1 /*
2 * Copyright (c) 2018, Alliance for Open Media. All rights reserved.
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 #include <assert.h>
13 #include <stdbool.h>
14
15 #include "config/av1_rtcd.h"
16
17 #include "av1/encoder/block.h"
18 #include "av1/encoder/hash.h"
19 #include "av1/encoder/hash_motion.h"
20
21 #define kSrcBits 16
22 #define kBlockSizeBits 3
23 #define kMaxAddr (1 << (kSrcBits + kBlockSizeBits))
24
25 // TODO([email protected]): is higher than 8 bits screen content supported?
26 // If yes, fix this function
get_pixels_in_1D_char_array_by_block_2x2(const uint8_t * y_src,int stride,uint8_t * p_pixels_in1D)27 static void get_pixels_in_1D_char_array_by_block_2x2(const uint8_t *y_src,
28 int stride,
29 uint8_t *p_pixels_in1D) {
30 const uint8_t *p_pel = y_src;
31 int index = 0;
32 for (int i = 0; i < 2; i++) {
33 for (int j = 0; j < 2; j++) {
34 p_pixels_in1D[index++] = p_pel[j];
35 }
36 p_pel += stride;
37 }
38 }
39
get_pixels_in_1D_short_array_by_block_2x2(const uint16_t * y_src,int stride,uint16_t * p_pixels_in1D)40 static void get_pixels_in_1D_short_array_by_block_2x2(const uint16_t *y_src,
41 int stride,
42 uint16_t *p_pixels_in1D) {
43 const uint16_t *p_pel = y_src;
44 int index = 0;
45 for (int i = 0; i < 2; i++) {
46 for (int j = 0; j < 2; j++) {
47 p_pixels_in1D[index++] = p_pel[j];
48 }
49 p_pel += stride;
50 }
51 }
52
is_block_2x2_row_same_value(const uint8_t * p)53 static int is_block_2x2_row_same_value(const uint8_t *p) {
54 if (p[0] != p[1] || p[2] != p[3]) {
55 return 0;
56 }
57 return 1;
58 }
59
is_block16_2x2_row_same_value(const uint16_t * p)60 static int is_block16_2x2_row_same_value(const uint16_t *p) {
61 if (p[0] != p[1] || p[2] != p[3]) {
62 return 0;
63 }
64 return 1;
65 }
66
is_block_2x2_col_same_value(const uint8_t * p)67 static int is_block_2x2_col_same_value(const uint8_t *p) {
68 if ((p[0] != p[2]) || (p[1] != p[3])) {
69 return 0;
70 }
71 return 1;
72 }
73
is_block16_2x2_col_same_value(const uint16_t * p)74 static int is_block16_2x2_col_same_value(const uint16_t *p) {
75 if ((p[0] != p[2]) || (p[1] != p[3])) {
76 return 0;
77 }
78 return 1;
79 }
80
81 // the hash value (hash_value1 consists two parts, the first 3 bits relate to
82 // the block size and the remaining 16 bits are the crc values. This fuction
83 // is used to get the first 3 bits.
hash_block_size_to_index(int block_size)84 static int hash_block_size_to_index(int block_size) {
85 switch (block_size) {
86 case 4: return 0;
87 case 8: return 1;
88 case 16: return 2;
89 case 32: return 3;
90 case 64: return 4;
91 case 128: return 5;
92 default: return -1;
93 }
94 }
95
av1_hash_table_init(IntraBCHashInfo * intrabc_hash_info)96 void av1_hash_table_init(IntraBCHashInfo *intrabc_hash_info) {
97 if (!intrabc_hash_info->g_crc_initialized) {
98 av1_crc_calculator_init(&intrabc_hash_info->crc_calculator1, 24, 0x5D6DCB);
99 av1_crc_calculator_init(&intrabc_hash_info->crc_calculator2, 24, 0x864CFB);
100 intrabc_hash_info->g_crc_initialized = 1;
101 }
102 intrabc_hash_info->intrabc_hash_table.p_lookup_table = NULL;
103 }
104
clear_all(hash_table * p_hash_table)105 static void clear_all(hash_table *p_hash_table) {
106 if (p_hash_table->p_lookup_table == NULL) {
107 return;
108 }
109 for (int i = 0; i < kMaxAddr; i++) {
110 if (p_hash_table->p_lookup_table[i] != NULL) {
111 aom_vector_destroy(p_hash_table->p_lookup_table[i]);
112 aom_free(p_hash_table->p_lookup_table[i]);
113 p_hash_table->p_lookup_table[i] = NULL;
114 }
115 }
116 }
117
av1_hash_table_destroy(hash_table * p_hash_table)118 void av1_hash_table_destroy(hash_table *p_hash_table) {
119 clear_all(p_hash_table);
120 aom_free(p_hash_table->p_lookup_table);
121 p_hash_table->p_lookup_table = NULL;
122 }
123
av1_hash_table_create(hash_table * p_hash_table)124 bool av1_hash_table_create(hash_table *p_hash_table) {
125 if (p_hash_table->p_lookup_table != NULL) {
126 clear_all(p_hash_table);
127 return true;
128 }
129 p_hash_table->p_lookup_table =
130 (Vector **)aom_calloc(kMaxAddr, sizeof(p_hash_table->p_lookup_table[0]));
131 if (!p_hash_table->p_lookup_table) return false;
132 return true;
133 }
134
hash_table_add_to_table(hash_table * p_hash_table,uint32_t hash_value,block_hash * curr_block_hash)135 static bool hash_table_add_to_table(hash_table *p_hash_table,
136 uint32_t hash_value,
137 block_hash *curr_block_hash) {
138 if (p_hash_table->p_lookup_table[hash_value] == NULL) {
139 p_hash_table->p_lookup_table[hash_value] =
140 aom_malloc(sizeof(p_hash_table->p_lookup_table[0][0]));
141 if (p_hash_table->p_lookup_table[hash_value] == NULL) {
142 return false;
143 }
144 if (aom_vector_setup(p_hash_table->p_lookup_table[hash_value], 10,
145 sizeof(curr_block_hash[0])) == VECTOR_ERROR)
146 return false;
147 if (aom_vector_push_back(p_hash_table->p_lookup_table[hash_value],
148 curr_block_hash) == VECTOR_ERROR)
149 return false;
150 } else {
151 if (aom_vector_push_back(p_hash_table->p_lookup_table[hash_value],
152 curr_block_hash) == VECTOR_ERROR)
153 return false;
154 }
155 return true;
156 }
157
av1_hash_table_count(const hash_table * p_hash_table,uint32_t hash_value)158 int32_t av1_hash_table_count(const hash_table *p_hash_table,
159 uint32_t hash_value) {
160 if (p_hash_table->p_lookup_table[hash_value] == NULL) {
161 return 0;
162 } else {
163 return (int32_t)(p_hash_table->p_lookup_table[hash_value]->size);
164 }
165 }
166
av1_hash_get_first_iterator(hash_table * p_hash_table,uint32_t hash_value)167 Iterator av1_hash_get_first_iterator(hash_table *p_hash_table,
168 uint32_t hash_value) {
169 assert(av1_hash_table_count(p_hash_table, hash_value) > 0);
170 return aom_vector_begin(p_hash_table->p_lookup_table[hash_value]);
171 }
172
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])173 void av1_generate_block_2x2_hash_value(IntraBCHashInfo *intrabc_hash_info,
174 const YV12_BUFFER_CONFIG *picture,
175 uint32_t *pic_block_hash[2],
176 int8_t *pic_block_same_info[3]) {
177 const int width = 2;
178 const int height = 2;
179 const int x_end = picture->y_crop_width - width + 1;
180 const int y_end = picture->y_crop_height - height + 1;
181 CRC_CALCULATOR *calc_1 = &intrabc_hash_info->crc_calculator1;
182 CRC_CALCULATOR *calc_2 = &intrabc_hash_info->crc_calculator2;
183
184 const int length = width * 2;
185 if (picture->flags & YV12_FLAG_HIGHBITDEPTH) {
186 uint16_t p[4];
187 int pos = 0;
188 for (int y_pos = 0; y_pos < y_end; y_pos++) {
189 for (int x_pos = 0; x_pos < x_end; x_pos++) {
190 get_pixels_in_1D_short_array_by_block_2x2(
191 CONVERT_TO_SHORTPTR(picture->y_buffer) + y_pos * picture->y_stride +
192 x_pos,
193 picture->y_stride, p);
194 pic_block_same_info[0][pos] = is_block16_2x2_row_same_value(p);
195 pic_block_same_info[1][pos] = is_block16_2x2_col_same_value(p);
196
197 pic_block_hash[0][pos] =
198 av1_get_crc_value(calc_1, (uint8_t *)p, length * sizeof(p[0]));
199 pic_block_hash[1][pos] =
200 av1_get_crc_value(calc_2, (uint8_t *)p, length * sizeof(p[0]));
201 pos++;
202 }
203 pos += width - 1;
204 }
205 } else {
206 uint8_t p[4];
207 int pos = 0;
208 for (int y_pos = 0; y_pos < y_end; y_pos++) {
209 for (int x_pos = 0; x_pos < x_end; x_pos++) {
210 get_pixels_in_1D_char_array_by_block_2x2(
211 picture->y_buffer + y_pos * picture->y_stride + x_pos,
212 picture->y_stride, p);
213 pic_block_same_info[0][pos] = is_block_2x2_row_same_value(p);
214 pic_block_same_info[1][pos] = is_block_2x2_col_same_value(p);
215
216 pic_block_hash[0][pos] =
217 av1_get_crc_value(calc_1, p, length * sizeof(p[0]));
218 pic_block_hash[1][pos] =
219 av1_get_crc_value(calc_2, p, length * sizeof(p[0]));
220 pos++;
221 }
222 pos += width - 1;
223 }
224 }
225 }
226
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])227 void av1_generate_block_hash_value(IntraBCHashInfo *intrabc_hash_info,
228 const YV12_BUFFER_CONFIG *picture,
229 int block_size,
230 uint32_t *src_pic_block_hash[2],
231 uint32_t *dst_pic_block_hash[2],
232 int8_t *src_pic_block_same_info[3],
233 int8_t *dst_pic_block_same_info[3]) {
234 CRC_CALCULATOR *calc_1 = &intrabc_hash_info->crc_calculator1;
235 CRC_CALCULATOR *calc_2 = &intrabc_hash_info->crc_calculator2;
236
237 const int pic_width = picture->y_crop_width;
238 const int x_end = picture->y_crop_width - block_size + 1;
239 const int y_end = picture->y_crop_height - block_size + 1;
240
241 const int src_size = block_size >> 1;
242 const int quad_size = block_size >> 2;
243
244 uint32_t p[4];
245 const int length = sizeof(p);
246
247 int pos = 0;
248 for (int y_pos = 0; y_pos < y_end; y_pos++) {
249 for (int x_pos = 0; x_pos < x_end; x_pos++) {
250 p[0] = src_pic_block_hash[0][pos];
251 p[1] = src_pic_block_hash[0][pos + src_size];
252 p[2] = src_pic_block_hash[0][pos + src_size * pic_width];
253 p[3] = src_pic_block_hash[0][pos + src_size * pic_width + src_size];
254 dst_pic_block_hash[0][pos] =
255 av1_get_crc_value(calc_1, (uint8_t *)p, length);
256
257 p[0] = src_pic_block_hash[1][pos];
258 p[1] = src_pic_block_hash[1][pos + src_size];
259 p[2] = src_pic_block_hash[1][pos + src_size * pic_width];
260 p[3] = src_pic_block_hash[1][pos + src_size * pic_width + src_size];
261 dst_pic_block_hash[1][pos] =
262 av1_get_crc_value(calc_2, (uint8_t *)p, length);
263
264 dst_pic_block_same_info[0][pos] =
265 src_pic_block_same_info[0][pos] &&
266 src_pic_block_same_info[0][pos + quad_size] &&
267 src_pic_block_same_info[0][pos + src_size] &&
268 src_pic_block_same_info[0][pos + src_size * pic_width] &&
269 src_pic_block_same_info[0][pos + src_size * pic_width + quad_size] &&
270 src_pic_block_same_info[0][pos + src_size * pic_width + src_size];
271
272 dst_pic_block_same_info[1][pos] =
273 src_pic_block_same_info[1][pos] &&
274 src_pic_block_same_info[1][pos + src_size] &&
275 src_pic_block_same_info[1][pos + quad_size * pic_width] &&
276 src_pic_block_same_info[1][pos + quad_size * pic_width + src_size] &&
277 src_pic_block_same_info[1][pos + src_size * pic_width] &&
278 src_pic_block_same_info[1][pos + src_size * pic_width + src_size];
279 pos++;
280 }
281 pos += block_size - 1;
282 }
283
284 if (block_size >= 4) {
285 const int size_minus_1 = block_size - 1;
286 pos = 0;
287 for (int y_pos = 0; y_pos < y_end; y_pos++) {
288 for (int x_pos = 0; x_pos < x_end; x_pos++) {
289 dst_pic_block_same_info[2][pos] =
290 (!dst_pic_block_same_info[0][pos] &&
291 !dst_pic_block_same_info[1][pos]) ||
292 (((x_pos & size_minus_1) == 0) && ((y_pos & size_minus_1) == 0));
293 pos++;
294 }
295 pos += block_size - 1;
296 }
297 }
298 }
299
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)300 bool av1_add_to_hash_map_by_row_with_precal_data(hash_table *p_hash_table,
301 uint32_t *pic_hash[2],
302 int8_t *pic_is_same,
303 int pic_width, int pic_height,
304 int block_size) {
305 const int x_end = pic_width - block_size + 1;
306 const int y_end = pic_height - block_size + 1;
307
308 const int8_t *src_is_added = pic_is_same;
309 const uint32_t *src_hash[2] = { pic_hash[0], pic_hash[1] };
310
311 int add_value = hash_block_size_to_index(block_size);
312 assert(add_value >= 0);
313 add_value <<= kSrcBits;
314 const int crc_mask = (1 << kSrcBits) - 1;
315
316 for (int x_pos = 0; x_pos < x_end; x_pos++) {
317 for (int y_pos = 0; y_pos < y_end; y_pos++) {
318 const int pos = y_pos * pic_width + x_pos;
319 // valid data
320 if (src_is_added[pos]) {
321 block_hash curr_block_hash;
322 curr_block_hash.x = x_pos;
323 curr_block_hash.y = y_pos;
324
325 const uint32_t hash_value1 = (src_hash[0][pos] & crc_mask) + add_value;
326 curr_block_hash.hash_value2 = src_hash[1][pos];
327
328 if (!hash_table_add_to_table(p_hash_table, hash_value1,
329 &curr_block_hash)) {
330 return false;
331 }
332 }
333 }
334 }
335 return true;
336 }
337
av1_hash_is_horizontal_perfect(const YV12_BUFFER_CONFIG * picture,int block_size,int x_start,int y_start)338 int av1_hash_is_horizontal_perfect(const YV12_BUFFER_CONFIG *picture,
339 int block_size, int x_start, int y_start) {
340 const int stride = picture->y_stride;
341 const uint8_t *p = picture->y_buffer + y_start * stride + x_start;
342
343 if (picture->flags & YV12_FLAG_HIGHBITDEPTH) {
344 const uint16_t *p16 = CONVERT_TO_SHORTPTR(p);
345 for (int i = 0; i < block_size; i++) {
346 for (int j = 1; j < block_size; j++) {
347 if (p16[j] != p16[0]) {
348 return 0;
349 }
350 }
351 p16 += stride;
352 }
353 } else {
354 for (int i = 0; i < block_size; i++) {
355 for (int j = 1; j < block_size; j++) {
356 if (p[j] != p[0]) {
357 return 0;
358 }
359 }
360 p += stride;
361 }
362 }
363
364 return 1;
365 }
366
av1_hash_is_vertical_perfect(const YV12_BUFFER_CONFIG * picture,int block_size,int x_start,int y_start)367 int av1_hash_is_vertical_perfect(const YV12_BUFFER_CONFIG *picture,
368 int block_size, int x_start, int y_start) {
369 const int stride = picture->y_stride;
370 const uint8_t *p = picture->y_buffer + y_start * stride + x_start;
371
372 if (picture->flags & YV12_FLAG_HIGHBITDEPTH) {
373 const uint16_t *p16 = CONVERT_TO_SHORTPTR(p);
374 for (int i = 0; i < block_size; i++) {
375 for (int j = 1; j < block_size; j++) {
376 if (p16[j * stride + i] != p16[i]) {
377 return 0;
378 }
379 }
380 }
381 } else {
382 for (int i = 0; i < block_size; i++) {
383 for (int j = 1; j < block_size; j++) {
384 if (p[j * stride + i] != p[i]) {
385 return 0;
386 }
387 }
388 }
389 }
390 return 1;
391 }
392
av1_get_block_hash_value(IntraBCHashInfo * intrabc_hash_info,const uint8_t * y_src,int stride,int block_size,uint32_t * hash_value1,uint32_t * hash_value2,int use_highbitdepth)393 void av1_get_block_hash_value(IntraBCHashInfo *intrabc_hash_info,
394 const uint8_t *y_src, int stride, int block_size,
395 uint32_t *hash_value1, uint32_t *hash_value2,
396 int use_highbitdepth) {
397 int add_value = hash_block_size_to_index(block_size);
398 assert(add_value >= 0);
399 add_value <<= kSrcBits;
400 const int crc_mask = (1 << kSrcBits) - 1;
401
402 CRC_CALCULATOR *calc_1 = &intrabc_hash_info->crc_calculator1;
403 CRC_CALCULATOR *calc_2 = &intrabc_hash_info->crc_calculator2;
404 uint32_t **buf_1 = intrabc_hash_info->hash_value_buffer[0];
405 uint32_t **buf_2 = intrabc_hash_info->hash_value_buffer[1];
406
407 // 2x2 subblock hash values in current CU
408 int sub_block_in_width = (block_size >> 1);
409 if (use_highbitdepth) {
410 uint16_t pixel_to_hash[4];
411 uint16_t *y16_src = CONVERT_TO_SHORTPTR(y_src);
412 for (int y_pos = 0; y_pos < block_size; y_pos += 2) {
413 for (int x_pos = 0; x_pos < block_size; x_pos += 2) {
414 int pos = (y_pos >> 1) * sub_block_in_width + (x_pos >> 1);
415 get_pixels_in_1D_short_array_by_block_2x2(
416 y16_src + y_pos * stride + x_pos, stride, pixel_to_hash);
417 assert(pos < AOM_BUFFER_SIZE_FOR_BLOCK_HASH);
418 buf_1[0][pos] = av1_get_crc_value(calc_1, (uint8_t *)pixel_to_hash,
419 sizeof(pixel_to_hash));
420 buf_2[0][pos] = av1_get_crc_value(calc_2, (uint8_t *)pixel_to_hash,
421 sizeof(pixel_to_hash));
422 }
423 }
424 } else {
425 uint8_t pixel_to_hash[4];
426 for (int y_pos = 0; y_pos < block_size; y_pos += 2) {
427 for (int x_pos = 0; x_pos < block_size; x_pos += 2) {
428 int pos = (y_pos >> 1) * sub_block_in_width + (x_pos >> 1);
429 get_pixels_in_1D_char_array_by_block_2x2(y_src + y_pos * stride + x_pos,
430 stride, pixel_to_hash);
431 assert(pos < AOM_BUFFER_SIZE_FOR_BLOCK_HASH);
432 buf_1[0][pos] =
433 av1_get_crc_value(calc_1, pixel_to_hash, sizeof(pixel_to_hash));
434 buf_2[0][pos] =
435 av1_get_crc_value(calc_2, pixel_to_hash, sizeof(pixel_to_hash));
436 }
437 }
438 }
439
440 int src_sub_block_in_width = sub_block_in_width;
441 sub_block_in_width >>= 1;
442
443 int src_idx = 1;
444 int dst_idx = 0;
445
446 // 4x4 subblock hash values to current block hash values
447 uint32_t to_hash[4];
448 for (int sub_width = 4; sub_width <= block_size; sub_width *= 2) {
449 src_idx = 1 - src_idx;
450 dst_idx = 1 - dst_idx;
451
452 int dst_pos = 0;
453 for (int y_pos = 0; y_pos < sub_block_in_width; y_pos++) {
454 for (int x_pos = 0; x_pos < sub_block_in_width; x_pos++) {
455 int srcPos = (y_pos << 1) * src_sub_block_in_width + (x_pos << 1);
456
457 assert(srcPos + 1 < AOM_BUFFER_SIZE_FOR_BLOCK_HASH);
458 assert(srcPos + src_sub_block_in_width + 1 <
459 AOM_BUFFER_SIZE_FOR_BLOCK_HASH);
460 assert(dst_pos < AOM_BUFFER_SIZE_FOR_BLOCK_HASH);
461 to_hash[0] = buf_1[src_idx][srcPos];
462 to_hash[1] = buf_1[src_idx][srcPos + 1];
463 to_hash[2] = buf_1[src_idx][srcPos + src_sub_block_in_width];
464 to_hash[3] = buf_1[src_idx][srcPos + src_sub_block_in_width + 1];
465
466 buf_1[dst_idx][dst_pos] =
467 av1_get_crc_value(calc_1, (uint8_t *)to_hash, sizeof(to_hash));
468
469 to_hash[0] = buf_2[src_idx][srcPos];
470 to_hash[1] = buf_2[src_idx][srcPos + 1];
471 to_hash[2] = buf_2[src_idx][srcPos + src_sub_block_in_width];
472 to_hash[3] = buf_2[src_idx][srcPos + src_sub_block_in_width + 1];
473 buf_2[dst_idx][dst_pos] =
474 av1_get_crc_value(calc_2, (uint8_t *)to_hash, sizeof(to_hash));
475 dst_pos++;
476 }
477 }
478
479 src_sub_block_in_width = sub_block_in_width;
480 sub_block_in_width >>= 1;
481 }
482
483 *hash_value1 = (buf_1[dst_idx][0] & crc_mask) + add_value;
484 *hash_value2 = buf_2[dst_idx][0];
485 }
486