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: ps_stereo_processing.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 Stereo Process or reconstruction 38 39 l_k(n) = H11(k,n)*s_k(n) + H21(k,n)*d_k(n) 40 41 r_k(n) = H12(k,n)*s_k(n) + H22(k,n)*d_k(n) 42 43 _______ ________ 44 | | _______ | | 45 ->|Hybrid | LF ---- | |->| Hybrid |--> 46 | Anal. | | | | | Synth | QMF -> L 47 ------- o----------------------->| | -------- Synth 48 QMF | s_k(n) |Stereo |--------------> 49 Anal. -------------------------->| | 50 _______ | | | | ________ 51 | | HF --o | ----------- |Process| | | 52 ->| Delay | | ->| |-------->| |->| Hybrid |--> 53 ------- | |decorrelate| d_k(n) | | | Synth | QMF -> R 54 ---->| |-------->| | -------- Synth 55 ----------- |_______|--------------> 56 57 58 ------------------------------------------------------------------------------ 59 REQUIREMENTS 60 61 62 ------------------------------------------------------------------------------ 63 REFERENCES 64 65 SC 29 Software Copyright Licencing Disclaimer: 66 67 This software module was originally developed by 68 Coding Technologies 69 70 and edited by 71 - 72 73 in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3 74 standards for reference purposes and its performance may not have been 75 optimized. This software module is an implementation of one or more tools as 76 specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards. 77 ISO/IEC gives users free license to this software module or modifications 78 thereof for use in products claiming conformance to audiovisual and 79 image-coding related ITU Recommendations and/or ISO/IEC International 80 Standards. ISO/IEC gives users the same free license to this software module or 81 modifications thereof for research purposes and further ISO/IEC standardisation. 82 Those intending to use this software module in products are advised that its 83 use may infringe existing patents. ISO/IEC have no liability for use of this 84 software module or modifications thereof. Copyright is not released for 85 products that do not conform to audiovisual and image-coding related ITU 86 Recommendations and/or ISO/IEC International Standards. 87 The original developer retains full right to modify and use the code for its 88 own purpose, assign or donate the code to a third party and to inhibit third 89 parties from using the code for products that do not conform to audiovisual and 90 image-coding related ITU Recommendations and/or ISO/IEC International Standards. 91 This copyright notice must be included in all copies or derivative works. 92 Copyright (c) ISO/IEC 2003. 93 94 ------------------------------------------------------------------------------ 95 PSEUDO-CODE 96 97 ------------------------------------------------------------------------------ 98 */ 99 100 101 /*---------------------------------------------------------------------------- 102 ; INCLUDES 103 ----------------------------------------------------------------------------*/ 104 105 #ifdef AAC_PLUS 106 107 #ifdef PARAMETRICSTEREO 108 #include "pv_audio_type_defs.h" 109 #include "ps_stereo_processing.h" 110 #include "fxp_mul32.h" 111 #include "ps_all_pass_filter_coeff.h" 112 113 /*---------------------------------------------------------------------------- 114 ; MACROS 115 ; Define module specific macros here 116 ----------------------------------------------------------------------------*/ 117 118 #ifndef min 119 #define min(a, b) ((a) < (b) ? (a) : (b)) 120 #endif 121 122 /*---------------------------------------------------------------------------- 123 ; DEFINES 124 ; Include all pre-processor statements here. Include conditional 125 ; compile variables also. 126 ----------------------------------------------------------------------------*/ 127 128 /*---------------------------------------------------------------------------- 129 ; LOCAL FUNCTION DEFINITIONS 130 ; Function Prototype declaration 131 ----------------------------------------------------------------------------*/ 132 133 /*---------------------------------------------------------------------------- 134 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 135 ; Variable declaration - defined here and used outside this module 136 ----------------------------------------------------------------------------*/ 137 138 139 /*---------------------------------------------------------------------------- 140 ; EXTERNAL FUNCTION REFERENCES 141 ; Declare functions defined elsewhere and referenced in this module 142 ----------------------------------------------------------------------------*/ 143 144 /*---------------------------------------------------------------------------- 145 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 146 ; Declare variables used in this module but defined elsewhere 147 ----------------------------------------------------------------------------*/ 148 149 150 /*---------------------------------------------------------------------------- 151 ; FUNCTION CODE 152 ----------------------------------------------------------------------------*/ 153 154 void ps_stereo_processing(STRUCT_PS_DEC *pms, 155 Int32 *qmfLeftReal, 156 Int32 *qmfLeftImag, 157 Int32 *qmfRightReal, 158 Int32 *qmfRightImag) 159 { 160 Int32 group; 161 Int32 subband; 162 Int32 maxSubband; 163 Int32 usb; 164 Char index; 165 166 167 Int32 *hybrLeftReal; 168 Int32 *hybrLeftImag; 169 Int32 *hybrRightReal; 170 Int32 *hybrRightImag; 171 Int32 *ptr_hybrLeftReal; 172 Int32 *ptr_hybrLeftImag; 173 Int32 *ptr_hybrRightReal; 174 Int32 *ptr_hybrRightImag; 175 176 177 Int16 h11; 178 Int16 h12; 179 Int16 h21; 180 Int16 h22; 181 182 Int32 temp1; 183 Int32 temp2; 184 Int32 temp3; 185 186 usb = pms->usb; 187 188 /* 189 * Complete Linear interpolation 190 */ 191 192 hybrLeftReal = pms->mHybridRealLeft; 193 hybrLeftImag = pms->mHybridImagLeft; 194 hybrRightReal = pms->mHybridRealRight; 195 hybrRightImag = pms->mHybridImagRight; 196 197 for (group = 0; group < SUBQMF_GROUPS; group++) /* SUBQMF_GROUPS == 10 */ 198 { 199 200 temp1 = pms->deltaH11[group]; 201 temp2 = pms->deltaH12[group]; 202 203 pms->H11[group] += temp1; 204 h11 = (Int16)(pms->H11[group] >> 16); 205 pms->H12[group] += temp2; 206 h12 = (Int16)(pms->H12[group] >> 16); 207 208 temp1 = pms->deltaH21[group]; 209 temp2 = pms->deltaH22[group]; 210 211 pms->H21[group] += temp1; 212 h21 = (Int16)(pms->H21[group] >> 16); 213 pms->H22[group] += temp2; 214 h22 = (Int16)(pms->H22[group] >> 16); 215 216 index = groupBorders[group]; 217 218 /* 219 * Reconstruction of Stereo sub-band signal 220 * 221 * l_k(n) = H11(k,n)*s_k(n) + H21(k,n)*d_k(n) 222 * 223 * r_k(n) = H12(k,n)*s_k(n) + H22(k,n)*d_k(n) 224 */ 225 ptr_hybrLeftReal = &hybrLeftReal[ index]; 226 ptr_hybrRightReal = &hybrRightReal[ index]; 227 228 temp1 = *(ptr_hybrLeftReal) << 1; 229 temp2 = *(ptr_hybrRightReal) << 1; 230 231 temp3 = fxp_mul32_by_16(temp1, h11); 232 *(ptr_hybrLeftReal) = fxp_mac32_by_16(temp2, h21, temp3) << 1; 233 234 temp3 = fxp_mul32_by_16(temp1, h12); 235 *(ptr_hybrRightReal) = fxp_mac32_by_16(temp2, h22, temp3) << 1; 236 237 238 ptr_hybrLeftImag = &hybrLeftImag[ index]; 239 ptr_hybrRightImag = &hybrRightImag[ index]; 240 241 temp1 = *(ptr_hybrLeftImag) << 1; 242 temp2 = *(ptr_hybrRightImag) << 1; 243 244 temp3 = fxp_mul32_by_16(temp1, h11); 245 *(ptr_hybrLeftImag) = fxp_mac32_by_16(temp2, h21, temp3) << 1; 246 247 temp3 = fxp_mul32_by_16(temp1, h12); 248 *(ptr_hybrRightImag) = fxp_mac32_by_16(temp2, h22, temp3) << 1; 249 250 251 } /* groups loop */ 252 253 temp1 = pms->deltaH11[SUBQMF_GROUPS]; 254 temp2 = pms->deltaH12[SUBQMF_GROUPS]; 255 256 pms->H11[SUBQMF_GROUPS] += temp1; 257 h11 = (Int16)(pms->H11[SUBQMF_GROUPS] >> 16); 258 pms->H12[SUBQMF_GROUPS] += temp2; 259 h12 = (Int16)(pms->H12[SUBQMF_GROUPS] >> 16); 260 261 temp1 = pms->deltaH21[SUBQMF_GROUPS]; 262 temp2 = pms->deltaH22[SUBQMF_GROUPS]; 263 264 pms->H21[SUBQMF_GROUPS] += temp1; 265 h21 = (Int16)(pms->H21[SUBQMF_GROUPS] >> 16); 266 pms->H22[SUBQMF_GROUPS] += temp2; 267 h22 = (Int16)(pms->H22[SUBQMF_GROUPS] >> 16); 268 269 270 ptr_hybrLeftReal = &qmfLeftReal[ 3]; 271 ptr_hybrRightReal = &qmfRightReal[ 3]; 272 273 /* 274 * Reconstruction of Stereo sub-band signal 275 * 276 * l_k(n) = H11(k,n)*s_k(n) + H21(k,n)*d_k(n) 277 * 278 * r_k(n) = H12(k,n)*s_k(n) + H22(k,n)*d_k(n) 279 */ 280 temp1 = *(ptr_hybrLeftReal) << 1; 281 temp2 = *(ptr_hybrRightReal) << 1; 282 283 284 temp3 = fxp_mul32_by_16(temp1, h11); 285 *(ptr_hybrLeftReal) = fxp_mac32_by_16(temp2, h21, temp3) << 1; 286 287 temp3 = fxp_mul32_by_16(temp1, h12); 288 *(ptr_hybrRightReal) = fxp_mac32_by_16(temp2, h22, temp3) << 1; 289 290 ptr_hybrLeftImag = &qmfLeftImag[ 3]; 291 ptr_hybrRightImag = &qmfRightImag[ 3]; 292 293 294 temp1 = *(ptr_hybrLeftImag) << 1; 295 temp2 = *(ptr_hybrRightImag) << 1; 296 297 temp3 = fxp_mul32_by_16(temp1, h11); 298 *(ptr_hybrLeftImag) = fxp_mac32_by_16(temp2, h21, temp3) << 1; 299 300 temp3 = fxp_mul32_by_16(temp1, h12); 301 *(ptr_hybrRightImag) = fxp_mac32_by_16(temp2, h22, temp3) << 1; 302 303 304 for (group = SUBQMF_GROUPS + 1; group < NO_IID_GROUPS; group++) /* 11 to NO_IID_GROUPS == 22 */ 305 { 306 temp1 = pms->deltaH11[group]; 307 temp2 = pms->deltaH12[group]; 308 309 pms->H11[group] += temp1; 310 h11 = (Int16)(pms->H11[group] >> 16); 311 pms->H12[group] += temp2; 312 h12 = (Int16)(pms->H12[group] >> 16); 313 314 temp1 = pms->deltaH21[group]; 315 temp2 = pms->deltaH22[group]; 316 317 pms->H21[group] += temp1; 318 h21 = (Int16)(pms->H21[group] >> 16); 319 pms->H22[group] += temp2; 320 h22 = (Int16)(pms->H22[group] >> 16); 321 322 index = groupBorders[group]; 323 maxSubband = groupBorders[group + 1]; 324 maxSubband = min(usb, maxSubband); 325 326 /* 327 * Reconstruction of Stereo sub-band signal 328 * 329 * l_k(n) = H11(k,n)*s_k(n) + H21(k,n)*d_k(n) 330 * 331 * r_k(n) = H12(k,n)*s_k(n) + H22(k,n)*d_k(n) 332 */ 333 334 ptr_hybrLeftReal = &qmfLeftReal[ index]; 335 ptr_hybrRightReal = &qmfRightReal[ index]; 336 337 for (subband = index; subband < maxSubband; subband++) 338 { 339 temp1 = *(ptr_hybrLeftReal) << 1; 340 temp2 = *(ptr_hybrRightReal) << 1; 341 temp3 = fxp_mul32_by_16(temp1, h11); 342 *(ptr_hybrLeftReal++) = fxp_mac32_by_16(temp2, h21, temp3) << 1; 343 344 temp3 = fxp_mul32_by_16(temp1, h12); 345 *(ptr_hybrRightReal++) = fxp_mac32_by_16(temp2, h22, temp3) << 1; 346 } 347 348 ptr_hybrLeftImag = &qmfLeftImag[ index]; 349 ptr_hybrRightImag = &qmfRightImag[ index]; 350 351 for (subband = index; subband < maxSubband; subband++) 352 { 353 temp1 = *(ptr_hybrLeftImag) << 1; 354 temp2 = *(ptr_hybrRightImag) << 1; 355 temp3 = fxp_mul32_by_16(temp1, h11); 356 *(ptr_hybrLeftImag++) = fxp_mac32_by_16(temp2, h21, temp3) << 1; 357 358 temp3 = fxp_mul32_by_16(temp1, h12); 359 *(ptr_hybrRightImag++) = fxp_mac32_by_16(temp2, h22, temp3) << 1; 360 361 } /* subband loop */ 362 363 } /* groups loop */ 364 365 } /* END ps_stereo_processing */ 366 367 368 #endif 369 370 371 #endif 372 373
