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_cabac.c |
| 23 | * |
| 24 | * \brief |
| 25 | * This file contains Binary decoding routines. |
| 26 | * |
| 27 | * \date |
| 28 | * 04/02/2003 |
| 29 | * |
| 30 | * \author NS |
| 31 | *************************************************************************** |
| 32 | */ |
| 33 | #include <string.h> |
| 34 | #include "ih264_typedefs.h" |
| 35 | #include "ih264_macros.h" |
| 36 | #include "ih264_platform_macros.h" |
| 37 | #include "ih264d_structs.h" |
| 38 | #include "ih264d_cabac.h" |
| 39 | #include "ih264d_bitstrm.h" |
| 40 | #include "ih264d_error_handler.h" |
| 41 | #include "ih264d_defs.h" |
| 42 | #include "ih264d_debug.h" |
| 43 | #include "ih264d_tables.h" |
| 44 | #include "ih264d_parse_cabac.h" |
| 45 | #include "ih264d_tables.h" |
| 46 | |
| 47 | |
| 48 | |
| 49 | /*! |
| 50 | ************************************************************************** |
| 51 | * \if Function name : ih264d_init_cabac_dec_envirnoment \endif |
| 52 | * |
| 53 | * \brief |
| 54 | * This function initializes CABAC decoding envirnoment. This function |
| 55 | * implements 9.3.3.2.3.1 of ISO/IEC14496-10. |
| 56 | * |
| 57 | * \return |
| 58 | * None |
| 59 | * |
| 60 | ************************************************************************** |
| 61 | */ |
| 62 | WORD32 ih264d_init_cabac_dec_envirnoment(decoding_envirnoment_t * ps_cab_env, |
| 63 | dec_bit_stream_t *ps_bitstrm) |
| 64 | { |
| 65 | UWORD32 u4_code_int_val_ofst; |
| 66 | |
| 67 | ps_cab_env->u4_code_int_range = (HALF - 2) << 23; |
| 68 | NEXTBITS(u4_code_int_val_ofst, ps_bitstrm->u4_ofst, ps_bitstrm->pu4_buffer, |
| 69 | 32); |
| 70 | FLUSHBITS(ps_bitstrm->u4_ofst, 9) |
| 71 | |
Hamsalekha S | 0b601e1 | 2020-06-10 12:16:40 +0530 | [diff] [blame] | 72 | if(EXCEED_OFFSET(ps_bitstrm)) |
Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame] | 73 | return ERROR_EOB_FLUSHBITS_T; |
| 74 | |
| 75 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 76 | |
| 77 | /*brief description of the design adopted for CABAC*/ |
| 78 | /*according to the standard the u4_code_int_range needs to be initialized 0x 1FE(10 bits) and |
| 79 | 9 bits from the bit stream need to be read and into the u4_code_int_val_ofst.As and when the |
| 80 | u4_code_int_range becomes less than 10 bits we need to renormalize and read from the bitstream* |
| 81 | |
| 82 | In the implemented design |
| 83 | initially |
| 84 | |
| 85 | range_new = range <<23 |
| 86 | valOffset_new = valOffset << 23 + 23 bits(read from the bit stream) |
| 87 | |
| 88 | Thus we have read 23 more bits ahead of time. |
| 89 | |
| 90 | It can be mathematical proved that even with the modified range and u4_ofst the operations |
| 91 | like comparison and subtraction needed for a bin decode are still valid(both in the regular case and the bypass case) |
| 92 | |
| 93 | As bins are decoded..we consume the bits that we have already read into the valOffset.The clz of Range |
| 94 | gives us the number of bits we consumed of the 23 bits that we have read ahead of time. |
| 95 | |
| 96 | when the number bits we have consumed exceeds 23 ,we renormalize..and we read from the bitstream again*/ |
| 97 | |
| 98 | RESET_BIN_COUNTS(ps_cab_env) |
| 99 | |
| 100 | return OK; |
| 101 | } |
| 102 | |
| 103 | /*****************************************************************************/ |
| 104 | /* */ |
| 105 | /* Function Name : ih264d_init_cabac_contexts */ |
| 106 | /* */ |
| 107 | /* Description : This function initializes the cabac contexts */ |
| 108 | /* depending upon slice type and Init_Idc value. */ |
| 109 | /* Inputs : ps_dec, slice type */ |
| 110 | /* Globals : <Does it use any global variables?> */ |
| 111 | /* Outputs : */ |
| 112 | /* Returns : void */ |
| 113 | /* */ |
| 114 | /* Issues : none */ |
| 115 | /* */ |
| 116 | /* Revision History: */ |
| 117 | /* */ |
| 118 | /* DD MM YYYY Author(s) Changes (Describe the changes made) */ |
| 119 | /* 03 05 2005 100153) Draft */ |
| 120 | /* */ |
| 121 | /*****************************************************************************/ |
| 122 | |
| 123 | void ih264d_init_cabac_contexts(UWORD8 u1_slice_type, dec_struct_t * ps_dec) |
| 124 | { |
| 125 | |
| 126 | bin_ctxt_model_t *p_cabac_ctxt_table_t = ps_dec->p_cabac_ctxt_table_t; |
| 127 | UWORD8 u1_qp_y = ps_dec->ps_cur_slice->u1_slice_qp; |
| 128 | UWORD8 u1_cabac_init_Idc = 0; |
| 129 | |
| 130 | if(I_SLICE != u1_slice_type) |
| 131 | { |
| 132 | u1_cabac_init_Idc = ps_dec->ps_cur_slice->u1_cabac_init_idc; |
| 133 | } |
| 134 | |
| 135 | { |
| 136 | /* MAKING ps_dec->p_ctxt_inc_mb_map a scratch buffer */ |
| 137 | /* 0th entry of CtxtIncMbMap will be always be containing default values |
| 138 | for CABAC context representing MB not available */ |
| 139 | ctxt_inc_mb_info_t *p_DefCtxt = ps_dec->p_ctxt_inc_mb_map - 1; |
| 140 | UWORD8 *pu1_temp; |
| 141 | WORD8 i; |
| 142 | p_DefCtxt->u1_mb_type = CAB_SKIP; |
| 143 | |
| 144 | p_DefCtxt->u1_cbp = 0x0f; |
| 145 | p_DefCtxt->u1_intra_chroma_pred_mode = 0; |
| 146 | |
| 147 | p_DefCtxt->u1_yuv_dc_csbp = 0x7; |
| 148 | |
| 149 | p_DefCtxt->u1_transform8x8_ctxt = 0; |
| 150 | |
| 151 | pu1_temp = (UWORD8*)p_DefCtxt->i1_ref_idx; |
| 152 | for(i = 0; i < 4; i++, pu1_temp++) |
| 153 | (*pu1_temp) = 0; |
| 154 | pu1_temp = (UWORD8*)p_DefCtxt->u1_mv; |
| 155 | for(i = 0; i < 16; i++, pu1_temp++) |
| 156 | (*pu1_temp) = 0; |
| 157 | ps_dec->ps_def_ctxt_mb_info = p_DefCtxt; |
| 158 | } |
| 159 | |
| 160 | if(u1_slice_type == I_SLICE) |
| 161 | { |
| 162 | u1_cabac_init_Idc = 3; |
| 163 | ps_dec->p_mb_type_t = p_cabac_ctxt_table_t + MB_TYPE_I_SLICE; |
| 164 | } |
| 165 | else if(u1_slice_type == P_SLICE) |
| 166 | { |
| 167 | ps_dec->p_mb_type_t = p_cabac_ctxt_table_t + MB_TYPE_P_SLICE; |
| 168 | ps_dec->p_mb_skip_flag_t = p_cabac_ctxt_table_t + MB_SKIP_FLAG_P_SLICE; |
| 169 | ps_dec->p_sub_mb_type_t = p_cabac_ctxt_table_t + SUB_MB_TYPE_P_SLICE; |
| 170 | } |
| 171 | else if(u1_slice_type == B_SLICE) |
| 172 | { |
| 173 | ps_dec->p_mb_type_t = p_cabac_ctxt_table_t + MB_TYPE_B_SLICE; |
| 174 | ps_dec->p_mb_skip_flag_t = p_cabac_ctxt_table_t + MB_SKIP_FLAG_B_SLICE; |
| 175 | ps_dec->p_sub_mb_type_t = p_cabac_ctxt_table_t + SUB_MB_TYPE_B_SLICE; |
| 176 | } |
| 177 | { |
| 178 | bin_ctxt_model_t *p_cabac_ctxt_table_t_tmp = p_cabac_ctxt_table_t; |
| 179 | if(ps_dec->ps_cur_slice->u1_field_pic_flag) |
| 180 | { |
| 181 | p_cabac_ctxt_table_t_tmp += SIGNIFICANT_COEFF_FLAG_FLD; |
| 182 | |
| 183 | } |
| 184 | else |
| 185 | { |
| 186 | p_cabac_ctxt_table_t_tmp += SIGNIFICANT_COEFF_FLAG_FRAME; |
| 187 | } |
| 188 | { |
| 189 | bin_ctxt_model_t * * p_significant_coeff_flag_t = |
| 190 | ps_dec->p_significant_coeff_flag_t; |
| 191 | p_significant_coeff_flag_t[0] = p_cabac_ctxt_table_t_tmp |
| 192 | + SIG_COEFF_CTXT_CAT_0_OFFSET; |
| 193 | p_significant_coeff_flag_t[1] = p_cabac_ctxt_table_t_tmp |
| 194 | + SIG_COEFF_CTXT_CAT_1_OFFSET; |
| 195 | p_significant_coeff_flag_t[2] = p_cabac_ctxt_table_t_tmp |
| 196 | + SIG_COEFF_CTXT_CAT_2_OFFSET; |
| 197 | p_significant_coeff_flag_t[3] = p_cabac_ctxt_table_t_tmp |
| 198 | + SIG_COEFF_CTXT_CAT_3_OFFSET; |
| 199 | p_significant_coeff_flag_t[4] = p_cabac_ctxt_table_t_tmp |
| 200 | + SIG_COEFF_CTXT_CAT_4_OFFSET; |
| 201 | |
| 202 | p_significant_coeff_flag_t[5] = p_cabac_ctxt_table_t_tmp |
| 203 | + SIG_COEFF_CTXT_CAT_5_OFFSET; |
| 204 | |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | memcpy(p_cabac_ctxt_table_t, |
| 209 | gau1_ih264d_cabac_ctxt_init_table[u1_cabac_init_Idc][u1_qp_y], |
| 210 | NUM_CABAC_CTXTS * sizeof(bin_ctxt_model_t)); |
| 211 | } |
| 212 | /*! |
| 213 | ************************************************************************** |
| 214 | * \if Function name : ih264d_decode_bin \endif |
| 215 | * |
| 216 | * \brief |
| 217 | * This function implements decoding process of a decision as defined |
| 218 | * in 9.3.3.2.2. |
| 219 | * |
| 220 | * \return |
| 221 | * Returns symbol decoded. |
| 222 | * |
| 223 | * \note |
| 224 | * It is specified in 9.3.3.2.3.2 that, one of the input to this function |
| 225 | * is CtxIdx. CtxIdx is used to identify state and MPS of that context |
| 226 | * (Refer Fig 9.11 - Flowchart for encoding a decision). To suffice that |
| 227 | * here we pass a pointer bin_ctxt_model_t which contains these values. |
| 228 | * |
| 229 | ************************************************************************** |
| 230 | */ |
| 231 | |
| 232 | UWORD32 ih264d_decode_bin(UWORD32 u4_ctx_inc, |
| 233 | bin_ctxt_model_t *ps_src_bin_ctxt, |
| 234 | dec_bit_stream_t *ps_bitstrm, |
| 235 | decoding_envirnoment_t *ps_cab_env) |
| 236 | |
| 237 | { |
| 238 | |
| 239 | UWORD32 u4_qnt_int_range, u4_code_int_range, u4_code_int_val_ofst, |
| 240 | u4_int_range_lps; |
| 241 | |
| 242 | UWORD32 u4_symbol, u4_mps_state; |
| 243 | |
| 244 | bin_ctxt_model_t *ps_bin_ctxt; |
| 245 | |
| 246 | UWORD32 table_lookup; |
| 247 | const UWORD32 *pu4_table = (const UWORD32 *)ps_cab_env->cabac_table; |
| 248 | UWORD32 u4_clz; |
| 249 | |
| 250 | ps_bin_ctxt = ps_src_bin_ctxt + u4_ctx_inc; |
| 251 | |
| 252 | u4_code_int_range = ps_cab_env->u4_code_int_range; |
| 253 | u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst; |
| 254 | |
| 255 | u4_mps_state = (ps_bin_ctxt->u1_mps_state); |
| 256 | u4_clz = CLZ(u4_code_int_range); |
| 257 | |
| 258 | u4_qnt_int_range = u4_code_int_range << u4_clz; |
| 259 | u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3; |
| 260 | |
| 261 | table_lookup = pu4_table[(u4_mps_state << 2) + u4_qnt_int_range]; |
| 262 | u4_int_range_lps = table_lookup & 0xff; |
| 263 | |
| 264 | u4_int_range_lps = u4_int_range_lps << (23 - u4_clz); |
| 265 | u4_code_int_range = u4_code_int_range - u4_int_range_lps; |
| 266 | |
| 267 | u4_symbol = ((u4_mps_state >> 6) & 0x1); |
| 268 | |
| 269 | u4_mps_state = (table_lookup >> 8) & 0x7F; |
| 270 | |
| 271 | CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst, u4_symbol, |
| 272 | u4_int_range_lps, u4_mps_state, table_lookup) |
| 273 | |
| 274 | if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_8) |
| 275 | { |
| 276 | UWORD32 *pu4_buffer, u4_offset; |
| 277 | |
| 278 | pu4_buffer = ps_bitstrm->pu4_buffer; |
| 279 | u4_offset = ps_bitstrm->u4_ofst; |
| 280 | |
| 281 | RENORM_RANGE_OFFSET(u4_code_int_range, u4_code_int_val_ofst, u4_offset, |
| 282 | pu4_buffer) |
| 283 | |
| 284 | ps_bitstrm->u4_ofst = u4_offset; |
| 285 | } |
| 286 | |
| 287 | INC_BIN_COUNT(ps_cab_env) |
| 288 | |
| 289 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 290 | ps_cab_env->u4_code_int_range = u4_code_int_range; |
| 291 | ps_bin_ctxt->u1_mps_state = u4_mps_state; |
| 292 | |
| 293 | return (u4_symbol); |
| 294 | } |
| 295 | |
| 296 | /*! |
| 297 | ************************************************************************** |
| 298 | * \if Function name : ih264d_decode_terminate \endif |
| 299 | * |
| 300 | * \brief |
| 301 | * This function implements decoding process of a termination as defined |
| 302 | * 9.3.3.2.2.3 of ISO/IEC14496-10. |
| 303 | * |
| 304 | * \return |
| 305 | * Returns symbol decoded. |
| 306 | * |
| 307 | * \note |
| 308 | * This routine is called while decoding "end_of_skice_flag" and of the |
| 309 | * bin indicating PCM mode in MBType. |
| 310 | * |
| 311 | ************************************************************************** |
| 312 | */ |
| 313 | UWORD8 ih264d_decode_terminate(decoding_envirnoment_t * ps_cab_env, |
| 314 | dec_bit_stream_t * ps_stream) |
| 315 | { |
| 316 | UWORD32 u4_symbol; |
| 317 | UWORD32 u4_code_int_val_ofst, u4_code_int_range; |
| 318 | UWORD32 u4_clz; |
| 319 | |
| 320 | u4_code_int_range = ps_cab_env->u4_code_int_range; |
| 321 | u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst; |
| 322 | |
| 323 | u4_clz = CLZ(u4_code_int_range); |
| 324 | u4_code_int_range -= (2 << (23 - u4_clz)); |
| 325 | |
| 326 | if(u4_code_int_val_ofst >= u4_code_int_range) |
| 327 | { |
| 328 | /* S=1 */ |
| 329 | u4_symbol = 1; |
| 330 | |
| 331 | { |
| 332 | |
| 333 | /*the u4_ofst needs to be updated before termination*/ |
| 334 | ps_stream->u4_ofst += u4_clz; |
| 335 | |
| 336 | } |
| 337 | |
| 338 | } |
| 339 | else |
| 340 | { |
| 341 | /* S=0 */ |
| 342 | u4_symbol = 0; |
| 343 | |
| 344 | if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_8) |
| 345 | { |
| 346 | UWORD32 *pu4_buffer, u4_offset; |
| 347 | |
| 348 | pu4_buffer = ps_stream->pu4_buffer; |
| 349 | u4_offset = ps_stream->u4_ofst; |
| 350 | |
| 351 | RENORM_RANGE_OFFSET(u4_code_int_range, u4_code_int_val_ofst, u4_offset, |
| 352 | pu4_buffer) |
| 353 | ps_stream->u4_ofst = u4_offset; |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | ps_cab_env->u4_code_int_range = u4_code_int_range; |
| 358 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 359 | |
| 360 | INC_BIN_COUNT(ps_cab_env) |
| 361 | |
| 362 | return (u4_symbol); |
| 363 | } |
| 364 | |
| 365 | /*****************************************************************************/ |
| 366 | /* */ |
| 367 | /* Function Name : ih264d_decode_bins_tunary */ |
| 368 | /* */ |
| 369 | /* Description : This function decodes bins in the case of TUNARY */ |
| 370 | /* binarization technique.valid_length is assumed equal to 3 */ |
| 371 | /* and u1_max_bins <= 4 in this functon. */ |
| 372 | /* Inputs : <What inputs does the function take?> */ |
| 373 | /* Globals : <Does it use any global variables?> */ |
| 374 | /* Processing : <Describe how the function operates - include algorithm */ |
| 375 | /* description> */ |
| 376 | /* Outputs : <What does the function produce?> */ |
| 377 | /* Returns : <What does the function return?> */ |
| 378 | /* */ |
| 379 | /* Issues : */ |
| 380 | /* */ |
| 381 | /* Revision History: */ |
| 382 | /* */ |
| 383 | /* DD MM YYYY Author(s) Changes (Describe the changes made) */ |
| 384 | /* 20 11 2008 SH Draft */ |
| 385 | /* */ |
| 386 | /*****************************************************************************/ |
| 387 | |
| 388 | UWORD32 ih264d_decode_bins_tunary(UWORD8 u1_max_bins, |
| 389 | UWORD32 u4_ctx_inc, |
| 390 | bin_ctxt_model_t *ps_src_bin_ctxt, |
| 391 | dec_bit_stream_t *ps_bitstrm, |
| 392 | decoding_envirnoment_t *ps_cab_env) |
| 393 | |
| 394 | { |
| 395 | UWORD32 u4_value; |
| 396 | UWORD32 u4_symbol; |
| 397 | UWORD8 u4_ctx_Inc; |
| 398 | bin_ctxt_model_t *ps_bin_ctxt; |
| 399 | UWORD32 u4_code_int_range, u4_code_int_val_ofst; |
| 400 | const UWORD32 *pu4_table = (const UWORD32 *)ps_cab_env->cabac_table; |
| 401 | |
| 402 | u4_value = 0; |
| 403 | |
| 404 | /*u1_max_bins has to be less than or equal to 4, u1_max_bins <= 4 for this function*/ |
| 405 | |
| 406 | /*here the valid length is assumed to be equal to 3 ,so the calling function is expected |
| 407 | to duplicate CtxInc if valid lenth is 2 and cmaxbin is greater than2*/ |
| 408 | u4_code_int_range = ps_cab_env->u4_code_int_range; |
| 409 | u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst; |
| 410 | |
| 411 | do |
| 412 | { |
| 413 | u4_ctx_Inc = u4_ctx_inc & 0xF; |
| 414 | u4_ctx_inc = u4_ctx_inc >> 4; |
| 415 | |
| 416 | ps_bin_ctxt = ps_src_bin_ctxt + u4_ctx_Inc; |
| 417 | |
| 418 | DECODE_ONE_BIN_MACRO(ps_bin_ctxt, u4_code_int_range, u4_code_int_val_ofst, |
| 419 | pu4_table, ps_bitstrm, u4_symbol) |
| 420 | |
| 421 | INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(ps_cab_env); |
| 422 | |
| 423 | u4_value++; |
| 424 | } |
| 425 | while((u4_value < u1_max_bins) & (u4_symbol)); |
| 426 | |
| 427 | u4_value = u4_value - 1 + u4_symbol; |
| 428 | |
| 429 | ps_cab_env->u4_code_int_range = u4_code_int_range; |
| 430 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 431 | |
| 432 | return (u4_value); |
| 433 | |
| 434 | } |
| 435 | |
| 436 | /*****************************************************************************/ |
| 437 | /* */ |
| 438 | /* Function Name : ih264d_decode_bins */ |
| 439 | /* */ |
| 440 | /* Description : This function decodes bins in the case of MSB_FIRST_FLC */ |
| 441 | /* binarization technique.valid_length is always equal max_bins */ |
| 442 | /* for MSB_FIRST_FLC. assumes u1_max_bins <= 4 */ |
| 443 | /* Inputs : <What inputs does the function take?> */ |
| 444 | /* Globals : <Does it use any global variables?> */ |
| 445 | /* Processing : <Describe how the function operates - include algorithm */ |
| 446 | /* description> */ |
| 447 | /* Outputs : <What does the function produce?> */ |
| 448 | /* Returns : <What does the function return?> */ |
| 449 | /* */ |
| 450 | /* Issues : <List any issues or problems with this function> */ |
| 451 | /* */ |
| 452 | /* Revision History: */ |
| 453 | /* */ |
| 454 | /* DD MM YYYY Author(s) Changes (Describe the changes made) */ |
| 455 | /* 20 11 2008 SH Draft */ |
| 456 | /* */ |
| 457 | /*****************************************************************************/ |
| 458 | |
| 459 | UWORD32 ih264d_decode_bins(UWORD8 u1_max_bins, |
| 460 | UWORD32 u4_ctx_inc, |
| 461 | bin_ctxt_model_t *ps_src_bin_ctxt, |
| 462 | dec_bit_stream_t *ps_bitstrm, |
| 463 | decoding_envirnoment_t *ps_cab_env) |
| 464 | |
| 465 | { |
| 466 | UWORD32 u4_value; |
| 467 | UWORD32 u4_symbol, i; |
| 468 | UWORD32 u4_ctxt_inc; |
| 469 | bin_ctxt_model_t *ps_bin_ctxt; |
| 470 | UWORD32 u4_code_int_range, u4_code_int_val_ofst; |
| 471 | const UWORD32 *pu4_table = (const UWORD32 *)ps_cab_env->cabac_table; |
| 472 | |
| 473 | i = 0; |
| 474 | |
| 475 | u4_value = 0; |
| 476 | |
| 477 | /*u1_max_bins has to be less than or equal to 4, u1_max_bins <= 4 for this fucntion*/ |
| 478 | u4_code_int_range = ps_cab_env->u4_code_int_range; |
| 479 | u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst; |
| 480 | |
| 481 | do |
| 482 | { |
| 483 | u4_ctxt_inc = u4_ctx_inc & 0xf; |
| 484 | u4_ctx_inc = u4_ctx_inc >> 4; |
| 485 | |
| 486 | ps_bin_ctxt = ps_src_bin_ctxt + u4_ctxt_inc; |
| 487 | |
| 488 | DECODE_ONE_BIN_MACRO(ps_bin_ctxt, u4_code_int_range, u4_code_int_val_ofst, |
| 489 | pu4_table, ps_bitstrm, u4_symbol) |
| 490 | |
| 491 | INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(ps_cab_env); |
| 492 | |
| 493 | u4_value = (u4_value << 1) | (u4_symbol); |
| 494 | |
| 495 | i++; |
| 496 | } |
| 497 | while(i < u1_max_bins); |
| 498 | |
| 499 | ps_cab_env->u4_code_int_range = u4_code_int_range; |
| 500 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 501 | |
| 502 | return (u4_value); |
| 503 | |
| 504 | } |
| 505 | |
| 506 | /*****************************************************************************/ |
| 507 | /* */ |
| 508 | /* Function Name : ih264d_decode_bins_unary */ |
| 509 | /* */ |
| 510 | /* Description : This function decodes bins in the case of UNARY */ |
| 511 | /* binarization technique.here the valid length is taken to 5*/ |
| 512 | /* and cmax is always greater than 9 */ |
| 513 | /* Inputs : <What inputs does the function take?> */ |
| 514 | /* Globals : <Does it use any global variables?> */ |
| 515 | /* Processing : <Describe how the function operates - include algorithm */ |
| 516 | /* description> */ |
| 517 | /* Outputs : <What does the function produce?> */ |
| 518 | /* Returns : <What does the function return?> */ |
| 519 | /* */ |
| 520 | /* Issues : <List any issues or problems with this function> */ |
| 521 | /* */ |
| 522 | /* Revision History: */ |
| 523 | /* */ |
| 524 | /* DD MM YYYY Author(s) Changes (Describe the changes made) */ |
| 525 | /* 20 11 2008 SH Draft */ |
| 526 | /* */ |
| 527 | /*****************************************************************************/ |
| 528 | UWORD32 ih264d_decode_bins_unary(UWORD8 u1_max_bins, |
| 529 | UWORD32 u4_ctx_inc, |
| 530 | bin_ctxt_model_t *ps_src_bin_ctxt, |
| 531 | dec_bit_stream_t *ps_bitstrm, |
| 532 | decoding_envirnoment_t *ps_cab_env) |
| 533 | { |
| 534 | UWORD32 u4_value; |
| 535 | UWORD32 u4_symbol; |
| 536 | bin_ctxt_model_t *ps_bin_ctxt; |
| 537 | UWORD32 u4_ctx_Inc; |
| 538 | UWORD32 u4_code_int_range, u4_code_int_val_ofst; |
| 539 | const UWORD32 *pu4_table = (const UWORD32 *)ps_cab_env->cabac_table; |
| 540 | |
| 541 | /* in this function the valid length for u4_ctx_inc is always taken to be,so if the |
| 542 | the valid length is lessthan 5 the caller need to duplicate accordingly*/ |
| 543 | |
| 544 | /*u1_max_bins is always greater or equal to 9 we have the check for u1_max_bins only after the 2 loop*/ |
| 545 | u4_value = 0; |
| 546 | u4_code_int_range = ps_cab_env->u4_code_int_range; |
| 547 | u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst; |
| 548 | |
| 549 | do |
| 550 | { |
| 551 | u4_ctx_Inc = u4_ctx_inc & 0xf; |
| 552 | u4_ctx_inc = u4_ctx_inc >> 4; |
| 553 | |
| 554 | ps_bin_ctxt = ps_src_bin_ctxt + u4_ctx_Inc; |
| 555 | |
| 556 | DECODE_ONE_BIN_MACRO(ps_bin_ctxt, u4_code_int_range, u4_code_int_val_ofst, |
| 557 | pu4_table, ps_bitstrm, u4_symbol) |
| 558 | |
| 559 | INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(ps_cab_env); |
| 560 | |
| 561 | u4_value++; |
| 562 | |
| 563 | } |
| 564 | while(u4_symbol && u4_value < 4); |
| 565 | |
| 566 | if(u4_symbol && (u4_value < u1_max_bins)) |
| 567 | { |
| 568 | |
| 569 | u4_ctx_Inc = u4_ctx_inc & 0xf; |
| 570 | |
| 571 | ps_bin_ctxt = ps_src_bin_ctxt + u4_ctx_Inc; |
| 572 | |
| 573 | do |
| 574 | { |
| 575 | |
| 576 | DECODE_ONE_BIN_MACRO(ps_bin_ctxt, u4_code_int_range, u4_code_int_val_ofst, |
| 577 | pu4_table, ps_bitstrm, u4_symbol) |
| 578 | |
| 579 | INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(ps_cab_env); |
| 580 | |
| 581 | u4_value++; |
| 582 | |
| 583 | } |
| 584 | while(u4_symbol && (u4_value < u1_max_bins)); |
| 585 | |
| 586 | } |
| 587 | |
| 588 | ps_cab_env->u4_code_int_range = u4_code_int_range; |
| 589 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 590 | |
| 591 | u4_value = u4_value - 1 + u4_symbol; |
| 592 | |
| 593 | return (u4_value); |
| 594 | |
| 595 | } |
| 596 | |
| 597 | /*****************************************************************************/ |
| 598 | /* */ |
| 599 | /* Function Name : ih264d_decode_bypass_bins_unary */ |
| 600 | /* */ |
| 601 | /* Description : This function is used in the case of UNARY coding */ |
| 602 | /* */ |
| 603 | /* */ |
| 604 | /* Inputs : <What inputs does the function take?> */ |
| 605 | /* Globals : <Does it use any global variables?> */ |
| 606 | /* Processing : <Describe how the function operates - include algorithm */ |
| 607 | /* description> */ |
| 608 | /* Outputs : <What does the function produce?> */ |
| 609 | /* Returns : <What does the function return?> */ |
| 610 | /* */ |
| 611 | /* Issues : <List any issues or problems with this function> */ |
| 612 | /* */ |
| 613 | /* Revision History: */ |
| 614 | /* */ |
| 615 | /* DD MM YYYY Author(s) Changes (Describe the changes made) */ |
| 616 | /* 13 10 2005 Ittiam Draft */ |
| 617 | /* */ |
| 618 | /*****************************************************************************/ |
| 619 | |
| 620 | UWORD32 ih264d_decode_bypass_bins_unary(decoding_envirnoment_t *ps_cab_env, |
| 621 | dec_bit_stream_t *ps_bitstrm) |
| 622 | { |
| 623 | UWORD32 u4_value; |
| 624 | UWORD32 u4_bin; |
| 625 | UWORD32 u4_code_int_val_ofst, u4_code_int_range; |
| 626 | |
| 627 | UWORD32 u1_max_bins; |
| 628 | |
| 629 | u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst; |
| 630 | u4_code_int_range = ps_cab_env->u4_code_int_range; |
| 631 | |
| 632 | if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_9) |
| 633 | { |
| 634 | UWORD32 *pu4_buffer, u4_offset; |
| 635 | |
| 636 | pu4_buffer = ps_bitstrm->pu4_buffer; |
| 637 | u4_offset = ps_bitstrm->u4_ofst; |
| 638 | |
| 639 | RENORM_RANGE_OFFSET(u4_code_int_range, u4_code_int_val_ofst, u4_offset, |
| 640 | pu4_buffer) |
| 641 | ps_bitstrm->u4_ofst = u4_offset; |
| 642 | } |
| 643 | |
| 644 | /*as it is called only form mvd*/ |
| 645 | u1_max_bins = 32; |
| 646 | u4_value = 0; |
| 647 | |
| 648 | do |
| 649 | { |
| 650 | u4_value++; |
| 651 | |
| 652 | u4_code_int_range = u4_code_int_range >> 1; |
| 653 | if(u4_code_int_val_ofst >= u4_code_int_range) |
| 654 | { |
| 655 | /* S=1 */ |
| 656 | u4_bin = 1; |
| 657 | u4_code_int_val_ofst -= u4_code_int_range; |
| 658 | } |
| 659 | else |
| 660 | { |
| 661 | /* S=0 */ |
| 662 | u4_bin = 0; |
| 663 | } |
| 664 | |
| 665 | INC_BIN_COUNT(ps_cab_env);INC_BYPASS_BINS(ps_cab_env); |
| 666 | |
| 667 | if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_9) |
| 668 | { |
| 669 | UWORD32 *pu4_buffer, u4_offset; |
| 670 | |
| 671 | pu4_buffer = ps_bitstrm->pu4_buffer; |
| 672 | u4_offset = ps_bitstrm->u4_ofst; |
| 673 | |
| 674 | RENORM_RANGE_OFFSET(u4_code_int_range, u4_code_int_val_ofst, u4_offset, |
| 675 | pu4_buffer) |
| 676 | |
| 677 | ps_bitstrm->u4_ofst = u4_offset; |
| 678 | } |
| 679 | |
| 680 | } |
| 681 | while(u4_bin && (u4_value < u1_max_bins)); |
| 682 | |
| 683 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 684 | ps_cab_env->u4_code_int_range = u4_code_int_range; |
| 685 | u4_value = (u4_value - 1 + u4_bin); |
| 686 | |
| 687 | return (u4_value); |
| 688 | } |
| 689 | |
| 690 | /*****************************************************************************/ |
| 691 | /* */ |
| 692 | /* Function Name : ih264d_decode_bypass_bins */ |
| 693 | /* */ |
| 694 | /* Description : This function is used in the case of FLC coding */ |
| 695 | /* */ |
| 696 | /* */ |
| 697 | /* Inputs : <What inputs does the function take?> */ |
| 698 | /* Globals : <Does it use any global variables?> */ |
| 699 | /* Processing : <Describe how the function operates - include algorithm */ |
| 700 | /* description> */ |
| 701 | /* Outputs : <What does the function produce?> */ |
| 702 | /* Returns : <What does the function return?> */ |
| 703 | /* */ |
| 704 | /* Issues : <List any issues or problems with this function> */ |
| 705 | /* */ |
| 706 | /* Revision History: */ |
| 707 | /* */ |
| 708 | /* DD MM YYYY Author(s) Changes (Describe the changes made) */ |
| 709 | /* 13 10 2005 Ittiam Draft */ |
| 710 | /* */ |
| 711 | /*****************************************************************************/ |
| 712 | |
| 713 | UWORD32 ih264d_decode_bypass_bins(decoding_envirnoment_t *ps_cab_env, |
| 714 | UWORD8 u1_max_bins, |
| 715 | dec_bit_stream_t *ps_bitstrm) |
| 716 | { |
| 717 | UWORD32 u4_bins; |
| 718 | UWORD32 u4_bin; |
| 719 | UWORD32 u4_code_int_val_ofst, u4_code_int_range; |
| 720 | |
| 721 | u4_bins = 0; |
| 722 | u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst; |
| 723 | u4_code_int_range = ps_cab_env->u4_code_int_range; |
| 724 | |
| 725 | if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_9) |
| 726 | { |
| 727 | UWORD32 *pu4_buffer, u4_offset; |
| 728 | |
| 729 | pu4_buffer = ps_bitstrm->pu4_buffer; |
| 730 | u4_offset = ps_bitstrm->u4_ofst; |
| 731 | |
| 732 | RENORM_RANGE_OFFSET(u4_code_int_range, u4_code_int_val_ofst, u4_offset, |
| 733 | pu4_buffer) |
| 734 | ps_bitstrm->u4_ofst = u4_offset; |
| 735 | } |
| 736 | |
| 737 | do |
| 738 | { |
| 739 | |
| 740 | u4_code_int_range = u4_code_int_range >> 1; |
| 741 | |
| 742 | if(u4_code_int_val_ofst >= u4_code_int_range) |
| 743 | { |
| 744 | /* S=1 */ |
| 745 | u4_bin = 1; |
| 746 | u4_code_int_val_ofst -= u4_code_int_range; |
| 747 | } |
| 748 | else |
| 749 | { |
| 750 | /* S=0 */ |
| 751 | u4_bin = 0; |
| 752 | } |
| 753 | |
| 754 | INC_BIN_COUNT(ps_cab_env);INC_BYPASS_BINS(ps_cab_env); |
| 755 | |
| 756 | u4_bins = ((u4_bins << 1) | u4_bin); |
| 757 | u1_max_bins--; |
| 758 | |
| 759 | if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_9) |
| 760 | { |
| 761 | UWORD32 *pu4_buffer, u4_offset; |
| 762 | |
| 763 | pu4_buffer = ps_bitstrm->pu4_buffer; |
| 764 | u4_offset = ps_bitstrm->u4_ofst; |
| 765 | |
| 766 | RENORM_RANGE_OFFSET(u4_code_int_range, u4_code_int_val_ofst, u4_offset, |
| 767 | pu4_buffer) |
| 768 | ps_bitstrm->u4_ofst = u4_offset; |
| 769 | } |
| 770 | |
| 771 | } |
| 772 | while(u1_max_bins); |
| 773 | |
| 774 | ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst; |
| 775 | ps_cab_env->u4_code_int_range = u4_code_int_range; |
| 776 | |
| 777 | return (u4_bins); |
| 778 | } |
| 779 | |