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 ih264d_parse_mb_header.c |
| 23 | * |
| 24 | * \brief |
| 25 | * This file contains context identifier encoding routines. |
| 26 | * |
| 27 | * \date |
| 28 | * 04/02/2003 |
| 29 | * |
| 30 | * \author NS |
| 31 | *************************************************************************** |
| 32 | */ |
| 33 | #include <string.h> |
| 34 | #include "ih264d_structs.h" |
| 35 | #include "ih264d_bitstrm.h" |
| 36 | #include "ih264d_cabac.h" |
| 37 | #include "ih264_typedefs.h" |
| 38 | #include "ih264_macros.h" |
| 39 | #include "ih264_platform_macros.h" |
| 40 | #include "ih264d_defs.h" |
| 41 | #include "ih264d_error_handler.h" |
| 42 | #include "ih264d_tables.h" |
| 43 | #include "ih264d_debug.h" |
| 44 | #include "ih264d_defs.h" |
| 45 | #include "ih264d_defs.h" |
| 46 | #include "ih264d_mb_utils.h" |
| 47 | #include "ih264d_parse_mb_header.h" |
| 48 | #include "ih264d_defs.h" |
| 49 | |
| 50 | /*! < CtxtInc index 0 - CtxMbTypeI, CtxMbTypeSISuffix |
| 51 | index 1 - CtxMbTypePSuffix, CtxMbTypeBSuffix |
| 52 | */ |
| 53 | |
| 54 | |
| 55 | |
| 56 | /*! |
| 57 | ************************************************************************** |
| 58 | * \if Function name : ih264d_parse_mb_type_intra_cabac \endif |
| 59 | * |
| 60 | * \brief |
| 61 | * This function decodes MB type using CABAC entropy coding mode. |
| 62 | * |
| 63 | * \return |
| 64 | * MBType. |
| 65 | * |
| 66 | ************************************************************************** |
| 67 | */ |
| 68 | UWORD8 ih264d_parse_mb_type_intra_cabac(UWORD8 u1_inter, |
| 69 | struct _DecStruct * ps_dec) |
| 70 | { |
| 71 | decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env; |
| 72 | dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm; |
| 73 | ctxt_inc_mb_info_t * ps_left_ctxt = ps_dec->p_left_ctxt_mb_info; |
| 74 | ctxt_inc_mb_info_t * ps_top_ctxt = ps_dec->p_top_ctxt_mb_info; |
| 75 | bin_ctxt_model_t *ps_mb_bin_ctxt = ps_dec->p_mb_type_t; |
| 76 | WORD8 u1_mb_type, u1_bin; |
| 77 | UWORD32 u4_cxt_inc; |
| 78 | |
| 79 | u4_cxt_inc = 0; |
| 80 | if(!u1_inter) |
| 81 | { |
| 82 | if(ps_left_ctxt != ps_dec->ps_def_ctxt_mb_info) |
| 83 | u4_cxt_inc += ((ps_left_ctxt->u1_mb_type != CAB_I4x4) ? 1 : 0); |
| 84 | if(ps_top_ctxt != ps_dec->ps_def_ctxt_mb_info) |
| 85 | u4_cxt_inc += ((ps_top_ctxt->u1_mb_type != CAB_I4x4) ? 1 : 0); |
| 86 | } |
| 87 | else |
| 88 | { |
| 89 | ps_mb_bin_ctxt = ps_mb_bin_ctxt + 3 + (ps_dec->u1_B << 1); |
| 90 | } |
| 91 | |
| 92 | /* b0 */ |
| 93 | u1_mb_type = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, ps_bitstrm, |
| 94 | ps_cab_env); |
| 95 | if(u1_mb_type) |
| 96 | { |
| 97 | /* I16x16 or I_PCM mode */ |
| 98 | /* b1 */ |
| 99 | u1_bin = ih264d_decode_terminate(ps_cab_env, ps_bitstrm); |
| 100 | if(u1_bin == 0) |
| 101 | { |
| 102 | /* I16x16 mode */ |
| 103 | /* Read b2 and b3 */ |
| 104 | u4_cxt_inc = (u1_inter) ? 0x021 : 0x043; |
| 105 | |
| 106 | u1_bin = ih264d_decode_bins(2, u4_cxt_inc, ps_mb_bin_ctxt, ps_bitstrm, |
| 107 | ps_cab_env); |
| 108 | |
| 109 | if(u1_bin & 0x01) |
| 110 | u1_mb_type += 4; |
| 111 | |
| 112 | if(u1_bin & 0x02) |
| 113 | u1_mb_type += 12; |
| 114 | |
| 115 | if(u1_bin & 0x01) |
| 116 | { |
| 117 | /* since b3=1, Read three bins */ |
| 118 | u4_cxt_inc = (u1_inter) ? 0x0332 : 0x0765; |
| 119 | u1_bin = (UWORD8)ih264d_decode_bins(3, u4_cxt_inc, ps_mb_bin_ctxt, |
| 120 | ps_bitstrm, ps_cab_env); |
| 121 | |
| 122 | } |
| 123 | else |
| 124 | { |
| 125 | /* Read two bins */ |
| 126 | u4_cxt_inc = (u1_inter) ? 0x033 : 0x076; |
| 127 | u1_bin = (UWORD8)ih264d_decode_bins(2, u4_cxt_inc, ps_mb_bin_ctxt, |
| 128 | ps_bitstrm, ps_cab_env); |
| 129 | } |
| 130 | u1_mb_type += u1_bin; |
| 131 | } |
| 132 | else |
| 133 | { |
| 134 | /* I_PCM mode */ |
| 135 | /* b1=1 */ |
| 136 | u1_mb_type = 25; |
| 137 | } |
| 138 | } |
| 139 | return (u1_mb_type); |
| 140 | } |
| 141 | |
| 142 | /*! |
| 143 | ************************************************************************** |
| 144 | * \if Function name : ih264d_parse_mb_type_cabac \endif |
| 145 | * |
| 146 | * \brief |
| 147 | * This function decodes MB type using CABAC entropy coding mode. |
| 148 | * |
| 149 | * \return |
| 150 | * MBType. |
| 151 | * |
| 152 | ************************************************************************** |
| 153 | */ |
| 154 | UWORD32 ih264d_parse_mb_type_cabac(struct _DecStruct * ps_dec) |
| 155 | { |
| 156 | const UWORD8 uc_slice_type = ps_dec->ps_cur_slice->u1_slice_type; |
| 157 | decoding_envirnoment_t *ps_cab_env = &ps_dec->s_cab_dec_env; |
| 158 | dec_bit_stream_t *ps_bitstrm = ps_dec->ps_bitstrm; |
| 159 | ctxt_inc_mb_info_t *ps_left_ctxt = ps_dec->p_left_ctxt_mb_info; |
| 160 | ctxt_inc_mb_info_t *ps_top_ctxt = ps_dec->p_top_ctxt_mb_info; |
| 161 | WORD8 c_ctxt_inc; |
| 162 | bin_ctxt_model_t *ps_mb_bin_ctxt = ps_dec->p_mb_type_t; |
| 163 | WORD8 u1_mb_type = 0, u1_bin; |
| 164 | UWORD32 u4_cxt_inc; |
| 165 | |
| 166 | INC_SYM_COUNT(ps_cab_env); |
| 167 | |
| 168 | c_ctxt_inc = 0; |
| 169 | |
| 170 | if(uc_slice_type == SI_SLICE) |
| 171 | { |
| 172 | /* b0 */ |
| 173 | if(ps_left_ctxt != ps_dec->ps_def_ctxt_mb_info) |
| 174 | c_ctxt_inc += ((ps_left_ctxt->u1_mb_type != CAB_SI4x4) ? 1 : 0); |
| 175 | if(ps_top_ctxt != ps_dec->ps_def_ctxt_mb_info) |
| 176 | c_ctxt_inc += ((ps_top_ctxt->u1_mb_type != CAB_SI4x4) ? 1 : 0); |
| 177 | |
| 178 | u4_cxt_inc = c_ctxt_inc; |
| 179 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, ps_bitstrm, |
| 180 | ps_cab_env); |
| 181 | if(u1_bin == 0) |
| 182 | { |
| 183 | /* SI MB */ |
| 184 | u1_mb_type = 0; |
| 185 | } |
| 186 | else |
| 187 | { |
| 188 | u1_mb_type = 1 + ih264d_parse_mb_type_intra_cabac(0, ps_dec); |
| 189 | } |
| 190 | } |
| 191 | else if(uc_slice_type == P_SLICE) |
| 192 | { |
| 193 | /* P Slice */ |
| 194 | /* b0 */ |
| 195 | u4_cxt_inc = 0; |
| 196 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, ps_bitstrm, |
| 197 | ps_cab_env); |
| 198 | if(!u1_bin) |
| 199 | { |
| 200 | /* Inter MB types */ |
| 201 | /* b1 */ |
| 202 | u4_cxt_inc = 0x01; |
| 203 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, |
| 204 | ps_bitstrm, ps_cab_env); |
| 205 | /* b2 */ |
| 206 | u4_cxt_inc = u1_bin + 2; |
| 207 | u1_mb_type = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, |
| 208 | ps_bitstrm, ps_cab_env); |
| 209 | u1_mb_type = (u1_bin << 1) + u1_mb_type; |
| 210 | if(u1_mb_type) |
| 211 | u1_mb_type = 4 - u1_mb_type; |
| 212 | } |
| 213 | else |
| 214 | { |
| 215 | /* Intra Prefix 1 found */ |
| 216 | /* Intra MB type */ |
| 217 | u1_mb_type = 5 + ih264d_parse_mb_type_intra_cabac(1, ps_dec); |
| 218 | } |
| 219 | } |
| 220 | else if(uc_slice_type == B_SLICE) |
| 221 | { |
| 222 | WORD8 a, b; |
| 223 | /* B Slice */ |
| 224 | /* b0 */ |
| 225 | /* a = b = 0, if B slice and MB is a SKIP or B_DIRECT16x16 */ |
| 226 | a = 0; |
| 227 | b = 0; |
| 228 | u1_mb_type = 0; |
| 229 | if(ps_left_ctxt != ps_dec->ps_def_ctxt_mb_info) |
| 230 | a = ((ps_left_ctxt->u1_mb_type & CAB_BD16x16_MASK) != CAB_BD16x16); |
| 231 | if(ps_top_ctxt != ps_dec->ps_def_ctxt_mb_info) |
| 232 | b = ((ps_top_ctxt->u1_mb_type & CAB_BD16x16_MASK) != CAB_BD16x16); |
| 233 | |
| 234 | u4_cxt_inc = a + b; |
| 235 | |
| 236 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, ps_bitstrm, |
| 237 | ps_cab_env); |
| 238 | |
| 239 | if(u1_bin) |
| 240 | { |
| 241 | |
| 242 | /* b1 */ |
| 243 | u4_cxt_inc = 0x03; |
| 244 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, |
| 245 | ps_bitstrm, ps_cab_env); |
| 246 | |
| 247 | if(!u1_bin) |
| 248 | { |
| 249 | /* b2 */ |
| 250 | u4_cxt_inc = 0x05; |
| 251 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, |
| 252 | ps_bitstrm, ps_cab_env); |
| 253 | |
| 254 | u1_mb_type = u1_bin + 1; |
| 255 | } |
| 256 | else |
| 257 | { |
| 258 | u1_mb_type = 3; |
| 259 | /* b2 */ |
| 260 | u4_cxt_inc = 0x04; |
| 261 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, |
| 262 | ps_bitstrm, ps_cab_env); |
| 263 | |
| 264 | if(u1_bin) |
| 265 | { |
| 266 | u1_mb_type += 8; |
| 267 | /* b3 */ |
| 268 | u4_cxt_inc = 0x05; |
| 269 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, |
| 270 | ps_bitstrm, ps_cab_env); |
| 271 | |
| 272 | if(!u1_bin) |
| 273 | { |
| 274 | u1_mb_type++; |
| 275 | /* b4, b5, b6 */ |
| 276 | u4_cxt_inc = 0x0555; |
| 277 | u1_bin = (UWORD8)ih264d_decode_bins(3, u4_cxt_inc, |
| 278 | ps_mb_bin_ctxt, |
| 279 | ps_bitstrm, |
| 280 | ps_cab_env); |
| 281 | |
| 282 | |
| 283 | |
| 284 | u1_mb_type += u1_bin; |
| 285 | } |
| 286 | else |
| 287 | { |
| 288 | /* b4 */ |
| 289 | u4_cxt_inc = 0x05; |
| 290 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, |
| 291 | ps_mb_bin_ctxt, |
| 292 | ps_bitstrm, |
| 293 | ps_cab_env); |
| 294 | |
| 295 | if(u1_bin) |
| 296 | { |
| 297 | /* b5 */ |
| 298 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, |
| 299 | ps_mb_bin_ctxt, |
| 300 | ps_bitstrm, |
| 301 | ps_cab_env); |
| 302 | |
| 303 | u1_mb_type += (u1_bin ? 11 : 0); |
| 304 | } |
| 305 | else |
| 306 | { |
| 307 | u1_mb_type = 20; |
| 308 | /* b5 */ |
| 309 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, |
| 310 | ps_mb_bin_ctxt, |
| 311 | ps_bitstrm, |
| 312 | ps_cab_env); |
| 313 | |
| 314 | if(!u1_bin) |
| 315 | { |
| 316 | /* b6 */ |
| 317 | u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, |
| 318 | ps_mb_bin_ctxt, |
| 319 | ps_bitstrm, |
| 320 | ps_cab_env); |
| 321 | |
| 322 | u1_mb_type += u1_bin; |
| 323 | } |
| 324 | else |
| 325 | { |
| 326 | /* Intra Prefix 111101 found */ |
| 327 | /* Intra MB type */ |
| 328 | u1_mb_type = |
| 329 | 23 |
| 330 | + ih264d_parse_mb_type_intra_cabac( |
| 331 | 1, |
| 332 | ps_dec); |
| 333 | } |
| 334 | } |
| 335 | } |
| 336 | } |
| 337 | else |
| 338 | { |
| 339 | /* b3, b4, b5 */ |
| 340 | u4_cxt_inc = 0x0555; |
| 341 | u1_bin = (UWORD8)ih264d_decode_bins(3, u4_cxt_inc, |
| 342 | ps_mb_bin_ctxt, ps_bitstrm, |
| 343 | ps_cab_env); |
| 344 | |
| 345 | |
| 346 | |
| 347 | |
| 348 | u1_mb_type += u1_bin; |
| 349 | } |
| 350 | } |
| 351 | } |
| 352 | } |
| 353 | return ((UWORD32)u1_mb_type); |
| 354 | } |
| 355 | |
| 356 | /*! |
| 357 | ************************************************************************** |
| 358 | * \if Function name : DecSubMBType \endif |
| 359 | * |
| 360 | * \brief |
| 361 | * This function decodes MB type using CABAC entropy coding mode. |
| 362 | * |
| 363 | * \return |
| 364 | * MBType. |
| 365 | * |
| 366 | ************************************************************************** |
| 367 | */ |
| 368 | UWORD32 ih264d_parse_submb_type_cabac(const UWORD8 u1_slc_type_b, |
| 369 | decoding_envirnoment_t * ps_cab_env, |
| 370 | dec_bit_stream_t * ps_bitstrm, |
| 371 | bin_ctxt_model_t * ps_sub_mb_cxt) |
| 372 | { |
| 373 | WORD8 u1_sub_mb_type, u1_bin; |
| 374 | |
| 375 | INC_SYM_COUNT(ps_cab_env); |
| 376 | |
| 377 | u1_sub_mb_type = 0; |
| 378 | u1_bin = (UWORD8)ih264d_decode_bin(0, ps_sub_mb_cxt, ps_bitstrm, |
| 379 | ps_cab_env); |
| 380 | |
| 381 | if(u1_slc_type_b ^ u1_bin) |
| 382 | return 0; |
| 383 | |
| 384 | if(!u1_slc_type_b) |
| 385 | { |
| 386 | /* P Slice */ |
| 387 | u1_sub_mb_type = 1; |
| 388 | u1_bin = (UWORD8)ih264d_decode_bin(1, ps_sub_mb_cxt, ps_bitstrm, |
| 389 | ps_cab_env); |
| 390 | if(u1_bin == 1) |
| 391 | { |
| 392 | u1_bin = (UWORD8)ih264d_decode_bin(2, ps_sub_mb_cxt, ps_bitstrm, |
| 393 | ps_cab_env); |
| 394 | u1_sub_mb_type = (2 + (!u1_bin)); |
| 395 | } |
| 396 | |
| 397 | return u1_sub_mb_type; |
| 398 | } |
| 399 | else |
| 400 | { |
| 401 | /* B Slice */ |
| 402 | |
| 403 | /* b1 */ |
| 404 | u1_bin = (UWORD8)ih264d_decode_bin(1, ps_sub_mb_cxt, ps_bitstrm, |
| 405 | ps_cab_env); |
| 406 | if(u1_bin) |
| 407 | { |
| 408 | /* b2 */ |
| 409 | u1_bin = (UWORD8)ih264d_decode_bin(2, ps_sub_mb_cxt, ps_bitstrm, |
| 410 | ps_cab_env); |
| 411 | if(u1_bin) |
| 412 | { |
| 413 | /* b3 */ |
| 414 | u1_sub_mb_type = 7; |
| 415 | u1_bin = (UWORD8)ih264d_decode_bin(3, ps_sub_mb_cxt, ps_bitstrm, |
| 416 | ps_cab_env); |
| 417 | u1_sub_mb_type += u1_bin << 2; |
| 418 | u1_bin = !u1_bin; |
| 419 | /* b4 */ |
| 420 | if(u1_bin == 0) |
| 421 | { |
| 422 | u1_bin = ih264d_decode_bin(3, ps_sub_mb_cxt, ps_bitstrm, |
| 423 | ps_cab_env); |
| 424 | } |
| 425 | else |
| 426 | { |
| 427 | u1_bin = (UWORD8)ih264d_decode_bins(2, 0x33, ps_sub_mb_cxt, |
| 428 | ps_bitstrm, ps_cab_env); |
| 429 | } |
| 430 | |
| 431 | return (u1_sub_mb_type + u1_bin); |
| 432 | } |
| 433 | else |
| 434 | { |
| 435 | /* b3 */ |
| 436 | u1_bin = (UWORD8)ih264d_decode_bins(2, 0x33, ps_sub_mb_cxt, |
| 437 | ps_bitstrm, ps_cab_env); |
| 438 | return (3 + u1_bin); |
| 439 | } |
| 440 | } |
| 441 | else |
| 442 | { |
| 443 | /* b2 */ |
| 444 | u1_bin = (UWORD8)ih264d_decode_bin(3, ps_sub_mb_cxt, ps_bitstrm, |
| 445 | ps_cab_env); |
| 446 | return (1 + u1_bin); |
| 447 | } |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | /*! |
| 452 | ************************************************************************** |
| 453 | * \if Function name : ih264d_parse_ref_idx_cabac \endif |
| 454 | * |
| 455 | * \brief |
| 456 | * This function decodes Reference Index using CABAC entropy coding mode. |
| 457 | * |
| 458 | * \return |
| 459 | * None |
| 460 | * |
| 461 | ************************************************************************** |
| 462 | */ |
| 463 | WORD32 ih264d_parse_ref_idx_cabac(const UWORD8 u1_num_part, |
| 464 | const UWORD8 u1_b2, |
| 465 | const UWORD8 u1_max_ref_minus1, |
| 466 | const UWORD8 u1_mb_mode, |
| 467 | WORD8 * pi1_ref_idx, |
| 468 | WORD8 * const pi1_lft_cxt, |
| 469 | WORD8 * const pi1_top_cxt, |
| 470 | decoding_envirnoment_t * const ps_cab_env, |
| 471 | dec_bit_stream_t * const ps_bitstrm, |
| 472 | bin_ctxt_model_t * const ps_ref_cxt) |
| 473 | { |
| 474 | UWORD8 u1_a, u1_b; |
| 475 | UWORD32 u4_cxt_inc; |
| 476 | UWORD8 u1_blk_no, u1_i, u1_idx_lft, u1_idx_top; |
| 477 | WORD8 i1_ref_idx; |
| 478 | |
| 479 | for(u1_blk_no = 0, u1_i = 0; u1_i < u1_num_part; u1_i++, pi1_ref_idx++) |
| 480 | { |
| 481 | u1_idx_lft = ((u1_blk_no & 0x02) >> 1) + u1_b2; |
| 482 | u1_idx_top = (u1_blk_no & 0x01) + u1_b2; |
| 483 | i1_ref_idx = *pi1_ref_idx; |
| 484 | |
| 485 | if(i1_ref_idx > 0) |
| 486 | { |
| 487 | u1_a = pi1_lft_cxt[u1_idx_lft] > 0; |
| 488 | u1_b = pi1_top_cxt[u1_idx_top] > 0; |
| 489 | |
| 490 | u4_cxt_inc = u1_a + (u1_b << 1); |
| 491 | u4_cxt_inc = (u4_cxt_inc | 0x55540); |
| 492 | |
| 493 | i1_ref_idx = (WORD8)ih264d_decode_bins_unary(32, u4_cxt_inc, |
| 494 | ps_ref_cxt, ps_bitstrm, |
| 495 | ps_cab_env); |
| 496 | |
| 497 | if((i1_ref_idx > u1_max_ref_minus1) || (i1_ref_idx < 0)) |
| 498 | { |
| 499 | return ERROR_REF_IDX; |
| 500 | } |
| 501 | |
| 502 | *pi1_ref_idx = i1_ref_idx; |
| 503 | |
| 504 | INC_SYM_COUNT(ps_cab_env); |
| 505 | |
| 506 | } |
| 507 | |
| 508 | /* Storing Reference Idx Information */ |
| 509 | pi1_lft_cxt[u1_idx_lft] = i1_ref_idx; |
| 510 | pi1_top_cxt[u1_idx_top] = i1_ref_idx; |
| 511 | u1_blk_no = u1_blk_no + 1 + (u1_mb_mode & 0x01); |
| 512 | } |
| 513 | /* if(!u1_sub_mb) */ |
| 514 | if(u1_num_part != 4) |
| 515 | { |
| 516 | pi1_lft_cxt[(!(u1_mb_mode & 0x1)) + u1_b2] = pi1_lft_cxt[u1_b2]; |
| 517 | pi1_top_cxt[(!(u1_mb_mode & 0x2)) + u1_b2] = pi1_top_cxt[u1_b2]; |
| 518 | } |
| 519 | return OK; |
| 520 | } |
| 521 | |
| 522 | /*! |
| 523 | ************************************************************************** |
| 524 | * \if Function name : ih264d_parse_mb_qp_delta_cabac \endif |
| 525 | * |
| 526 | * \brief |
| 527 | * This function decodes MB Qp delta using CABAC entropy coding mode. |
| 528 | * |
| 529 | * \return |
| 530 | * None |
| 531 | * |
| 532 | ************************************************************************** |
| 533 | */ |
| 534 | WORD32 ih264d_parse_mb_qp_delta_cabac(struct _DecStruct * ps_dec, |
| 535 | WORD8 *pi1_mb_qp_delta) |
| 536 | { |
| 537 | decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env; |
| 538 | dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm; |
| 539 | |
| 540 | UWORD8 u1_code_num; |
| 541 | bin_ctxt_model_t *ps_mb_qp_delta_ctxt = ps_dec->p_mb_qp_delta_t; |
| 542 | UWORD32 u4_cxt_inc; |
| 543 | |
| 544 | INC_SYM_COUNT(ps_cab_env); |
| 545 | |
| 546 | u4_cxt_inc = (!(!(ps_dec->i1_prev_mb_qp_delta))); |
| 547 | |
| 548 | u1_code_num = 0; |
| 549 | u4_cxt_inc = (u4_cxt_inc | 0x33320); |
| 550 | /* max number of bins = 53, |
| 551 | since Range for MbQpDelta= -26 to +25 inclusive, UNARY code */ |
| 552 | u1_code_num = ih264d_decode_bins_unary(32, u4_cxt_inc, ps_mb_qp_delta_ctxt, |
| 553 | ps_bitstrm, ps_cab_env); |
| 554 | if(u1_code_num == 32) |
| 555 | { |
| 556 | /* Read remaining 21 bins */ |
| 557 | UWORD8 uc_codeNumX; |
| 558 | u4_cxt_inc = 0x33333; |
| 559 | uc_codeNumX = ih264d_decode_bins_unary(21, u4_cxt_inc, ps_mb_qp_delta_ctxt, |
| 560 | ps_bitstrm, ps_cab_env); |
| 561 | u1_code_num = u1_code_num + uc_codeNumX; |
| 562 | } |
| 563 | |
| 564 | *pi1_mb_qp_delta = (u1_code_num + 1) >> 1; |
| 565 | /* Table 9.3: If code_num is even Syntax Element has -ve value */ |
| 566 | if(!(u1_code_num & 0x01)) |
| 567 | *pi1_mb_qp_delta = -(*pi1_mb_qp_delta); |
| 568 | |
| 569 | /* Range of MbQpDelta= -26 to +25 inclusive */ |
| 570 | if((*pi1_mb_qp_delta < -26) || (*pi1_mb_qp_delta > 25)) |
| 571 | return ERROR_INV_RANGE_QP_T; |
| 572 | ps_dec->i1_prev_mb_qp_delta = *pi1_mb_qp_delta; |
| 573 | return OK; |
| 574 | } |
| 575 | /*! |
| 576 | ************************************************************************** |
| 577 | * \if Function name : ih264d_parse_chroma_pred_mode_cabac \endif |
| 578 | * |
| 579 | * \brief |
| 580 | * This function decodes Chroma Pred mode using CABAC entropy coding mode. |
| 581 | * |
| 582 | * \return |
| 583 | * None |
| 584 | * |
| 585 | ************************************************************************** |
| 586 | */ |
| 587 | WORD8 ih264d_parse_chroma_pred_mode_cabac(struct _DecStruct * ps_dec) |
| 588 | { |
| 589 | decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env; |
| 590 | dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm; |
| 591 | ctxt_inc_mb_info_t * ps_left_ctxt = ps_dec->p_left_ctxt_mb_info; |
| 592 | ctxt_inc_mb_info_t * ps_top_ctxt = ps_dec->p_top_ctxt_mb_info; |
| 593 | WORD8 i1_chroma_pred_mode, a, b; |
| 594 | UWORD32 u4_cxt_inc; |
| 595 | |
| 596 | INC_SYM_COUNT(ps_cab_env); |
| 597 | |
| 598 | /* Binarization is TU and Cmax=3 */ |
| 599 | i1_chroma_pred_mode = 0; |
| 600 | a = 0; |
| 601 | b = 0; |
| 602 | |
| 603 | a = ((ps_left_ctxt->u1_intra_chroma_pred_mode != 0) ? 1 : 0); |
| 604 | |
| 605 | b = ((ps_top_ctxt->u1_intra_chroma_pred_mode != 0) ? 1 : 0); |
| 606 | u4_cxt_inc = a + b; |
| 607 | |
| 608 | u4_cxt_inc = (u4_cxt_inc | 0x330); |
| 609 | |
| 610 | i1_chroma_pred_mode = ih264d_decode_bins_tunary( |
| 611 | 3, u4_cxt_inc, ps_dec->p_intra_chroma_pred_mode_t, |
| 612 | ps_bitstrm, ps_cab_env); |
| 613 | |
| 614 | return (i1_chroma_pred_mode); |
| 615 | } |
| 616 | |
| 617 | /*****************************************************************************/ |
| 618 | /* */ |
| 619 | /* Function Name : ih264d_parse_transform8x8flag_cabac */ |
| 620 | /* */ |
| 621 | /* Description : */ |
| 622 | /* Inputs : */ |
| 623 | /* */ |
| 624 | /* */ |
| 625 | /* Returns : */ |
| 626 | /* */ |
| 627 | /* Revision History: */ |
| 628 | /* */ |
| 629 | /* DD MM YYYY Author(s) Changes (Describe the changes made) */ |
| 630 | /* Rajasekhar Creation */ |
| 631 | /* */ |
| 632 | /*****************************************************************************/ |
| 633 | UWORD8 ih264d_parse_transform8x8flag_cabac(struct _DecStruct * ps_dec, |
| 634 | dec_mb_info_t * ps_cur_mb_info) |
| 635 | { |
| 636 | decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env; |
| 637 | dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm; |
| 638 | ctxt_inc_mb_info_t * ps_left_ctxt = ps_dec->p_left_ctxt_mb_info; |
| 639 | ctxt_inc_mb_info_t * ps_top_ctxt = ps_dec->p_top_ctxt_mb_info; |
| 640 | UWORD8 u1_transform_8x8flag; |
| 641 | UWORD8 u1_mb_ngbr_avail = ps_cur_mb_info->u1_mb_ngbr_availablity; |
| 642 | |
| 643 | WORD8 a, b; |
| 644 | UWORD32 u4_cxt_inc; |
| 645 | |
| 646 | /* for calculating the context increment for transform8x8 u4_flag */ |
| 647 | /* it reads transform8x8 u4_flag of the neighbors through */ |
| 648 | |
| 649 | /* Binarization is FLC */ |
| 650 | a = 0; |
| 651 | b = 0; |
| 652 | |
| 653 | if(u1_mb_ngbr_avail & LEFT_MB_AVAILABLE_MASK) |
| 654 | { |
| 655 | a = ps_left_ctxt->u1_transform8x8_ctxt; |
| 656 | } |
| 657 | if(u1_mb_ngbr_avail & TOP_MB_AVAILABLE_MASK) |
| 658 | { |
| 659 | b = ps_top_ctxt->u1_transform8x8_ctxt; |
| 660 | |
| 661 | } |
| 662 | |
| 663 | u4_cxt_inc = a + b; |
| 664 | |
| 665 | u1_transform_8x8flag = ih264d_decode_bin( |
| 666 | u4_cxt_inc, ps_dec->s_high_profile.ps_transform8x8_flag, |
| 667 | ps_bitstrm, ps_cab_env); |
| 668 | |
| 669 | return (u1_transform_8x8flag); |
| 670 | } |
| 671 | |
| 672 | /*! |
| 673 | ************************************************************************** |
| 674 | * \if Function name : ih264d_read_intra_pred_modes_cabac \endif |
| 675 | * |
| 676 | * \brief |
| 677 | * Reads the intra pred mode related values of I4x4 MB from bitstream. |
| 678 | * |
| 679 | * This function will read the prev intra pred mode flags and |
| 680 | * stores it in pu1_prev_intra4x4_pred_mode_flag. If the u4_flag |
| 681 | * indicates that most probable mode is not intra pred mode, then |
| 682 | * the rem_intra4x4_pred_mode is read and stored in |
| 683 | * pu1_rem_intra4x4_pred_mode array. |
| 684 | * |
| 685 | * |
| 686 | * \return |
| 687 | * 0 on success and Error code otherwise |
| 688 | * |
| 689 | ************************************************************************** |
| 690 | */ |
| 691 | WORD32 ih264d_read_intra_pred_modes_cabac(dec_struct_t * ps_dec, |
| 692 | UWORD8 * pu1_prev_intra4x4_pred_mode_flag, |
| 693 | UWORD8 * pu1_rem_intra4x4_pred_mode, |
| 694 | UWORD8 u1_tran_form8x8) |
| 695 | { |
| 696 | WORD32 i4x4_luma_blk_idx = 0; |
| 697 | dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm; |
| 698 | decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env; |
| 699 | bin_ctxt_model_t *ps_ctxt_ipred_luma_mpm, *ps_ctx_ipred_luma_rm; |
| 700 | WORD32 i4_rem_intra4x4_pred_mode; |
| 701 | UWORD32 u4_prev_intra4x4_pred_mode_flag; |
| 702 | UWORD32 u4_code_int_range, u4_code_int_val_ofst; |
| 703 | const UWORD32 *pu4_table = (const UWORD32 *)ps_cab_env->cabac_table; |
| 704 | |
| 705 | ps_ctxt_ipred_luma_mpm = ps_dec->p_prev_intra4x4_pred_mode_flag_t; |
| 706 | ps_ctx_ipred_luma_rm = ps_dec->p_rem_intra4x4_pred_mode_t; |
| 707 | SWITCHOFFTRACE; |
| 708 | |
| 709 | i4x4_luma_blk_idx = (0 == u1_tran_form8x8) ? 16 : 4; |
| 710 | |
| 711 | u4_code_int_range = ps_cab_env->u4_code_int_range; |
| 712 | u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst; |
| 713 | |
| 714 | do |
| 715 | { |
| 716 | |
| 717 | DECODE_ONE_BIN_MACRO(ps_ctxt_ipred_luma_mpm, u4_code_int_range, |
| 718 | u4_code_int_val_ofst, pu4_table, ps_bitstrm, |
| 719 | u4_prev_intra4x4_pred_mode_flag) |
| 720 | *pu1_prev_intra4x4_pred_mode_flag = u4_prev_intra4x4_pred_mode_flag; |
| 721 | |
| 722 | i4_rem_intra4x4_pred_mode = -1; |
| 723 | if(!u4_prev_intra4x4_pred_mode_flag) |
| 724 | { |
| 725 | |
| 726 | /*inlining DecodeDecisionBins_FLC*/ |
| 727 | |
| 728 | { |
| 729 | |
| 730 | UWORD8 u1_max_bins = 3; |
| 731 | UWORD32 u4_value; |
| 732 | UWORD32 u4_symbol, i; |
| 733 | |
| 734 | i = 0; |
| 735 | u4_value = 0; |
| 736 | |
| 737 | do |
| 738 | { |
| 739 | |
| 740 | DECODE_ONE_BIN_MACRO(ps_ctx_ipred_luma_rm, u4_code_int_range, |
| 741 | u4_code_int_val_ofst, pu4_table, |
| 742 | ps_bitstrm, u4_symbol) |
| 743 | |
| 744 | INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(ps_cab_env); |
| 745 | |
| 746 | u4_value = u4_value | (u4_symbol << i); |
| 747 | |
| 748 | i++; |
| 749 | } |
| 750 | while(i < u1_max_bins); |
| 751 | |
| 752 | i4_rem_intra4x4_pred_mode = (u4_value); |
| 753 | |
| 754 | } |
| 755 | |
| 756 | } |
| 757 | |
| 758 | (*pu1_rem_intra4x4_pred_mode) = i4_rem_intra4x4_pred_mode; |
| 759 | |
| 760 | COPYTHECONTEXT("intra4x4_pred_mode", i4_rem_intra4x4_pred_mode); |
| 761 | |
| 762 | pu1_prev_intra4x4_pred_mode_flag++; |
| 763 | pu1_rem_intra4x4_pred_mode++; |
| 764 | |
| 765 | i4x4_luma_blk_idx--; |
| 766 | } |
| 767 | while(i4x4_luma_blk_idx); |
| 768 | |
| 769 | ps_cab_env->u4_code_int_range = u4_code_int_range; |
| 770 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 771 | |
| 772 | return (0); |
| 773 | |
| 774 | } |
| 775 | |
| 776 | /*! |
| 777 | ************************************************************************** |
| 778 | * \if Function name : ih264d_parse_ctx_cbp_cabac \endif |
| 779 | * |
| 780 | * \brief |
| 781 | * This function decodes CtxCbpLuma and CtxCbpChroma (CBP of a Macroblock). |
| 782 | * using CABAC entropy coding mode. |
| 783 | * |
| 784 | * \return |
| 785 | * CBP of a MB. |
| 786 | * |
| 787 | ************************************************************************** |
| 788 | */ |
| 789 | UWORD32 ih264d_parse_ctx_cbp_cabac(struct _DecStruct * ps_dec) |
| 790 | { |
| 791 | |
| 792 | UWORD32 u4_cxt_inc; |
| 793 | decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env; |
| 794 | dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm; |
| 795 | ctxt_inc_mb_info_t * ps_left_ctxt = ps_dec->p_left_ctxt_mb_info; |
| 796 | ctxt_inc_mb_info_t * ps_top_ctxt = ps_dec->p_top_ctxt_mb_info; |
| 797 | bin_ctxt_model_t *ps_ctxt_cbp_luma = ps_dec->p_cbp_luma_t, *ps_bin_ctxt; |
| 798 | WORD8 c_Cbp; //,i,j; |
| 799 | UWORD32 u4_code_int_range, u4_code_int_val_ofst; |
| 800 | UWORD32 u4_offset, *pu4_buffer; |
| 801 | const UWORD32 *pu4_table = (const UWORD32 *)ps_cab_env->cabac_table; |
| 802 | |
| 803 | INC_SYM_COUNT(ps_cab_env); |
| 804 | |
| 805 | |
| 806 | |
| 807 | /* CBP Luma, FL, Cmax = 15, L = 4 */ |
| 808 | u4_cxt_inc = (!((ps_top_ctxt->u1_cbp >> 2) & 0x01)) << 1; |
| 809 | u4_cxt_inc += !((ps_left_ctxt->u1_cbp >> 1) & 0x01); |
| 810 | |
| 811 | u4_offset = ps_bitstrm->u4_ofst; |
| 812 | pu4_buffer = ps_bitstrm->pu4_buffer; |
| 813 | |
| 814 | u4_code_int_range = ps_cab_env->u4_code_int_range; |
| 815 | u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst; |
| 816 | /*renormalize to ensure there 23 bits more in the u4_code_int_val_ofst*/ |
| 817 | { |
| 818 | UWORD32 u4_clz, read_bits; |
| 819 | |
| 820 | u4_clz = CLZ(u4_code_int_range); |
| 821 | FLUSHBITS(u4_offset, u4_clz) |
| 822 | NEXTBITS(read_bits, u4_offset, pu4_buffer, 23) |
| 823 | u4_code_int_range = u4_code_int_range << u4_clz; |
| 824 | u4_code_int_val_ofst = (u4_code_int_val_ofst << u4_clz) | read_bits; |
| 825 | } |
| 826 | |
| 827 | ps_bin_ctxt = ps_ctxt_cbp_luma + u4_cxt_inc; |
| 828 | |
| 829 | /*inlining DecodeDecision_onebin without renorm*/ |
| 830 | { |
| 831 | |
| 832 | UWORD32 u4_qnt_int_range, u4_int_range_lps; |
| 833 | UWORD32 u4_symbol, u1_mps_state; |
| 834 | UWORD32 table_lookup; |
| 835 | UWORD32 u4_clz; |
| 836 | |
| 837 | u1_mps_state = (ps_bin_ctxt->u1_mps_state); |
| 838 | |
| 839 | u4_clz = CLZ(u4_code_int_range); |
| 840 | u4_qnt_int_range = u4_code_int_range << u4_clz; |
| 841 | u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3; |
| 842 | |
| 843 | table_lookup = pu4_table[(u1_mps_state << 2) + u4_qnt_int_range]; |
| 844 | u4_int_range_lps = table_lookup & 0xff; |
| 845 | |
| 846 | u4_int_range_lps = u4_int_range_lps << (23 - u4_clz); |
| 847 | u4_code_int_range = u4_code_int_range - u4_int_range_lps; |
| 848 | |
| 849 | u4_symbol = ((u1_mps_state >> 6) & 0x1); |
| 850 | |
| 851 | /*if mps*/ |
| 852 | u1_mps_state = (table_lookup >> 8) & 0x7F; |
| 853 | |
| 854 | CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst, u4_symbol, |
| 855 | u4_int_range_lps, u1_mps_state, table_lookup) |
| 856 | |
| 857 | INC_BIN_COUNT(ps_cab_env); |
| 858 | |
| 859 | ps_bin_ctxt->u1_mps_state = u1_mps_state; |
| 860 | |
| 861 | c_Cbp = u4_symbol; |
| 862 | |
| 863 | } |
| 864 | |
| 865 | u4_cxt_inc = (!((ps_top_ctxt->u1_cbp >> 3) & 0x01)) << 1; |
| 866 | u4_cxt_inc += !(c_Cbp & 0x01); |
| 867 | ps_bin_ctxt = ps_ctxt_cbp_luma + u4_cxt_inc; |
| 868 | /*inlining DecodeDecision_onebin without renorm*/ |
| 869 | |
| 870 | { |
| 871 | |
| 872 | UWORD32 u4_qnt_int_range, u4_int_range_lps; |
| 873 | UWORD32 u4_symbol, u1_mps_state; |
| 874 | UWORD32 table_lookup; |
| 875 | UWORD32 u4_clz; |
| 876 | |
| 877 | u1_mps_state = (ps_bin_ctxt->u1_mps_state); |
| 878 | |
| 879 | u4_clz = CLZ(u4_code_int_range); |
| 880 | u4_qnt_int_range = u4_code_int_range << u4_clz; |
| 881 | u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3; |
| 882 | |
| 883 | table_lookup = pu4_table[(u1_mps_state << 2) + u4_qnt_int_range]; |
| 884 | u4_int_range_lps = table_lookup & 0xff; |
| 885 | |
| 886 | u4_int_range_lps = u4_int_range_lps << (23 - u4_clz); |
| 887 | u4_code_int_range = u4_code_int_range - u4_int_range_lps; |
| 888 | |
| 889 | u4_symbol = ((u1_mps_state >> 6) & 0x1); |
| 890 | |
| 891 | /*if mps*/ |
| 892 | u1_mps_state = (table_lookup >> 8) & 0x7F; |
| 893 | |
| 894 | CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst, u4_symbol, |
| 895 | u4_int_range_lps, u1_mps_state, table_lookup) |
| 896 | |
| 897 | INC_BIN_COUNT(ps_cab_env); |
| 898 | |
| 899 | ps_bin_ctxt->u1_mps_state = u1_mps_state; |
| 900 | |
| 901 | c_Cbp |= u4_symbol << 1; |
| 902 | |
| 903 | } |
| 904 | |
| 905 | u4_cxt_inc = (!(c_Cbp & 0x01)) << 1; |
| 906 | u4_cxt_inc += !((ps_left_ctxt->u1_cbp >> 3) & 0x01); |
| 907 | ps_bin_ctxt = ps_ctxt_cbp_luma + u4_cxt_inc; |
| 908 | /*inlining DecodeDecision_onebin without renorm*/ |
| 909 | |
| 910 | { |
| 911 | |
| 912 | UWORD32 u4_qnt_int_range, u4_int_range_lps; |
| 913 | UWORD32 u4_symbol, u1_mps_state; |
| 914 | UWORD32 table_lookup; |
| 915 | UWORD32 u4_clz; |
| 916 | |
| 917 | u1_mps_state = (ps_bin_ctxt->u1_mps_state); |
| 918 | |
| 919 | u4_clz = CLZ(u4_code_int_range); |
| 920 | u4_qnt_int_range = u4_code_int_range << u4_clz; |
| 921 | u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3; |
| 922 | |
| 923 | table_lookup = pu4_table[(u1_mps_state << 2) + u4_qnt_int_range]; |
| 924 | u4_int_range_lps = table_lookup & 0xff; |
| 925 | |
| 926 | u4_int_range_lps = u4_int_range_lps << (23 - u4_clz); |
| 927 | u4_code_int_range = u4_code_int_range - u4_int_range_lps; |
| 928 | |
| 929 | u4_symbol = ((u1_mps_state >> 6) & 0x1); |
| 930 | |
| 931 | /*if mps*/ |
| 932 | u1_mps_state = (table_lookup >> 8) & 0x7F; |
| 933 | |
| 934 | CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst, u4_symbol, |
| 935 | u4_int_range_lps, u1_mps_state, table_lookup) |
| 936 | |
| 937 | INC_BIN_COUNT(ps_cab_env); |
| 938 | |
| 939 | ps_bin_ctxt->u1_mps_state = u1_mps_state; |
| 940 | |
| 941 | c_Cbp |= u4_symbol << 2; |
| 942 | |
| 943 | } |
| 944 | |
| 945 | u4_cxt_inc = (!((c_Cbp >> 1) & 0x01)) << 1; |
| 946 | u4_cxt_inc += !((c_Cbp >> 2) & 0x01); |
| 947 | ps_bin_ctxt = ps_ctxt_cbp_luma + u4_cxt_inc; |
| 948 | /*inlining DecodeDecision_onebin without renorm*/ |
| 949 | |
| 950 | { |
| 951 | |
| 952 | UWORD32 u4_qnt_int_range, u4_int_range_lps; |
| 953 | UWORD32 u4_symbol, u1_mps_state; |
| 954 | UWORD32 table_lookup; |
| 955 | UWORD32 u4_clz; |
| 956 | |
| 957 | u1_mps_state = (ps_bin_ctxt->u1_mps_state); |
| 958 | |
| 959 | u4_clz = CLZ(u4_code_int_range); |
| 960 | u4_qnt_int_range = u4_code_int_range << u4_clz; |
| 961 | u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3; |
| 962 | |
| 963 | table_lookup = pu4_table[(u1_mps_state << 2) + u4_qnt_int_range]; |
| 964 | u4_int_range_lps = table_lookup & 0xff; |
| 965 | |
| 966 | u4_int_range_lps = u4_int_range_lps << (23 - u4_clz); |
| 967 | u4_code_int_range = u4_code_int_range - u4_int_range_lps; |
| 968 | |
| 969 | u4_symbol = ((u1_mps_state >> 6) & 0x1); |
| 970 | |
| 971 | /*if mps*/ |
| 972 | u1_mps_state = (table_lookup >> 8) & 0x7F; |
| 973 | |
| 974 | CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst, u4_symbol, |
| 975 | u4_int_range_lps, u1_mps_state, table_lookup) |
| 976 | |
| 977 | INC_BIN_COUNT(ps_cab_env); |
| 978 | |
| 979 | ps_bin_ctxt->u1_mps_state = u1_mps_state; |
| 980 | |
| 981 | c_Cbp |= u4_symbol << 3; |
| 982 | |
| 983 | } |
| 984 | |
| 985 | if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_8) |
| 986 | { |
| 987 | |
| 988 | RENORM_RANGE_OFFSET(u4_code_int_range, u4_code_int_val_ofst, u4_offset, |
| 989 | pu4_buffer) |
| 990 | |
| 991 | } |
| 992 | |
| 993 | { |
| 994 | UWORD32 u4_cxt_inc; |
| 995 | WORD8 a, b, c, d; |
| 996 | bin_ctxt_model_t *p_CtxtCbpChroma = ps_dec->p_cbp_chroma_t; |
| 997 | |
| 998 | /* CBP Chroma, TU, Cmax = 2 */ |
| 999 | a = 0; |
| 1000 | b = 0; |
| 1001 | c = 0; |
| 1002 | d = 0; |
| 1003 | |
| 1004 | { |
| 1005 | a = (ps_top_ctxt->u1_cbp > 15) ? 2 : 0; |
| 1006 | c = (ps_top_ctxt->u1_cbp > 31) ? 2 : 0; |
| 1007 | } |
| 1008 | |
| 1009 | { |
| 1010 | b = (ps_left_ctxt->u1_cbp > 15) ? 1 : 0; |
| 1011 | d = (ps_left_ctxt->u1_cbp > 31) ? 1 : 0; |
| 1012 | } |
| 1013 | u4_cxt_inc = a + b; |
| 1014 | u4_cxt_inc = (u4_cxt_inc | ((4 + c + d) << 4)); |
| 1015 | |
| 1016 | /*inlining ih264d_decode_bins_tunary */ |
| 1017 | |
| 1018 | { |
| 1019 | |
| 1020 | UWORD8 u1_max_bins = 2; |
| 1021 | UWORD32 u4_ctx_inc = u4_cxt_inc; |
| 1022 | |
| 1023 | UWORD32 u4_value; |
| 1024 | UWORD32 u4_symbol; |
| 1025 | UWORD8 u4_ctx_Inc; |
| 1026 | bin_ctxt_model_t *ps_bin_ctxt; |
| 1027 | u4_value = 0; |
| 1028 | |
| 1029 | do |
| 1030 | { |
| 1031 | u4_ctx_Inc = u4_ctx_inc & 0xF; |
| 1032 | u4_ctx_inc = u4_ctx_inc >> 4; |
| 1033 | |
| 1034 | ps_bin_ctxt = p_CtxtCbpChroma + u4_ctx_Inc; |
| 1035 | /*inlining DecodeDecision_onebin*/ |
| 1036 | { |
| 1037 | |
| 1038 | UWORD32 u4_qnt_int_range, u4_int_range_lps; |
| 1039 | |
| 1040 | UWORD32 u1_mps_state; |
| 1041 | UWORD32 table_lookup; |
| 1042 | UWORD32 u4_clz; |
| 1043 | |
| 1044 | u1_mps_state = (ps_bin_ctxt->u1_mps_state); |
| 1045 | |
| 1046 | u4_clz = CLZ(u4_code_int_range); |
| 1047 | u4_qnt_int_range = u4_code_int_range << u4_clz; |
| 1048 | u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3; |
| 1049 | |
| 1050 | table_lookup = pu4_table[(u1_mps_state << 2) |
| 1051 | + u4_qnt_int_range]; |
| 1052 | u4_int_range_lps = table_lookup & 0xff; |
| 1053 | |
| 1054 | u4_int_range_lps = u4_int_range_lps << (23 - u4_clz); |
| 1055 | u4_code_int_range = u4_code_int_range - u4_int_range_lps; |
| 1056 | |
| 1057 | u4_symbol = ((u1_mps_state >> 6) & 0x1); |
| 1058 | |
| 1059 | /*if mps*/ |
| 1060 | u1_mps_state = (table_lookup >> 8) & 0x7F; |
| 1061 | |
| 1062 | CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst, |
| 1063 | u4_symbol, u4_int_range_lps, u1_mps_state, |
| 1064 | table_lookup) |
| 1065 | |
| 1066 | if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_8) |
| 1067 | { |
| 1068 | RENORM_RANGE_OFFSET(u4_code_int_range, |
| 1069 | u4_code_int_val_ofst, u4_offset, |
| 1070 | pu4_buffer) |
| 1071 | } |
| 1072 | ps_bin_ctxt->u1_mps_state = u1_mps_state; |
| 1073 | } |
| 1074 | |
| 1075 | INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS( |
| 1076 | ps_cab_env); |
| 1077 | |
| 1078 | u4_value++; |
| 1079 | } |
| 1080 | while((u4_value < u1_max_bins) & (u4_symbol)); |
| 1081 | |
| 1082 | u4_value = u4_value - 1 + u4_symbol; |
| 1083 | |
| 1084 | a = (u4_value); |
| 1085 | |
| 1086 | } |
| 1087 | |
| 1088 | c_Cbp = (c_Cbp | (a << 4)); |
| 1089 | } |
| 1090 | |
| 1091 | ps_bitstrm->u4_ofst = u4_offset; |
| 1092 | |
| 1093 | ps_cab_env->u4_code_int_range = u4_code_int_range; |
| 1094 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 1095 | |
| 1096 | return (c_Cbp); |
| 1097 | } |
| 1098 | |
| 1099 | /*! |
| 1100 | ************************************************************************** |
| 1101 | * \if Function name : ih264d_get_mvd_cabac \endif |
| 1102 | * |
| 1103 | * \brief |
| 1104 | * This function decodes Horz and Vert mvd_l0 and mvd_l1 using CABAC entropy |
| 1105 | * coding mode as defined in 9.3.2.3. |
| 1106 | * |
| 1107 | * \return |
| 1108 | * None |
| 1109 | * |
| 1110 | ************************************************************************** |
| 1111 | */ |
| 1112 | void ih264d_get_mvd_cabac(UWORD8 u1_sub_mb, |
| 1113 | UWORD8 u1_b2, |
| 1114 | UWORD8 u1_part_wd, |
| 1115 | UWORD8 u1_part_ht, |
| 1116 | UWORD8 u1_dec_mvd, |
| 1117 | dec_struct_t *ps_dec, |
| 1118 | mv_pred_t *ps_mv) |
| 1119 | { |
| 1120 | UWORD8 u1_abs_mvd_x = 0, u1_abs_mvd_y = 0; |
| 1121 | UWORD8 u1_sub_mb_x, u1_sub_mb_y; |
| 1122 | UWORD8 *pu1_top_mv_ctxt, *pu1_lft_mv_ctxt; |
| 1123 | WORD16 *pi2_mv; |
| 1124 | |
| 1125 | u1_sub_mb_x = (UWORD8)(u1_sub_mb & 0x03); |
| 1126 | u1_sub_mb_y = (UWORD8)(u1_sub_mb >> 2); |
| 1127 | pu1_top_mv_ctxt = &ps_dec->ps_curr_ctxt_mb_info->u1_mv[u1_sub_mb_x][u1_b2]; |
| 1128 | pu1_lft_mv_ctxt = &ps_dec->pu1_left_mv_ctxt_inc[u1_sub_mb_y][u1_b2]; |
| 1129 | pi2_mv = &ps_mv->i2_mv[u1_b2]; |
| 1130 | |
| 1131 | if(u1_dec_mvd) |
| 1132 | { |
| 1133 | WORD16 i2_mv_x, i2_mv_y; |
| 1134 | WORD32 i2_temp; |
| 1135 | { |
| 1136 | decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env; |
| 1137 | dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm; |
| 1138 | UWORD16 u2_abs_mvd_x_a, u2_abs_mvd_x_b, u2_abs_mvd_y_a, |
| 1139 | u2_abs_mvd_y_b; |
| 1140 | |
| 1141 | u2_abs_mvd_x_b = (UWORD16)pu1_top_mv_ctxt[0]; |
| 1142 | u2_abs_mvd_y_b = (UWORD16)pu1_top_mv_ctxt[1]; |
| 1143 | u2_abs_mvd_x_a = (UWORD16)pu1_lft_mv_ctxt[0]; |
| 1144 | u2_abs_mvd_y_a = (UWORD16)pu1_lft_mv_ctxt[1]; |
| 1145 | |
| 1146 | i2_temp = u2_abs_mvd_x_a + u2_abs_mvd_x_b; |
| 1147 | |
| 1148 | i2_mv_x = ih264d_parse_mvd_cabac(ps_bitstrm, ps_cab_env, |
| 1149 | ps_dec->p_mvd_x_t, i2_temp); |
| 1150 | |
| 1151 | i2_temp = u2_abs_mvd_y_a + u2_abs_mvd_y_b; |
| 1152 | |
| 1153 | i2_mv_y = ih264d_parse_mvd_cabac(ps_bitstrm, ps_cab_env, |
| 1154 | ps_dec->p_mvd_y_t, i2_temp); |
| 1155 | } |
| 1156 | |
| 1157 | /***********************************************************************/ |
| 1158 | /* Store the abs_mvd_values in cabac contexts */ |
| 1159 | /* The follownig code can be easily optimzed if mvX, mvY clip values */ |
| 1160 | /* are packed in 16 bits follwed by memcpy */ |
| 1161 | /***********************************************************************/ |
| 1162 | u1_abs_mvd_x = CLIP3(0, 127, ABS(i2_mv_x)); |
| 1163 | u1_abs_mvd_y = CLIP3(0, 127, ABS(i2_mv_y)); |
| 1164 | |
| 1165 | COPYTHECONTEXT("MVD", i2_mv_x);COPYTHECONTEXT("MVD", i2_mv_y); |
| 1166 | |
| 1167 | /* Storing Mv residuals */ |
| 1168 | pi2_mv[0] = i2_mv_x; |
| 1169 | pi2_mv[1] = i2_mv_y; |
| 1170 | } |
| 1171 | |
| 1172 | /***************************************************************/ |
| 1173 | /* Store abs_mvd_values cabac contexts */ |
| 1174 | /***************************************************************/ |
Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame] | 1175 | { |
| 1176 | UWORD8 u1_i; |
| 1177 | for(u1_i = 0; u1_i < u1_part_wd; u1_i++, pu1_top_mv_ctxt += 4) |
| 1178 | { |
| 1179 | pu1_top_mv_ctxt[0] = u1_abs_mvd_x; |
| 1180 | pu1_top_mv_ctxt[1] = u1_abs_mvd_y; |
| 1181 | } |
| 1182 | |
| 1183 | for(u1_i = 0; u1_i < u1_part_ht; u1_i++, pu1_lft_mv_ctxt += 4) |
| 1184 | { |
| 1185 | pu1_lft_mv_ctxt[0] = u1_abs_mvd_x; |
| 1186 | pu1_lft_mv_ctxt[1] = u1_abs_mvd_y; |
| 1187 | } |
| 1188 | } |
Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame] | 1189 | } |
| 1190 | |
| 1191 | /*****************************************************************************/ |
| 1192 | /* */ |
| 1193 | /* Function Name : ih264d_parse_mvd_cabac */ |
| 1194 | /* */ |
| 1195 | /* Description : This cabac function decodes the mvd in a given direction */ |
| 1196 | /* direction ( x or y ) as defined in 9.3.2.3. */ |
| 1197 | /* */ |
| 1198 | /* Inputs : 1. pointer to Bitstream */ |
| 1199 | /* 2. pointer to cabac decoding environmnet */ |
| 1200 | /* 3. pointer to Mvd context */ |
| 1201 | /* 4. abs(Top mvd) = u2_abs_mvd_b */ |
| 1202 | /* 5. abs(left mvd)= u2_abs_mvd_a */ |
| 1203 | /* */ |
| 1204 | /* Processing : see section 9.3.2.3 of the standard */ |
| 1205 | /* */ |
| 1206 | /* Outputs : i2_mvd */ |
| 1207 | /* Returns : i2_mvd */ |
| 1208 | /* */ |
| 1209 | /* Issues : none */ |
| 1210 | /* */ |
| 1211 | /* Revision History: */ |
| 1212 | /* */ |
| 1213 | /* DD MM YYYY Author(s) Changes (Describe the changes made) */ |
| 1214 | /* 16 06 2005 Jay Draft */ |
| 1215 | /* */ |
| 1216 | /*****************************************************************************/ |
| 1217 | WORD16 ih264d_parse_mvd_cabac(dec_bit_stream_t * ps_bitstrm, |
| 1218 | decoding_envirnoment_t * ps_cab_env, |
| 1219 | bin_ctxt_model_t * p_ctxt_mvd, |
| 1220 | UWORD32 i4_temp) |
| 1221 | |
| 1222 | { |
| 1223 | WORD8 k; |
| 1224 | WORD16 i2_suf; |
| 1225 | WORD16 i2_mvd; |
| 1226 | UWORD16 u2_abs_mvd; |
| 1227 | UWORD32 u4_ctx_inc; |
| 1228 | UWORD32 u4_prefix; |
| 1229 | const UWORD32 *pu4_table = (const UWORD32 *)ps_cab_env->cabac_table; |
| 1230 | UWORD32 u4_code_int_range, u4_code_int_val_ofst; |
| 1231 | |
| 1232 | /* if mvd < 9 */ |
| 1233 | /* mvd = Prefix */ |
| 1234 | /* else */ |
| 1235 | /* mvd = Prefix + Suffix */ |
| 1236 | /* decode sign bit */ |
| 1237 | /* Prefix TU decoding Cmax =Ucoff and Suffix 3rd order Exp-Golomb */ |
| 1238 | |
| 1239 | u2_abs_mvd = (UWORD16)i4_temp; |
| 1240 | u4_ctx_inc = 1; |
| 1241 | |
| 1242 | if(u2_abs_mvd < 3) |
| 1243 | u4_ctx_inc = 0; |
| 1244 | else if(u2_abs_mvd > 32) |
| 1245 | u4_ctx_inc = 2; |
| 1246 | |
| 1247 | u4_ctx_inc = (u4_ctx_inc | 0x65430); |
| 1248 | |
| 1249 | /*inlining modified version of ih264d_decode_bins_unary*/ |
| 1250 | |
| 1251 | { |
| 1252 | UWORD8 u1_max_bins = 9; |
| 1253 | UWORD32 u4_value; |
| 1254 | UWORD32 u4_symbol; |
| 1255 | bin_ctxt_model_t *ps_bin_ctxt; |
| 1256 | UWORD32 u4_ctx_Inc; |
| 1257 | |
| 1258 | u4_value = 0; |
| 1259 | u4_code_int_range = ps_cab_env->u4_code_int_range; |
| 1260 | u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst; |
| 1261 | |
| 1262 | do |
| 1263 | { |
| 1264 | u4_ctx_Inc = u4_ctx_inc & 0xf; |
| 1265 | u4_ctx_inc = u4_ctx_inc >> 4; |
| 1266 | |
| 1267 | ps_bin_ctxt = p_ctxt_mvd + u4_ctx_Inc; |
| 1268 | |
| 1269 | DECODE_ONE_BIN_MACRO(ps_bin_ctxt, u4_code_int_range, |
| 1270 | u4_code_int_val_ofst, pu4_table, ps_bitstrm, |
| 1271 | u4_symbol) |
| 1272 | |
| 1273 | INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(ps_cab_env); |
| 1274 | |
| 1275 | u4_value++; |
| 1276 | |
| 1277 | } |
| 1278 | while(u4_symbol && u4_value < 5); |
| 1279 | |
| 1280 | ps_bin_ctxt = p_ctxt_mvd + 6; |
| 1281 | |
| 1282 | if(u4_symbol && (u4_value < u1_max_bins)) |
| 1283 | { |
| 1284 | |
| 1285 | do |
| 1286 | { |
| 1287 | |
| 1288 | DECODE_ONE_BIN_MACRO(ps_bin_ctxt, u4_code_int_range, |
| 1289 | u4_code_int_val_ofst, pu4_table, |
| 1290 | ps_bitstrm, u4_symbol) |
| 1291 | |
| 1292 | INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(ps_cab_env); |
| 1293 | u4_value++; |
| 1294 | } |
| 1295 | while(u4_symbol && (u4_value < u1_max_bins)); |
| 1296 | |
| 1297 | } |
| 1298 | |
| 1299 | ps_cab_env->u4_code_int_range = u4_code_int_range; |
| 1300 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 1301 | u4_value = u4_value - 1 + u4_symbol; |
| 1302 | u4_prefix = (u4_value); |
| 1303 | } |
| 1304 | |
| 1305 | i2_mvd = u4_prefix; |
| 1306 | |
| 1307 | if(i2_mvd == 9) |
| 1308 | { |
| 1309 | /* Read Suffix */ |
| 1310 | k = ih264d_decode_bypass_bins_unary(ps_cab_env, ps_bitstrm); |
| 1311 | i2_suf = (1 << k) - 1; |
| 1312 | k = k + 3; |
| 1313 | i2_suf = (i2_suf << 3); |
| 1314 | i2_mvd += i2_suf; |
| 1315 | i2_suf = ih264d_decode_bypass_bins(ps_cab_env, k, ps_bitstrm); |
| 1316 | i2_mvd += i2_suf; |
| 1317 | } |
| 1318 | /* Read Sign bit */ |
| 1319 | if(!i2_mvd) |
| 1320 | return (i2_mvd); |
| 1321 | |
| 1322 | else |
| 1323 | { |
| 1324 | UWORD32 u4_code_int_val_ofst, u4_code_int_range; |
| 1325 | |
| 1326 | u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst; |
| 1327 | u4_code_int_range = ps_cab_env->u4_code_int_range; |
| 1328 | |
| 1329 | if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_9) |
| 1330 | { |
| 1331 | UWORD32 *pu4_buffer, u4_offset; |
| 1332 | |
| 1333 | pu4_buffer = ps_bitstrm->pu4_buffer; |
| 1334 | u4_offset = ps_bitstrm->u4_ofst; |
| 1335 | |
| 1336 | RENORM_RANGE_OFFSET(u4_code_int_range, u4_code_int_val_ofst, |
| 1337 | u4_offset, pu4_buffer) |
| 1338 | ps_bitstrm->u4_ofst = u4_offset; |
| 1339 | } |
| 1340 | |
| 1341 | u4_code_int_range = u4_code_int_range >> 1; |
| 1342 | |
| 1343 | if(u4_code_int_val_ofst >= u4_code_int_range) |
| 1344 | { |
| 1345 | /* S=1 */ |
| 1346 | u4_code_int_val_ofst -= u4_code_int_range; |
| 1347 | i2_mvd = (-i2_mvd); |
| 1348 | } |
| 1349 | |
| 1350 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 1351 | ps_cab_env->u4_code_int_range = u4_code_int_range; |
| 1352 | |
| 1353 | return (i2_mvd); |
| 1354 | |
| 1355 | } |
| 1356 | } |