Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Copyright (C) 2015 The Android Open Source Project |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at: |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | ***************************************************************************** |
| 18 | * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore |
| 19 | */ |
| 20 | /** |
| 21 | ******************************************************************************* |
| 22 | * @file |
| 23 | * ih264_chroma_intra_pred_filters.c |
| 24 | * |
| 25 | * @brief |
| 26 | * Contains function definitions for chroma intra prediction filters |
| 27 | * |
| 28 | * @author |
| 29 | * Ittiam |
| 30 | * |
| 31 | * @par List of Functions: |
| 32 | * -ih264_intra_pred_chroma_8x8_mode_dc |
| 33 | * -ih264_intra_pred_chroma_8x8_mode_horz |
| 34 | * -ih264_intra_pred_chroma_8x8_mode_vert |
| 35 | * -ih264_intra_pred_chroma_8x8_mode_plane |
| 36 | * |
| 37 | * @remarks |
| 38 | * None |
| 39 | * |
| 40 | ******************************************************************************* |
| 41 | */ |
| 42 | |
| 43 | /*****************************************************************************/ |
| 44 | /* File Includes */ |
| 45 | /*****************************************************************************/ |
| 46 | |
| 47 | /* System include files */ |
| 48 | #include <stdio.h> |
| 49 | #include <stddef.h> |
| 50 | #include <string.h> |
| 51 | |
| 52 | /* User include files */ |
| 53 | #include "ih264_defs.h" |
| 54 | #include "ih264_typedefs.h" |
| 55 | #include "ih264_macros.h" |
| 56 | #include "ih264_platform_macros.h" |
| 57 | #include "ih264_intra_pred_filters.h" |
| 58 | |
| 59 | /* Global variables used only in assembly files*/ |
| 60 | const WORD8 ih264_gai1_intrapred_chroma_plane_coeffs1[] = |
| 61 | { 0x01,0x00,0x01,0x00, |
| 62 | 0x02,0x00,0x02,0x00, |
| 63 | 0x03,0x00,0x03,0x00, |
| 64 | 0x04,0x00,0x04,0x00 |
| 65 | }; |
| 66 | const WORD8 ih264_gai1_intrapred_chroma_plane_coeffs2[] = |
| 67 | { 0xfd,0xff,0xfe,0xff, |
| 68 | 0xff,0xff,0x00,0x00, |
| 69 | 0x01,0x00,0x02,0x00, |
| 70 | 0x03,0x00,0x04,0x00, |
| 71 | }; |
| 72 | |
| 73 | /*****************************************************************************/ |
| 74 | /* Chroma Intra prediction 8x8 filters */ |
| 75 | /*****************************************************************************/ |
| 76 | |
| 77 | /** |
| 78 | ******************************************************************************* |
| 79 | * |
| 80 | * ih264_intra_pred_chroma_8x8_mode_dc |
| 81 | * |
| 82 | * @brief |
| 83 | * Perform Intra prediction for chroma_8x8 mode:DC |
| 84 | * |
| 85 | * @par Description: |
| 86 | * Perform Intra prediction for chroma_8x8 mode:DC ,described in sec 8.3.4.1 |
| 87 | * |
| 88 | * @param[in] pu1_src |
| 89 | * UWORD8 pointer to the source containing alternate U and V samples |
| 90 | * |
| 91 | * @param[out] pu1_dst |
| 92 | * UWORD8 pointer to the destination with alternate U and V samples |
| 93 | * |
| 94 | * @param[in] src_strd |
| 95 | * integer source stride |
| 96 | * |
| 97 | * @param[in] dst_strd |
| 98 | * integer destination stride |
| 99 | * |
| 100 | ** @param[in] ngbr_avail |
| 101 | * availability of neighbouring pixels |
| 102 | * |
| 103 | * @returns |
| 104 | * |
| 105 | * @remarks |
| 106 | * None |
| 107 | * |
| 108 | ****************************************************************************** |
| 109 | */ |
| 110 | void ih264_intra_pred_chroma_8x8_mode_dc(UWORD8 *pu1_src, |
| 111 | UWORD8 *pu1_dst, |
| 112 | WORD32 src_strd, |
| 113 | WORD32 dst_strd, |
| 114 | WORD32 ngbr_avail) |
| 115 | { |
| 116 | WORD32 left_avail, left_avail1, left_avail2; /* availability of left predictors (only for DC) */ |
| 117 | WORD32 top_avail; /* availability of top predictors (only for DC) */ |
| 118 | UWORD8 *pu1_left = NULL; /* Pointer to start of left predictors */ |
| 119 | UWORD8 *pu1_top = NULL; /* Pointer to start of top predictors */ |
Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame] | 120 | |
| 121 | /* temporary variables to store accumulated first left half,second left half, |
| 122 | * first top half,second top half of U and V values*/ |
| 123 | WORD32 val_u_l1 = 0, val_u_l2 = 0, val_u_t1 = 0, val_u_t2 = 0; |
| 124 | WORD32 val_v_l1 = 0, val_v_l2 = 0, val_v_t1 = 0, val_v_t2 = 0; |
| 125 | |
| 126 | WORD32 val_u1 = 0, val_u2 = 0, val_v1 = 0, val_v2 = 0; |
| 127 | |
| 128 | WORD32 col, row; /*loop variables*/ |
Martin Storsjo | cc87241 | 2015-06-13 00:35:01 +0300 | [diff] [blame] | 129 | UNUSED(src_strd); |
Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame] | 130 | |
| 131 | left_avail = ngbr_avail & 0x11; |
| 132 | left_avail1 = ngbr_avail & 1; |
| 133 | left_avail2 = (ngbr_avail >> 4) & 1; |
| 134 | top_avail = (ngbr_avail >> 2) & 1; |
| 135 | |
| 136 | pu1_top = pu1_src + 2 * BLK8x8SIZE + 2; |
| 137 | pu1_left = pu1_src + 2 * BLK8x8SIZE - 2; |
| 138 | |
| 139 | if(left_avail1) |
| 140 | { /* First 4x4 block*/ |
| 141 | val_u_l1 += *pu1_left; |
| 142 | val_v_l1 += *(pu1_left + 1); |
| 143 | pu1_left -= 2; |
| 144 | val_u_l1 += *pu1_left; |
| 145 | val_v_l1 += *(pu1_left + 1); |
| 146 | pu1_left -= 2; |
| 147 | val_u_l1 += *pu1_left; |
| 148 | val_v_l1 += *(pu1_left + 1); |
| 149 | pu1_left -= 2; |
| 150 | val_u_l1 += *pu1_left + 2; |
| 151 | val_v_l1 += *(pu1_left + 1) + 2; |
| 152 | pu1_left -= 2; |
| 153 | } |
| 154 | else |
| 155 | pu1_left -= 2 * 4; |
| 156 | |
| 157 | if(left_avail2) |
| 158 | { |
| 159 | /* Second 4x4 block*/ |
| 160 | val_u_l2 += *pu1_left; |
| 161 | val_v_l2 += *(pu1_left + 1); |
| 162 | pu1_left -= 2; |
| 163 | val_u_l2 += *pu1_left; |
| 164 | val_v_l2 += *(pu1_left + 1); |
| 165 | pu1_left -= 2; |
| 166 | val_u_l2 += *pu1_left; |
| 167 | val_v_l2 += *(pu1_left + 1); |
| 168 | pu1_left -= 2; |
| 169 | val_u_l2 += *pu1_left + 2; |
| 170 | val_v_l2 += *(pu1_left + 1) + 2; |
| 171 | pu1_left -= 2; |
| 172 | } |
| 173 | else |
| 174 | pu1_left -= 2 * 4; |
| 175 | |
| 176 | if(top_avail) |
| 177 | { |
| 178 | val_u_t1 += *pu1_top + *(pu1_top + 2) + *(pu1_top + 4) |
| 179 | + *(pu1_top + 6) + 2; |
| 180 | val_u_t2 += *(pu1_top + 8) + *(pu1_top + 10) + *(pu1_top + 12) |
| 181 | + *(pu1_top + 14) + 2; |
| 182 | val_v_t1 += *(pu1_top + 1) + *(pu1_top + 3) + *(pu1_top + 5) |
| 183 | + *(pu1_top + 7) + 2; |
| 184 | val_v_t2 += *(pu1_top + 9) + *(pu1_top + 11) + *(pu1_top + 13) |
| 185 | + *(pu1_top + 15) + 2; |
| 186 | } |
| 187 | |
| 188 | if(left_avail + top_avail) |
| 189 | { |
| 190 | val_u1 = (left_avail1 + top_avail) ? |
| 191 | ((val_u_l1 + val_u_t1) |
| 192 | >> (1 + left_avail1 + top_avail)) :128; |
| 193 | val_v1 = (left_avail1 + top_avail) ? |
| 194 | ((val_v_l1 + val_v_t1) |
| 195 | >> (1 + left_avail1 + top_avail)) :128; |
| 196 | if(top_avail) |
| 197 | { |
| 198 | val_u2 = val_u_t2 >> 2; |
| 199 | val_v2 = val_v_t2 >> 2; |
| 200 | } |
| 201 | else if(left_avail1) |
| 202 | { |
| 203 | val_u2 = val_u_l1 >> 2; |
| 204 | val_v2 = val_v_l1 >> 2; |
| 205 | } |
| 206 | else |
| 207 | { |
| 208 | val_u2 = val_v2 = 128; |
| 209 | } |
| 210 | |
| 211 | for(row = 0; row < 4; row++) |
| 212 | { |
| 213 | /*top left 4x4 block*/ |
| 214 | for(col = 0; col < 8; col += 2) |
| 215 | { |
| 216 | *(pu1_dst + row * dst_strd + col) = val_u1; |
| 217 | *(pu1_dst + row * dst_strd + col + 1) = val_v1; |
| 218 | } |
| 219 | /*top right 4x4 block*/ |
| 220 | for(col = 8; col < 16; col += 2) |
| 221 | { |
| 222 | *(pu1_dst + row * dst_strd + col) = val_u2; |
| 223 | *(pu1_dst + row * dst_strd + col + 1) = val_v2; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | if(left_avail2) |
| 228 | { |
| 229 | val_u1 = val_u_l2 >> 2; |
| 230 | val_v1 = val_v_l2 >> 2; |
| 231 | } |
| 232 | else if(top_avail) |
| 233 | { |
| 234 | val_u1 = val_u_t1 >> 2; |
| 235 | val_v1 = val_v_t1 >> 2; |
| 236 | } |
| 237 | else |
| 238 | { |
| 239 | val_u1 = val_v1 = 128; |
| 240 | } |
| 241 | val_u2 = (left_avail2 + top_avail) ? |
| 242 | ((val_u_l2 + val_u_t2) |
| 243 | >> (1 + left_avail2 + top_avail)) : 128; |
| 244 | val_v2 = (left_avail2 + top_avail) ? |
| 245 | ((val_v_l2 + val_v_t2) |
| 246 | >> (1 + left_avail2 + top_avail)) : 128; |
| 247 | |
| 248 | for(row = 4; row < 8; row++) |
| 249 | { /*bottom left 4x4 block*/ |
| 250 | for(col = 0; col < 8; col += 2) |
| 251 | { |
| 252 | *(pu1_dst + row * dst_strd + col) = val_u1; |
| 253 | *(pu1_dst + row * dst_strd + col + 1) = val_v1; |
| 254 | } |
| 255 | /*bottom right 4x4 block*/ |
| 256 | for(col = 8; col < 16; col += 2) |
| 257 | { |
| 258 | *(pu1_dst + row * dst_strd + col) = val_u2; |
| 259 | *(pu1_dst + row * dst_strd + col + 1) = val_v2; |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | else |
| 264 | { |
| 265 | /* Both left and top are unavailable, set the block to 128 */ |
| 266 | for(row = 0; row < 8; row++) |
| 267 | { |
| 268 | memset(pu1_dst + row * dst_strd, 128, 8 * sizeof(UWORD16)); |
| 269 | } |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | ******************************************************************************* |
| 275 | * |
| 276 | *ih264_intra_pred_chroma_8x8_mode_horz |
| 277 | * |
| 278 | * @brief |
| 279 | * Perform Intra prediction for chroma_8x8 mode:Horizontal |
| 280 | * |
| 281 | * @par Description: |
| 282 | * Perform Intra prediction for chroma_8x8 mode:Horizontal ,described in sec 8.3.4.2 |
| 283 | * |
| 284 | * @param[in] pu1_src |
| 285 | * UWORD8 pointer to the source containing alternate U and V samples |
| 286 | * |
| 287 | * @param[out] pu1_dst |
| 288 | * UWORD8 pointer to the destination with alternate U and V samples |
| 289 | * |
| 290 | * @param[in] src_strd |
| 291 | * integer source stride |
| 292 | * |
| 293 | * @param[in] dst_strd |
| 294 | * integer destination stride |
| 295 | * |
| 296 | * @param[in] ngbr_avail |
| 297 | * availability of neighbouring pixels(Not used in this function) |
| 298 | * |
| 299 | * @returns |
| 300 | * |
| 301 | * @remarks |
| 302 | * None |
| 303 | * |
| 304 | ****************************************************************************** |
| 305 | */ |
| 306 | void ih264_intra_pred_chroma_8x8_mode_horz(UWORD8 *pu1_src, |
| 307 | UWORD8 *pu1_dst, |
| 308 | WORD32 src_strd, |
| 309 | WORD32 dst_strd, |
| 310 | WORD32 ngbr_avail) |
| 311 | { |
| 312 | |
| 313 | UWORD8 *pu1_left = NULL; /* Pointer to start of top predictors */ |
| 314 | WORD32 rows, cols; /* loop variables*/ |
| 315 | UNUSED(src_strd); |
| 316 | UNUSED(ngbr_avail); |
| 317 | pu1_left = pu1_src + 2 * BLK8x8SIZE - 2; |
| 318 | for(rows = 0; rows < 8; rows++) |
| 319 | { |
| 320 | for(cols = 0; cols < 16; cols += 2) |
| 321 | { |
| 322 | *(pu1_dst + rows * dst_strd + cols) = *pu1_left; |
| 323 | |
| 324 | *(pu1_dst + rows * dst_strd + cols + 1) = *(pu1_left + 1); |
| 325 | } |
| 326 | pu1_left -= 2; |
| 327 | } |
| 328 | |
| 329 | } |
| 330 | |
| 331 | /** |
| 332 | ******************************************************************************* |
| 333 | * |
| 334 | *ih264_intra_pred_chroma_8x8_mode_vert |
| 335 | * |
| 336 | * @brief |
| 337 | * Perform Intra prediction for chroma_8x8 mode:vertical |
| 338 | * |
| 339 | * @par Description: |
| 340 | * Perform Intra prediction for chroma_8x8 mode:vertical ,described in sec 8.3.4.3 |
| 341 | * |
| 342 | * @param[in] pu1_src |
| 343 | * UWORD8 pointer to the source containing alternate U and V samples |
| 344 | * |
| 345 | * @param[out] pu1_dst |
| 346 | * UWORD8 pointer to the destination with alternate U and V samples |
| 347 | * |
| 348 | * @param[in] src_strd |
| 349 | * integer source stride |
| 350 | * |
| 351 | * @param[in] dst_strd |
| 352 | * integer destination stride |
| 353 | * |
| 354 | * @param[in] ngbr_avail |
| 355 | * availability of neighbouring pixels(Not used in this function) |
| 356 | * |
| 357 | * @returns |
| 358 | * |
| 359 | * @remarks |
| 360 | * None |
| 361 | * |
| 362 | ******************************************************************************* |
| 363 | */ |
| 364 | void ih264_intra_pred_chroma_8x8_mode_vert(UWORD8 *pu1_src, |
| 365 | UWORD8 *pu1_dst, |
| 366 | WORD32 src_strd, |
| 367 | WORD32 dst_strd, |
| 368 | WORD32 ngbr_avail) |
| 369 | { |
| 370 | |
| 371 | UWORD8 *pu1_top = NULL; /* Pointer to start of top predictors */ |
| 372 | WORD32 row;/*loop variable*/ |
| 373 | UNUSED(src_strd); |
| 374 | UNUSED(ngbr_avail); |
| 375 | pu1_top = pu1_src + 2 * BLK8x8SIZE + 2; |
| 376 | |
| 377 | /* 8 bytes are copied from src to dst */ |
| 378 | for(row = 0; row < 2; row++) |
| 379 | { |
| 380 | memcpy(pu1_dst, pu1_top, 16); |
| 381 | |
| 382 | pu1_dst += dst_strd; |
| 383 | memcpy(pu1_dst, pu1_top, 16); |
| 384 | |
| 385 | pu1_dst += dst_strd; |
| 386 | memcpy(pu1_dst, pu1_top, 16); |
| 387 | |
| 388 | pu1_dst += dst_strd; |
| 389 | memcpy(pu1_dst, pu1_top, 16); |
| 390 | |
| 391 | pu1_dst += dst_strd; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /** |
| 396 | ******************************************************************************* |
| 397 | * |
| 398 | * ih264_intra_pred_chroma_8x8_mode_plane |
| 399 | * |
| 400 | * @brief |
| 401 | * Perform Intra prediction for chroma_8x8 mode:PLANE |
| 402 | * |
| 403 | * @par Description: |
| 404 | * Perform Intra prediction for chroma_8x8 mode:PLANE ,described in sec 8.3.4.4 |
| 405 | * |
| 406 | * @param[in] pu1_src |
| 407 | * UWORD8 pointer to the source containing alternate U and V samples |
| 408 | * |
| 409 | * @param[out] pu1_dst |
| 410 | * UWORD8 pointer to the destination with alternate U and V samples |
| 411 | * |
| 412 | * @param[in] src_strd |
| 413 | * integer source stride |
| 414 | * |
| 415 | * @param[in] dst_strd |
| 416 | * integer destination stride |
| 417 | * |
| 418 | * @param[in] ngbr_avail |
| 419 | * availability of neighbouring pixels(Not used in this function) |
| 420 | * |
| 421 | * @returns |
| 422 | * |
| 423 | * @remarks |
| 424 | * None |
| 425 | * |
| 426 | ****************************************************************************** |
| 427 | */ |
| 428 | void ih264_intra_pred_chroma_8x8_mode_plane(UWORD8 *pu1_src, |
| 429 | UWORD8 *pu1_dst, |
| 430 | WORD32 src_strd, |
| 431 | WORD32 dst_strd, |
| 432 | WORD32 ngbr_avail) |
| 433 | { |
| 434 | |
| 435 | UWORD8 *pu1_left = NULL; /* Pointer to start of left predictors */ |
| 436 | UWORD8 *pu1_top = NULL; /* Pointer to start of top predictors */ |
| 437 | WORD32 val = 0; |
| 438 | WORD32 rows, cols; /* loop variables*/ |
| 439 | WORD32 a_u, b_u, c_u, h_u, v_u; /* Implementing section 8.3.4.4 . The variables represent the corresponding variables in the section*/ |
| 440 | WORD32 a_v, b_v, c_v, h_v, v_v; |
| 441 | UNUSED(src_strd); |
| 442 | UNUSED(ngbr_avail); |
| 443 | a_u = b_u = c_u = h_u = v_u = 0; |
| 444 | a_v = b_v = c_v = h_v = v_v = 0; |
| 445 | /* As chroma format 4:2:0 is used,xCF = 4 * ( chroma_format_idc = = 3 ) = 0 and |
| 446 | yCF = 4 * ( chroma_format_idc != 1 ) = 0 */ |
| 447 | pu1_top = pu1_src + 2 * BLK8x8SIZE + 2; |
| 448 | pu1_left = pu1_src + 2 * BLK8x8SIZE - 2; |
| 449 | /* Implementing section 8.3.4.4 */ |
| 450 | for(cols = 0; cols < 4; cols++) |
| 451 | { |
| 452 | h_u += (cols + 1) * (pu1_top[8 + 2 * cols] - pu1_top[4 - 2 * cols]);/*section 8.3.4.4 equation (8-144)*/ |
| 453 | h_v += (cols + 1) * (pu1_top[8 + 2 * cols + 1] - pu1_top[4 - 2 * cols+ 1]); |
| 454 | |
| 455 | v_u += (cols + 1) * (pu1_left[(4 + cols) * (-2)] - pu1_left[(2 - cols) * (-2)]); |
| 456 | v_v += (cols + 1) * (pu1_left[(4 + cols) * (-2) + 1] - pu1_left[(2 - cols) * (-2) + 1]);/*section 8.3.4.4 equation (8-145)*/ |
| 457 | } |
| 458 | a_u = 16 * (pu1_left[7 * (-2)] + pu1_top[14]); |
| 459 | a_v = 16 * (pu1_left[7 * (-2) + 1] + pu1_top[15]);/*section 8.3.3.4 equation (8-141)*/ |
| 460 | b_u = (34 * h_u + 32) >> 6;/*section 8.3.3.4 equation (8-142)*/ |
| 461 | b_v = (34 * h_v + 32) >> 6;/*section 8.3.3.4 equation (8-142)*/ |
| 462 | c_u = (34 * v_u + 32) >> 6;/*section 8.3.3.4 equation (8-143)*/ |
| 463 | c_v = (34 * v_v + 32) >> 6;/*section 8.3.3.4 equation (8-143)*/ |
| 464 | |
| 465 | for(rows = 0; rows < 8; rows++) |
| 466 | { |
| 467 | for(cols = 0; cols < 8; cols++) |
| 468 | { |
| 469 | val = (a_u + b_u * (cols - 3) + c_u * (rows - 3) );/*section 8.3.4.4 equation (8-140)*/ |
| 470 | val = (val + 16) >> 5; |
| 471 | *(pu1_dst + rows * dst_strd + 2 * cols) = CLIP_U8(val); |
| 472 | val = (a_v + b_v * (cols - 3) + c_v * (rows - 3) );/*section 8.3.4.4 equation (8-140)*/ |
| 473 | val = (val + 16) >> 5; |
| 474 | *(pu1_dst + rows * dst_strd + 2 * cols + 1) = CLIP_U8(val); |
| 475 | } |
| 476 | } |
| 477 | } |
| 478 | |