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/*
* Copyright (c) 2021, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 3-Clause Clear License
* and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
* License was not distributed with this source code in the LICENSE file, you
* can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. If the
* Alliance for Open Media Patent License 1.0 was not distributed with this
* source code in the PATENTS file, you can obtain it at
* aomedia.org/license/patent-license/.
*/
#include <assert.h>
#include "config/av1_rtcd.h"
#include "av1/encoder/block.h"
#include "av1/encoder/hash.h"
#include "av1/encoder/hash_motion.h"
#define kSrcBits 16
#define kBlockSizeBits 3
#define kMaxAddr (1 << (kSrcBits + kBlockSizeBits))
static void get_pixels_in_1D_short_array_by_block_2x2(const uint16_t *y_src,
int stride,
uint16_t *p_pixels_in1D) {
const uint16_t *p_pel = y_src;
int index = 0;
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
p_pixels_in1D[index++] = p_pel[j];
}
p_pel += stride;
}
}
static int is_block16_2x2_row_same_value(const uint16_t *p) {
if (p[0] != p[1] || p[2] != p[3]) {
return 0;
}
return 1;
}
static int is_block16_2x2_col_same_value(const uint16_t *p) {
if ((p[0] != p[2]) || (p[1] != p[3])) {
return 0;
}
return 1;
}
// the hash value (hash_value1 consists two parts, the first 3 bits relate to
// the block size and the remaining 16 bits are the crc values. This function
// is used to get the first 3 bits.
static int hash_block_size_to_index(int block_size) {
switch (block_size) {
case 4: return 0;
case 8: return 1;
case 16: return 2;
case 32: return 3;
case 64: return 4;
case 128: return 5;
#if CONFIG_BLOCK_256
case 256: return 6;
#endif // CONFIG_BLOCK_256
default: return -1;
}
}
void av1_hash_table_init(IntraBCHashInfo *intrabc_hash_info) {
if (!intrabc_hash_info->g_crc_initialized) {
av1_crc_calculator_init(&intrabc_hash_info->crc_calculator1, 24, 0x5D6DCB);
av1_crc_calculator_init(&intrabc_hash_info->crc_calculator2, 24, 0x864CFB);
intrabc_hash_info->g_crc_initialized = 1;
}
intrabc_hash_info->intrabc_hash_table.p_lookup_table = NULL;
}
void av1_hash_table_clear_all(hash_table *p_hash_table) {
if (p_hash_table->p_lookup_table == NULL) {
return;
}
for (int i = 0; i < kMaxAddr; i++) {
if (p_hash_table->p_lookup_table[i] != NULL) {
aom_vector_destroy(p_hash_table->p_lookup_table[i]);
aom_free(p_hash_table->p_lookup_table[i]);
p_hash_table->p_lookup_table[i] = NULL;
}
}
}
void av1_hash_table_destroy(hash_table *p_hash_table) {
av1_hash_table_clear_all(p_hash_table);
aom_free(p_hash_table->p_lookup_table);
p_hash_table->p_lookup_table = NULL;
}
void av1_hash_table_create(hash_table *p_hash_table) {
if (p_hash_table->p_lookup_table != NULL) {
av1_hash_table_clear_all(p_hash_table);
return;
}
p_hash_table->p_lookup_table =
(Vector **)aom_malloc(sizeof(p_hash_table->p_lookup_table[0]) * kMaxAddr);
memset(p_hash_table->p_lookup_table, 0,
sizeof(p_hash_table->p_lookup_table[0]) * kMaxAddr);
}
static void hash_table_add_to_table(hash_table *p_hash_table,
uint32_t hash_value,
block_hash *curr_block_hash) {
if (p_hash_table->p_lookup_table[hash_value] == NULL) {
p_hash_table->p_lookup_table[hash_value] =
aom_malloc(sizeof(p_hash_table->p_lookup_table[0][0]));
aom_vector_setup(p_hash_table->p_lookup_table[hash_value], 10,
sizeof(curr_block_hash[0]));
aom_vector_push_back(p_hash_table->p_lookup_table[hash_value],
curr_block_hash);
} else {
aom_vector_push_back(p_hash_table->p_lookup_table[hash_value],
curr_block_hash);
}
}
int32_t av1_hash_table_count(const hash_table *p_hash_table,
uint32_t hash_value) {
if (p_hash_table->p_lookup_table[hash_value] == NULL) {
return 0;
} else {
return (int32_t)(p_hash_table->p_lookup_table[hash_value]->size);
}
}
Iterator av1_hash_get_first_iterator(hash_table *p_hash_table,
uint32_t hash_value) {
assert(av1_hash_table_count(p_hash_table, hash_value) > 0);
return aom_vector_begin(p_hash_table->p_lookup_table[hash_value]);
}
int32_t av1_has_exact_match(hash_table *p_hash_table, uint32_t hash_value1,
uint32_t hash_value2) {
if (p_hash_table->p_lookup_table[hash_value1] == NULL) {
return 0;
}
Iterator iterator =
aom_vector_begin(p_hash_table->p_lookup_table[hash_value1]);
Iterator last = aom_vector_end(p_hash_table->p_lookup_table[hash_value1]);
for (; !aom_iterator_equals(&iterator, &last);
aom_iterator_increment(&iterator)) {
if ((*(block_hash *)aom_iterator_get(&iterator)).hash_value2 ==
hash_value2) {
return 1;
}
}
return 0;
}
void av1_generate_block_2x2_hash_value(IntraBCHashInfo *intrabc_hash_info,
const YV12_BUFFER_CONFIG *picture,
uint32_t *pic_block_hash[2],
int8_t *pic_block_same_info[3]) {
const int width = 2;
const int height = 2;
const int x_end = picture->y_crop_width - width + 1;
const int y_end = picture->y_crop_height - height + 1;
CRC_CALCULATOR *calc_1 = &intrabc_hash_info->crc_calculator1;
CRC_CALCULATOR *calc_2 = &intrabc_hash_info->crc_calculator2;
const int length = width * 2;
uint16_t p[4];
int pos = 0;
for (int y_pos = 0; y_pos < y_end; y_pos++) {
for (int x_pos = 0; x_pos < x_end; x_pos++) {
get_pixels_in_1D_short_array_by_block_2x2(
picture->y_buffer + y_pos * picture->y_stride + x_pos,
picture->y_stride, p);
pic_block_same_info[0][pos] = is_block16_2x2_row_same_value(p);
pic_block_same_info[1][pos] = is_block16_2x2_col_same_value(p);
pic_block_hash[0][pos] =
av1_get_crc_value(calc_1, (uint8_t *)p, length * sizeof(p[0]));
pic_block_hash[1][pos] =
av1_get_crc_value(calc_2, (uint8_t *)p, length * sizeof(p[0]));
pos++;
}
pos += width - 1;
}
}
void av1_generate_block_hash_value(IntraBCHashInfo *intrabc_hash_info,
const YV12_BUFFER_CONFIG *picture,
int block_size,
uint32_t *src_pic_block_hash[2],
uint32_t *dst_pic_block_hash[2],
int8_t *src_pic_block_same_info[3],
int8_t *dst_pic_block_same_info[3]) {
CRC_CALCULATOR *calc_1 = &intrabc_hash_info->crc_calculator1;
CRC_CALCULATOR *calc_2 = &intrabc_hash_info->crc_calculator2;
const int pic_width = picture->y_crop_width;
const int x_end = picture->y_crop_width - block_size + 1;
const int y_end = picture->y_crop_height - block_size + 1;
const int src_size = block_size >> 1;
const int quad_size = block_size >> 2;
uint32_t p[4];
const int length = sizeof(p);
int pos = 0;
for (int y_pos = 0; y_pos < y_end; y_pos++) {
for (int x_pos = 0; x_pos < x_end; x_pos++) {
p[0] = src_pic_block_hash[0][pos];
p[1] = src_pic_block_hash[0][pos + src_size];
p[2] = src_pic_block_hash[0][pos + src_size * pic_width];
p[3] = src_pic_block_hash[0][pos + src_size * pic_width + src_size];
dst_pic_block_hash[0][pos] =
av1_get_crc_value(calc_1, (uint8_t *)p, length);
p[0] = src_pic_block_hash[1][pos];
p[1] = src_pic_block_hash[1][pos + src_size];
p[2] = src_pic_block_hash[1][pos + src_size * pic_width];
p[3] = src_pic_block_hash[1][pos + src_size * pic_width + src_size];
dst_pic_block_hash[1][pos] =
av1_get_crc_value(calc_2, (uint8_t *)p, length);
dst_pic_block_same_info[0][pos] =
src_pic_block_same_info[0][pos] &&
src_pic_block_same_info[0][pos + quad_size] &&
src_pic_block_same_info[0][pos + src_size] &&
src_pic_block_same_info[0][pos + src_size * pic_width] &&
src_pic_block_same_info[0][pos + src_size * pic_width + quad_size] &&
src_pic_block_same_info[0][pos + src_size * pic_width + src_size];
dst_pic_block_same_info[1][pos] =
src_pic_block_same_info[1][pos] &&
src_pic_block_same_info[1][pos + src_size] &&
src_pic_block_same_info[1][pos + quad_size * pic_width] &&
src_pic_block_same_info[1][pos + quad_size * pic_width + src_size] &&
src_pic_block_same_info[1][pos + src_size * pic_width] &&
src_pic_block_same_info[1][pos + src_size * pic_width + src_size];
pos++;
}
pos += block_size - 1;
}
if (block_size >= 4) {
const int size_minus_1 = block_size - 1;
pos = 0;
for (int y_pos = 0; y_pos < y_end; y_pos++) {
for (int x_pos = 0; x_pos < x_end; x_pos++) {
dst_pic_block_same_info[2][pos] =
(!dst_pic_block_same_info[0][pos] &&
!dst_pic_block_same_info[1][pos]) ||
(((x_pos & size_minus_1) == 0) && ((y_pos & size_minus_1) == 0));
pos++;
}
pos += block_size - 1;
}
}
}
void av1_add_to_hash_map_by_row_with_precal_data(hash_table *p_hash_table,
uint32_t *pic_hash[2],
int8_t *pic_is_same,
int pic_width, int pic_height,
int block_size) {
const int x_end = pic_width - block_size + 1;
const int y_end = pic_height - block_size + 1;
const int8_t *src_is_added = pic_is_same;
const uint32_t *src_hash[2] = { pic_hash[0], pic_hash[1] };
int add_value = hash_block_size_to_index(block_size);
assert(add_value >= 0);
add_value <<= kSrcBits;
const int crc_mask = (1 << kSrcBits) - 1;
for (int x_pos = 0; x_pos < x_end; x_pos++) {
for (int y_pos = 0; y_pos < y_end; y_pos++) {
const int pos = y_pos * pic_width + x_pos;
// valid data
if (src_is_added[pos]) {
block_hash curr_block_hash;
curr_block_hash.x = x_pos;
curr_block_hash.y = y_pos;
const uint32_t hash_value1 = (src_hash[0][pos] & crc_mask) + add_value;
curr_block_hash.hash_value2 = src_hash[1][pos];
hash_table_add_to_table(p_hash_table, hash_value1, &curr_block_hash);
}
}
}
}
int av1_hash_is_horizontal_perfect(const YV12_BUFFER_CONFIG *picture,
int block_size, int x_start, int y_start) {
const int stride = picture->y_stride;
const uint16_t *p = picture->y_buffer + y_start * stride + x_start;
for (int i = 0; i < block_size; i++) {
for (int j = 1; j < block_size; j++) {
if (p[j] != p[0]) {
return 0;
}
}
p += stride;
}
return 1;
}
int av1_hash_is_vertical_perfect(const YV12_BUFFER_CONFIG *picture,
int block_size, int x_start, int y_start) {
const int stride = picture->y_stride;
const uint16_t *p = picture->y_buffer + y_start * stride + x_start;
for (int i = 0; i < block_size; i++) {
for (int j = 1; j < block_size; j++) {
if (p[j * stride + i] != p[i]) {
return 0;
}
}
}
return 1;
}
void av1_get_block_hash_value(IntraBCHashInfo *intrabc_hash_info,
const uint16_t *y_src, int stride, int block_size,
uint32_t *hash_value1, uint32_t *hash_value2) {
int add_value = hash_block_size_to_index(block_size);
assert(add_value >= 0);
add_value <<= kSrcBits;
const int crc_mask = (1 << kSrcBits) - 1;
CRC_CALCULATOR *calc_1 = &intrabc_hash_info->crc_calculator1;
CRC_CALCULATOR *calc_2 = &intrabc_hash_info->crc_calculator2;
uint32_t **buf_1 = intrabc_hash_info->hash_value_buffer[0];
uint32_t **buf_2 = intrabc_hash_info->hash_value_buffer[1];
// 2x2 subblock hash values in current CU
int sub_block_in_width = (block_size >> 1);
uint16_t pixel_to_hash[4];
for (int y_pos = 0; y_pos < block_size; y_pos += 2) {
for (int x_pos = 0; x_pos < block_size; x_pos += 2) {
int pos = (y_pos >> 1) * sub_block_in_width + (x_pos >> 1);
get_pixels_in_1D_short_array_by_block_2x2(y_src + y_pos * stride + x_pos,
stride, pixel_to_hash);
assert(pos < AOM_BUFFER_SIZE_FOR_BLOCK_HASH);
buf_1[0][pos] = av1_get_crc_value(calc_1, (uint8_t *)pixel_to_hash,
sizeof(pixel_to_hash));
buf_2[0][pos] = av1_get_crc_value(calc_2, (uint8_t *)pixel_to_hash,
sizeof(pixel_to_hash));
}
}
int src_sub_block_in_width = sub_block_in_width;
sub_block_in_width >>= 1;
int src_idx = 1;
int dst_idx = 0;
// 4x4 subblock hash values to current block hash values
uint32_t to_hash[4];
for (int sub_width = 4; sub_width <= block_size; sub_width *= 2) {
src_idx = 1 - src_idx;
dst_idx = 1 - dst_idx;
int dst_pos = 0;
for (int y_pos = 0; y_pos < sub_block_in_width; y_pos++) {
for (int x_pos = 0; x_pos < sub_block_in_width; x_pos++) {
int srcPos = (y_pos << 1) * src_sub_block_in_width + (x_pos << 1);
assert(srcPos + 1 < AOM_BUFFER_SIZE_FOR_BLOCK_HASH);
assert(srcPos + src_sub_block_in_width + 1 <
AOM_BUFFER_SIZE_FOR_BLOCK_HASH);
assert(dst_pos < AOM_BUFFER_SIZE_FOR_BLOCK_HASH);
to_hash[0] = buf_1[src_idx][srcPos];
to_hash[1] = buf_1[src_idx][srcPos + 1];
to_hash[2] = buf_1[src_idx][srcPos + src_sub_block_in_width];
to_hash[3] = buf_1[src_idx][srcPos + src_sub_block_in_width + 1];
buf_1[dst_idx][dst_pos] =
av1_get_crc_value(calc_1, (uint8_t *)to_hash, sizeof(to_hash));
to_hash[0] = buf_2[src_idx][srcPos];
to_hash[1] = buf_2[src_idx][srcPos + 1];
to_hash[2] = buf_2[src_idx][srcPos + src_sub_block_in_width];
to_hash[3] = buf_2[src_idx][srcPos + src_sub_block_in_width + 1];
buf_2[dst_idx][dst_pos] =
av1_get_crc_value(calc_2, (uint8_t *)to_hash, sizeof(to_hash));
dst_pos++;
}
}
src_sub_block_in_width = sub_block_in_width;
sub_block_in_width >>= 1;
}
*hash_value1 = (buf_1[dst_idx][0] & crc_mask) + add_value;
*hash_value2 = buf_2[dst_idx][0];
}