4 },
{ 64, 4, 4, 4, 12, 4, 4, 4, 12, 4, 4, 4, 12, 4, 4, 4 },
{ 64, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 },
{ 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 },
{ 64, 4, 8, 4, 16, 4, 8, 4, 32, 4, 8, 4, 16, 4, 8, 4 },
{ 64, 4, 4, 4, 12, 4, 4, 4, 28, 4, 4, 4, 12, 4, 4, 4 },
{ 64, 4, 8, 4, 8, 4, 8, 4, 24, 4, 8, 4, 8, 4, 8, 4 },
{ 64, 4, 4, 4, 4, 4, 4, 4, 20, 4, 4, 4, 4, 4, 4, 4 },
{ 64, 4, 8, 4, 16, 4, 8, 4, 16, 4, 8, 4, 16, 4, 8, 4 },
{ 64, 4, 4, 4, 12, 4, 4, 4, 12, 4, 4, 4, 12, 4, 4, 4 },
{ 64, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 },
{ 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 }
};
const kvz_pixel dc_val = 1 << (encoder->bitdepth - 1);
const int is_chroma = chroma ? 1 : 0;
// input picture pointer
//const pixel * const src = (!chroma) ? pic->y_recdata : ((chroma == 1) ? pic->u_recdata : pic->v_recdata);
// Convert luma coordinates to chroma coordinates for chroma.
const int x = chroma ? x_luma / 2 : x_luma;
const int y = chroma ? y_luma / 2 : y_luma;
const int y_in_lcu = y_luma % LCU_WIDTH;
const int x_in_lcu = x_luma % LCU_WIDTH;
int x_local = (x_luma&0x3f)>>is_chroma, y_local = (y_luma&0x3f)>>is_chroma;
kvz_pixel *left_ref = !chroma ? &lcu->left_ref.y[1] : (chroma == 1) ? &lcu->left_ref.u[1] : &lcu->left_ref.v[1];
kvz_pixel *top_ref = !chroma ? &lcu->top_ref.y[1] : (chroma == 1) ? &lcu->top_ref.u[1] : &lcu->top_ref.v[1];
kvz_pixel *rec_ref = !chroma ? lcu->rec.y : (chroma == 1) ? lcu->rec.u : lcu->rec.v;
kvz_pixel *left_border = &left_ref[y_local];
kvz_pixel *top_border = &top_ref[x_local];
uint32_t left_stride = 1;
if(x_local) {
left_border = &rec_ref[x_local - 1 + y_local * (LCU_WIDTH>>is_chroma)];
left_stride = LCU_WIDTH>>is_chroma;
}
if(y_local) {
top_border = &rec_ref[x_local + (y_local - 1) * (LCU_WIDTH>>is_chroma)];
}
// Copy pixels for left edge.
if (x > 0) {
// Get the number of reference pixels based on the PU coordinate within the LCU.
int num_ref_pixels = num_ref_pixels_left[y_in_lcu / 4][x_in_lcu / 4] >> is_chroma;
int i;
kvz_pixel nearest_pixel;
// Max pixel we can copy from src is yy + outwidth - 1 because the dst
// extends one pixel to the left.
num_ref_pixels = MIN(num_ref_pixels, out_width - 1);
// There are no coded pixels below the frame.
num_ref_pixels = MIN(num_ref_pixels, pic_height - y);
// There are no coded pixels below the bottom of the LCU due to raster
// scan order.
num_ref_pixels = MIN(num_ref_pixels, (LCU_WIDTH - y_in_lcu) >> is_chroma);
// Copy pixels from coded CUs.
for (i = 0; i < num_ref_pixels; ++i) {
dst[(i + 1) * dst_stride] = left_border[i*left_stride];
}
// Extend the last pixel for the rest of the reference values.
nearest_pixel = dst[i * dst_stride];
for (i = num_ref_pixels; i < out_width - 1; ++i) {
dst[i * dst_stride] = nearest_pixel;
}
} else {
// If we are on the left edge, extend the first pixel of the top row.
kvz_pixel nearest_pixel = y > 0 ? top_border[0] : dc_val;
int i;
for (i = 1; i < out_width - 1; i++) {
dst[i * dst_stride] = nearest_pixel;
}
}
// Copy pixels for top edge.
if (y > 0) {
// Get the number of reference pixels based on the PU coordinate within the LCU.
int num_ref_pixels = num_ref_pixels_top[y_in_lcu / 4][x_in_lcu / 4] >> is_chroma;
int i;
kvz_pixel nearest_pixel;
// Max pixel we can copy from src is yy + outwidth - 1 because the dst
// extends one pixel to the left.
num_ref_pixels = MIN(num_ref_pixels, out_width - 1);
// All LCUs in the row above have been coded.
num_ref_pixels = MIN(num_ref_pixels, pic_width - x);
// Copy pixels from coded CUs.
for (i = 0; i < num_ref_pixels; ++i) {
dst[i + 1] = top_border[i];
}
// Extend the last pixel for the rest of the reference values.
nearest_pixel = top_border[num_ref_pixels - 1];
for (; i < out_width - 1; ++i) {
dst[i + 1] = nearest_pixel;
}
} else {
// Extend nearest pixel.
kvz_pixel nearest_pixel = x > 0 ? left_border[0] : dc_val;
int i;
for(i = 1; i < out_width; i++)
{
dst[i] = nearest_pixel;
}
}
// If top-left corner sample doesn't exist, use the sample from below.
// Unavailable samples on the left boundary are copied from below if
// available. This is the only place they are available because we don't
// support constrained intra prediction.
if (x > 0 && y > 0) {
// Make sure we always take the top-left pixel from the LCU reference
// pixel arrays if they are available.
if (x_local == 0) {
dst[0] = left_border[-1];
} else {
dst[0] = top_border[-1];
}
} else {
dst[0] = dst[dst_stride];
}
}
const int32_t kvz_ang_table[9] = {0, 2, 5, 9, 13, 17, 21, 26, 32};
const int32_t kvz_inv_ang_table[9] = {0, 4096, 1638, 910, 630, 482, 390, 315, 256}; // (256 * 32) / Angle
/**
* \brief this functions constructs the angular intra prediction from border samples
*
*/
void kvz_intra_get_angular_pred(const encoder_control_t * const encoder, const kvz_pixel* src, int32_t src_stride, kvz_pixel* dst, int32_t dst_stride, int32_t width, int32_t dir_mode, int8_t filter)
{
int32_t k,l;
int32_t blk_size = width;
// Map the mode index to main prediction direction and angle
bool mode_ver = dir_mode >= 18;
int32_t intra_pred_angle = mode_ver ? dir_mode - 26 : 10 - dir_mode;
int32_t abs_ang = abs(intra_pred_angle);
int32_t sign_ang = intra_pred_angle < 0 ? -1 : 1;
// Set bitshifts and scale the angle parameter to block size
int32_t inv_angle = kvz_inv_ang_table[abs_ang];
// Do angular predictions
kvz_pixel *ref_main;
kvz_pixel *ref_side;
kvz_pixel ref_above[2 * LCU_WIDTH + 1];
kvz_pixel ref_left[2 * LCU_WIDTH + 1];
// Tell clang-analyzer that everything is ok.
assert(width == 4 || width == 8 || width == 16 || width == 32);
abs_ang = kvz_ang_table[abs_ang];
intra_pred_angle = sign_ang * abs_ang;
// Initialise the Main and Left reference array.
if (intra_pred_angle < 0) {
int32_t invAngleSum = 128; // rounding for (shift by 8)
for (k = 0; k < blk_size + 1; k++) {
ref_above[k + blk_size - 1] = src[k - src_stride - 1];
ref_left[k + blk_size - 1] = src[(k - 1) * src_stride - 1];
}
ref_main = (mode_ver ? ref_above : ref_left) + (blk_size - 1);
ref_side = (mode_ver ? ref_left : ref_above) + (blk_size - 1);
// Extend the Main reference to the left.
for (k = -1; k > blk_size * intra_pred_angle>>5; k--) {
invAngleSum += inv_angle;
ref_main[k] = ref_side[invAngleSum>>8];
}
} else {
for (k = 0; k < 2 * blk_size + 1; k++) {
ref_above[k] = src[k - src_stride - 1];
ref_left[k] = src[(k - 1) * src_stride - 1];
}
ref_main = mode_ver ? ref_above : ref_left;
ref_side = mode_ver ? ref_left : ref_above;
}
if (intra_pred_angle == 0) {
for (k = 0; k < blk_size; k++) {
for (l = 0; l < blk_size; l++) {
dst[k * dst_stride + l] = ref_main[l + 1];
}
}
if (filter) {
for (k=0;k<blk_size;k++) {
dst[k * dst_stride] = CLIP(0, (1<<encoder->bitdepth) - 1, dst[k * dst_stride] + (( ref_side[k + 1] - ref_side[0]) >> 1));
}
}
} else {
int32_t delta_pos=0;
int32_t delta_int;
int32_t delta_fract;
int32_t minus_delta_fract;
int32_t ref_main_index;
for (k = 0; k < blk_size; k++) {
delta_pos += intra_pred_angle;
delta_int = delta_pos >> 5;
delta_fract = delta_pos & (32 - 1);
if (delta_fract) {
minus_delta_fract = (32 - delta_fract);
// Do linear filtering
for (l = 0; l < blk_size; l++) {
ref_main_index = l + delta_int + 1;
dst[k * dst_stride + l] = (kvz_pixel) ( (minus_delta_fract * ref_main[ref_main_index]
+ delta_fract * ref_main[ref_main_index + 1] + 16) >> 5);
}
} else {
// Just copy the integer samples
for (l = 0; l < blk_size; l++) {
dst[k * dst_stride + l] = ref_main[l + delta_int + 1];
}
}
}
}
// Flip the block if this is the horizontal mode
if (!mode_ver) {
kvz_pixel tmp;
for (k=0;k<blk_size-1;k++) {
for (l=k+1;l<blk_size;l++) {
tmp = dst[k * dst_stride + l];
dst[k * dst_stride + l] = dst[l * dst_stride + k];
dst[l * dst_stride + k] = tmp;
}
}
}
}
void kvz_intra_dc_pred_filtering(const kvz_pixel *src, int32_t src_stride, kvz_pixel *dst, int32_t dst_stride, int32_t width, int32_t height )
{
int32_t x, y, dst_stride2, src_stride2;
// boundary pixels processing
dst[0] = ((src[-src_stride] + src[-1] + 2 * dst[0] + 2) >> 2);
for (x = 1; x < width; x++) {
dst[x] = ((src[x - src_stride] + 3 * dst[x] + 2) >> 2);
}
for ( y = 1, dst_stride2 = dst_stride, src_stride2 = src_stride-1;
y < height; y++, dst_stride2+=dst_stride, src_stride2+=src_stride ) {
dst[dst_stride2] = ((src[src_stride2] + 3 * dst[dst_stride2] + 2) >> 2);
}
return;
}
/**
* \brief Function for deriving planar intra prediction.
* \param src source pixel array
* \param srcstride source width
* \param width block size to predict
* \param dst destination buffer for prediction
* \param dststride destination width
This function derives the prediction samples for planar mode (intra coding).
*/
void kvz_intra_get_planar_pred(const kvz_pixel* src, int32_t srcstride, uint32_t width, kvz_pixel* dst, int32_t dststride)
{
int32_t k, l, bottom_left, top_right;
int32_t hor_pred;
int32_t left_column[LCU_WIDTH+1], top_row[LCU_WIDTH+1], bottom_row[LCU_WIDTH+1], right_column[LCU_WIDTH+1];
uint32_t blk_size = width;
uint32_t offset_2d = width;
uint32_t shift_1d = kvz_g_convert_to_bit[ width ] + 2;
uint32_t shift_2d = shift_1d + 1;
// Get left and above reference column and row
for (k = 0; k < (int32_t)blk_size + 1; k++) {
top_row[k] = src[k - srcstride];
left_column[k] = src[k * srcstride - 1];
}
// Prepare intermediate variables used in interpolation
bottom_left = left_column[blk_size];
top_right = top_row[blk_size];
for (k = 0; k < (int32_t)blk_size; k++) {
bottom_row[k] = bottom_left - top_row[k];
right_column[k] = top_right - left_column[k];
top_row[k] <<= shift_1d;
left_column[k] <<= shift_1d;
}
// Generate prediction signal
for (k = 0; k < (int32_t)blk_size; k++) {
hor_pred = left_column[k] + offset_2d;
for (l = 0; l < (int32_t)blk_size; l++) {
hor_pred += right_column[k];
top_row[l] += bottom_row[l];
dst[k * dststride + l] = (kvz_pixel)((hor_pred + top_row[l]) >> shift_2d);
}
}
}
void kvz_intra_recon_lcu_luma(encoder_state_t * const state, int x, int y, int depth, int8_t intra_mode, cu_info_t *cur_cu, lcu_t *lcu)
{
const encoder_control_t * const encoder = state->encoder_control;
const vector2d_t lcu_px = { x & 0x3f, y & 0x3f };
if (cur_cu == NULL) {
cur_cu = &lcu->cu[LCU_CU_OFFSET + (lcu_px.x >> 3) + (lcu_px.y >> 3)*LCU_T_CU_WIDTH];
}
const int8_t width = LCU_WIDTH >> depth;
if (depth == 0 || cur_cu->tr_depth > depth) {
int offset = width / 2;
kvz_intra_recon_lcu_luma(state, x, y, depth+1, intra_mode, NULL, lcu);
kvz_intra_recon_lcu_luma(state, x + offset, y, depth+1, intra_mode, NULL, lcu);
kvz_intra_recon_lcu_luma(state, x, y + offset, depth+1, intra_mode, NULL, lcu);
kvz_intra_recon_lcu_luma(state, x + offset, y + offset, depth+1, intra_mode, NULL, lcu);
if (depth < MAX_DEPTH) {
cu_info_t *cu_a = &lcu->cu[LCU_CU_OFFSET + ((lcu_px.x + offset) >> 3) + (lcu_px.y >> 3) *LCU_T_CU_WIDTH];
cu_info_t *cu_b = &lcu->cu[LCU_CU_OFFSET + (lcu_px.x >> 3) + ((lcu_px.y + offset) >> 3)*LCU_T_CU_WIDTH];
cu_info_t *cu_c = &lcu->cu[LCU_CU_OFFSET + ((lcu_px.x + offset) >> 3) + ((lcu_px.y + offset) >> 3)*LCU_T_CU_WIDTH];
if (cbf_is_set(cu_a->cbf.y, depth+1) || cbf_is_set(cu_b->cbf.y, depth+1) || cbf_is_set(cu_c->cbf.y, depth+1)) {
cbf_set(&cur_cu->cbf.y, depth);
}
}
return;
}
{
const uint32_t pic_width = state->tile->frame->width;
const uint32_t pic_height = state->tile->frame->height;
// Pointers to reconstruction arrays
kvz_pixel *recbase_y = &lcu->rec.y[lcu_px.x + lcu_px.y * LCU_WIDTH];
kvz_pixel rec[(LCU_WIDTH*2+8)*(LCU_WIDTH*2+8)];
kvz_pixel *rec_shift = &rec[width * 2 + 8 + 1];
int32_t rec_stride = LCU_WIDTH;
kvz_intra_build_reference_border(encoder, x, y,(int16_t)width * 2 + 8, rec, (int16_t)width * 2 + 8, 0,
pic_width, pic_height, lcu);
kvz_intra_recon(encoder, rec_shift, width * 2 + 8,
width, recbase_y, rec_stride, intra_mode, 0);
kvz_quantize_lcu_luma_residual(state, x, y, depth, cur_cu, lcu);
}
}
void kvz_intra_recon_lcu_chroma(encoder_state_t * const state, int x, int y, int depth, int8_t intra_mode, cu_info_t *cur_cu, lcu_t *lcu)
{
const encoder_control_t * const encoder = state->encoder_control;
const vector2d_t lcu_px = { x & 0x3f, y & 0x3f };
const int8_t width = LCU_WIDTH >> depth;
const int8_t width_c = (depth == MAX_PU_DEPTH ? width : width / 2);
if (cur_cu == NULL) {
cur_cu = &lcu->cu[LCU_CU_OFFSET + (lcu_px.x >> 3) + (lcu_px.y >> 3)*LCU_T_CU_WIDTH];
}
if (depth == 0 || cur_cu->tr_depth > depth) {
int offset = width / 2;
kvz_intra_recon_lcu_chroma(state, x, y, depth+1, intra_mode, NULL, lcu);
kvz_intra_recon_lcu_chroma(state, x + offset, y, depth+1, intra_mode, NULL, lcu);
kvz_intra_recon_lcu_chroma(state, x, y + offset, depth+1, intra_mode, NULL, lcu);
kvz_intra_recon_lcu_chroma(state, x + offset, y + offset, depth+1, intra_mode, NULL, lcu);
if (depth < MAX_DEPTH) {
cu_info_t *cu_a = &lcu->cu[LCU_CU_OFFSET + ((lcu_px.x + offset) >> 3) + (lcu_px.y >> 3) *LCU_T_CU_WIDTH];
cu_info_t *cu_b = &lcu->cu[LCU_CU_OFFSET + (lcu_px.x >> 3) + ((lcu_px.y + offset) >> 3)*LCU_T_CU_WIDTH];
cu_info_t *cu_c = &lcu->cu[LCU_CU_OFFSET + ((lcu_px.x + offset) >> 3) + ((lcu_px.y + offset) >> 3)*LCU_T_CU_WIDTH];
if (cbf_is_set(cu_a->cbf.u, depth+1) || cbf_is_set(cu_b->cbf.u, depth+1) || cbf_is_set(cu_c->cbf.u, depth+1)) {
cbf_set(&cur_cu->cbf.u, depth);
}
if (cbf_is_set(cu_a->cbf.v, depth+1) || cbf_is_set(cu_b->cbf.v, depth+1) || cbf_is_set(cu_c->cbf.v, depth+1)) {
cbf_set(&cur_cu->cbf.v, depth);
}
}
return;
}
{
const uint32_t pic_width = state->tile->frame->width;
const uint32_t pic_height = state->tile->frame->height;
// Pointers to reconstruction arrays
kvz_pixel *recbase_u = &lcu->rec.u[lcu_px.x/2 + (lcu_px.y * LCU_WIDTH)/4];
kvz_pixel *recbase_v = &lcu->rec.v[lcu_px.x/2 + (lcu_px.y * LCU_WIDTH)/4];
kvz_pixel rec[(LCU_WIDTH*2+8)*(LCU_WIDTH*2+8)];
int32_t rec_stride = LCU_WIDTH;
// Reconstruct chroma.
if (!(x & 4 || y & 4)) {
kvz_pixel *rec_shift_c = &rec[width_c * 2 + 8 + 1];
kvz_intra_build_reference_border(encoder, x, y,(int16_t)width_c * 2 + 8, rec, (int16_t)width_c * 2 + 8, 1,
pic_width/2, pic_height/2, lcu);
kvz_intra_recon(encoder,
rec_shift_c,
width_c * 2 + 8,
width_c,
recbase_u,
rec_stride >> 1,
intra_mode,
1);
kvz_intra_build_reference_border(encoder, x, y,(int16_t)width_c * 2 + 8, rec, (int16_t)width_c * 2 + 8, 2,
pic_width/2, pic_height/2, lcu);
kvz_intra_recon(encoder,
rec_shift_c,
width_c * 2 + 8,
width_c,
recbase_v,
rec_stride >> 1,
intra_mode,
2);
kvz_quantize_lcu_chroma_residual(state, x, y, depth, cur_cu, lcu);
}
}
}
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