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uvg266/src/intra.c
Ari Lemmetti 62799a9fc3 Create generic strategy of planar prediction
2016-01-12 23:50:47 +02:00

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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/>.
****************************************************************************/
#include "intra.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "encoder.h"
#include "transform.h"
#include "strategies/strategies-intra.h"
#include "strategies/strategies-picture.h"
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;
}
static void intra_filter_reference(
int_fast8_t log2_width,
kvz_intra_references *refs)
{
if (refs->filtered_initialized) {
return;
} else {
refs->filtered_initialized = true;
}
const int_fast8_t ref_width = 2 * (1 << log2_width) + 1;
kvz_intra_ref *ref = &refs->ref;
kvz_intra_ref *filtered_ref = &refs->filtered_ref;
filtered_ref->left[0] = (ref->left[1] + 2 * ref->left[0] + ref->top[1] + 2) / 4;
filtered_ref->top[0] = filtered_ref->left[0];
for (int_fast8_t y = 1; y < ref_width - 1; ++y) {
kvz_pixel *p = &ref->left[y];
filtered_ref->left[y] = (p[-1] + 2 * p[0] + p[1] + 2) / 4;
}
filtered_ref->left[ref_width - 1] = ref->left[ref_width - 1];
for (int_fast8_t x = 1; x < ref_width - 1; ++x) {
kvz_pixel *p = &ref->top[x];
filtered_ref->top[x] = (p[-1] + 2 * p[0] + p[1] + 2) / 4;
}
filtered_ref->top[ref_width - 1] = ref->top[ref_width - 1];
}
static void intra_post_process_angular(
unsigned width,
unsigned stride,
const kvz_pixel *ref,
kvz_pixel *block)
{
kvz_pixel ref2 = ref[0];
for (unsigned i = 0; i < width; i++) {
kvz_pixel val = block[i * stride];
kvz_pixel ref1 = ref[i + 1];
block[i * stride] = CLIP_TO_PIXEL(val + ((ref1 - ref2) >> 1));
}
}
/**
* \brief Generage planar prediction.
* \param log2_width Log2 of width, range 2..5.
* \param in_ref_above Pointer to -1 index of above reference, length=width*2+1.
* \param in_ref_left Pointer to -1 index of left reference, length=width*2+1.
* \param dst Buffer of size width*width.
*/
static void intra_pred_dc(
const int_fast8_t log2_width,
const kvz_pixel *const ref_top,
const kvz_pixel *const ref_left,
kvz_pixel *const out_block)
{
int_fast8_t width = 1 << log2_width;
int_fast16_t sum = 0;
for (int_fast8_t i = 0; i < width; ++i) {
sum += ref_top[i + 1];
sum += ref_left[i + 1];
}
const kvz_pixel dc_val = (sum + width) >> (log2_width + 1);
const int_fast16_t block_size = 1 << (log2_width * 2);
for (int_fast16_t i = 0; i < block_size; ++i) {
out_block[i] = dc_val;
}
}
/**
* \brief Generage intra DC prediction with post filtering applied.
* \param log2_width Log2 of width, range 2..5.
* \param in_ref_above Pointer to -1 index of above reference, length=width*2+1.
* \param in_ref_left Pointer to -1 index of left reference, length=width*2+1.
* \param dst Buffer of size width*width.
*/
static void intra_pred_filtered_dc(
const int_fast8_t log2_width,
const kvz_pixel *const ref_top,
const kvz_pixel *const ref_left,
kvz_pixel *const out_block)
{
assert(log2_width >= 2 && log2_width <= 5);
const int_fast8_t width = 1 << log2_width;
int_fast16_t sum = 0;
for (int_fast8_t i = 0; i < width; ++i) {
sum += ref_top[i + 1];
sum += ref_left[i + 1];
}
const kvz_pixel dc_val = (sum + width) >> (log2_width + 1);
// Filter top-left with ([1 2 1] / 4)
out_block[0] = (ref_left[1] + 2 * dc_val + ref_top[1] + 2) / 4;
// Filter rest of the boundary with ([1 3] / 4)
for (int_fast8_t x = 1; x < width; ++x) {
out_block[x] = (ref_top[x + 1] + 3 * dc_val + 2) / 4;
}
for (int_fast8_t y = 1; y < width; ++y) {
out_block[y * width] = (ref_left[y + 1] + 3 * dc_val + 2) / 4;
for (int_fast8_t x = 1; x < width; ++x) {
out_block[y * width + x] = dc_val;
}
}
}
void kvz_intra_predict(
kvz_intra_references *refs,
int_fast8_t log2_width,
int_fast8_t mode,
color_t color,
kvz_pixel *dst)
{
const int_fast8_t width = 1 << log2_width;
const kvz_intra_ref *used_ref = &refs->ref;
if (color != COLOR_Y || mode == 1 || width == 4) {
// For chroma, DC and 4x4 blocks, always use unfiltered reference.
} else if (mode == 0) {
// Otherwise, use filtered for planar.
used_ref = &refs->filtered_ref;
} else {
// Angular modes use smoothed reference pixels, unless the mode is close
// to being either vertical or horizontal.
static const int kvz_intra_hor_ver_dist_thres[5] = { 0, 7, 1, 0, 0 };
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) {
used_ref = &refs->filtered_ref;
}
}
if (used_ref == &refs->filtered_ref && !refs->filtered_initialized) {
intra_filter_reference(log2_width, refs);
}
if (mode == 0) {
kvz_intra_pred_planar(log2_width, used_ref->top, used_ref->left, dst);
} else if (mode == 1) {
// Do extra post filtering for edge pixels of luma DC mode.
if (color == COLOR_Y && width < 32) {
intra_pred_filtered_dc(log2_width, used_ref->top, used_ref->left, dst);
} else {
intra_pred_dc(log2_width, used_ref->top, used_ref->left, dst);
}
} else {
kvz_angular_pred(log2_width, mode, used_ref->top, used_ref->left, dst);
if (color == COLOR_Y && width < 32) {
if (mode == 10) {
intra_post_process_angular(width, 1, used_ref->top, dst);
} else if (mode == 26) {
intra_post_process_angular(width, width, used_ref->left, dst);
}
}
}
}
void kvz_intra_build_reference(
const int_fast8_t log2_width,
const color_t color,
const vector2d_t *const luma_px,
const vector2d_t *const pic_px,
const lcu_t *const lcu,
kvz_intra_references *const refs)
{
assert(log2_width >= 2 && log2_width <= 5);
// Tables for looking up the number of intra reference pixels based on
// prediction units coordinate within an LCU.
// 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 }
};
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 },
{ 60, 4, 4, 4, 12, 4, 4, 4, 28, 4, 4, 4, 12, 4, 4, 4 },
{ 56, 4, 8, 4, 8, 4, 8, 4, 24, 4, 8, 4, 8, 4, 8, 4 },
{ 52, 4, 4, 4, 4, 4, 4, 4, 20, 4, 4, 4, 4, 4, 4, 4 },
{ 48, 4, 8, 4, 16, 4, 8, 4, 16, 4, 8, 4, 16, 4, 8, 4 },
{ 44, 4, 4, 4, 12, 4, 4, 4, 12, 4, 4, 4, 12, 4, 4, 4 },
{ 40, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 },
{ 36, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 },
{ 32, 4, 8, 4, 16, 4, 8, 4, 32, 4, 8, 4, 16, 4, 8, 4 },
{ 28, 4, 4, 4, 12, 4, 4, 4, 28, 4, 4, 4, 12, 4, 4, 4 },
{ 24, 4, 8, 4, 8, 4, 8, 4, 24, 4, 8, 4, 8, 4, 8, 4 },
{ 20, 4, 4, 4, 4, 4, 4, 4, 20, 4, 4, 4, 4, 4, 4, 4 },
{ 16, 4, 8, 4, 16, 4, 8, 4, 16, 4, 8, 4, 16, 4, 8, 4 },
{ 12, 4, 4, 4, 12, 4, 4, 4, 12, 4, 4, 4, 12, 4, 4, 4 },
{ 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 },
{ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 }
};
refs->filtered_initialized = false;
kvz_pixel *out_left_ref = &refs->ref.left[0];
kvz_pixel *out_top_ref = &refs->ref.top[0];
const kvz_pixel dc_val = 1 << (KVZ_BIT_DEPTH - 1);
const int is_chroma = color != COLOR_Y ? 1 : 0;
const int_fast8_t width = 1 << log2_width;
// Convert luma coordinates to chroma coordinates for chroma.
const vector2d_t lcu_px = {
luma_px->x % LCU_WIDTH,
luma_px->y % LCU_WIDTH
};
const vector2d_t px = {
lcu_px.x >> is_chroma,
lcu_px.y >> is_chroma,
};
// Init pointers to LCUs reconstruction buffers, such that index 0 refers to block coordinate 0.
const kvz_pixel *left_ref = !color ? &lcu->left_ref.y[1] : (color == 1) ? &lcu->left_ref.u[1] : &lcu->left_ref.v[1];
const kvz_pixel *top_ref = !color ? &lcu->top_ref.y[1] : (color == 1) ? &lcu->top_ref.u[1] : &lcu->top_ref.v[1];
const kvz_pixel *rec_ref = !color ? lcu->rec.y : (color == 1) ? lcu->rec.u : lcu->rec.v;
// Init top borders pointer to point to the correct place in the correct reference array.
const kvz_pixel *top_border;
if (px.y) {
top_border = &rec_ref[px.x + (px.y - 1) * (LCU_WIDTH >> is_chroma)];
} else {
top_border = &top_ref[px.x];
}
// Init left borders pointer to point to the correct place in the correct reference array.
const kvz_pixel *left_border;
int left_stride; // Distance between reference samples.
if (px.x) {
left_border = &rec_ref[px.x - 1 + px.y * (LCU_WIDTH >> is_chroma)];
left_stride = LCU_WIDTH >> is_chroma;
} else {
left_border = &left_ref[px.y];
left_stride = 1;
}
// Generate left reference.
if (luma_px->x > 0) {
// Get the number of reference pixels based on the PU coordinate within the LCU.
int px_available_left = num_ref_pixels_left[lcu_px.y / 4][lcu_px.x / 4] >> is_chroma;
// Limit the number of available pixels based on block size and dimensions
// of the picture.
px_available_left = MIN(px_available_left, width * 2);
px_available_left = MIN(px_available_left, (pic_px->y - luma_px->y) >> is_chroma);
// Copy pixels from coded CUs.
for (int i = 0; i < px_available_left; ++i) {
out_left_ref[i + 1] = left_border[i * left_stride];
}
// Extend the last pixel for the rest of the reference values.
kvz_pixel nearest_pixel = out_left_ref[px_available_left];
for (int i = px_available_left; i < width * 2; ++i) {
out_left_ref[i + 1] = nearest_pixel;
}
} else {
// If we are on the left edge, extend the first pixel of the top row.
kvz_pixel nearest_pixel = luma_px->y > 0 ? top_border[0] : dc_val;
for (int i = 0; i < width * 2; i++) {
out_left_ref[i + 1] = nearest_pixel;
}
}
// Generate top-left reference.
if (luma_px->x > 0 && luma_px->y > 0) {
// If the block is at an LCU border, the top-left must be copied from
// the border that points to the LCUs 1D reference buffer.
if (px.x == 0) {
out_left_ref[0] = left_border[-1 * left_stride];
out_top_ref[0] = left_border[-1 * left_stride];
} else {
out_left_ref[0] = top_border[-1];
out_top_ref[0] = top_border[-1];
}
} else {
// Copy reference clockwise.
out_left_ref[0] = out_left_ref[1];
out_top_ref[0] = out_left_ref[1];
}
// Generate top reference.
if (luma_px->y > 0) {
// Get the number of reference pixels based on the PU coordinate within the LCU.
int px_available_top = num_ref_pixels_top[lcu_px.y / 4][lcu_px.x / 4] >> is_chroma;
// Limit the number of available pixels based on block size and dimensions
// of the picture.
px_available_top = MIN(px_available_top, width * 2);
px_available_top = MIN(px_available_top, (pic_px->x - luma_px->x) >> is_chroma);
// Copy all the pixels we can.
for (int i = 0; i < px_available_top; ++i) {
out_top_ref[i + 1] = top_border[i];
}
// Extend the last pixel for the rest of the reference values.
kvz_pixel nearest_pixel = top_border[px_available_top - 1];
for (int i = px_available_top; i < width * 2; ++i) {
out_top_ref[i + 1] = nearest_pixel;
}
} else {
// Extend nearest pixel.
kvz_pixel nearest_pixel = luma_px->x > 0 ? left_border[0] : dc_val;
for (int i = 0; i < width * 2; i++) {
out_top_ref[i + 1] = nearest_pixel;
}
}
}
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 vector2d_t lcu_px = { SUB_SCU(x), SUB_SCU(y) };
if (cur_cu == NULL) {
cur_cu = LCU_GET_CU_AT_PX(lcu, lcu_px.x, lcu_px.y);
}
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_GET_CU_AT_PX(lcu, lcu_px.x + offset, lcu_px.y);
cu_info_t *cu_b = LCU_GET_CU_AT_PX(lcu, lcu_px.x, lcu_px.y + offset);
cu_info_t *cu_c = LCU_GET_CU_AT_PX(lcu, lcu_px.x + offset, lcu_px.y + offset);
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;
}
// Perform intra prediction and put the result in correct place lcu.
vector2d_t pic_px = { state->tile->frame->width, state->tile->frame->height };
vector2d_t luma_px = { x, y };
kvz_intra_references refs;
const int_fast8_t log2_width = kvz_g_convert_to_bit[width] + 2;
kvz_intra_build_reference(log2_width, COLOR_Y, &luma_px, &pic_px, lcu, &refs);
kvz_pixel pred[32 * 32];
kvz_intra_predict(&refs, log2_width, intra_mode, COLOR_Y, pred);
kvz_pixel *block_in_lcu = &lcu->rec.y[lcu_px.x + lcu_px.y * LCU_WIDTH];
kvz_pixels_blit(pred, block_in_lcu, width, width, width, LCU_WIDTH);
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 vector2d_t lcu_px = { SUB_SCU(x), SUB_SCU(y) };
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_GET_CU_AT_PX(lcu, lcu_px.x, lcu_px.y);
}
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_GET_CU_AT_PX(lcu, lcu_px.x + offset, lcu_px.y);
cu_info_t *cu_b = LCU_GET_CU_AT_PX(lcu, lcu_px.x, lcu_px.y + offset);
cu_info_t *cu_c = LCU_GET_CU_AT_PX(lcu, lcu_px.x + offset, lcu_px.y + offset);
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;
}
if (!(x & 4 || y & 4)) {
const int_fast8_t log2_width_c = kvz_g_convert_to_bit[width_c] + 2;
const vector2d_t luma_px = { x, y };
const vector2d_t pic_px = { state->tile->frame->width, state->tile->frame->height };
// Intra predict U-plane and put the result in lcu buffer.
{
kvz_intra_references refs;
kvz_intra_build_reference(log2_width_c, COLOR_U, &luma_px, &pic_px, lcu, &refs);
kvz_pixel pred[32 * 32];
kvz_intra_predict(&refs, log2_width_c, intra_mode, COLOR_U, pred);
kvz_pixel *pu_in_lcu = &lcu->rec.u[lcu_px.x / 2 + (lcu_px.y * LCU_WIDTH) / 4];
kvz_pixels_blit(pred, pu_in_lcu, width_c, width_c, width_c, LCU_WIDTH_C);
}
// Intra predict V-plane and put the result in lcu buffer.
{
kvz_intra_references refs;
kvz_intra_build_reference(log2_width_c, COLOR_V, &luma_px, &pic_px, lcu, &refs);
kvz_pixel pred[32 * 32];
kvz_intra_predict(&refs, log2_width_c, intra_mode, COLOR_V, pred);
kvz_pixel *pu_in_lcu = &lcu->rec.v[lcu_px.x / 2 + (lcu_px.y * LCU_WIDTH) / 4];
kvz_pixels_blit(pred, pu_in_lcu, width_c, width_c, width_c, LCU_WIDTH_C);
}
kvz_quantize_lcu_chroma_residual(state, x, y, depth, cur_cu, lcu);
}
}
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