1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 /* 19 20 Filename: sbr_aliasing_reduction.c 21 22 ------------------------------------------------------------------------------ 23 REVISION HISTORY 24 25 26 Who: Date: MM/DD/YYYY 27 Description: 28 29 ------------------------------------------------------------------------------ 30 INPUT AND OUTPUT DEFINITIONS 31 32 33 34 ------------------------------------------------------------------------------ 35 FUNCTION DESCRIPTION 36 37 38 ------------------------------------------------------------------------------ 39 REQUIREMENTS 40 41 42 ------------------------------------------------------------------------------ 43 REFERENCES 44 45 SC 29 Software Copyright Licencing Disclaimer: 46 47 This software module was originally developed by 48 Coding Technologies 49 50 and edited by 51 - 52 53 in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3 54 standards for reference purposes and its performance may not have been 55 optimized. This software module is an implementation of one or more tools as 56 specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards. 57 ISO/IEC gives users free license to this software module or modifications 58 thereof for use in products claiming conformance to audiovisual and 59 image-coding related ITU Recommendations and/or ISO/IEC International 60 Standards. ISO/IEC gives users the same free license to this software module or 61 modifications thereof for research purposes and further ISO/IEC standardisation. 62 Those intending to use this software module in products are advised that its 63 use may infringe existing patents. ISO/IEC have no liability for use of this 64 software module or modifications thereof. Copyright is not released for 65 products that do not conform to audiovisual and image-coding related ITU 66 Recommendations and/or ISO/IEC International Standards. 67 The original developer retains full right to modify and use the code for its 68 own purpose, assign or donate the code to a third party and to inhibit third 69 parties from using the code for products that do not conform to audiovisual and 70 image-coding related ITU Recommendations and/or ISO/IEC International Standards. 71 This copyright notice must be included in all copies or derivative works. 72 Copyright (c) ISO/IEC 2002. 73 74 ------------------------------------------------------------------------------ 75 PSEUDO-CODE 76 77 ------------------------------------------------------------------------------ 78 */ 79 80 81 /*---------------------------------------------------------------------------- 82 ; INCLUDES 83 ----------------------------------------------------------------------------*/ 84 85 #ifdef AAC_PLUS 86 87 88 89 #include "sbr_aliasing_reduction.h" 90 #include "pv_sqrt.h" 91 92 #include "aac_mem_funcs.h" 93 94 #include "pv_div.h" 95 #include "fxp_mul32.h" 96 97 98 /*---------------------------------------------------------------------------- 99 ; MACROS 100 ; Define module specific macros here 101 ----------------------------------------------------------------------------*/ 102 103 104 /*---------------------------------------------------------------------------- 105 ; DEFINES 106 ; Include all pre-processor statements here. Include conditional 107 ; compile variables also. 108 ----------------------------------------------------------------------------*/ 109 110 #define Q30fmt(x) (Int32)(x*((Int32)1<<30) + (x>=0?0.5F:-0.5F)) 111 112 /*---------------------------------------------------------------------------- 113 ; LOCAL FUNCTION DEFINITIONS 114 ; Function Prototype declaration 115 ----------------------------------------------------------------------------*/ 116 117 /*---------------------------------------------------------------------------- 118 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 119 ; Variable declaration - defined here and used outside this module 120 ----------------------------------------------------------------------------*/ 121 122 /*---------------------------------------------------------------------------- 123 ; EXTERNAL FUNCTION REFERENCES 124 ; Declare functions defined elsewhere and referenced in this module 125 ----------------------------------------------------------------------------*/ 126 127 /*---------------------------------------------------------------------------- 128 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 129 ; Declare variables used in this module but defined elsewhere 130 ----------------------------------------------------------------------------*/ 131 132 /*---------------------------------------------------------------------------- 133 ; FUNCTION CODE 134 ----------------------------------------------------------------------------*/ 135 136 #include "pv_normalize.h" 137 #include "sbr_constants.h" 138 139 /******************************************************************************* 140 Functionname: sbr_aliasing_reduction 141 ******************************************************************************* 142 Description: 143 Arguments: 144 145 Return: none 146 *******************************************************************************/ 147 void sbr_aliasing_reduction(Int32 *degreeAlias, 148 Int32 * nrg_gain_man, 149 Int32 * nrg_gain_exp, 150 Int32 * nrg_est_man, 151 Int32 * nrg_est_exp, 152 Int32 * dontUseTheseGainValues, 153 Int32 noSubbands, 154 Int32 lowSubband, 155 Int32 sqrt_cache[][4], 156 Int32 * groupVector) 157 { 158 159 Int32 temp1; 160 Int32 est_total; 161 Int32 ref_total_man; 162 Int32 ref_total_exp; 163 Int32 tmp_q1; 164 Int32 tmp_q2; 165 Int32 tmp_q3; 166 Int32 tmp_q4; 167 Int32 bst_man; 168 Int32 bst_exp; 169 struct intg_div quotient; 170 struct intg_sqrt root_sq; 171 Int32 group; 172 Int32 grouping = 0; 173 Int32 index = 0; 174 Int32 noGroups; 175 Int32 k; 176 177 178 /* Calculate grouping*/ 179 for (k = 0; k < noSubbands - 1; k++) 180 { 181 if (degreeAlias[k + lowSubband + 1] && dontUseTheseGainValues[k] == 0) 182 { 183 if (grouping == 0) 184 { 185 groupVector[index] = k + lowSubband; 186 grouping = 1; 187 index++; 188 } 189 } 190 else 191 { 192 if (grouping) 193 { 194 groupVector[index] = k + lowSubband; 195 196 if (! dontUseTheseGainValues[k]) 197 { 198 (groupVector[index])++; 199 } 200 grouping = 0; 201 index++; 202 } 203 } 204 } 205 206 if (grouping) 207 { 208 groupVector[index] = noSubbands + lowSubband; 209 index++; 210 } 211 noGroups = (index >> 1); 212 213 214 215 /*Calculate new gain*/ 216 for (group = 0; group < noGroups; group ++) 217 { 218 219 int startGroup = groupVector[(group<<1)] - lowSubband; 220 int stopGroup = groupVector[(group<<1)+1] - lowSubband; 221 222 223 est_total = 0; 224 ref_total_man = 0; 225 226 tmp_q1 = -100; 227 tmp_q2 = -100; 228 229 for (k = startGroup; k < stopGroup; k++) 230 { 231 if (tmp_q1 < nrg_est_exp[k]) 232 { 233 tmp_q1 = nrg_est_exp[k]; /* max */ 234 } 235 if (tmp_q2 < (nrg_est_exp[k] + (nrg_gain_exp[k] << 1))) 236 { 237 tmp_q2 = (nrg_est_exp[k] + (nrg_gain_exp[k] << 1)); /* max */ 238 } 239 } 240 241 242 k -= startGroup; /* number of element used in the addition */ 243 /* adjust Q format */ 244 tmp_q2 += 59 - pv_normalize(k); 245 246 for (k = startGroup; k < stopGroup; k++) 247 { 248 /* 249 * est_total += nrg_est[k] 250 * ref_total += nrg_est[k]*nrg_gain[k]*nrg_gain[k 251 */ 252 est_total += nrg_est_man[k] >> (tmp_q1 - nrg_est_exp[k]); 253 254 if (tmp_q2 - (nrg_est_exp[k] + (nrg_gain_exp[k] << 1)) < 60) 255 { 256 nrg_gain_man[k] = fxp_mul32_Q28(nrg_gain_man[k], nrg_gain_man[k]); 257 nrg_gain_exp[k] = (nrg_gain_exp[k] << 1) + 28; 258 tmp_q3 = fxp_mul32_Q28(nrg_gain_man[k], nrg_est_man[k]); 259 ref_total_man += tmp_q3 >> (tmp_q2 - (nrg_est_exp[k] + nrg_gain_exp[k])); 260 } 261 } 262 263 ref_total_exp = tmp_q2 + 28; 264 265 pv_div(ref_total_man, est_total, "ient); 266 267 tmp_q2 += - tmp_q1 - quotient.shift_factor - 2; 268 269 270 271 for (k = startGroup; k < stopGroup; k++) 272 { 273 Int32 alpha; 274 temp1 = k + lowSubband; 275 if (k < noSubbands - 1) 276 { 277 alpha = degreeAlias[temp1 + 1] > degreeAlias[temp1 ] ? 278 degreeAlias[temp1 + 1] : degreeAlias[temp1 ]; 279 } 280 else 281 { 282 alpha = degreeAlias[temp1]; 283 } 284 285 /* 286 * nrg_gain[k] = alpha*newGain + (1.0f-alpha)*nrg_gain[k]*nrg_gain[k]; 287 */ 288 289 tmp_q1 = tmp_q2 > nrg_gain_exp[k] ? tmp_q2 : nrg_gain_exp[k]; 290 tmp_q1++; 291 292 tmp_q3 = fxp_mul32_Q30(alpha, quotient.quotient); 293 tmp_q4 = fxp_mul32_Q30(Q30fmt(1.0f) - alpha, nrg_gain_man[k]); 294 295 nrg_gain_man[k] = (tmp_q3 >> (tmp_q1 - tmp_q2)) + 296 (tmp_q4 >> (tmp_q1 - nrg_gain_exp[k])); 297 298 nrg_gain_exp[k] = tmp_q1; 299 } 300 301 302 bst_exp = -100; 303 304 for (k = startGroup; k < stopGroup; k++) 305 { 306 if (bst_exp < nrg_gain_exp[k] + nrg_est_exp[k]) 307 { 308 bst_exp = nrg_gain_exp[k] + nrg_est_exp[k]; /* max */ 309 } 310 } 311 312 k -= startGroup; /* number of element used in the addition */ 313 314 while (k != 0) /* bit guard protection depends on log2(k) */ 315 { 316 k >>= 1; 317 bst_exp++; /* add extra bit-overflow-guard */ 318 } 319 320 bst_man = 0; 321 322 for (k = startGroup; k < stopGroup; k++) 323 { 324 tmp_q2 = fxp_mul32_Q28(nrg_gain_man[k], nrg_est_man[k]); 325 bst_man += tmp_q2 >> (bst_exp - nrg_gain_exp[k] - nrg_est_exp[k]); 326 } 327 328 bst_exp += 28; /* compensate for shift down */ 329 330 if (bst_man) 331 { 332 /* 333 * bst = ref_total / bst 334 */ 335 336 pv_div(ref_total_man, bst_man, "ient); 337 bst_exp = ref_total_exp - bst_exp - quotient.shift_factor - 30; 338 bst_man = quotient.quotient; /* Q30 */ 339 340 for (k = startGroup; k < stopGroup; k++) 341 { 342 tmp_q1 = fxp_mul32_Q30(bst_man, nrg_gain_man[k]); 343 pv_sqrt(tmp_q1, (bst_exp + nrg_gain_exp[k] + 60), &root_sq, sqrt_cache[0]); 344 nrg_gain_man[k] = root_sq.root; 345 nrg_gain_exp[k] = root_sq.shift_factor; 346 } 347 } 348 else 349 { 350 pv_memset((void *)&nrg_gain_man[startGroup], 351 0, 352 (stopGroup - startGroup)*sizeof(nrg_gain_man[0])); 353 354 pv_memset((void *)&nrg_gain_exp[startGroup], 355 0, 356 (stopGroup - startGroup)*sizeof(nrg_gain_exp[0])); 357 358 } 359 360 } 361 } 362 363 #endif 364 365 366 367
