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_hybrid_synthesis.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 Hybrid synthesis 38 39 _______ ________ 40 | | _______ | | 41 ->|Hybrid | LF ---- | |->| Hybrid |--> 42 | Anal. | | | | | Synth | QMF -> L 43 ------- o----------------------->| | -------- Synth 44 QMF | s_k(n) |Stereo |--------------> 45 Anal. -------------------------->| | 46 _______ | | | | ________ 47 | | HF --o | ----------- |Process| | | 48 ->| Delay | | ->| |-------->| |->| Hybrid |--> 49 ------- | |decorrelate| d_k(n) | | | Synth | QMF -> R 50 ---->| |-------->| | -------- Synth 51 ----------- |_______|--------------> 52 53 54 ------------------------------------------------------------------------------ 55 REQUIREMENTS 56 57 58 ------------------------------------------------------------------------------ 59 REFERENCES 60 61 SC 29 Software Copyright Licencing Disclaimer: 62 63 This software module was originally developed by 64 Coding Technologies 65 66 and edited by 67 - 68 69 in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3 70 standards for reference purposes and its performance may not have been 71 optimized. This software module is an implementation of one or more tools as 72 specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards. 73 ISO/IEC gives users free license to this software module or modifications 74 thereof for use in products claiming conformance to audiovisual and 75 image-coding related ITU Recommendations and/or ISO/IEC International 76 Standards. ISO/IEC gives users the same free license to this software module or 77 modifications thereof for research purposes and further ISO/IEC standardisation. 78 Those intending to use this software module in products are advised that its 79 use may infringe existing patents. ISO/IEC have no liability for use of this 80 software module or modifications thereof. Copyright is not released for 81 products that do not conform to audiovisual and image-coding related ITU 82 Recommendations and/or ISO/IEC International Standards. 83 The original developer retains full right to modify and use the code for its 84 own purpose, assign or donate the code to a third party and to inhibit third 85 parties from using the code for products that do not conform to audiovisual and 86 image-coding related ITU Recommendations and/or ISO/IEC International Standards. 87 This copyright notice must be included in all copies or derivative works. 88 Copyright (c) ISO/IEC 2003. 89 90 ------------------------------------------------------------------------------ 91 PSEUDO-CODE 92 93 ------------------------------------------------------------------------------ 94 */ 95 96 97 /*---------------------------------------------------------------------------- 98 ; INCLUDES 99 ----------------------------------------------------------------------------*/ 100 101 #ifdef AAC_PLUS 102 103 #ifdef PARAMETRICSTEREO 104 105 #include "s_hybrid.h" 106 #include "ps_hybrid_synthesis.h" 107 108 /*---------------------------------------------------------------------------- 109 ; MACROS 110 ; Define module specific macros here 111 ----------------------------------------------------------------------------*/ 112 113 114 /*---------------------------------------------------------------------------- 115 ; DEFINES 116 ; Include all pre-processor statements here. Include conditional 117 ; compile variables also. 118 ----------------------------------------------------------------------------*/ 119 #ifndef min 120 #define min(a, b) ((a) < (b) ? (a) : (b)) 121 #endif 122 123 /*---------------------------------------------------------------------------- 124 ; LOCAL FUNCTION DEFINITIONS 125 ; Function Prototype declaration 126 ----------------------------------------------------------------------------*/ 127 128 /*---------------------------------------------------------------------------- 129 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 130 ; Variable declaration - defined here and used outside this module 131 ----------------------------------------------------------------------------*/ 132 133 134 /*---------------------------------------------------------------------------- 135 ; EXTERNAL FUNCTION REFERENCES 136 ; Declare functions defined elsewhere and referenced in this module 137 ----------------------------------------------------------------------------*/ 138 139 140 /*---------------------------------------------------------------------------- 141 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 142 ; Declare variables used in this module but defined elsewhere 143 ----------------------------------------------------------------------------*/ 144 145 146 /*---------------------------------------------------------------------------- 147 ; FUNCTION CODE 148 ----------------------------------------------------------------------------*/ 149 void ps_hybrid_synthesis(const Int32 *mHybridReal, 150 const Int32 *mHybridImag, 151 Int32 *mQmfReal, 152 Int32 *mQmfImag, 153 HYBRID *hHybrid) 154 { 155 Int32 k; 156 Int32 band; 157 HYBRID_RES hybridRes; 158 159 Int32 real; 160 Int32 imag; 161 Int32 *ptr_mQmfReal = mQmfReal; 162 Int32 *ptr_mQmfImag = mQmfImag; 163 const Int32 *ptr_mHybrid_Re = mHybridReal; 164 const Int32 *ptr_mHybrid_Im = mHybridImag; 165 166 for (band = 0; band < hHybrid->nQmfBands; band++) 167 { 168 hybridRes = (HYBRID_RES)(min(hHybrid->pResolution[band], 6) - 2); 169 170 real = *(ptr_mHybrid_Re++); 171 real += *(ptr_mHybrid_Re++); 172 imag = *(ptr_mHybrid_Im++); 173 imag += *(ptr_mHybrid_Im++); 174 175 for (k = (hybridRes >> 1); k != 0; k--) /* hybridRes = { 2,4,6 } */ 176 { 177 real += *(ptr_mHybrid_Re++); 178 real += *(ptr_mHybrid_Re++); 179 imag += *(ptr_mHybrid_Im++); 180 imag += *(ptr_mHybrid_Im++); 181 } 182 183 *(ptr_mQmfReal++) = real; 184 *(ptr_mQmfImag++) = imag; 185 } 186 } 187 188 #endif 189 190 191 #endif 192 193
